基于前馈直流电压补偿的同相供电仿真分析

Simulation Analysis of In-phase Power Supply Based on Feedforward DC Voltage Compensation

针对电气化铁路普遍存在电分相及电能质量问题,研究了单相组合式同相供电方案。采用改进的有功电流分离法及积分均值滤波器替代低通滤波器生成指令电流,以提高控制的准确性及动态速度。提出一种补偿式直流电压前馈控制方法,对高压匹配变压器的有功损耗进行补偿,使直流侧电压稳定在参考值。最后对该方案进行了仿真分析,验证了控制策略能够补偿负序、无功和谐波,使系统侧三相电流平衡,满足电能质量的要求。

In order to solve the problem of electric separation and power quality of electrified railway,the in-phase combined-phase power supply scheme was studied. An improved active current separation method and integral mean filter replacing the low pass filter were used to generate the command current in order to improve the accuracy and dynamic speed of the control. A kind of compensating DC voltage feedforward control method was proposed to compensate the reactive power loss of the high voltage matching transformer,and the DC side voltage was stabilized at the reference value. Finally,the simulation analysis was carried on to the scheme to verify that the control strategy can compensate reactive power and negative sequence and harmonic,make the system side three phase current balance and meet the requirements of power quality.