带Z源网络的动态电压恢复装置研制

Development of dynamic voltage recovery device with Z source network

针对微电网电压瞬变引发的电能质量下降问题,设计一种基于简化情感控制、带Z源网络的动态电压恢复器(DVR)。设计了Z源动态电压恢复器的硬件结构;分析了Z源网络扩大电压补偿范围的原理;设计了一种基于简化情感控制、带电压前馈的DVR控制系统,利用简化情感控制模型既具有PI控制结构,又能通过自学习进行参数自动修正的特点,提高了DVR的控制速度和补偿精度。为验证所提DVR方案的可行性,进行了建模仿真及实验验证,结果表明,与基于PI控制和模糊控制等方法的DVR相比,基于简化情感控制的Z源动态电压恢复器具有响应速度更快、电压补偿范围更宽、补偿精度更高的特点以及较好的稳定性。

A Z-source dynamic voltage restorer(DVR)based on simplified emotion control was designed for power quality degradation caused by microgrid voltage transients.The hardware structure of the Z-source dynamic voltage restorer was designed.The principle of expanding the voltage compensation range of Z-source network was analyzed.A DVR control system based on simplified emotion control and voltage feedforward was designed.The control speed and compensation precision of DVR were improved by using the simplified emotion control model,which has the characteristics of PI control structure and automatic correction of parameters through self-learning.In order to verify the feasibility of the proposed DVR scheme,modeling simulation and experimental verification were carried out.The results show that compared with DVR based on PI control and fuzzy control,the Z-source dynamic voltage restorer based on simplified emotion control has the characteristics of faster response speed,wider voltage compensation range,higher compensation accuracy and better stability.