Effects of Fluctuating Wind Energy Feeding on the Control- and Thermodynamic Operating Characteristics of Conventional Power Plants in Germany - Stocktaking and Deduction of Future Demands

Project Number 283

Due to the energy output fluctuations, wind power plants cause problems regarding energy transfer, reduced availability for meteorological reasons and the resulting required "Hour reserve from conventional thermal power plants". Wind energy fluctuations at simultaneous load fluctuations and non-recorded feeding from decentralized generation lead to considerable positive and negative control capacities to be kept in the conventional thermal power plants at simultaneous high dynamic load, these are actually not designed for.

This project's goal is thus analysis of the expected demands to the conventional thermal power plants in the German energy supply system, elaboration of the system services and control strategies then to be offered by these power plants, as well as design of old and to be newly constructed conventional thermal power plants with regard to optimum operation under changed conditions. Moreover, effects of the results on actual technical and legal standards (e.g. EEG and TransmissionCode 2003) are investigated. The planned investigations will be an optimum supplement to the tasks of the dena grid study II (refer to Project No. 288), where effects on the generation facilities are treated only marginally.

The aim of this project is to detect the concrete effects of wind energy feeding on the operation of existing power plants, in particular on changes compared to the design mode of operation and the amended load. From these facts, demands to the design of future power plants are to be deducted, especially regarding:

  • Minimum load, controllability, load change velocity,
  • Control capacity to be kept per unit, control strategy,
  • Size of capacity, optimum point, storing characteristics and utilisation.

It is to be elaborated which power plants (classified by type and year of construction) are already prepared for careful balancing of fluctuating wind energy, which ones will perhaps have to be reinforced and which ones are not suited for this purpose. It has to be investigated in particular, at which load limits this task can be fulfilled. Thus, indicators for low-cost, optimum mode of operation of the plants can be determined.

The project will be headed by Professor Harald Weber at the Rostock University and realised by the Chair for Electrical Energy Technology from June 2006 to April 2009, under co-operation of the Chair for Technical Thermodynamics (Professor Egon Hassel). The Technical Committee "Electrical Engineering, I&C, and IT " will support the investigations.