Limiting Peak Electrical Power Drawn by Mining Excavators
8 Assignments
0 Petitions
Accused Products
Abstract
The maximum electrical power drawn from an electrical power source by a mining excavator comprising electric motors is reduced by supplying supplementary electrical power from an electrical energy storage unit. The input electrical power drawn by the mining excavator is cyclic. An upper limit is set for the electrical power drawn from the electrical power source. When the input electrical power drawn by the mining excavator exceeds the upper limit, electrical power is supplied by the electrical energy storage unit, such as an ultracapacitor bank. The ultracapacitor bank may be charged by the electrical power source during off-peak intervals. Electrical power generated by electrical motors operating in a regeneration interval may also be recaptured and stored in the electrical energy storage unit.
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Citations
47 Claims
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1-30. -30. (canceled)
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31. A method for transferring electrical power, the method comprising:
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receiving a first electrical power regenerated from an electrical motor operating during a regeneration interval; converting the first electrical power to a direct-current electrical power; feeding a direct-current link with the direct-current electrical power; and transferring a second electrical power from the direct-current link to electrical power grid. - View Dependent Claims (32, 33, 34)
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35. A method for transferring electrical power, the method comprising:
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receiving a first electrical power regenerated from an electrical motor operating during a regeneration interval; converting the first electrical power to a direct-current electrical power; feeding a direct-current link with the direct-current electrical power; determining a charge of an electrical energy storage unit; upon determining that the charge is less than a user-defined charge limit, transferring a second electrical power from the direct-current link to the electrical energy storage unit; and upon determining that the charge is greater than or equal to the user-defined charge limit, transferring the second electrical power from the direct-current link to an electrical power grid. - View Dependent Claims (36, 37, 38, 39)
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40. A system for transferring electrical power, the system comprising:
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an electrical power conversion system configured to; receive a first electrical power regenerated from an electrical motor operating during a regeneration interval; and convert the first electrical power to a direct-current electrical power; a direct-current link operatively coupled to the electrical power conversion system, wherein the direct-current link is configured to receive the direct-current electrical power; and an active front end operatively coupled to the direct-current link, wherein the active front end is configured to; receive a second electrical power from the direct-current link; convert the second electrical power to an alternating-current electrical power; and transfer the alternating-current electrical power to an electrical power grid. - View Dependent Claims (41, 42)
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43. A system for transferring electrical power, the system comprising:
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an electrical power conversion system configured to; receive a first electrical power regenerated from an electrical motor operating during a regeneration interval; and convert the first electrical power to a direct-current electrical power; a direct-current link operatively coupled to the electrical power conversion system, wherein the direct-current link is configured to receive the direct-current electrical power; an electrical energy storage unit operatively coupled to the direct-current link, wherein the electrical energy storage unit is configured to receive a second electrical power from the direct-current link; and an active front end operatively coupled to the direct-current link, wherein the active front end is configured to; receive a third electrical power from the direct-current link; convert the third electrical power to an alternating-current electrical power; and transfer the alternating-current electrical power to an electrical power grid. - View Dependent Claims (44, 45, 46, 47)
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Specification