基于复合信息的一种适应多运行方式下振荡中心迁移的失步解列策略  

An Out-of-step Splitting Strategy Based on Complex Information Suiting Oscillating Center Migration under Multi-Operation Mode

作　　者：倪航鹏 林涛[1] 毕如玉[1] 徐遐龄 刘林 NI Hang-peng;LIN Tao;BI Ru-yu;XU Xia-ling;LIU Lin(School of Electrical Engineering,Wuhan University,Wuhan 430072,China;State Grid Central China Branch, Wuhan 430074,China;State Grid Jiangsu Electric Power Co.,LTD.,Nanjing 210024,China)

机构地区：[1]武汉大学电气工程学院,湖北武汉430072 [2]国家电网公司华中分部,湖北武汉430077 [3]国网江苏省电力有限公司,江苏南京210024

出　　处：《水电能源科学》2019年第1期160-163,167,共5页Water Resources and Power

基　　金：国家重点研发计划(2017YFB0902600;2017YFB0902604);国家电网公司总部科技项目

摘　　要：针对失步振荡中心迁移影响失步解列装置配置和参数整定的问题,基于送端电网等值三机系统模型,推导了振荡中心位置关于电源电势幅值比、线路阻抗、电源频率和电源初相角的函数表达式,分析了系统参数变化特别是不同系统运行方式下电源初相角对振荡中心迁移规律的影响,研究表明电源初相角对于振荡中心迁移方向和范围的作用最为突出,多频失步场景下失步中心定位和失步解列装置参数整定必须考虑不同系统运行方式下电源初相角因素的影响。在此基础上提出了一种适应多运行方式下振荡中心迁移的基于复合信息的失步解列策略,即通过广域测量系统(WAMS)提供线路两端母线电压幅值与相位信息和线路就地失步解列装置的Ucosφ判据来确定失步振荡中心位置和失步振荡周期,检测到整定的失步周期后实施解列,极大简化了失步解列装置参数配置和整定过程。仿真分析验证了多频失步场景下不同系统运行方式对应电源初相角对振荡中心迁移规律影响分析的正确性及该失步解列策略在多运行方式下的适应性。研究成果可用于指导工程实践。Aiming at the impacts of oscillating center migration on configuration of out-of-step splitting device and its parameters setting,based on the equivalent three machine system model,this paper deduced three machine multi-frequency oscillation center voltage amplitude and position function expression for power potential amplitude ratio,line impedance,power frequency and initial phase of power potential.And the influence of system parameters especially the initial phase of power under different system operation modes on the oscillation center migration was analyzed.It finds out that the initial phase of power has an obvious impact on the migration direction and range of oscillation center,and multi-frequency out-of step oscillation center positioning and splitting devices tuning must consider the initial phase of power potential under different system operation modes.On this basis,this paper proposes an out-of-step splitting strategy suiting for oscillation center migration under multi-operation mode based on complex information,whose bus voltage amplitude/phase information provided by WAMS and local Ucosφcriterion were used to determine the position of out-of-step oscillation center and out-of-step period.The simulation results show that the influence of different power system operation modes on the migration characteristics of oscillation center is correct in multi-frequency out-of-step oscillation scenario,and analysis of the out-of-step strategy based complex information has a good adaptability under different operation modes.The research results can guide engineering practice.

关 键 词：多频失步振荡 基于Ucosφ判据 WAMS 复合信息 失步解列策略 

分 类 号：TM7[电气工程—电力系统及自动化]