An improved proportional pulse compensation strategy for DC voltage balance of cascaded H-Bridge Rectifier

DC voltage balance strategy is an important control part for Cascaded H-Bridge Rectifier. Proportional pulse compensation strategy is a typical voltage balance strategy, which can realize DC voltage balance with good performance under special working condition. However, the balance effect may be influenced by load current, and it is hard for self adoption under different load conditions. This paper proposes a kind of improved voltage balance strategy through modeling analysis on the circuit on the basis of this proportional pulse compensation strategy. The load current is introduced to the regulator, so as to better realize DC voltage balance under different load conditions. Simulation and experimental results verify the proposed improved strategy.