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Three Phase Controlled Rectifiers

Three Phase Controlled Rectifiers. 1. 3 Phase Controlled Rectifiers. Operate from 3 phase ac supply voltage. They provide higher dc output voltage. Higher dc output power. Higher output voltage ripple frequency.

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Three Phase Controlled Rectifiers

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  1. Three Phase Controlled Rectifiers 1

  2. 3 Phase Controlled Rectifiers • Operate from 3 phase ac supply voltage. • They provide higher dc output voltage. • Higher dc output power. • Higher output voltage ripple frequency. • Filtering requirements are simplified for smoothing out load voltage and load current. 2

  3. Extensively used in high power variable speed industrial dc drives. • Three single phase half-wave converters can be connected together to form a three phase half-wave converter. 3

  4. 3-Phase Half Wave Converter(3-Pulse Converter) with RL LoadContinuous & ConstantLoad Current Operation 4

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  6. Vector Diagram of 3 Phase Supply Voltages 6

  7. 3 Phase Supply Voltage Equations 7

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  9. van vbn vcn van 9

  10. Each thyristor conducts for 2/3 (1200) Constant Load Current io=Ia Ia Ia 10

  11. To Derive an Expression for the Average Output Voltage of a 3-Phase Half Wave Converter with RL Loadfor Continuous Load Current 11

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  20. 3 Phase Half Wave Controlled Rectifier Output Voltage Waveforms For RL Load atDifferent Trigger Angles 20

  21. =300 =600 21

  22. =900 22

  23. 3 Phase Half Wave Controlled Rectifier With R Load andRL Load with FWD 23

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  25. 3 Phase Half Wave Controlled Rectifier Output Voltage Waveforms For R Load or RL Load with FWDatDifferent Trigger Angles 25

  26. =00 =150 26

  27. =300 =600 27

  28. To Derive An Expression For The Average Or Dc Output Voltage Of A 3 Phase Half Wave Converter With Resistive Load Or RL Load With FWD 28

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  33. Three Phase Semiconverters • 3 Phase semiconverters are used in Industrial dc drive applications upto 120kW power output. • Single quadrant operation is possible. • Power factor decreases as the delay angle increases. • Power factor is better than that of 3 phase half wave converter. 33

  34. 3 Phase Half Controlled Bridge Converter (Semi Converter)with Highly Inductive Load & Continuous Ripple free Load Current 34

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  36. Wave forms of 3 Phase Semiconverter for  > 600 36

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  44. Wave forms of 3 Phase Semiconverter for  600 44

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  48. To derive an Expression for the Average Output Voltage of 3 Phase Semiconverter for  >  / 3 and Discontinuous Output Voltage 48

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