REstable is an international collaborative research project focus on the development and demonstration of a virtual power plant providing ancillary services to the European electric grid in a high renewable penetration scenario. It is based on the “Kombikraftwerk II” project. It will demonstrate the ability of renewable energy plants to provide frequency control reserve in several EU countries, fulfilling the technical requirements demanded to traditional plants.


ReStable will innovate and push the boundaries of the state of the art in the following areas:

Flexibility forecast

Another innovation of this project is represented by the forecast of flexibility. This will be based on probabilistic production forecast for each renewable plant, a technique already mastered by ARMINES and currently applied by TSOs and RES producers. The innovation will consist in the development of a strategy to quantify the effective amount of flexibility that can be offered by each plant and each portfolio of plants at each time horizon considered taking into account not only the forecasts but also their precision and possible correlated events such as production ramps.

Virtual Power Plant

The ReStable will develop control management functions to distribute of the AGC signal through a set of heterogeneous DER of the VPP considering technical and economic criteria. These concepts will be validated before real-life demonstration through reduced-scale laboratory demonstration using power hardware-in-the-loop. The development will enable VPP to participate in frequency control services with high reliability standards and can be combined with other decision-making functions of the VPP.

Market bidding algorithm

The development of market algorithms will also allow VPPs to be better used, in terms of production potential, through a coordinated optimization of bids over short-term energy markets.

The role of DER in power systems dynamic performance

REstable will address the identification of dynamic equivalents of active distribution networks with a fleet of heterogeneous DER (e.g., wind, solar generators, CHP, mini-hydro, storage, etc) being the main goal the identification of a procedure that replaces the actual distribution network model by a simple equivalent model which has similar dynamic characteristics. Furthermore, the procedure to be identified will be validated in reduced-scale laboratory set-up using a power hardware-in-the-loop platform.