Generation Control System: Using Isochronous Load-Sharing Principles With Gas and Steam Turbine Generators

Abstract

A liquefied natural gas facility in the United States is being expanded to allow the liquefaction of natural gas and exportation of liquefied natural gas while keeping intact its existing import facilities. This means it will add more loads and steam-based generation to its existing gas turbine generator (GTG ) portfolio. The upgraded system will feature six GTG s and two steam turbine generators (STGs) in an islanded plant with no grid connection. This article reveals the fundamentals of how the plant performs isochronous load sharing in an islanded power system with various makes and sizes of generators (steam and gas turbines) and details the decentralized generation control system interface methodology with automatic speed governors and voltage regulators. Also presented are some topics that are crucial for industrial power systems-particularly in islanded configurations-as well as the transient simulations performed in a controlled lab environment that analyze system stability and help finalize the generator modes of operation.