Explain the concept of reactive power compensation and its role in improving power system voltage stability.
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Explain the concept of reactive power compensation and its role in improving power system voltage stability.
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- QUESTION 3 а) Describe a static energy component in power electronics fundamental. A single-phase full-wave ac voltage controller working on the ON-OFF control technique b) has a supply voltage of 230 V (RMS) 50 Hz with a purely resistive load that is connected in series as of 35 N and 10 Q. The controller is set to ON-mode for 40 cycles and off for 20 cycles. i) Justify whether the converter is operating at the optimum duty cycle (k) of> 50%. ii) Analyse the capability of the converter in supplying the load at 180 V (RMS).A single-phase, 60 Hz(input) convertor, such as shown below, operates at a synchronous carrier frequency of 300 Hz, The DC Link voltage is 680 V, and the effective value of the fundamental AC voltage E34 is 430 V. Calculate; 1) The duty cycle D, and Ton when the AC voltage is 500V. 2) The duty cycle D, and Ton when the AC voltage is -30V. 3) Draw the waveform of the convertor output. 5 EL 4-quadrant switching converter EH 2 4 6 D SeDiscuss the concept of power system stability and the methods used to analyze and control it, including transient stability and voltage stability.
- A 3-phase full converter is delivering a constant load current of 50 amps at 230 Volt DC when its input is 3-phaser, 415 Volt, 50 Hertz. If each thyristor has a voltage drop of 1.1 Volt when conducting, calculate (a) The firing angle delay (b) RMS current of SCRs (c) RMS source currents (d) The power loss in each SCR.(e) Input power factor.What is the ripple factor and what causes it? Discuss and explain how this factor can be used as a metric to improve the quality of the designed AC to DC converting systemQ1. An SCR full bridge converter supplies power to a 560 V, 50 A, separately excited DC motor with an armature resistance of 1.2 Q. The voltage drop in the bridge SCRS is 20 V and this can be assumed constant. Power is supplied by an ideal 3-phase source with a line voltage of 415 V. Find the necessary delay angle and the motor back emf for (a) motoring operation at 50 A with motor terminal voltage of 500 V, and (b) regeneration operation 50 A with terminal voltage of 500 V.
- (B) / For a step-down DC-DC converter (chopper), if the DC input voltage =150V, load resistance =102. Take a voltage drop of 2V across chopper when it is on. For a duty cycle of 0.5, calculate: (i) Average and rms values of output voltage, (ii) Chopper efficiency.What is reactive power compensation, explain why it is done by showing it on the power triangle and write its advantages in articles.Two SCRs are used in a midpoint converter arrangement. The source RMS voltage is230 V, and the frequency is 50 Hz. The load is 100 mH inductor in series with 2 .The input lines have series inductance 50 H. (a) For a phase delay of 45, plot the voltage waveform measured at the output of the midpoint converter. (b) What is the output power for 45 delay?
- h) Explain the methods of voltage control used in AC-AC converters.Design an insulated DC-DC converter. Give some detailed information about the topology yousuggested.A resistive heater is energized from 220Vms, 50 Hz sinusoidal voltage source through a transformer and controlled full wave rectifier as shown in the figure. The heating power is adjusted by the delay angle of thyristors from zero to 1 kW. Transformer turns ratio is defined as n=Npri:Nsec- n:1 All components are ideal. a) Determine the transformer turns ratio n, and the thyristor delay angle a in order to keep the secondary voltage (i.e. thyristor voltage stress) minimum at the maximum R=752 As4 As2 power of 1kW. b) Calculate the input rms current at maximum heating power. c) Sketch the input current waveform for a=90°, find its rms value. eeeeeee