电流型双向多脉冲变流器

提出了两种电流型双向多脉冲变流器的拓扑结构,实现了传统多脉冲整流器能量的双向流动。当其运行于逆变器状态时,变流器等效为一个电流型多重化逆变器,相较于传统分立式电流型多重化逆变器,此变流器具有电源与磁性元件数量少、系统体积小等优点。以18脉冲双向变流器为例,详细介绍了其工作原理,求出了18脉冲变流器总谐波失真(Total harmonic distortion,THD)最小时,各电平作用角度,提出了一种脉宽调制方式以实现交直流侧电压电流调节。最后通过仿真与硬件实验验证了所提系统的可行性。

Bi-directional Current Multiple Pulse Converter

Two bi-directional-current multi-pulse converter topologies are proposed, which can achieve a bi-directional flow of energy in the traditional multi-pulse rectifier. When it is operating in the inverter state, the converter is equivalent to a multiplex current type inverter. Compared with traditional discrete current-multiplex inverter, the inverter has less number of the power and magnetic elements, and smaller size of the system. In this paper, a bi-directional 18-pulse converter is taken for example, and its working principle is introducted and the effect of the level angle is obtained with the minimum total harmonic distortion (THD) of a 18-pulse converter. A pulse-width modulation to achieve the voltage and current regulation in the AC and DC sides is proposed. Finally, simulation and hardware experiments verify the feasibility of the proposed system.