考虑损耗优化的多电平铁路功率调节器的混合环流注入策略  

Hybrid Circulating Current Injection Strategy of Multilevel Railway Power Conditioner Considering Optimized Power Loss

作　　者：岳雨霏 徐千鸣[1] 郭鹏[1] 马伏军[1] YUE Yufei;XU Qianming;GUO Peng;MA Fujun(National Electric Power Conversion and Control Engineering Technology Research Center(Hunan University),Changsha 410082,Hunan Province,China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学)

出　　处：《中国电机工程学报》2019年第24期7311-7324,共14页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51807056)~~

摘　　要：铁路功率调节器(railwaypowerconditioner,RPC)主要承担电气化铁路牵引系统的有功转移和无功、负序补偿。在V/v牵引系统中,多电平铁路功率调节器(multilevel railway power conditioner,MRPC)需补偿无功维持电网电压平衡,此时造成MRPC链节功率不平衡,导致链节间电容电压的发散。为抑制电压发散,需注入环流电压和电流。传统注入方案仅注入直流或交流分量,未考虑MRPC功率损耗等性能。针对应用于V/v牵引系统的MRPC,分析其等效电路模型和链节功率不平衡原因;建立MRPC功率损耗模型,提出优化MRPC功率损耗的混合环流注入策略,并以损耗优化为目标,对环流的幅值和初相角进行优化设计。通过仿真对所提出的混合环流注入策略与传统方案进行对比,验证所提方案的正确性和有效性。Railway power conditioner(RPC) plays an important role in active power transferring and reactive power and negative sequence compensation applications in traction power supply system of the electrified railway. In V/v traction system, the multilevel railway power conditioner(MRPC) needs to compensate reactive power for three-phase gird balance, leading to the power unbalance of clusters and the divergence of inter-cluster capacitor voltages. To suppress the divergence of cluster capacitor voltages, the circulating current and voltage should be injected. The conventional strategies only inject DC or AC circulation component without considering the power loss of MRPC and other performance. In this paper, for the MRPC which was applied to V/v traction system, the equivalent model and the unbalance mechanism of clusters were analyzed. Then, the power loss model of MPRC was established. And a hybrid circulating current injection strategy for optimizing the power loss of MRPC was proposed. The amplitude and initial phase angle of the injected circulating current were designed at the aim of the power loss optimization. Finally, the comparison results of the proposed hybrid circulating current injection strategy and the conventional strategies were implemented by the simulations, validating the correctness and effectiveness of the proposed strategy.

关 键 词：多电平铁路功率调节器 无功补偿 功率损耗 链节电流绝对平均值 混合环流注入策略 

分 类 号：TM46[电气工程—电器]