基于LCL滤波DVR补偿变压器漏抗的确定

Determining the leakage reactance of DVR compensation transformer based on LCL filter

针对动态电压恢复器(DVR)补偿变压器漏抗的选取尚无相应的国家标准,提出了将变压器的漏电感和桥臂侧的LC滤波组成LCL滤波器。根据LCL滤波器的设计要求,来确定变压器的漏抗及阻抗压降的方法,并结合DVR的特点分析了LCL滤波器各参数的选取原则。根据上述方法对容量为30 kVA的DVR进行电压跌落补偿仿真和实验,补偿后的电网电压谐波畸变率小于5%,证明了该方法满足性能指标。

The leakage reactance of the compensation transformer in Dynamic Voltage Restorer （DVR） has no corresponding national standards. The paper proposes the LCL filter composed of leakage inductance of the transformer and the LC filter at the arm side. According to the design requirements of LCL filter, the transformer leakage inductance and impedance voltage drop are determined, and the parameter selection principles of LCL filter are analyzed combined with the characteristics of DVR. Using the method, the simulations and experimental results of 30 kVA capacity of DVR voltage drop compensation demonstrate that the method can meet the performance indicators, and the harmonic distortion rate of gird voltage after the compensation is less than 5%.