Five-phase phase changer
SUBSTANCE: invention may be used to create rectifiers for controlled electric DC and AC drives for machines to increase their efficiency, and also on transformation substations for power supply to electrified railway roads, in electric metallurgical and chemical industry to reduce the value of pulsations of rectified voltage and to reduce content of higher harmonic components in an AC curve in a three-phase grid. The proposed five-phase phase changer comprises a three-phase transformer, having three coils of the primary winding, which are connected as a star network, and are connected to the three-phase grid with a zero wire "0", six joined main coils of the secondary windings, one additional coil of secondary winding and taps from turns of the main coils of the secondary windings, which jointly with the output clamp of the additional coil of the secondary winding create a symmetrical five-phase system of voltages. Each main coil of the secondary winding of the transformer is a side of a "hexagon" A, B, C, D, E, F, transforming a symmetrical three-phase system of voltages into a symmetrical six-phase system of voltages, at the same time the additional coil of the secondary winding with its beginning is connected to the unit of the "hexagon" circuit, which is not connected with the main coils of the secondary winding of the phase, on the rod of which there is the additional coil of the secondary winding.
EFFECT: reduced consumption of active materials during replacement of a three-phase group transformer with a three-rod one, improved weight and dimensional indices of a converter, simplified design of a converter and technology of its manufacturing.
The invention relates to a Converter equipment and can be used to create controlled rectifiers for electric DC and AC machines to improve their performance, as well as on the inverter substations to power electrified Railways, electrical and metallurgical and chemical industries to reduce the magnitude of the rectified voltage ripples and reduce the content of higher harmonic components in the curve of the alternating current in three-phase network.
The prior art converters three-phase AC voltage in the five-phase-based transformers Scott (Varfolomeev G.N., Mutiny SV, Shurov NI five-phase bridge rectifier Assembly-based schema Scott /journal of KSTU, Transport, VIP Krasnoyarsk: Publishing house. KSTU, 2005, p.21-25/).
A disadvantage of the known probes is a complex circuit of the transformer, due to the need to obtain a corresponding shift of the secondary phase voltages.
The prior art also multi-phase inverter three-phase AC voltage to DC, containing a three-phase transformer with primary and two groups of secondary windings connected in a "zigzag". The transformer is provided with an additional group W is the hexadecimal format of the windings (Casekow "power Sources. Multi-phase power transformers-converters and rectifiers" /Power electronics No. 4, 2006, p.7-15/).
A disadvantage of this device is more of the secondary winding, which greatly complicates the design of the Converter, the technology of its production and leads to waste of materials.
The closest technical solution to the proposed Converter is a Converter consisting of three single-phase transformers, each containing one primary winding and five secondary windings (Varfolomeev GN. and other Review circuitry of the converters of the number of phases on the transformers. Improvement of technical means of electric vehicles. /Collection of scientific works. Issue 2. Novosibirsk, 2001, p.78-96/). Thus, to implement the required three-phase, three-phase transformer, the primary winding of which is connected to a three-phase network with zero wire 0 in one of the schemes: "star" or "triangle" and five secondary windings of each phase transformer (fifteen in all three phases). A disadvantage of this device is the fact that a group of three-phase transformer is inferior to the three-phase three transformer according to its weight and size parameters, as well as the Converter has a large number of secondary windings, which significantly enhanced great design of the Converter, the technology of its production, leading to waste materials and increase the cost.
The technical result of the claimed invention is to create an architecture of the Converter, which allows to reduce the consumption of active materials when replacing a three-phase group of the transformer is three with a smaller number of secondary windings, which ultimately helps to improve the weight / size performance of the Converter, to simplify the design of the Converter, the technology of its production and reduce the cost.
The technical result is achieved owing to the fact that the five-phase inverter of the number of phases, representing a three-phase transformer comprising three coils of the primary winding and the seven coils of the secondary winding to the outputs of the five-phase voltage, according to the invention, the six coils of the secondary winding is made in the form of the main coils of the secondary winding two at each terminal of the transformer, and one additional coil secondary winding located on the core of the transformer, which are the two primary coils of the secondary winding made with tap positions, dividing the number of turns of each of the coils in relation to (1-Tg600Tg180):(1+Tg600Tg180from the beginning of the coil, and the other two main coils of the secondary winding is made with what Tanami, dividing the number of turns of these coils in the ratio (1+Tg600Sin60/Sin720):(1-Tg600Sin60/Sin720from the beginning of the coil, and with taps from the other two primary coils of the secondary winding and the output of the additional coil secondary winding are the outputs of the five-phase system of voltages of the Converter, in addition, all primary coil secondary winding interconnected nodes in a single path in the form of "hexagon" so that the voltage between nodes form a six-phase system voltage, in this case, an additional coil secondary winding your beginning connected to the node of circuit "hexagon", which is not associated with the main coils of the secondary winding of the phase, on the rod which is additional coil secondary winding.
