期刊名称：International Journal of Engineering and Computer Science
印刷版ISSN：2319-7242
出版年度：2013
卷号：2
期号：11
页码：3163-3168
出版社：IJECS
摘要：A Photovoltaic (PV) system’s power output is not constant and fluctuates depending on weather conditions. Fluctuating powercauses frequency deviations in the power utilities when PV power penetration is large.Using a battery is the common practice to smooth PVoutput power fluctuations. In this paper, we propose and simple fuzzy based control method for PV-diesel hybrid system to reduce frequencydeviations without smoothing PV output power fluctuations. By means of the proposed method, output power control of PV system consideringthe conditions of power utilities and maximizing energy capture are achieved.This paper presents a low cost high efficiency transformer isolatedmicro-inverter for single-phase grid connected photovoltaic (PV) system. The proposed micro inverter is composed of two stages, an isolated dcdcconverter stage and an inverter stage with a dc link. A high frequency transformer isolated high voltage gain boost half-bridge dc-dcconverter is used at the first stage to achieve maximum power point tracking (MPPT) and to step up the PV voltage to the high voltage dc-link.A pulse width modulated (PWM) full-bridge inverter with LCL filter is used at the second stage to output the synchronized sinusoid currentwith unity power factor to the grid. By utilizing the transformer leakage inductance, two primary side switches can achieve zero voltageswitching (ZVS). A 210 W prototype of the proposed micro-inverter has been built and tested. The efficiency of the proposed boost half-bridgedc-dc converter has been measured according to the PV curve, which is up to 98.2%. Experimental results are provided to demonstrate thevalidity and features of the proposed circuit
