中国电力 ›› 2020, Vol. 53 ›› Issue (2): 76-82.doi: 10.11930/j.issn.1004-9649.201906007

• 电网 • 上一篇    下一篇

含水电系统的低频减载关键参数优化方法

潘晓杰1, 樊茂森2, 张文朝2, 李朋旺2, 张立伟2   

  1. 1. 国家电网有限公司华中分部, 湖北 武汉 430077;
    2. 北京科东电力控制系统有限责任公司, 北京 100089
  • 收稿日期:2019-05-31 修回日期:2019-11-02 出版日期:2020-02-05 发布日期:2020-02-05
  • 作者简介:潘晓杰(1976-),男,博士,高级工程师,从事电力系统稳定分析方面的研究,E-mail:pxj76@163.com;樊茂森(1994-),男,硕士研究生,从事电力系统稳定分析方面的研究,E-mail:744757525@qq.com

Optimizing Method for Key Parameters of Under-frequency Load Shedding for Power System Penetrated with Hydropower

PAN Xiaojie1, FAN Maosen2, ZHANG Wenchao2, LI Pengwang2, ZHANG Liwei2   

  1. 1. Central China Branch of State Grid Corporation, Wuhan 430077, China;
    2. Beijing Kedong Electric Power Control System Co., Ltd., Beijing 100089, China
  • Received:2019-05-31 Revised:2019-11-02 Online:2020-02-05 Published:2020-02-05

摘要: 低频减载是电网的最后一道防线的重要组成部分,针对在水电高占比电网系统中发生大的功率缺额扰动时低频减载装置容易出现过切现象的问题,分析了含水电系统发生功率缺额故障后的频率变化特性,并从水锤效应原理出发,结合电网发生扰动后的频率特性和水锤效应的影响,提出一种适当加大级差的低频减载关键参数的优化方法,最后经过仿真实验证明该方法可以有效应用在水电高占比电网中,减少发生极端功率缺额扰动后的负荷过切现象。

关键词: 低频减载, 水锤效应, 频率稳定, 第三道防线, 功率缺额

Abstract: Under-frequency load shedding is an important part of the last defense line for power grid. However, the under-frequency load shedding device is prone to overcutting when large power shortage disturbance occurs in the grid system with high penetration of hydropower. Based on an analysis of the frequency variation characteristics following power shortage fault of power system penetrated with hydropower, an optimization method is proposed with appropriate step size for the key parameters of under-frequency load shedding, according to the water hammer effect principle and with consideration of the frequency characteristics of the power grid after disturbance and the water hammer effect. The simulation test has proved that the method can be effectively applied to the power grid with high penetration of hydropower to reduce the overcutting problem following the extreme power shortage disturbance.

Key words: under-frequency load shedding, water hammer effect, frequency stability, the third defense line, power shortage