International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Closed Loop Operation of Step-up Resonant Converter Dinto Mathew1, Susmitha K Babu2, Dawtie Grace Joseph3 ,Athulya M.S4 1Asst.Professor,
Dept. of Electrical and Electronics Engineering, Mar Athanasius College of Engineering, Kothamangalam, Kerala 2,3,4 Students, Dept. of Electrical and Electronics Engineering, Mar Athanasius College of Engineering, Kothamangalam, Kerala ---------------------------------------------------------------------***--------------------------------------------------------------------utilized with the form of AC power. The generation Abstract - The increased use of the fossil fuels such as the equipments of the renewable energy sources and oil, the coal and the gas, result in serious greenhouse effect and pollute the atmosphere, which has great effect on the energy storage devices usually contain DC conversion world. Meanwhile, there is a big contradiction between the stages and the produced electrical energy is delivered fossil fuels supply and the global energy demand, which leads to the power grid through DC/AC stages, resulting in to a high oil price in the international market recently. The additional energy loss. Moreover, the common problem energy shortage and the atmosphere pollution have been the of the renewable energy sources, such as wind and major limitations for the human development. Photovoltaic solar, is the large variations of output power, and the (PV) sources are one of the significant players in the worlds connection of large scale of the renewable sources to energy portfolio and will become the biggest contributions to the power grid is a huge challenge for the traditional the electricity generation among all renewable energy electrical equipment, grid structure and operation. candidates. Because it is truly a clean, emission free renewable Among the many photovoltaic system seems to be electrical generation technology with high reliability. A resonant dc-dc converter topology is used for the first stage of attractive due to its inherent characteristics such as a two-stage converter to link a renewable energy source to a abundance in availability, cost free safe resource and utility grid. For reliable input to a grid the inverter needs a its ecofriendly nature. The only disadvantage of the PV stiff input dc voltage. To minimize switching loss and avoid system is that the output voltage being very low. But to switching over voltages a resonant converter is used. To gain meet the required output according to bus voltage the necessary dc voltage at the inverter input, it is necessary specifications the role of power electronics comes into to use a dc/dc step-up converter. Connected to the output of play. DC grid is another solution to the aforementioned the converter is a series combination of the inductor and a issues such as the energy losses during the conversion capacitor such that the capacitor resonates with the inductor stages and is an emerging and promising approach at the switching frequency. The output from resonant tank is which has been drawn much attention recently impact rectified and filtered for input to the inverter. Results from simulation tests confirm the current’s resonant pattern. Yet on conventional plant. further results are shown of the converter’s performance at different loadings to confirm the zero-current switching effects. It is concluded that this converter topology provides a reliable basis for the application under consideration. Key Words: Resonant converter, voltage step-up, renewable energy, soft switching, voltage stress
For the application where galvanic isolation is not mandatory, the use of a transformer would only increase the cost, volume and losses, especially for high-power high-voltage applications. Several nonisolated topologies for high-power high-voltage applications have recently been proposed and studied in the literature. A Boost converter is adapted by the researchers of Converteam company [1] to transmit energy from 50kV to 200kV. To obtain the higher voltage-gain, Enjeti et al[2] proposed a multiple-module structure, which consists of a Boost converter and a Buck/Boost converter connected in input parallel output-series. The output power and voltage are shared by the two converters and the voltage and current ratings of switches and diodes are correspondingly reduced. However, the efficiency of Boost or Buck/Boost converter is relatively low due to the hard switching of the active
1.INTRODUCTION Our planet is facing serious energy crisis due to the escalating energy demand which could not be satisfied with the supply available. Coal, petroleum and even hydroelectric power are inadequately available at present. Now it is high time that we take necessary precautions to handle this situation. Recently researches are being carried out on renewable energy systems. The development of renewable energy sources is crucial to relieve the pressures of exhaustion of the fossil fuel and environmental pollution. At present, most of the renewable energy sources are © 2017, IRJET
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