摘要
孤岛微电网高比例新能源强不确定性导致系统频率波动大,极端情况下超出边界阈值,触发电网保护装置动作,危及电网安全稳定的挑战,针对此情况,提出一种计及变流器频率支撑与容量约束的孤岛微电网多源协同调度方法。首先,构建风光水储多源参与动态频率支撑的孤岛微电网动态频率响应模型,建立系统多源功率-频率的时域表达式和动态频率安全约束。其次,探讨变流器容量限制与有功调频和无功调压的需求关系,提出一种基于变流器剩余空闲容量约束的动态频率支撑策略,以系统运行经济性和频率电压安全性为优化目标,考虑动态频率和电压安全等约束,提出一种风光水储多源协同调频调压的孤岛微电网优化调度方法。最后,以改进IEEE 33节点系统为例对所提优化调度方法进行仿真,结果表明,所提方法提升了孤岛微电网在强不确定性下的频率和电压安全水平。
In response to the challenge posed by the high proportion of new energy intensity uncertainty within island microgrids,which can lead to significant frequency fluctuations and exceed the boundary threshold in extreme cases,thereby triggering the protective action of power grid devices and endangering the security and stability of the power grid,we propose a multi-source collaborative scheduling method for islanded microgrids.This method considers converter frequency support and capacity constraints.Firstly,a dynamic frequency response model for the islanded microgrid with multi-source participation(wind,photovoltaic,hydro,and storage)in dynamic frequency support is established.This model includes the system's multi-source power-frequency time-domain expression and dynamic frequency safety constraints.Secondly,the relationship between the capacity limitations of converter and the demands for active frequency modulation and reactive voltage regulation is discussed.A dynamic frequency support strategy based on the remaining available capacity of inverters is proposed.With dual optimization objectives of system operational economy and frequency-voltage security,and considering constraints such as dynamic frequency and voltage safety,an optimal dispatch method for islanded microgrids is proposed,incorporating coordinated frequency and voltage regulation by wind,photovoltaic,hydro,and storage.Finally,simulation results based on an improved IEEE 33-node system validate the effectiveness of the proposed method in enhancing the frequency and voltage stability of islanded microgrids under large disturbances and uncertainties.
作者
邓美玲
江通财
白振毅
林健
陈永进
吴子龙
DENG Meiling;JIANG Tongcai;BAI Zhenyi;LIN Jian;CHEN Yongjin;WU Zilong(Guangdong Power Grid Co.,Ltd.Shaoguan Renhua Power Supply Bureau,Shaoguan 512300,China)
出处
《山东电力技术》
2025年第6期10-21,51,共13页
Shandong Electric Power
基金
中国南方电网有限责任公司科技项目(GDKJXM20230364)。
关键词
孤岛微电网
风光水储
频率支撑
电压安全
优化调度
isolated microgrid
wind,photovoltaic,hydro and storage
frequency support
voltage safety
optimal dispatch
