基于PWM整流器的无功补偿容量整定方法

Reactive power compensation capacity tuning method based on PWM rectifier

为了充分利用PWM整流器的容量,实现对电网无功功率的调节及电网电压的稳定控制,深入分析了一种基于PWM整流器的无功补偿容量整定方法。重载情况下,PWM整流器在其容量范围内向电网不补偿或少量补偿无功功率,无功功率补偿量由PWM整流器的额定容量和直流负载功率共同决定;轻载情况下,PWM整流器能够补偿电网所缺的所有无功功率。文章还详细分析了直流电容参数的选取方法。最后通过MATLAB/Simulink仿真进行了验证,仿真结果表明该整定方法能够实现无功功率的动态补偿。

In order to fully employ the capacity of the PWM rectifier , and realize the regulation of reactive power and the stable control of voltage in the grid , a deep analysis of a reactive power compensation capacity tuning method based on PWM rectifier has been presented in this paper .In heavy load situations , the PWM rectifier does not com-pensate or compensate a small amount of reactive power , that is to say , the reactive power compensation amount is de-termined by the rated capacity of the PWM rectifier and the DC load power;in light load situations , the PWM rectifier can compensate the whole reactive power in the grid .This paper also analyzes the selection method of the DC capaci-tor parameter in detail.At last, it validates the system through the MATLAB/Simulink, the simulation results show that the tuning method can realize dynamic reactive power compensation .