Events at Department of Energy Technology

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

This course is postponed. New date will be announced ASAP!


11.08.2021 kl. 08.30 - 13.08.2021 kl. 16.30



Professor Xiongfei Wang, Aalborg University, Denmark 


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

ECTS:  3  


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  


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

Form of evaluation: 

Exercises and report  


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


Department of Energy Technology, Aalborg University



Registration Deadline

20.04.2021 kl. 23.59

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