高速电气化铁路新型电能质量补偿系统

A Novel Power Quality Compensator for High-Speed Electric Railway

针对高速电气化铁路牵引供电系统面临的谐波电流含量高且较分散、负序电流大的电能质量问题,建立一种新型电能质量补偿系统。该系统主要由电气化铁路功率调节器、两组晶闸管控制电抗器和两组晶闸管控制3次滤波器组成,其中电气化铁路功率调节器只用来转移有功功率和治理部分谐波,3次滤波器用于滤除3次谐波和改变供电臂电流相角,电抗器也用来改变供电臂电流相角。该系统以最小的有源容量和较低的成本进行谐波抑制和负序电流补偿。本文在阐述其工作原理的基础上,建立了其基波域和谐波域的统一等效电气模型,并深入研究了其负序补偿和谐波抑制原理,分析了电气化铁路功率调节器最佳容量选取的原则,同时还对整个系统的谐振特性进行了分析,并模拟京沪高速电气化铁路实际供电系统进行了仿真,仿真结果验证了本文研究内容的正确性和有效性。

Due to high harmonic current and large negative sequence current caused by high-speed electric railway,power quality is deteriorated.To solve this problem,a novel power quality compensator constituted by railway static power conditioner（RPC）,two thyristor-controlled reactors and two thyristor-controlled 3rd filters is proposed.The RPC is only used to transfer active power and suppress partial harmonic currents.The thyristor-controlled 3rd filters are used to suppress third harmonic current and change the phase angle of power supply current.The thyristor-controlled reactors are used to change the phase angle of power supply current.The proposed power quality compensator has small capacity and low cost.Furthermore,based on working principle of the proposed power quality compensator,its equivalent electrical models are established in fundamental and harmonic domain.This paper analyzes the best capacity selection principle of RPC as well as the resonant characteristics of the whole system.Moreover,the actual simulation of Beijing-Shanghai high-speed electric railway power supply system is carried.Simulation results show that the study contents of this paper are feasible and valid.