BESS Infrastructure Upgrade Project

EPS has successfully completed the power system analysis project for an existing Battery Energy Storage System (BESS). The objective of the project was to optimise the existing DC and AC infrastructure to increase the BESS power output from 35 MW to 80 MW. Using the existing AC to DC inverters and DC busbar system the power system analysis identified the limitations of the existing electrical system to allow additional batteries to be connected. EPS provided recommendations to increase capacity including the correct number of batteries and DC fuse types to limit the high prospective short circuit levels. The analysis included the following work scopes:

  • DC Short Circuit Analysis
  • DC Peak let through
  • Modelling DC Fast Acting Fuses
  • DC Arc Flash
  • Liaising with PCS, BCP, battery and DC fuse manufacturers
  • Inverter modelling including Transfer Function control parameters
  • Battery discharge calculations
  • PCS Short Circuit capability calculations
  • 33kV AC and 550V DC Protection Schemes
  • Identifying the limitations of the existing PCS’s and BCP’s
  • Transformer sizing
  • Earthing Design Modifications
  • 33 kV substation design
  • DC and AC Cable sizing

If you’re looking for an Electrical Engineering Consultancy that can provide sound advice and provide power system studies using either ETAP or DIgSILENT, including detailed primary and secondary plant design for AIS and GIS substations then contact me directly at Also visit us at

Given the tight deadlines and budget restraints, the level of service Engineering Power Solutions provided was outstanding. The offshore UPS consolidation project was engineered and designed to the platform’s requirements and offshore standards minimising platform shutdowns.

Mr Low – Petrofac Oil&Gas