为了减小电网中非线性负载带来的谐波电流对电网质量的影响，针对基于H桥的有源滤波器装置中直流电容电压问题，提出一种新的控制方法。将控制模块分成模块均值电压控制器和直流母线电压控制器两个部分，通过调节每个H桥之间的有功功率交换和有源滤波器同电网间有功功率的交换来实现直流电容电压的平衡控制。利用该方法对八个单元H桥级联的并联型有源滤波装置进行Matlab/Simulink仿真，并基于FPGA+DSP实验平台搭建了三单元H桥级联样机。仿真和实验结果表明，基于级联多电平的有源滤波器直流侧电压平衡控制方法是有效和实用的。%In order to reduce the impact of the harmonic current caused by nonlinear load on grid quality, a novel control strategy is proposed for DC voltage balance control based on multi-level cascaded APF. The balance control is divided into two parts, namely module mean voltage controller and DC bus voltage controller. By adjusting the active power exchanges between each H-bridge and the active power exchange between active power filter and the grid, the DC capacitor voltage balance is achieved. With this method, an eight-unit cascaded H-bridge module is simulated on Matlab/Simulink, while a three-unit cascaded H-bridge prototype is built on the experimental platform based on FPGA+DSP. Simulation and experimental results show that the DC voltage balance control based on multi-level cascaded APF is valid and practical.
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