The method of voltage regulation under load and device for its implementation

 

(57) Abstract:

The invention can be used for broadband and marketopening contactless voltage regulation under load with only one feeding two-winding transformer for a group of power consumers, which in the regulation of the voltage value of power consumption or current should remain constant. In the characteristic of the proposed method of regulating voltage due to the change of the secondary winding of the transformer and thyristor modules specified new selection condition averages range control voltage at the terminals of the individual receivers of the group and the methods of changing values of the ranges of voltage regulation between the maximum and minimum values. A device that implements the proposed method, provides a control voltage simultaneously at the terminals of the groups of power consumers on individual laws for each receiver of the group through the various options to change the secondary windings of transformers transformer and thyristor modules and accounting control signals produced by the functional bloonsky result - reduction of consumption of active materials, as well as reduced electricity losses in the elements of the power circuit. 2 C. p. F.-ly, 9 Il.

The invention relates to power electronics and electrical engineering and can be used for broadband and marketopening voltage regulation under load.

To regulate the voltage under load is widely known method of mechanical switching of taps of the regulating winding of the transformer with a gap arc current load in oil or vacuum (see Porudominsky centuries of Transformer and reactor equipment for voltage control and reactive power. - Moscow: VINITI, 1984, S. 10-12).

The known method is characterized by the high cost of active materials and high operational costs due to the increased elektroosmosom mechanical contacts, the need for periodic revision of mechanical devices because of the change of worn contacts, dirty oil, as well as poor performance.

To regulate the voltage under load is a known method of non-contact voltage regulation based on the use of transformer and thyristor converters (see the one who. 98-200).

The known method requires high cost of active materials for the manufacture of transformers and a wide range of current thyristor switch in communication with the connection of the primary winding of the transformer through a complex scheme of "counter zigzag".

There is a method of voltage regulation under load, whereby the circuit between the terminals of the secondary winding of the supply transformer and the terminals of the receiving terminals form the incremental voltage by switching thyristor switch and change the circuit connections of the windings of the transformers series-connected transformer and thyristor modules, the voltage at the terminals of the secondary winding of the supply transformer is chosen equal to the middle of the regulation range of the voltage at the terminals of the receiving terminals, and the amount of the maximum voltage levels on the outputs of all transformer and thyristor modules chosen equal to half the above-mentioned range (see the patent of Russia No. 2119229, CL H 02 M 5/12,0 05 F 1/253, 1998 - /prototype/).

A device for regulating the voltage under load, containing matching (input) double-winding transformer, the primary winding of which is attached to the Mnichov included chain, containing a serial connection of n primary windings (where, n=1, 2, . ..) transformers, respectively, "n" transformer and thyristor modules thyristor blocks of keys and functional unit generating signals on the voltage magnitude and phase angle of the load and is included in the system software to control the device output terminals through which blocks of output stages connected to the control electrode of the thyristor keys transformer and thyristor modules (see the patent of Russia No. 2119229, CL H 02 M 5/12, G 05 F 1/253, 1998 /prototype/).

The known method and device do not provide extensive functionality for conservation at a given level of electrical power taken from the output terminals of the device when the voltage regulator is in the direction of its reduction, cost of active materials for the manufacture of the device and lead to high energy losses in the elements of the device during its operation. This is due to three basic reasons. One of them is the fact that known device reducing a voltage at its output terminals must proportionately reduce the electric power load, which peredaete above the nominal value and the last to leave the building. Another reason is that in the known device supply two-winding transformer is used to supply only one or a limited number of receivers that can be connected in parallel. Therefore, the specific consumption of active materials for the manufacture of the transformer and the loss of electricity in its windings during operation increase. The third reason is the lack of the known device compared to the claimed technical solution of the optimal control values of the voltage levels at the terminals of individual power consumers within groups at different time intervals. It is not possible to provide a minimum of energy losses in the elements of the device and the minimum cost of active materials for the manufacture of transformer equipment devices in General. In addition, the known device, the terminals of the secondary windings of all transformers transformer and thyristor modules connected directly to the terminals of the supply network. The level of the supply voltage is 10 kV and above. Without using a step-down transformer to perform the thyristor at such a high level naprawa, consequently, the loss of electricity in his elements significantly increase. For example, using a known device for regulating a voltage in the range 0-100% of its nominal value and while maintaining at a constant nominal level values received from the terminals of the device electrical power, at least for the range of 25-100% of the regulation voltage, leads to an increase in overall power transformer equipment of the known device in comparison with the above-mentioned electric power more than five times. Another example of the use of a known device for regulating the voltage in the range 0-100% from the nominal value and while maintaining at a constant nominal level consumed by the receivers of the current) results in an increase in overall power transformer equipment of the known device compared to most electric power consumption by more than 1.5 times.

Object of the invention is to enhance the functionality of the method of voltage regulation under load and reduction of consumption of active materials for the manufacture of the device for its realization.

