1. Ph.D Theses

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/1/11

Browse

Subject: search.filters.subject.Maximum Power Point Tracking

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Design of Adaptive Robust Controllers for Renewable Energy Sources Integrated Smart Grid System
    (National Institute of Technology Karnataka, Surathkal, 2020) G, Hemachandra.; Sharma, K Manjunatha.
    Energy supply and consumption from conventional fossil fuel is seen as a factor to global warming and deterioration of the environment. It is essential to use clean, non-polluting and alternative energy sources. Wind energy conversion technologies have proved attractive and competitive in terms of conventional fossil energy technologies with increased demand for electricity. It may reduce the negative impacts of traditional energy sources on the environment and reducing dependency on fossil fuels. Because of its high efficiency, the wind energy system can be an alternative source of energy for the future. The most frequently used variable-speed wind turbine is to enhance energy capture at distinct wind speeds. Self-excitation, elevated efficiency, power density, a wide variety of velocity, certainty and full isolation of the PMSG from the power grid have rendered it preferable for various wind systems. In addition to the wind power system, photovoltaic (PV) system developments are heightened the need for injecting the PV power in to the grid. PV array is composed of series and parallel PV cell combinations to maintain the required current and voltage levels operate in centralized grid connected inverter. However, substantial power losses have been reported due to the imbalanced generation between PV panels, which is mainly due to partial shading. Fuel cell (FC) act as continuous power source to mitigate the intermittent nature of PV and wind system. FC’s are clean and high efficient independent power generating source with zero emissions. Investigation of the performance of robust and non-linear controllers under varying wind speed scenarios is explored as a preliminary study. It is discovered that automated robust controller design is essential for the renewable power systems applications. Proposed research work intends to address the maximum power tracking issue for the autonomous wind power system and grid connected PMSG based wind energy conversion system, sub-module level PV system, and fuel cell. Genetic algorithm is used to design a new robust Quantitative Feedback Theory (QFT) controller based on automatic loop shaping methodology. The outcome of research work iiiis to extract the maximum power from hybrid renewable energy sources with automated robust QFT control strategy.
  • Thumbnail Image
    Item
    Solar Photo Voltaic Water Pumping System
    (National Institute of Technology Karnataka, Surathkal, 2014) Kappali, Mrityunjaya; R. Y, Udaykumar
    Water pumping is an important application of solar photo voltaic (PV) power. However growth in the number of solar pumps is not promising mainly due to higher cost per litre of water pumped and complex technology. These issues can be addressed by harnessing more power per unit installed capacity of solar panel and making the system simple. Present research work has dealt with the aspect of harnessing more power from PV panel using maximum power point tracking (MPPT) for a standalone water pumping system. Literature review indicates the need for MPPT method which is simple, accurate as well as non-interruptive in nature. This thesis has proposed a novel method for accomplishing MPPT wherein only load voltage is to be used as control parameter for MPPT converter (MPPTlv). This method is simpler than the present more commonly employed method of monitoring panel power (MPPTpp) which requires measurement of two parameters (panel voltage & current) and then multiplying them to obtain power. The proposal is substantiated by theoretical explanation and results from simulation & experimental testing. In addition to its simplicity, the new proposal is also found to give higher power output and enhance water yield. An algorithm is developed to show simulation implementation of the proposal made. Another outcome of the present research work is the development of a new strategy “Individual Floor Storage Method (IFSM)” for solar pumping in multi-floored buildings where over head (OH) tanks act as storage elements. Present practice is “Top Floor Storage Method (TFSM)" wherein one single large OH tank is placed on topmost floor. IFSM proposes to employ small tanks at each floor height supplying water to corresponding floor. Water is pumped to the required optimum heights only, avoiding wastage of energy. For a particular power capacity of solar panel, the amount of water lifted will be more. Effective total cost per litre of water lifted is appreciably reduced. In other words, for a particular amount of water to be lifted per day, the PV panel size needs to be less. The two new proposals made in this research work, giving increased water yield from the solar pump for a particular capacity of solar panel, are expected increase the acceptability of solar water pumps and thus contribute to their growth.