1-ϴ grid connected transformer that can work in either a buck or boost mode with a less photo voltaic (PV) inverter, and that can simultaneously derive full power from two serially connected subarrays when each subarray faces different environment conditions, is introduced in this paper. Since the inverter can act both in buck and boost mode based on specifications, it significantly reduces the restriction on the minimum number of serial attached solar pv modules required for forming a subset. As a consequence, the power output of each subfield increases when subjected to varying environmental conditions. The topological structure and the control strategy of the inverter are designed to avoid high frequency components being present in the typical mode voltage, thereby limiting the degree of the PV arrays' leakage current within the stated limit. In comparison, high operational performance is obtained across its spectrum. The mechanism leading to the development of its mathematical model is studied in depth. Detailed modelling experiments confirm the feasibility of the scheme.
Key words: Grid connection, 1-phase, Transformer less, Buck and Boost, MPPT.
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