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Analysis And Mitigation Of Temporary Over-Voltage (Tov) Phenomenon In Unintentionally Islanded Grid-Connected Photovoltaic (Pv) Inverters, Md Maruful Islam
Analysis And Mitigation Of Temporary Over-Voltage (Tov) Phenomenon In Unintentionally Islanded Grid-Connected Photovoltaic (Pv) Inverters, Md Maruful Islam
Electronic Thesis and Dissertation Repository
Grid-connected photovoltaic (PV) solar systems, like other inverter-based distributed generators, can cause temporary over-voltages (TOVs), especially subsequent to faults and unintentional islanding incidents, and can damage equipment and customers within the host distribution network. Thus, this thesis aims to study the phenomenon and propose corrective measures for it. Thus, the thesis first presents detailed models for a conventional single-stage PV system and a modified single-stage PV system. The conventional system uses a Δ/YG isolation transformer, whereas the modified system, proposed in the literature, assumes a Y/YG isolation transformer that is effectively grounded by an additional half-bridge leg energized by the …
Enhanced Voltage-Sourced Inverters For Large-Scale Grid-Connected Photovoltaic Systems, Hamidreza Ghoddami
Enhanced Voltage-Sourced Inverters For Large-Scale Grid-Connected Photovoltaic Systems, Hamidreza Ghoddami
Electronic Thesis and Dissertation Repository
This thesis is mainly focused on (i) modeling of large-scale PV systems in order to study the factors that influence the capacity, efficiency, power quality and safety in connection with the power grid and (ii) proposing system- and circuit-level solutions and control strategies/techniques to improve the aforementioned factors. To that end, a model for PV array is developed to study the mismatch power loss in different PV array interconnection methods, especially during the partial shading condition. Further, a two-MPPT structure is proposed to reduce the mismatch power loss in centrally structured PV systems. Then, a single-stage VSC-based system is proposed …