Conventional Energy Resources (CER) are being rapidly replaced by Renewable Energy\nResources (RER) due to their abundant, environmentally friendly, clean, and inexhaustible nature.\nIn recent years, Solar Photovoltaic (SPV) energy installation is booming at a rapid rate among\nvarious RER. Grid-Connected PVS required advance DC-link controllers to overcome second\nharmonic ripple and current controllers to feed-in high-quality current to the grid. This paper\nsuccessfully presents the design of a Fuzzy-Logic Based PI (F-PI) and Fuzzy-Logic based Sliding\nMode Controller (F-SMC) for the DC-link voltage controller and Proportional Resonant (PR) with\nResonant Harmonic Compensator (RHC) as a current controller for a Single-Phase Two-Stages Gridconnected\nTransformerless (STGT) Photovoltaic (PV) Inverter. The current controller is designed\nwith and without a feedforward PV power loop to improve dynamics and control. A Second Order\nGeneral Integral (SOGI)-based Phase Lock Loop (PLL) is also designed that has a fast-dynamic\nresponse, fast-tracking accuracy, and harmonic immunity. A 3 kW STGT-PV system is used for\nsimulation in Matlab/Simulink. A comparative assessment of designed controllers is carried out\nwith a conventionally well-tuned PI controller. The designed controllers improve the steady-state\nand dynamic performance of the grid-connected PV system. In addition, the results, performance\nmeasure analysis, and harmonics contents authenticate the robustness, fastness, and effectiveness\nof the designed controllers, related to former works.
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