In accordance with the problems of low utilization rate of DC-side voltage of cascaded H-bridge（CHB） multi-level inverter carrier disposition（CD） modulation strategy and unbalanced output power of each cascaded H-bridge units

a power balanced based on in-phase disposition trapezoidal pulse width modulation（IPD-TPWM） strategy is proposed in this paper. By selecting an appropriate trapezoidal wave triangulation rate δ

the modulation strategy can greatly increase the amplitude of output line voltage fundamental wave of CHB inverter while ensuring the waveform quality of output phase voltage; meanwhile

by changing the arrangement of the triangular carriers

the power of each H-bridge unit in one output period is achieved within the full modulation ratio range Equilibrium. Therefore

this modulation strategy solves the problems of low utilization of DC voltage and unbalanced output power of all levels of interconnection units. Moreover

the power balance control method is relatively simple

which simplifies the difficulty of control and can be easily applied to N-level CHB inverters. Finally

the Matlab/Simulink simulation model and experimental platform are built. The simulation and experimental research verify the validity and practicality of the modulation strategy.