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在负载正常工作时所需的额定电压的基础上,该文讨论通过控制串联变压器二次侧工作电流来约束负载电流,从而使负载电压恒定。该文采用负载电流周期平均模型(perioda verage model,PAM)提高了负载电流跟踪额定电流的速度和精度,加快了动态电压恢复器(dynamic voltage restorer,DVR)系统的动态响应速度。考虑到负载电流中有小部分励磁电流分量,该文提出串联变压器励磁电流补偿(magnetizing current compensation,MCC)的方法。对比仿真结果显示MCC可提高负载电压的精度,并且验证了控制方法的有效性和实验的可行性。
Based on the rated voltage required for normal operation of the load, this paper discusses the control of the secondary side of the series transformer operating current to restrict the load current, so that the load voltage is constant. This paper improves the speed and accuracy of the load current tracking rated current by using the perioda verage model (PAM), and accelerates the dynamic response of the dynamic voltage restorer (DVR) system. Considering a small part of the excitation current component in the load current, this paper presents a method of series magnetizing current compensation (MCC). The simulation results show that the MCC can improve the accuracy of the load voltage, and verify the effectiveness of the control method and the feasibility of the experiment.