摘要
超、特高压输电线路因故障切除后容易引发受端电网出现大规模潮流转移过负荷,严重时会导致连锁跳闸甚至大面积停电。针对此现象,提出一种受端电网分层优化切负荷策略。首先计及不同电压等级特点,建立受端电网的跨电压等级分层模型。一方面针对500kV及以上电压等级系统,实时监测线路过负荷情况并划分过负荷区域,以切负荷总量最小为目标函数,考虑电压和频率稳定约束,利用改进粒子群算法建立优化切负荷方案。另一方面,针对500kV以下电压等级系统,基于变电站之间传递的线路负荷信息,采用AHP-模糊综合评价法构建综合代价最低的切负荷预案,一旦接收到控制任务即按预案由500kV变电站逐级向下快速进行切负荷任务分配,最终实现分层优化切负荷。新英格兰10机39节点算例表明相较于其他策略,该策略在有效消除线路过负荷的同时使计算时间大幅减少,有利于实现工程在线应用。
Large-scale power flow transferring overload occurs in the receiving end power grid after the fault removal of EHV and UHV transmission lines,which may lead to cascading trips or even large-scale blackouts.In view of this phenomenon,a hierarchical optimized load shedding strategy for receiving end power grid is proposed.Firstly,considering the characteristics of different voltage levels,a hierarchical model of cross-voltage levels for receiving-end power grids is established.On the one hand,for 500 kV and above voltage level system,taking the minimum total load shedding as the objective function,using improved particle swarm optimization algorithm to establish an optimal load shedding scheme.On the other hand,for the voltage level system below 500 kV,the AHP-fuzzy comprehensive evaluation method is used to construct the lowest comprehensive cost load-shedding plan.Once the control task is received,the load-shedding task is quickly distributed step by step from 500 kV substation to downward according to the plan,and finally the hierarchical optimized load-shedding is realized.New England 10-machine 39-bus example shows that compared with other strategies,this strategy can effectively eliminate line overload and reduce computing time significantly,which is conducive to the realization of on-line engineering applications.
作者
王增平
朱劭璇
王彤
秦红霞
Wang Zengping;Zhu Shaoxuan;Wang Tong;Qin Hongxia(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;Beijing Sifang Automation Company Limited by Shares,Beijing 100085,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第5期1128-1139,共12页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点项目(51637005)
国家重点研发计划智能电网技术与装备重点专项(2016YFB0900604)
国家电网有限公司科技项目(SGBJDK00KJJS1900088特大型电网系统级控制保护技术框架研究与设计)资助
关键词
潮流转移
过负荷区域
优化切负荷
改进粒子群
模糊综合评价
Power flow transferring
overload area
optimizing load shedding
improved particle swarm optimization
fuzzy comprehensive evaluation method
作者简介
王增平,男,1964年生,教授,博士生导师,研究方向为继电保护、变电站综合自动化和广域保护等。E-mail:wangzp1103@sina.com;通信作者:王彤,女,1985年生,博士,研究方向为新能源电力系统稳定分析与控制,暂态稳定分析。E-mail:hdwangtong@126.com。
