采用V/v变压器的高速铁路牵引供电系统负序和谐波综合补偿方法

Integrative Compensation Method of Negative Phase Sequence and Harmonic for High-speed Railway Traction Supply System With V/v Transformer

为解决高速铁路牵引供电系统中的负序、谐波电能质量问题,提出采用铁路功率调节器(railway static power conditioner,RPC)进行负序和谐波电流综合治理。RPC包含共用直流侧电容的背靠背形式的两变流器,控制其功率能够实现负序补偿和谐波抑制。分析RPC的基本结构和补偿原理后,提出三相V/v变压器下负序和谐波补偿电流检测方法,为保证RPC直流侧电压稳定和实现负序和谐波补偿,提出RPC直流侧电压和两变流器电流控制策略。最后,进行仿真验证。仿真结果表明,在该文提出的负序和谐波检测方法及控制策略下,RPC具有良好的负序和谐波补偿性能。

In order to solve the power quantity problem of negative sequence current and harmonic current in high-speed railway, railway static power conditioner （RPC） was adopted. RPC contains two inverters which are connected with each other by sharing a DC capacitor, the negative sequence current and harmonic current can be restrained together by controlling the power of the two inverters. The structure and compensation principle of RPC was introduced, and the negative sequence current and harmonic current compensating reference detecting method for three-phase V/v transformer was presented. To maintain the DC voltage and compensate negative sequence and harmonic current, the DC voltage control and the current control for two inverters of RPC was presented. Simulations have confirmed that the RPC can achieve good performance under the negative sequence and harmonic current detecting method and the control strategy proposed in this paper.