汽轮机发电机组宽频带阻抗建模及次/超同步振荡分析  

Broadband Impedance Modeling and Sub/Super-synchronous Oscillation Analysis of Steam Turbine Generator

作　　者：赵牧驰 汪海蛟 刘纯 何国庆 孙艳霞 王盼盼 ZHAO Muchi;WANG Haijiao;LIU Chun;HE Guoqing;SUN Yanxia;WANG Panpan(National Key Laboratory of Renewable Energy Grid-Integration(China Electric Power Research Institute),Beijing 100192,China)

机构地区：[1]可再生能源并网全国重点实验室(中国电力科学研究院有限公司),北京100192

出　　处：《中国电力》2024年第7期238-246,共9页Electric Power

基　　金：国家电网有限公司科技项目(双碳目标下支撑富能源弱电网型区域电力清洁低碳供应的关键技术研究与应用,5100-202136562A-0-5-SF)。

摘　　要：基于阻抗的建模与分析方法是目前分析和解决新能源并网宽频带振荡问题的有效工具之一。集中开发远距离输送是中国新能源开发利用的重要形式,在新能源基地的发电装备中,风光发电装备的阻抗模型已经较为完善,但是现有汽轮发电机组的宽频带阻抗模型均存在一定的简化,不能完整地反映汽轮发电机组的宽频带阻抗特性。基于频域小信号建模方法,建立了计及原动机、调速器、励磁系统、轴系和同步机的汽轮发电机宽频阻抗模型,在Matlab/Simulink中建立了汽轮发电机的仿真模型,通过扫频验证了所提模型的正确性,分析了不同环节对阻抗的影响,最后以汽轮发电机组经串联补偿装置并网系统为例,验证了所提模型在次/超同步振荡问题分析上的有效性。Impedance-based modeling and analysis method is currently one of the effective tools to analyze and solve the problem of renewable energy grid-connected broadband oscillation.Centralized development of long-distance transmission is an important form of renewable energy development and utilization in China.Among the power generation equipment in the renewable energy base,the impedance model of wind and solar power generation equipment has been built perfectly,but the current broadband impedance model of the steam turbine generator has some simplification,failing to completely reflect the broadband impedance characteristics of the steam turbine generator.Based on the frequency-domain small-signal modeling method,a broadband impedance model of the steam turbine generator containing the prime mover,speed governor,exciter system,shaft system,and synchronous generator was established.A simulation model of a steam turbine generator was built in Matlab/Simulink,and the correctness of the proposed model was verified by frequency sweeping.The influence of different links on the impedance was analyzed.Finally,the effectiveness of the proposed model in the analysis of the sub/super-synchronous oscillation problem was verified by studying a steam turbine generator connected to the grid via a series compensation device.

关 键 词：阻抗建模 汽轮发电机 次同步振荡 轴系建模 串联补偿 

分 类 号：TM311[电气工程—电机] TM712