摘要
文中提出了一种微电网在孤岛模式下的低频减载策略。总结了各种分布式电源的特性,建立了由双馈风电机组、光伏发电系统、燃料电池发电系统、微型燃气轮机发电系统、蓄电池及局部控制器组成的微电网的动态仿真模型。探讨了孤岛模式下微电网的频率控制架构,以及系统频率变化率、等效转动惯量与有功缺额之间的关系,并据此提出了估算微电网扰动后有功缺额的方法和相应的低频减载策略。基于所构建的微电网,论证了以试验方式获取微电网等效转动惯量的可行性。时域仿真结果表明,所提出的低频减载策略可以快速、可靠地恢复微电网的频率稳定性。
An underfrequency load shedding（UFLS） strategy is proposed for an islanded microgrid.The characteristics of different distributed energy resources are summed up and a dynamic microgrid simulation model is developed that is composed of the wind turbine-driven doubly-fed induction generator（DFIG）,photovoltaic,fuel cell,microturbine,storage battery and local controller.The frequency control scheme of an islanded microgrid is explored and the relationship between the rate of frequency change,inertia constant and the magnitude of active power deficiency is studied,by means of which the strategy by estimating the magnitude of disturbance to implement UFLS is put forward.Based on the microgrid constructed,the experimental method of obtaining microgrid equivalent inertia is demonstrated.Time domain simulation results show that the proposed UFLS strategy is capable of rapidly and reliably restoring the frequency stability of the microgrid.
出处
《电力系统自动化》
EI
CSCD
北大核心
2011年第9期47-52,共6页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50907008
60974036)~~
关键词
微电网
孤岛模式
频率控制
低频减载
等效转动惯量
microgrid
islanded mode
frequency control
underfrequency load shedding
equivalent moment of inertia
