Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area. The method includes determining a
Provided is an apparatus and method for providing a voltage reduction for single-phase voltage regulator operation in a three-phase power system. The voltage regulator includes a plurality of tap positions selectable to adjust a voltage at a load to an in-band area. The method includes determining a measured voltage and current at the voltage regulator, determining a line voltage drop between the voltage regulator and the load if the measured voltage in the OOB area above the in-band area, and utilizing the measured voltage to lower the voltage at the load if there are no available taps. The method also includes utilizing the measured voltage less the line voltage drop to determine the tap change if there are available taps.
대표청구항▼
What is claimed is: 1. An apparatus for providing a voltage adjustment for single-phase voltage regulator operation of a voltage regulator operatively coupled to a single-phase distribution line of a three-phase power system, the voltage regulator including a plurality of taps selectable to adjust
What is claimed is: 1. An apparatus for providing a voltage adjustment for single-phase voltage regulator operation of a voltage regulator operatively coupled to a single-phase distribution line of a three-phase power system, the voltage regulator including a plurality of taps selectable to adjust a voltage at a load of the single-phase distribution line to an in-band area, the apparatus comprising: a means for deriving a digitized voltage signal and a digitized current signal of the single-phase distribution line at the voltage regulator; and a microcontroller operatively coupled to the means for deriving, the microcontroller including a microprocessor and a memory operatively coupled to the microprocessor, the microcontroller being programmed to: determine a measured voltage and a measured current at the voltage regulator based on respective digitized voltage and current signals, determine a line voltage drop between the voltage regulator and the load if the measured voltage is in an out-of-band area above the in-band area, and if there are no available taps of the plurality of taps and the measured voltage is in the out-of-band area above the in-band area, utilize the measured voltage to adjust the voltage at the load. 2. The apparatus of claim 1, wherein utilization of the measured voltage bypasses an effect of the line voltage drop on the adjustment of the voltage at the load to yield a voltage reduction for single-phase voltage regulator operation of the voltage regulator. 3. The apparatus of claim 1, wherein the microcontroller is further programmed to lower a reference voltage defining the in-band area. 4. The apparatus of claim 1, wherein if there are no available taps and the measured voltage is in an out-of-band area below the in-band area, the microcontroller is further programmed to utilize the measured voltage plus a reduction voltage to adjust the voltage at the load. 5. The apparatus of claim 4, wherein the reduction voltage comprises a percentage of a center-band voltage of the in-band area. 6. The apparatus of claim 4, wherein utilization of the measured voltage plus the reduction voltage yields a voltage reduction for single-phase voltage regulator operation of the voltage regulator. 7. The apparatus of claim 1, wherein if there are available taps, the microcontroller is further programmed to utilize the measured voltage less the line voltage drop to determine a tap change of the plurality of taps when the measured voltage is in the out-of-band area above the in-band area. 8. The apparatus of claim 1, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a total current, wherein the total current is equal to a quotient of the measured voltage at the voltage regulator and a total impedance, and wherein the total impedance is equal to a sum of the line impedance and an impedance of the load. 9. The apparatus of claim 8, wherein the impedance of the load is transmitted to the microcontroller. 10. The apparatus of claim 1, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and the measured current, and wherein the measured current is about equal to a total current at the voltage regulator. 11. The apparatus of claim 1, wherein the in-band area is adjustable between a first voltage value and a second voltage value. 12. An apparatus for providing a voltage adjustment for single-phase voltage regulator operation of a voltage regulator operatively coupled to a single-phase distribution line of a three-phase power system, the voltage regulator including a plurality of taps selectable to adjust a voltage at a load of the single-phase distribution line to an in-band area, the apparatus comprising: a means for deriving a digitized voltage signal and a digitized current signal of the single-phase distribution line at the voltage regulator; and a microcontroller operatively coupled to the means for deriving, the microcontroller including a microprocessor and a memory operatively coupled to the microprocessor, the microcontroller being programmed to: determine a measured voltage and a measured current at the voltage regulator based on the respective digitized voltage and current signals, determine a line voltage drop between the voltage regulator and the load if the measured voltage is in the out-of-band area above the in-band area, divide the line voltage drop by a tap voltage value of a single tap of the plurality of taps to form a required taps value, and if the required taps value is greater than a number of available taps of the plurality of taps, utilize the measured voltage less another line voltage drop to adjust the voltage at the load, the another line drop voltage less than the line drop voltage and based on the required taps value. 