Reasons behind this project
As other power systems, the European grid experiences a massive RES development, bringing up many new challenges for system operation. One of such challenges is the massive penetration of Power Electronic (PE) converters (e.g. PV & wind generation units, batteries & chargers, HVDC connections, statcoms, etc.) on a large scale as they may cause instable system operation (resonance) or harmonic waves that can interfere and/or damage the neighbouring equipment.
Where a few, local (a plant) and rather simple situations had to be analysed in the past, the risk is growing exponentially, as more devices connect, as they are more diverse, as they are closer one to another. Grid regulations are all the more demanding that complex situations can actually not be addressed. And, as a consequence, strong mitigation measures are integrated in every piece of equipment, at a significant additional cost… without preventing all undesired interactions.
The development of a mathematical framework capable of simulating all components in AC-DC system for system stability assessment studies becomes crucial, in order to complement present tools, and eventually
- (i) ease the performance of stability assessment studies;
- (ii) analyse complex situations;
- (iii) refine mitigation measures; and
- (iv) lower overall equipment costs.
Harmony (“HARMONic stabilitY assessment of PE-penetrated power systems”) shall develop such a framework, with the following lines of research actions, all opensource:
- Develop an accurate mathematical description of the dynamical behavior of every power system component (CIM/CGMES & Modelica).
- Derive harmonic & dynamic phasor (DP) models.
- Develop methodologies to detect instable operating scenarios and undesired harmonic behaviour.
+ beyond research works:
- Develop methodologies to devise mitigation measures to face instability problems.
- Populate the COLib opensource platform, with the developed models and typical stability test cases.
- Foster a living opensource project and community, of users and developers and bridge it with the existing, related opensource projects (e.g. Dynawo).
Harmony is a common project, undertaken by TU Delft, TenneT and Uni. Ljubljana.