The invention is illustrated graphic materials, in which figure 1 presents the scheme of the five-phase inverter of the number of phases, figure 2 is a vector diagram of the potentials on the windings and taps from the turns of the secondary winding.
Five-phase inverter of the number of phases consists of a three-phase transformer having three primary coil windings: a primary winding coil 1, coil 2 of the primary winding and the coil 3 of the primary winding, which are connected in a star schema, and is connected to a three-phase network with zero wire "0", above is to be interconnected to the main coils 4, 5, 6, 7, 8, 9 of the secondary winding having one additional coil 10 of the secondary winding and the tap 11, 12, 13, 14 turns of the main windings 4, 5, 7, 9 of the secondary winding. The Foundation of the primary coil 4 of the secondary winding is connected with the beginning of the primary coil 8 of the secondary winding, forming the node A, the end of the primary coil 8 of the secondary winding is connected to the end of the primary coil 6 of the secondary winding, forming a node At the beginning of the primary coil secondary winding 6 is connected with the beginning of the primary coil 5 of the secondary winding, forming a knot With the end of the primary coil 5 of the secondary winding is connected to the end of the primary coil 9 of the secondary winding, forming the node D, the beginning of the primary coil secondary winding 9 is connected with the beginning of the primary coil 7 of the secondary winding, forming the node E, the end of the primary coil 7 of the secondary winding is connected to the end of the primary coil 4 of the secondary winding, forming the node F and closing the loop "hexagon" A, B, C, D, E, F. Each primary coil of the secondary winding of the transformer is a party "hexagon" A, B, C, D, E, F, transforming a symmetric three-phase system of voltages in a symmetrical six-phase system of voltages. Additional coil 10 of the secondary winding is connected with its early 16th to the top With the "hexagon" A, B, C, D, E, F, which is not linked to the main coils 4 and 5 of the secondary winding on the same core on which oterom is an additional coil 10 of the secondary winding.
We define now the position of the taps 11, 12, 13, 14 turns of the main windings 4, 5, 7, 9 of the secondary winding. For this purpose, the vector diagram, taking the number of turns of the coil is proportional to the length of the corresponding vector of voltage on the coil. The analysis will draw on the example of the primary coil 5 of the secondary winding. We take the length of the vector voltage at phase six-phase of the polygon (figure 2) per unit. Then the number of turns from the start of the primary coil 5 of the secondary winding to the tap 12 coils can be represented by a segment (5-12). The Catete (12-17) - the leg of a right triangle 0-12-17), opposite the corner of the 180: Catete (12-17)=U5Sin180where U5phase five - phase voltage system stresses acting on the taps 11, 12, 13, 14 coils and the output terminal 15 additional coil 10 of the secondary winding: U5=U6Cos300/Cos180U6the voltage at the terminals of each primary coil secondary winding. Geometric analysis of vector diagrams gives the following number of turns of the additional coils: W10W2=(U6-U5)/U6=1-Cos300/Cosl80=0,089, W10=0,089W2. Here W2- number of turns of each primary coil secondary winding. The magnitude of the currents flowing through the main coils 4, 5, 6, 7, 8, 9 the secondary windings equal to the line current Ilwhen balanced the primary five-phase load, and the amount of current flowing through the additional coil 10 of the secondary winding is equal to phase current Ifsymmetrical five-phase load.
