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为提高同步坐标系锁相环在谐波畸变电网环境下的控制性能,提出一种基于频率自适应滤波器的同步坐标系锁相方法。用数学解析方法证明了所用频率自适应滤波器的时域稳定性,讨论了滤波器的参数对其动稳态性能的影响。同步坐标系锁相方法的设计中,采用频率自适应滤波器在静止坐标系中分离出电网信号的基波正序分量,并在同步旋转坐标系中抑制锁相环输入信号中的2次谐波分量。该文基于频率自适应滤波器设计的同步坐标系锁相方法,实现了对谐波畸变电网中电网信号基波正序分量的精确锁相,且具有较快的动态响应速度。仿真和实验结果验证了所提锁相方法的有效性和可行性。
In order to improve the control performance of the synchronous phase locked loop (PLL) in the harmonic distortion power network environment, a synchronization method based on frequency adaptive filter is proposed. The mathematic analysis method is used to prove the time-domain stability of the adaptive frequency filter used. The influence of the parameters of the filter on its dynamic stability is discussed. In the design of phase-locked system, the frequency adaptive filter is used to separate the fundamental positive sequence component of the grid signal in the stationary coordinate system and suppress the second harmonic in the input signal of the phase-locked loop in the synchronous rotating coordinate system Wave component. In this paper, based on the frequency-adaptive filter design of synchronous coordinate system phase-locked method, the phase-locked components of the fundamental signal of power system in the harmonic distortion power grid are accurately locked and have fast dynamic response. Simulation and experimental results verify the validity and feasibility of the proposed phase locking method.