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H9 and H10 Transformer-less Solar Photovoltaic Inverters for Leakage C by Sumaya Jahan, Md Faruk Kibria et al

Now-a-days, transformer-less inverters integrating renewable energy resources as solar photovoltaic systems are commonly employed in many grid-connected distributed energy systems in both industrial and residential settings. Transformer-less photovoltaic (TLPV) inverters have attracted increased attention due to their unique advantages, such as increased efficiency, low cost, and ease of installation. Converting fluctuating solar dc power to consistent ac power has been a difficulty in the recent decade to avoid security risks like ground fault currents and leakage currents. Leakage current minimization is one of the most crucial factors in the TLPV inverters. Different TLPV inverter topologies have been presented in the past, with leakage current being reduced by galvanic isolation on the dc or ac side of the inverter, common mode voltage (CMV) clamping, and modulation techniques. This paper proposed two novel single-phase grid-tied TLPV inverter topologies with control blocks, which

A New Three-Phase Non-Isolated Photovoltaic Inverter for Suppressing L by Mohua Biswas, Shuvra Prokash Biswas et al

A novel three-phase grid-tied photovoltaic (PV) non-isolated inverter with improved performance owing to common mode current suppression as well as constant common mode voltage is presented in this paper. To compensate unexpected oscillations in stray capacitor voltage, three additional diodes are used with the full bridge circuit of traditional B6 inverter. Therefore, using total six insulated gate bipolar transistors (IGBTs) and three diodes, the proposed inverter eliminates the pitfalls of conventional grid-tied non-isolated PV inverters. Unipolar sinusoidal pulse width modulation (SPWM) method is utilized here in order to control the power switches of the presented inverter. Because of less voltage oscillations in stray capacitor, common mode voltage is hold to be constant. Consequently, extra leakage current flow is reduced significantly. The peak leakage current is found 8.184 mA and 5.132 mA RMS leakage current is recorded. The total harmonic distortions (THDs) of phase voltage

A New H7 Transformer-less Single-Phase Inverter to Improve the Perform by Mohua Biswas, Shuvra Prokash Biswas et al

Solar energy has a substantial role to play for meeting the ever-increasing energy demand. Due to some appealing features, such as higher performance, reasonable cost, and suitable power density, grid-connected transformer-less photovoltaic (TLPV) inverters have become prevalent in solar energy-based applications. This paper lays the groundwork for a new grid-connected TLPV inverter topology with reduced common mode current and improved performance. This novel inverter topology contains reduced common mode current and less total harmonic distortion (THD) with improved power quality. Midpoint clamping method is applied to eliminate extra leakage current. Unipolar sinusoidal pulse-width modulation method is used to control the power switches. The common mode voltage is held constant to reduce the common mode current to 8.03 mA. The leakage current suppression is analyzed in detail with simulation results. The switching technique does not affect the efficiency, however, reduces the leakag

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