Application Research of Zero Power Protection for Thermal Power Plants

doi:10.11930/j.issn.1004-9649.2014.9.107.4

Abstract

Abstract: At present, the logic of power load unbalance is widely used in DEH control system of large thermal power generation unit to prevent the unit from considerable oscillation and tripping when the power output channel is interrupted. However, the logic relies heavily on the active power transmitter, and its weak ability of anti-interference is easy to cause the unit’s maloperation. To solve this problem, based on the actual fault cases, the speed control mode before unit’s grid connected operation and load control mode after unit’s grid connected operation were studied, in which the advantages of zero power protection such as accurate judgment, fast operating and strong anti-interference ability when load interruption happens were analyzed and verified. Moreover, the tripping way and the necessity of zero power protection were also discussed and it was recommended to configure zero power protection in the thermal power unit.

Key words: zero power, overspeed protection, power load imbalance, load interruption, OPC

CLC Number:

TM774

WU Peng-yue, YANG Bo, WANG Hai-tao, SUN Gang-hu, PENG Jin-ning. Application Research of Zero Power Protection for Thermal Power Plants[J]. Electric Power, 2014, 47(9): 107-111.

Add to citation manager EndNote|Ris|BibTeX

URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.9.107.4

https://www.electricpower.com.cn/EN/Y2014/V47/I9/107

References

[1] 王清,黄葆华,伍小林,等. 1 000 MW典型机组甩负荷试验[J].中国电力,2011,44（5）：65-66.
WANG Qing, HUANG Bao-hua, WU Xiao-lin, et al . Steam turbine load rejection test of typical 1 000 MW unit[J]. Electric Power, 2011, 44(5): 65-66.
[2] 田丰,余天龙. 大型机组甩负荷试验若干问题探讨[J]. 中国电力,2000,33（7）：85-86.
TIAN Feng, YU Tian-long. Discussion on the problems in load-rejection test of large size generating units[J]. Electric Power, 2000, 33(7): 85-86.
[3] 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.
ZHANG Bao, GU Wei-fei, XU Xi-jin, et al . Load rejection tests for 600 MW steam turbines when LDA function fails[J]. East China Electric Power, 2006, 34(3): 42-45.
[4] 朱亚清,李锋,张曦,等. 600 MW超临界机组OPC误动原因分析及对策研究[J]. 电力技术,2010,19（13-14）：67-68.
ZHU Ya-qing, LI Feng, ZHANG Xi, et al . The solution strategy and cause analysis of OPC maloperation in 600 MW supercritical generator unit [J]. Electric Power Technology, 2010, 19(13-14): 67-68.
[5] 管春雨,沙友平,王祥. 320 MW超临界机组突然甩负荷事件分析与处理[J]. 江苏电机工程,2005,24（6）：77-79.
GUAN Chun-yu, SHA You-ping, WANG Xiang. Analysis and treatment of sudden load drop of 320 MW supercritical unit [J]. Jiangsu Electrical Engineering, 2005, 24(6): 77-79.
[6] 南京南瑞继保电气有限公司. RCS-985UP型发电机零功率切机装置技术和使用说明书（ZL_YJBH2010.0907）[R].
[7] 管新娟,朱忠亭,李东岭. 发电机正向低功率及逆功率保护配置及整定[J]. 电力系统保护与控制,2011,39（4）：111-113.
GUAN Xin-juan, ZHU Zhong-ting, LI Dong-ling. The configuration and value calculation for the generator’s positive low power protections and adverse power protections[J]. Power System Protection and Control, 2011, 39(4): 111-113.
[8] 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）：148-150.
QIAO Yong-cheng, KOU Hai-rong, WANG Yun-hui, et al . Zero power protection of generator[J]. Electric Power Automation Equipment, 2011, 31(5): 148-150.
[9] 李福安,唐治平. 汽轮机DEH系统OPC超速保护功能存在的问题和改进[J]. 新疆电力技术,2009（3）：28-29.
[10] 田丰. 我国600 MW等级汽轮机甩负荷试验现状分析[J]. 汽轮机技术,2010,52（3）：221-224.
TIAN Feng. Load-rejection test of 600 MW capacity class turb ine-generator in China[J]. Turbine Technology, 2010, 52(3): 221-224.
[11] 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.
WANG Ke-shan. Application of zero-power tripping protection for large thermal power plant[J]. Energy and Energy Conservation,2011(4): 79-81.