三相光伏逆变器软启动改进模糊控制研究

Soft Start of Three-phase Photovoltaic Inverter Based on Modified Segmentation Fuzzy Control

针对三相光伏逆变器软启动过程中超调量大和调节时间长等问题,提出一种改进型模糊比例积分微分(PID)控制策略。结合逆变器启动特点,设计了改进型模糊PID控制器参数的整定原则,在偏差和偏差变化率作为模糊推理输入的基础上引入启动斜坡函数完成度,提高了逆变器启动过程动态和稳态性能,缩短了调节时间,并减小了超调量。通过仿真和实验验证了算法的可行性和有效性。

The soft start method of three-phase photovoltaic inverter has the deficiency such as large overshoot volume and long adjustment time.Aimed at this situation, a modified fuzzy proportional integral differentiation（PID） control strategy is proposed.According to the characteristics of the soft start, a modified fuzzy PID controller parameter setting principle is derived which adding the completion of the ramp function to fuzzy inference engine with the error and error rate,to make the dynamic and steady-state performances of the soft start method superior,shorten the ad-justing time greatly ,eliminate the overshoot volume.The simulation and experimental results verify the feasibility and effectiveness of the proposed method.