CN204578377U - A kind of cascade-mixing transformation apparatus in parallel - Google Patents

A kind of cascade-mixing transformation apparatus in parallel Download PDF

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Publication number
CN204578377U
CN204578377U CN201520232271.XU CN201520232271U CN204578377U CN 204578377 U CN204578377 U CN 204578377U CN 201520232271 U CN201520232271 U CN 201520232271U CN 204578377 U CN204578377 U CN 204578377U
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phase
output
cascade
voltage
unit module
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Expired - Fee Related
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CN201520232271.XU
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Chinese (zh)
Inventor
何晓琼
崖尚松
王鹏
舒泽亮
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Southwest Jiaotong University
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Southwest Jiaotong University
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Abstract

The utility model discloses a kind of cascade-mixing transformation apparatus in parallel, the energy is provided by three phase mains, by cutting transformer, power supply is divided into three-phase, each phase voltage of secondary winding is split as several independently low-voltages, these independent voltages, respectively through single-phase-single-phase invertor, form single phase alternating current (A.C.) output voltage by cascade.And every phase cascaded-output is connected to load through LC filter circuit after parallel connection respectively, form three-phase-single-phase invertor.Described power unit module is single-phase-single-phase PWM converter, and converter can be two level block, also can be many level block.Topological structure of the present utility model can make low-voltage device be applied to high pressure occasion, realizes inverter and exports with higher electric pressure, go back changeable cascade, parallel units to meet different designing requirements.Output can connect load and be regarded as a three-phase single-phase invertor; The utility model also can be applicable to electric railway as in homophase electric power system, and output can be Traction networks and powers, and provides three phase mains A, B, C three-phase of the energy can load sharing or Traction networks power demand jointly, and energy capable of bidirectional flowing.

Description

A kind of cascade-mixing transformation apparatus in parallel
Technical field
The utility model relates to a kind of cascade-mixing transformation apparatus in parallel, particularly relates to a kind of cascade for electric railway-mixing transformation apparatus in parallel.
Background technology
Converter carries out transformation of electrical energy by power electronic technology, and it utilizes thyristor circuit, and what all kinds of interchange or DC power supply input are changed into required output voltage and frequency stabilization exchanges output.Nowadays also impel high power converters fast-developing developing rapidly of the field such as backup system of electric power system, storage battery, the purposes of high power converter is also increasingly extensive.Also be like this for electric railway design, need to export enough powerful power supply for locomotive trouble-free operation at inverter side.Be applied to the converter of electric railway, it is very strict that it exports power requirements, and how improving converter capacity simultaneously and to improve the quality that it exports electric energy, is an important development direction of modern inversion transformation technique.Therefore studying the circuit topological structure of high power converter, thus improve converters capacity and improve its output quality of power supply, is extremely have Research Significance.
Converter cascade has the characteristic of series connection, can provide input by the module of smaller power, realizes high-power and exports, and realizes making low-voltage device be applied to high pressure occasion, the function that converter exports with higher electric pressure.The parallel running of converter, not only can realize power combing, improves the grade of output current, meets the requirement that changer system big current grade exports, and increases the capacity of power supply, and can improve the reliability of power supply.
In the middle of electric railway design, electric power system output voltage can only arrive 27.5kv, if desired continues to increase converter output capacity, only continue to increase concatenation unit just null(NUL), at this moment can consider to add parallel connection, improve output current, thus increase converter capacity further.
Utility model content
The purpose of this utility model is just to provide a kind of cascade-mixing transformation device topological structure in parallel, it is flexible that this topological structure has control mode, the phase place of output voltage and amplitude all can need to carry out regulation and control according to equipment, the expansion of power converter cells can be carried out according to engineering actual demand, and harmonic wave of output voltage content is low, converter operating efficiency is higher, accommodates for advantages such as high-power outputs.
The utility model solves its technical problem, and the technical scheme adopted is:
A kind of cascade-mixing transformation apparatus in parallel, the energy is provided by three phase mains, by transformer, power supply is divided into three-phase, each phase voltage of secondary winding is split as several independently low-voltages, these independent voltages, respectively through single-phase-single-phase invertor, form single phase alternating current (A.C.) output voltage by cascade; And every phase cascaded-output is connected to load through LC filter circuit after parallel connection respectively, form three-phase-single-phase invertor, its concrete connected mode is:
A, cutting transformer first side winding connect three phase mains, each phase voltage of secondary side winding is split as the individual independently low-voltage of n, for first-phase voltage, each independently low-voltage all connect with corresponding power unit module, the cascade successively of power unit module 11 to 1n output, namely the output negative terminal mouth 11N of power unit module 11 is connected with the output plus terminal mouth 12P of power unit module 12, the output negative terminal mouth 12N of power unit module 12 is connected with the output plus terminal mouth 13P of power unit module 13, by that analogy; In like manner, second and third phase voltage is identical with first-phase with power unit module connected mode.Output port after each phase power module cascade connection is respectively 11P and 1nN, 21P and 2nN, 31 and 3n;
B, output 11P, 21P, 31P end are connected to P point jointly, be connected with load or Traction networks anode after filtering LC filter circuit, output 1nN, 2nN, 3nN end is connected to N point jointly, is connected, realizes the parallel connection of three single phase alternating current (A.C.) output voltages with load or Traction networks negative terminal;
Described power unit module is single-phase-single-phase PWM converter.
The utility model cascade-mixing transformation device in parallel, can make low-voltage device be applied to high pressure occasion, realize converter and export with higher electric pressure, and converter parallel connection can improve the grade of output current, meets the requirement of changer system High-current output.Output can connect load, then this device can be considered a three-phase-single-phase invertor; This device also can be applicable to electric railway as in homophase electric power system, and output can be Traction networks and powers, and provides three phase mains A, B, C three-phase of the energy can load sharing or Traction networks power demand jointly, and energy capable of bidirectional flowing.
Compared with prior art, the beneficial effects of the utility model are: can regard as a three-phase-single-phase invertor, for different loads provides the energy; For electric railway, because output rated voltage is 27.5kv, the higher capacity requirement of load cannot be met by continuing to improve output voltage grade, therefore the utility model is improved its topological structure on the basis of inverter side cascade, add parallel-connection structure, the advantage of converter cascade booster tension grade is combined with the advantage of motor current grade in parallel, realizes high-power output, meet different designs demand.
Accompanying drawing explanation
Fig. 1 be the utility model embodiment circuit theory diagrams;
Fig. 2 be based on two level H-bridge structures single-phase-single-phase PWM converter;
Fig. 3 be based on three level diode clamp structure single-phase-single-phase PWM converter.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is cascade of the present utility model-mixing transformation device main circuit diagram in parallel, the energy is provided by three phase mains, by cutting transformer, power supply is divided into three-phase, cutting transformer first side winding connects three phase mains, each phase voltage of secondary side winding is split as the individual independently low-voltage of n, as U in Fig. 1 n1, U n2, U n3shown in, for the 1st phase voltage, each independently low-voltage all connect with corresponding power unit module, the cascade successively of power unit module 11 to 1n output, namely the output negative terminal mouth 11N of power cell 11 is connected with the output plus terminal mouth 12P of power cell 12, the output negative terminal mouth 12N of power cell 12 is connected with the output plus terminal mouth 13P of power cell 13, by that analogy.In like manner, the 2nd, 3 phase voltages and power unit module connected mode and the 1st mutually identical.Output port after each phase power module cascade connection is respectively 11P and 1nN, 21P and 2nN, 31 and 3n.Output 11P, 21P, 31P end is connected to P point jointly, be connected with load or Traction networks anode after filtering LC filter circuit, output 1nN, 2nN, 3nN end is connected to N point jointly, is connected, realizes the parallel connection of three single phase alternating current (A.C.) output voltages with load or Traction networks negative terminal.Described power unit module is single-phase-single-phase PWM converter, and converter can be two level block, as shown in Figure 2, also can be many level block, as three level diode clamp structure in Fig. 3.
The cascade that the utility model proposes-mixing transformation device in parallel, converter cascade can make low-voltage device be applied to high pressure occasion, realize converter to export with higher electric pressure, and converter parallel connection can improve the grade of output current, meets the requirement of changer system High-current output.Output can connect load, then this device can be considered a three-phase-single-phase invertor; This device also can be applicable to electric railway as in homophase electric power system, and output can be Traction networks and powers, and provides three phase mains A, B, C three-phase of the energy can load sharing or Traction networks power demand jointly, and energy capable of bidirectional flowing.

