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