基于模糊控制的虚拟同步发电机并网策略研究

摘要

Based on the control of three-phase inverter based on virtual synchronous generator,the double loop control system was composed of capacitor voltage and current feedback.Among them,the current loop and voltage loop were proportional integral control.However,the traditional double loop control had such shortcomings as low precision and slow response speed,The whole fuzzy control system had the function of adjusting the parameters according to the nonlinear system error of the system.On the basis of this,a control strategy of virtual synchronous motor based on the combination of double loop control and fuzzy PI was proposed.A detailed analysis of the fuzzy parameters after loop control setting,effectiveness and the method was proved by simulation research.%在基于虚拟同步发电机三相逆变器控制的基础上,利用电容电压和电流反馈,构成双环控制系统.其中,电流环和电压环都采用比例积分控制.但是,传统的双环控制存在精度不高且响应速度较慢等缺点,而模糊控制具有根据系统实时性产生的非线性系统误差的大小,进行在线调节参数的功能.在此基础上,提出了一种基于双环控制和模糊PI相结合的虚拟同步电机控制策略,并搭建了相应的模型.详细分析了加入模糊之后双环控制的参数整定,并通过仿真研究来证明所提方法的有效性.