MINISTRY OF EDUCATION & TRAINING - MINISTRY OF TRANSPORT
HO CHI MINH CITY UNIVERSITY OF TRANSPORT
NHU KHAI HOAN
RESEARCH AND DEVELOPMENT A SOLAR
POWER SYSTEM
Major: Automation and Control Engineering
Code: 9520216
Ph.D THESIS SUMMARY
TP. HO CHI MINH 2019
The Thesis was completed at Ho Chi Minh City University of Transport
Science instructor 1: Assoc.Prof. Dong Van Huong
Science instructor 2: PhD. Pham Cong Thanh
Reviewer 1:.......................................................................................................
Reviewer 2: ......................................................................................................
Reviewer 3: ......................................................................................................
1
CHAPTER 1
INTRODUCTION
1.1 Motivation
Solar energy is known as a s green and endless energy ource. In the
21st century, solar energy has become more and more one of the most
important sources for human [1, 110]. Compared to other energy sources such
as hydroelectricity, wind power, thermal power, nuclear power, solar energy
has some of the following characteristics: no environmental pollution, high
safety, and endless reserves. Mooreover, it can be distributed everywhere in
wide power ranges (from a few W to hundreds of MW). If 0.1% of solar
energy on the global area is converted into the electricity with an efficiency
of 5%, it is estimated that 5.6 × 1012 kWh can be achieved each year,
equivalenst to 40 times the current generation of electricity on over the world.
In order to enhance the efficient of exploitation and use of solar
energy, the Prime Minister issued Decision No.11/2017/ -TTg encourages
the development of solar power projects in Vietnam. This is a big opportunity
to push the development of this energy source.
Up to now, the research and development of solar power systems is a
very necessary. The solar energy system has been become increasingly
completed more and more. There are some main trends in research and
development of solar power systems, such as improving optical-electricity
efficiency, building large capacity systems, setting up parallel safety electric
network. In the future, solar energy will become a main source of energy that
supports for some gradually exhausting energy sources such as coal, oil and
gas and water.
1.2 Objectives and content of the research
The objective of the thesis is to design a solar power system with
optimal power in order to enhance the opening efficiency of this system. The
content of the research is given as follows:
- Overview of the solar power system.
- Building a model of solar power system including components in the
system such as PV cell, DC / DC converter, SVPWM inverters, measurement
and control system ...
- Research and develop new algorithm-solution to track Maximum
Power Point (MPPT- Maximum Power Point Tracking)
- Building simulation model on computers.
2
- Model design of solar control system with automatic control and
supervision, the system includes: DC voltage boosters, SVPWM inverters,
control boards, inverter-control modulation algorithms and monitor the
system ...
1.3 Subjects and research methods
The object of the study is a solar power system. There are some of
main steps: theoretical research on solar power systems, research algorithms
to solve power optimization problems. Next, new algorithms are developped
and finally a real grid system is designed.
Research methods: document research, modeling buiding, analysis
and evaluation.
1.4 Novel contribution
The improved INC algorithm is applied in MPPT control of PV system
to find MPP with faster converge speed, narrower fluctuates around
maximum power point. However, the proposed method can minimize the loss
of transmitted power due to fluctuations around the maximum power point.
Furthermore, differential particle swarm optimization (DPSO) and
perburb particle swarm optimization (PPSO) are applied in MPPT controller
to improve the performance of PV system. The MPPT controlling technique
based on DPSO and PPSO algorithms has been successfully tested on a
system model. Moreover, the obtained results are compared to those obtained
from MPPT controller using traditional algorithms, demonstrates the
superiority of the proposed methods as compared to the traditional
algorithms.
The experimental results of grid-connected solar power system shows
that the system runs stably. In addition, the system is also used for the
purpose of researching and developing of project of solar energy system.
1.5 Scientific and practical significance
- Scientific significance: The proposed algorithms are applied to the
MPPT controller of the solar system to improve the operationing efficient of
the PV system.
- Practical significance: Confirm the practical applicability of the
proposed algorithms for the MPPT controller of the PV system by using
software tools and experimental systems.
1.6 Contents
The layout of the dissertation consists of 6 chapters as follows:
Chapter 1: Introduction
Chapter 2: Overview of solar power system
3
Chapter 3: Research and development of the MPPT controller of the PV
system
Chapter 4: Results of new algorithms-based MPPT controller
Chapter 5: Designing and manufactering the experimental PV system
Chapter 6: Conclusions and Development Trends
CHAPTER 2
OVERVIEW OF SOLAR POWER SYSTEM
1.1 General overview of solar power system
PV system is a system using to collect and convert solar energy into
DC or AC power according to requiring usage. There are many kinds of the
PV system to suitable to the practical requirements, usually classified into
three main types: grid-connected system, independent system, hybrid system.
2.1.1. Grid-connected solar power system.
The solar grid-connected system is a type of generation system
distributed in the grid power. There are many structures of solar energy
systems but two common ones can be listed as: single-level structure and
double-level structure.
Fig 2.1. Diagram of the single-level PV system
Fig 2.2. Diagram of the double-level PV system
SCR,
TRIAC
Hòa lưới
SVPWM
inverter
Lưới
điện
Controller
Microcontroller
Phụ tải
6 PWM
V, I
1 phase
3 phase
PV panel
ON/OFF
U,I. phase, frequency
SCR,
TRIAC
Hòa
lưới
DC/AC
SVPWM
inverter
Lưới điện
MPPT Controller, SVPWM
Microcontroller
Phụ tải
6 PWM
V, I
1 phase
3 phase
PV panel
ON/OFF
U,I. phase, frequency
DC/DC
Buck-boost
converter Filter
PWM
U,I. phase, frequency