Abstract: Cascaded H-bridge inverter has been widely used because of its advantages such as small number of devices, easy of modularization and high degree of control freedom. However, under traditional multilevel modulation strategy, the coordinated control of power balance between cascaded cells and optimal line voltage harmonic characteristics cannot be achieved. Power unbalance or poor output voltage harmonic characteristics will directly affect inverter output voltage waveform quality. In order to overcome this problem, a power balance control strategy, which is based on carrier disposition modulation method and pulse circulation in half a fundamental period, was proposed. The general law of carrier distribution under power balance condition was revealed and the power balance control method can be applied to n-cells topology. The proposed method can not only ensure the relatively optimal harmonic characteristics of inverter output voltage, but also achieve power balance control between cascaded cells, so the adverse effects of power unbalance is eliminated. Simulation and experimental results verify the effectiveness of proposed solution.