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Events at Department of Energy Technology

Industrial/PhD Course: Modeling and Control of Grid-Connected Converters

Time

27.05.2020 kl. 08.30 - 29.05.2020 kl. 16.00

Description

Organizer

Professor Xiongfei Wang

Lecturers

Prof. Lennart Harnefors, ABB Corporate Research/KTH, Sweden
Prof. Xiongfei Wang, Aalborg University, Denmark

ECTS: 3

Description

Grid-connected converters have commonly been used with renewable power generations, flexible ac/dc power transmission systems, regenerative drives, etc. As the increasing use of converters in electrical grids, the dynamic modeling and control of converters become critical for building a stable power-electronic-based power system. This course thus devotes to provide a design-oriented analysis on the control dynamics of grid-connected converters, covering the fundamental and state-of-the-art of modeling, stability analysis and control topics, including:  

  • Vector current control
  • Complex-valued frequency-domain modeling
  • Impedance-based stability analysis
  • Grid synchronization control and its stability impact
  • DC-link and ac-bus voltage control
  • Robust damping control techniques

Day 1: Vector Current Control, Prof. Xiongfei Wang (3 hours), Prof. Lennart Harnefors (3 hours)

  • Space vectors and coordinate transformation
  • Small-signal modeling of converter power stage
  • Design of vector current controller and its anti-windup
  • Influences of time delay and LCL-filter resonance
  • Harmonic current control and practical design

Day 2: Grid Synchronization and Power Control, Prof. Lennart Harnefors (3 hours), Prof. Xiongfei Wang (3 hours)

  • Phase-Locked Loop (PLL): small-signal modeling and parameter tuning
  • Influence of PLL on grid-converter interactions
  • Impedance-based modeling and stability analysis
  • Stability of DC-link Voltage Control (DVC)
  • Stability of AC-bus Voltage Control (AVC)

Day 3: Robust Damping Control, Prof. Xiongfei Wang (3 hours), Prof. Lennart Harnefors (3 hours)

  • Virtual impedance control
  • Passivity-based current control
  • Power-synchronization control  
  • Step-by-step design cases

Prerequisites

Prior knowledge of three-phase systems, power electronics fundamentals, feedback control theory are preferred.  

Form of evaluation

Exercises and report

Registration

https://phd.moodle.aau.dk

Price

6000 DKK for PhD students outside of Denmark and 8000 DKK for the Industry.

Host

Department of Energy Technology

Address

Aalborg University, Pontoppidanstræde 101, room 1.015, 9220 Aalborg East