基于正交分解的MOA泄漏电流有功分量提取算法  

Extracting Algorithm of Active Power Component of MOA Leakage Current Based on Orthogonal Decomposition

作　　者：段大鹏[1] 江秀臣[1] 孙才新[2] 盛戈 曾奕[2] 

机构地区：[1]上海交通大学电气工程系,上海200240 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电工技术学报》2008年第7期56-61,共6页Transactions of China Electrotechnical Society

摘　　要：监测金属氧化物避雷器(MOA)泄漏电流的根本目的在于监测MOA因老化、受潮等原因引起的有功功耗的增加和发热等状况。本文应用功率理论对MOA泄漏电流的阻性分量进行了分析,指出当电网电压存在谐波时,泄漏电流中只有与电压同形同相仅幅值相差一个比例系数的分量消耗有功功率。然后根据Fryze的经典功率理论,将泄漏电流正交分解为有功分量与无功分量。利用两者在欧氏函数空间的正交特性,提出了一种提取有功电流分量的新算法,并推导出了该算法的数字化简化公式。最后应用五次多项式拟合方法建立了正常与老化状态下MOA的数学模型,通过仿真算例验证了该算法的正确性与有效性。该算法物理意义明确,从根本上克服了电网电压谐波的影响,可用于MOA的带电检测和在线监测。The leakage current of metal oxide surge arrester （MOA） is measured for the purpose of measured the conditions of MOA. Firstly, on the analysis of leakage current of MOA using power theory, the active power component of the leakage current had same figure and phase as the nonsinusoidal voltage, but just different amplitude with that. Secondly, according to the classic power theory presented by Fryze, the leakage current was decomposed to active power component and reactive power component. Subsequently, by the orthogonal characteristic of the two components mentioned above, a novel extraction algorithm of active power component of MOA leakage current was presented, and its simplified digital formula of the algorithm was proposed. At last, the mathematic models of MOA under normal and aged condition were established respectively by the method of polynomial fitting. The simulation results show that the algorithm proposed not only has clear physical meaning, but also avoid from the affect of harmonic voltage.

关 键 词：MOA阻性电流 有功电流分量 正交分解 提取算法 

分 类 号：TM862[电气工程—高电压与绝缘技术]