Overview of power electronic converters : Electronic switches – DC – DC converters – DC – AC voltage source inverter – Voltage source and current source inverters – Multilevel inverter – diode clamped inverter – Multilevel inverter – flying capacitor inverter.
Applications of voltage source converter : Applications of voltage source converter – I (motor drives, active rectifiers) – Applications of voltage source converter – II (reactive current and harmonic compensation).
Purpose of pulsewidth modulation (PWM) : Review of Fourier series – Harmonic voltages and their undesirable effects.
Pulsewidth modulation at low switching frequency : Low switching frequency operation of a VSI – I (square wave operation, one switching angle per quarter) – Low switching frequency operation of a VSI – II (Two switching angles per quarter) – Selective harmonic elimination and THD optimized PWM.
Triangle-comparison based PWM : Sine-triangle modulation – Third harmonic injection PWM (THIPWM) – Bus-clamping PWM
Space vector-based PWM : Concept of space vector – Conventional space vector PWM and bus-clamping PWM – A unified perspective of triangle-comparison and space vector based PWM – Advanced bus-clamping PWM.
Analysis of line current ripple : Transformation from stationary reference frame to synchronously revolving dq reference frame – Volt-second balance and instantaneous error voltage – Calculation of RMS line current ripple – Space vector-based hybrid PWM for reduced line current ripple.
Analysis of dc link current : Inverter state and dc link current – Average and RMS values of dc link current.
Analysis of torque ripple : Calculation of harmonic torques and RMS torque ripple – Hybrid PWM techniques to reduce ripple torque.
Inverter loss : Evaluation of conduction loss – Dependence of switching loss on power factor and modulation method – PWM techniques for reduced switching loss.
Effect of inverter dead-time : Effect of dead-time with continuous modulation – Effect of dead-time with discontinuous or bus-clamping PWM.
Overmodulation : Per-phase approach to overmodulation – Space vector approach to overmodulation – A perspective from the synchronously revolving d-q reference frame.
PWM for multilevel inverters : Extension of sine-triangle modulation to three-level inverters – Extension of conventional space vector modulation to three-level inverters – Analysis of line current ripple and torque ripple.
This Course is provided by IISc Bangalore as part of NPTEL online courses.
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