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LCL型有源电力滤波器具有补偿带宽高和开关纹波含量低的优点,但由于LCL输出滤波器是3阶系统,在谐振频率处会产生谐振,使稳定控制比较困难。文章提出了一种基于无谐波检测技术的LCL型有源电力滤波器直接功率控制方法,将无谐波检测技术结合到LCL型有源电力滤波器直接功率控制中,该方法省去了复杂的负载谐波电流检测和补偿电流检测,具有良好的有源电力滤波器谐波补偿效果,同时采用直接功率控制提高了系统动态控制性能,此外为克服LCL滤波器谐振问题,在控制器中增加了有源功率阻尼环节。仿真试验结果证明了该方法的正确性和可行性。
The LCL active power filter has the advantages of high compensation bandwidth and low switching ripple content. However, since the LCL output filter is a 3-order system, resonance occurs at the resonance frequency, making stable control more difficult. In this paper, a method of direct power control of LCL active power filter based on non-harmonic detection technology is proposed. The non-harmonic detection technology is combined with the direct power control of LCL active power filter, which eliminates the complexity Of the load harmonic current detection and compensation current detection, with good active power filter harmonic compensation effect, while the use of direct power control to improve the system dynamic control performance, in addition to overcome the LCL filter resonance problem, increase in the controller Active power damping. Simulation results prove the correctness and feasibility of the method.