Dynamic voltage restoration system and method
First Claim
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1. A voltage detection system, for correcting a voltage sag on a power transmission line, comprising:
- data acquisition logic configured to acquire a reference voltage signal generated from a reference voltage produced from the power line;
correction logic configured to (i) determine, based on the reference voltage signal, a correction voltage, (ii) generate, based on the correction voltage, a correction voltage signal, and (iii) communicate to the power line the correction voltage signal such that the correction voltage corrects the voltage sag on the power transmission line;
a shunt transformer comprising a first shunt primary winding, a second shunt primary winding, a third shunt primary winding, a first shunt secondary winding, a second shunt secondary winding, and a third shunt secondary winding, each of the shunt primary windings being in electrical connection with the power transmission line and in electrical connection, at two locations, with remaining shunt primary windings of the first, second, and third shunt primary windings, each of the shunt primary windings receiving the reference voltage, and each of the shunt secondary windings being grounded;
a series transformer comprising a first series primary winding, a second series primary winding, a third series primary winding, a first series secondary winding, a second series secondary winding, and a third series secondary winding, wherein the first series primary winding is in electrical connection with the first shunt secondary winding and ground, the second series primary winding is in electrical connection with the second shunt secondary winding and ground, the third series primary winding is in electrical connection with the third shunt secondary winding and ground, and each of the series secondary windings is in electrical connection with the power transmission line, and each of the secondary windings communicates the correction voltage to the power transmission line; and
a feedback loop between the correction logic and the data acquisition logic, the data acquisition logic being configured to prevent the voltage system from applying the correction voltage on the power line when the voltage sag has recovered.
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Abstract
A system, in one embodiment, includes a voltage fault detection system. The voltage fault detection system may be configured to acquire a reference voltage signal from a power line to determine if a voltage sag condition is present in the power line, determine a correction voltage for correcting the voltage sag condition, use the reference voltage to produce the correction voltage, and apply the correction voltage to the power line.
24 Citations
18 Claims
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1. A voltage detection system, for correcting a voltage sag on a power transmission line, comprising:
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data acquisition logic configured to acquire a reference voltage signal generated from a reference voltage produced from the power line; correction logic configured to (i) determine, based on the reference voltage signal, a correction voltage, (ii) generate, based on the correction voltage, a correction voltage signal, and (iii) communicate to the power line the correction voltage signal such that the correction voltage corrects the voltage sag on the power transmission line; a shunt transformer comprising a first shunt primary winding, a second shunt primary winding, a third shunt primary winding, a first shunt secondary winding, a second shunt secondary winding, and a third shunt secondary winding, each of the shunt primary windings being in electrical connection with the power transmission line and in electrical connection, at two locations, with remaining shunt primary windings of the first, second, and third shunt primary windings, each of the shunt primary windings receiving the reference voltage, and each of the shunt secondary windings being grounded; a series transformer comprising a first series primary winding, a second series primary winding, a third series primary winding, a first series secondary winding, a second series secondary winding, and a third series secondary winding, wherein the first series primary winding is in electrical connection with the first shunt secondary winding and ground, the second series primary winding is in electrical connection with the second shunt secondary winding and ground, the third series primary winding is in electrical connection with the third shunt secondary winding and ground, and each of the series secondary windings is in electrical connection with the power transmission line, and each of the secondary windings communicates the correction voltage to the power transmission line; and a feedback loop between the correction logic and the data acquisition logic, the data acquisition logic being configured to prevent the voltage system from applying the correction voltage on the power line when the voltage sag has recovered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power system comprising:
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a power transmission path; a reference transmission path; and a control system coupled to the power transmission path and configured to correct a voltage sag in the power transmission path, wherein the control system includes; a data acquisition unit configured to acquire a voltage in the power transmission path as a reference voltage signal; a correction unit configured to receive the reference voltage signal from the data acquisition unit, compare the reference voltage signal with a target voltage, and determine a required correction voltage based on a difference between the target voltage and the reference voltage signal; shunt transformer circuity comprising a first shunt primary winding, a second shunt primary winding, a third shunt primary winding, a first shunt secondary winding, a second shunt secondary winding, and a third shunt secondary winding, each of the shunt primary windings being in electrical connection with the reference transmission path and in electrical connection, at two locations, with remaining shunt primary windings of the first, second, and third shunt primary windings, each of the shunt primary windings receiving the reference voltage, and each of the shunt secondary windings being grounded; series transformer circuitry comprising a first series primary winding, a second series primary winding, a third series primary winding, a first series secondary winding, a second series secondary winding, and a third series secondary winding, wherein the first series primary winding is in electrical connection with the first shunt secondary winding and ground, the second series primary winding is in electrical connection with the second shunt secondary winding and ground, the third series primary winding is in electrical connection with the third shunt secondary winding and ground, and each of the series secondary windings is in electrical connection with the power transmission path, each of the secondary windings communicating the correction voltage to the power transmission path; and a feedback loop between the correction unit and the data acquisition unit, the data acquisition unit configured to prevent the power system from applying the correction voltage on the power transmission path when the voltage sag has recovered. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A circuit, for correcting a voltage sag on a power transmission line, the circuit comprising:
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data acquisition circuitry receiving a reference voltage from the power transmission line; correction circuitry comprising a shunt transformer including a first shunt primary winding, a second shunt primary winding, a third shunt primary winding, a first shunt secondary winding, a second shunt secondary winding, and a third shunt secondary winding, each of the shunt primary windings being in electrical connection with the power transmission line and in electrical connection, at two locations, with remaining shunt primary windings of the first, second, and third shunt primary windings, each of the shunt secondary windings being in electrical connection with a corresponding first series primary winding, second series primary winding, and third series primary winding of a series transformer, each of the shunt secondary windings and each of the series primary windings being grounded, the correction circuitry configured to perform operations comprising; determining a correction voltage based on the reference voltage; and controlling a first operation of the shunt transformer generating an output voltage that corresponds to the correction voltage, wherein the output voltage is provided to a second transformer applying the output voltage to the power line; and a feedback loop between the correction circuitry and the data acquisition circuitry, the data acquisition circuitry preventing the correction circuitry from applying the correction voltage on the power line when the voltage sag has recovered. - View Dependent Claims (18)
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Specification