杨涛
YANG Tao

• 1:国网浙江省电力有限公司电力科学研究院

摘要(Abstract)：

发电机零功率保护在大型火力发电厂中的应用越来越广泛,但实际运行中仍存在判据不够完善、与汽轮机超速保护的关系存在争议、出口方式及配置原则缺乏统一规范等技术问题。通过对目前常用的零功率保护逻辑进行分析,指出零功率保护判据普遍存在的问题;基于零功率时机端电压突增、电流突降后电气功率在短时内降为零这一电气特征,提出了一种优化的零功率保护判据;分析了103%超速保护、负荷中断预测、调门快关等汽轮机超速保护的作用及其与发电机零功率保护的关系,得出了超速保护无法替代零功率保护的结论。另外,对零功率保护的出口方式及配置原则等问题进行分析并提出了相关建议。
Zero power protection is widely used in large thermal power plants. However, there are some technical problems such as imperfect criterion, the dispute over the turbine over-speed protection, lack of uniform norms of the export mode and configuration principle. Based on the analysis of the current zero power protection logic, the common problems of zero power protection criterion are pointed out. Based on the electrical characteristics that the voltage of the generator suddenly increases, the current suddenly decreases and then the electric power is reduced to zero in a short time when zero power happens, an optimized zero power protection criterion is proposed. The function of turbine over-speed protection such as 103% over speed control,load drop forecasting and fast valving, and its relationship with generator zero power protection are analyzed.It is concluded that overspeed protection cannot replace zero power protection. In addition, export mode and configuration principle of zero power protection are analyzed and some suggestions are proposed.

关键词(KeyWords)： 火电机组;零功率保护;保护判据优化;超速保护;出口方式;配置原则
thermal power generating units;zero power protection;protection criterion optimization;overspeed protection;export mode;configuration principle

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 杨涛
YANG Tao

DOI: 10.19585/j.zjdl.201811010

参考文献(References)：

• [1]严伟,方运昇,陈俊,等.特大型机组保护若干问题探讨[J].江苏电机工程,2011,30(2):16-19.
• [2]王可山.零功率切机保护在大型火电厂的应用[J].能源与节能,2011(4):79-81.
• [3]周傅峻,林彤.500 kV系统单相瞬时故障引起2台机组跳闸的原因分析[J].浙江电力,2014,33(10):28-31.
• [4]邵梦桥,张建侠.发电机零功率保护切机逻辑研究[J].贵州电力技术,2015,18(1):62-64.
• [5]朱青国,孙淑莲.功率负荷平衡保护和零功率切机保护优化的探讨[J].浙江电力,2016,35(8):56-59.
• [6]杨涛,王悦,童凯.零功率保护误动分析及对策[J].浙江电力,2014,33(8):22-24.
• [7]田丰,张俊杰.大型机组电超速保护装置综述[J].国际电力,2001,5(4):13-18.
• [8]张宝,徐熙瑾,沈全义.甩负荷预测功能失效时的甩负荷试验[J].汽轮机技术,2006,48(2):124-126.
• [9]张宝,顾伟飞,徐熙瑾,等.600 MW汽轮机LDA功能失效时的甩负荷试验分析[J].华东电力,2006,34(3):42-45.
• [10]乔永成,寇海荣,王云辉,等.发电机零功率保护[J].电力自动化设备,2011,31(5):148-151.
• [11]兀鹏越,杨博,王海涛,等.火电机组零功率保护的应用研究[J].中国电力,2014,47(9):107-111.
• [12]朱松强.功率负荷不平衡模块PLU误动原因分析[J].浙江电力,2005,24(4):43-44.
• [13]张宝,杨涛,项瑾,等.电网瞬时故障时汽轮机汽门快控误动作原因分析[J].中国电力,2014,47(5):25-28.
• [14]过小玲,郑渭建.取消东汽机组PLU保护的可行性探讨[J].浙江电力,2012,31(1):52-54.
• [15]大型发电机变压器继电保护整定计算导则:DL/T 684-2012[S]北京:中国电力出版社,2012.