错时采样空间矢量调制的级联型多电平变流器及其在并联有源电力滤波器中的应用

介绍了错时采样空间矢量调制的基本原理,讨论了组合变流器与级联型多电平变流器的等价关系,提出了错时采样空间矢量调制在级联型多电平变流器中的实现方法,并进行了实验验证.给出了基于错时采样空间矢量调制级联型多电平变流器的并联电力有源滤波器的拓扑结构,设计了其交、直流控制系统,并以仿真和实验结果加以验证.仿真和实验结果表明,基于错时采样空间矢量调制级联型多电平变流器的并联有源滤波器可以在较低的开关频率下准确、有效地补偿负载谐波和无功功率.

Cascade Multilevel Converter Based on Sample Time Staggered Space Vector Modulation and Its Application to Shunt Active Power Filter

Sample Time Staggered Space Vector Modulation (STS-SVM) is a novel switch modulation strategy fit for large capacity power electronic equipment. The principle of STS-SVM is introduced. The equivalent relationship between multi-modular converters and cascade multilevel converters was discussed. The implementation method of STS-SVM used in cascade multilevel converters was presented with experimental verification. The advantages over other modulation strategies of STS-SVM are discussed. Combining the advantages of STS-SVM and cascade multilevel converters, a shunt active power filter with STS-SVM based cascade multilevel converters was proposed. Its control system of both AC side and DC side was designed. Simulation and experiment results indicate that the shunt active power filter with STS-SVM based cascade multilevel converters, which is of fast dynamic response, can compensate load harmonics and passive power precisely and efficiently at lower switch frequency.