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在有源电力滤波器中 ,直流电压的控制对其补偿效果有重要的影响。由于能量交换以及设备各部分的损耗 ,直流电压总是存在一定的能量脉动 ,恶化了谐波补偿效果 ,传统的增大电容器容量的解决办法增加了装置成本和安装空间。文中以并联有源电力滤波器为例提出一种改进的 PWM方法 ,采用前馈控制消除直流电压波动对变流器输出交流电压的影响 ,使有源电力滤波器获得了理想的补偿效果。仿真和试验结果证明了该方法的有效性。
In the active power filter, the control of DC voltage has a significant impact on the compensation effect. Due to the energy exchange and the loss of various parts of the equipment, the DC voltage always has certain energy pulsation, which deteriorates the harmonic compensation effect. The traditional solution to increase the capacity of the capacitor increases the installation cost and the installation space. In this paper, an improved PWM method is proposed by taking the parallel active power filter as an example. The feedforward control is used to eliminate the influence of DC voltage fluctuation on the output AC voltage of the converter, so that the active power filter can obtain the ideal compensation effect. Simulation and experimental results prove the effectiveness of this method.