摘要
针对光伏发电系统的随机性、间歇性、波动性以及独立运行对负荷投切敏感等技术问题,分析了光伏发电的基本原理、建立了相关数学模型、推导了光伏发电系统出力波动与直流母线电压的解析关系。在充分考虑功率型及能量型两类储能特性的基础上,提出了采用超级电容、蓄电池混合储能平抑负荷功率波动的技术方案,应用改进下垂控制理论与电压前馈校正算法提高了负荷功率波动的补偿精度,实现了光伏微网的源-荷-储协调优化控制,较好地解决了网内功率平衡问题。采用Matlab/Simulink平台搭建的数字化仿真研究结果表明所研究控制策略可行、有效。
In view of the technical characteristics of photovoltaic(PV)power generation system such as randomness,intermittency and volatility as well as the sensitivity of load switching at standalone runtime,this paper analyzes the basic principles of PV power generation,establishes the relevant mathematical model,and deduces the analytical relationship between the output fluctuation of PV power generation system and the DC bus voltage.And then on the basis of taking full account of two types of energy storage characteristics:power type and energy type,the paper puts forward the technical scheme of using the hybrid energy storage of super capacitor and battery to suppress the power fluctuation of load,which scheme applies the improved sagging control theory and voltage feedforward correction algorithm to improve the compensation accuracy of load power fluctuation,realizes the coordinated optimization control of source-load-storage of PV micro-grid,and achieves the power balance within the grid.The results of digital simulation based on Matlab/Simulink platform show that the proposed control strategy is feasible and effective.
作者
张继红
兰永健
赵锐
赵继勇
杨培宏
吴振奎
ZHANG Jihong;LAN Yongjian;ZHAO Rui;ZHAO Jiyong;YANG Peihong;WU Zhenkui(Autonomous Region Key Laboratories of Photothermal and Wind Power Generation,School of Information Engineering,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China;Inner Mongolia Shenyuan Construction Co.,Ltd.,Baotou Inner Mongolia 014030,China)
出处
《湖北电力》
2021年第2期56-63,共8页
Hubei Electric Power
基金
内蒙古自治区关键技术攻关项目(项目编号:2019GG319)
内蒙古自治区自然科学基金项目(项目编号:2019MS05047)。
关键词
光伏发电
直流微网
超级电容
蓄电池
协调控制
PV power generation
DC micro-grid
super capacitor
battery
coordinated control
