光伏三相并网系统的自抗扰控制

Disturbance rejection controller for photovoltaic three-phase grid-connected system

光伏三相并网发电系统是一个典型非线性系统,受电网和外部环境的影响,系统存在许多不确定性干扰.本文以三相光伏并网发电系统为对象,利用自抗扰控制器的扩张状态观测器,对系统模型中的不确定因素和外部卜扰进行动态观测,设计一自抗扰控制器,使系统具有较好的适应能力,并对系统进行了仿真研究.结果表明所设计的控制器具有良好鲁棒性和较好的动、静态特性.

Photovoltaic（PV） system connected to the three-phase grid is a typical nonlinear system. Affected by the grid and the environment, there are many uncertain disturbance sources. To deal with the characteristics of the system, the extended state observer（ESO） for auto-disturbances rejection control（ADRC） is applied to measure the model uncertainty and external interference of the system, and an disturbance rejection control（ADRC） is applied to improve the system＇s performances. Simulation results show that the system has good robustness and desirable control effect. Furthermore, it could improve the dynamics and static performances of the system.