基于磁链平衡方程的变压器保护的关键问题的研究  

Study on the key issues of transformer protection based on magnetism-chain balance equation

作　　者：张志强 哈恒旭[2] 谭雨珍[2] 

机构地区：[1]德州供电公司,山东德州253000 [2]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《电力系统保护与控制》2009年第14期1-5,9,共6页Power System Protection and Control

基　　金：国家自然科学基金资助项目(50707002);山东省教育厅科技计划项目资助(J06B06)~~

摘　　要：变压器是电力系统中的枢纽关节,是电力系统的重要组成部分。在查阅大量参考文献的基础上,分析了变压器保护的现状,并在基于变压器模型的变压器保护原理基础上,提出一种基于变压器磁链平衡方程的变压器保护原理,并分析了其理论可靠性。该原理采用带有遗忘因子的最小二乘法实现变压器绕组参数估计,提高了参数估计收敛的快速性。另外,该原理应用基于投影变换理论的微分算子变换方法克服差分变换引起的误差。通过初步的理论分析,该保护方案通过准确、快速的实现变压器绕组参数的辨识估计,以及基于投影变换理论的微分算子变换,能够准确地确定保护的动作整定值Kzd。Transformer is the hinge joint of power system, which is also the important part of power system. Based on many references, this paper analyzes the actuality of transformer protection. According to the transformer model-based transformer protection principle, this paper brings forward a novel principle, which is based on the magnetism chain balance equation, and discusses the feasibility theoretically. The principle applies the recursive least-squares theory with oblivious factor to estimate transformer parameter. So the rate of estimate constringency will be enhanced. In addition, the principle uses differential coefficients transform method based on projection transform to overcome the errors which are caused by difference transform. Through primary analysis theoretically, this protection scheme can confirm the acting value of protection Kzd exactly via distinguishing the parameter of transformer accurately and fleetly and realize the differential coefficient transforming based on projection transform.

关 键 词：变压器保护 磁链平衡方程 遗忘因子 最小二乘法 投影变换 

分 类 号：TM772[电气工程—电力系统及自动化]