Methods of operating dual fed systems
AssigneeGE Energy Power Conversion Technology Limited
InventorRichard Ian Stephens
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Abstract
A method of operating a dual fed system is described where power is supplied to a electrical load from first and second ac busbars at a ratio that achieves a desired level of exhaust emissions such as nitrogen oxides (NOx), carbon dioxide (CO2) and other pollutants produced by the prime movers associated with generators. Preferably, the method may be used to operate a dual fed marine propulsion system wherein the electrical load is a thruster. Operating a dual fed marine propulsion system using the method of the present invention makes it possible to optimize thrust allocation between thrusters in a way that is similar to that used in conventional dynamic positioning (DP) systems and then share or allocate the required power between generators to minimize exhaust emissions.
Claims19
A method of operating a dual fed system comprising a first busbar, a second busbar, (i) at least one generator connected to the first busbar and having an associated prime mover that produces exhaust emissions, at least one generator connected to the second busbar and having an associated prime mover that produces exhaust emissions, and an electrical load connected to the first busbar by means of a first power converter and to the second busbar by means of a second power converter, the method comprising:
- selecting a desired level of exhaust emissions from the prime movers, the selecting including minimizing, according to a power constraint, a cost function formed from estimated nitrogen dioxide and carbon dioxide emission rates of the prime movers;
- and
- supplying power to the electrical load from the first and second busbars at a ratio that achieves the desired level of exhaust emissions.
A dual fed system comprising:
- a first busbar;
- a second busbar;
- at least one generator connected to the first busbar and having an associated prime mover that produces exhaust emissions;
- at least one generator connected to the second busbar and having an associated prime mover that produces exhaust emissions;
- an electrical load connected to the first busbar by means of a first power converter and to the second busbar by means of a second power converter;
- and
- a management system which (i) selects a desired level of exhaust emissions from the prime movers by minimizing, according to a power constraint, a cost function formed from estimated nitrogen dioxide and carbon dioxide emission rates of the prime movers and (ii) controls the dual fed system so that power is supplied to the electrical load from the first and second busbars at a ratio that achieves the desired level of exhaust emissions.
Dependencies are inferred from the claim text.