Control-Dynamic Power Plant- and Grid Interaction in a Deregulated Power Industry - Power Plant Load Reduction Options

Project Number 243

Decades of close co-operation both among power plant- and grid operators and among the load distributors of the various interconnected electricity suppliers has been considerably cut by the introduction of the deregulated energy industry.

Nevertheless, to ensure organised co-operation of power plants and grid, the transmission grid operators have converted the DVG advices into the grid code newly released by the VDN. For the same reason, the primary-, secondary- and tertiary (minute) reserve capacities to be held by the individual transmission grid suppliers are made out. Further, new instructions have been released for grid operation regarding nominal frequency for primary and secondary control as well as for correction of deviations from synchronous time.

Some of these new instructions have caused consequences in power plant operation, which not occured in the past.

Moreover the non-set value-directed realisation of the energy transactions made on the energy markets with considerable time-synchronous target output changes at least possibly defined instants negatively affects the resulting control characteristics of power plants and grid.

Within the framework of this research project on the basis of power plant-/grid simulation investigations therefore goal-directed analyses of the control-dynamic interaction of power plants and grids are to be realised; on the basis of these investigations the following questions can be answered:

  • Which demands from the grid-side cannot be realised control-dynamically by the power plants and have therefore to be modified?
  • How can power plant operation be optimised with regard to the control-dynamic interaction with grid operation?
  • Which negative consequences for power plant operation are inevitable and have to be accepted by the power plant operators?

Thus, a scientific basis for negotiations among power plant- and grid operators is to be created. If on the basis of the project results the grid operation regulations were correspondingly modified, a reduced dynamic strain of the relevant power plant units as well as less utilisation of the reserve capacities negotiated on the control energy market and thus to be held out as per contract could be achieved. Both aspects would serve the reduction of maintenance- and production costs.

The project will be realised from June 2003 to February 2005 by the Electricity Generation and Automatisation Dept. at the Institute for Process Control and Steam Boiler Operation of the Stuttgart University by Prof. Ernst Welfonder. The Technical Committee "Electrical Engineering, I&C and IT" will technically support the investigations.