摘要
当网侧电压跌落时,传统PI控制无法满足L型并网逆变器须要大幅调节电流的要求。文章采用模型预测控制方法实现电流快速跟踪性能,将多步模型预测控制应用于光伏发电并网逆变器电流PI控制中,解决了传统模型预测存在的周期延时问题,使电流的跟踪精度得到改善。将文章所提控制策略在PSCAD/EMTDC中进行仿真和实验,所提方案可以使光伏发电场站具备低电压穿越能力,并为并网点提供更多电压支持快速跟踪目标电流减少逆变器输出电流畸变。
When voltage sags occur on the grid side,in order to keep the photovoltaic unit using the L grid-connected inverter model off-gid and help the system maintain volage and frequency stability,it is necessary to carry out the low voltage traversal Performance Research of photovoltaic power generation system.Current PI control of traditional grid-connected inverters can not meet the characteristics of large current regulation under voltage sags.In this paper,model predictive control method is used to achieve fast current tracking performance.Aiming at the periodic delay problem of traditional model prediction,multi-step model predictive control is applied to current PI of grid-connected photovoltaie inverters.In the control,the tracking accuracy of the current is improved.Through PSCAD/EMTDC simulation and experiment,it is verified that the proposed control strategy can make the photovoltaie power station have low voltage traversing ability and provide more voltage support for grid-connected points.The proposed control strategy can track the target current quickly and reduce the distortion of the output current of the inverter.
作者
魏斌
王薇
王加祥
危波
Wei Bin;Wang Wei;Wang Jiaxiang;Wei Bo(Basic Depatment of Air Force Engineering University,Xi'an 710051,China;College of Aeronautical Engineering,Air Force Engineering University,Xi'an 710051,China)
出处
《可再生能源》
CAS
北大核心
2020年第10期1375-1381,共7页
Renewable Energy Resources
基金
国家自然科学基金项目(60975013)。
关键词
L并网逆变器
光伏发电单元
低电压穿越
多步模型预测
L grid-connected inverters
photovoltaic units
low voltage traversal
multi-step model prediction
