Transformerless single-phase multilevel inverter for grid tied photovoltaic systems
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abstract
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Single-phase transformerless photovoltaic (PV) inverters have become more widespread in the solar energy market. This is due to the higher efficiencies they achieve together with the very low ground currents, which are their main advantages. In this paper a multilevel transformerless single-phase topology, based on the H-bridge with an active clamping, is proposed. Multilevel output voltage is achieved by using a split DC link and an active bidirectional switch to clamp the first leg in the H-bridge circuit. Therefore, a good behavior is achieved regarding total harmonic distortion (THD). A sinusoidal based pulse width modulation (PWM) strategy is also proposed to control the power converter. Numerical results show that the proposed PV inverter complies with the transformerless norms and regulations, operating with high efficiency, and being suitable for the transformerless PV inverters market. © 2014 IEEE.
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keywords
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leakage current; multilevel power inverters; PV generation system; transformerless grid connected inverter Bridge circuits; Commerce; Counting circuits; Industrial electronics; Leakage currents; Photovoltaic cells; Pulse width modulation; Solar energy; Solar power generation; Voltage control; Bidirectional switch; Grid connected inverters; Multilevel inverter; Multilevel power; Photovoltaic inverters; Photovoltaic systems; PV generation; Total harmonic distortion (THD); Electric inverters
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