基于模糊自适应准PR控制的三相并网逆变系统锁相环研究

针对目前广泛应用的广义积分器锁相技术中PI调节无法做到无静差跟踪,影响锁相效果的问题,提出使用准PR控制取代PI控制作为环路滤波器对锁相环进行调节;同时引入模糊自适应控制器解决广义积分器参数、环路滤波器参数不能适应控制过程参数变化、扰动等不确定因素的问题。仿真结果和实验测试证明该改进方法有效提高锁相精度和抗干扰能力。

Three-phase grid-connected inverter system phase-locked loop study based on Fuzzy adaptive quasi-PR control

For the problem that the PI regulator in widely used generalized integrator phase-locked technology can not do no static error tracking, impacting the effect of phase-locked, this paper proposes to replace PI control with a quasi-PR control as loop filter to adjust phase-locked loop. Simultaneously leading into fuzzy adaptive controller solves the problem that generalized integral parameters, the loop filter parameters can not adapt to the disturbance and change of control process parameters and other uncertain issues. The simulation results and experimental tests show that the improved method is effective to improve the accuracy of phase-locked loop and the capability of anti-interference.