Railway power regulator based on half-bridge structure

Abstract

The invention discloses a railway power regulator based on a half-bridge structure, which comprises two single-phase step-down transformers and a half-bridge inversion module, wherein the half-bridge inversion module comprises a pair of switch arms and a pair of series capacitors, and the switch arms are connected into a back-to-back structure by two capacitors; and the primary sides of the two single-phase step-down transformers are connected with power supply arms at the two secondary sides of a traction transformer, ungrounded lines at the secondary sides of the two single-phase step-down transformers are respectively connected with the switch arms in the half-bridge inversion module by an inductor, and the two single-phase step-down transformers are grounded and are connected with the middle points of the two capacitors in the half-bridge inversion module. Compared with a structure adopting two H-bridge single-phase converters, the cost of the active capacity of the railway power regulator is lowered by one time. Under the precondition that the same function is finished, the cost and the complexity of hardware are decreased, and the reliability of a compensation device is enhanced, so that the invention is greatly beneficial to the high-power modularization of the device and has favorable application prospect.

Description

technical field [0001] The invention relates to a high-speed railway power quality comprehensive compensation system, in particular to a railway power regulator based on a half-bridge structure. Background technique [0002] With the development of electrified railway towards high speed, high power and load, the power quality of its electric traction system becomes more and more critical. 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,...

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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 transform two single-phase power supply into three-phase balanced voltage, and then A three-phase converter is connected to a three-phase balanced power supply through three output inductors, which saves one switching arm or two power switching devices than RPC, but requires a more complicated balancing transformer

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