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针对滞环电流控制开关频率不固定、频率范围大从而产生较大损耗的问题,以提高控制精度、减少开关损耗为目标,提出一种有源电力滤波器随机变环宽滞环电流跟踪控制方法。该方法针对电力系统负荷的特点,产生预置变环宽函数,能够较合理地给出滞环宽度,并引入随机函数,将开关频率范围拉宽,使电流频谱分布范围更宽,从而降低谐波畸变率,减少开关损耗。仿真及实验结果均证明了其可行性,可在保持总控制精度的同时有效降低总开关损耗,同时具有良好的补偿性能。
Aiming at the problem that the switching frequency of the hysteresis current control is not fixed and the frequency range is large, a large loss is generated. In order to improve the control accuracy and reduce the switching loss, a method of random variable-loop hysteresis current tracking control of active power filter . According to the characteristics of power system load, this method generates pre-set variable loop width function, which can give hysteresis width reasonably and introduce random function to widen the switching frequency range and widen the current spectrum distribution, thus reducing harmonic Wave distortion rate, reducing switching losses. Simulation and experimental results have proved its feasibility, while maintaining the overall control accuracy while reducing the total switching loss, and has good compensation performance.