基于EMAF的新型电力系统电压畸变工况下并网逆变器快速锁相方法

为了提高新型电力系统电压畸变工况下电压信号同步相位的检测精度，提出了一种基于增强型滑动平均滤波（EMAF）算法的快速锁相算法。首先使用dq旋转坐标变换获得直流电压信号；然后利用EMAF算法滤除谐波、负序分量及噪声；最后，通过数学推导公式获得并网同步信息，实现并网逆变器的高性能控制。该算法无需复杂的锁相闭环回路，即可实现同步相位和电压幅值的快速检测，消除电网电压幅值、相位和频率跳变对正序分量提取的影响，具有较强的适应新型电力系统畸变环境的能力。仿真结果验证了所提算法的正确性和有效性。

Fast Phase Locking of Grid-connected Inverters under Distorted Voltage in New Power System Based on EMAF

In order to improve the detection accuracy of voltage phase synchronization under distorted voltage in new power system， the paper proposes a fast phase locking algorithm based on enhanced moving average filter （EMAF） algorithm. Firstly， this algorithm uses the dq frame transformation to obtain the DC voltage signal， and then uses the EMAF algorithm to filter out harmonics， negative sequence component and noise. Finally， the grid-connected synchronization information is obtained by mathematical formulas to realize the high-performance control of grid-connected inverters. The algorithm can realize the rapid detection of the synchronization phase and voltage amplitude without the phase-locked closed-loop. Simultaneously， the algorithm can eliminate the influence of the voltage amplitude， phase and frequency jumping on the extraction of positive sequence component， and has a strong adaptation to the new power system environment distortion. The simulation results verify the correctness and effectiveness of the algorithm.