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Department of electrical and electronics engineeringGandhiji institute of science and technology Approved by AICTE,NEW DELHI,

Affiliated to JNTU KAKINADA , Gattu Bhimavaram ( p. o)-521178,VATSAVAI(M),

JAGGAYYAPET , Krishna District www.gistech.co.in

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PRESENTED BY:

SK.SHABEER(14JF5A0201)

HARIKESH CHAUHAN(13JF1A0209)

A.ASHOK(13JF1A0201)

SUMBUL SABA(13JF1A0228)

RAJESH KUMAR(13JF1A0225)

UNDER GUIDE BY:-U. NARESH M.Tech

asst professor

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HEAD OF THE DEPARTMENT:-M.SUNDAR RAO M.Tech

Associative professor

Contents.......3

Abstract.Different Types Of convertersBuck ConverterBoost ConverterBuck- Boost ConverterDifferent Types Of Controller( p, pi , pid And Fuzzy) Fuzzy ControllerAdvantages, Disadvantages And Application Of Our

ProjectsConclusionQueries

Abstract ......4

This paper proposes a bidirectional buck boost cascade inverter and presents its modelling and control methods

Here the inverter can be seen as the cascade of a buck converter and boost converter main inductor current is maintained by buck stage and out voltage controlled by boost stage

It provides bidirectional operational with bipolar outputs. It reduces the dead time effect and reduced output distortion

OPERATION OF BUCK STAGE Buck converter is a dc- dc power converter

it is a class of switched mode power supply(SMPS)

It containing two semiconductors (Diode & IGBT)

To reduce voltage ripple , filters made of capacitor & inductor

Buck converter provide much greater power efficiency

APPLICATIONS:-

It is used in many industrial application such as cars trolley buses battery operated vehicles and battery charging etc....

To provide smooth control on output high efficiency , fast response and regeneration.

To provide long and less maintenance due to absence of moving parts.

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Operation of boost stage:-

Output voltage always higher than input voltage Boost converter is dc-dc power converter

It is a class of switch mode power supply (SMPS)

When switch is “on” : diode is reverse biased output circuit is thus isolated inductor is charged.When switch is “off “: output stage received energy from the inductor as well as input.Filter capacitor is very large to ensure constant output voltage .In this diode and transistor is used as switching device .It is voltage control device and it required small amount of current Switching speed is very high.It operates in nano second.

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Circuit diagram:-7

What is a fuzzy controller 8

Fuzzy logic controller developed by Zadesh in 1965.

Fuzzy logic control is rule based technique.

The rules are “IF THEN” rules

Fuzzy logic control can be well suited to control a system

with uncertain, complex , inaccurate or non linear

dynamics..

In fuzzy logic controller we used membership functions

Why should we use fuzzy controller 9

Very robust

It can be easily modified.

Can used multiple inputs and outputs sources.

Very quick and cheaper to implement.

Much similar than its predecessors.

Types of controllers 10

P-controllers (proportional controllers)

I-controller (integral controller)

PI-controller(proportional+ integral controller )

PD- controller(proportional +derivative controller )

PID- controller (proportional + integral +derivative controller )

PID-controller:-11 A controller in which the output are control signal

is a sum of three signals one being proportional to error signal one being proportional to integral of the error signal and third being proportional to derivative of error signal is known as PID controller.

Advantages:-

o It improves the system performance in all aspects due to combined operation of three.

o “P” of PID controller increase the gain of system.o “I” of PID controllers decreases the steady state

error.o “D” of PID controller decreases the rate of change

of error.

Compare PID and fuzzy logic controllers12

Reduced output distortions.

High performance achieved

Which can be utilized to eliminate the systems non linearity.

Quick speed.

ADVANTAGES:-

GREATER POWER EFFICIENCY SIMPLE CIRCUITS

HEAT DISSIPATION IS LESS

LESS SEMI CONDUCTOR DIVICES ARE REQUIRED

DISADVANTAGES:-

IT DOES NOT STEP - UP THE OUTPUT CURRENT

IT IS COSTLY AVAILABLE IN THE MARKET

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OUTLINE DIAGRAM14

CONCLUSION:-

Which can be utilized to eliminate the system nonlinearity , and thus high

performance acheived

Consequently , a decoupled control strategy with feed forward compensation

technique is proposed .15

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