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US 6,191,500 B1Granted
System and method for providing an uninterruptible power supply to a critical load
AssigneeKling Lindquist Partnership, Inc.
InventorJohn H. Toy
Life of this patent
Estimating the term…
Abstract
A system and method for providing an uninterrupted supply of power to a critical load includes at least two uninterruptible power supply UPS modules that receive power from separate utility sources. A controller controls the UPS modules so that the output power from one UPS module is substantially in-phase with the output power from the other UPS module. As a result, the output powers from the UPS modules can be combined with one another to provide a sufficient source of uninterruptible power to the critical load regardless of the phase difference in the power provided by the separate utility sources.
Claims18
A system for providing an uninterruptible supply of power to a critical load comprising:
- a first secondary main switchboard electrically coupled to a first utility source via a first main breaker, said first main breaker normally closed;
- a second secondary main switchboard electrically coupled to a second utility source via a second main breaker, said second main breaker normally closed;
- a first switchboard electrically coupled to said first secondary main switchboard via a first feed and a first feed breaker and electrically coupled to said second secondary main switchboard via a first alternate feed and a first alternate feed breaker, said first feed breaker normally closed and said first alternate feed breaker normally opened;
- a second switchboard electrically coupled to said second secondary main switchboard via a second feed and a second feed breaker, and electrically coupled to said first secondary main switchboard via a second alternate feed and a second alternate feed breaker, said second feed breaker normally closed and said second alternate feed breaker normally opened;
- a first uninterruptible power supply (UPS) module electrically coupled to said first switchboard via a first UPS feed and a first UPS feed breaker, said first UPS feed breaker normally closed;
- a second UPS module electrically coupled to said second switchboard via a second UPS feed and a second UPS feed breaker, said second UPS feed breaker normally closed;
- a UPS paralleling switchgear electrically coupled to said first UPS module via a first UPS output line, and electrically coupled to said second UPS module via a second UPS output line, wherein said UPS paralleling switchgear combines power from said first UPS module with power from said second UPS module so that said first UPS module and said second UPS module equally share the critical load.
4 more elements
A system for providing an uninterruptible power supply (UPS) to a critical load comprising:
- first secondary main switchboard coupled to a first utility source;
- second secondary main switchboard coupled to a second utility source;
- first switchboard coupled to said first secondary main switchboard;
- second switchboard coupled to said second secondary main switchboard;
- first UPS module coupled to said first switchboard;
- second UPS module coupled to said second switchboard;
- and
- UPS paralleling switchgear coupled between said first and second UPS modules and said critical load;
- wherein each UPS module comprises a motor generator mechanically preadjusted so that its power output is out-of-phase from its received power.
6 more elements
A system for providing an uninterruptible supply of power to a critical load comprising:
- a first uninterruptible power supply (UPS) module electrically coupled to a first utility source that receives power from the first utility source and that generates a first output power;
- a second UPS module electrically coupled to a second utility source that receives power from the second utility source and that generates a second output power, wherein the power from the first utility source is out-of-phase with the power from the second utility source;
- a paralleling bus electrically coupled to said first and second UPS modules and to the critical load;
- a controller that controls said first UPS module and said second UPS module so that the phase of said first output power is substantially the same as the phase of said second output power when said first and second output power are combined on said paralleling bus;
- and
- a ring bus electrically coupled between said paralleling bus and the critical load that receives said combined power from said paralleling bus and that provides said combined power to the critical load via at least two separate feeds,
- wherein said first UPS module comprises a first motor-generator electrically coupled to said first utility source that receives power from said first utility source and that generates said first output power,
- wherein said second UPS module comprises a second motor-generator electrically coupled to said second utility source that receives power from said second utility source and that generates said second output power, and
- wherein each motor-generator is mechanically preadjusted so that its output power is out-of-phase from its received power by a predetermined amount.
6 more elements
A method for providing an uninterruptible supply of power to a critical load, the method comprising the steps of:
- receiving power from a first utility source at a first uninterruptible power supply (UPS) module;
- receiving power from a second utility source at a second UPS module;
- generating a first output power from said power received from the first utility source using said first UPS module;
- generating a second output power from said power received from the second utility source using said second UPS module;
- controlling said second UPS module so that said second output power is substantially in phase with said first output power;
- combining said first output power and said second output power;
- and
- providing said combined powers to the critical load,
- wherein said step of generating said first output power comprises the step of generating said first output power from said power received from the first utility source using a first motor-generator in said first UPS module,
- wherein said step of generating said second output power comprises the step of generating said second output power from said power received from the second utility source using a second motor-generator in said second UPS module,
- wherein said step of receiving power from the second utility source comprises the step of receiving power from the second utility source that is out-of-phase with the power received from the first utility source,
- wherein said step of controlling said second UPS module comprises the step of controlling said second motor-generator so that said second output power is substantially in phase with said first output power, and
- wherein said method further comprises the step of preadjusting said second motor-generator so that said second output power generated by said second motor-generator is out-of-phase with the power received from the second utility source by a predetermined amount.
10 more elements
Dependencies are inferred from the claim text.