News from the Slovenian Demonstrator
Uršula Krisper, Elektro Ljubljana d.d., Project Responsible
In summer 2019, the Slovenian demo had been completely set up and since then, it is running. The main
achievement in case of Slovenian demo is, that all planned 15 smart meters and 5 RTU’s have been
installed. The point of its installation is at the end-customer’s location, and the customers are in
Integrid the actual flexibility provider. These smart meters and RTUs send close to real time1 minute
measurements to the Virtual Power Plant (VPP) platform. The novelty is, that in our test case, the new
smart meters are instead of pooling the data; they are capable to push the data. All 20 customers, who
are also the owners of the metering data, they got also a certificate secured web access to their 1 min
measured data, over VPP GUI. With this special access, they can observe their consumption/generation at
more precise level. Some of them use this access almost every day, even only just to check their
Our demo deals with two separate, but by the aggregation functionality in common, platforms: the first
one is the market or commercial aggregation platform (cVPP), which offers the ancillary services (e.g.
mFRR, aFRR) to the Transmission System Operator (TSO). As a part of the cVPP, there is a new developed
tool, which is a kind of supporting tool to the cVPP and bases on the Traffic Light concept (TLS). The
TLS, it permits or refuses the aggregator’s request to activate a particular customer’s flexibility,
connected at the specific distribution grid node. Using the TLS, a possible local congestion or voltage
violation in the distribution grid can be prevented, as a consequence of a load or generation change.
With this solution of TLS concept, together with the cVPP, the level of distribution grid reliability
will not be compromised.
The second platform for flexibility aggregation is the “technical Virtual Power Plant” (tVPP) and this
one was developed especially for the distribution grid operators. The operator can use a so called DSO
tool, within the tVPP. Usage of the DSO tool together with the tVPP, for triggering the selected
flexibilities, the distribution system grid operator can independently from the SCADA, solve local
problems in distribution grid. Problems are solved by using or activating the available customer’s
flexibilities. This new concept could be used in in the Slovenia market of services, definitely in near
future. Currently there is no market or legislation framework which could support tVPP for DSO’s needs.
In June 2019, the concept of new services for the DSO was already presented to national regulator (The
Agency for Energy) at local stakeholder’s workshop.
Results from the demos are crucial for the KPIs calculations. In accordance to two aggregation
solutions, also the KPIs were divided into two groups: the ones that are totally business oriented, and
intended to large audience (High-Level), and these ones, which are totally technical, intended for the
internal use for making a comparison to the EDP’s KIPs or for the experts level. Doing the preselection
of the most appropriate KPIs, we focus on those one, for which also the comparison with the Portugal
demonstration can be done, since the VPP platform is tested in Portugal as well.
Further analysis of Cost-Benefit Analysis together with Scalability and Replicability is in place.
Analysis will be very important and interesting to DSO, since they could be used as guidelines for new
market of using flexibilities for DSO needs.
Elektro Ljubljana, the manager and owner of the largest electricity distribution network in Slovenia, is
one of three demonstrators in the project.
Thanks to Integrid, we enable our customers a secure access to their metering data. They can become
an active participant and users of developed VPP solutions.
We are now approaching to the final stages of our project and the main achievements recorded until now
are, that the complete Slovenian pilot is up and running and that we are in the phase of preparing for
the replicability and scalability and for the cost benefit analyses. Meantime, we will perform tests, on
predefined scenarios and will thanks to the calculated KPIs also be capable to evaluate the results even
on a public level, together with comparison with other two demos.
We are successfully following the main goal of this project, to develop the services, with the usage of
existing installed technology but with its significant improvements. Both the technical VPP (tVPP) and
the commercial VPP (cVPP), together with other software tools (forecasts of power flows in MV network,
MPOPF, load allocator, TLS and gm-hub) which enable the release of the services are running and all our
customers are with their close to-real time metering data connected to them. Solution of cVPP was
upgraded with TLS system, which evaluates and validates the flexibility bids, so there will not be any
violations on distribution grid because of activating the flexibilities (for the market services e.g.
for the TSO, the mFRR or even the aFRR). This is new approach on how the DSO has a capability to reject
the requests from cVPPs – aggregators, since they use flexibilities of RES connected to the distribution
On the other hand, the tVPP is a novel tool for the DSO. It enables the flexibilities aggregation (grid
operation needs). Currently the Slovenian legislation framework does not yet anticipates this kind of a
market. The Integrid’s project concept together with the new services and tools have already been
presented to national regulator, Agency for Energy.