The tap 11 and 12 of turns on the primary windings 4 and 5 of the secondary winding divide the number of turns of these coils in the ratio defined by the ratio of segments (5-12):(12-C) ; (5-12)=U6Sin300-U5Sin180. Transform the second term: U5Sin180=U6Cos300Sin180/Cos180=U6Cos300Tg180Sin300/Sin300=U6Sin300Ctg300Tg180. Then cut (5-12)=U6Sin300(1-Ctg300Tg180)=U6Sin300(1-Tg600Tg180). Cut (12-C)=U6Sin300+U5Sin180=U6Sin300(1+Tg600Tg180and the tap will be to divide the number of turns of the main windings 4 and 5 of the secondary winding in the ratio (1-Tg600Tg180):(1+Tg600Tg180). Tap 13 and 14 of turns on primary coil 7 and 9 of the secondary winding divide the number of turns of these coils in the ratio defined by the ratio of segments (C-14):(14-D); (C-14)=U6Sin300-U5Sin60-U6Sin300(1-Ctg300Sin60/Cos180). Ctg300-Tg600, Cos180=Sin720. Finally, we obtain: (14):(14-D)=(1-Tg600Sin60/Sin720):(1+Tg600Sin60/Sin720).
The work of the five-phase inverter of the number of phases is carried out following the way. When connecting a three-phase transformer three-phase network terminals of the transformer there are three magnetic flux, shifted in phase relative to each other in the third part of the period or in the degree measurements on the 1200. The execution of the secondary winding in the form of six main coils 4, 5, ,7 ,8, 9 the secondary winding allows you to get two of the secondary voltage on each phase with the opposite polarity (shift 1800). Thus, when the three voltages of the network, shifted in phase by 1200you get six stresses, shifted relative to each other at 600. When connecting the six main coils 4, 5, 6, 7, 8, 9 the secondary winding as described above, it is "hexagon" A, B, C, D, E, F with a symmetrical six-phase system of voltages. The analysis showed that the turns of the main coil 4, 5, 6, 7, 8, 9 the secondary winding forming a "hexagon" A, B, C, D, E, F, there are four points a, c, d, e on the taps 11, 12, 13, 14 turns, the potentials which differ in phase by one-fifth part of the period (which in the degree measurements equals 3600/5=720), and the fifth point b is located on the output terminal 15 additional coil 10 of the secondary winding and thus creates a five-phase symmetrical voltage system.
Thus, the claimed architecture allows to reduce the consumption of active Mat is rials when replacing a three-phase group of the transformer is three, with just half the number of secondary windings (with the family instead of fifteen), which ultimately helps to improve the weight / size performance of the Converter, to simplify the design of the Converter, the technology of its production and reduce the cost.
Analysis of the claimed technical solution for compliance with the conditions of patentability showed that specified in the independent claim, the symptoms are significant and interrelated with the formation of stable aggregate the necessary signs, unknown at the date of priority from the prior art, sufficient to obtain the desired synergistic (sverhsummarny) technical result.
Properties that are regulated in the claimed combination of individual characteristics, are well known in the art and require no further explanation.
Thus, the above data confirm that the implementation of the use of the claimed technical solution the following cumulative conditions:
object embodying the claimed technical solution, its implementation is intended for use when creating a regulated DC drives;
for the declared object in the form as it is described in the independent claim, confirmed the possibility of its implementation using the above described in the application materials known from the prior technology is key to the priority date tools and methods;
object embodying the claimed technical solution, its implementation is able to achieve perceived by the applicant of the technical result.
Therefore, the claimed object meet the requirements for patentability of "novelty", "inventive step" and "industrial applicability" under the current law.
Five-phase inverter of the number of phases, representing a three-phase transformer comprising three coils of the primary winding and the seven coils of the secondary winding to the outputs of the five-phase voltage, characterized in that the six coils of the secondary winding is made in the form of the main coils of the secondary winding two at each terminal of the transformer, and one additional coil secondary winding located on the core of the transformer, which are the two primary coils of the secondary winding made with tap positions, dividing the number of turns of each of the coils in relation to (1-Tg60°Tg18°):(1+Tg60°Tg18°) from the beginning coil, and the other two main coils of the secondary winding is made with tap positions, dividing the number of turns of each of the coils in relation to (1+Tg60°Sin6°/Sin72°):(1-Tg60°Sin6°/Sin72°) from the beginning of the coil, and with taps from the other two primary coils of the secondary winding and the output of the additional coil secondary winding are the first outputs of the five-phase system of voltages of the Converter, in addition, all primary coil secondary winding interconnected nodes in a single path in the form of "hexagon" so that the voltage between nodes form a six-phase system voltage in the coil secondary winding your beginning connected to the node of circuit "hexagon", which is not associated with the main coils of the secondary winding of the phase, on the rod which is additional coil secondary winding.
