面向中压配电网的电力电子变压器控制策略研究

为实现电力电子变压器在电力系统中保证各环节稳定工作以及良好的电能质量,根据电力电子变压器的自身特点,采用分级策略控制其运行工作,输入级与隔离级分别采用电压电流双闭环和电压闭环控制,用以稳定后逆变器的直流电压;输出级采用电压单闭环控制和恒频恒压(V/f)控制。搭建了基于Matlab/Simulink的三级电力电子变压器中压配电仿真系统,通过仿真实验验证了PET在两种控制策略下都能够输出稳定的三相电压电流,同时有效减少了谐波污染;对比不同控制策略下系统各环节的波形变化情况,对电力电子变压器在中压配电网的工程应用具有一定参考价值。

Research on power electronic transformer control strategy for medium voltage distribution network

Power electronic transformer is a new type of intelligent transformer which combines power electronic devices with high-frequency transformer. It will be the main power conversion and control link in the future distribution network,and it is also the key technology to realize the controllable ability of intelligent distribution network. This paper introduces the topological structure and working principle of power electronic transformer,according to the characteristics of power electronic transformer itself,a three-stage power electronic transformer simulation system based on Matlab/Simulink is established, and its operation is realized under two output control strategies.The waveform of each part of the system under different control strategies are compared. It has some reference value for the engineering application of power electronic transformer in medium voltage distribution network.