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直接电流控制在应用于并联型电能质量控制器的控制系统时,电流环跟踪存在很大误差,但是补偿效果好。对此现象进行分析:电流跟踪误差由电源电压引起,是与电源电压同相位的有功电流,不影响无功和谐波电流的补偿效果;电流跟踪误差影响系统动态过程,产生冲击电流。提出一种启动过程放电来抑制冲击电流的方法。仿真和实验验证了对电流跟踪误差的分析结论的正确性,也验证了抑制动态冲击电流方法的正确性,完善了电流环的工程设计方法。
Direct Current Control When applied to the parallel power quality controller control system, the current loop tracking there is a big error, but the compensation effect is good. This phenomenon is analyzed: the current tracking error is caused by the power supply voltage and is the active current with the same phase with the power supply voltage, which does not affect the compensation effect of reactive power and harmonic current. The current tracking error affects the dynamic process of the system and produces an inrush current. A new method to suppress the inrush current during discharge is proposed. Simulation and experimental results verify the correctness of the current tracking error analysis, and also verify the correctness of the method to suppress the dynamic inrush current and improve the current loop engineering design method.