Supervisors: Nicolaos A. Cutululis (DTU Wind Energy), Kaushik Das (DTU Wind Energy), Edgar Nuno (DTU Wind Energy), Kjetil Uhlen (NTNU)
External examiners: Hans Abildgaard (Energinet.dk)
Abstract: Security and stability of high wind penetrated power system during storm conditions
Operation of transmission systems with high wind power penetration is especially challenging during storm conditions. Under stormy wind speed conditions, wind turbines protection system is designed to shut down the turbine to avoid excessive mechanical load. Sudden loss of wind power from large offshore plants is difficult to forecast accurately and it results in a large amount of power imbalance. The severity of such a wind power imbalance towards frequency stability needs to be studied for the future power system scenario where more wind power will appear in the system. In addition, the overhead transmission lines can also be affected during storms, thereby increasing their probability of failure resulting in separation of the Danish network from rest of the Continental European network. This can result in frequency changes increasing the probability of frequency instability; hence, these situations need to be studied and analyzed in details.
The objective of this Master project is to investigate how the stormy weather condition can threat the frequency stability of a highly wind penetrated power system and how to avoid the frequency going into unstable through controlling other equipment in the system. A simplified Danish power system model for frequency stability studies will be developed. Two types of unexpected events: ’Large amount of wind power loss due to a storm’ and ’the AC transmission failure caused by the storm’ will be investigated with the developed model. Suggestions regarding how to improve system frequency stability and secure operation of the system under storm conditions are proposed.