Electric power system for marine vehicles
First Claim
Patent Images
1. An electric power system for marine vehicles comprising:
- a first generator for generating an AC voltage having a first magnitude;
a propulsion power system including a propulsion motor for driving a propeller of said vehicle;
means for coupling said generated AC voltage to said propulsion power system;
a ship service power system;
means for coupling said generated AC voltage to said ship service power system including means for rectifying said AC voltage to a controlled reduced magnitude DC voltage, said reduced magnitude DC voltage being less than said first magnitude AC voltage by a given value, whereby voltage transients in said propulsion power system less than said given value are automatically compensated for by said means for rectifying such that they do not affect said ship service power system; and
wherein said means for coupling said generated AC voltage to said ship service power system includes inverters for converting said reduced magnitude DC voltage into three-phase AC voltage for use by ship service loads and said inverters include insulated gate bipolar transistors (IGBTs).
15 Assignments
0 Petitions
Accused Products
Abstract
An electric power system for large marine vehicles in which one or more AC generators are shared as the ship'"'"'s propulsion power source and the ship'"'"'s electrical service power source. The voltage from the AC generator(s) is rectified to a reduced DC voltage such that voltage transients in the propulsor motor do not reflect into the ship service power system. Silicon controlled rectifier (SCR) bridges are utilized to convert the generator'"'"'s AC voltage into a reduced DC voltage. As a supplement for emergency power, a rechargeable battery is included to provide power for propulsion and ship service.
58 Citations
13 Claims
-
1. An electric power system for marine vehicles comprising:
-
a first generator for generating an AC voltage having a first magnitude; a propulsion power system including a propulsion motor for driving a propeller of said vehicle; means for coupling said generated AC voltage to said propulsion power system; a ship service power system; means for coupling said generated AC voltage to said ship service power system including means for rectifying said AC voltage to a controlled reduced magnitude DC voltage, said reduced magnitude DC voltage being less than said first magnitude AC voltage by a given value, whereby voltage transients in said propulsion power system less than said given value are automatically compensated for by said means for rectifying such that they do not affect said ship service power system; and wherein said means for coupling said generated AC voltage to said ship service power system includes inverters for converting said reduced magnitude DC voltage into three-phase AC voltage for use by ship service loads and said inverters include insulated gate bipolar transistors (IGBTs). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of providing electric power for a marine vehicle, said marine vehicle including a propulsion power system and a ship service system, said propulsion power system including a propulsion motor for driving a propeller of said vehicle and said ship service system including electronic equipment that may be damaged or disrupted by voltage transients, said method comprising the steps of:
-
generating an AC voltage having a first magnitude; coupling said generated AC voltage to said propulsion power system; causing propulsion power system voltage transients; coupling said generated AC voltage to said ship service power system electronic equipment; rectifying said AC voltage to a controlled magnitude DC voltage; reducing said DC voltage to a magnitude that is less than said first magnitude AC voltage by a given value; compensating for said voltage transients in said propulsion power system that are less than said given value so that said transients do not affect said ship service power system electronic equipment; and wherein said step of coupling includes the step of using insulated gate bipolar transistors (IGBTs) to convert said reduced magnitude DC voltage into three-phase AC voltages for use by ship service loads.
-
Specification