摘要
工业配电网存在的不对称负载使得系统线损大幅增加,不同于现有的曲折接线配电变压器,提出一种新型曲折接线负荷平衡变压器。阐述了该变压器的基本原理和接线方案,导出了一、二次侧绕组的电压、电流转换方程,得到一次侧中性点电流为零的阻抗约束关系。分析了不对称运行时的零序特性及负载电流转移特性,并引入不平衡线损系数探求负载电流转移特性对配电网线损的影响。仿真及数据分析表明,该变压器能有效抑制电压零点漂移、降低不平衡线损,验证了理论分析的正确性和可行性。
Asymmetric loads in industrial distribution power system could result in line loss increasing significantly.Different from the traditional zig-zag distribution transformer,a novel zig-zag load balance transformer was presented.This paper expounded the basic principle,the connected scheme,the voltage and current transformation equation between the primary windings and second windings. The constrained relationship of impedance was deduced,which ensures that the neutral current in the primary side is zero. The characteristics of zero sequence eliminating and load current transferring under asymmetric operation were analyzed. The impact of load current transferring on line loss was explored with the introduction of distribution network unbalanced line loss coefficient. Simulation data analysis reveals that the load balance transformer could suppress voltage drift and reduce unbalanced line loss. The results verify the validity and feasibility of the theoretical analysis.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第10期34-40,47,共8页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(51477046)
湖南省战略性新兴产业科技攻关项目(2014GK1037)
国家高技术研究发展计划(863计划)项目(2012AA051704)
关键词
曲折形绕组接线
负荷平衡变压器
负载电流转移特性
不平衡线损
zig-zag winding connection
load balance transformer
load current transferring characteristic
unbalanced line loss
