描述直流孤岛送电系统的3个指标

发布时间：2018-01-25 03:38

本文关键词： 直流孤岛过电压功率极限频率稳定技术指标　出处：《高电压技术》2017年01期 　论文类型：期刊论文

【摘要】：送端电网采用直流孤岛运行方式,能有效解决大容量直流双极闭锁后大规模潮流转移导致的交流主网暂态稳定问题,但缺陷是送端系统自身的短路比和等效惯性常数较联网时显著减小,承受扰动能力较弱,因此,定量评估这类直流孤岛送电系统的强弱对直流工程的规划与运行具有重要指导意义。基于直流孤岛送电系统等效模型,考虑发电机电压调节器的作用,详细阐述了不同时间尺度下送端交流系统的戴维南等效电压源与等效阻抗的取值原则,并在PSCAD/EMTDC中搭建简化系统验证其正确性。在此基础上,提出了交流系统暂态阻抗、交流系统稳态阻抗以及等效惯性常数3个指标,分别用来描述直流孤岛送电系统的暂态过电压水平、直流功率输送能力以及频率暂态性能。3个指标可以直观体现直流孤岛送电系统的一些运行特性,从而实现对直流孤岛送电系统强弱的定量评估。
[Abstract]:The DC island operation mode is adopted in the power supply network, which can effectively solve the transient stability problem of the AC main network caused by the large-scale power flow transfer after the large capacity DC bipolar latching. However, the defect is that the short-circuit ratio and the equivalent inertia constant of the feed system are significantly reduced compared with those of the network, and the ability to withstand disturbances is weak. Quantitative evaluation of the strength of this kind of DC isolated island power transmission system is of great significance to the planning and operation of DC engineering. Based on the equivalent model of DC isolated island power transmission system, the role of generator voltage regulator is considered. The principle of determining the equivalent voltage source and equivalent impedance of the terminal AC system at different time scales is described in detail. The simplified system is built in PSCAD/EMTDC to verify its correctness. On the basis of this, three indexes of AC system transient impedance, AC system steady-state impedance and equivalent inertia constant are proposed. They are used to describe the transient overvoltage level, DC power transmission capacity and frequency transient performance of DC islanding power transmission system. 3 indexes can directly reflect some operating characteristics of DC islanding power transmission system. In order to realize the quantitative evaluation of DC isolated island power transmission system.
【作者单位】：浙江大学电气工程学院;
【分类号】：TM721.1
【正文快照】： 0引言西电东送是我国能源发展的重要战略,而传统直流输电技术因其固有的技术和经济优势,在远距离大容量输电场合发挥了举足轻重的作用[1-2]。但是,大容量直流双极闭锁引起的潮流转移,会对交直流并联系统的安全稳定运行造成极大威胁。送端系统断开与主网交流联系,即采用直流孤

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