Events at Department of Energy Technology

Industrial/PhD Course: Power Quality and Synchronization Techniques in Microgrids


24.02.2021 kl. 08.30 - 26.02.2021 kl. 16.30



Professor Josep M. Guerrero, Aalborg University, Denmark
Professor Juan C. Vasquez, Aalborg University, Denmark


Professor Josep M. Guerrero (Aalborg University)
Associate Professor Mehdi Savaghebi (University of Southern Denmark)
Lecturer Alexander Micallef (University of Malta)
Assistant Professor Saeed Golestan, Postdoctoral researcher (Gibran Tinajero)



Microgrids as one of the main building blocks of the smart grids which facilitate implementation of many smart grid functions and services. It is expected that in a near future, smart grids shall emerge as well-planned plug-and-play integration of microgrids which interact through dedicated highways for exchanging commands, data, and power. Providing a high power quality for
the customers is one of the main objectives in smart grids. On the other hand, the proliferation of different nonlinear and single-phase loads in electrical systems has resulted in voltage harmonic and unbalance as two common power quality problems.
In addition, harmonic resonances can be excited giving rise to significant increase of the voltage distortion. These phenomena can cause variety of problems such as protective relays malfunction, overheating of motors and transformers and failure of power factor correction capacitors.

In this course, measurement, compensation and damping of the main power quality phenomena will be addressed through several control approaches. Both three-phase and single-phase voltage source inverters will be considered. The modelling and control of these power electronic converters are discussed and hierarchical (centralized and decentralized) control approaches are presented in order to enhance the voltage quality. As the synchronization system of power converters plays a key role in their performance in the presence of power quality problems, modelling, designing, and tuning of advanced synchronization systems, including phase-locked loops (PLLs), frequency-locked loops (FLLs), and open-loop synchronization systems, are also discussed. Several simulation exercises will be included in labs which cover about 50% of the course time

  • Day 1: Power Quality in Microgrids, Harmonic Compensation and Virtual Impedance Concept for PQ Improvement:  Lecturer: Josep Guerrero (1h), Alexander Micallef (4h), Juan Vasquez (0.5h), Gibran Tinajero (0.5)

  • Day 2: Primary and Secondary Control for Harmonic and Unbalance Compensation in Microgrids: Lecturer: Josep Guerrero(1h),  Mehdi Savaghebi (4), Juan Vasquez (0.5h), Gibran Tinajero (0.5)

  • Day 3: Synchronization of Power Converters: Introduction, Design and Analysis: Lecturer: Saeed Golestan (6 hours)

The lectures on day 3 are divided into four parts:

  1. he first part includes a general description of a standard PLL structure and its modeling, tuning and analyzing its key features, designing advanced PLLs and their modeling and tuning aspects for both single-phase and three-phase systems.
  2. The second part includes describing the historical developments of standard single-phase and three-phase FLLs, their modeling and tuning aspects, and extending their structures to deal with power quality problems.
  3. The third part includes describing key features of open-loop synchronization systems and presenting two general approaches for designing them.
  4. The last part includes a brief description of the dynamic interaction between the power converters and its synchronization system, and modeling and analyzing this interaction.


MATLAB/Simulink SIMPowerSystem knowledge is recommended for the exercises.

Form of evaluation:

The participants will be grouped and asked to team work on several case study scenarios and tasks proposed along the course. The assessment in this course will be done through active participation in combination with delivery of exercises reports.


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


Department of Energy Technology, Aalborg University


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

Registration Deadline

03.02.2021 kl. 23.59

Register at