Energy storage system for grid stability – Case study

PROJECT SUMMARY
  • Project: Dresden’s electric utility adds energy storage to stabilize grid
  • Location: Dresden, Germany
  • Application: Primary regulation control (PRL)
NIDEC'S ROLE

After working with DREWAG to define its needs, Nidec ASI provided electrical engineering services for the design of the Power Conversion System, which stabilizes the network by providing up to 2 MW primary control power to the grid. Nidec ASI manufactured and supplied both the PCS components as well as the battery containers and integrated the power management system software used to operate the system that was developed by a German sub-supplier under the leadership of Nidec ASI.

Scope of Supply
Container PCS_Kühler Rückansicht
THE CHALLENGE
To improve the reliability of a municipal power utility

DREWAG is the municipal utility responsible for bringing electricity, gas and water services to the more than half a million residents of Dresden, Germany. In recent years, the grid has seen a sharp increase of renewable energy such as solar and wind, which created some instability in the city’s power supply and the need for fast responding energy storage systems able to substitute the “must run power plants“ for primary regulation.

DREWAG sought a solution that would stabilize its power supply and reduce long-term energy costs while increasing the amount of energy produced by clean, renewable sources.

THE SOLUTION
Battery Energy Storage Systems (BESS)

Working with Nidec ASI, DREWAG chose to develop and implement an innovative energy storage solution to stabilize the grid. The solution, known as BESS (Battery Energy Storage System), has a total initial capacity of 2.7 MWh of energy storage and a power of 2 MW.
It includes a Power Conversion System that allows the utility to store electricity and use it as primary balancing power. The system is designed to ensure optimum battery service life and minimize energy losses while complying with the stringent German requirements of Transmission Code 2007.