摘要 针对独立运行的光伏发电系统,该文提出了基于状态反馈精确线性化解耦的光伏逆变器滑模控制策略,实现了负载波动条件下系统输出电压稳定控制。在光伏微源输出最大功率跟踪控制前提下,首先通过混合储能控制实现了逆变器输入侧直流母线电压稳定控制;为进一步提高孤岛系统输出电压的稳定性,满足电压快恢复、抗干扰的要求,针对系统耦合度高、非线性强的特点,采用反馈线性化进行精确解耦,并对解耦后的系统设计滑模控制律。最后,通过Matlab/Simulink对提出的控制策略进行仿真验证。研究结果表明光伏微源输出功率波动条件下,所提出的混合储能控制策略能平抑逆变器输入侧直流电压波动,滑模控制器能稳定逆变器输出电压,确保系统安全可靠运行。 A sliding mode control strategy based on state feedback precise linear decoupling is proposed for the island photovoltaic(PV)power generation system,which can realize the output voltage stability control under the condition of load fluctuation.Under the premise of maximum power point tracking control of PV microsource output power,the voltage stability control of DC bus at input side of inverter is realized by hybrid energy storage control;In order to further improve the stability of the output voltage of the islanded system,meet the requirements of fast voltage recovery and anti-interference,aiming at the characteristics of high coupling degree and strong nonlinearity of the system,the feedback linearization is used for accurate decoupling,and the sliding mode control law is designed for the decoupled system.Finally,the proposed control strategy is simulated and verified by Matlab/Simulink.The results show that the proposed hybrid energy storage control strategy can stabilize the DC voltage fluctuation at the input side of the inverter,and the sliding mode controller can stabilize the output voltage of the inverter and ensure the safe and reliable operation of the system.
机构地区 兰州理工大学电气工程与信息工程学院
出处 《自动化与仪表》 2021年第4期30-34,56,共6页 Automation & Instrumentation
关键词 光伏发电系统 状态反馈线性化 滑模控制 photovoltaic power generation system state feedback precise linear sliding mode control
分类号 TM464 [电气工程—电器]
