基于EIO光伏并网逆变器非奇异快速终端滑模控制设计

Design of fast nonsingular terminal sliding mode control for photovoltaic grid inverter based on EIO

为了减小外界干扰和系统参数的不确定性等因素对光伏并网逆变系统的影响,文章提出了基于非奇异快速终端滑模控制的光伏并网逆变器控制策略。设计了基于等价输入观测器的光伏并网逆变器干扰项补偿器,推导了在参数不确定和外界干扰情况下的逆变器的反馈控制律。仿真结果表明,采用扰动观测器与非奇异快速终端滑模控制相结合的策略,增强了系统的鲁棒性,提高了跟踪精确度,系统具有良好的动态性能。

In order to overcome the problems of photovoltaic grid-connected inverter system disturbed by external disturbance and system parameter uncertainties, the inverter state equation is established with the consideration of the disturbances. A control strategy of nonsingular fast terminal sliding mode control of photovoltaic grid connected inverter is proposed. The compensator of photovoltaic grid connected inverter based equivalent input disturbance observer is designed and the feedback control law under the external disturbance with uncertain parameters is derived. The simulation results show that the sheme combining disturbance observer and nonsingular fast terminal sliding mode control enhance the robustness and improve the tracking accuracy, the system has good dynamic performance.