基于PI调节器的软件锁相环方法及应用

Phase Locked Loop Method and Application Based on PI Regulator Software

介绍了一种用于PWM整流器的软件锁相环方法,采用基于坐标变换及参考模型自适应控制的软件锁相环技术,将三相电压变换到以角频率ω_0为旋转角速度的旋转dq坐标系下电压U_d,U_q,令dq坐标系下的虚轴分量为零,则ω_0可以跟随电网电压角频率ω_C,从而实现与电网电压同步锁相。通过样机测试,验证了所用软件锁相环方法的快速响应和较好的鲁棒性,证实了该方法的可行性,在工程应用上有实用价值。

This paper describes a method suitable for the software phase locked loop PWM rectifier based on coordinate transformation and model reference adaptive control software PLL technology, which can be used to transform the three-phase voltage into angular frequency coo for the rotational angular velocity of the rotating dq coordinate system voltage Ud, Uq, so the imaginary axis component of the dq coordinate system is zero, then ω0 can follows the grid voltage angular frequency ωc, so that the gen lock is enabled to be synchronous with phase lock of the grid voltage. Through prototype testing, it is verified that the phase locked loop tech- nique has the characteristics of rapid and robust response and its feasibility and practical value are confirmed in the engineering appli- cation.