The technical result bookmark the La power supply and control voltage simultaneously at the terminals of the group of loads on individual laws for each receiver group. More than half reduced consumption of active materials and the cost of manufacturing the transformer hardware, and operational costs when using it.

This technical result is achieved in that in the method of voltage regulation under load, whereby the circuit between the terminals of the secondary winding of the supply transformer and the terminals of the receiving terminals form the incremental voltage by switching thyristor switch and change the circuit connections of the windings of the transformers series-connected transformer and thyristor modules, the voltage at the terminals of the secondary winding of the supply transformer is chosen equal to the middle of the regulation range of the voltage at the terminals of the receiving terminals, and the amount of the maximum voltage levels on the outputs of all transformer and thyristor modules chosen equal to half the above-mentioned range, according to the invention for a group of receivers of the mid-range of the regulation voltage at the terminals of the individual receivers of the group choose the same level equal to the voltage at the terminals of the secondary winding of the supply transformer, changing the elegance and minimum values of these voltages by changing the maximum amount of voltage levels on the outputs of all transformer and thyristor modules, included consistently in the circuit of this receiver group, for the part of the group of loads where the voltage regulator is the input current remains unchanged, the change in the voltage at the terminals of the receivers of this part of the group so that at any time the ratio of the sum of the voltages at their terminals to the number of simultaneously operating receivers of this part of the group was equal to or close to the value of the selected voltage level equal to the mid range of its regulation, and for another part of the group of loads where the voltage regulation value of the consumed power should remain unchanged, ensures reduction of the currents in the windings of the supply transformer by the switching of inter-thyristor keys windings of the transformers series-connected transformer and thyristor modules with a consonant inclusion on the counter or Vice versa.

This technical result is also achieved by the fact that in the known device for regulating the voltage under load containing feed two-winding transformer, the primary winding of which is connected the nicknames included chain, containing a serial connection of n primary windings (where n=1,2, ...) transformers, respectively, "n" blocks thyristor switch and a function block (Block 15 of Fig. 1 schematic of the device prototype) that produce signals on the voltage magnitude and phase angle of the load and is included with the processor, the program control device, the output of which is through the blocks of output stages connected to the control electrode of the thyristor keys transformer and thyristor modules, according to the invention when creating a schema simultaneous power group power with additional circuits similar to those described above, the terminals of the secondary winding feeding the two-winding transformer connected to respective terminals of each of the receivers of the group, and the clamps and the taps of the secondary windings of all transformers transformer and thyristor modules via the thyristor is connected with the possibility of switching between them, or counter-consonant relative to the respective primary windings of these transformers and their parallel connection to the output terminals of the secondary winding feeding the two-winding transformer, and a functional block of the system information about the magnitude of the phase angle of the load, and the values of voltage, current and active power, while the number of functional units is increased to the number connected to the power receiving terminals, and the number of output stages of the program control system is selected corresponding to the number of transformer and thyristor modules.

The claimed method group supply multiple receiving terminals from the output terminals of the same two-winding transformer while maintaining the possibility of wide-range and marketopening regulation voltage at the terminals of each receiver of the group on individual laws, as well as the requested connection diagram terminals and taps of the secondary windings of all transformers transformer and thyristor modules to the output terminals referred to supply two-winding transformer contribute to the solution of problems of resource and energy saving in the organization of voltage regulation under load, as during its implementation more than half reduced consumption of active materials and the cost of manufacturing the transformer equipment device, as well as twice the decrease of energy losses in his elements during the operation of the prototype allowed to establish their compliance with the criterion of "Novelty". The study of other known technical solutions in this area the features distinguishing the claimed invention from the prototype, were not identified, and therefore they comply with the criterion of "Inventive step". The tests confirm compliance with the criterion "Industrial applicability".

In Fig. 1 is a diagram of one embodiment of the device, containing in its structure a group of receivers that receive the electric power from the device for implementing the method of voltage regulation under load as an example in Fig. 1 shows a group containing in its composition two receiver of Fig. 2 - variant schematic diagram of one of the transformer and thyristor modules device in accordance with the proposed method, Fig. 3 - vector topographic chart illustrating the process of regulation of the load voltage according to the proposed method, Fig. 4 is a timing diagram of the voltage at the terminals of the individual receivers of the group, explaining the process of optimal control the operation of the device in accordance with one variant of the proposed method. Fig 5-8 shows the circuit connection of the secondary obmol algorithm works program control system according to the proposed method.

