功率因角预测下特高压接入后电网可靠性提升方法设计  

Design of Reliability Improvement Method for Power Grid after UHV Connection under Power Factor Angle Prediction

作　　者：马海忠 MA Hai-zhong(State Grid Ningxia Electric Power Co.,Ltd.,YinChuan 750001)

机构地区：[1]国网宁夏电力有限公司,银川750001

出　　处：《环境技术》2024年第3期76-81,100,共7页Environmental Technology

摘　　要：特高压接入电网后,受到线路可靠性波动影响,会出现潮流过载导致电压波动越限问题。电网系统容易出现故障或导致供电中断,严重影响电网可靠性。提出功率因角预测下特高压接入后电网过载电压波动控制方法,进而提高电网可靠性。对电网功率因角特性展开分析,根据功率因角特性分析结果,预测特高压接入后电网电压轨迹的变化;结合轨迹变化约束,设计有功潮流控制器来处理线路过载问题;根据线路过载情况的不同,设计串、并联换流器完成电压协调控制,补充潮流控制器的不足,提高电网可靠性。实验结果表明:所提方法下电网的失负荷概率在0.5以下,可靠性优化控制时间在(28.6~40.4)s。表明所提方法的特高压接入下的电网网架结构可靠性较高、实际应用效果较佳。After the ultra-high voltage is connected to the power grid,it is affected by fluctuations in the reliability of the transmission line,which can lead to problems of power flow overload and voltage exceeding limits.The power grid system is prone to malfunctions or power supply interruptions,seriously affecting the reliability of the power grid.Propose a method for controlling the overload voltage of the power grid after ultra-high voltage connection under power angle prediction to improve the reliability of the power grid.Analyze the power angle dependent characteristics of the power grid,and predict the changes in the voltage trajectory of the power grid after the ultra-high voltage is connected based on the analysis results of the power angle dependent characteristics;Design an active power flow controller to handle the problem of line overload based on trajectory change constraints;Design series and parallel inverters to achieve voltage coordination control based on different overload conditions of the line,supplement the shortcomings of the power flow controller,and improve the reliability of the power grid.The experimental results show that the probability of power grid loss under the proposed method is below o.5,and the reliability optimization control time is between 28.6-40.4 seconds.This indicates that the proposed method has high reliability and practical application results in the grid structure under ultra-high voltage connection.

关 键 词：特高压接入电网 电网可靠性 轨迹灵敏度 有功潮流控制器 直流分层接入技术 

分 类 号：TM715[电气工程—电力系统及自动化]