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20212
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Subject: Electrical Engineering × End date: 2024 × Start date: 2020 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Simulation, implementation and comparative analysis of control strategies for winddiesel generator system
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-03) Joshi, Hitesh; Swami, A.K.
    Renewable energy resources are considered as the best alternatives to conventional energy sources, worldwide. India is blessed with various renewable resources like solar, wind, biomass, hydro, tidal, etc. However, there is a large gap between demand and supply of electrical energy in India and many areas are still not having sufficient supply of electrical energy. A combination of renewable energy sources like wind-diesel available at any remote and isolated location, is sufficient for local energy demand. Installation of such hybrid systems are best solutions to provide sufficient electricity to remote and isolated villages for sustainable development. This research work focuses on the supply of power to the far distant loads where the grid is not feasible. The hybrid topology of wind-diesel is proposed to feed the local loads in isolated mode for rural electrification. Various control algorithms are implemented for satisfactory performance of this system under steady state and dynamic conditions. These algorithms provide voltage control, harmonics elimination, reactive power compensation and power balancing. The brushless generators such as, permanent magnet synchronous generator (PMSG) is used for power generation in remote areas as they are maintenance free. For the variable speed wind generation, the maximum power tracking (MPPT) is realized using perturb and observe (P&O) and tip speed ratio (TSR) approaches. The Battery Energy Storage System (BESS) is used to provide load leveling during wind fluctuations and load variations. Such hybrid systems provide power quality solutions and are able to maintain the power balancing. The diesel generator (DG) set is used with the renewable source so that during an outage when the renewable generation is not enough to meet the load demand, the DG is synchronized with the Point of Common Coupling (PCC) and starts feeding the local loads. In this way, the economic utilization of the fossil fuel resource is possible. This hybrid system is capable of supplying power to the remote places as well as to the cities during outage or emergencies. These controls are robust and are helpful in power management with power quality solutions. The satisfactory performances of these systems are demonstrated with simulation results obtained from models developed in MATLAB/Simulink environment.
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    ThesisItemOpen Access
    Design, simulation and analysis of an improved EPLL based control technique with adaptive DC link voltage regulation for grid-connected solar PV system
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-03) Matiyali, Kanchan; Goel, S.K.
    Global electrical energy consumption is steadily increasing and there is a necessity to increase the power generation capacity. Conventional power generation schemes have serious environmental issues like climate change, high oil price, and water and oil pollution. The solution to these issues could be renewable energy (RE) sources, which eliminate the harmful emissions from the conventional sources. RE sources play an important role in overcoming the trepidation over energy crisis and environmental pollution in the world. Among all the renewable energy sources, solar energy is an imperious energy source that can deliver significant amount of electrical power with abundant solar potential. In recent years, increase in use of grid connected SPV system. These systems have the merits that apart from PV power consumed by the load, excess power is sent to the existing electrical grid. To provide effectiveness and to meet the required interconnecting standards controllers play a very important role and control techniques applied to grid connected inverters are gaining more importance. This thesis is an effort to development a proposed control technique to improve power quality of the system for grid-connected SPV system. To compensate active power injected into the grid, an improved enhanced phase lock loop (I-EPLL) control technique is used. The MATLAB/Simulink model is tested under various environmental and loading conditions. To reduce switching losses in the system, an adaptive DC link voltage regulation technique is used. The proposed control technique compensates for problems like power factor correction, current unbalance and current harmonics and also inject energy generated by solar PV to the grid with a very low THD even under nonlinear loading conditions.