电子电力变压器的并联运行

讨论了电子电力变压器(EPT)的并联运行问题.总结了几种EPT并联运行的结构形式,指出EPT引入电力系统后,需要考虑它与常规变压器并联运行,以及多台EPT并联运行等情况.重点分析了多台EPT并联运行时的几种均流控制策略:主从控制、集中式电流/功率偏差控制、分散逻辑控制和基于调差原理的无联络线控制.并以多台EPT交直流母线混合并联系统为基础分析了并联EPT的输入级控制策略.在MATLAB时域仿真环境下对两台EPT并联运行采用主从控制的控制方案,进行了仿真研究,结果表明主从控制下并联电子电力变压器的均流效果良好,且可以互为备用.

Parallel Operation of Electronic Power Transformer (EPT)

Electronic power transformer (EPT) is significantly different from the conventional transformer and it is of its own features when it is connected with other EPT in parallel. Types of parallel system configuration are summarized. On the basis of analysis on the types of parallel system configuration and their new features, several kinds of control schemes are proposed, such as master and slave control, power deviation control, distributed logic control and wireless control based on output droop characteristics. And the load sharing control of the input stage is also analyzed by the AC and DC hybrid parallel system with several EPTs. Finally, on the basis of a parallel system with two EPTs, the master and slave control strategy is discussed in details and simulations are provided that show the effectiveness of proposed control strategy.