基于整体能量分配的级联整流级电压平衡控制的研究

The Voltage Balance Control Research for Cascaded Hbrldge Rectifier Based on Integral Power Distribution

本文介绍了新一代无工频变压器大功率变换器的结构及特点,分析简化了该变换器级联整流级的电路模型。引入单相坐标变换的理论,对级联整流级在该坐标变换下的数学模型进行了详细的推导。提出了一种系统整体有功能量分配的控制方法,用于平衡级联整流级各模块直流侧的电压。仿真结果表明,该平衡策略能够较好平衡级联整流级各模块直流侧的电压,有效控制系统的有功和无功,实现整流系统单位功率因数的要求。

This paper describes a new generation cascade power converter without line-frequency transformer, analyzes its structure and characteristics, simplifies the circuit model of cascade rectifier stage. The mathematical model of cascaded rectifier stage is set up based on Single-Phase Rotating Frame. This paper proposes a balance strategy for DC voltage of each cascade class by distributing the whole active power. The simulation results indicate that this proposed strategy can better balance the DC voltage of every module, control the active or reactive power of the system effectively, realize the unity power factor of rectifier stage.