Abstract
Photovoltaic (PV) generation system has attracted wide attention in recent years to convert the solar energy into electricity in a clean way. Two-stage grid-tied single-phase inverters with a Boost stage and an H-bridge stage are potential for PV generation system with simple structure, high extensibility and wide Maximum Power Point Tracking (MPPT) range. Besides, the two stages can be optimized individually to achieve the best performance. However, applying unipolar modulation on the H-bridge may introduce large leakage current so bipolar modulation had to be chosen, resulting in large magnetic hysteresis loss and switching loss. To reduce these losses, a hybrid modulation method for the H-bridge stage combining both the features of bipolar and unipolar modulation is proposed in this paper. With the proposed modulation method, the H-bridge stage is modulated to cooperate with the Boost stage. The overall efficiency can be optimized and meanwhile the leakage current can be well suppressed. The design consideration of the proposed method is presented and the validity is verified by experimental results from a 1kW prototype.
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