The device (Fig. 1) contains supply two-winding transformer with 1 primary 2 and secondary 3 windings, between the output terminals a1b1c1the secondary winding 3 of the supply transformer 1 and the input terminals of each of the receiving terminals 4 and 5 in series between an enabled primary winding respectively 6, 7 and 8, 9 transformers 10, 11 and 12, 13 of the respective transformer and thyristor modules. Version full circuit performance transformer and thyristor module of Fig. 1 is limited by the dotted line 1 and depicted in Fig. 2. The clamps and the taps of the secondary windings 14, 15 and 16, 17 respectively of the transformers 10, 11 and 12, 13 of these modules through the thyristor corresponding blocks 18, 19 and 20, 21 are connected to the output terminals a1b1c1the secondary winding 3 of the supply transformer 1. Schematic diagrams of all thyristor switch device are the same, and in the example of Fig. 2 by the dashed line allocated schematic diagram of one of the variants of the thyristor key block 18 (item 18.1). As an active element (thyristor switch) can be used instead of thyristors other technically equivalent by function program control device 22 (highlighted by the dashed line) contains a block of permanent storage devices 22.1, the processor unit 22.2, blocks 23, 24 (functional) that act as sensors of phase, voltage, current and power, the control unit 25 and blocks the output stages 26, 27, 28, 29, according to the number of used transformer and thyristor modules. To connect the mains supply to the unit are terminals a, b, C. the Blocks 23, 24 generate signals carrying the information about the phase angles of the load power, and the values of voltage, current and power at their terminals. The blocks 26, 27 and 28, 29 produce control pulses, with which close and open certain thyristor switches for changing the circuit connections of the secondary windings of the transformers 6, 7 and 8, 9. The algorithm works program control system is illustrated in the process of describing the principle of operation of the device.

In Fig. 2 shows a variant of the schematic circuit of one of the transformer and thyristor modules, which explains the commutation of the windings of the transformers 10, 11 and 12, 13. Fig. 2 is a fragment of Fig. 1, a dotted line 1. By incorporating certain thyristor switch blocks 18, 19 and 20, 21 clamps and bends the corresponding secondary winding connect the various options, both among themselves and to the clamps vtcsut several groups. Certain thyristor 18.1, 18.3, 18.5, 18.8, 18.10, 18.12 block 18 of the first group include when you want to reduce some discrete value of the voltage on output terminals a2b2c2compared with its value at the input terminals a1b1c1transformer and thyristor module. When you want to increase the voltage at the terminals of a2b2c2then include a thyristor, for example 18.2, 18.4, 18.6, 18.7, 18.9, 18.11 unit 18 from the second part of their group. Thyristor 18.13, 18.14, 18.15, 18.16, 18.17, 18.18 the third group is used for connection between the terminals and taps of the secondary winding with the aim of obtaining various options schemes of its compounds. In the particular case when there is no need to change the voltage on output terminals a2b2c2transformer and thyristor module relative to that of the input terminals a1b1c1it then include certain thyristor exclusively from their part of the third group. A schematic diagram of one embodiment of a thyristor keys shown by the dashed line position 18.1). The input terminals of each of the receiving terminals 4 and 5 is indicated in Fig. 1 sootvetsvujushchie chart which correspond to different polnovesnym modes transformer and thyristor modules. According Fig. 3 may 9 polnovesnykh modes, which are shown in Fig. 3 conditional name "Mode 1, Mode 2, ... , Mode 9". To support these modes of operation in accordance with Fig. 2 includes certain thyristor switches from different groups. For example, the mode of operation, codenamed "Mode 1" is produced by switching on the thyristor keys 18.13, 18.14, 18.17, 18.18 exclusively from the third group. Such modes Mode 2, Mode 3, . .. , Mode 5" is provided through the use of part of the thyristor switches from the first and third groups. Other modes Mode 6, Mode 7, ... , Mode 9" obtained by incorporating some of the thyristor keys of the composition of the second and third groups. Specific non thyristor switch for providing the above-mentioned polnovesnykh modes transformer and thyristor modules shown in Fig. 3. Analysis of different chart modes shows the increase or decrease of the output voltage, for example a linear voltage Ua2b2relative to the corresponding input line voltage Ua1b1almost equal speed. According Fig. 1 between the input sagi the UB> winding 3 of the supply transformer 1 is connected in series two transformer and thyristor module. Therefore, the device allows you to get 99=81 level three-phase voltage at the terminals of each receiver in the group. Regulate the voltage within 0-100% from the nominal value in small steps amount of about 1.25%. If the receiver, for example an electrolytic cell for obtaining non-ferrous metal, requires power supply DC, the number of levels of DC voltage at its terminals several times increase. For this purpose, the input terminals of rectifier bridges, from which they receive electricity mentioned electrolytic serves adjustable magnitude AC voltage not only due to the use of the above polnovesnykh modes. In addition, using a large number (set 63 such mode) unbalanced modes transformer and thyristor modules. The last implemented by selecting different options (63 pieces) unbalanced connection of the secondary winding 14 or 15, 16 or 17 of the transformer 10 or 11, 12 or 13, respectively, to the output terminals of the winding 3 of the supply transformer 1.

