A.C. to D.C. Power Converters

A.C. to D.C. power converters assignment help by experienced tutors

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Basic rectifier operation:
- Half wave Diode Rectifiers
- With /without free wheeling diode.
- Notion of Line Commutation and Freewheeling.
- Evolution of Single phase bridge from center-tap transformer-rectifier.
- Effect of source inductance and overlap angle
- Current distribution.
- Power Supply application with L & LC filter.
- Three Phase bridge rectifiers with diodes.
- Commutation Process.
- Analysis of Independent Commutations.
- Commutation overlap at high current
- Simultaneous commutations
- V-I diagram till short circuit.
- Three Pulse rectifier zigzag transformer connection for m.m.f. balancing.
- Half Controlled Operation.
Three Phase Rectifiers:
- Three Phase Rectifiers, with thyristors.
- Gating Requirements.
- Output Voltage expression
- Device voltage waveform
- Turn-off time.
- Overlap angle
- Loss of voltage
- Limit of independent commutations.
- Operation with overlapping commutations
- V-I characteristic till short-circuit at the output.
- Multi-phase rectifiers
- Basic configurations.
- Line current waveforms and rating with various transformer connections(star-star, star-delta, star-double star).
- Paralleling of bridges with inter-phase reactor.
- Sequence control of two series connected bridges.
- Two and four quadrants Operation Using Dual converter.
- Low Frequency Waveform generation using delay angle modulation.
Switch Mode rectifiers:
- Rectifier circuits with ideal switches.
- Single phase configuration with 2 & 4 switches.
- Modulation strategies (SAC, EAC, PWM).
- Two Quadrant converter operation.
- Three phase PWM Converter: Constant current operation.
- Three phase PWM Converter: Operation with constant voltage load.
Applications:
- Voltage Multipliers using diode bridges.
- High power current sources using rectifiers.
- Single phase diode rectifiers with active current shaping.
- HVDC Converters converter and their control.
- Control of three phase PWM Converter: using vector control.
- Converter control for wind power generation.
- DC distribution and microgrid applications.