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基于输电线路有功功率损耗的软DTR实现

发表时间:2017-10-31  浏览量:1471  下载量:199
全部作者: 汝绪丽,陈芳,张健,宋士瞻,张辉,张强
作者单位: 济南大学自动化与电气工程学院;国网山东省电力公司枣庄供电公司;国网山东省电力公司
摘 要: 通过直接估计输电线路电阻实现软动态热定值(dynamic thermal rating,DTR)功能,存在难以精准把握的问题,因而提出将输电线路的最高允许温度转化为有功功率损耗的限制,从而确立输电线路短期热定值的方法。以输电线路热平衡方程中的环境参量作为状态变量,根据输电线路有功功率损耗与电阻、温度的耦合关系,推导出输电线路有功功率损耗变化的微分方程,以此建立系统的量测方程;同时,考虑热平衡方程式参数变化的迟缓性,建立状态变量空间表达式;继而依据输电线路有功功率损耗变化率,采用卡尔曼滤波的方法,实现对状态变量的估计。由此,完成了输电线路软DTR的功能,为输电线路短期最大电流运行方式是否可行提供了解决依据。并以山东某220 kV输电线路的实测数据为例,验证了本文方法的可行性与有效性。
关 键 词: 电气工程;输电线路;软动态热定值;有功功率损耗;温度估计
Title: Soft DTR realization based on the active power loss of transmission line
Author: RU Xuli, CHEN Fang, ZHANG Jian, SONG Shizhan, ZHANG Hui, ZHANG Qiang
Organization: School of Electrical Engineering, University of Jinan; Zaozhuang Power Supply Company of State Grid Shandong Electric Power Company; State Grid Shandong Electric Power Company
Abstract: Soft dynamic thermal rating (DTR) is realized by estimating transmission line resistance directly, bringing problems which is hard to grasp accurately. Thus, the transmission line short time thermal dynamic rating is set up by transforming the maximum permissible temperature condition into line’s active power loss limitation. The circumstance parameters in thermal balance equation are used as the state variables, and observation equation is from the differential equation of active power loss, which is deduced by relation between active power loss and resistance as well temperature. Meanwhile, state equation is set up according to time-delay parameters of the thermal equilibrium equation. Then, according to the active power loss rate of transmission line, state estimation is accomplished by Kalman filter. So far, the function of DTR is obtained, which supplies a solution to the short time maximum available current. The data of 220 kV transmission line in Shandong province is tested, and the result shows that the method proposed is feasible and valid.
Key words: electrical engineering; transmission line; soft dynamic thermal rating; active power loss; temperature estimation
发表期数: 2017年10月第20期
引用格式: 汝绪丽,陈芳,张健,等. 基于输电线路有功功率损耗的软DTR实现[J]. 中国科技论文在线精品论文,2017,10(20):2264-2271.
 
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