配电变压器三相不平衡附加损耗量化分析  

Quantitative analysis on three-phase unbalanced additional loss of distribution transformer

作　　者：李智立 符玲[1] 熊思宇[1,2] 邵先军 汪泽州 LI Zhili;FU Ling;XIONG Siyu;SHAO Xianjun;WANG Zezhou(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China;Chengdu Power Supply Company of State Grid Sichuan Electric Power Company,Chengdu 610000,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310000,China;Haiyan Power Supply Company of State Grid Zhejiang Electric Power Company,Jiaxing 314300,China)

机构地区：[1]西南交通大学电气工程学院,四川成都611756 [2]国网四川省电力公司成都供电公司,四川成都610000 [3]国网浙江省电力公司电力科学研究院,浙江杭州310000 [4]国网浙江省电力公司海盐县供电公司,浙江嘉兴314300

出　　处：《电力自动化设备》2024年第8期124-129,共6页Electric Power Automation Equipment

基　　金：国家电网有限公司总部管理科技项目(5700-202319257A-1-1-ZN)。

摘　　要：配电网变压器三相不平衡附加损耗的计算由于缺乏对铁耗等的全面分析而精度不高。考虑到损耗治理依赖于精确有效的损耗数据,故提出计及铁耗变化的配电变压器三相不平衡附加损耗计算方法。利用磁动势平衡方程式来分析励磁磁动势和主磁通的产生过程,以建立励磁电流与一、二次侧相电流的关系。根据配电变压器的绕组联结方式建立正序、负序和零序等值电路模型,给出三相不平衡下的附加损耗计算方法。仿真测试结果表明,与现有方法相比,所提附加损耗计算方法能够量化反映三相不平衡对变压器损耗产生的影响,在不同负荷率和不同励磁阻抗参数条件下均具有更低的计算误差。The calculation of three-phase unbalanced additional loss of distribution transformer is not accurate because of the lack of comprehensive analysis of iron loss.Considering that loss control depends on accurate and effective loss data,a calculation method of three-phase unbalanced additional loss of distribution transformer considering the change of iron loss is proposed.The magnetomotive force balance equation is used to analyze the generation process of excitation magnetomotive force and main magnetic flux,so as to establish the relationship between excitation current and primary/secondary phase current.Then the positive-,negative-and zero-sequence equivalent circuit models are established according to the winding connection mode of distribution transformer and the calculation method of additional loss under three-phase imbalance is given.The simulation test results show that compared with the existing methods,the proposed additional loss calculation method reflects the influence of three-phase unbalance on transformer loss,and has lower calculation error under different load rates and different excitation impedance parameters.

关 键 词：三相不平衡 配电变压器 对称分量 附加损耗 相量估计 

分 类 号：TM401[电气工程—电器]