Events at Department of Energy Technology

Industrial/PhD Course: Stability of Modern Power Systems with High Penetration of Renewable Energy


21.09.2020 kl. 08.30 - 23.09.2020 kl. 16.30



Sanjay K. Chaudhary, Aalborg University


Jayakrishnan Radhakrishna Pillai, Aalborg University
Sanjay K. Chaudhary, Aalborg University



This course deals with the stability of modern power systems with a high penetration of renewable energy sources.

Power system is undergoing tremendous transformation as non-conventional renewable energy sources like wind and photovoltaic are introduced. While such renewable sources are very good for the sustainable harnessing of energy, they are altering the way power system was designed to operate. First of all they are inherently stochastic in nature due to their dependence upon local weather conditions and secondly they do not use the conventional large synchronous generators. Their power electronic converter interface decouples them from the grid frequency interaction with respect to inertial response and synchronizing power. Moreover, their dependency upon weather may lead to wide variations in power generation capability. At the same time, they might not contribute to the grid frequency stability; especially if they are on maximum power point tracking control. In the event of faults, they have limited power to contribute to the short circuit currents.

On the positive side, the advances in power electronic converter controls, imparts them fast controllability. So they can be controlled to inject reactive current and assist voltage voltage stability. They may also be controlled to provide emulated inertia and primary frequency regulation provided that they have some energy storage.

Key topics include:

  • Review of concepts of power system stability
  • Frequency and voltage stability with a high penetration of wind and PV power
  • Control opportunities and limitations provided by the converter control in RES
  • The concepts would be demonstrated through the appropriate simulation tools like PSCAD and/or DigSILENT.

Day 1: Overview of Conventional Power System structure Modern Power System, Introduction to Power system stability by Sanjay K Chaudhary and Jayakrishnan R. Pillai (7 hours lecture, simulation exercise and discussion)

Day 2: Frequency stability and Voltage stability, by Sanjay K Chaudhary (7 hours lecture, simulation exercise and discussion)

Day 3: Transient Stability, LVRT and Small signal stability analysis, by Sanjay K Chaudhary (7 hours lecture, simulation exercise and discussion).


A basic knowledge of modern power system.

Form of evaluation

The participants will have to write a report of the simulation exercises as a part of the course. Submission of this report via Moodle is mandatory for the assessment and award of diploma.



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


Department of Energy Technology


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