DESIGN AND ANALYSIS OF A THREE PHASE BUCK BOOST AC-DC CONVERTER

modelling AND ANALYSIS OF A THREE PHASE BUCK BOOST AC-DC CONVERTERPRESENTED BY:

p.nava kumar 12k65a0210 UNDER THEGUIDANCE OFMR.G.SATYANARAYANA M.E ContentsAbstractIntroductionApplicationsBasic operation of buck-boost converterProposed converterConverter operationSimulation circuitSimulation resultsConclusionPEOs and POsPlan of action

The converter can operate with input power factor correctionIt is suitable for applications where a converter needs to operate over a wide range of input ac voltagesIt produce a wide range of output dc voltages

AbstractAc-Dc two stage power conversion

Introduction4The dramatic growth in the use of electrical equipment in recent years has resulted in a greater need to limit these harmonics to meet regulatory standards.This can be done by some form of power factor correction (PFC) to shape the inputA Buck-Boost converter is a type of switched mode power supply that combines the principles of theBuck converterand theBoost converterin a single circuit. 5Applications:-Used as charging circuit for hybrid vehicle used for dc transmission lines

It can be used in applications that require a converter that can operate over a wide of conditions

BUCK-BOOST CONVERTERIt is a combination of two basic convertersBuck converterBoost converterThe main application of buck-boost converter is in regulated dc supplyThe output input voltage convertion ratioV0 /Vd =D(1/1-D)

BUCK BOOST CONVERTER

Fig : current and voltage waveforms of buckboost converter When the switch is turned on, the input voltage source supplies current to the inductor.

Basic operation of buck-boost converter

When the switch is opened, the inductor supplies current to the load via the diode D

Fig:-A Novel Three-Phase BuckBoost ACDC ConverterDunisha S. Wijeratne, Student Member, IEEE, and Gerry Moschopoulos, Senior Member, IEEEA Three-Phase BuckBoost ACDC ConverterBuck converter mode of operation

Fig. . Modes of the converter when D < 0.5. (a) Mode 1 (t0 < t < t1 ). (b) Mode 2 (t1 < t < t2 ). (c) Mode 3 (t2 < t < t3 ). (d) Mode 4 (t3 < t < t4 ).e) Mode 5 (t4 < t < t5 ). (f) Mode 6 (t5 < t < t6 ).

Boost converter mode of operation

Fig. Modes of the converter when D > 0.5. (a) Mode 1 (t0 < t < t1 ). (b) Mode 2 (t1 < t < t2 ). (c) Mode 3 (t2 < t < t3 ). (d) Mode 4 (t3 < t < t4 ).(e) Mode 5 (t4 < t < t5 ). (f) Mode 6 (t5 < t < t6 ). (g) Mode 7 (t6 < t < t7 ).

Simulation circuit

Simulation output for D>0.5

Simulation output for D