ABSTRACT ‘energy’ is now the fourth factor of

ABSTRACT

 

This
project introduces a high-gain single-stage boosting inverter (SSBI) for
alternative energy generation. As compared to the traditional two-stage
approach, the SSBI has a simpler topology and a lower component count. One
cycle control was employed to generate ac voltage output. This project presents
theoretical analysis, simulation and experimental results obtained from a 200 W
prototype. The experimental results reveal that the proposed SSBI can achieve
high dc input voltage boosting, good dc–ac power decoupling, good quality of ac
output waveform, and good conversion efficiency.

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A single-phase grid connected
transformerless photovoltaic (PV) inverter for residential application is
presented. The inverter is derived from a boost cascaded with buck converter
along with a line frequency unfolding circuit. Due to its novel operating
modes, high efficiency can be achieved because there is only one switch
operating at high frequency at a time, and the converter allows the use of
power MOSFET and ultra-fast reverse recovery diode. This dissertation begins
with theoretical analysis and modeling of this boost-buck converter based
inverter. And the model indicates small boost inductance will leads to increase
the resonant pole frequency and decrease the peak of Q, which help the
system be controlled easier and more stable. Thus, interleaved multiple phases
structure is proposed to have small equivalent inductance, meanwhile the ripple
can be decreased, and the inductor size can be reduced as well. A two-phase
interleaved inverter is then designed accordingly.

 

Index Terms—Micro
inverter, one cycle control (OCC), tapped inductor (TI)

 

 

 

 

 

 

 

 

 

 

 

1.     INTRODUCTION

 

Energy
is the basis of human life. The past few decades, energy is the backbone of
technology and economic development. In addition to men, machines and money,
‘energy’ is now the fourth factor of production. Without energy, no machine
will run, electricity is needed for everything. Hence, our energy requirements
have increased in the years following the industrial revolution. With the
worsening of the world’s energy shortage and environmental pollution problems, protecting
the energy and the environment becomes the major problems for human beings.
Thus the development and application of clean renewable energy, such as solar, wind,
fuel cell, tides and geothermal heat etc., are getting more and more attention.
Among them, solar power will be dominant because of its availability and
reliability. As predicted by, the solar will provide the electricity up to 64%
of the total energy by the end of this century as shown in Figure 1.1. Photovoltaic
(PV) power generation has become one of the main ways to use solar energy. And
the renewable energy source based distributed generation (DG) system are
normally interfaced to the grid through power electronic converters or
inverters. Thus developing a photovoltaic grid-connected inverter system is important
for the mitigation of energy and environmental issues.

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