逆变器作为微网光伏发电系统的接口,其控制策略直接影响到并网系统的稳定性.当并网逆变器采用LCL滤波器并网时,系统稳定性易受内部、外部参数的影响.针对高阶并网逆变器存在的扰动问题,文章设计了一种基于加权平均电流控制(Weighted Average Current Control,WACC)的自抗扰控制器.基于WACC控制原理将系统由三阶降为一阶,同时将逆变器系统的内部、外部扰动视为单一结构的广义扰动,采用控制律对闭环系统进行参数调节.最后,通过仿真和实验验证了该控制策略的有效性.
LADRC controller design of three-phase photovoltaic grid-connected inverter based on WACC
As the interface of micro-grid photovoltaic power generation system,inverter control strategy directly affects the stability of grid-connected system.The stability of grid-connected inverter is easily affected by the internal and external parameters of the system,especially when the grid-connected inverter adopts LCL filter,the design and operation conditions of the system become more and more complex.In this paper,an active disturbance rejection control strategy based on weighted average current is proposed to solve the disturbance problem of high-order grid-connected inverter system.Firstly,based on the WACC control principle,the system is reduced from third order to first order.At the same time,the internal and external disturbances of the inverter system are regarded as generalized disturbances of a single structure,and the control law is used to adjust the parameters of the closed-loop system.Finally,the effectiveness of the control strategy is verified by simulation and experiment.
photovoltaic power generationgrid-connected inverterWACCLADRC
万方数据
维普
