山区电网线路过载保护协调优化控制策略研究  

Research on coordination and optimization control strategy of line overload protection in mountainous power grid

作　　者：黄莹凤 卢杰 HUANG Yingfeng;LU Jie(Baise New Aluminum Power Co.,Ltd.,Baise Guangxi 533000,China;Guangxi Dahua Smart City Joint Stock Co.,Ltd.,Baise Guangxi 533000,China)

机构地区：[1]百色新铝电力有限公司,广西百色533000 [2]广西大华智城股份有限公司,广西百色533000

出　　处：《宁夏电力》2024年第2期19-26,共8页Ningxia Electric Power

摘　　要：山区电网小水电众多但负荷轻,若叠加新能源大量接入,将造成夏季丰水期输电断面过载,限制清洁能源外送和威胁电网设备安全。为此,提出将断面过载保护与可调节电源进行协调配合以获得最优控制效果的保护动作策略。首先,基于潮流追踪法确定电源至断面的功率传输路径,并基于功率灵敏度确定单个电源对过载线路的影响大小;然后,建立以系统电源损失出力最小和保护动作后系统安全裕度最大为目标的多目标优化模型,通过优化电源出力和保护动作量实现电源出力损失最小和系统安全裕度最大,减少因源荷波动造成保护频繁动作;最后,以某一山区电网为算例进行仿真验证,计算结果表明所建立的模型能够实现电源出力损失最小和系统安全裕度最大的目标。Many small hydropower stations in mountainous power grids have a light load.When combined with the integration of a large number of new energy sources,this can cause the transmission section to be overloaded during the summer peak season,limiting the export of clean energy and threatening the safety of power grid equipment.To address this issue,a protection action strategy that coordinates overload protection with adjustable power sources is proposed to achieve optimal control effectiveness.Firstly,the power transmission path from the power source to the cross-section is determined based on the current tracking method,and the impact of a single power source on the overload line is determined based on power sensitivity analysis.Subsequently,a multi-objective optimization model is established to minimize system transmission power loss and maximize system safety margin after protection action.The approach aims to maximize system safety margins by optimizing power output and protection action while minimizing the frequency of protection actions required.Finally,simulation verification is carried out using a power grid in a specific mountainous area,as an example,demonstrating the effectiveness of the established model.

关 键 词：山区电网 线路过载保护 潮流追踪法 功率灵敏度 清洁能源外送 

分 类 号：TM773[电气工程—电力系统及自动化]