功率因数矫正器自动控制系统的设计

Design of automatic control system for power factor

文中针对一种新型的控制方式—可预测占空比控制方法进行了详细的理论推导和仿真验证,针对功率因数变换器(PFC)电压外环进行建模并提供理论依据。该控制系统在一个线电压周期内的占空比均可以通过算法计算得出,该方案省去了电流内环的设计,解决了开关频率和采样频率之间的限制问题,运算量较传统控制方式大大减少,动态性能好,功率因数高。通过Matlab仿真实验结果分析,验证了算法的正确性,实现输入电流实时跟随线电压变化的理想控制效果,得到近乎为1的高功率因数。

In this paper,a new type of control algorithm,predictable duty cycle,is used to derive and provide a theoretical basis for the power out of the power factor converter（PFC）. The duty cycle of the control system in a line voltage cycle can be calculated by the algorithm,the program eliminates the design of the current loop,to solve the switching frequency and sampling frequency between the restrictions,the amount of computing than the traditional control Way to greatly reduce the dynamic performance,high power factor. The simulation results of Matlab are used to verify the correctness of the algorithm,realize the ideal control effect of the input current in real time and follow the line voltage,and get the high power factor of almost 1.