适合直流配电的有源前端控制器

Active front-end controller for DC distribution

为使用户侧大量新能源能够充分地发挥作用并可对其有效管理,提出一种基于有源前端控制器的直流供电系统结构,在该结构中结合电力电子技术与高频隔离技术将配电降压变压器与低压AC-DC变换器一体化设计为有源前端控制器,以完成中压交流配电网与低压直流网之间功率相互变换的过程。给出了有源前端控制器的基本类型及不同类型的实际应用。详细探讨了基于输入串联输出并联的级联型有源前端控制器的系统拓扑结构及其各自模块功能特点。通过基于双升压/降压全桥式变换器与CLLC谐振型直流变换器模块的级联型有源前端控制器小型实验系统验证了整体系统结构的可行性和控制策略的有效性。

A DC distribution system architecture based on AFEC（Active Front-End Controller） is proposed to effectively employ and manage the renewable energy resources at customer side,which adopts the AFEC designed based on power electronics technique and high-frequency isolation technique to integrate the distribution step-down transformer with the AC-DC converter for the power conversion between medium- voltage AC grid and low-voltage DC grid. The basic types and different practical applications of AFEC are introduced. The system topology of cascaded AFECs with series inputs and parallel outputs,as well as the functions of its different modules,are analyzed in detail. A small experimental system based on the cascaded AFECs integrating dual Boost/Buck full-bridge converter with CLLC resonance module is built to verify the feasibility of theoverall system architecture and the validity of its control strategy.