电网技术
電網技術
전망기술
Power System Technology
2015年
4期
1059-1066
,共8页
董德勇%陈武晖%张军%谭伦农
董德勇%陳武暉%張軍%譚倫農
동덕용%진무휘%장군%담륜농
次同步谐振%传统建模方法%阻抗频率特性%新建模方法
次同步諧振%傳統建模方法%阻抗頻率特性%新建模方法
차동보해진%전통건모방법%조항빈솔특성%신건모방법
subsynchronous resonance%previous modeling method%the frequency dependent characteristics of the equivalent impedances%new modeling method
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。
傳統次同步諧振建模方法不能確保所建立的模型分析結果能夠滿足工程實際的精度需求。文中分析瞭傳統次同步諧振建模方法不精確的本質原因是等值阻抗頻率特性不能反映原繫統的阻抗頻率特性。根據等值阻抗頻率特性誤差大小的分佈規律,提齣通過逐漸擴大建模區域,以次同步模態阻尼收斂為判據來建立實際繫統次同步諧振模型的新方法。該方法以繫統節點處等值產生的次同步諧振誤差大小為原則確定每次建模模型的邊界,最終穫得閤理的建模區域。應用脩改的IEEE 39節點繫統,研究瞭不同的建模規模對次同步諧振分析結果的影響,驗證瞭建模方法的有效性。
전통차동보해진건모방법불능학보소건립적모형분석결과능구만족공정실제적정도수구。문중분석료전통차동보해진건모방법불정학적본질원인시등치조항빈솔특성불능반영원계통적조항빈솔특성。근거등치조항빈솔특성오차대소적분포규률,제출통과축점확대건모구역,이차동보모태조니수렴위판거래건립실제계통차동보해진모형적신방법。해방법이계통절점처등치산생적차동보해진오차대소위원칙학정매차건모모형적변계,최종획득합리적건모구역。응용수개적IEEE 39절점계통,연구료불동적건모규모대차동보해진분석결과적영향,험증료건모방법적유효성。
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 model. 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.