Solution & technology
2017-06 / Solar PV plant with storage in an insular grid
June 7th, 2017
Solar PV plant with storage in an insular grid
In the Martinique Island (French oversea territory in the Caribbean), the grid stability can be seriously affected by the variability of the solar PV production. The larger-scale integration of this energy, will go with the addition of storage capacities and an adapted management system which integrates forecasts of the solar production over several time scales.
On June 7th, 2017, the forecast provided the day before has under-estimated the production.
It is a day presenting a strong variability of production bound to numerous cloudy spells and a fast evolution of the cloud layer.
During the day, this forecast is updated every quarter thanks to satellite images allowing to refine the production profile for the next 30 minutes. The Figure 2 shows that this impoves strongly the accuracy of the forecasts.
When averaging this profile at a 15 minutes time step (Figure 3), the accuracy performance appears more clearly as compared with Figure 2 which is at one minute time step.
With such a display, available through Steadysun customer interface, the storage system can be managed with more efficiently, by defining the day before the optimized level of state of load to start the operation on the next day as well as the injection profile of the next day to be announced to the grid operator.
During the day, the asset manager may appeal the stored energy at best to maximize the income.