Welcome to Modeling and Control of Grid-Connected Converters


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

Organizer: Professor Xiongfei Wang

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


Time: 27 - 29 May, 2020


Zip code: 


Number of seats: 60

Deadline: 6 May 2020

Important information concerning PhD courses: We have over some time experienced problems with no-show for both project and general courses. It has now reached a point where we are forced to take action. Therefore, the Doctoral School has decided to introduce a no-show fee of DKK 5,000 for each course where the student does not show up. Cancellations are accepted no later than 2 weeks before start of the course. Registered illness is of course an acceptable reason for not showing up on those days. Furthermore, all courses open for registration approximately four months before start. This can hopefully also provide new students a chance to register for courses during the year. We look forward to your registrations.