负荷低压释放对低压减载策略的影响  

The Influence of Load Low-voltage Releasing on Under-voltage Load Shedding Strategy

作　　者：刘茂集 顾丹珍[1] 郭强[2] 童涛[1] 

机构地区：[1]上海电力学院电气工程学院,上海200090 [2]国网上海市电力公司电力科学研究院,上海200437

出　　处：《现代电力》2016年第5期74-79,共6页Modern Electric Power

基　　金：国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001(001-031)-2012)

摘　　要：随着系统中对电压敏感的负荷不断增多,用户侧的负荷低压释放问题越来越突出。系统在发生故障而采取低压减载措施的同时,用户侧负荷出现的负荷低压释放将增大系统中的负荷切除总量,导致负荷切除过多,故障后恢复电压过高的不利结果。本文通过对电网用户侧各负荷的低压释放特性的研究,建立了考虑负荷低压释放特性的综合负荷模型,分析负荷低压释放对低压减载影响的机理,通过对10机39节点系统仿真,分析低压释放对低压减载策略的影响。研究表明,用户侧负荷低压释放量、负荷低压是否延时释放以及延时释放时间将对低压减载策略产生影响。With the increasing application of voltage-sensitive load,the problem of load low-voltage releasing in user side is becoming more and more obvious.When faults occur in the system,the relative measures of under-voltage load shedding（UVLS）strategy are used.Meanwhile the phenomenon of load low-voltage releasing in user side will enlarge the total removable load,which leads to such disadvantages as the removal of the excessive amounts of loads and the very high recovery voltages.In this paper,through the study of the low-voltage releasing characteristics of some typical loads in grid side,the composite load model is built by considering the characteristics of load low-voltage releasing firstly.Then the mechanism of the influence of lowvoltage releasing on the load under-voltage shedding measures by the load low-voltage release is analyzed.A simulation of 10-machine39-bus system is used to verify them.The study is analyzed.Through the simulation on a 10-machine39-bus system,the impact of low-voltage releasing on undervoltage load shedding is analyzed.Results show that such three factors as the amount of load low-voltage releasing in user side,whether happening or not of the low-voltage release and relative delay release time,will influence the under-voltage load shedding strategy.

关 键 词：低压减载策略 负荷低压释放 负荷低压释放特性 负荷模型 

分 类 号：TM762[电气工程—电力系统及自动化]