SUBSTANCE: drive system for actuation of a tap changer for the purpose of on-load transformer voltage control comprises an electric motor (20), made as capable of connection with a movable part of the specified tap changer for its displacement for the purpose to perform a tap-changing operation. The system comprises an electric converter (33) for connection of a supply source (24) to the specified electric motor (20), and also a device (34) of control made as capable of electric converter control with the purpose to control operation of the motor and thus the specified tap changer.
EFFECT: expanded operational capabilities by provision of ability to adapt to various levels of controlled voltage and to various characteristics of tap changers.
26 cl, 7 dwg
FIELD: electric engineering.
SUBSTANCE: in the transformer machine for alternating current electric rail roads, which contains three-phased traction transformer, having three-rod magnetic conductor, primary winding connected to power network, and secondary winding, phase windings of which are connected to each other, two volt-adding windings, each one of which is positioned on the middle rod of three-rod magnetic conductor and connected by one end to appropriate section of contact network, and by other end - to one of windings of phases of secondary winding, which is positioned on extreme rod of three-rod magnetic conductor. In accordance to the invention, each volt-adding winding is fitted with a voltage regulation device.
EFFECT: creation of transformer machine with voltage management for electric railroads, characterized by high operational reliability due to flexible adjustment of numbers of coils of enabled volt-adding windings.
FIELD: electrical engineering.
SUBSTANCE: proposed transformer set has three-phase traction transformer incorporating three-leg magnetic core, primary winding connected to power circuit, and secondary winding built of two phase windings disposed on extreme legs of three-leg magnetic core; finishing leads of these windings are designed for connection to contact system; in addition it has two voltage boost windings, each being disposed on intermediate leg of three-led magnetic core and connected through one lead to traction rail and through other one, to starting lead of one of secondary winding phases disposed on one of extreme legs of three-leg magnetic core. Each of voltage boost windings is proposed to be provided with voltage regulator. Provision is made for joint or separate voltage regulation for each of two contact-system sections.
EFFECT: reduced current and power loss in contact system due to raising voltage across contact system at constant input power of locomotive, improved balancing of supply mains phase currents.
1 cl, 5 dwg
FIELD: electrical engineering.
SUBSTANCE: novelty is that one more secondary winding is proposed to be introduced in adjustable-voltage transformer set that has three-phase traction transformer incorporating primary winding connected to supply mains and secondary winding whose phase windings are interconnected and are provided with three leads of which two ones are designed for connection to contact system and third one, to traction rail; it also has voltage booster whose primary winding leads are connected to phase b leads of three-phase traction transformer secondary winding and its secondary winding is inserted between starting lead of phase a winding and first section of contact system; additional secondary winding is proposed to be inserted between phase c leads and second section of contact system; each secondary winding of voltage booster is proposed to be provided with voltage regulator.
EFFECT: enhanced quality of electrical energy complying with specified requirements due to minimizing equalizing current occurring in traction network.
1 cl, 1 dwg
FIELD: on-load voltage regulation in power and converter transformers.
SUBSTANCE: newly introduced in proposed method for transformer winding tap changing without opening load current circuit, including voltage checkup, in which control pulses are supplied to thyristors of thyristor switches, each incorporating thyristors connected in parallel opposition inserted in tap circuits of transformer winding are procedures of checking currents carried by thyristors of each thyristor switch, voltage recording when current crosses zero, and changing-over transformer winding taps by applying control pulses to one of thyristors incorporated in respective switch depending on time remaining till voltage polarity is reversed.
EFFECT: enhanced reliability.
2 cl, 8 dwg
FIELD: continuous switching of tap-changing-under-load transformers.
SUBSTANCE: proposed stepping thyristor switch has mechanical stepping selector and load switch. Stepping selector only is disposed in transformer oil tank while load switch incorporating thyristors is mounted in separate case attached to one side wherein it is held in air medium, so that switch thyristors are disposed away from hot transformer oil.
EFFECT: enhanced reliability and service life of switch.
