Shaft Driven AC Generator for Fixed Pitch Propeller

Abstract

The shaft driven AC generator system (FPP-SGS) uses a part of the power to drive a fixed-pitch propeller in order to generate sufficient electric power for the ship's requirement during normal sea going.
The FPP-SGS can substantially reduce fuel and operation costs, and its major advantages are as follows:
: Substantial reductions in fuel costs during normal sea going due to the fact that the electric power is generated by bunker oil through the main engine rather than by diesel oil through an independent generator engine,
: Great reduction in the need for maintenance and service on generator engine,
: Simplified operation in the engine room.
The FPP-SGS needs to be equipped with at least one auxiliary generator which can be engaged and disengaged with a diesel engine by a clutch.
During normal sea going, the FPP-SGS alone can provide sufficient power to meet the ship's electrical demands, and auxiliary diesel generator acts as a synchronous condenser to supply reactive power.
The auxiliary generator engine is kept in stand-by condition by disengaging the clutch.
The FPP-SGS operates in conjunction with a thyristor inverter, jointly developed by MITSUBISHI HEAVY IND. LTD. and MITSUBISHI ELECTRIC CO., LTD.