Multi-Input Inverter for Grid-Connected Hybrid PV/Wind Power System
ABSTRACT The objective of this paper is to propose a novel multi-input inverter for the grid-connected hybrid photovoltaic (PV)/wind power system in order to simplify the power system and reduce the cost. The proposed multi-input inverter consists of a buck/buck-boost fused multi-input dc-dc converter and a full-bridge dc-ac inverter. The output power characteristics of the PV array and the wind turbine are introduced. The perturbation and observation method is used to accomplish the maximum power point tracking algorithm for input sources. The operational principle of the proposed multi-input inverter is explained. The control circuit is realized by using a digital signal processor and auxiliary analog circuits. For practical applications, functions of soft-start and circuit protection are implemented. Experimental results have shown the performance of the proposed multi-input inverter with desired features
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ABSTRACT: The Hybrid PV/Wind power system is the best renewable energy sources due to their complementary nature. In this paper explains the simulation and control of DC/DC converter for a prototype of 3kW PV and 3.2kW PMSG based wind energy conversion system. The perturbation and observation algorithm fused with the proposed converters is used for drawing maximum power from the input sources. So power from the two sources can be delivered either independently or simultaneously depending on their availability. The single phase sinusoidal pulse width modulation (SPWM) inverter which is based on PQ control strategy supplied total power to the grid and maintained DC link voltage constantly at 400V. The LCL filter at the output of the inverter kept THD of grid current within the standard limit, and we have found that power fluctuation has been completely reduced using battery bank.International Journal of Renewable Energy Technology 09/2014; 4.
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ABSTRACT: This paper describes the design of a nonlinear controller with power sharing control capabilities of a double input buckboost-buckboost converter. First, this converter is introduced, and its principles of operation and the equations describing the converter circuit are reviewed. Next, the nonlinear model of the buckboost-buckboost converter is found by averaging the state equations. Then, a Lyapunov-based nonlinear controller, which is adaptive against input voltage and load disturbances (to provide line regulation and load regulation) is proposed. Finally, several simulation and experimental results from a prototype buckboost-buckboost converter operating under the proposed controller are reported to verify the operation of the designed controller.IEEE Transactions on Power Electronics 05/2013; 28(5):2402-2414. DOI:10.1109/TPEL.2012.2211620 · 5.73 Impact Factor
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ABSTRACT: A smart grid will require, to greater or lesser degrees, advanced tools for planning and operation, broadly accepted communications platforms, smart sensors and controls, and real-time pricing. The smart grid has been described as something of an ecosystem with constantly communication, proactive, and virtually self-aware. The use of smart grid has a lot of economical and environmental advantages; however it has a downside of instability and unpredictability introduced by distributed generation (DG) from renewable energy into the public electric systems. Variable energies such as solar and wind power have a lack of stability and to avoid short-term fluctuations in power supplied to the grid, a local storage subsystem could be used to provide higher quality and stability in the fed energy. Energy storage systems (ESSs) would be a facilitator of smart grid deployment and a “small amount” of storage would have a “great impact” on the future power grid. The smart grid, with its various superior communications and control features, would make it possible to integrate the potential application of widely dispersed battery storage systems as well other ESSs. This work deals with a detailed updated review on available ESSs applications in future smart power grids. It also highlights latest projects carried out on different ESSs throughout all around the world.Smart Grid and Renewable Energy 02/2013; 4(1):122-132. DOI:10.4236/sgre.2013.41015