High-speed railway negative-sequence and harmonic compensation system based on two-phase three-wire system converter

Abstract

The invention discloses a high-speed railway negative-sequence and harmonic compensation system based on a two-phase three-wire system converter, comprising two single-phase reducing transformers and a two-phase three-wire system converter, wherein the primary sides of the two single-phase reducing transformers are connected with two single-phase power-supply arms arranged in a three-phase V / V tractive power-supply system, and both ends of the secondary sides of the two single-phase reducing transformers are connected correspondingly with the primary sides, thereby the secondary sides of the two single-phase reducing transformers form three wires; the two-phase three-wire system converter comprises three switch arms, wherein one switch arm is connected with two single-phase voltage sharedground wires, and the other two switch arms are respectively connected with the other two wires in the secondary sides of the two single-phase reducing transformers by an inductor. Compared with two common single-phase converters, the high-speed railway negative-sequence and harmonic compensation system reduces one switch arm and does not increase the current level of a switch device. Compared with the common three-phase converter, the high-speed railway negative-sequence and harmonic compensation system reduces one output inductor to save cost, and the voltage utilization of a direct currentside is one time higher.

Description

technical field [0001] The invention relates to a high-speed railway negative-sequence and harmonic comprehensive compensation system, in particular to a high-speed railway negative-sequence and harmonic compensation system based on a two-phase three-wire converter. Background technique [0002] Because the high-speed railway traction power supply system adopts single-phase power supply mode, negative sequence current is generated, which brings serious harm to the operation of power generation, transmission and transformation equipment in the power system, such as increasing the loss of generators, reducing the output of transformers, etc., seriously affecting Safe and economical operation of power systems. In addition, the harmonics generated by high-speed railway electric locomotives also reduce the reliability of its power supply system and upper-level power system. Therefore, effective measures must be taken to suppress the negative sequence and harmonic currents genera...

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Problems solved by technology

In addition, some scholars have proposed a three-phase active compensation system - active power quality compensator (Active Power Quality Compensator, APQC), its structure is to use Scott transformer to convert two single-phase power into three-phase balanced voltage, and then Connecting a three-phase converter to the three-phase balance through three output inductors saves one arm of power switching devices than RPC, but increases the voltage level of power devices, and requires a more complex Scott transformer and one more Output inductance, its specific structure see figure 2

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