SUBSTANCE: device contains an alternating current source, bridge rectifier of AC voltage into DC voltage, filter capacitor, stabilised DC voltage supply, FET-based power key, standard microcircuit chip of pulse-type regulator that controls the average value of current in the circuit of LEDs connected in-series and ripple-filter choke by means of FET-based power key, current limiting resistance, the first inverse current diode, controlled generator of width-modulated pulses. The converter circuit is equipped additionally with parallel LC-loop, the second inverse current diode and high-frequency capacitor; one output of this loop and cathode of the second inverse current diode are connected to anode of the circuit of LEDs connected in-series and cathode of the first inverse current diode while the other output of the parallel LC-loop is connected to the positive arm of the filter capacitor with high-frequency capacitor connected to it; anode of the second inverse current diode is connected to the negative arm of the filter capacitor.
EFFECT: improved efficiency of the converter.
FIELD: electrical engineering.
SUBSTANCE: device consists of capacitors and diodes connected in ladder circuit. Groups of paralleled capacitors with the same capacitance are connected in parallel to all capacitors except for the capacitor connected to the output terminal. Number of capacitors in each group is increased in direction from the output terminal to the input one according to the law of arithmetical progression.
EFFECT: increase of load power.
FIELD: electrical engeneering.
SUBSTANCE: remote transmission and conversion of ultra high frequency electromagnetic energy into direct electric current and can be applied for low-power rectifier. Converter of UHF-range electromagnetic wave energy into continuous voltage contains antenna and rectifier, having N stages of voltage multiplication and containing 2N or 4N valve elements. Valve elements of the rectifier are diodes with PWL volt-ammeter curve with point of inflection at 0 V expressed by I=S1*U with U>0 and I=S2*U with U≤0, where S1 and S2 - constant coefficients. Coefficients ratio S1/S2 is no less than 100 with S1 coefficient being 10-4 Ohm-1 to 10-2 Ohm-1.
EFFECT: increased effectiveness of rectifier conversion of varying voltage into constant by 3…10 times with input signal power less than 20μW and the possibility of coordination of rectifier with antenna without using additional transformer in output resistance range of antenna from 20 to 1000 Ohm.
1 dwg, 2 dwg
SUBSTANCE: combined rectifier comprises diodes (1-9), matching power transformer (10), step-up power transformer (11), capacitors (12, 13) and load (14). To rectify AC voltage and current by combined rectifier, diode (1), primary windings of transformers (10) and (11) are connected serially to each other and source of AC voltage, diode bridge of diodes (2-5) is connected to secondary winding of transformer (10) and capacitor (12), diode bridge of diodes (6-9) is connected to secondary winding of transformer (11) and to capacitor (13), positive pole of diode bridge of diodes (2-5) and capacitor (12) is connected to negative pole of diode bridge of diodes (6-9) and capacitor (13). Load (14) is connected to negative pole of diode bridge of diodes (2-5) and capacitor (12) and with positive pole of diode bridge of diodes (6 - 9) and capacitor (13), with the help of diode (1) half-wave rectification of AC current is carried out, AC EMFs are induced in transformers (10) and (11), which are then rectified by full-wave rectifiers of diodes (2-5) and (6-9), filtered with the help of capacitors (12) and (13), summed by serial connection of diode bridges and capacitors, and total EMF is sent to load (14).
EFFECT: improved efficiency.
SUBSTANCE: converter of AC into DC with 16-fold frequency of pulsation may find application for supply to DC loads, preferably with low voltage supply. Proposed converter comprises three-phase transformer with valve winding, consisting of nine phased windings, arranged as three on each of rods, besides one of phased windings on each rod has two intermediate taps. Tap located closer to the beginning of winding (relative number of turns in which is accepted as 1.0) placed onto one (first) of rods is connected to beginning of two taps (relative number of turns in which are accepted as tg30°) eith taps arranged on two other rods. Tap arranged closer to the end of winding on the first rod is connected to ends of two windings (having relative numbers of turns tg30°·tg22,5°) without taps arranged on two other above-specified rods. Ends of two inactive windings (having relative numbers of turns tg30°·(2sin52,5°-1)) on two other rods are connected to the first taps of windings from the beginnings to taps arranged on similar other rods as mutually crosswise, and the second taps of these windings separated from the first taps by number of turns in relative units equal to 2tg30°·(sin22.5°-sin7.5°), are connected to ends of two windings (relative numbers of turns in which are accepted as tg30°·(1-2sin22.5°)·k, where k=sin63.75°/sin56.25°) without taps arranged on the first of specified rods. Relative number of turns in part of winding arranged on the first rod, from its end to the second tap is equal to tg30°·tg22,5°·k, and part arranged between taps - 2tg30°·tg15°. Converter also comprises ten-phase valve bridge, opposite poles of which create output terminals of device, to which load is connected. Ten free phase terminals of valve winding are connected to AC inputs of ten-phase valve bridge.
