Multi-Input Inverter for Grid-Connected Hybrid PV/Wind Power System

Elegant Power Application Res. Center, Nat. Chung Cheng Univ., Chia-Yi
IEEE Transactions on Power Electronics (Impact Factor: 6.01). 06/2007; 22(3):1070 - 1077. DOI: 10.1109/TPEL.2007.897117
Source: IEEE Xplore


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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    • "A hybrid AC/DC micro-grid concept is introduced in [7] [8] to avoid multiple reverse conversions in an individual AC or DC grid and to facilitate the connection of various renewable AC and DC sources and loads. A novel single phase multiinput inverter for the grid-connected hybrid photovoltaic/wind power system in order to simplify the power system and reduce the cost is reported in [9]. In order to efficiently and economically utilize renewable energy resources of wind and PV applications, some form of backup systems are almost universally required. "
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    ABSTRACT: This paper focuses on modeling, control and performance study of a DC microgrid considering both DC and AC loads. The control schemes among various converters have been proposed for the DC microgrid to achieve two desired goals: to extract maximum power from each power source and to regulate DC bus voltage at the input of the inverter. The main objective of this study is to design and control a microgrid that guarantees the continuity of power supply. The developed microgrid system can operate in a grid connected or autonomous mode under various generation and load conditions. Simulation results are presented using MATLAB, Simulink and SimPowerSystems environments based on the mathematical and dynamic electrical models developed for the microgrid system. Different resource conditions and load capacities are considered in this study to validate the control methods. The simulation results show that the coordinated control schemes can maintain stable operation of the DC microgrid in both grid connected and isolated mode.
    Full-text · Article · Nov 2014
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    • "Different hybrid Wind/PV generation system is proposed and discussed in works [1]-[4], these systems use MPPT based DC/DC converters to achieve maximum power from both the energy sources [1]-[3]. A dual input inverter is recommended by [1], where a multi input buck/buck boost converter is used and MPPT is accomplished for both wind and PV system. A grid tied wind energy conversion/PV/Fuel cell hybrid system is proposed by [2], this system can lead to maximum output energy and minimum output power fluctuation for stand alone mode. "
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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.
    Full-text · Article · Sep 2014 · International Journal of Renewable Energy Technology
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    • "shows the proposed integrated three-port dc–dc converter topology. A three-phase DAB converter is applied to realize the bidirectional power flow function and the Y-Y connected high-frequency transformers can provide galvanic isolation and voltage-level matching between low voltage energy sources and high-voltage dc bus [5]. The leakage inductances Ls1 − Ls3 of the transformer are used as energy storage elements to transfer the power between two sides, and the power flow is mainly controlled by a phase-shift angle ϕ. "

    Full-text · Conference Paper · Mar 2014
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