Improved permanent magnet synchronous motor phase-locked loop method

The invention discloses an improved permanent magnet synchronous motor phase-locked loop method. A permanent magnet synchronous motor grid-connected system has high technical requirements and the phase-locked loop (PLL) is one of the key technologies. A dual synchronization coordinate system decoupling software PLL based on a LES filter can accurately and quickly track the frequency and phase of a power grid, has a strong anti-interference ability whether in a grid balance or unbalanced state, and is successfully used in grid-connected field after permanent magnet synchronous motor soft start. 本发明公开的是种改进的永磁同步电机锁相环方法，永磁同步电动机并网系统有较高的技术要求，锁相环是其中关键技术之。基于LES滤波器的双同步坐标系解耦软件锁相环能够准确快速地跟踪电网的频率和相位，无论是在电网平衡或者电网不平衡的状态下都具有较强的抗干扰能力，并成功应用在永磁同步电动机软起动后并网领域。