Example 1: A four-quadrant chopper operates with a switching frequency of 1kHz and supplies power to a dc motor whose armature EMF is -216 V. The input voltage of the chopper is 240 V. Find: (a) Voltage control ranges for the third and fourth quadrants of operation of the chopper (b) on-time and off-time of the modulating switch when the chopper operates in the third quadrant with the magnitude control ratio of -0.95 (c) on-time and off-time of the modulating switch when the chopper operates in the fourth quadrant with the magnitude control ratio of -0.75.

Example 1: A four-quadrant chopper operates with a switching frequency of 1kHz and supplies power to a dc motor whose armature EMF is -216 V. The input voltage of the chopper is 240 V. Find: (a) Voltage control ranges for the third and fourth quadrants of operation of the chopper (b) on-time and off-time of the modulating switch when the chopper operates in the third quadrant with the magnitude control ratio of -0.95 (c) on-time and off-time of the modulating switch when the chopper operates in the fourth quadrant with the magnitude control ratio of -0.75.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

See similar textbooks

Similar questions

Design a LabVIEW program that sweep Servo motor from 0 degrees to the specified angle and repeat Design a LabVIEW program to demonstrate a 28BYJ-48 stepper motor operating in both directions: 5 seconds anticlockwise and 5 seconds clockwise
15. Describe constant and variable frequency operation of chopper control. Describe how duty cycle is generated by saw-tooth and sinusoidal modulating signal and compare their performance
A single phase Half wave AC voltage controller has a resistive load of 16 ohms with input supply voltage of 240 V, 50 Hz. The delay angle of the thyristors is, a = 21/5. Determine a) The rms output voltage and current. b) Input power factor and Input current. c) Average output voltage and current.
With the aid of power-load angle curves explain in details i) An electronic governor’s response to frequency changes resulting from changing loads.
A single phase Half wave AC voltage controller has a resistive load of 16 ohms with input supply voltage of 240 V, 50 Hz. The delay angle of the thyristors is, a = 2T/5. Determine a) The rms output voltage and current. b) Input power factor and Input curren c) Average output voltage and current.
A boost chopper is powered by a 12-V dc power supply. What is the output voltage range of this chopper if the duty cycle can vary between 20 and 95%?
(i) A chopper circuit drives an inductive load from 360 DC supply. Given the load resistance as 8 2, the average load current as 20 A and operating frequency is 480 Hz. When the chopper is ON, 7 V is dropped. Calculate (a) conduction period (in milliseconds) (b) blocking period of the chopper (in milliseconds) (c) duty cycle of the chopper (d) draw the ON and OFF time period waveform (ii) Draw the circuit diagram of the single phase bridge rectifier which is used in two quadrant operation (RL load) and explain its operation. · Duty Cycle ON period OFF period
A DC machine with 2 poles, wave winded (retrogressive) (two layers) with 18 slots, the values of pole pitch and commutator pitch are
1) Derive the transfer function of Amature controlled DC shunt motor
A de machine is controlled by the step-down de-de converter shown below. The armature inductance La =0.2 mH and the armature resistance can be neglected. The armature current is 5A. The Buck converter is operating at the switching frequency is 30 kHz and the duty ratio is 0.8. L₁ + Answer the following questions: 1) Calculate the input voltage (Va) if the output voltage (ea = 200 V). 2) Find the ripple in the armature current (a). 3) Calculate the maximum and minimum values of the armature current (la). 4) Sketch the armature current (ia (t)) and the supply current (id (t)).
The excitation circuit of a free-excited DC motor is a single-phase full- wave uncontrolled rectifier and The armature circuit is fed with a single-phase full-wave controlled rectifier. both rectifiers for AC voltage voltage 220 V(rms) ,is 50 Hz. Excitation O resistance of motor Rf = 100, armature force resistance Ra = 2 0 and motor voltage constant Kv = 0.25 V/(A - r/s). The motor is a fixed 10Nm buy under load a) Draw the driver (converter-motor) power circuit. To rotate with 1200 d/d of the motor, b) Calculate the thyristor assembly. c) When the engine is heavily loaded, with a suitable probability value for supply voltage, armature voltage, armature flow wavelengths draw below. d) Calculate the motor power (total input power). (Note: Va = IaRa + ea, Vf = IfRf, ea = Kv Ifw and Te = Kv Ifla)
[4] The half wave ac controller has rms output voltage equal to input rms Vs at.......... (5] In single phase bidirectional ac controller, the RMS output voltage can be varied between zero to.............. of input voltage