单相多电平级联H桥变流器的直接功率模型预测控制研究

Model predictive control of direct power based on a single-phase muiti-level cascaded H-bridge converter

传统的电力机车交流传动系统先采用工频牵引变压器将接触网上25 kV交流电压降低后,再进行交—直—交变流。为了避免使用笨重、体积大且昂贵的牵引变压器,将试图采用单相多电平级联H桥变流器代替传统的脉冲整流器。文章以单相七电平级联H桥变流器为研究对象,研究PI-DPC控制算法,并对此进行计算机仿真。

Conventional AC drive system of electric locomotive uses power frequency traction transformer to reduce the AC voltage of 25 kV of contact network,and then the AC-DC-AC converter is carried out.To avoid the use of bulky,large and expensive traction transformers,a single-phase multi-level cascaded H-bridge converter will be attempted instead of conventional pulse rectifiers.This paper takes single-phase seven-level cascaded H-bridge converter as the research object,studies the PI-DPC control algorithm,and carries on the computer simulation to this.