Stand-alone electrical system for large motor loads
AssigneeConocoPhillips Company
InventorJohn R. Seiver
Life of this patent
Estimating the term…
Abstract
An electrical power system that can be used to interconnect a plurality of generators to a plurality to loads while being rated at less than a total power consumed. The system is preferably used to distribute power for a Liquefied Natural Gas (LNG) facility. The system broadly comprises a primary bus connected between the generators and the loads, such as electrical compressor motors used in the LNG facility. The generators and the loads are arranged along the primary bus in order to distribute the power from the generators to the loads, without overloading the primary bus.
Claims33
An electrical power system comprising:
- a plurality of generators;
- a plurality of loads that when summed determine a total power consumed which is provided by the generators, wherein the generators produce power at a voltage level of a largest one of the loads;
- and
- a bus electrically connecting each of the generators with each of the loads, wherein the bus is rated at less than the total power consumed but carries all of the total power consumed from the generators to the loads without overloading the bus.
An electrical power system comprising:
- a plurality of generators;
- a plurality of loads that when summed determine a total power consumed which is provided by the generators;
- and
- a bus electrically connecting each of the generators with each of the loads, wherein the bus is rated at less than the total power consumed but carries all of the total power consumed from the generators to the loads without overloading the bus, and wherein the bus is rated at more than 2000 volts and more than 1000 amps, thereby determining a power rating,
- wherein at least one of the loads requires more than the power rating.
A liquefied natural gas (LNG) facility employing one or more refrigerants to cool a natural gas stream, said LNG facility comprising:
- a plurality of compressors to compress said one or more refrigerants;
- a plurality of electric motors to drive the compressors, wherein each motor contributes to a total power consumed and consumes power at a voltage level, wherein the voltage level is set at the voltage requirement of a largest one of the motors;
- a plurality of generators to power the motors, each producing power at the voltage level;
- and
- a bus rated at the voltage level to carry all of the total power consumed from the generators to the motors without overloading the bus,
- wherein each generator and motor is substantially directly connected to a different point along the bus such that the total power consumed does not flow through any one point of the bus and at least one of the motors requires more than the power rating of the bus.
A method of designing an electrical power system to supply power to electric motors, the method comprising the steps of:
- (a) summing the motors' power requirements, thereby calculating a total power consumed;
- (b) calculating a quantity of generators, each having a given generation capacity, to adequately supply the motors' power requirements, wherein the generators produce power at a voltage level of a largest one of the motors;
- (c) adding one to the quantity, thereby accommodating all of the motors if one of the generators should cease supplying power to the system;
- (d) selecting a bus to electrically connect each of the generators with each of the loads, wherein the bus is rated at less than the total power consumed but carries all of the total power consumed from the generators to the motors without overloading the bus;
- and
- (e) determining where each generator and each motor should be connected to the bus in order to prevent the bus from becoming over-loaded.
Dependencies are inferred from the claim text.