摘要
针对三相锁相环(PLL)算法易受三相电压不平衡与谐波影响的情况,提出了一种新型基于固定角速度同步参考坐标系(SRF)的三相PLL算法。该算法是一种开环算法,它通过建立角速度固定的SRF,将三相电压信号转换为d,q向量,之后依据该向量与d坐标轴之间的角度得到三相电压的相位信息。该方法能在输入信号幅值、相位发生变化及频率产生偏差的情况下,实时且精确地检测到相位角信息。此外,为克服三相电压不平衡与谐波对锁相性能的干扰,采用滑动滤波器算法对d,q向量进行滤波处理,之后再求取输入信号的相位信息。最后仿真与实验证明了该算法在三相电压发生幅值、频率、相位突变及三相电压不平衡且含有谐波等情况下的有效性。
This paper presents a novel phase locked loop （PLL） algorithm for throe-phase networks which is a kind of open-loop method.A fixed angular speed synchronous reference frame （SRF） is established.The three-phase voltages are transformed into a d, q vector under the particular reference frame and through calculating the angle between the vector and the d axis, the phase information of the input signals can be derived.In scenarios of phase jump, magnitude jump and frequency deviation, it can capture the accurate phase angle in real-time.To overcome the unbalance and harmonies,moving average filters are integrated.Simulation results based on Matlab/Simulink and experiment are provided to validate the performance of the proposed algorithm.
出处
《电力电子技术》
CSCD
北大核心
2016年第4期86-88,共3页
Power Electronics
关键词
锁相环
同步参考坐标系
三相不平衡
谐波
phase locked loop
synchronous reference frame
three-phase unbalanced
harmonics
