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计及动态修正的自适应广域低频减载

ISSN号：1006-6047
期刊名称：电力自动化设备
时间：2014.4.10
页码：95-100+119
分类：TM76[电气工程—电力系统及自动化]
作者机构：[1]四川大学电气信息学院,四川成都610065, 四川大学智能电网四川省重点实验室四川成都610065, [2]ALSTOM电网研究技术中心,斯塔福德郡ST174LX
相关基金：国家自然科学基金资助项目（50977059,51207098）;中央高校基本科研业务费专项资金资助项目（2011SCU11-063）;四川省科技厅产业发展重大关键技术项目（2011GZ-0225）;科技部中欧中小企业节能减排科研合作资金资助项目（SQ2011ZOF000004）;Project supported by the National Natural Science Foundation of China （50977059,51207098）,the Fundamental Research Funds for the Central Universities（2011SCU11063）,the Key Program of Sichuan Science ＆ Technology Department（2011GZ-0225） and the Science Collaboration Foundation of Energysaving Emission-reducing of Small Medium-sized Enterprises in Sino-European （SQ2011ZOF000004）
相关项目：电力系统连锁故障的能量演变特征及其防御策略研究

作者：刘俊勇|刘友波|MASOUD Bazargan|LIANG Wuxing|

关键词：广域测量系统, 低频减载, 不平衡功率, 负荷静特性, 发电机惯性, WAMS, UFLS, active-power deficit, static load characteristics, generator inertia

中文摘要：

传统分轮逐次逼近的低频减载方法,对系统运行变化缺乏足够的适应性,会造成过切、欠切等问题,所以提出一种基于广域测量系统计及动态修正的自适应低频减载策略.在低阶频率响应模型的基础上,考虑电压对不平衡功率的影响,利用较短周期内的系统响应轨迹估计系统不平衡功率;考虑系统频率自恢复调节能力,采用频率变化率变化梯度逐轮对减载量进行动态修正;各负荷节点减载量由计及负荷特性、发电机受扰程度的多因素综合指标确定.IEEE 68节点系统仿真结果表明,所提方法可有效减少负荷切除量,同时能明显缩短频率恢复时间,保证了系统的稳定运行.

英文摘要：

Traditional UFLS（Under-Frequency Load Shedding） applies the method of successive approximation,which may cause over or under shedding due to its lack of adaptability to operational conditions of system.An adaptive UFLS based on WAMS （Wide Area Measurement System） is proposed with the consideration of dynamic correction.Based on low-order frequency response model,the effect of voltage on the imbalanced active-power is considered and the active-power deficit is estimated with the system response trajectory of short cycle.The self-recovery ability of system frequency is considered and the frequency variation rate is used to dynamically correct the load shedding amount.The load shedding amount of each load node is comprehensively determined by multiple indexes,including load characteristics and generator inertia.Simulative results of IEEE 68-bus system indicate that,the proposed method effectively reduces the load shedding amount and the frequency recovery time,guaranteeing the stable system operation.

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