摘要
针对传统滑模MPPT控制策略在光伏最大功率点追踪技术中存在跟踪电压误差、抖振等问题,通过对比分析传统滑模MPPT控制策略的不足,针对性地提出一种边界层可变的滑模控制策略。该策略通过建立一种改进饱和函数幂次趋近律,利用幂次函数的快速收敛性与改进饱和函数边界层内自适应调整的特点,由边界层厚度表达式控制系统位置误差,并在趋近过程的不同阶段建立分段调节策略,使得边界层内初始状态点运动至滑模控制的平衡点,实现光伏系统最大功率点的精确追踪。最后通过Matlab/Simulink模块进行仿真并搭建试验平台进行验证,结果表明,采用边界层可变的滑模MPPT控制策略能够实现光伏最大功率点的精确追踪,且在较大扰动影响下,仍能实现快速追踪且平滑输出最大功率。
In response to the shortcomings of traditional sliding mode MPPT control strategy in photovoltaic maximum power point tracking technology,such as tracking voltage error and chattering,compares and analyzes the shortcomings of traditional sliding mode MPPT control strategy,and proposes a targeted sliding mode control strategy with variable boundary layer.An improved saturation function power-law approach law is established,utilizing the fast convergence of the power-law function and the adaptive adjustment characteristics within the improved saturation function boundary layer.The system position error is controlled by the boundary layer thickness expression,and a segmented adjustment strategy is established at different stages of the approach process,so that the initial state points in the boundary layer move to the equilibrium point of sliding mode control,achieving accurate tracking of the maximum power point of the photovoltaic system.Finally,simulation is conducted using Matlab/Simulink and an experimental platform is built for verification.The results show that the use of a sliding mode MPPT control strategy with variable boundary layers can achieve accurate tracking of the maximum power point of the photovoltaic system,and even under large disturbances,it can still achieve fast tracking and smooth output of the maximum power.
作者
巫庆辉
周子媛
于文瑞
鲍亚庆
黄旭
WU Qinghui;ZHOU Ziyuan;YU Wenrui;BAO Yaqing;HUANG Xu(Faculty of Electrical and Control Engineering,Liaoning Technical University,Huludao 125100)
出处
《电气工程学报》
CSCD
北大核心
2024年第4期326-336,共11页
Journal of Electrical Engineering
基金
辽宁省教育厅重点攻关(LZ2020001)
煤炭行业教学研究(2021MXJG200)资助项目。
关键词
光伏电池
滑模控制
饱和函数幂次趋近律
边界层厚度
Photovoltaic cells
sliding mode control
saturated power reaching law
boundary layer thickness
