摘要
针对孤岛不平衡负载下模块化多电平变换器(MMC)串联结构微电网系统中微源输出功率波动,引起的相间功率不平衡及运行不稳定问题,研究了一种基于有功功率修正(Active Power Correction,APC)的相间功率平衡控制策略。基于系统孤岛模式等效电路,对系统输出功率进行了数学建模,并分析了相间功率流动模式。在三相输出电压对称的前提下,根据微源功率及负载功率确定需要修正的功率,设计了环流控制器,对直流环流控制实现相间功率互济。通过仿真验证,该策略能使相间功率自适应动态调节,达到相间功率平衡的目的。
A phase to phase power balance control strategy based on APC is studied for the phase to phase power imbalance and operational instability caused by the microsource output power fluctuation in the MMC series structure microgrid system under islanded unbalanced load.Based on the system islanding mode equivalent circuit,the system output power is modeled mathematical-ly and the inter-phase power flow pattern is analyzed.On the premise of symmetrical three-phase output voltage,the power to be corrected is determined according to the micro-source power and load power,and a circulating current controller is designed to achieve inter-phase power mutualization using control of the DC circulating current.The strategy has been proven to enable adaptive dynamic adjustment of the three-phase power and eventually make the power balance between phases.
作者
宋凯平
王兴贵
薛晟
SONG Kaiping;WANG Xinggui;XUE Sheng(College of Electrical and Information Engineering,Lanzhou University of Technology,Lanzhou 730050)
出处
《计算机与数字工程》
2024年第1期283-288,共6页
Computer & Digital Engineering
基金
国家自然科学基金项目(编号:51967011)资助。
关键词
孤岛模式
功率修正
直流环流
相间功率平衡
island mode
power correction
DC circulation
power balance between phases
