单相组合式同相供电技术及工程应用方案研究

Research on Engineering Scheme of Single-phase Combination Co-phase Power Supply System

针对电气化铁路对电力系统负序的影响而自身不得不设置很多分相的问题,研究一种单相组合式同相供电技术方案,采用单相牵引变压器为基础,配以适量的同相补偿装置的方法,在牵引负荷较小时,能够实现由单相牵引负荷到三相电力系统的平衡变换;在牵引负荷较大时,在满足国标要求的前提下兼顾同相补偿装置的经济性。同时以工程设计案例的形式加以分析,结果表明:单相组合式同相供电技术在充分发挥同相供电自身技术优势的前提下,能够有效减少主变压器的安装容量,随着大功率电力电子元器件产品国产化后质量提升及造价逐年下降,其在提高电气化铁路运能方面的性价比将大幅提升。

In view of the fact that the traction power supply system has to have many neutral sections to reduce the negative sequence current in 3-phase power supply system,this paper focuses on a scheme of single-phase combination co-phase power supply based on single-phase transformers and moderate amount of co-phase compensation device. When the traction load is relative small,there is no negative-sequence current in the power supply system; when the traction load is relative big,the value of three-phase voltage unbalance factor meets the requirements of national standard,and the co-phase compensation device is of better economical efficiency. The engineering design scheme is analyzed in the form of engineering design. The results show that the single-phase combination co-phase power supply system can reduce effectively the installed capacity of traction transformer on condition that the technical advantages o f the co-phase power supply system are brought into full play. With the improvement of localized highpower electronic components and the decrease of cost, the cost performance of the single-phase combination co-phase power supply system will be greatly improved.