In Fig. 4 as primerov, who in their group receive energy simultaneously from the terminal a1b1c1the proposed technical solutions. The change in the voltage at the terminals of each of the receivers for the cycle time (tC) taken on the same linear law within 0-100% from the nominal value (0-Umax- Fig. 4). In Fig. 4 the graphical dependence of I, II, III, and IV are given on the interval time changes a little more than two tC. The analysis of Fig. 4 shows that the shift of temporal moments of the beginning and end of the same cycles of change of voltage at the terminals of the individual receivers of the group at the same time provides for any moment of time (t1- Fig. 4) equality relations of the sum of the voltage (UI+UII+UIII+UIV- Fig.4) at their terminals to the number of simultaneous receivers of the group the value of the voltage (U0- Fig. 4), corresponding to the middle of the range of its regulation.

In Fig. 5-8 is shown illustrating the operation algorithm of the program control system schematic diagrams of Fig. 5 and Fig. 7 of the secondary winding 14,15-17 transformers respectively 10,11-13, and corresponding timelines Fig. 6 and Fig. 8 zones e the above-mentioned circuit of the secondary winding by incorporating certain thyristor switch. As an example, consider one of the variants of the two-step algorithm switching time of the thyristor keys that lets you take the device out of operation with the code name "Mode 1" in the other stationary regime with the conditional name "Mode 2" (Fig. 3). Schematic diagram of Fig. 5 and the graph in Fig. 6 correspond to the first stage of the algorithm, and the diagram in Fig. 7 and the graph in Fig. 8 - the second stage of the algorithm switching. Analysis of the graphs of Fig. 6 and Fig. 8 allows to conclude that the width of the time zones natural commutation turn off thyristor switch, as well as their location in time significantly depend on the phase shiftn- El.gr.) between current and voltage at the terminals of the receiving terminals. For example, to power a purely resistive naturen= 0 El.gr.) area natural commutation turn off thyristor key 18.18 (Fig. 5) at the first stage is in the range from 60 El.gr. 150 e.gr. in the positive and negative half cycles of voltage of phase a, which is taken as a base when building a program control system. For the second phase, when off thyristor key 18.17 (Fig. 7), this zone varies and is within ouida program control device according to the following procedure. Whennequal or close to zero electrical degrees (-15 El.gr. n+15 e.gr.) in the time after 90 El.gr. (QEC=90 El.gr.) after the next transition of the voltage of phase a at the terminals of the corresponding receiver through the zero value, the processor unit 22.2 removes the control pulses to the thyristor key 18.18. At the same time it delivers control pulses to the other two thyristor key 18.10 and 18.12. Within a few microseconds, a rapid decrease in the current icin the circuit of the thyristor key 18.18 to zero and it shuts down. However, over-current and voltage components of the device are not happening at this first stage of the algorithm switching ends. Next, after another 60 e.gr. after the start of the first phase (QEC=150 El. gr.) begins the second phase of the algorithm. Similarly, removed the control pulses to the thyristor key 18.17 and simultaneously serves the control pulses for thyristor key 18.18. There is a rapid decrease in the currentandin the circuit of the thyristor key 18.17 to zero and it shuts down. When this device is in the new stationary mode of operation, codenamed "Mode 2" (Fig. 3). A possible change in the character n is ITMA in the form of tables and store it in a persistent storage device 22.1 program control system 22.

In Fig. 9 shows a variant of the schematic functional block 23, which explains his device and his function. Fig. 4 represents the fragments of Fig. 1, which are highlighted by dashed lines (items 23, 24). By switching between the respective input and'3b'3with'3and output a3b3c3the clamp block 23 of the primary winding of the current transformer 23.1 receive a signal about the value of the instantaneous power of the receiver 4 of the current i. This signal is taken from the terminals of the secondary winding of the current transformer 23.1 and is fed to the input of the inverter 23.3. In addition, the input terminals of the Converter 23.3 signal from the secondary winding of the transformer voltage 23.2. This signal corresponds to the instantaneous value of the voltage at the input terminals of the receiver 4. Converter 23.3, using as input data the instantaneous values of current and voltage (i and u), generates signals in accordance with the following functional dependencies F:

F{U=F1(u);n=F2(u,i); I=F3(i): P=F4(U,I)}.

The signals indicating the values of the effective values of voltage U and current I, and the values of the phase anglenand pot

Their purpose is explained in the description of the operation principle of the device. The need for resource and energy efficiency in the organization wide and marketopening regulation voltage under load at the terminals of a separate power leads to the necessity of organization of group schemes of power from the same supply transformer 1 multiple receiving terminals 4 and 5 (Fig. 1). When the voltage regulation within the time cycle changes (tC- Fig. 4) with any, even the most wide range 0-100% regulation shift the times of looping of the regulation voltage at the terminals of the individual receivers of the group so that at any time the ratio of the sum of the voltages at their terminals to the number of simultaneously operating receivers of the group was close to the value of the selected voltage level corresponding to the middle of its control range (U0- Fig. 4). In the claimed technical solution is implemented using program control system 22 by affecting certain thyristor blocks 18, 19 and 20, 21 in the various circuits of the receiving terminals 4 and 5. In the known device to implement lastly the wider public, than in the known device.