Claims (2)

1. cascade-mixing transformation apparatus in parallel, it is characterized in that, the energy is provided by three phase mains, by transformer, power supply is divided into three-phase, each phase voltage of secondary winding is split as several independently low-voltages, these independent voltages, respectively through single-phase-single-phase invertor, form single phase alternating current (A.C.) output voltage by cascade; And every phase cascaded-output is connected to load through LC filter circuit after parallel connection respectively, form three-phase-single-phase invertor, its concrete connected mode is:
A, cutting transformer first side winding connect three phase mains, each phase voltage of secondary side winding is split as the individual independently low-voltage of n, for first-phase voltage, each independently low-voltage all connect with corresponding power unit module, the cascade successively of power unit module 11 to 1n output, namely the output negative terminal mouth 11N of power unit module 11 is connected with the output plus terminal mouth 12P of power unit module 12, the output negative terminal mouth 12N of power unit module 12 is connected with the output plus terminal mouth 13P of power unit module 13, by that analogy; In like manner, second and third phase voltage is identical with first-phase with power unit module connected mode.Output port after each phase power module cascade connection is respectively 11P and 1nN, 21P and 2nN, 31 and 3n;
B, output 11P, 21P, 31P end are connected to P point jointly, be connected with load or Traction networks anode after filtering LC filter circuit, output 1nN, 2nN, 3nN end is connected to N point jointly, is connected, realizes the parallel connection of three single phase alternating current (A.C.) output voltages with load or Traction networks negative terminal;
Described power unit module is single-phase-single-phase PWM converter.
2. cascade according to claim 1-mixing transformation apparatus in parallel, it is characterized in that, described converter can be two level block, also can be many level block.
CN201520232271.XU 2015-04-17 2015-04-17 A kind of cascade-mixing transformation apparatus in parallel Expired - Fee Related CN204578377U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104767393A (en) * 2015-04-17 2015-07-08 西南交通大学 Cascading-parallel connection mixing converter device
CN112448593A (en) * 2019-08-27 2021-03-05 中车株洲电力机车研究所有限公司 Traction converter system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104767393A (en) * 2015-04-17 2015-07-08 西南交通大学 Cascading-parallel connection mixing converter device
CN112448593A (en) * 2019-08-27 2021-03-05 中车株洲电力机车研究所有限公司 Traction converter system

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20150819

Termination date: 20180417