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为了提高基于同步参考坐标系的单相软件锁相环在电网谐波畸变情况下的性能,提出了一种基于双滑动平均滤波器的单相软件锁相环。该锁相环采用双滑动平均滤波器来滤去同步坐标系中dq轴上由单相电压奇次谐波转化而来的4k+4(k=0,1,2,…)次谐波,以得到用来锁相的基波相位。考虑到单相电压频率变化会造成锁相环的锁相误差,先采用角频率重构模块得到变化后的频率,再利用加权平均值法来减小频率变化对所述锁相环滤波部分的误差。实验结果表明,该锁相环可以在单相电压含有谐波和频率变化的情况下准确得到基波的幅值和相位,并具有良好的动态响应特性。
In order to improve the performance of phase-locked loop with single-phase software based on synchronous reference frame in power system harmonic distortion, a single-phase software phase-locked loop based on double-sliding average filter is proposed. The phase-locked loop uses a double-sliding average filter to filter out the 4k + 4 (k = 0, 1, 2, ...) subharmonic on the dq axis from the single-phase voltage odd harmonics in the synchronous coordinate system, To get the phase of the fundamental used to phase lock. Taking into account the single-phase voltage and frequency changes will cause phase-locked loop phase-locked loop error, the first use of angular frequency reconstruction module to get the changed frequency, and then use the weighted average method to reduce the frequency changes of the PLL filter part of error. The experimental results show that the PLL can accurately obtain the amplitude and phase of the fundamental wave when the single-phase voltage contains harmonic and frequency changes, and has good dynamic response characteristics.