摘要
文章的光储微电网在并网和离网运行时,蓄电池前级采用恒压控制,后级分别采用PQ和V/f控制;光伏前级采用最大功率点跟踪或负载功率跟踪控制,后级采用PQ控制。并网切换至离网运行时,通过调节蓄电池的功率输出,减少流经静态开关点的电流,达到允许切换的阈值时进行切换。对蓄电池PQ和V/f控制结构进行改进,只切外环,共用内环,并对外环输出的电流参考值进行补偿,减小暂态冲击;离网切换至并网运行时,启动预同步控制,同时让蓄电池PQ控制中的有功功率参考值跟随蓄电池的功率输出,使其在切换前后电流参考值相同,以达到平滑切换的目的,最后通过Matlab软件仿真验证其可行性。
The microgrid with photovoltaic and energy storage runs in grid-connected or islanded operation mode,the front stage coverter of the battery adopts constant voltage control,and the last stage coverter adopts PQ or V/f control;the front stage coverter of the photovoltaic source adopts maximum power tracking or load power tracking control,and the last stage coverter adopts PQ control.The output power of the battery is adjusted to reduce the current flowing through the static switching point when microgrid is switched from grid-connected to islanded operation mode,switch action takes place when the threshold for allowing switching is reached.In order to reduce the transient oscillation during the switching process,the structure of the controller is improved only the outer loop is switched and the current reference value outputted by the outer loop is compensated;the pre-synchronization control is started when microgrid is switched from islanded to grid-connected operation mode,and the active power reference value in the battery PQ control follows the power output of the battery,so that the state before and after switching is the same,and then the purpose of smooth switching is achieved.Finally,the effectiveness of the control strategy is verified by simulation in MATLAB software.
作者
刘梦超
王生铁
温素芳
Liu Mengchao;Wang Shengtie;Wen Sufang(College of Electric Power,Inner Mongolia University of Technology,Hohhot 010080,China)
出处
《可再生能源》
CAS
北大核心
2020年第12期1633-1639,共7页
Renewable Energy Resources
基金
内蒙古自治区高等学校科学研究项目(NJZY18091)。
关键词
微电网
孤岛运行
并网运行
平滑切换
预同步控制
microgrid
islanded operation
grid-connected operation
smooth switching
pre-synchronization control
