高压直流输电的采样数据动态建模  

SAMPLING-DATA APPROACH FOR HVDC DYNAMIC MODELING

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200030

出　　处：《中国电机工程学报》2004年第7期30-34,共5页Proceedings of the CSEE

基　　金：国家重点基础研究发展规划项目(G1998020310)~~

摘　　要：传统的高压直流输电(HVDC)准稳态模型不能准确描述换流器开关电路的动态特性,故运用采样-数据建模方法建立了HVDC主电路在d-q参考坐标下的小信号线性化模型:每隔1/6工频周期对系统进行采样,并通过积分推导得出采样点之间的函数关系,对该函数进行线性化得到相应的小信号模型。与传统准稳态模型不同,该模型反映了换流器开关电路在工作点受到小扰动时的动态特性。通过时域仿真证明了该模型的准确性及其适用频率范围为0～3倍工频。将该模型用于次同步振荡(SSO)的特征值分析,并与传统的准稳态模型分析结果对比,证明HVDC准稳态模型适用于SSO分析。Conventional quasi-steady model of HVDC is not able to describe the dynamic switching behavior of HVDC converters. By means of the sampling-data modeling approach, a linear time-invariant (LTI) small-signal dynamic model is developed for HVDC main circuit in the synchronous rotating d-q reference frame: taking one sample per 1/6 cycle of fundamental frequency, deriving the function between the sampled points by integrating, and linearizing the function, then the small-signal model can be obtained. In contrast to conventionally used quasi-steady model, the developed model represents the dynamic response of converter switching circuit to nominal changes in operating point. The linearized model is validated by a set of time-domain simulation and the derived suitable frequency range is 0-3 times fundamental frequency. The model is applied in SSO analysis and the results are compared with those that utilize quasi-steády model. It is proved that the quasi-steady model of HVDC is valid for normal SSO analysis.

关 键 词：高压直流输电 电力系统 采样数据 动态建模 换流器 

分 类 号：TM721.1[电气工程—电力系统及自动化]