摘要
针对传统光伏并网逆变器的非线性系统在扰动下难以实现功率平稳输出的问题,提出了一种基于改进粒子群算法的非线性滑模控制策略.根据光伏逆变器工作原理,建立了计及光照强度扰动的变换器模型,设计了一种扰动观测器对系统不确定扰动进行定量估计,实现了滑模面和滑模控制器对系统的控制,并利用改进粒子群算法对控制器参数进行优化.仿真结果表明,与传统控制策略相比,所提策略使动态曲线的衰减系数由-0.1变为-32.13,提高系统阻尼特性百余倍,具有良好的动态响应,验证了该策略的有效性与可行性.
In order to solve the problem that the nonlinear system of traditional photovoltaic grid-connected inverter is unable to achieve stable power output under disturbance,a nonlinear sliding mode control strategy based on improved particle swarm optimization algorithm was proposed.A converter model considering light intensity disturbance was established according to the working principle of photovoltaic inverter.A disturbance observer was designed to estimate the uncertain system disturbance quantitatively.In addition,the sliding mode surface and sliding mode controller were designed to control the system,and the improved particle swarm optimization algorithm was used to optimize the controller parameters.The simulation results show that the damping factor of the system decreases from-0.1 to-32.13,the effectiveness and feasibility of the strategy are verified by the hundredfold improvement of damping capacity and the favourable dynamic response,in comparison with the traditional control strategy.
作者
富璇
王黎明
王雪莹
张楠
刘颖明
FU Xuan;WANG Li-ming;WANG Xue-ying;ZHANG Nan;LIU Ying-ming(College of Information,Shenyang Institute of Engineering,Shenyang 110136,China;School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China;Relay Protection and Automation Department,State Grid Liaoning Electric Power Research Institute,Shenyang 110006,China)
出处
《沈阳工业大学学报》
CAS
北大核心
2022年第6期694-699,共6页
Journal of Shenyang University of Technology
基金
辽宁省教育厅科研项目(JL-1908)
国网辽宁省电力有限公司项目(SGTYHT/21-JS-226).
关键词
光伏并网逆变器
非线性系统
滑模控制
观测器
改进粒子群算法
photovoltaic grid-connected inverter
nonlinear system
sliding mode control
observer
improved particle swarm optimization
