三相单开关功率因数校正器的谐波注入法

The Harmonic Injection Method for Single-Switch Three-Phase Power Factor Correction Circuits

被研究电路简单而实用 ,工作于固定占空比就能实现功率因数校正 ,不过这种情况下 ,输入电流含较多的 5、7和 11次谐波。往占空比注入 6倍次谐波 ,能显著减小谐波 ,但确定各谐波的注入量是个难点。采用多种算法 (含遗传算法 )对谐波注入系数进行了优化。经对比可知 :最简单迅速的方法是一维搜索 ;各次谐波的注入系数和输入电压幅值有关 ,只注入 6次谐波效果还不够理想 ;此外 ,所给优化结果是这种电路所能达到的最佳效果。

Single switch three phase Power Factor Correction(PFC) Circuit is simple and practical, it can achieve PFC by operation under fixed duty cycle. Six order harmonic injection is a method to reduce harmonic of average input current of this topology, but the harmonic injection coefficients are difficult to decide. Several methods, including the Genetic Algorithm(GA), are applied for optimizing. By comparison, it is found that: a) modified one dimension optimization is the best one, b) the injection coefficient depends on the amplitude of input voltages and it is not enough that only the six order harmonic is injected; and c) the result given in this paper is the “most” optimum one for this topology.