摘要
为解决枯水期低负荷运行期间水电机组安全问题,基于对短路电流及有效短路比、跳入孤岛稳定性、低次谐波振荡分析,提出最少开机优化策略。为消除直流被动跳入孤岛后短路电流不足、存在功率振荡和低次谐振等风险,提出增加跳入孤岛主动闭锁直流功能,以确保小开机方式下跳入孤岛后设备安全。运行实践表明,采用所提枯水期送端电厂开机优化策略及实施跳入孤岛主动双极闭锁功能后,梨园和阿海电厂最少开机可优化至2台,从根本上解决枯水期部分机组长期空载运行导致的设备和厂房安全风险,且有效保证了跳入孤岛后直流和电厂相关设备安全。
The paper proposes an optimization method which gives the minimum on-service generator number during the low-water and low-load period on the basis that the power system is safe and stable. The optimization considers three aspects, effective short circuit ratio, stability under island mode and low-order resonance. It is found that the introduction of active DC blocking during isolated operation mode can help effectively eliminate the risk of shortage of short-circuit current, power oscillations and low-order resonance. Operational practice suggests that the minimum on-service generator number of Liyuan and Ahai power plants can be reduced to two respectively when the proposed approach is applied. By reducing the on-service generator number, the risk of having generators operate without load during the low-water and low-load period is alleviated substantially, thus ensuring the safety of equipment of power plants during island mode.
作者
谢惠藩
梅勇
周剑
徐光虎
黄磊
李明
赵晓斌
杨健
XIE Huifan;MEI Yong;ZHOU Jian;XU Guanghu;HUANG Lei;LI Ming;ZHAO Xiaobin;YANG Jian(Power Dispatch and Control Center of China Southern Power Grid,Guangzhou 510623,China;Southern Power Grid Science Research Institute,Guangzhou 510623,China)
出处
《中国电力》
CSCD
北大核心
2020年第10期180-186,共7页
Electric Power
基金
国家自然科学基金资助项目(51777079)。
关键词
短路电流
开机优化
孤岛运行
二次谐振
主动闭锁策略
short-circuit current
generator arrangement optimization
island operation
second-order resonance
active blocking strategy
