This document analyzes a grid-connected photovoltaic (PV) system. It discusses modeling different components of the system like the PV module, DC-DC converter, maximum power point tracker, DC-AC inverter, and phase locked loop for grid synchronization in MATLAB/Simulink. Simulation results show the power flow and transformer loading. The overall model demonstrates utilizing surplus PV power fed to the grid and deficient power from the grid to meet load demand. Future work could involve more advanced components and control strategies.

1. ANALYSIS ON
GRID CONNEC TED PV
SYSTEM
Project Member:
Ishwor singh(BEL/070/219)
Khaga Raj subedi (BEL/070/221)
Kishor ghimire(BEL/070/222)
Ramesh adhikari(BEL/070/233)
Project Supervisor:
Shahabuddin Khan
Date: Sept 17,2017

2. CONTENTS
Introduction
Problem of Statement
Objectives
Methodology
Simulation Results
Future Works
Conclusion
References

3. INTRODUCTION
• Solar PV systems are generally classified into Grid-
connected and Stand-alone systems.
• In grid-connected PV systems Power conditioning
unit (PCU) converts the DC power produced by the
PV array into AC power as per the voltage and
power quality requirements of the utility grid.
Fig: block diagram of grid-connected solar PV system

4. STATEMENT OF PROBLEM
• In isolated system, power from the PV is not
sufficient to supply load during bad weather
condition
• The excess power generated by isolated PV
system is loss during summer days

5. OBJECTIVE
• The main objective of the project is to
utilize the deficient power required for
solar energy system through grid and to
fed surplus power of the solar energy
system to the grid

6. OUR PROJECT INVOLVE
Modelling of MPPT and PV controller
Modelling of Bidirectional DC-AC inverter
Modelling of Bidirectional DC-DC converter
Modelling of DC-DC converter
Modelling of PV module

7. MODELLING OF PV MODULE
PV Module is designed in Matlab/Simulink
based on these Equation:

8. IV CURVE FROM SIMULINK
AT VARIOUS IRRADIANCE

9. PV CURVE FROM SIMULINK
AT VARIOUS IRRADIANCE

10. MODELING OF DC - DC CONVERTER
• Boost converter is used to step-up a source
voltage to a higher level
The duty cycle is given by:
𝑉𝑜 /𝑉𝑖𝑛 = 1/ 1−𝐷

11. PERTURB & OBSERVE METHOD
MODELLING OF MPP TRACKER

12. MODELING OF DC - AC INVERTER
• DC-AC Single Phase full bridge inverter
• Generate SPWM pulses

13. PHASE LOCKED LOOP (PLL)
PD synchronizes the VCO output to the measured
grid voltage, while a LPF helps reduce harmonics

14. SIMULINK MODEL
• PV, grid power and battery are connected to
a home as complementary power sources for
a given house
• Battery is operated to prevent loss of power
during grid failure
PV GII
BATTERY HOME
GRID

15. OVERALL MODEL

16. • Load & Source Switching
SIMULATION RESULT

17. POWER FLOW

18. TRANSFORMER LOADING

19. HARDWARE IMPLEMENTATION

20. POW ER STAGES

21. CONCLUSION
• In this project single phase grid connected PV
System has been analyzed
• A practical case developed in MATLAB simulation
has been presented
• PLL is used for grid synchronization algorithm
• Overall model of PV system has been Presented

22. FURTHER WORK
• Centralized inverter topology can be replaced
by multistring or modular topology
• Net metering system can be incorporated
• A circuitry to disconnect PV system and GFCI
can be incorporated
• Advanced MPPT controller like INCC can be
used

23. REFERENCES
• S. Sumathi et al., “Solar PV and Wind Energy Conversion Systems”,
Springer International Publishing, Switzerland
• W.Hart Daniel, power electronics, Mc Graw Hill, New York, 2011
• H.Rashid Muhammad, power electronics, pearson publication
• www.ijareeie.com
• www.google.com
• www.Wikipedia.org
• www.mathworks.com
• www.ironridge.com