基于采样数据模型的高压直流输电动态特性分析  

HVDC DYNAMIC CHARACTERISTIC ANALYSIS BASED ON SAMPLED-DATA MODEL

作　　者：杨秀[1] 陈陈[1] 

机构地区：[1]上海交通大学电气工程系,上海市徐汇区200030

出　　处：《中国电机工程学报》2005年第10期7-11,136,共6页Proceedings of the CSEE

摘　　要：运用采样-数据建模方法建立了12脉动换流器HVDC的小信号线性模型。该模型考虑了换流器开关电路的动态特性,适用于高频动态特性分析。利用该模型分析了HVDC控制系统与HVDC两侧交流系统对HVDC动态特性的影响,特别是高频动态特性的影响,分析结果显示:逆变站交流系统的SCR对HVDC的动态特性有较大的影响,当逆变侧交流系统的SCR过低时,系统可能出现低频不稳定;整流站控制增益过大时对系统的高频特性有不利的影响;当逆变站采用定γ角控制时,系统的高频低频稳定性都较差;证明了传统的准稳态模型不适用于HVDC的高频动态特性分析。This paper use sample-data modeling method to obtain the small-signal linear model of HVDC including 12-pulse converter. The model considers the dynamics of converter switch circuit and can be applied in the analysis for high frequency dynamic characteristics. With this model, the influences of HVDC control system and the ac system on HVDC dynamic characteristics, especially the high frequency dynamics, are analyzed, the results show that the SCR of inverter AC system has considerable impact on HVDC dynamic characteristics, too small SCR of inverter AC system can lead to low-frequency instability; the high gain of rectifier control will have adverse effect on high-frequency stability; the low-frequency and high-frequency stability will become worse with constant extinct angle (CEA) control in inverter. At last it is proved that conventional quasi-steady model of HVDC can not be suitable for analysis of high frequency dynamics in power system.

关 键 词：高压直流输电 动态特性分析 电力系统 采样数据模型 

分 类 号：TM721.1[电气工程—电力系统及自动化]