Method of controlling the renewable energy use in an LNG train
AssigneeNuovo Pignone Tecnologie Srl
InventorsGiuseppe Sassanelli, Giampaolo Gabbi, Carmine Allegorico, Giulia Rontini
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Abstract
A method of controlling the renewable energy absorbed by a hybrid power train for driving a load, and in particular compressors for a liquefied natural gas (LNG) plant is disclosed. The method comprises an analysis of the health status of part and of the whole hybrid power plant that drive the load. A power plant is also disclosed, operated by the controlling method.
Claims13
A method of controlling the renewable energy absorbed by a hybrid power train for driving a load, wherein the hybrid power train comprises one or more equipment, comprising a gas turbine and an electric motor/generator, wherein the electric motor/generator and is connected to a power generation plant (PG) and to a renewable energy source (PV), wherein the method comprises the steps of:
- detecting the one or more input parameters (Pij) of each equipment to determine the initial condition of at least one of the equipment;
- applying a first conditional statement, wherein the first conditional state-ment determines a combined membership function (Mem+vfd), of at least one or more equipment, having two or more qualification states as output, so that
- if the combined membership functions (Mem+vfd) of the equipment has qualification state such that the checked equipment operate correctly, then the step of applying a second conditional statement is carried out to the renewable energy source (PV), so as to determine the membership functions (Mpv) of the renewable energy source (PV) having two or more qualification states as output, so that
- if the membership functions (Mpv) of the renewable energy source (PV) has a qualification state such that the renewable energy source (PV) does not operate correctly, then the step of applying a third conditional statement to the power generation plant (PG) is carried out, so as to determine the membership functions (Mpg) of the power generation plant (PG) having in two or more qualification states as output, so that
- if the membership functions (Mpg) of the power generation plant (PG) has a qualification state such that power generation plant (PG) does not operate correctly, then change of load split between the gas turbine and the electric motor/generator;
- if the membership functions (Mpv) of the renewable energy source (PV) has a qualification state such that the renewable energy source (PV) operates in a correct way, then the power generated by the gas turbine and the energy absorbed by the renewable energy source (PV) is determined according to an objective function;
- else, if the combined membership functions (Mem+vfd) has qualification state such that the equipment checked does not operate correctly, then carrying out the load split between the gas turbine and the electric motor/generator.
A power plant comprising:
- a hybrid power train having:
- a through a shaft,
- a gas turbine, mechanically connected to the shaft;
- an electric motor/generator, mechanically connected to the shaft;
- a variable frequency device, connected to an electric motor/generator, and a power generation plant (PG) and to a renewable energy source (PV), wherein the variable frequency device is operable to allow the electric motor/generator transforming the energy from the power generation plant (PG) and the renewable energy source (PV) to drive the load or to help the operation of the gas turbine;
- and
- a plant control unit operably connected to the gas turbine,
- the electric motor/generator, and the variable frequency device,
- wherein the plant control unit is configured to control the hybrid power train to maximize the energy used coming from the renewable energy source (PV) by maximizing the driving load of the electric motor/generator, and
- wherein the load of the gas turbine is kept above the combustor premix transfer threshold (PmxLoad);
- and
- a load mechanically connected to the shaft.
Dependencies are inferred from the claim text.