Power Management System for a 4 GW Integrated Gasification Combined-Cycle Generation Facility

This paper presents the design of a power management system (PMS) for a 4 gigawatt (GW) integrated gasification combined-cycle power plant and refinery. The facility is comprised of 5 combined-cycle power blocks, 800 MW each. The combined-cycle block consists of two gas turbines and one steam turbine. The gas turbine is one of the largest in the world that runs on synthesis gas (syngas). The facility is designed to export 2.4 GW to support the local utility, with the remaining power feeding the refinery and internal loads.The paper discusses the islanding impact on the refinery and how the fast generation-shedding and runback solution maintains power system stability after islanding. Automatic synchronization for the facility to connect back to the local utility at a 380 kV level is also covered in the paper. It also discusses a tie-flow control scheme for active and reactive power at the point of common coupling, dispatched by the local utility or plant operation. This scheme allows utility operators to control demand output at the power block level.The paper covers the automatic black start and load restoration sequence for the facility, a critical requirement and automated within the capabilities of the PMS. Contingency-based load shedding and underfrequency-based load shedding are implemented for the black start substation to ensure the reliability of the black start sequence.The electrical power system, including the syngas turbine challenging modeling, has been tested and validated using hardware-in-the-loop (HIL) simulation.