TCSC采样-数据模型在次同步振荡分析中的适用性研究  

Suitability study of sampled-data model of TCSC for SSO analysis

作　　者：向昌明[1] 吴熙[2] 蒋平[2] 

机构地区：[1]江苏方天电力技术有限公司,江苏南京211102 [2]东南大学电气工程学院,江苏南京210096

出　　处：《电力系统保护与控制》2013年第23期55-60,共6页Power System Protection and Control

基　　金："十一五"国家科技支撑计划项目(2008BAA13B07)~~

摘　　要：由于电力系统次同步振荡(SSO)问题要分析的是既非工频又非低频的成分,故不能采用工频准稳态模型或认为工频电量上有低频调制来进行分析,使用的TCSC动态数学模型必须在整个次同步振荡范围内都有效,因此TCSC动态模型适用性验证的工作非常重要。提出通过对比含TCSC系统在整个次同步频域内的阻尼特性来验证TCSC动态模型的适用性。一方面,TCSC采用采样-数据模型,运用小扰动分析法建立系统的状态空间矩阵,并通过矩阵变换直接求取系统的电气阻尼特性;另一方面,在PSCAD中搭建系统时域仿真模型,TCSC模型精确到器件级,然后采用测试信号法获取系统的电气阻尼特性;最后,将两种方法获得的电气阻尼进行对比。结果表明:基于TCSC采样-数据模型较为精确,适用于次同步振荡问题的分析。Since frequency of the analysis component of Subsynchronous Oscillation （SSO） problem is neither at the power frequency nor within the range of low frequency, Quasi-Steady-State （QSS） model cannot be used to analyze SSO. For the same reason, we also cannot consider the analysis component of SSO as electricity signals at power frequency with low frequency modulation to analyze SSO problem. The dynamic model TCSC must be effective throughout the whole frequency range of SSO. Hence, verification of the suitability of TCSC dynamic model is of great significance. This paper proposes a method to verify the suitability of TCSC dynamic model through comparing damping characteristics throughout the whole frequency range of SSO. On one hand, sample-data model of TCSC is adopted, and small signal analysis method is utilized to establish state space matrices of system. Then a series of matric transformation is applied so as to obtain electrical damping characteristics of system. On the other hand, time simulation model is constructed in PSCAD, where the model of TCSC is precise to the device-level. Then, test signal method is adopted to obtain electrical damping characteristics of system. Finally, electrical damping characteristics obtained by the two methods are compared. The simulation result shows that the sample-data-based model of TCSC is accurate and suitable for the analysis of SSO problem.

关 键 词：次同步振荡 TCSC 动态模型 适用性 

分 类 号：TM712[电气工程—电力系统及自动化]