低开关损耗有源电力滤波器的滞环电流控制

提出了一种调节滞环宽度、减少有源电力滤波器(APF)的开关损耗的方法.通过比较有源电力滤波器的各相输出参考电流,来调整各相的滞环宽度,以降低开关损耗较大的相的开关动作次数,同时提高开关损耗较小的相的开关动作频率,从而在保持总的控制精度的同时,降低总的开关损耗.该方法只需加入一个调整电路,即可明显降低有源电力滤波器的开关损耗.用电磁暂态程序进行的计算机仿真结果表明,该方法可在控制精度和开关频率基本相同的情况下,将有源电力滤波器的开关损耗降低10%以上,而且各相开关的温升也更加平稳.

Hysteresis Current Control of Active Power Filter with Low Switching Loss

Proposed in this paper is a new method to reduce the switching loss of active power filter (APF) through adjusting the hysteresis band width.In this method, the hysteresis band width of each phase of APF is adjusted according to the output reference current, and the switching number of the phase with high switching loss is reduced while that of the phase with low loss is increased.Thus, the total switching loss is decreased without reducing the overall control precision.Only an adjusting circuit may significantly decrease the switching loss.Computer simulation with the electromagnetic transient program shows that, by using the proposed method, the switching loss of APF decreases by more than 10%, the temperature rise of each phase switch becomes smoother, while the control precision and switching frequency are almost unchanged.