摘要
为满足对变电站多端口谐波抑制的需求,研究了一种基于感应滤波技术的220kV多绕组电力变压器(multi-winding inductively filtered transformer,MWIFT)。感应滤波技术通过对变压器特定绕组的零阻抗设计,充分利用绕组间电磁传递特性,实现谐波双向屏蔽。首先,采用短路阻抗计算方法,结合零阻抗设计特征,推导出MWIFT各序等值电路。以此定义了零阻抗因子并讨论其对感应滤波效果的影响,进而提出了一种优化感应滤波性能的方法。进一步结合基本电路方程,建立了端口矩阵模型,并进行支路等效,提出了降阶端口矩阵模型,其能够简化潮流、短路等计算迭代步骤。最后,搭建实验平台,实验结果验证了所推导模型的正确性。同时将其应用于某工程案例短路电流计算,为MWIFT并网安全运行与推广应用奠定基础。
In order to eliminate multi-port load harmonics in substation,this paper proposed an inductive filtering method with a multi-winding inductively filtered power transformer(MWIFT).The inductive filtering technology made full use of the electromagnetic transmission characteristics between the windings through the zero-impedance design of the specific winding of the transformer to realize the harmonic bidirectional shielding.Firstly,Using the zero-impedance design characteristics of transformer windings and the short-circuit impedance calculation method,the equivalent circuit of MWIFT was derived.This defined the zero impedance factor and discussed its influence on the inductive filtering performance,then an improved method for optimizing the inductive filtering performance was proposed.Further,based on the basic circuit equations,the port matrix model was established and the branch equivalent was carried out.The reduced-order port matrix model was proposed,which can simplify the calculation iteration steps such as power flow and short circuit.Finally,the experimental platform was built to verify the accuracy of derived model.This application was used to calculate the short-circuit current of an engineering project case,which contributes to the development of MWIFT in power system.
作者
田野
罗隆福
李勇
黄肇
刘乾易
TIAN Ye;LUO Longfu;LI Yong;HUANG Zhao;LIU Qianyi(College of Electrical and Information Engineering,Hunan University,Changsha 410082,Hunan Province,China;Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area(Shaoyang University),Shaoyang 422004,Hunan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第9期3042-3051,共10页
Proceedings of the CSEE
基金
国家自然科学基金项目(51822702)
湖南省重点研发计划项目(2017GK2241)
湖南省科技计划项目(2016TP1023)。
关键词
多绕组感应滤波变压器
端口矩阵模型
零阻抗因子
220kV变电站
短路计算
multi-winding inductively filtered transformer port matrix model
zero-impedance factor
220kV substation,short circuit calculation
