联于弱交流系统的VSC-HVDC稳定运行区域研究

发布时间：2018-01-07 01:42

本文关键词：联于弱交流系统的VSC-HVDC稳定运行区域研究　出处：《中国电机工程学报》2016年01期 　论文类型：期刊论文

【摘要】：电压源换流器型直流输电(voltage source converter based high voltage direct current,VSC-HVDC)可用于联接弱交流系统,但其联于弱交流系统时的运行特性仍待深入研究。该文以VSC的交流侧稳态潮流方程为基础,归纳两种不同控制方式下VSC稳态运行时的交流侧安全稳定性约束条件,分析安全稳定判据随短路比(short-circuit ratio,SCR)的变化规律,解释VSC联于弱交流系统时无法安全稳定运行的现象,并给出求取临界短路比(critical short-circuit ratio,CSCR)的步骤流程。在此基础上,研究各种工况因素(交流等效电动势、交流等效系统阻抗、VSC运行方式等)不同时VSC的CSCR,并和PSCAD的仿真结果进行对比验证。最后,总结VSC的CSCR的主要制约因素,并给出各种运行方式下CSCR的典型范围。
[Abstract]:Voltage source converter DC transmission (. Voltage source converter based high voltage direct current. VSC-HVDC can be used to connect weak AC systems, but its operating characteristics when connected to weak AC systems need to be further studied. This paper is based on VSC's AC side steady state power flow equation. The constraint conditions of AC side safety stability of VSC under two different control modes are summarized, and the short-circuit ratio with short-circuit ratio is analyzed. The variation rule of SCRs explains the phenomenon that VSC can not operate safely and stably when it is connected to weak AC system. The procedure of obtaining critical short circuit ratio (CSCR) is also given, on the basis of which the critical short circuit ratio is obtained. Various operating conditions (AC equivalent EMF, AC equivalent system impedance / VSC operation mode, etc.) are studied at different time, and compared with the simulation results of PSCAD. Finally. The main restrictive factors of VSC's CSCR are summarized, and the typical range of CSCR under various operation modes is given.
【作者单位】：浙江大学电气工程学院;
【基金】：国家863高技术基金项目(2012AA050205)~~
【分类号】：TM721.1
【正文快照】： 方式下CSCR的典型范围。0引言电压源换流器型直流输电(voltage sourceconverter based high voltage direct current,VSC-HVDC)采用可关断电力电子器件,无需借助外部电源便可实现自换相,因此具备向弱交流系统供电的能力[1-4]。目前研究发现,VSC-HVDC和传统直流输电系统类似,短

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