基于主动阻尼电路的LCL型并联有源电力滤波器谐振抑制方法

SAPF Harmonic Detection Method Based on Triangle Orthogonal Principle

由于并联有源电力滤波器(SAPF)的宽控制带宽,LCL输出滤波器的谐振问题已经成为SAPF运行中的关键问题。为了解决LCL滤波器的谐振问题,提出了基于主动阻尼电路的新型阻尼方法,以在不影响SAPF控制的情况下实现阻尼效果。所提方法基于与滤波电容器串联的辅助变换器,在辅助变换器中,谐振电流被检测并反向注入作为变换器的参考信号,从而达到对谐振电流的阻尼效果。所提方法的稳定性通过频率响应分析,并与传统方法进行比较,证明了理论上的可行性。最后,实验结果验证了所提方法的有效性,与传统方法相比,所提方法具有更好的开关谐波抑制效果。

Due to the wide control bandwidth of the shunt active power filter(SAPF),the resonance problem of the LCL output filter has become a key problem of the SAPF.To solve the resonance problem of the LCL filter,a novel damping method based on active damping circuit was proposed to achieve the damping effect without affecting the SAPF control.The proposed method was based on an auxiliary converter connected in series with the capacitor branch of LCL filter.In the auxiliary converter,the resonant current was detected and injected inversely as the reference signal of the converter,to achieve the damping effect on the resonant current.The stability of the proposed method was carried out through the frequency response analysis,and compared with the traditional method,which proved the theoretical feasibility of the proposed method.Finally,the effectiveness of the proposed method was verified by the experimental results,and it has better switching harmonic suppression effect compared with the traditional passive damping method.