文章摘要
曹永吉,张恒旭,谢宇峥.暂态低频高压驱动的直流馈入电网减负荷紧急轮配置方案[J].电力系统自动化. DOI: 10.7500/AEPS20180404006.
CAO Yongji,ZHANG Hengxu,XIE Yuzheng.Emergency Load Shedding Stage of HVDC Receiving-end Power Grid Based on Low-frequency and High-voltage Feature[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180404006.
暂态低频高压驱动的直流馈入电网减负荷紧急轮配置方案
Emergency Load Shedding Stage of HVDC Receiving-end Power Grid Based on Low-frequency and High-voltage Feature
DOI:10.7500/AEPS20180404006
关键词: 低频减载  低频高压  特征驱动  灰色关联分析  k-近邻
KeyWords: under-frequency load shedding  low-frequency and high-voltage  feature-driven  grey correlation analysis  k-nearest neighbor
上网日期:2018-09-30
基金项目:国家重点研发计划
作者单位E-mail
曹永吉 电网智能化调度与控制教育部重点实验室(山东大学) caoyongji1991@163.com 
张恒旭 电网智能化调度与控制教育部重点实验室(山东大学) zhanghx@sdu.edu.cn 
谢宇峥 电网智能化调度与控制教育部重点实验室(山东大学) garfiona@163.com 
摘要:
      针对相控换流式直流(line-commutated converter-based high voltage direct current,LCC-HVDC)闭锁扰动下受端电网的低频控制问题,考虑事件发生后固定的暂态响应模式,提出一种基于事件特征驱动的减负荷紧急轮配置方案。推导LCC-HVDC闭锁故障时刻受端电网频率和电压的变化规律,分析延时联切换流站功补偿装置造成的低频高压现象。采用灰色关联分析方法提取电压信息,结合初始频率变化率,利用k-近邻算法匹配动作方案。在传统低频减载的基础上,附加紧急轮以应对LCC-HVDC闭锁故障,由就地监测的低频高压特征驱动,实时匹配决策表以切除故障区域负荷。以某省级电网为例,对提出方法的有效性进行了验证。
Abstract:
      Taking into account the regular response pattern of receiving-end system subjected to LCC-HVDC blocking, a fea-ture-driven load shedding scheme of emergency stage is proposed to enhance the under-frequency control ability. The evolution of frequency and voltage at the instant of LCC-HVDC blocking is derived, and the low-frequency and high-voltage feature stemming from the time-delay inter-tripping of reactive power compensation devices is analyzed. Moreover, the partial voltage characteristic is extracted by grey correlation analysis and the initial rate of change of frequency is estimated from local measurement, on which the k-nearest neighbor algorithm is performed to match the decision table. An additional emergency stage is added into the conventional under-frequency load shedding scheme in response to LCC-HVDC blocking, where the low-frequency and high-voltage feature is taken as operation criterion and the real-time local matching of decision table is adopted. A provincial power grid is taken as a case study to validate the effectiveness of the proposed approach.
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