Publication: Design, modeling, and analysis of 100kw two-stage three-phase grid-connected pv generation system
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Date
2021-12-01
Authors
Mohamed Hariri, Muhammad Hafeez
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Abstract
The grid-connected PV (GPV) generation system has become a focal interest nowadays due to the fact that it offers abundant opportunities to harvest free energy sources from sunlight. Solar irradiation and the PV cell surface temperature are thetwo significant atmospheric variables that directly affect the total generation of the PV current. The main issues lie in how to deliver the maximum available power from the PV arrays where the types of its electrical parameters are in DC quantities form which later converted into the symmetrical three-phase AC utility grid without compromising the quality of the injected power. The operating point of PV oscillates in the region of the maximum power point (MPP) giving rise to the waste of energy. In addition, the existing conventional PLL synchronization mechanisms of the GPV generation system faced difficulties in providing the accurate value of grid information during fault conditions. The appropriate maximum power point tracking (MPPT) algorithms technique against absurd atmospheric conditions, proper converter switching and its topologies, suitable power filter arrangements, and the robustness of synchronization scheme in encountered the grid-line disturbances are
vital for the effectiveness of the designated 100𝑘𝑊 two-stage three-phase GPV generation system. Based on the design, system model structure, and the analysis that has been carried out in this research work, it can be concluded that the most applicable GPV generation system is the system arrangement which incorporated the Cuckoo Search (SC) MPPT technique, DC-DC boost converter, three-phase space vector pulse-width modulation (SVPWM) voltage source inverter, LCL power filters,and the CDSC grid synchronization scheme. This system is capable of providing a maximum active power of 100𝑘𝑊 from the PV arrays with the solar irradiation level of 1000𝑊/𝑚2 to the utility grid and generates low total harmonics distortions (𝑇𝐻𝐷𝑖) of 2.06% from the rated inverter input power. The introduction of the proposed controller mechanism has optimized the maximum power transfer as well as improved the dynamic response of the designated GPV generation system during unpredictable atmospheric and various types of grid fault conditions.