组合多电平式APF直流侧电压平衡控制策略

H桥级联式多电平变流器用于有源电力滤波器(APF)时,H桥功率单元直流侧电容电压的平衡制约着系统补偿的性能.通过对应用两电平变流器或H桥级联式多电平变流器的APF的研究,提出了更有利于实现多电平APF直流侧电容电压平衡控制的组合式多电平变流器拓扑;以新的多电平拓扑为基础,提出了2电压环的直流侧电压控制策略,解决了多电平有源电力滤波器直流侧电压平衡问题.仿真实验证明,该组合式多电平变流器拓扑是有效实用的,直流侧电容电压平衡控制策略也具有良好的控制效果.

Combined Multi-level Inverter and DC Side Voltage Balance Control

When H bridge cascade multilevel converter type is used for Active Power Filter(APF),the performance of the system compensation is limited by the H bridge power unit of capacitor voltage balance.Through research on APF with two-level converter or H bridge cascade multi-level converter,this paper proposes a more conducive method to realize multi-level APF DC-link capacitor voltage balance control of the modular multi-level converter topologies.On the basis of the new multilevel topology,this paper proposes a dual voltage loop DC voltage control strategy,solving the multilevel DC-link voltage balance problem of APF.Simulation experiments show that the modular multilevel converter topology is effective and practical.DC-link capacitor voltage balance control strategy has good control effect.