ABSTRACT
This paper proposes to design PWM with chaotic carrier, is simulated and
implemented in terms of their performance in suppressing ripples, increasing
converter conversion efficiency and spectral performance in maximum power
point tracking (MPPT) circuits (DC-DC converter) of the solar PV system. The
nominal duty cycle of the main switch in the Cuk DC-DC converter is adjusted
to a value so that the input resistance of the converter is equal to the equivalent
output resistance of solar PV module at the MPP. The performance comparison
of proposed Chaotic PWM control method has been carried out with
conventional PWM based MPP tracking of solar PV system experimentally with
a 37-Wp solar PV module.
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TABLE OF CONTENTS
CHAPTER NO
1
TITLE
PAGE
NO
ABSTRACT
i
LIST OF CONTENT
ii
LIST OF FIGURE
iv
INTRODUCTION
1
CIRCUIT CONFIGURATION
4
2.1 SYSTEM DESCRIPTION
4
2.2 DYNAMIC INPUT CHARACTERISTICS OF
2
A CUK CONVERTER AT MPP
4
2.3 L1235-37WP SOLAR PV MODULE
5
2.4 GENERATION OF CHAOTIC CARRIER
AND CHAOTIC PWM IN MATLAB
/SIMULINK
6
3
SIMULATION RESULTS
8
4
STEADY STATE PERFORMANCE
10
MATLAB SOFTWARE
12
5.1 INTRODUCTION TO MATLAB
12
5.2 STARTING MATLAB
12
5
5.2.1Basic Syntax
5.3 BASIC ASSIGNMENT OF VARIABLES
6
12
14
5.3.1 Variable Types
14
5.3.2 Accessing Variables In Arrays
14
MATLAB SIMULINK
16
6.1 INTRODUCTION
16
6.2 MODELING, SIMULATION, AND
16
ANALYSIS WITH SIMULINK
ii
6.2.1 Tool For Modeling
17
6.2.2 Tool For Simulation
17
6.2.3 Tool For Analysis
18
6.3 INTERACTION WITH MATLAB
ENVIRONMENT
18
MODELLING
19
7.1 BASIC MODELLING WORK FLOW
19
7.2 DEFINE SYSTEM
19
7.3 DETERMINE MODELING GOALS
20
7.4 IDENTIFY SYSTEM COMPONENTS
20
7.5 DEFINE SYSTEM EQUATIONS
21
7.6 COLLECT PARAMETER DATA
21
BASIC SIMULATION WORKFLOW
22
8.1 PREPARE FOR SIMULATION
22
8.2 DETERMINE SIMULATION GOALS
22
8.3 COLLECT DATA
23
8.4 PREPARE MODEL
23
8.5 SET PARAMETERS
23
9
CONCLUSION
24
10
REFERENCES
25
7
8
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LIST OF FIGURES
FIGURE NO
1
TITLE
Conventional Cuk converter based MPP
tracking
2
PAGE NO
4
Non linear V-I characteristics of L1235-37Wp
solar module
5
3
L1235-37Wp solar panel under test
6
4
Generation of Chaotic PWM in MATLAB
6
5
Generation of Chaotic PWM using MATLAB
6
6
Generation of Chaotic carrier using MATLAB
7
7
Chaotic PWM Cuk DC−DC converter based
MPP tracking
8
8
Change in duty cycle for various irradiation
level
9
9
Change in power for various irradiation level
9
10
Variation in Duty cycle for the changes in
load resistance
10
11
Periodic carrier
10
12
Conventional PWM – Cuk converter- Output
voltage ripples
11
13
Conventional PWM
11
14
Chaotic PWM
11
15
Define System
19
16
Prepare Model
22
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