基于分数阶滑模控制的光伏并网模型预测直接功率控制  

Photovoltaic grid-connected model predictive direct power control based on fractional order sliding mode control

作　　者：张晓英[1] 游紫萱 罗童 张兴平 王晓兰[1] ZHANG Xiaoying;YOU Zixuan;LUO Tong;ZHANG Xingping;WANG Xiaolan(College of Electrical Engineering and Information Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu Province,P.R.China;Dingxi Power Supply Company of State Grid Gansu Province Electric Power Company,Dingxi 743000,Gansu Province,P.R.China)

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050 [2]国网甘肃省电力公司定西供电公司,甘肃定西743000

出　　处：《深圳大学学报（理工版）》2024年第6期669-678,共10页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(51867015);甘肃省科技重大专项计划资助项目(19ZD2GA003)。

摘　　要：针对外界扰动情况下的光伏并网模型预测直接功率控制(model predictive direct power control,MPDPC)系统中存在系统抖振、功率跟踪速度慢、并网电流总谐波失真率较高等问题,提出一种改进分数阶滑模电压控制器,该策略在直流侧母线电压外环采用了分数阶微积分理论.首先,构造分数阶非奇异快速终端滑模面函数,削弱系统抖振,提高系统动态性能;然后,构造分数阶双幂次指数趋近律,引入加权积分型增益和饱和函数,有效避免系统在非滑动模态阶段时切换增益的增大,提高系统控制精度;最后,设计新型分数阶电压环控制器并运用于光伏并网系统中.研究结果表明,改进后的分数阶滑模电压控制器能够满足光伏并网MPDPC系统的各项基本需求,抑制系统抖振,提高功率跟踪性能,降低并网电流总谐波失真率,有效解决可再生能源和公共电网电能转化的关键难题,对光伏并网系统高性能控制的理论研究具有重要意义.To address issues such as system jitter,slow power tracking speed,high total harmonic distortion rate of grid-connected currents in the photovoltaic(PV)grid-connected model predictive direct power control(MPDPC)system under the external perturbations,we propose an improved fractional-order sliding mode voltage controller.This strategy employs fractional-order calculus theory in the outer loop of the direct-current side bus voltage.First,we construct a fractional-order non-singular fast terminal sliding mode surface function to mitigate system jitter and enhance dynamic performance of the system.Next,we introduce a fractional-order double-power exponential convergence law along with a weighted integral-type gain and saturation function to effectively prevent the increase of switching gain when the system is not in the sliding mode phase,and thereby improving the accuracy of system control.Finally,we design a novel fractional-order voltage loop controller for use in the PV grid-connected system.The results show that the improved fractional-order sliding mode voltage controller can meet the basic requirements of PV grid-connected MPDPC system,effectively suppress the system jitter,improve the power tracking performance,reduce the total harmonic distortion rate of grid-connected current,and resolve key challenges in the conversion of renewable energy to public grid power.The designed controller is of great significance for the theoretical study of high-performance control strategies in the grid-connected PV systems.

关 键 词：电气工程 光伏发电 并网系统 分数阶微积分 滑模控制 模型预测直接功率控制 电压环控制器 

分 类 号：TM464[电气工程—电器] TM614