AC to DC Converters - Power Electronic module 2

• Module 2 AC to DC Converters
  • Lesson 9 Single Phase Uncontrolled Rectifier, objectives: Classify the rectifiers based on their number of phases and the type of devices used. ~ Define and calculate the characteristic parameters of the voltage and current waveforms. ~ Analyze the operation of single phase uncontrolled half wave and full wave rectifiers supplying resistive, inductive, capacitive and back emf type loads. ~ Calculate the characteristic parameters of the input/output voltage/current waveforms associated with single phase uncontrolled rectifiers.. contents: [ Terminologies ~ Single phase uncontrolled half wave rectifier ~ Single phase uncontrolled full wave rectifier ~ Split supply single phase uncontrolled full wave rectifier. ~ Single phase uncontrolled full bridge rectifier ]
  • Lesson 10 Single Phase Fully Controlled Rectifier, objectives: Differentiate between the constructional and operation features of uncontrolled and controlled converters ~ Draw the waveforms and calculate their average and RMS values of different variables associated with a single phase fully controlled half wave converter. ~ Explain the operating principle of a single phase fully controlled bridge converter. ~ Identify the mode of operation of the converter (continuous or discontinuous) for a given load parameters and firing angle. ~ Analyze the converter operation in both continuous and discontinuous conduction mode and there by find out the average and RMS values of input/output, voltage/currents. ~ Explain the operation of the converter in the inverter mode.. contents: [ Single phase fully controlled halfwave rectifier ~ Single phase fully controlled bridge converter ~ Operation in the continuous conduction mode ~ Operation in the discontinuous conduction mode ~ Inverter Mode of operation ]
  • Lesson 11 Single Phase Half Controlled Bridge Converter, objectives: Draw different topologies of single phase half controlled converter. ~ Identify the design implications of each topology. ~ Construct the conduction table and thereby draw the waveforms of different system variables in the continuous conduction mode of operation of the converter. ~ Analyze the operation of the converter in the continuous conduction mode to find out the average and RMS values of different system variables. ~ Find out an analytical condition for continuous conduction relating the load parameters with the firing angle. ~ Analyze the operation of the converter in the discontinuous conduction mode of operation.. contents: [ Operating principle of a single phase half controlled bridge converter ~ Single phase half controlled converter in the continuous conduction mode ~ Single phase half controlled converter in the discontinuous conduction mode. ]
  • Lesson 12 Single Phase Uncontrolled Rectifier, objectives: Draw the conduction table and waveforms of a three phase half wave uncontrolled converter supplying resistive and resistive inductive loads. ~ Calculate the average and RMS values of the input / output current and voltage waveforms of a three phase uncontrolled half wave converter. ~ Analyze the operation of a three phase full wave uncontrolled converter to find out the input / output current and voltage waveforms along with their RMS and Average values. ~ Find out the harmonic components in the input / output voltage and current waveforms of a three phase uncontrolled full wave converter. ~ Analyze the operation of a three phase full wave uncontrolled converter supplying a Capacitive - Resistive load.. contents: [ Operating principle of three phase half wave uncontrolled rectifier ~ Three phase full wave uncontrolled converter ~ Operation of a 3 phase full wave uncontrolled bridge rectifier supplying an R - L - E load ~ Operation of a three phase uncontrolled bridge rectifier supplying a capacitive load ]
  • Lesson 13 Operation and Analysis of the Three Phase Fully Controlled Bridge Converter, objectives: Draw the circuit diagram and waveforms associated with a three phase fully controlled bridge converter. ~ Find out the average, RMS valves and the harmonic spectrum of the output voltage / current waveforms of the converter. ~ Find out the closed form expression of the output current and hence the condition for continuous conduction. ~ Find out the displacement factor, distortion factor and the power factor of the input current as well as its harmonic spectrum. ~ Analyze the operation of higher pulse number converters and dual converter. ~ Design the triggering circuit of the three phase fully controlled bridge converter.. contents: [ Operating principle of 3 phase fully controlled bridge converter ~ Analysis of the converter in the rectifier mode ~ Analysis of the converter in the inverting mode. ~ Higher pulse number converters and dual converter ~ Gate Drive circuit for three phase fully controlled converter ]
  • Lesson 14 Operation and Analysis of Three Phase Half Controlled Converter, objectives: Draw the circuit diagram and waveforms of different variables associated with a three phase half controlled converter. ~ Identify the constructional and operational difference between a three phase fully controlled and half controlled converter. ~ Calculate the average and RMS value of the output dc voltage. ~ Calculate the displacement factor, distortion factor and power factor of the input ac line current. ~ Calculate the Fourier series components of the output voltage and input current waveforms. ~ Derive the closed form expression for output dc current and hence identify continuous or discontinuous conduction mode of the converter.. contents: [ Operating principle of three phase half controlled converter ~ Analysis of three phase half controlled converters ]
  • Lesson 15 Effect of Source Inductance on the Performance of AC to DC Converters, objectives: Draw the voltage and current waveforms associated with a converter taking into account the effect of source inductance. ~ Find the average output voltage of the converter as a function of the firing angle and overlap angle. ~ Estimate overlap angles under a given operating condition and hence determine the turn off time available for the thyristors. ~ Draw the dc equivalent circuit of a converter and parameterize it. ~ Find out the voltage stress on the thyristors due to commutation overlap.. contents: [ Single phase fully controlled converter with source inductance ~ Three phase fully controlled converter with source inductance ]
  • Lesson 16 Power Factor Improvement, Harmonic Reduction, Filter, objectives: Schemes for the improvement of power factor in AC-DC converters. ~ Methods for harmonic reduction in the current waveforms of the converters. ~ Types of filters used to obtain ripple free (dc) output voltage and currents, reducing the harmonics.. contents: [ Power Factor Improvement ~ Extinction Angle Control ~ Symmetrical Angle Control ~ Pulse Width Modulation (PWM) Control ~ Sinusoidal Pulse Width Modulation (SPWM) Control ~ Low Pass (L-C) Filter ~ Two Stage Filter ~ Harmonic Reduction ~ Active Shaping of Input (line) Current ]
  
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