【摘要】 针对电气化铁路单相整流方式带来大量负序、谐波和无功的特点,结合多功能平衡变压器具有低压两相端口和低压三相端口的特点,提出一种采用三相电压源变流器(VSC)结合晶闸管投切电容器(TSC)构成的电能质量补偿系统。两套多组TSC补偿绝大部分无功能量,VSC通过电感直接与多功能平衡变压器低压三相端口相连,补偿谐波、负序和剩余的无功分量,降低了VSC容量,有利于工程应用。详细讨论了方案及其特点,设计了无功分配策略,根据理想补偿效果,通过构造虚拟电流,推导了基于磁动势平衡原理的补偿算法,建立了补偿等效电路模型并得到了补偿电流关系式,得出了参考电流实时检测和无功电流分配方法。仿真和实验证明所提方案的正确性。更多还原

【Abstract】 To compensate amount of harmonics, negative sequence current and reactive power generated by single-phase traction load which is varied in random and fluctuant, a novel integrated compensator based on multi-purpose balance transformer, which contains a two-phase port and a three-phase port in the secondary, is proposed in this paper. The compensator consists of a three-phase voltage source converter(VSC) and two multi-groups thyristor switched capacitor(TSC). TSC is used to compensate the most reactive power. VSC is connected to the three-phase port through the filter inductor to compensate the harmonics, negative and the remaining reactive currents. So the capacity of VSC is reduced and good for engineering realization. Firstly, the operation principle of the system is clarified. Then the reactive current distribution method is designed and the compensation algorithm based on balanced mmf using virtual current is deduced. Furthermore, the compensation equivalent circuit mode is established, the reference current detecting and the collaborative control strategy for TSC and VSC based on reactive power current abruption VSC are presented. Simulation and experimental results show the validity of the proposed system.更多还原