The method is as follows. Let in the original mode, after switching the device into the mains level voltage on output terminals of the winding 3 of the supply transformer 1 is a certain value U0(Fig. 4). This voltage is the same and equal to the mid range of its regulation at the terminals of the individual receiving terminals 4 and 5 of their group. Thus, the composition of the thyristor switch blocks 18 and 19 are included thyristor switches with the same numbers respectively 18.2, 18.4, 18.6, 18.15, 18.16 (Fig. 2), etc. - key unit 19. But in the thyristor switch units 20 and 21 on the other thyristor switches with corresponding numbers. Transformer and thyristor modules, which are connected in series in the circuit of the receiver 4 are in operation, codenamed "Mode 9" (Fig. 3). The modules are connected in series in the circuit of the receiver 5, we work with the conditional name "Mode 5" (Fig. 3). The source voltage level at the input terminals of the receiver 4 is equal to its maximum value, as the total maximum voltage level at the terminals of the primary windings 6 and 7 (U6,7 maxboth modules is half diapam 3 supply transformer 1. At the input terminals of the receiver 5, the source voltage is assumed equal to its minimum value, as the total maximum voltage level at the terminals of the primary windings 8 and 9 (U8,9 maxboth modules is half of the control range of the voltage at the terminals of the receiver 5 and is out of phase with the voltage U0winding 3 of the supply transformer 1. The adjustment ranges of the voltage at the terminals of the individual receiving terminals 4 and 5 are respectively equal to U0U6,7 maxand U0U8,9 max. The last may be the same or different as the largest and temporary law changes in voltage within the range of its regulation. After the implementation of the transfer program control transformer and thyristor modules in the operating modes, which are different from the above, the device is in a new steady state. This mode differs from the previous level voltage up or down on the clamps of one (or more) of the receiver(s) of their group, or simultaneously at the terminals of all the receivers of the group one (few) step(s) of voltage regulation. The value of the same degree of reguline regulation U0+U6,7 maxat the terminals of the receiver 4 and U0+U8,9 maxat the terminals of the receiver 5, respectively. For example, in the new steady state compared to the original regime changes occurred in the composition included thyristor switch in blocks 19 and 21. These blocks transformer and thyristor modules passed in the operating modes with the conventional names respectively "8" and "Mode 4" (Fig. 3). The voltage at the terminals of the receiver 4 has decreased by one, a certain higher level of regulation, and at the terminals of the receiver 5, it has also increased to a certain higher level. The algorithm works program control system transfer devices in different stationary regimes consider the example of dynamic switching process in time thyristor switch 18.13, 18.14, 18.17, 18.18 "Mode 1" (Fig. 3) thyristor 18.13, 18.14, 18.8, 18.10, 18.12 - "Mode 2" (Fig. 3). On command of the control unit 25 starts the process of switching thyristor switch. Pre-operator in the control unit 25 is placed in the form of tables, information about the temporal laws of change of voltage at the terminals of the individual receivers of the group, as well as tabular data in accordance with Fig. 5-8 by Aya in the processor, namely, in its permanent memory unit 22.1. The processor unit 22.2 reads from block 22.1 necessary digital information about the moments of time in which to change the circuit connections of the secondary windings 14, 15 and (or) 16, 17 transformers transformer and thyristor modules. The latter is connected in series in the circuit of the respective receiving terminals 4 and 5. Block 22.2 monitors the current time and its coincidence with the permitted time begins to implement a phased switching thyristor certain key transformer and thyristor modules. To do this, he first determines the current values of the phase anglesnload current the magnitude of which is received in block 22.2 blocks from sensors 23 and 24 on his team. Then, the controller 22.2 of specific memory cells of the block 22.1 corresponding to specified valuesnreads information about the stages of the algorithm switching thyristor switch for the desired unit from the initial operation mode to another stationary regime. Further, in accordance with the methodology set forth in the description of the data of Fig. 5-8, the processor 22.2 shoots using blocks output stages 26, 27 and (or) 28, 29 impulses, control off supplies control pulses to the thyristor, to be included in the new steady state the specific transformer and thyristor modules and devices in General (see the patent of Russia No. 2113753, CL H 02 J 3/12, H 02 M 5/257, 1998).

