基于负序评估的平衡变压器工程应用研究

Research on the Engineering Application of Balance Transformers Based on Negative Sequence Evaluation

基于负序无功补偿理论和端口电气量转换关系,研究了高速铁路Vx接线变压器和Scott平衡变压器的负序补偿程度。根据铁路变压器结构特征,分析了两种接线的优缺点。结合工程实际应用情况,比较了两种接线变压器的工程费用和运营费用。考虑到目前高速铁路电能质量评估的不同结果,给出了平衡接线变压器的适用情况。结果表明,在电能质量较差的情况下,Scott平衡接线变压器对电网负序具有有效的降低效果。

Based on the negative sequence reactive power compensation theory and the port electric quantity transformation relationship,the negative sequence compensation degree of Vx-connected transformer and Scott-balanced transformer for high-speed railway is studied.According to the structural characteristics of railway transformers,the advantages and disadvantages of the two kinds of connection are analyzed.Combined with the actual Application of engineering,the engineering cost and operating cost of the two kinds of connection transformers are compared.Considering the different results of the current high-speed railway power quality assessment,the Application of balanced connection transformer is given.The results show that in the case of poor power quality,Scott-balanced connection transformer has a simple and direct effect on the negative sequence of the power grid.