Abstract—The commonly observed trend in photovoltaic (PV) inverter technology is the usage oftransformerless topologies in order to acquire higher efficiencies combining with very low ground leakage current. Usually converter topologies such as buck, boost, buck-boost, sepic, flyback, push pull etc. are used in a Grid Connected Photo-voltaic System (GCPVS). Loss factors such as irradiance, temperature, shading effects etc. have zero loss in a two stage system, but additional converter used will lead to an extra loss which makes the single stage system more efficient when compared to a two stage systems. In this paper a new inverter topology for single stage PV system is proposed. The proposed inverter is synthesized from an inverting and non-inverting Cuk inverter where the diodes are replaced with controllable switches. Here the number of switches are reduced thereby minimizing the switching losses. Sliding Mode Controlled (SMC) maximum power point tracking method is used here. The sliding mode controller is given the estimated maximum power point as a reference which enables it to track that point and force the PV system to operate in this point. The proposed inverter topology for an 80W system was designed and simulation was done in MATLAB-Simulinkand the simulation results are included.
IndexTerms—Inverting and Non-inverting Cuk converter, transformer-less inverter, reduced number of switches,SMC- MPPT, PV-grid system.
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