Consider one example implementation of the method. According Fig. 4 for groups of four receiving terminals, for example for time t1, the equality (UI+UII+UIII+UIV)/4=U0. The last equality provided by time shift in the direction of lag moments of the beginning and end of the cycles of change of voltage at the terminals of the individual receivers of the groups relative to each other by an amount which is equal to the ratio of cycle time to the number of simultaneously operating receivers of the group. Let us assume that the voltage regulation within the cycle time tCit changes at the terminals of all four receivers running at a constant value of consumed current is equal to the nominal value. Schedules I, II, III and IV change of voltage (Fig. 4) for time t=t1will deliver in accordance with Fig. 3 modes of operation transformer and thyristor modules with the conventional names, respectively, "Mode 2", "4", "Regia in the operating modes with the conventional names "Mode 2" and "Mode 4" reduce by a certain amount current which consume power consumers from winding 3 supply two-winding transformer 1. On the contrary, the currents of the secondary windings of transformers transformer and thyristor modules, which are the modes with the conventional names "Mode 6" and "8" are increasing at the same above-mentioned amount of current, which consume power consumers from winding 3 supply two-winding transformer 1. In this regard, the electrical power supply two-winding transformer 1 is half of the amount of electric power of the entire group of receivers that receive electricity from the transformer 1. Electric power of each receiver of the group determined by the mode with the maximum voltage on the terminals and the above-mentioned nominal current consumption. Electric power transformer and thyristor modules, connected in series in the circuit of each receiver of the group, approximately half of the capacity of the receivers group if the maximum range of the regulation voltage at its terminals within 0-100% according to the schedules I, II, III and IV (Fig. 4).

As another example of the method will accept,by individual power consumers of electric power, for example the same and equal to the rated value (Pn). The voltage at the terminals of the individual receiving terminals 4 and 5 bands (Fig. 1) also govern respectively in the ranges U0U6,7 maxand U0U8,9 max. When the maximum value of the voltage on the primary windings 6, 7 and 8, 9 transformers 11 and 13 of the respective receiving terminals 4 and 5 has a minimum value, which is equal to

I6,7 min=Pn/(U0+U6,7 max); I8,9 min=Pn/(U0+U8,9 max).

Electric power transformers 10, 11 and 12, 13 of the transformer and thyristor modules, which are included in series with the receiving terminals 4 and 5, when this minimum value depends on the range of voltage regulation and are respectively equal to

P10,11 min=[U6,7 max/(U0+U6,7 max)]Pn;

P12,13 min=[U8,9 max/(U0+U8,9 max)]Pn.

The decrease in voltage at the terminals of the receiving terminals 4 and 5 leads to the increase of current in the respective windings of the transformers, and consequently increase the power of their proportional to the ratio (U0+Umax)/(U0-Umax). Electric power transformers 10, 11 and 12, 13 of transformer-shooting the national capacity of these power Pn, the regulation range of the voltage at their terminals and equal

P10,11 max=[U6,7 max/(U0-U6,7 max)]Pn;

P12,13 max=[U8,9 max/(U0-U8,9 max)]Pn.

For windings 2 and 3 two-winding transformer 1, the power supply receiving terminals 4 and 5, the current value is not changed in the process of regulating the voltage at their terminals. Therefore, the electric power supply transformer 1 leave without changes. This is due to the fact that the increase of the currents I6,7and I8,9primary windings of the transformers 10, 11 and 12, 13 when the decrease of the voltage at the terminals of the receiving terminals 4 and 5 is compensated by an equal decrease of the currents in the secondary windings 14, 15 and 16, 17 of these transformers. For example, when reducing the voltage at the terminals of the receiving terminals 4 and 5, respectively, of the values U0+U6,7 maxto U0and U0+U8,9 maxalso to U0the currents in the primary windings 6, 7 and 8, 9 transformers doubled. They constitute the largest accordingly 2I6,7 minand 2I8,9 minif we assume that U0=U6,7 max=U8,9 max. Thus the currents in the secondary windings 14, 15 and 16, 17 are reduced, respectively, of the I14,15= I6,7 min6,7 min+2I8,9 min. The magnitude of this current is not changed by the example of halving the voltage at the terminals of the receiving terminals and is also 2l6,7 min+2l8,9 min. Similarly, when a further decrease in the voltage at the terminals of the receiving terminals up to zero value, the amount of current in the winding 3 of the supply transformer 1 remains unchanged.

The proposed solution allows you to extend the functionality of the method of voltage regulation under load, to reduce the cost of active materials for the manufacture of the device and the costs of its operation to implement the method.

1. The method of voltage regulation under load, whereby the circuit between the terminals of the secondary winding of the supply transformer and the terminals of the receiving terminals form the incremental voltage by switching thyristor switch and change the circuit connections of the windings of the transformers series-connected transformer and thyristor modules, the voltage at the terminals of the secondary winding of the supply transformer is chosen equal to the middle of the regulation range of the voltage at the terminals of the receiving terminals, and the amount of the maximum levels n is on, characterized in that for a group of receivers of the mid-range of the regulation voltage at the terminals of individual power consumers choose on the same level, equal to the voltage at the terminals of the secondary winding of the supply transformer, changing the magnitude of the adjustment ranges of the voltage at the terminals of individual power consumers by changing the maximum amount of voltage levels on the outputs of all transformer and thyristor modules that are included sequentially in the circuit of this receiver group, for the part of the group of loads where the voltage regulator is the input current should remain unchanged, the change in the voltage at the terminals of the receiving terminals so so that at any time the ratio of the sum of the voltages at their terminals to the number of concurrent power was equal or close to the value of the selected voltage level equal to the middle ranges of the regulation on the clips separate collectors, and for another part of the group of power consumers, which in the regulation of the voltage value of the power consumption should remain unchanged, provide switching hive with a consonant inclusion on the counter or Vice versa.

