Darshan Institute of Engineering and Technology Electrical Engineering Department Control of Electric Drives (2160913) Chapter : 1 - Introduction Sr No Introduction W-19 S-19 W-18 S-18 W-17 S-17 W-16 S-16 W-15 S-15 W-14 S-14 W-13 S-13 W-12 S-12 W-11 1 What do you mean by an electric drive? Draw and explain block diagram of an electrical drives. OR Draw the basic block diagram of Electric Drive and Explain the function of any three blocks 4 4 4 4 7 7 7 7 7 7 7 2 Write a brief note on the sources employed in electrical drives. 3 3 Compare A.C. & D.C. drives. 4 7 7 7 7 4 State the advantages of an electric drive system. 3 3 7 7 7 5 Write applications of electric drives. 6 Explain classification of electric drives and also explain factors affecting selection of drive. OR What is an Electric Drive? Give the classification of Electric Drive. 3 3 3 7 7 7 7 7 Explain state of art of AC and DC drives. 8 State and explain various functions of power electronics converters. OR What are the functions of power modulator? 3 7 7 Theory 11 9 4 7 4 7 7 7 17 28 14 14 14 17 0 0 21 Example 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Total Marks 11 9 4 7 4 7 7 7 17 28 14 14 14 17 0 0 21
Transcript
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 1 - Introduction
SrNo Introduction
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1
What do you mean by an electric drive? Draw and explain blockdiagram of an electrical drives.ORDraw the basic block diagram of Electric Drive and Explain thefunction of any three blocks
4 4 4 4 7 7 7 7 7 7 7
2 Write a brief note on the sources employed in electrical drives. 33 Compare A.C. & D.C. drives. 4 7 7 7 74 State the advantages of an electric drive system. 3 3 7 7 75 Write applications of electric drives.
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Explain classification of electric drives and also explain factorsaffecting selection of drive.ORWhat is an Electric Drive? Give the classification of Electric Drive.
3 3 3 7 7 7 7
7 Explain state of art of AC and DC drives.
8State and explain various functions of power electronics converters.ORWhat are the functions of power modulator?
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 2 - Dynamics of Electrical Drives
SrNo Dynamics of Electrical Drives
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Explain quadratal diagram of speed - torque characteristics.ORExplain the Multi quadrant operation of electrical drives withsuitable conventions and example.
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2 Explain steady state & transient stability of an electrical drive. 73 Explain conventional method of speed control of DC drive.4 With diagram explain dynamics of motor-load system.
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Explain the nature and classifications of load torque with theircharacteristics.ORWrite a note on load torque and its classification.
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6 Explain conventional variable speed electric drive system withdiagram. State the limitations of this method.
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Explain drive parameters 1) Load with rotational motion 2) Loadwith translation motion.ORExplain drive parameters for the load with rotational motion.
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Explain criteria for steady state stability.ORExplain the concept of steady state stability with proper example.Also derive the condition for steady state stability of a drive.ORWrite a note on stability of an electrical drive.
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9Derive the equation to determine moment of inertia.ORExplain the method to determine the moment of Inertia (J).
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Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 2 - Dynamics of Electrical Drives
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 3 -DC Drives
SrNo DC Drives
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Draw and explain T/Ia, N/Ia and N/T characteristics of DC seriesmotors. (where T is torque, Ia is armature current and N is speed).ORExplain characteristics of DC series motor and explain why seriesmotor is never started on NO-load condition.
3 1 7 7 7 7 3.5
2
Draw and explain T/Ia, N/Ia and N/T characteristics of DC shuntmotors. (where T is torque, Ia is armature current and N is speed).ORDraw and explain various characteristics of DC shunt motor.
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Explain various method of speed control of DC shunt motor.ORExplain armature control and field control of DC shunt motor.ORWar-Leonard system for DC motor speed control.ORDraw modified speed torque characteristics with resistive controlfor different DC motors.
3 7 7 7 7 7 14 7
4 Explain speed control methods of DC series motor. 3 75 Explain types of DC motor. 7
6
Explain the opeartion of dual converter circuit.ORDiscuss operation of dual converter in simultaneous and non-simultaneous controlling mode.ORDraw the of circuit 1-ɸ dual converter drive for the speed control ofseparately excited dc motor. Also draw the waveform.
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Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 3 -DC Drives
SrNo DC Drives
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7 Explain principles of speed control of DC motor with necessaryoperating modes. 7
8 Explain fullwave converter with two quadrant operation.9 Explain DC series motor drive with controlled rectifier. 7 7
10Explain chopper control of separately excited dc motor.ORExplain principal of chopper control for speed control of DC motor.
