Improved three phase H-7 transformerless inverter with DPWM to reduce leakage current using CNN based deep learning technique

Suganthi Ramasamy

;Maruthupandi

2023-01-01

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Abstract

This investigation presents the three-phase Transformerless Inverters (TLI) for a solar photovoltaic (PV) system connected to a high power grid will be implement with better performance and lower cost. Many clamping topologies are developed in the single phase TLI solar PV system and have proven that they are better than the unclamped inverter topologies. In this proposed research, different DC decoupled transformerless inverter topologies with modified discontinuous PWM technique are derived from three phase H-7 transformerless inverter topologies respectively. Further, active switch and diode-based clamped topologies are proposed in addition. This topology certainly minimizes the fluctuations in the common mode voltage of the inverter during zero voltage state. Meanwhile it creates the path for leakage current flow in the off state grid voltage. Evaluations of leakage current and comparative analysis over the performance in terms of reactive power capability; switching and conduction losses of the device and total harmonic distortion are made for DC decoupled inverter and H-7 transformerless inverter. The validation of the proposed work is realized through the laboratory experiment and MATLAB/SIMULINK platform as well.