1 Department of electrical and electronics engineering Gandhiji 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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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
.
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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