3 7
11 State the principle of DC motor speed control. Explain single phasesemiconverter DC motor drive. 7 7 7
12 Explain control strategies of chopper using Time Ratio Control(TRC) and Current Limit Control (CLC). 7 7 7 7
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Explain Dynamic model of DC drive.ORDerive basic modeling of DC motor with necessary assumptions.Draw block diagram from the derived functions.
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14 Explain closed loop control of DC motor drive.15 Explain closed loop current limit control of DC motor drive.16 Classify controlled converter fed DC motor drives. 317 Explain closed loop torque control of drives.
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Explain position control method in dc motor drive.ORDraw and explain block diagram of speed and position control of DCmotor using dynamic model.
7 7
19 Explain close loop control speed control of DC motor in brief. 4
20 With circuit diagram, explain motoring control of a DC motor whendriven by a chopper. Also, draw speed – torque characteristic. 4
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 3 -DC Drives
SrNo DC Drives
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Explain the opeartion of 1-phase fully controlled converter tooperate a separately excited DC motor in 1st and 4th quadrant.Derive the expression for speed- torque characteristic of the DCmotor and clearly mention how the characteristic will change withchange in firing angle.ORExplain separately excited dc motor drive with controlled rectifier.ORDerive an equation that shows the relation between Speed andTorque when Separately excited DC motor is driven by single phasefull controlled rectifier.ORDiscuss the speed torque characteristics of single phase fullycontrolled rectifier fed dc separately excited motor.
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22
Explain operation of chopper controlled separately excited dc motordrive.ORDiscuss chopper controlled Separately excited DC motor driveoperation for motoring mode.
7 4
23 Explain Electronic speed control method for DC motors.
24 Explain the regenerative braking when dc motor is driven bychopper.
25 What is dynamic braking? Prove that effective value of brakingresistor depends on duty ratio.
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 3 -DC Drives
SrNo DC Drives
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Derive an equation that shows the relation between Speed andTorque when Separately excited DC motor is driven by three phasefull controlled rectifier. Also draw the speed - torque characteristics.OR Draw the modified speed-torque characteristics of DC shunt motorwith phase controlled converters with proper labeling.
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Explain the motoring control and regenerative braking when dcmotor is driven by two quadrant chopper.ORExplain chopper controlled DC shunt motor drive operation formotoring mode and regenerative mode.
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28 Give dc 3points of comparison between converter fed dc drives andchopper fed drives. 3
29 Explain the 3-ɸ half wave converter drive for the speed control ofseparately excited dc motor with waveforms at α=30˚, α=150˚. 7
Examples
1
A 200V, 875 rpm 150A separately excited dc motor has an armatureresistance of 0.06 Ω. It is fed from a single phase fully controlledrectifier with an ac source voltage of 220 V, 50 Hz. Assumingcontinuous conduction, calculate firing angle for rated motor torqueand 750 rpm.
3 3
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 3 -DC Drives
SrNo DC Drives
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A 200V dc series motor has armature and field resistance of 0.2Ωand 0.1Ω respectively. It takes a current of 20A from the supplywhile running at 1300rpm. If an external resistance of 2Ω is addedin series with the motor calculate new armature current and thespeed. Assume load torque is remains constant.
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3
A 200V, 500 rpm 100A separately excited dc motor has an armatureresistance of 0.06 Ω. It is fed from a single phase fully controlledrectifier with an ac source voltage of 220V, 50Hz. Assumingcontinuous conduction, calculate (a) firing angle for rated motortorque and 250 rpm.(b) firing angle for rated motor torque and -250rpm (c) motor speed for α = 150° and rated torque.
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A 230V, 850 rpm 150A separately excited dc motor has an armatureresistance of 0.06 Ω. It is fed from a chopper with source voltage of230V. Assuming continuous conduction, calculate duty ratio forrated motor torque and 600 rpm.
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A 200V dc series motor runs at 800rpm when operating at its fullload current of 10A. the motor resistance is 0.5Ω and magneticcircuit can be assumed unsaturated, what will be the speed if (a) theload torque is increase by 50%(b) the motor current is 5A.
7
6
A 200V, 875 rpm 150A separately excited dc motor has an armatureresistance of 0.06 Ω. It is fed from a single phase fully controlledrectifier with an ac source voltage of 220 V, 50 Hz. Assumingcontinuous conduction, calculate motor speed for firing angle α =160° and rated torque.
