The Royal Navy is pursuing the ‘All Electric’ ship under its Marine Engineering Development Strategy. This strategy envisages the use of long life, fuel efficient, advanced cycle marine gas turbine alternator sets in an Integrated Full Electric Propulsion (IFEP) system which includes the wide scale electrification of auxiliary systems. The IFEP system favoured by the Royal Navy requires just four prime movers for a typical European sided Frigate or Destroyer; two high power units (2 × 20–25MW), one medium power (1 × 4–8MW), one low power unit (1 × 1–2MW), and employs single engine operation at sea. The high power unit, the WR21, has already completed development. In December 2000 the Royal Navy placed a contract on Turbomeca Limited of France to develop a 1.8 MW advanced cycle gas turbine alternator. The paper provides details of the development of this 1.8MW gas turbine alternator know as the Advanced Cycle Low-power Gas Turbine Alternator (ACL GTA). It describes the basic engine design including recuperator, outlines the predicted performance, and gives details of the directly coupled high speed alternator and associated power electronic to provide the 800V DC output. The overall programme is discussed, along with the outstanding issues. Reference is made to the GTA’s ability to compete in a highly competitive market dominated by diesel driven alternators.

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