Voltage recovery device for use with a utility power network
First Claim
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1. A voltage recovery device for connection to a utility power network including a transmission network for carrying a nominal voltage within a first predetermined voltage range;
- a distribution network, electrically connected to the transmission network, for carrying voltages within a second predetermined voltage range, lower than the first predetermined voltage range, the distribution network having distribution lines coupled to at least one load, the voltage recovery device comprising an inverter electrically coupled in shunt to the distribution network and configured to transfer, in response to a fault condition detected on the utility power network, reactive power between the distribution network and voltage recovery device at a level and for a duration sufficient to recover the voltage on the utility power network to within a predetermined proportion of the nominal voltage.
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Abstract
A voltage recovery device is configured to provide reactive power to a utility power network at a level and for a duration sufficient to recover the voltage on the utility power network within a predetermined proportion of the nominal voltage, following a fault condition detected on the utility power network. In operation, the voltage recovery device reduces the overall transmission losses in a utility power system.
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Citations
20 Claims
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1. A voltage recovery device for connection to a utility power network including a transmission network for carrying a nominal voltage within a first predetermined voltage range;
- a distribution network, electrically connected to the transmission network, for carrying voltages within a second predetermined voltage range, lower than the first predetermined voltage range, the distribution network having distribution lines coupled to at least one load, the voltage recovery device comprising an inverter electrically coupled in shunt to the distribution network and configured to transfer, in response to a fault condition detected on the utility power network, reactive power between the distribution network and voltage recovery device at a level and for a duration sufficient to recover the voltage on the utility power network to within a predetermined proportion of the nominal voltage.
- View Dependent Claims (2, 3, 4, 5)
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6. A method of stabilizing a utility power network including a utility power network having a transmission network for carrying a nominal voltage within a first predetermined voltage range and a distribution network, electrically connected to the transmission network, for carrying voltages within a second predetermined voltage range, lower than the first predetermined voltage range, the distribution network having distribution lines couples to at least one load, the method comprising:
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electrically connecting a first voltage recovery device in shunt to the distribution network, detecting a fault condition on the utility power network; and
operating, in response to detecting the fault condition, the first voltage recovery device to transfer reactive power to the utility power network at a level and for a duration to recover the voltage on the utility power network to within a predetermined proportion of the nominal voltage. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A control system for controlling a voltage recovery device, the voltage recovery device electrically coupled to a utility power network including a transmission network for carrying a nominal voltage within a first predetermined voltage range;
- a distribution network, electrically connected to the transmission network, for carrying voltages within a second predetermined voltage range, lower than the first predetermined voltage range, the control system comprising;
a memory including at least a portion for storing a computer program for controlling the voltage recovery device electrically coupled to the distribution network, the stored program including computer-readable instructions which, in response to an indication of a detected fault, provides control signals to the voltage recovery device to control the transfer of reactive power to the distribution network at a level and for a duration to recover the voltage on the transmission network to within a predetermined proportion of the nominal voltage;
a processor to execute the computer-readable instructions; and
a bus connecting the memory to the processor.
- a distribution network, electrically connected to the transmission network, for carrying voltages within a second predetermined voltage range, lower than the first predetermined voltage range, the control system comprising;
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13. A method of stabilizing a utility power network including a utility power network having a transmission network for carrying a nominal voltage within a first predetermined voltage range and a distribution network, electrically connected to the transmission network, for carrying voltages within a second predetermined voltage range, lower than the first predetermined voltage range, the method comprising:
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electrically connecting a plurality of voltage recovery devices to the distribution network, detecting a fault condition on the utility power network; and
operating, in response to detecting the fault condition, one or more of the voltage recovery devices to transfer reactive power to the utility power network at a level and for a duration to recover the voltage on the utility power network to within a predetermined proportion of a nominal voltage. - View Dependent Claims (14, 15, 16)
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17. A utility power network comprising a transmission network for carrying a nominal voltage within a first predetermined voltage range;
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a plurality of distribution networks, each electrically connected to the transmission network, for carrying voltages within a second predetermined voltage range, lower than the first predetermined voltage range, each of the distribution networks coupled to at least one load, and a plurality of voltage recovery devices connected to at least one of the distribution networks, each of the voltage recovery devices configured to provide reactive power to the at least one of the distribution networks at a level and for a duration to recover the voltage on the transmission network to within a predetermined proportion of the nominal voltage, following a fault condition detected on the utility power network. - View Dependent Claims (18, 19, 20)
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Specification