Turbo-electric marine power plant and method of regulating the same
AssigneeLicentia Patent-Verwaltungs-G.m.b.H.
InventorKlaus Kranert
Life of this patent
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Abstract
In a marine power plant which has an rpm-regulatable heavy gas turbine, a propulsion generator driven by the turbine, a propulsion motor driven by the generator and a fixed propeller driven by the motor, the turbine rpm is regulated as a function of the propeller rpm to obtain a delivered turbine output which lies above the minimum output limit of the turbine.
Claims12
In a method of regulating a turbo-electric marine power plant which has an rpm-regulatable heavy gas turbine constituting the prime mover of the power plant;
- a propulsion generator mechanically connected to the turbine;
- a propulsion motor electrically connected to the propulsion generator;
- a propeller shaft driven by the propulsion motor;
- a fixed propeller affixed to the propeller shaft;
- including the steps of controlling the speed by frequency regulation down to the minimum turbine rpm and controlling the speed by slippage regulation below the minimum turbine rpm;
- the improvement comprising the step of regulating the turbine rpm as a function of the propeller rpm to obtain a delivered turbine output which is above the minimum output limit of the turbine.
A control circuit for a turbo-electric marine power plant which has an rpm-regulatable heavy gas turbine constituting the prime mover of the power plant;
- a propulsion generator mechanically connected to the turbine and having a field winding;
- a propulsion motor electrically connected to the propulsion generator;
- a propeller shaft driven by the propulsion motor;
- and a fixed propeller affixed to the propeller shaft;
- comprising in combination:
- a. first sensor means operatively connected to said turbine for responding to the actual turbine rpm and for emitting a first signal representing the actual turbine rpm;
- b. second sensor means operatively connected to said propeller shaft for responding to the actual propeller rpm and for emitting a second signal representing the actual propeller rpm;
- c. first regulator means operatively connected to said second sensor means for receiving said second signal and for emitting a third signal as a function of said second signal, said third signal representing the desired turbine rpm;
- and
- d. second regulator means operatively connected to said first sensor means and to said first regulator means for receiving said first and third signals, respectively;
- said second regulator means emitting a fourth signal as a function of said first and third signals, said fourth signal representing the turbine rpm regulating signal;
- said second regulator means being operatively connected to said turbine for regulating the turbine rpm as a function of said fourth signal.
In a method of regulating a turbo-electric marine power plant which has an rpm-regulatable heavy gas turbine constituting the prime mover of the power plant;
- a propulsion generator mechanically connected to the turbine;
- a propulsion motor electrically connected to the propulsion generator;
- a propeller shaft driven by the propulsion motor;
- a fixed propeller affixed to the propeller shaft;
- including the steps of controlling the speed by frequency regulation down to the minimum turbine rpm and controlling the speed by slippage regulation below the minimum turbine rpm;
- the improvement comprising the steps of
- a. generating a first signal representing the actual turbine rpm;
- b. generating a second signal representing the actual propeller rpm;
- c. generating a third signal as a function of said second signal;
- said third signal representing the desired turbine rpm;
- d. generating a fourth signal as a function of said first and third signals;
- said fourth signal representing the turbine rpm regulating signal;
- and
- e. applying said fourth signal as a setting signal to said turbine for regulating the turbine rpm as a function of the propeller rpm for obtaining a delivered turbine output which is above the minimum output limit of the turbine.
Dependencies are inferred from the claim text.