摘要
微电网促进分布式能源的高比例接入与安全经济运行。下垂控制能实现微电网(microgrid,MG)内不同分布式电源根据容量比自动调节其功率输出。然而,不准确的下垂系数会造成分布式电源变流器的过应力。基于此,提出一种适用于含高比例PV微电网的分散功率分配方法,以改善微电网内分布式电源变流器内部器件的热损伤。所提方法的控制目标是在不使用通信系统的情况下,通过适当分配不同电源之间有功和无功功率,以提高系统的整体性能和可靠性。最后,通过仿真和实验验证所提方法的有效性,结果表明,所提方法能够较好地控制不同电源之间的能量流动,防止变流器的热损伤,从而提高MG的整体可靠性。
The microgrid helps to improve the highproportion distributed energy access and the safe and economical operation of the power system. Droop control can automatically adjust the power output of different distributed power sources in the MG(microgrid)according to the capacity ratio. However,an inaccurate sagging coefficient can cause overstress in the distributed power converter. To this end,this paper puts forward a decentralized power allocation method suitable for the microgrid containing high-proportion PV to improve the internal thermal damages to the converter of the microgrid. The control objective of the proposed method is to improve the overall performance and reliability of the system by appropriately distributing the active and reactive power between different power sources without using the communication system.Finally,the effectiveness of the proposed method is verified by simulation and experiment. The results show that the proposed method can better control the energy flow between different power sources and prevent thermal damage of the converter,so as to improve the overall reliability of the MG.
作者
刘昊
贺翔
赵健
马斌
LIU Hao;HE Xiang;ZHAO Jian;MA Bin(Electric Power Research Institute,State Grid Henan Electric Power Company,Zhengzhou 450052,Henan,China)
出处
《电网与清洁能源》
北大核心
2022年第10期69-78,共10页
Power System and Clean Energy
基金
国家自然科学基金资助项目(5177070051)。
关键词
分散控制
功率分配
热应力
下垂控制
decentralized control
power sharing
thermal stress
droop control