13. The apparatus of claim 12, wherein utilization of the measured voltage less the another line voltage drop reduces an effect of the line voltage drop on the adjustment of the voltage at the load to yield a voltage reduction for single-phase voltage regulator operation of the voltage regulator. 14. The apparatus of claim 12, wherein the microcontroller is further programmed to: divide the number of available taps by the required taps value to form a line drop compensation adjustment value; multiply a line impedance of the single-phase distribution line by the line drop compensation adjustment value to form another line impedance; and multiply the another line impedance by a total current of the single-phase distribution line to calculate the another line voltage drop. 15. The apparatus of claim 12, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a measured current, and wherein the measured current is about equal to a total current at the voltage regulator. 16. The apparatus of claim 12, wherein the line voltage drop is equal to a product of the line impedance and the total current, wherein the total current is equal to a quotient of the measured voltage at the voltage regulator and a total impedance, and wherein the total impedance is equal to a sum of the line impedance and an impedance of the load. 17. The apparatus of claim 16, wherein the impedance of the load is transmitted to the microcontroller. 18. The apparatus of claim 12, wherein the microcontroller is further programmed to lower a reference voltage defining the in-band area. 19. The apparatus of claim 12, wherein if there are no available taps and the measured voltage is in an out-of-band area below the in-band area, the microcontroller is further programmed to utilize the measured voltage plus a reduction voltage to adjust the voltage at the load. 20. The apparatus of claim 19, wherein the reduction voltage comprises a percentage of a center-band voltage of the in-band area. 21. The apparatus of claim 12, wherein the in-band area is adjustable between a first voltage value and a second voltage value. 22. A method for providing a voltage adjustment for single-phase voltage regulator operation of a voltage regulator operatively coupled to a single-phase distribution line of a three-phase power system, the voltage regulator including a plurality of taps selectable to adjust a voltage at a load of the single-phase distribution line to an in-band area, the method comprising: determining a measured voltage and a measured current at the voltage regulator based on a respective digitized voltage signal and a digitized current signal of the single-phase distribution line at the voltage regulator; and if there are no available taps of the plurality of taps and the measured voltage is in the out-of-band area above the in-band area, eliminating an effect of a line voltage drop between the voltage regulator and the load to adjust the voltage at the load. 23. The method of claim 22, wherein the measured voltage is utilized to adjust the voltage at the load, the adjustment yielding a voltage reduction for single-phase voltage regulator operation of the voltage regulator. 24. The method of claim 22, further comprising lowering a reference voltage defining the in-band area. 25. The method of claim 22, further comprising utilizing the measured voltage plus a reduction voltage to adjust the voltage at the load if there are no available taps and the measured voltage is in an out-of-band area below the in-band area. 26. The method of claim 25, wherein the reduction voltage comprises a percentage of a center-band voltage of the in-band area. 27. The method of claim 25, wherein utilization of the measured voltage plus the reduction voltage yields a voltage reduction for single-phase voltage regulator operation of the voltage regulator. 28. The method of claim 22, further comprising utilizing the measured voltage less the line voltage drop to determine a tap change of the plurality of taps if the measured voltage is in the out-of-band area above the in-band area and if there are available taps. 29. The method of claim 22, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a total current, wherein the total current is equal to a quotient of the measured voltage at the voltage regulator and a total impedance, and wherein the total impedance is equal to a sum of the line impedance and an impedance of the load. 30. The method of claim 29, wherein the impedance of the load is transmitted to a microcontroller. 31. The method of claim 22, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a measured current, and wherein the measured current is about equal to a total current at the voltage regulator. 32. The method of claim 22, wherein the in-band area is adjustable between a first voltage value and a second voltage value. 33. A method for providing a voltage adjustment for single-phase voltage regulator operation of a voltage regulator operatively coupled to a single-phase distribution line of a three-phase power system, the voltage regulator including a plurality of taps selectable to adjust a voltage at a load of the single-phase distribution line to an in-band area, the method comprising: determining a measured voltage and a measured current at the voltage regulator based on a respective digitized voltage signal and a digitized current signal of the single-phase distribution line at the voltage regulator; determining a line voltage drop between the voltage regulator and the load if the measured voltage is in an out-of-band area above the in-band area; and if there are no available taps of the plurality of taps, reducing an effect of the line voltage drop to adjust the voltage at the load. 34. The method of claim 33, wherein reducing the effect of the line voltage drop comprises: dividing the line voltage drop by a tap voltage value of a single tap of the plurality of taps to form a required taps value; and if the required taps value is greater than a number of available taps of the plurality of taps, utilizing the measured voltage less another line voltage drop to adjust the voltage at the load when the measured voltage is in the out-of-band area, the another line drop voltage less than the line drop voltage and based on the required taps value. 