级联型有源滤波器均压控制方法的研究

Research on Voltage Equalization Control Method of Cascaded Active Power Filter

为了减小电网中非线性负载带来的谐波电流对电网电压的影响,针对级联H桥有源电力滤波器APF(Active Power Filter)直流侧电压失衡问题,提出了一种分层控制思想;顶层主要实现有功指令电流跟踪和相间电压的均衡,底层控制实现相内各H桥模块电压的均衡,有效解决相间电压和相内电压的均衡问题。使用仿真软件PSCAD/EMTDC初步实现了该控制策略的仿真验证,并基于DSP+FPGA为控制核心的实验平台搭建级联H桥样机。仿真和实验结果表明,级联型APF均压控制方法是有效的。

In order to reduce the impact of the harmonic current caused by nonlinear load on grid quality,a hierarchical control was proposed for DC side voltage imbalance problem on H-bridge APF. The top layer was mainly used to realize the equalization of the active command current tracking and the phase voltage,and the underlying control was used to achieve the voltage balance of each H-bridge module in one phase,which effectively solved the balance problem of voltage balance during three phases and voltage balance in one phase. The control strategy was preliminarily verified with PSCAD/EMTDC simulation software,while a cascaded H-bridge prototype was built on the experimental platform based on DSP ＋FPGA as the control core. Simulation and experimental results show that the voltage equalization control based on cascaded H-bridge APF is valid.