适用于微网孤岛运行的低频减载方法  

An Under-Frequency Load Shedding Method Adaptive to the Islanding Operation of Micro-Grids

作　　者：林湘宁[1] 李正天[2] 薄志谦[3] Andrew Klimek 

机构地区：[1]三峡大学电气信息学院,湖北省宜昌市443002 [2]华中科技大学电气与电子工程学院,湖北省武汉市430074 [3]AREVA输配电集团

出　　处：《电网技术》2010年第3期16-20,共5页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB219701);国家863高技术基金项目(2008AA05Z214)~~

摘　　要：提出了一种微网频率控制新策略。该策略由PID控制器构成频率的闭环控制回路,根据系统的功率缺额,调整PID控制算法,并分别采用粗调轮与细调轮低频减载(under-frequency load shedding,UFLS)、紧急启动轮UFLS等策略进行频率控制。紧急启动轮UFLS控制策略可以提高微网的系统稳定性和可靠性;粗调轮与细调轮UFLS控制策略可以适应不同的功率缺额,使控制的负荷量尽可能细化。仿真结果验证了方法的有效性。A new control strategy is proposed, in which a closed-loop frequency control circuit is composed by PID controller and the PID algorithm should be adjusted according to the power shortage of power grid and the control strategies for under frequency load shedding （UFLS） such as rough-adjusting step, fine-adjusting step and emergence pick-up step are adopted respectively. The UFLS control strategy for emergence pick-up step can improve system stability and reliability of micro-grid; and the UFLS control strategies for rough-adjusting step, the fine-adjusting step can adapt to various power shortage and the load amount could be deliberately divided. Simulation results show that the proposed method is effective.

关 键 词：微网 低频减载 紧急启动轮 粗调轮 细调轮 

分 类 号：TM732[电气工程—电力系统及自动化]