Multi-Input Inverter for Grid-Connected Hybrid PV/Wind Power System
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13-10-2010, 10:21 AM



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

Y.-M. Chen, S.-C Hung, (2.4.C heng, and Y.-CL.i u
Power Electronics Applied Research Laboratory
(PEARL)
Department of Electrical Engineering
National Chug Cheng University
Ming-Hsiung, Chia-Yi, Taiwan



ABSTRACT


The objective of this paper is to propose a novel multi-input inverter for the grid-connected hybrid PVlwind power system in order to simplify the power system and reduce the cost. The proposed multi-input inverter consists of a butmuck-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, I. INTRODUCTION Applications with photovoltaic (PV) energy and wind energy have been increased significantly due to the rapid growth of power electronics techniques [ 11121. Generally, PV power and wind power are complementary since sunny days are usually calm and strong winds are often occurred at cloudy days or at nighttime. Hence, the hybrid PV/wind power system therefore has higher reliability to deliver continuous power than either individual source [3 J. Traditionally, a substantial energy storage battery bank is used to deliver the reliable power and to draw the maximum power from PV arrays or wind turbines for either one of them has an intermittent nature [4]. However, the battery is not an environmental friendly product because of its heavy weights, bulky size, high costs, limited life cycles, and chemical pollution. Therefore, the best way to utilize the solar or wind energy is to connect them to the ac mains directly
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