带谐波补偿功能的动态电压补偿器

根据传统静止坐标和d-q坐标关系推导出相应的静止坐标下的谐振控制器来检测出指定次数的谐波,应用这种静止坐标下的谐振控制器对指定次数的谐波电压进行闭环控制,简单地加到动态电压补偿器(dynamic voltage restorer, DVR)控制系统中以达到补偿谐波电压的目的,而对DVR的基本电压暂降补偿性能的影响很小,提高了DVR的效率。分析了该谐振控制器的幅频和相频特性,指出在将其加入DVR控制系统中进行谐波补偿时不会引起有功功率的流动,对直流侧能量的影响也较小。仿真验证了该控制器不会引起DVR直流侧的功率流向,并可消除绝大部分指定次数的谐波。

A Dynamic Voltage Restorer with Harmonic Compensation Function

According to the relation between traditional stationary coordinate and d-q coordinate, corresponding resonance controller under stationary coordinate is deduced to detect the harmonics of specified orders, using this resonance controller under stationary coordinate the close-loop control can be applied to harmonics of specified orders. Simply integrating this resonance controller with dynamic voltage restorer (DVR) system the compensation of harmonic voltage is realized, and the influence of resonance controller on DVR's basic compensation performance for voltage sag is slight, so the efficiency of DVR can be improved. The amplitude-frequency characteristic and phase-frequency characteristic of resonance controller are analyzed, it is pointed out that the flowing of active power will not occur while the resonance controller is added into the control system of DVR to compensate harmonics, and its influence on energy in DC side is slight too. Simulation results prove that the resonance controller will not cause the flowing of power in DC side, and can eliminate most harmonics of specified orders.