模块化多电平有源滤波器控制策略研究

Control Strategy Study on MMC Active Power Filter

为了增大有源滤波器(APF)的容量,利用了模块化多电平(MMC)型变流器具有耐压等级高和等效频率高的特点,提出了一种三相二十四模块的有源滤波器控制算法。该算法设计了电容电压控制策略,保证子模块电容电压稳定;同时根据模块化多电平换流器特点,设计电压间接控制算法使得APF输出i_p-i_q法检测的补偿电流,从而保证系统侧电流为基波正序电流。该方法控制简便,易于实现,Matlab/Simulink仿真实验证明了其有效性。

For the increase of capacity of active power filter（APF）and with the use of such feature of MMC converter as high withstand voltage grade and equivalent frequency,a kind of control method of MMC active power filter with twenty-four modules in three phases is designed,which designs the control strategy of capacitive voltage and assures stability of the capacitive voltage of the sub-model. At the same time,the indirect control algorithm of voltage is designed in accordance with the features of MMC so to keep the APF output the compensation current which is detected by ip-iq method and thus assures the current at the system side is fundamental positive sequence current. The method is simple in the control and is easy to achieve and its effectiveness is verified by the Matlab/Simulink simulation test.