MPPT based solar PV system for three phase grid connected IGBT based Inverter system using...

7/28/2019 MPPT based solar PV system for three phase grid connected IGBT based Inverter system using POWER-GUI environment

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Presented ByMr. STHITA PRAJNA RATHKRUPAJAL ENGINEERING COLLEGE

DEPARTMENT OF ELECTRICAL ENGINEERING

PESA-2013


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INTRODUCTION MOTIVATION

OBJECTIVE

BACKGROUND

MODELING OF PV ARRAY MPPT ALGORITHIM

PHASE LOCKEDLOOP

PWM GENERATOR

GRID CONNECTED PV SYSTEM SIMULATION RESULT

CONCLUSION

REFERENCE

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Due to the exponential growth of power demand now a

days distributed Power Generation Systems (DPGS)

based on renewable energies are not anymore regarded

as one of the engineering challenges today .

The major challenge in this area is synchronization of the

DPGS to the utility grid because of the stochastic behavior

of the input power from the non conventional energy

resources .

Our research mainly includes the source & grid sidecontroller i:e; MPPT controller & PLL technique which help

for grid synchronization for a hybrid energy system .

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Till now 400 million Indians have no access toelectricity and between 2009 and 2019 we areforecasting an increase in Indian electricitygeneration of 70.0%, which is among the highest for

the Asia Pacific region. To meet such huge demand DGPS is one solution but

the grid synchronization of DGPS is a majortechnical challenge, generally PLL technique with

PWM-VSI is used to interface the DG to the utilitygrid hence the gridside inverter control strategy isa major issues for ensuring grid stability in alladverse situation

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The over all objectives to be achieved in thisstudy are:

PV Array Model design using MATLAB/SIMULINK

MPPT algorithm implemented using SIMULINK

Combine the above results to track the MPP of PVarray using buck converter.

Replace dc link voltage and connect solar pvsystem with grid connected PWM inverter using PLLtechnique

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Fig 1 . DISTRIBUTED GENERATION1/19


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The single-diode model of the theoretical photovoltaic cell andequivalent circuit of a practical photovoltaic device including theseries and parallel resistances.

sR I

VpRpvI dI

practical PV device

ideal PV cell

0, exp 1, cellc

Id

qVI I Ipv cell akT

FIG 2. Single diode model of pvarray

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exp 1q V IR V IRs sI I N I Npv p s p N akT Rs c sh

,

,exp 1/

sc n I Ts

oc n V T t

I KIV K aV

[ ( )], I

n

GI I K T T

pv pv n c n G

T =Tc Tn

The equivalent circuit for the solar module arranged in NP parallel andNS series is shown

Ns R

sNp

I

VNs R

pNp

N Ip ph

SN

pN

exp 1

IR N VV s pq IRsN N Np S sI I N I N

ph p s p akT Rc sh

The terminal equation for the currentand voltage of the array becomes asfollows:

fig 3.General Equivalentcircuit models of generalized

PV Array


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FIG 4. MPPT algorithm based on P & O technique

0 5 10 15 20 250

50

100

150

200

P-V CHARECTERSTICS OF SOLAR PV

VOLTAGE

POWER


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Consequentl

y, a phase locked loopcan track aninputfrequency, or

it can generatea frequencythat is multipleof inputfrequency.

Whenever reference signal are in phase i:e, error signal arezero then we will sure that both PV source and load voltage areproduced same voltage and they are synchronized each other


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GRID SIDE CONTROL DIAGRAM


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The three-phase grid connected invertershown in this is composed of a dc voltagesource (Vdc), six switches, and utility grid(Vgrid). In inverter-based DG, the produced

voltage from inverter must be higher than theVgrid. It is required to assure power flow togrid. Since Vgrid is uncontrollable, the onlyway of controlling the operation of thesystem is by controlling the current that isfollowing into the grid.


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Phase sequence of SPV system with conventional grid should bematched . for this 3- should be 1200 phase apart from each other forboth the systemFrequency of SPV system should same as grid. Generally grid is of50Hz frequency capacityOne of the vital point is voltage matching . voltage level of both thesystem should be same, otherwise synchronizing not possible


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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

500

1000

1500

TIME

POWER

OUTPUT POWER THRUOGH MPPT CONTROLER

0 1 2 3 4 5 6

x 10

-5

-50

-40

-30

-20

-10

0

10

20

TIME

OUTPUT OF PLL

Current & voltage generatedfrom inverter


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0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 1

-400

-200

0

200

400

TIME

VOLTAGE

LOAD VOLTAGE

0.7 0.75 0.8 0.85 0.9 0.95 1-40

-20

0

20

40

LOAD CURRENT

TIME

CURRENT

Load Voltage & Current waveform

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

100

200

300

400

500

OUTPUT VOLTAGE SOLAR PV THROUGH MPPT CONTROLER

TIME

VOLTAGE

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-100

-50

0

50

100

TIME

CURRENT


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From the study we observe that in the PLLtechnique reference signal are in phase, sothat the error signal are zero, so here we getconclusion that the both source are in phasewith each other i:e, both load voltage andsolar PV produced same voltage of 400V. Byusing the MPPT controller we get the outputpower of solar PV system is 1420W.


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1. honghai kuang,shengqing li,zhengqiu Wu,Discussion on advantages &

disadvantages of DG connected to grid.IEEE,pp.170-173,2011

2. R. Messenger and J. Ventre, Photovoltaic Systems Engineering, CRC Press,2000, pp.41-51

3. Satyaranjan Jena Member, IEEE, and B.Chitti Babu, Member IEEE, Amiya KumarNaik, Gokulananda Mishra. Performance Improvement of Single-Phase GridConnected PWM Inverter Using PI with Hysteresis Current Controller 978-14673-0136-7/11/$26.00 2011 IEEE

4. Roland E. Best, Phase-locked loops: Theory, Design and Application,McGraw-Hill, New York, 2nd edition, 1993, pp. 93 . 104

5. Rahman, M.A.; Radwan, T.S.; Osheiba, A.M.; Lashine, A.E.; Analysis ofCurrent Controllers for Voltage-Source Inverter IEEE Trans. OnIndustrialElectronics, Volume: 44 , no. 4 , Pp. 477 485, ,1997

6. Heinz Willi van der Broeck and Hans-Christoph Skudelny, Analysis andRealization of a Pulse With Modulator Based on Voltage Space Vectors, in IEEETransactions on Industry Applications, 1988, pp. 142 . 150

7. N. Goshima, T. Kaito, M. Kawasaki, H. Koizumi, K. Kurokawa. T. Mizuno, K.Nagasaka and Y. Noda, A Novel Microcontroller for Grid-ConnectedPhotovoltaic Systems, in IEEE Transactions on Industrial Electronics, 2006,pp.1889 . 1897


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