实际系统次同步谐振建模方法  

Subsynchronous Resonance Modeling Method for Real Systems

作　　者：董德勇[1] 陈武晖[1] 张军[1] 谭伦农[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏省镇江市212013

出　　处：《电网技术》2015年第4期1059-1066,共8页Power System Technology

基　　金：国家自然科学基金项目(51277089)~~

摘　　要：传统次同步谐振建模方法不能确保所建立的模型分析结果能够满足工程实际的精度需求。文中分析了传统次同步谐振建模方法不精确的本质原因是等值阻抗频率特性不能反映原系统的阻抗频率特性。根据等值阻抗频率特性误差大小的分布规律,提出通过逐渐扩大建模区域,以次同步模态阻尼收敛为判据来建立实际系统次同步谐振模型的新方法。该方法以系统节点处等值产生的次同步谐振误差大小为原则确定每次建模模型的边界,最终获得合理的建模区域。应用修改的IEEE 39节点系统,研究了不同的建模规模对次同步谐振分析结果的影响,验证了建模方法的有效性。It cannot be ensured that the analysis results from the model established by traditional modeling method for subsynchronous resonance （SSR）, could meet the demand on the accuracy in engineering practice. This paper investigates the major reason that the frequency dependent characteristics of the equivalent impedances cannot represent ones of the original system, which results in errors for traditional model in studying SSR. Based on the error distribution laws, a new method is proposed to establish the SSR model from the real system by enlarging step by step the boundaries of the extracted modell When the subsynchronous modal damping converge between the different scale models, the suitable scale model is obtained. According to the errors distribution law caused by the equivalent impedance at the different nodes in the system, the proposed method can identify the modeling proper boundary. By using the modified IEEE39 Bus system, the errors of the different scale model are assessed, and the proposed modeling method for SSR is validated.

关 键 词：次同步谐振 传统建模方法 阻抗频率特性 新建模方法 

分 类 号：TF721[冶金工程—钢铁冶金]