Control of Four GE Frame 5 Peaking Units for South Carolina Electric & Gas

HPI supplied a standardized control system solution for South Carolina Electric & Gas’ (SCE&G) fleet of combustion gas turbine engines at the Parr Generating Power Station. The new system has provided consistent, repeatable, and reliable starting and running as required for the remote control of an unmanned site consisting of four Frame 5 peaking units.

SCE&G is the principle subsidiary of the SCANA Corporation, and serves close to 300,000 natural gas customers and generates electricity for 600,000 retail and wholesale customers throughout the state of South Carolina.

Based on HPI’s extensive knowledge of the requirements for controlling a variety of gas turbines, SCE&G chose HPI to standardize the control system for its corporate fleet of combustion gas turbine engines. Because of HPI’s experience, HPI provided a proven control solution with software and hardware that reduced both the initial design phase and the final commissioning of the final system.

The existing control system was completely removed and replaced with a new Allen-Bradley ControlLogix™ PLC controller. This PLC contains the software for the gas turbine controls such as remote start, stop, and auxiliary system sequencing. To reduce the amount of onsite wiring required, all the terminals, fuses, relays, and conduits were supplied mounted on subpanels. The SCE&G benefits of having an HPI-based digital turbine control system, included:

  • Ease of retrofit onto existing turbine units
  • High performance from modern technology
  • User-friendly HMIs with enhanced turbine control and diagnostics information