A new high voltage Li-ion battery system designed to improve the stability of power distribution grids has been developed by Saft and ABB. The new system combines dynamic energy storage provided by Saft’s 5.2 kV battery, which will help respond to disruptions in the grid, with ABB’s SVC (Static Var Compensation) Light technology for dynamic voltage control.
The system is made from eight individual units based on Saft’s Intensium Flex modular, rack-mounted Li-ion modules. The units, rated at 646 V and 41 Ah, are connected in series to achieve a nominal voltage of 5.2 kV and the system can deliver 200 kW for an hour and 600 kW for over 15 minutes.
Potential applications include industries with high short term power demands as well as utility grids fed by a high percentage of variable renewable energy sources, especially wind power.
Li-ion battery technology has some key feaures that make it ideal for this sort of job:
- excellent cycling capability
- long calendar life
- high energy density
- very short response time
- high power capability both in charge and discharge
- maintenance-free design.
Saft’s Li-ion technology provides the system with precise information on the state of charge (SOC) which is a vital function in a dynamically operating energy storage system.
Saft is also supplying the control and management devices for the battery, as well as a CAN-based optical communication interface with ABB’s MACH-2 controller that will monitor the battery continuously and optimize its operation.
In addition to the development and supply of the battery system, Saft is partnering with ABB in qualification and field testing of the complete system. The battery system has already completed commissioning and bench testing at ABB’s facilities in Sweden, where its performance to specification was confirmed.
The next stage, in 2009, is for an SVC Light with dynamic energy storage to be installed in a field application in order to demonstrate its capability under a variety of network conditions, including operation with nearby wind generation.