基于分层控制的级联 H桥型APF直流电容电压平衡控制策略

摘要

With respect to DC-side capacitor voltage balance,a very important aspect of research on cascaded H-bridge inverter topology and the key technology for safe and reliable operation of the device,an improved active voltage vector superposition method is proposed based on the framework of hierarchical control.According to this strategy,active DC component and active power voltage vector are added to the upper and the lower layer respectively,and the DC-side voltage is finally balanced through regulation of the instantaneous active power absorbed by the single-stranded joint.Simulation results show that DC-side voltage imbalance is thus solved and good dynamic response is acquired.%直流侧电容电压均衡一直是级联H桥型变流器拓扑研究很重要的一方面，也是装置安全可靠运行的关键技术。在分层控制的架构上，提出了改进的有功电压矢量叠加法。上下层分别叠加有功直流分量和有功电压矢量，最终对单链节吸收的瞬时有功功率进行调节来实现直流侧电压平衡。仿真结果表明，采用上述的控制方法，直流侧电压不平衡问题得到了很好的改善，且具有良好的动态响应特性。