Digital Control of Power Processing Circuits (Dept. Elec. II) (182405)  


Sr. Topics Teaching Hours Module Weightage
Review of modern power electronics – Importance of digital control – Trends and perspective
Single Phase VSI & PWM
Fundamental components – Required additional electronics: driving and sensing – Principle of operation – Dead times – Low level control of the voltage source inverter
PWM modulation – Analog PWM: the naturally sampled implementation – Digital PWM: the uniformly sampled implementation – Single update and double update PWM model – Minimization of modulator delay – Motivation for multisampling – Analog control approaches – Linear current control: pi solution – Non-linear current control: hysteresis control
Digital Current Mode Control
Requirements of the digital controller – Signal conditioning and sampling – Synchronization between sampling and PWM – Quantization noise and arithmetic noise – Basic digital current control implementations Proportional Integral Controller
Overview – Simplified dynamic model of delays – The proportional integral controller: discretization strategies – Effects of the computation delay – Derivation of a discrete time domain converter dynamic model – Minimization of the computation delay – The predictive controller
Phase Inverter
The  transformation – Space Vector Modulation - Vector modulation based controllers – The rotating reference frame current controller – Park’s transformation – The rotating reference frame pi current controller – A different implementation of the rotating reference frame pi current controller
External Loop Control
Modeling the internal current loop – Design of voltage controllers – Possible strategies: large and narrow bandwidth controllers – The DFT filter based voltage controller – Other applications of the current controlled VSI – The controlled rectifier – The active power filter