基于Levenberg-Marquadt的非线性最小二乘新型换流变压器漏感矩阵识别法  

Leakage Inductances Matrix Identification of New Converter Transformer Based on Levenberg-Marquadt Nonlinear Least Squares Algorithm

作　　者：赵志宇[1] 罗隆福[1] 许加柱[1] 李勇[1] 陈清玉[1] 张杰[1] 宁志毫[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电工技术学报》2013年第4期212-220,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51077045;50907018);国家电网公司科技项目(2008[1360])资助项目

摘　　要：在对新型换流变压器的保护研究中,漏感参数的识别尤为重要。鉴于该换流变压器的特殊绕组结构,本文首次推导出以漏感参数的矩阵形式来表征这种结构的特殊性,并提出一种基于Levenberg-Marquadt的非线性最小二乘算法用于此漏感参数矩阵识别,在对正常及各种外部故障情况下的仿真中应用该方法均正确识别了漏感参数矩阵,且求得的参数误差很小,而对各种内部故障情况下漏感参数矩阵的辨识误差较大,能有效地与前者区分。该漏感参数的识别方法不仅能降低数学建模的冗余性,而且还能处理新型换流变压器的电压电流数据中的共线性问题,从而准确快捷地识别出漏感参数矩阵,并且避免识别过程陷入局部最优。本文提出的新型换流变压器漏感参数的快速识别方法,为进一步研究新型换流变压器的保护打下一定的理论基础。Leakage inductance parameters identification is very vital for new converter transformer protection. Because of the particular winding scheme of new converter transformer, a matrix form of leakage parameters is deduced to represent this particularity, meanwhile, and a nonlinear least squares method based on Levenberg-Marquadt algorithm applying on the parameters matrix identification is proposed. Simulation results in normal and various external fault situations show that the leakage parameters can be identified correctly. And the identification errors are small, which are large in internal faults, so the results identified by this method can differentiate internal faults from the former exactly. The identification method of leakage inductance parameters can not only reduce the redundancy of mathematical modeling, identify the parameters matrix quickly and accurately, but also deal with collinear problem in voltage and current data of new converter transformer, so that it can identify the parameters matrix quickly and accurately and avoid falling into local optima in the identification process. The rapidly identification method for leakage inductance parameters of new converter transformer proposed in this paper makes a certain theoretical foundation laid for its further protection research.

关 键 词：换流变压器 参数辨识 漏感 非线性最小二乘 共线性 

分 类 号：TM42[电气工程—电器]