电压畸变时电容耦合型动态电压恢复器控制

Control of Capacitor-coupled Dynamic Voltage Restorer With Distorted Voltage Source

电容耦合型动态电压恢复器(DVR)因其性价比高的优势而广泛应用于配电网中,但在电网电压畸变时,补偿效果较差。为了获得DVR更高质量的电压补偿效果,此处研究了一种基于准比例谐振(PR)控制器的双闭环控制策略,以消除电网电压畸变所带来的影响,在补偿电压暂降、暂升基础上,还可实现对电网电压谐波的补偿。在分析电容耦合型DVR工作原理基础上,明确了系统控制策略的实现方式,并搭建实验平台进行验证。

Capacitor-coupled dynamic voltage restorer(DVR)has already been widely applied to distribution network due to its high performance-price ratio.However,the compensation performance is poor if the distorted voltage source exists.Hence,in order to achieve better voltage compensation performance of DVR,the double closed-loop control strategy based on quasi proportional resonance(PR)controller is proposed to eliminate the effect of distorted voltage source,where voltage sag,swell and voltage source harmonics are compensated.The operating principle of capacitorcoupled DVR is analyzed,and the implementation method of system control strategy is clarified.The control method is verified through experimental platform.