Solid State Drives (EE2352) Scanned Lecture Notes - All Units (Type and Scan Version)

[Srini]

   

Anna University , Chennai

Department of B.E-Electrical and Electronics Engg.

Sixth Semester

EE2352 Solid State Drives

Scanned Lecture Notes - All Units (Type and Scan Version)

(Regulation 2008)

Content :
UNIT I 

DRIVE CHARACTERISTICS
Classification of Electric Drive:
Generally classified into 3 categories:
I. Group drive
II. Individual Drive
III. Multimotor Drive
Advantages
disadvantages
Block Diagram of a simple electric drive
Power Modulator
Parts of Electric Drives
It can classified as
1. Controlled rectifier (AC to DC converters)
2. Inverters (DC to AC converters)
3. AC voltage controllers (AC to AC converters)
4. DC choppers (DC to DC converters)
5. Cyclo converters (Frequency conversion)
Electrical Source:
Sensing unit :
Control Units :
Classification of Electric Drive:
Main classification of electric drives are :
1. DC drives and
2. AC drives
Comparison between DC and AC drives:

Dynamics of Motor Load System :
Fundamental torque equation:
Classification of load torques :
1.Active Load torques
2.Passice Load torques
Characteristics of different types of load:
Torque proportional to speed:
Torque propositional to square of the speed :
Torque inversely propositional to speed:
Multiquadrant Operation
Operation of hoist in four quadrants
Steady state stability
inequality of equ (7).
Modes of operation of Electric drives
A Electric drives operates in B modes of operation.
1. Steady state
2. Acceleration including starting
3. Deceleration including stopping.
Deceleration including stopping:-
Basics of Regenerative Braking:

UNIT II CONVERTER / CHOPPER FED DC MOTOR DRIVE
DC Motors and their performance :
Armature Resistance control :
Armature Voltage Control :
Ward – Leonard control system:
Phase Controlled converter fed DC Drivers
Single Phase drives:-

THREE-PHASE CONVERTER FED DC Drivers
THREE PHASE FULLY CONTROLLED RECTIFIER 
CONTROL OF DC SEPARETLY EXCITED MOTOR
DC CHOPPER DRIVES
CHOPPER CONTROL OF SEPARATELY EXCITED DC MOTORS
Motoring control
Regenerative braking:
Dynamic braking
CHOPPER CONTROL OF SERIES MOTOR
Regenerative braking of DC series motor
Dynamic braking of DC series motor
CONTROL STRATEGIES
The various control strategies are
1. Time Ratio control method (TRC)
2. Current limit control method (CLC)
Current Limit Control:-


UNIT – III

DESIGN OF CONTROLLERS FOR DRIVES
Closed loop control of Electric drive.
BLOCK DIAGRAMOF A CLOSED LOOP CONTROL SYSTEM
CURRENT LIMIT CONTROL
CLOSED LOOP TORQUE CONTROL
CLOSED LOOP SPEED CO CLOSED LOOP SPEED CONTROL SCHEME FOR ARMATE VOLTAGE CONTROL & FIELD WEAKENING CONTROL:NTROL:-

TRANSFER FUNCTION OF SEPARATELY EXCITED DC MOTOR
Speed controller
Proportional (P) controller:-
Proportional – Integral (PI) controller.
Converter selection and characteristics.

UNIT – IV

SYNCHRONOUS MOTOR DRIVES
Separate Controlled mode (or) True Synchronous Mode:
SELF – CONTROLLED MODE:
SELF CONTROLLED SYN MOTOR DRIVE EMPLOYING LOAD COMMUTATED THYRISTOR INVERTER
Voltage source inverter (VSI) fed syn Motor :
1) Square wave Inverter     2) PWM Inverter
3) Chopper with square wave Inverter

VSI fed syn motor drive has
1. Reasonable low
2. Converter cost high
3. Muti motor operation is possible
4. Open loop control may pose slability problems at low speeds
5. PWM drive has better dynamic response than square wave drive
6. Find application as generate purpose drive for low and medium powers.
Motor Power factor control:
Current source Inverter (CSI) fed SYN MOTOR
Constant Marginal Angle control:-‘
Continuation of current source inverters forced commutation circuits:
Permanent Magnet Synchronous Motor Drive
Sinusoidal PMAC Motor Drives:

UNIT V

3φ INDUCTION MOTOR DRIVES
Slip power Recovery System:
Kramer System
Improved version of Kramer System:
Closed Loop control for static KRAMER system:
Scherbius System:
Dc link static Scherbius drive:
Cycloconverter static Scherbius drive:

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