EFFECT: converter has higher efficiency factor and is less complex in manufacturing.
SUBSTANCE: multi-phase bridge ac/dc converter is intended for power supply to consumers with high requirements for quality of rectified voltage and electromagnetic compatibility. The proposed multi-phase bridge ac/dc converter includes n converter structures, each of which includes six-phase valve bridge and three-phase transformer, the secondary phase windings of which are connected as per the scheme forming the source of non-symmetrical six-phase system of voltages, the two values of which alternate as per the value from phase to phase through an angle of 60 electrical degrees, and phase outputs of the source are connected to ac inputs of six-phase valve bridge; at that, secondary phase windings of transformers are connected as per similar schemes, and for all the structures there established is ratio between values of voltages of adjacent phases, which alternate in non-symmetrical six-phase systems, which is determined relative to base topological sizes of phase windings (beams) of equivalent non-symmetrical six-phase starts, from ratio where electrical degrees, and n=2, 3, 4, 5, …, - total number of converter structures; at that, primary windings of transformers are made as per the schemes providing subsequently increasing (decreasing) phase shift (by Δφ=π/3n electrical degrees) of non-symmetrical six-phase systems of voltages relative to the first system, and n six-phase valve bridges are connected in series to each other with opposite poles; at that, extreme opposite poles of the first and the last bridges form output pins of the device.
EFFECT: proposed multi-phase bridge ac/dc converter has higher conversion quality.
5 dwg, 1 tbl
SUBSTANCE: converter of three-phase voltage into DC voltage is intended for supply of DC loads with increased requirements to reliability of converter. Suggested converter ar p-multiple frequency of rectified voltage pulsation comprises p/6 three-phase sources of power supply, identical voltages of which are serially shifted by phase by 2 π/p electric degrees, and n=(p/6)+1 serially located valve groups, extreme of which comprises three valves combined into anode and cathode valve stars, common points of which create outlet leads of device, and other groups represent six valve rings with three pairs of diametrically installed points of identical valve electrodes connection, extreme valve groups are connected to adjacent groups in three units, every of which is created by free electrode of anode (cathode) valve star and free point of connection of valve electrodes in adjacent valve ring, created by electrodes of another name, adjacent valve rings are connected in three units, every of which is created by free pair of connection points of valve electrodes in adjacent rings, besides in these units electrodes of valves in one adjacent ring have one name, and valve electrodes of the second ring - another one, moreover, one of phases of one of three-phase sources of supply is connected to each unit of adjacent valve groups connection, besides each of phases of any supply source is connected via valves of rings only with phases of adjacent sources of supply, having phase shifts electric degrees, relative to this phase. Overvoltage protection device is connected to each pair of diametral points of six valve rings. Overvoltage protection devices may comprises asymmetrical limiters of voltage, electrodes of which are connected with identical electrodes of ring valves.
EFFECT: suggested converter of three-phase voltage into DC voltage has higher reliability.
2 cl, 8 dwg
SUBSTANCE: invention relates to electrical engineering and may be used for electron-beam equipment energising and in other industries where powerful power supplies with high voltage are required. The high-voltage transformer with multi-section secondary winding used as high-voltage power supply forms the basis of the invention. Each section of the secondary winding contains serial connection of rectifying unit with capacitive filter and pulse regulator of reducing type with the additional elements. All regulators outputs are serially interconnected. The above arrangement of regulator section connection by power supply output makes the required high voltage value achievable for the process equipment. When regulators power supply with the additional elements is used in the output circuits, the electrical breakdown and arc discharges influence on electron-beam equipment operation can be avoided.
EFFECT: increase of process equipment effectiveness and reliability.
4 cl, 6 dwg
FIELD: electrical engineering.