2. Device for regulating the voltage under load containing feed two-winding transformer, the primary winding of which is connected to the mains supply, and between the output terminals of its secondary winding and the respective terminals of the receiving terminals connected in series connected primary windings of the n transformers n respectively transformer and thyristor modules thyristor blocks of keys, where n=1,2, ..., and functional unit generating signals about the value of the phase angle of the load and is included with the processor, the program control device, the output of which is through the blocks of output stages connected to the control electrode of the thyristor keys transformer and thyristor modules, characterized in that when creating a schema simultaneous power group power terminals of the secondary winding feeding the two-winding transformer connected to respective terminals of each of the receiving terminals connected in series through the primary windings of the n transformers n respectively transformer and thyristor modules thyristor blocks of keys, where n=1,2, .. . and the clamps and the taps of the secondary windings of transformers all transforma two-winding transformer with the possibility of switching these windings between a consonant with their inclusion on the counter or Vice versa, and a function block program control system is made with the possibility for additional processor signals, which carry information about the quantities of voltage, current and active power of the load, while the number of functional blocks corresponds to the number of connected receivers, and the number of output stages of the program control system is selected corresponding to the number of transformer and thyristor modules.

 

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Voltage regulator // 2075817

The invention relates to electrical engineering and can be used to regulate or stabilize the three-phase voltage without distorting the phase of the first harmonic component

The invention relates to electrical engineering and can be used for non-contact voltage regulation under load

FIELD: electric engineering.

SUBSTANCE: method for stabilization and adjustment of current value or voltage value at clamps of electric plants power systems by direct current, which provides for absence of higher harmonic curves in current, consumed from power grid, is implemented by a device, which, in accordance to method, allows to use for broadband, low-step and noncontact adjustment of value of rectified voltage great number of combinations of different operation modes of minimal number of transformer-thyristor modules. For any combination of operation modes of said modules exception of higher harmonic curves from composition of consumed electric current is automatically provided for. Use of three fully controlled electric keys (one for each phase) in device, and also systems for software control thereof with functional elements for direct and reversed fast Fourier transformations, allows to replace converting transformer with common network one in power systems for electric plants, and to decrease number of used converting transformers.

EFFECT: lower costs, lower losses, higher compatibility.

3 cl, 10 dwg

FIELD: electric engineering, in particular, systems for stabilizing current of powerful transforming substations of aluminum industry.

SUBSTANCE: in accordance to invention, in device for stabilizing current of powerful transforming substation, which device contains at three-phased volt-adding transformer, having at least two windings, reactive elements, represented by three-phased resonance reactor and three one-phased capacitor plants; three-phased auto-transformer, containing at least two windings, to one of which at least one of reactive elements is connected; phase windings of first winding of three-phased volt-adding transformer, phase windings of three-phased resonance reactor and one-phased capacitor plants are connected in form of tree Y-networks; phase windings of second winding of three-phased volt-adding transformer are connected to supply net and to load, it is proposed to introduce at least one additional phase-shifting winding, beginning of each one of phase windings of which is connected to supply net, and its end is connected to at least one winding of another phase of another winding of auto-transformer; also, in device for stabilizing current of powerful transformer substation auto-transformer may contain at least one voltage control switch; at least one of auto-transformer windings may contain control sections, connected to at least one of reactive elements, and to introduced voltage control switch; also, current stabilizing device for powerful transforming substation may contain at least one controllable three-phased reactor, while an additional winding, connected to introduced controllable three-phased reactor, may be introduced to auto-transformer.

EFFECT: creation of device for stabilizing current of powerful transforming substation, having optimal mass-dimensional characteristics, decreased manufacturing costs, and also decreased level of electric losses.

2 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: in the mains voltage control unit the transformer primary winding connected through the reverse polarity switch with the adjusting winding (secondary winding) of the transformer and placed with it on the same magnetic conductor is installed in the device with a possibility of interaction with the winding of the voltage measuring transformer connected to the electric drive-connected controller. The device contains two additional regulators which are identical with the first one. Regulators are connected to the three-phase voltage network with formation of the connection circuit designed as a full triangle as it is indicated in the application materials.

EFFECT: improved reliability.

2 dwg

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and power engineering, specifically to devices for controlling voltage and power transmitted in electric AC distribution networks. Device comprises a first power transformer without a device for controlling load voltage; second power booster transformer with device for controlling load voltage on secondary winding; three-phase uncontrolled rectifier; capacitor; first and second three-phase inverters; first and second measuring voltage transformers; measuring current transformer; voltage measurement unit; power measurement unit; first and second control units; logic unit; third feed power transformer with device for controlling load voltage on primary winding; unit for controlling device for controlling load voltage of transformer; unit of thyristor commutator, unit for synchronisation of voltage control; unit for controlling device for controlling load voltage of booster transformer.

