摘要
近年来,微电网中的新能源渗透率逐渐增高,但部分系统仍保留了柴油发电机来保障供电。在同时含有储能逆变器和柴油发电机的孤岛交流微电网中,两者在控制策略和响应特性上的不同使系统的频率、功率在负荷波动和电源投切后易出现过大振荡乃至越限的现象。本文以地下防护工程为应用场景,针对应急供电工况下的柴储孤岛微电网进行研究,设计储能逆变器的外环控制策略,并用PSCAD软件进行仿真,实现在多种供电模式下系统的无差调频及功率稳定,并使柴储联合供电时两者的有功功率按目标比例分配。
In recent years,the penetration rate of new energy sources in microgrids has gradually increased,while some systems still retain diesel generators to guarantee power supply.In an isolated AC microgrid containing both energy storage inverters and diesel generators,the differences in control strategies and response characteristics of the two make the system frequency and power prone to excessive oscillations and even overruns after load fluctuations and power throwing.Taking the underground protection project as the application scenario,this paper studies the diesel storage isolated microgrid under the condition of emergency power supply.An outer-loop control strategy for the energy storage inverter is designed and simulated on the PSCAD software to realize the zero-error frequency regulation and power stabilization of the system under various power supply modes and to distribute the active power between the two in a target proportion when the diesel storage is jointly supplied.
作者
魏译帆
邢建春
WEI Yifan;XING Jianchun(College of Defense Engineering,Army Engineering University of PLA,Nanjing 210007)
出处
《电气技术》
2022年第11期13-20,共8页
Electrical Engineering
关键词
孤岛微电网
储能
柴油发电机
无差调频
isolated microgrid
energy storage
diesel generators
zero-error frequency modulation
