INTERLEAVED BOOST CONVERTER FOR PV APPLICATION
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Transcript of INTERLEAVED BOOST CONVERTER FOR PV APPLICATION
A TECHNICAL SEMINAR
ON
INTERLEAVED BOOST CONVERTER
FOR PV APPLICATION
Presented by:Bibhu Prasad Ganthia1407105060 (PED)
STRUCTURE OF PRESENTATION Motivation Overview Schematic block diagram PV System DC-DC Converter (Boost) MPPT(P&O) Results Conclusion Future Work
MOTIVATION NON-CONVENTIONAL SOURCE OF ENERGY Limited availability of conventional energy sources . Renewable source of energy. Effective in all weather condition. Eco friendly.
PV SYSTEM Increase Generation capacity. No emission of pollutants.
.
OVERVIEW Simulation of PV module. Development of MPPT algorithm(P & O Method) . Design and simulation of DC-DC converter(Boost
converter) Design of MPP tracker.
SCHEMATIC BLOCK DIAGRAM
PV ARRAYINTERLEAVED
BOOSTCONVERTER
MPPT
DC LOAD
PV SYSTEM Equivalent Circuit
SINGLE DIODE MODEL OF PV CELL
Where,Iph =PhotocurrentID =Diode current Ipv =PV cell currentVpv=PV cell voltageRs= series resistanceRP= resistance due to leakage current (parallel resistance)
EQUATIONS:= Iph-Is[exp(q(Vpv+IpvRs)/KTcA)-1]-(Vpv+IpvRs)/Rp
Iph=[Isc+Ki(Tc-TRef)]ß/1000
Is(t)=Is(Tc-TRef)3exp[qEg(1/Tref-1/Tc)/KA]
Where, Is=Reverse saturation current q= charge of electrone K=Boltzmann constant A= Ideality factorTc=Tref= ß= irradianceEg=band gap energy
CHARACTERISTICS OF PV MODULE (T=25oc , G=1000 w/m2)
I~V Curve P~V Curve
DC-DC CONVERTER(BOOST) Steps up the input voltage. Helps in removing nonlinearity. Helps in increasing system efficiency.
DC-DC Boost Converter
L Diode
Switch
MODES OF OPERATION Charging Mode: The switch is closed and the inductor is charged by the source through the switch. The charging current is exponential in nature but for simplicity is assumed to be linearly varying. The diode restricts the flow of current from the source to the load and the demand of the load is met by the discharging of the capacitor. Discharging Mode: The switch is open and the diode is forward biased . The inductor now discharges and together with the source charges the capacitor and meets the load demands.
MPPT The efficiency of solar energy is very low. Thus we need some
techniques to extract the maximum power from these arrays, to
ensure that power converter circuits operate at the maximum
power point of the solar array.
The basic principle of MPPT is to extract the maximum available
power from PV module by making them operate at most efficient
voltage(MPP).
The main objective of all these MPPT algorithms is to achieve
fast and accurate tracking performance and minimize oscillations
due to varying weather conditions.
METHODS OF MPPTA lot of MPPT algorithms have been developed by researchers all over the world. They are:
perturbation and observation method incremental conductance method Hill climbing method.
P&O method is the most frequently used algorithm to track the maximum power because of its simple structure and fewer required parameters.
FLOW CHART OF P&O METHOD
Start
Measure V(n) I(n)
Calculate Power P(n)
P(n)-P(n-1)=0
P(n)-P(n-1)>0
V(n)-V(n-1)<0 V(n)-V(n-1)>0
YESNO
YES
YES
NO
NONO YES
Return
SIMULATION RESULTS After MPPT Control:
CONCLUSION Interleaved boost converter has been
studied and the waveforms have been verified.
One close loop inverter will be designed for the grid synchronization.
REFERENCE WEI WEN YIM-SHU LEE, Senior Member, IEEE,MARTIN
HOI LAM CHOW, Member, IEEE ,DAVID KI-WAI CHENG,” Interleaved Boost Converter with Zero Diode Reverse-Recovery Loss”.
Wong, P. L., and Lee, F. C. (2000),”Interleaving to reduce reverse-recovery loss in power factor correction circuits.”
Jovanovi´c, M. M. (1997), “A technique for reducing rectifier reverse-recovery-related losses in high-voltage, high-power boost converters.”
In Proceedings of IEEE APEC’97 Annual Meeting, Vol. 2, Feb. 1997. Tseng, C. J., and Chen, C. L. (1998), “Passive lossless
snubber for dc/dc converters. In Proceedings of IEEE APEC’98 Annual Meeting, Vol. 2,Feb. 1998