Five-phase phase changer

FIELD: electricity.

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.

2 dwg

 

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.



 

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3 dwg

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EFFECT: simplification and improvement of energy indicators.

1 dwg

FIELD: electricity.

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.

3 dwg

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