3
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 3 -DC Drives
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 4 -Scalar control of AC Machines
SrNo Scalar control of AC Machines
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1 Draw and explain torque/speed curve of 3 - phase induction motor. 7 7 72 Explain rotor rheostat control of slip ring induction motor. 7 7
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List the methods of speed control of induction motor and explainany one in detail.ORList the methods of speed control of induction motor and explainany two in detail.
7 7
4 Explain speed control of induction motor by frequency control usinginverter. 7
5 Explain the method of speed control of three phase induction motorby 1) stator voltage control 2) frequecny control. 4 7
6 Draw the diagram of static rotor resistance control and explain it indetail. 3 7 7 7
7 Explain solid state speed control of AC drives using inverters. 7 7 7 7 78 Explain v/f control method of 3 phase induction motor. 7 7 7 7 79 Explain various operating modes for doubly fed induction machine. 7 7 4 4
10 State the advantages of v/f control over other scalar controltechniques. 4 3 3 3 3
11 Explain static scherbius drive with appropriate diagram. 7 7 712 Comparison between CSI fed IM control and VSI fed IM control. 3 4 4 713 Explain 'voltage boosting' technique in v/f control
14 How starting current of induction motor can controlled in v/fmethod?
15 Explain basic concept of V/f control. 4
16 Discuss constant slip speed closed loop control of induction motordrives. 7
17 Explain the power flow diagram of three phase induction motor andexplain each loss in brief.
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 4 -Scalar control of AC Machines
SrNo Scalar control of AC Machines
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18 Explain Constant airgap flux control scheme for induction motordrives. 7
19 Draw and discuss induction motor characteristics for below basespeed and above base speed control. 3
20 Discuss significance of v/f control of induction motor. Discuss motorcharacteristics in constant torque and constant power region. 4 7
21
Describe harmonics and harmonic torque for VSI based IM control.ORDiscuss effect of various harmonic torques of VSI based inductionmotor drive.ORExplain the effect of non sinusoidal supply on VSI.ORDiscuss the effect of harmonics on induction motor.
4 3 4
22 Draw and explain block diagram of CSI variable frequency drivewith current control. 7
23 Give the advantages of VSI based induction motor drive. 3
24 Draw and explain the block diagram of close loop control ofinduction motor using current limit control. 7 4
25 Give the advantages of CSI based induction motor drive. 3
26 Explain closed loop speed control of induction motor using slipcontrol scheme. 7 7
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 5 - Dynamic Modeling and Vector Control
SrNo Dynamic Modeling and Vector Control
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Explain d-q model of an Induction motorORDevelop the d-q model of Induction Motor in arbitrary referenceframe.ORList various frames used for control of induction motor. ExplainClarke transformation.
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2 Explain vector control model for induction motor 4 3 3
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Explain direct and indirect vector control method of an inductionmotor.ORExplain the direct vector control of an induction motor withnecessary diagram.
7 7
4 Explain vector control of PMSM.5 Explain dynamic model of PMSM.6 Explain BLDC machine drive with suitable diagram. 7 7 7 47 Write advantages of BLDC motor over conventional dc motor. 3 3
8State application of synchronous motor drive.ORState the advantages and applications of synchronous motor drives
3 3 3 7
9 State the comparison between FOC and DTC method to cotrol motor. 4 4 4 410 Explain dynamic model of induction motor. 311 Discuss the voltage flux estimator employed in direct vector control. 7 4
12 Expalin Field oriented control method in detail with suitablediagram. 7
13 Describe difference between scalar and vector control method ofelectrical drive. 4
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 5 - Dynamic Modeling and Vector Control
SrNo Dynamic Modeling and Vector Control
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14 Explain contant flux speed control of an induction motor. 7 7
15 Write brief note of Direct Torque Control method with necessarydiagram. 7
Darshan Institute of Engineering and TechnologyElectrical Engineering Department
Control of Electric Drives (2160913)Chapter : 6 -Applications of Electric Drives
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1List the components used in solar & battery powered drives.ORExplain basic structure of solar and battery powered drives
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2Explain solar powered pump drive.ORWrite a short note on solar drives.
7
3 Explain dc motor solar drive with chopper and maximum powerpoint tracker.
4 Explai solar powered pump drive using induction motor.5 Explain battery powered vehicles.6 Explain the components of electric traction.7 Explain merits and demerits of electric traction. 4 4 4 7 78 List the advantages of electrical braking. 3
9Explain important features of traction drives.ORExplain desired characteristics for drive used in traction.
3 4 7
10 Explain requirements of Servo drive.11 What is sevo? Write its applications.
12Explain control & implementation of servo drives.ORWrite a short note on servomotor drives.
4 7
13 State advantages of servo motor drives. 314 Explain basic structure of solar drive. 7
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