Power flow controller responsive to power circulation demand for optimizing power transfer
First Claim
Patent Images
1. A power flow controller, comprising:
- a controller responsive to a circulating power demand;
a first voltage-sourced converter coupled to the controller and adapted to be coupled to a transmission line, the first voltage-sourced converter configured by the controller to control power flow in the transmission line; and
a second voltage-sourced converter coupled to the first voltage-sourced converter via a direct current link and adapted to be coupled to the transmission line, the second voltage-sourced converter configured by the power controller to control power flow in the transmission line,wherein the controller is configured to switch to power circulation set point control between the coupled first and second voltage-sourced converters when at least one of the first voltage-sourced converter and the second voltage-sourced converter is at an operating limit.
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Abstract
A power flow controller responsive to power circulation demand for optimizing power transfer is disclosed. When a power flow controller operates at its rated capacity, it can no longer regulate from-bus voltage set-points, line power flow set-points, or both. In such cases, the power flow controller switches to power circulation set-point control without exceeding the rated capacities of the voltage-sourced converters in the power flow controller. Power-voltage (PV) curves associated with voltage stability analysis for maximizing power transfer can be generated and stored for use with a power flow controller operating in automatic power flow control mode.
36 Citations
22 Claims
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1. A power flow controller, comprising:
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a controller responsive to a circulating power demand; a first voltage-sourced converter coupled to the controller and adapted to be coupled to a transmission line, the first voltage-sourced converter configured by the controller to control power flow in the transmission line; and a second voltage-sourced converter coupled to the first voltage-sourced converter via a direct current link and adapted to be coupled to the transmission line, the second voltage-sourced converter configured by the power controller to control power flow in the transmission line, wherein the controller is configured to switch to power circulation set point control between the coupled first and second voltage-sourced converters when at least one of the first voltage-sourced converter and the second voltage-sourced converter is at an operating limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of controlling power flow in a transmission line using a power flow controller operated at rated capacity, comprising:
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determining if a power flow controller coupled to the transmission line is operating at rated capacity; determining a circulating power demand in response to the power flow controller operating at rated capacity; and configuring the power flow controller based on the circulating power demand to control power flow in the transmission line, wherein the configuring includes setting the power flow controller to include power circulation set point control between at least two coupled voltage-sourced converters if the transmission line is operating at rated capacity. - View Dependent Claims (16, 17, 18)
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19. A computer-readable medium having stored thereon instructions which, when executed by a processor in a power flow control system coupled to a transmission line, causes the processor to perform the operations of:
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determining a desired voltage-stability margin for a bus on the transmission line;
determining a power flow adjustment that will maintain the desired voltage-stability margin on the bus; anddetermining a circulating power demand that will provide the maximum power flow adjustment while maintaining the desired voltage-stability margin on the bus, wherein the determining the circulating power demand includes power circulation set point control between at least two coupled voltage-sourced converters. - View Dependent Claims (20, 21)
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22. A system for controlling power flow in a transmission line using a power flow controller operated at rated capacity, comprising:
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means for determining if a power flow controller coupled to the transmission line is operating at rated capacity; means for determining a circulating power demand in response to the power flow controller operating at rated capacity; and means for configuring the power flow controller based on the circulating power demand to control power flow in the transmission line, wherein the power flow controller is configured to include power circulation set point control between at least two coupled voltage-sourced converters if the transmission line is operating at rated capacity.
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Specification