摘要
为进一步降低铁路功率调节器在大功率补偿过程的开关频率,采用开关频率较低的混合级联81电平变换器作为电压源、开关频率较高的单相全桥变换器作为电流源,将两个电压源背靠背连接,提出一种81电平铁路功率调节器。由于系统中承担85%的补偿功率的开关器件的开关频率在250 Hz及以下,开关频率高的电流源仅承担1%的功率,因此系统开关损耗小且对补偿电流参考信号的跟踪性能好。研究了系统的基本结构及其等效电路,通过构建等效对称三相电压源建立等效三相电路,采用有功功率平均分配法,使得补偿后的系统等效为Y-Y型对称三相电路,从而实现不平衡电流补偿,并提出一种新的补偿电流检测方法。仿真结果证明所提系统及其补偿方法的有效性和可行性。
In order to reduce the switching frequency of railway power conditioner in the process of high power compensation,a hybrid cascade 81-level converter with low switching frequency is used as the voltage source and a single-phase H bridge converter with high switching frequency is used as the current source.The two voltage sources are connected back-to-back,and an 81-level railway power conditioner is proposed.Since the switching frequency of the switching devices that bear 85%of the compensation power in the system is 250 Hz and below,and the current sources with high switching frequency only bear 1%of the power,the system has small switching loss and good tracking performance for the compensation current reference signal.The basic structure of the system and its equivalent circuit is studied,the equivalent three-phase circuit is established by constructing the equivalent symmetrical three-phase voltage source,the active power average distribution method is used to make the system equivalent to Y-Y symmetrical three-phase circuit,so that the imbalance compensation is realized,and a new compensation current detection method is put forward.Simulation results show the effectiveness and feasibility of the proposed system and its compensation method.
作者
卜健怡
张长征
BU Jianyi;ZHANG Changzheng(Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan 430070,China)
出处
《电机与控制应用》
2022年第2期97-103,共7页
Electric machines & control application
基金
湖北省技术创新专项重大项目(2019AAA018)。
关键词
铁路
铁路功率调节器
多电平
不平衡补偿
railway
railway power conditioner
multi-level
imbalance compensation
