Power equalization method of CHB multilevel inverter based on carrier reconfiguration
Aiming at the disadvantage of the unbalanced output power of four units of Cascaded H-bridge(CHB)nine-level inverter under traditional carrier amplitude shift modulation,an improved power equali-zation strategy is proposed based on carrier reconstruction in this paper,which can effectively reduce the number of carriers.Through the secondary power equalization process,the output power equalization a-mong the four units of the cascaded H-bridge nine-level inverter is realized.First,the power balance be-tween the four units is realized by the carrier reconstruction method,and then the actual drive signal of the switch tube is obtained by performing a 1/4 cycle logic interchange of the drive signal of the switch tube,to realize the power balance of the whole unit under full modulation Simulation and experimental results show that this strategy can achieve a power balance of four cascaded H-bridge units based on effectively re-ducing the number of carriers.
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