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A.Arunchand10G01D5401

K.Sudharshan.,M.Tech.,Asst professor, Dept of EEE.

Department of Electrical and Electronics Engineering

sri venkatesa perumal college of engineering & technology an iso 9001:2000 certified

institute(affiliated to j.n.t.u, anantapur, approved by aicte, new delhi) rvs nagar, puttur 517 583.

2010-2011

Investigating the Performance of a Fuel Cell Based

Distributed Generation System

12/12/2012EEE DEPT , SVPCET

1

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Objective

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Design the fuel cell based distributed generation system

It objective being to regulate the input fuel flow in order

to meet a desirable output power demand

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Introduction

12/12/2012EEE DEPT , SVPCET3

Present existing system has disadvantages

In this technique source is fuel cell

This technique can over come these problems

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Basic proposed model of FCDG system

12/12/2012EEE DEPT , SVPCET4

Fig 1. block diagram of modeling and control of a grid connected pem fuel cell

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FUEL CELL

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Fuel Cells are electrochemical devices that convertthe chemical energy of reaction directly into

electrical energy

The fuel cell operates with a low voltage in a widevoltage range (25V-45V)the is voltage must be

transformed to around 350-400V in order to invertthis dc power into ac power to the grid

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Types of fuel cell

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proton exchange membrane (pem):

molten carbonate

solid oxide

alkaline

phosphoric acid

direct methanol (a subset of pem)

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Basic PEM fuel cell

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Anode:

2H2 => 4H+ + 4e-

Cathode:O2 + 4H+ + 4e- => 2H2O

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pem fuel cell modeling

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Make some assumptions

One-dimensional treatment

Ideal and uniformly distributed gases

Constant pressures in the fuel-cell gas flowchannels

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Mathematical equation representation in pem FC

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pem fuel cell output equation

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without loses

with loses

N

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Block diagram of FCDG system

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Fig 2. fuel cell distributed generating system

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DC-DC boost converter

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Fig 3. DC-DC boost converter

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Operation of boost converter

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Fig 4. Switch is in ONState Fig 4. Switch is in OFF State

The output voltage Vo is directly proportional to the

duty cycle D at the same input voltage

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PWM for boost converter

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Fig 5. Control Circuit Waveforms for PWM

The output voltage can becontrolled

The control signal iscompared with a saw toothsignal such that if thecontrol signal is higher than

the saw tooth waveform

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DC/DC converter control Circuit

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Fig 6. Block diagram of a DC/DC converter control Circuit

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The three-phase voltage source inverter

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Fig 7. the main circuit of the three-phase voltage source inverter

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PWM Techniques

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Sinusoidal PWM

Third-harmonic PWM

60 PWM

Space vector modulation

Fig 8. The triangular voltage waveform and three sinusoidal control voltages

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DC/AC inverter control Circuit

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Fig 9. DC/AC inverter control Circuit

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LC filter circuit

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The inverter output contains a large amount of

harmonics and to reduce these harmonics

Both L and C and the input dc voltage should bechosen so that the following equation is satisfied

between the dc side and ac side voltages of the

inverter

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Conclusion

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This paper has presented an overall evaluation of a

100 KW FCDG system

All 3-phase voltages are simulated and verified to becontrollable at 1.0 p.u. under balanced or

unbalanced loads

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12/12/2012EEE DEPT , SVPCET22

Zhe, Joseph M. Guerrero and Fred Blaabjerg (2009 ),Fuel cell based generating

system , IEEE Trans. on Power Electronics, Vol. 24, No.8, pp.1859-1875.

Willkie J., Leithead W.E. and Anderson C. (1990),PWM technique for DC-DC

BOOST CONVERTER, Vol. 13, No. 4,pp. 134-142.

Muller.S, Deicke.M and De Doncker.R.W (2001), pwm technique for dc-ac

inverter, IEEE Trans.on Industry Applications Magizine, vol.8, No.3, pp.26-33

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12/12/2012EEE DEPT , SVPCET23

Thank you..