基于RPC结构的制动能量回收的稳定性分析方法

Stability Analysis Method of Braking Energy Recovery Based on RPC Structure

面对我国电气化铁路升级发展趋势势不可挡的情况,有必要对电力机车运行中出现的谐波、负序电流、电压波动等电能质量问题进行研究。铁路功率调节器作为当下的研究热点,几乎可以解决所有电能的质量问题。另外,由于RPC具备优秀的外部拓展性,可以通过外接储能元件对机车的再生制动能量进行回收利用,但RPC本身也存在稳定性问题。文章旨在对RPC中间的直流环节外接储能单元的系统进行稳定性分析,选用阻抗分析法,同时现有阻抗判据具有一定的局限性,对该系统进行稳定性分析时,由于系统具有多种工作状态,分析过程繁琐复杂。文章参考了一种直流分布式电源的通用稳定性判据,然后分别对各种工作状态进行分析,最后通过仿真模拟证明了方法的可行性。

Facing the unstoppable development trend of electrification railway,it is necessary to study power quality problems such as harmonics,negative sequence current and voltage fluctuation in the operation of electric locomotive.As a research hotspot,railway power regulator can solve almost all power quality problem.In addition,due to the excellent external extensibility of RPC,external energy storage components can be connected to recover and utilize the regenerative braking energy of the locomotive,but RPC has its own stability problems.The purpose of this paper is to analyze the stability of the system connected to the external energy storage unit of the DC link in the middle of RPC,and impedance analysis method is chosen.Meanwhile,the existing impedance criterion has certain limitations,and the analysis process of the stability analysis of this system is complicated due to the multiple working states of the system.This paper refers to a general stability criterion of DC distributed power supply,then the various working states were analyzed,and the feasibility of the method was proved by simulation.