基于改进REI等值法的网架调整限流策略

惠宇翔; 黄景光; 李正天; 林湘宁

引用本文:	惠宇翔,黄景光,李正天,等.基于改进REI等值法的网架调整限流策略[J].电力系统保护与控制,2018,46(8):17-23.
	HUI Yuxiang,HUANG Jingguang,LI Zhengtian,et al.Current limiting strategy by adjusting power grid configuration based on improved REI equivalent method[J].Power System Protection and Control,2018,46(8):17-23

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基于改进REI等值法的网架调整限流策略
惠宇翔¹,黄景光¹,李正天²,林湘宁^1,2
(1.电气与新能源学院(三峡大学)，湖北宜昌 443002; 2.强电磁工程与新技术国家重点实验室(华中科技大学)，湖北武汉 430074)

摘要:

为了提高传统全网遍历限流方案的求解效率，面对大规模电力系统，给出一种基于改进REI等值法的网架调整限流策略。将网络等值技术与500 kV网架调整限流机理相结合，根据支路限流灵敏度指标对原系统进行一次预处理，将其划分为研究系统和若干外部子系统。再利用改进的动态REI等值法对各子系统进行化简，以等值过程中各发电机在虚拟支路上的功率传输因子来确定等值发电机的参数。通过在两个算例上的仿真验证，结果表明改进后的REI等值法能够较好地保留原系统的动态特性，同时迅速筛选出最优限流开断线路方案。

关键词: 短路电流超标限流灵敏度 REI等值法功率传输因子动态特性

DOI：10.7667/PSPC170466

分类号:

基金项目:国家自然科学基金项目资助(51577077;51477090)

Current limiting strategy by adjusting power grid configuration based on improved REI equivalent method

HUI Yuxiang¹,HUANG Jingguang¹,LI Zhengtian²,LIN Xiangning^1,2

(1. College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China;2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract:

For increasing the efficiency of previous whole network traversal current limiting project, a current limiting strategy by adjusting power grid configuration based on improved REI equivalence is proposed for large-scale power system. It combines the network equivalence technology with current limiting mechanism by adjusting 500 kV power system configuration and carries out a pretreatment to primary system according to the branch current limiting sensitivity index. Original system is divided into research system and several external subsystems. The subsystems are simplified using improved dynamic REI equivalence method, and the parameters of the equivalent generator are calculated according to power transfer distribution factors of each generator on virtual branch during equivalence. The simulation results of two cases show that the improved REI equivalence method can better preserve the dynamic characteristics of the original system and quickly select the optimal breaking lines. This work is supported by National Natural Science Foundation of China (No. 51577077 and No. 51477090).

Key words: short-circuit current over-limited current limiting sensitivity index REI reduction technique power transfer distribution factors dynamic characteristics

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