基于模糊下垂的微网系统频率及平滑切换控制研究  

Research on Frequency and Smooth Switching Control of Microgrid System Based on Fuzzy Droop Control

作　　者：徐琬琦 王鲁杨 柏扬 贺帅帅 XU Wanqi;WANG Luyang;BAI Yang;HE Shuaishuai(College of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Engineering Construction Consulting Company,State Grid Shanghai Municipal Electric Power Company,Shanghai 200120,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]国网上海市电力公司工程建设咨询分公司,上海200120

出　　处：《电源学报》2024年第6期91-99,共9页Journal of Power Supply

基　　金：上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)。

摘　　要：微电网并网和孤岛2种运行模式之间的平滑切换及系统频率的稳定是主从结构微电网系统安全稳定运行的重要保障。结合微电网系统的运行特征,提出基于相位角切换的并离网切换方式,增加预同步控制模块使得在孤岛转并网时更快跟踪电网相位并加以补偿,解决切换中主从逆变器输出电压和电流的冲击问题;为保证微电网系统频率的稳定,提出基于模糊下垂控制的V-F控制策略并将其应用于基于相位角切换方式的平滑切换中,使得系统频率基本保持在50Hz,避免电压电流在切换中有过大的振荡及频率出现冲击等问题;最后搭建实验平台验证所提方法的有效性和稳定性。The smooth switching between grid-connected and islanded microgrid operation modes and the stability of system frequency are important guarantees for the safe and stable operation of a master-slave microgrid system.Combined with the operating characteristics of the microgrid system,an off-grid switching method based on phase angle switching is proposed,and a pre-synchronization control module is added to make sure that the grid phase is quickly tracked and compensated when the islanded mode is switched to the grid-connected mode,thereby solving the problem of shocks in the output voltage and current from master and slave inverters in switching.To ensure the frequency stability of the microgrid system,a V-F frequency control strategy based on fuzzy droop control is proposed and further applied to the smooth switching based on phase angle switching,so that the system frequency is basically maintained at 50 Hz and the problems of large oscillations in voltage and current and frequency shocks in switching are avoided.Finally,an experimental platform was built to verify the effectiveness and stability of the proposed method.

关 键 词：微电网主从结构 相位角平滑切换 预同步控制 模糊下垂的V-F控制 

分 类 号：TM470[电气工程—电器]