综合电压频率动态交互影响的自动减负荷控制新方法  

A New Method of Automatic Load Shedding Control Based on the Voltage and Frequency Dynamics Interaction

作　　者：侯玉强[1] 方勇杰[1] 杨卫东[1] 鲍颜红[1] 徐泰山[1] 刘福锁[1] 李碧君[1] 

机构地区：[1]国网电力科学研究院/南京南瑞集团公司,江苏省南京市210003

出　　处：《电力系统自动化》2010年第5期24-28,共5页Automation of Electric Power Systems

基　　金：国家发改办高技([2008]2012);国家电网科([2008]1360)"电力系统安全稳定分析与控制"重点实验室完善建设和国家电网公司"基于多代理技术的低频低压减负荷技术研究"资助项目~~

摘　　要：基于单一的频率量测或单一的电压量测而独立动作的传统低频低压减负荷控制装置,未计及受扰系统电压与频率之间的实时动态交互,难以完全适应系统初始工况、负荷特性或扰动形式的变化,某些情况下可能出现严重的欠控制或过控制。文中提出一种在装置的实时控制算法中计及电压与频率动态交互影响的自动减负荷控制方法,其核心是测量装置安装节点的电压、频率以及负荷有功功率,并计及与当前系统初始工况、负荷特性或所发生扰动形式相对应的频率电压相关系数,实时计算综合状态量以触发自动减负荷控制装置的分轮次动作。对实际电网的时域仿真结果表明,该方法可较好地适应系统初始工况、负荷特性或扰动形式的变化。Traditional under frequency load shedding（UFLS）and under voltage load shedding（UVLS）operate independently using either frequency or voltage measurements without considering the actual voltage and frequency dynamics interaction under various system conditions,load characteristics or contingency scenarios.In some cases,it may cause severe under-control or over-control.This paper presents a new method of automatic load shedding control integrating voltage and frequency dynamics interaction in the device＇s real-time control algorithm.The key techniques are to measure the voltage,frequency and active load demand at the device installation bus,and to calculate a synthesized state variable for triggering stepwise load shedding operation by taking into account a voltage-frequency interaction under the concerned system operating condition,load characteristics or contingency scenarios.Time domain simulation results of a real power system show that the new method has better adaptability to system operating conditions,load characteristics and contingency scenarios.

关 键 词：低频减负荷 低压减负荷 动态交互 频率电压相关系数 综合状态量 

分 类 号：TM714[电气工程—电力系统及自动化]