Research a novel transformerless dual-mode voltage source inverter(VSI)in which the common ground structure short-circuits the parasitic capacitance and theoretically completely eliminates leakage currents.The inverter consists of a switching-boost-buck(SBB)module integrated with an LC filter network and has a good symmetry of the output waveform.The proposed topology features a wide input voltage range to meet the grid voltage gain,a compact structure,and a simple modulation strategy.Meanwhile,the SBB module allows for soft charging and current stress control within the permissible range.The structural characteristics and operating principle of the inverter are described in detail,a closed-loop controller is designed.The final study results show the feasibility and good performance of the proposed VSI.
photovoltaic systeminverterstransformerlessboost-buckleakage current
NETL
NSTL
维普
万方数据
