基于短路容量量化评估的断面极限功率解析计算方法  

An Analytical Calculation Method for Total Transfer Capability of Transmission Section Based on Evaluation of System Short Circuit Capability

作　　者：刘瑶 李子恒 郑子萱[3] 宋东徽 李小腾 张丁 任杰 谢琦 LIU Yao;LI Ziheng;ZHENG Zixuan;SONG Donghui;LI Xiaoteng;ZHANG Ding;REN Jie;XIE Qi(Electric Power Research Institute of State Grid Shaanxi Electric Power Co.,Ltd.,Xi'an 710100,China;State Grid Shaanxi Electric Power Co.,Ltd.,Xi'an 710048,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]国网陕西省电力有限公司电力科学研究院,陕西西安710100 [2]国网陕西省电力有限公司,陕西西安710048 [3]四川大学电气工程学院,四川成都610065

出　　处：《中国电力》2025年第3期98-107,共10页Electric Power

基　　金：国家自然科学基金资助项目(直流故障下大规模风电送端系统暂态电压响应机理与引导式防御机制,52277115);国网陕西省电力有限公司科技项目(陕北高比例新能源多直流外送型电网耦合特性及优化控制技术研究,5226KY23001Y)。

摘　　要：直流送端电网中,系统短路容量主要由常规机组提供,当常规机组开机方式变化导致短路容量变化时,将对系统安全稳定特性造成重要影响。现有断面极限功率计算方法在校验系统安全稳定性时,往往忽略短路容量这一关键变量,因而无法准确表征常规机组开机方式对断面极限功率的影响,计算结果准确性难以保证。鉴于此,提出一种基于短路容量量化评估的断面极限功率解析计算方法。首先,构造计及短路容量的系统安全稳定约束条件;然后,提出常规机组对系统短路容量的贡献指标,并基于该指标和安全稳定分析结果,提出一种断面极限功率解析计算方法;最后,以中国西北某电网为例进行分析,验证了所提方法的有效性以及准确性。In the HVDC sending-end system,the system's short-circuit capacity is mainly provided by conventional generating units.When the operating mode of conventional generating units changes and the short-circuit capacity changes,it will have a significant impact on the system's safety and stability characteristics.The existing section total transfer capability calculation methods often ignore the key variable of short-circuit capacity when verifying the system's safety and stability,which may lead to calculation errors.Therefore,this paper proposes a section total transfer capability analytical calculation method based on short-circuit capacity evaluation.Firstly,the system security and stability constraints considering the short-circuit capacity are constructed.Then,the contribution index of conventional generating units to the system's short-circuit capacity is proposed,and a section total transfer capability analytical calculation method is proposed based on this index.Finally,taking a certain power grid in Northwest China as an example,the effectiveness of this method is verified through case analysis in the power system analysis and simulation program.

关 键 词：输电断面 短路容量 开机方式 极限功率 功角稳定 暂态过电压 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]