DESIGN OF DC CONVERTER WITH PHOTOVOLTAIC ARRAY

PREPARED BY :

*MUSTAFA KULLAB

*MOHAMEAD YAMMAN FATTAL

*MOHAMEAD WELID ALQATY

Supervisor :

Dr WKaa Farman Ahmed

INTRODUCTION :

Photovoltaic cells, commonly known as solar cells, are semiconductor devices that convert sunlight directly into electricity.

Efficiency range from a few percent to above 40%.

Low maintenance, long lasting sources of energy

Provides cost-effective power supplies for people remote from the main electricity grid.

Non-polluting and silent sources of electricity. Renewable and sustainable power, as a

means to reduce global warming.

Figure 1 : block diagram of PV system with DC/DC converter

PHOTOVOLTAIC CELLS

The four general types of silicon photovoltaic cells are:

1. Single-crystal silicon. 2. Polycrystalline silicon.3. Ribbon silicon. 4. Amorphous silicon.

Hybrid connection of photovoltaic module

(Series and Parallel)

Figure 2: Modules in a Parallel-Series Array with Bypass Diodes and Isolation Diodes

Figure3 : current –voltage carve

MAXIMUMM POWER POINT

o with constant temperature and irradiation

MAXIMUMM POWER POINT

o with constant temperature and varying irradiation

Figure4 : current –voltage carve

MAXIMUMM POWER POINT

o with constant irradiation and varying temperature

Figure5 : current –voltage carve

MAXIMUMM POWER POINT

DC/DC CONVERTER - DC CHOPPERSTOPOLOGIES

1. Buck Converter

2.Boost Converter

Figure 6 : Buck Converter circuit

Figure 7 : Boost Converter circuit

Vo=DVs

DC/DC CONVERTER - DC CHOPPERSTOPOLOGIES

3.Buck/Boost Converter

Figure 8 :Buck/Boost Converter

Thank you