Having analysed these parameters, the VPP algorithm decides which assets are chosen to provide balancing services and form a common response from the Virtual Power Plant. From this pool, the amount of flexibility that can be offered in the individual balancing energy auctions is calculated. Among other things, this pool is also formed using data from the operation of the individual plants and their availability during the previous days.
Composition of the Pool
Contractual, economic and technical aspects play an equal role in the composition of the pool response from available plants.
The balancing power products are interdependent both in terms of their timing and the amount of potential revenue, so the composition of the balancing power quantity is created in correlation to the balancing power products. Next Kraftwerke anticipates the market before the auctions take place and derives the quantities for the individual auctions. One possible approach would be to first compile the plants for the FCR, then for the aFRR and in the last step for the mFRR in order to finally know the quantities that can be bid in the auctions for each balancing power product. If the aFRR auction is awarded for a smaller quantity than the quantity of aFRR-eligible installations in the pool, the "surplus" installations could be transferred to the mFRR pool, for instance.
In order to enable detailed planning for the provision, a forecast for the coming week is made from the current operation mode and past operational schedules. Various factors such as weather or electricity market forecasts are taken into account.
Of course, redundancies are also planned for the provision of balancing services in order to compensate for short-term downtimes of individual units and to minimise any possible bottlenecks.