具有死区效应的光伏逆变系统积分滑模控制

Integrated Sliding Mode Control of Photovoltaic Inverter System with Dead-zone Effect

并网逆变器死区会降低输出电压波形质量,同时也会对负载和电网造成不同程度的影响。为减小死区效应及外部干扰对逆变器输出性能的影响,提出了一种具有死区效应的光伏逆变系统积分滑模控制策略。对死区机理进行分析,并建立逆变器数学模型;构造带有比例积分项的抗扰动状态观测器,对干扰状态进行有效估计;结合矢量控制构建一类非奇异终端滑模控制器,采用Lyapunov函数证明系统的渐进稳定性。最后,通过仿真验证了所提控制方法的有效性。

Dead zone of grid-connected inverter will reduce the quality of output voltage waveform and affect load and power grid in different degrees.In order to reduce the influence of dead zone effect and external disturbance on the output performance of photovoltaic inverter,an integral sliding mode control with dead zone effect was proposed.Dead zone mechanism was analyzed,considering the dead zone to establish the inverter mathematical model.An anti-disturbance state observer with proportional integral term was constructed to estimate the disturbance state effectively.A class of non-singular terminal sliding mode controller was constructed with vector control,and the asymptotic stability of the system was proved by Lyapunov function.Finally,the effectiveness of the proposed control method was verified by simulation.