35. The method of claim 34, further comprising: dividing the number of available taps by the required taps value to form a line drop compensation adjustment value; multiplying a line impedance of the single-phase distribution line by the line drop compensation adjustment value to form another line impedance; and multiplying the another line impedance by a total current of the single-phase distribution line to calculate the another line voltage drop. 36. The method of claim 34, wherein utilization of the measured voltage less the another line voltage drop reduces an effect of the line voltage drop on the adjustment of the voltage at the load to yield a voltage reduction for single-phase voltage regulator operation of the voltage regulator. 37. The method of claim 33, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a measured current, and wherein the measured current is about equal to a total current at the voltage regulator. 38. The method of claim 33, wherein the line voltage drop is equal to a product of the line impedance and the total current, wherein the total current is equal to a quotient of the measured voltage at the voltage regulator and a total impedance, and wherein the total impedance is equal to a sum of the line impedance and an impedance of the load. 39. The method of claim 38, wherein the impedance of the load is transmitted to the microcontroller. 40. The method of claim 33, further comprising lowering a reference voltage defining the in-band area. 41. The method of claim 33, wherein the in-band area is adjustable between a first voltage value and a second voltage value. 42. A method for providing a voltage reduction for single-phase voltage regulator operation of a voltage regulator operatively coupled to a single-phase distribution line of a three-phase power system, the voltage regulator including a plurality of taps selectable to adjust a voltage at a load of the single-phase distribution line from an out-of-band area above an in-band area to the in-band area, the method comprising: determining a measured voltage and a measured current at the voltage regulator based on a respective digitized voltage signal and a digitized current signal of the single-phase distribution line at the voltage regulator; determining a line voltage drop between the voltage regulator and the load if the measured voltage is in the out-of-band area; if there are no available taps of the plurality of taps, utilizing the measured voltage to lower the voltage at the load when the measured voltage is in the out-of-band area; and if there are available taps, utilizing the measured voltage less the line voltage drop to determine the tap change when the measured voltage is in the out-of-band area. 43. The method of claim 42, wherein utilization of only the measured voltage bypasses an effect of the line voltage drop to yield the voltage reduction for single-phase voltage regulator operation of the voltage regulator. 44. The method of claim 43, further comprising lowering a reference voltage defining the in-band area. 45. The method of claim 42, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a total current, wherein the total current is equal to a quotient of the measured voltage at the voltage regulator and a total impedance, and wherein the total impedance is equal to a sum of the line impedance and an impedance of the load. 46. The method of claim 42, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a measured current, and wherein the measured current is about equal to a total current at the voltage regulator. 47. A method for providing an incremental voltage reduction for single-phase voltage regulator operation of a voltage regulator operatively coupled to a single-phase distribution line of a three-phase power system, the voltage regulator including a plurality of taps selectable to adjust a voltage at a load of the single-phase distribution line from an out-of-band area above an in-band area to the in-band area, the method comprising: determining a measured voltage and a measured current at the voltage regulator based on a respective digitized voltage signal and a digitized current signal of the single-phase distribution line at the voltage regulator; if the measured voltage is in the out-of-band area: determining a line voltage drop between the voltage regulator and the load; dividing the line voltage drop by a tap voltage value of a single tap of the plurality of taps to form a required taps value; and if the required taps value is greater than a number of available taps of the plurality of taps, incrementally reducing an effect of the line voltage drop to reduce the voltage at the load from the out-of-band area to the in-band area. 48. The method of claim 47, wherein the line voltage drop is equal to a product of a line impedance of the single-phase distribution line and a measured current, and wherein the measured current is about equal to a total current at the voltage regulator. 49. The method of claim 47, wherein the line voltage drop is equal to a product of the line impedance and the total current, wherein the total current is equal to a quotient of the measured voltage at the voltage regulator and a total impedance, and wherein the total impedance is equal to a sum of the line impedance and an impedance of the load. 50. The method of claim 47, further comprising the incremental voltage reduction for single-phase voltage regulator operation upon incrementally reducing the effect of the line voltage drop. 51. The method of claim 50, further comprising lowering the reference voltage of the in-band area. 52. The method of claim 47, wherein the tap change adjusts the voltage at the load.
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