RESEARCH ON A HYBRID CASCADE NINE-LEVEL INVERTER AND ITS MODULATION STRATEGY
In order to solve the problem of power backflow in the traditional 1∶3 hybrid cascaded inverter,a hybrid cascaded nine-level inverter topology with coupled inductor is constructed based on the five-level rectifier.Firstly,by reconstructing the modulation wave,a hybrid modulation strategy is proposed,which combines the step wave modulation with the high frequency modulation to achieve the power balance of the two-stage unit in the partial modulation range.At the same time,through in-depth analysis of the relationship between modulation and output power,the range of step wave modulation and high frequency modulation is adjusted,and the output power balance of the two-stage unit in a wider modulation range is realized.The simulation and experimental results verify the feasibility and superiority of the constructed inverter topology and modulation strategy.
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