SUBSTANCE: converter of AC voltage to DC with 18-fold frequency of pulsation may find application for supply to DC loads. Converter contains three-phase transformer (1) with three identical groups of secondary windings, which are connected in every group as star and reverse star and united with zero points O, O' and O'' into six-phase stars and thirty valves (2...31). Numbers of turns in corresponding cophased parts of six-phase stars windings are equal, and ratio of stars windings turns numbers to numbers of reverse stars windings turns makes From twelve valves of device two six-valve rings are formed, one from valves (6, 11, 16, 21, 26, 30), the other from valves (7, 12, 17, 22, 27, 31). Valves in every rings are connected serially with cathodes that form ring outputs, and anodes that form ring inputs. Two reverse three-valve stars are formed from six valves, anode one form valves (2, 15, 25) and cathode one from valves (5, 10, 20). Common points of three-valve stars form output terminals of device (32) and (33), to which load (34) is connected. Outputs of windings of the first group of windings are connected to the inputs of the first six-valve ring, outputs of which are connected to outputs of windings of star of the second windings group, which are also connected to inputs of the second six-valve ring, outputs of which are connected to outputs of windings of star of the third windings group. Every input of six-valve rings, which is connected to the output of star winding installed on one of the transformer rods, is connected by pair of valves that form this input, with outputs of windings of the other neighboring star, which are installed in two other transformer rods. Outputs of windings of star in the first group of windings a, b, c are connected by valves (3, 13, 23) with outputs x', y', z' of reverse star winding in the second group of windings and with cathodes of valves (15, 25, 32) of the first three-valve star. Outputs x, y, z of reverse star windings in the first group of windings are connected by valves (18, 28, 8) with outputs a', b', c' of star windings in the second group of windings, every of which is accordingly connected by valves (4, 14, 24) with outputs x", y", z" of reverse star windings in the third group of windings. Every output x', y', z' of reverse star winding in the second group of windings is connected by valves (19, 29, 9) with outlets a", b", c" of star winding in the third group of windings and to cathodes of valves (5, 10, 20) of the second three-valve star. All converter valves are connected unidirectionally.
EFFECT: higher quality of electric energy conversion.
SUBSTANCE: invention resolves the problem of producing three-phase alternating voltage converter into direct voltage being characterised by wide voltage control capabilities in contact circuits as well as high energy indicators at relatively simple design. To resolve this problem, three-phase regulated converter of alternating voltage into direct voltage includes converting transformer with three-phase primary winding coupled in star shape with ends linked to input leads designed to connect supply network, and two three-phase secondary windings, at least, one of them being coupled in star shape. The first valve rectifier and booster transformer having one three-phase primary and two three-phase secondary windings are connected in series in each phase with corresponding secondary windings of converting transformer. Booster transformer secondary winding is connected to each phase of star-coupled secondary winding of converting transformer. Controlled reactor is coupled in series with booster transformer secondary winding. Together with booster transformer secondary winding controlled reactor forms a circuit, non-controlled reactor being parallel to the said circuit. Non-controlled reactor winding ends form common points together with ends of circuits containing serial connection of booster transformer secondary winding and controlled reactor winding. According to the invention, it is proposed to introduce another valve rectifier similar to the first one and being in serial connection with it, the both valve rectifiers being designed to connect load. The second secondary winding of booster transformer is to be connected in zigzag pattern and linked with the second secondary winding of converting transformer coupled in triangular manner; each of the two valve rectifiers should be made in the form three-phase bridge. Common connection points of controlled and non-controlled reactors should be coupled with one of bridges; ends of each zigzag coupled secondary winding phase in booster transformer should be linked with controlled reactors while non-controlled reactors should be connected in parallel to circuit of zigzag coupled booster transformer secondary winding and in series to it by controlled reactor winding. In each phase, winding ends of controlled and non-controlled reactors form common point connected with the second valve bridge rectifier.
EFFECT: simplification and improvement of energy indicators.
SUBSTANCE: control method involves use of similar modules switched in control chains either to a drive or driven module modes; besides, in the drive module there used is additional feedback as to current of capacitors of output filters of modules. In case of failure of any of the modules, it is disconnected from load and the primary power network, and an operating mode of each module, if required, is changed by means of switches. In order to change over the driven module to the drive module operation, a signal is supplied to its input, which is obtained by switching an input chain from the setting signal of current to sine-shaped voltage signal, from which the connected signal of the main feedback as to voltage and total current signal of capacitors of output filters of modules is deducted. At the same time, a current signal of the drive module is connected to a common control bus of output current of the drive module. When an additional module is being introduced to an uninterrupted power source, first, it is set to a drive module mode, and then it is switched over to a driven module mode.
EFFECT: improving reliability of an uninterrupted power supply system with AC output and its scalability.