基于准稳态模型的特高压半波长交流输电系统稳态特性与暂态稳定研究  

Study on the Steady State Characteristic and Transient Stability of UHV AC Half-wave-length Transmission System Based on Quasi-steady Model

作　　者：秦晓辉[1] 张志强[1] 徐征雄[1] 张东霞[1] 郑健超[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2011年第31期66-76,共11页Proceedings of the CSEE

基　　金：国家电网公司科技项目(ZXT2010-029)~~

摘　　要：特高压半波长交流输电是一项很有吸引力和前瞻性的远距离大容量输电技术,其稳态特性和暂态稳定研究是其可行性应用研究的基础。首先根据传输线和二端口理论推导出可用于潮流和稳定工程计算的特高压半波长交流线路的准稳态模型;然后在潮流计算的基础上,得出半波长线路的稳态运行特性,并从入、反射波与无功需求2个方面对其电压分布特性进行深入分析。在大量暂态稳定工程计算的基础上,提出特高压半波长交流输电系统的暂态稳定极限和输电能力,并研究最严重故障点和频率变化对系统暂态稳定极限的影响。研究成果对特高压半波长交流输电系统的可行性研究和未来试验工程的实施提供了有力的技术支撑。Ultra high voltage（UHV） half-wave-length alternating current（AC） transmission technology is an attractive and promised technology for long-distance bulk power transmission.And the study on its steady state characteristic and transient stability is the foundation of its feasibility study.Firstly,the quasi-steady model of a half-wave-length AC transmission line which can be adopted in power flow and transient stability engineering calculation was deduced according to transmission line theory and two-port network theory.Secondly,on the foundation of power flow calculation,the steady state operation characteristic of UHV half-wave-length transmission lines was obtained,and the voltage distribution characteristic was analyzed thoroughly from the aspects of incident,reflected wave composition and reactive power demand.Thirdly,on the foundation of a great deal of transient stability calculation,the transient stability limit and transmission capability of UHV half-wave-length transmission lines was proposed,and the impact of the severest contingency point and the frequency variation on transient stability was investigated.The achievements of the paper provide the powerful technical supports for the feasibility research and the implementation of future testing project of UHV half-wave-length transmission system.

关 键 词：半波长 特高压 输电线路 准稳态 电压特性 暂态稳定 

分 类 号：TM72[电气工程—电力系统及自动化]