EFFECT: high efficiency of controlling level and duration of voltage deviation, as well as increased grid power ratio.

1 cl, 1 dwg

FIELD: electrical engineering; fast-response and high-precision ac voltage regulators.

SUBSTANCE: proposed ac voltage regulation device has input and output leads; common point; first transformer that has main winding connected between input lead and common point of device and sectionalized winding whose taps are connected to respective inputs of controlled switch; second transformer whose secondary winding is connected between input and output leads of device; controlled phase shifter interconnecting second transformer primary winding, controlled switch output, and common point; first transformer functions to step up voltage by minimum two times of its regulation range and second transformer is used to accordingly step down this voltage.

EFFECT: reduced value of handled currents.

5 cl, 2 dwg

FIELD: electrical engineering; variable-voltage regulating devices.

SUBSTANCE: proposed variable-voltage stepping regulator whose output voltage is much higher (by 1.5 times or more) than input value is designed to maintain output voltage within desired (usually as short as, for instance, ±1%) with input voltage varying within much wider range (±10%) has input and output leads, main step-down or step-up transformer or autotransformer, tap changer of this transformer primary winding, and booster transformer whose primary winding is connected through its one lead to tap changer and secondary winding is connected to first input lead; one of main-transformer primary winding leads is connected to second input lead; tap changer functions to connect booster transformer primary winding to entire primary winding of main transformer or to its part; booster transformer primary winding is inserted between first input lead and primary winding of main transformer; second lead of booster-transformer primary winding is also connected to tap changer whose switching algorithm implies connection of booster-transformer primary winding to entire main-transformer primary winding and to its part both in phase and in phase opposition with respect to input voltage, as well as its shorting out.

EFFECT: simplified design, reduced mass, size, and cost, enlarged functional capabilities of regulator.

1 cl, 2 dwg

FIELD: physics.

SUBSTANCE: alternate voltage controller includes discrete adjusting element connected between input and output, analog-to-digital converter with input connected to control signal outputs, counter, locking pulse shaper with input connected to device inputs and output connected to zero counter setting input, code converter with input connected to counter output, 'log.0' signal generator, adder with first input connected to high orders of analog-to-digital converter and output connected to control inputs of discrete adjusting element, and comparator with first input connected to low order output of analog-to-digital converter, second input connected to code converter output and output connected to low order input of second adder, high order of which is connected to 'log.0' signal generator output. Additionally the controller features cascade of rectifier with input connected to device outputs and voltage-controlled generator with output connected to counter input.

EFFECT: improved adjustment regularity of industrial power network with distorted voltage type.

5 dwg

Voltage regulator // 2346318

FIELD: electricity.

SUBSTANCE: voltage regulator model proposed is an invention referring to the sphere of electrical engineering. Device contains input and output terminals, a sensor of input main voltage and a transformer, the latter's primary coil connected to the first diagonal of a bridge circuit composed of four normally open adjustable alternating current switches; the transformer secondary coil is serially connected to the load circuit with an adjustable alternating current switch connected parallel to it. The control alternating current switches are controlled via three-position comparator units. There are time delay elements inserted in the "more" and "less" control output signals circuit of the three-position comparator unit that enable synchronisation of the transformer primary coil connection and secondary coil bridging with the upper and the lower voltage setup units connected to the "Higher Voltage" and the "Lower Voltage" outputs of the three-position comparator unit accordingly.

EFFECT: simplification of design combined with extension of functional capabilities, minimisation of weight and overall dimensions, rejection of noise generated by the device and maintenance of the consumer end voltage harmonicity under major supply voltage fluctuations.

1 dwg

FIELD: electricity.

SUBSTANCE: improved efficiency of method implementation is achieved due to multi-phase system balancing against specified phase, or phase with load current close to mean current, or less loaded phase defined as reference phase. By the method, balancing is implemented by generation of pre-formed currents by means of additional power source in each of remaining (n-1) phases, so that in each balanced (n-1) phase of the main n-phase network, the geometrical sum of currents generated in balanced phase and with load current is equal modulo to current in reference phase, and angle formed by the current of reference phase and total current of balanced phase following the reference phase at forward sequence of phases, as well as between total currents of neighbouring (n-1) balanced phases is equal to electrical degrees.

EFFECT: improved efficiency of multi-phase system balancing due to increased response and simplified implementation, extended application sphere, improved economy.

1 dwg

FIELD: electricity.

SUBSTANCE: invention may be used to control or stabilise voltage of power and converting transformers, in particular for supply of individual loads in networks with unstable parametres. It is proposed to control voltage alternately in zones of current and voltage match and non-match. Besides voltage should be reduced first in zones of current and voltage signs match by increasing switching angle and second in zones of current and voltage signs non-match by reducing switching angle, and pressure increase shall be executed in reverse order.

EFFECT: expanded range of control in case of active-inductive, active-capacitance and recuperative loads, and in idle running of transformer.

3 dwg

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