SOLAR DRIVE CONTROL SYSTEM FOR OIL PUMP JACKS

Abstract

A system for supplementing the electric power needed by a pump jack electric motor, thereby reducing the electric power purchased from the local utility or power supplier. The system comprises a solar photovoltaic system, or other forms of renewable energy, and regenerated power from the electric motor or drive. The system can be both “on-grid” and “off-grid.” Battery banks and capacitor banks may be used to store and provide energy.

Claims

1. An apparatus, comprising: a variable frequency drive with a regeneration unit for regenerating energy from a pump jack; and a capacitor bank for storing regenerated energy from and supplying energy to said pump jack.

2. The apparatus of claim 1, further comprising a renewable power source in electric communication with the variable frequency drive, wherein some or all of the energy required to operate the pump jack is obtained from the renewable power source.

3. The apparatus of claim 2, wherein the renewable power source is connected directly to a common DC buss on the regeneration unit.

4. The apparatus of claim 1, wherein the apparatus is connected to a utility power grid.

5. The apparatus of claim 1, wherein further comprising a battery bank.

6. The apparatus of claim 2, wherein the renewable power source comprises one or more solar panels.

7. The apparatus of claim 2, wherein the renewable power source comprises one or more wind turbines.

8. The apparatus of claim 2, wherein the renewable power source comprises one or more hydro-electric generators.

9. The apparatus of claim 2, wherein the renewable power source comprises a combination of one or more solar panels, wind turbines, or hydro-electric generators.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 shows a view of a system in accordance with an embodiment of the present invention.

[0009] FIG. 2 shows a view of a system with direct connection between the solar array and the regenerative unit of the variable speed drive.

[0010] FIG. 3 shows a view of an “off-grid” system.

[0011] FIG. 4 shows a view of a system with a variable frequency/speed drive connected to a capacitor.

[0012] FIG. 5 shows a view of a system with a variable frequency/speed drive connected to a solar array and capacitor.

[0013] FIG. 6 shows a view of a system with a variable frequency/speed drive connected to an alternative energy source and capacitor.

[0014] FIG. 7 shows a detailed view of a capacitor and wiring board.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0015] In various exemplary embodiments, the present invention comprises a system for supplementing the electric power needed by a pump jack electric motor, thereby reducing the electric power purchased from the local utility or power supplier. In one embodiment, the system comprises a solar photovoltaic system and regenerated power from the electric motor or drive. The system can be both “on-grid” and “off-grid.”

[0016] In an “on-grid” embodiment, as seen in FIG. 1, the system allows for a balanced connection between the utility power grid 100 and a solar photovoltaic system 10 through the DC buss of a regenerative variable frequency drive (VFD), also referred to by several other terms, including, but not limited to, variable speed drive, variable speed controller, or similar terms 200. In general, the power required to operate the pump jack motor or drive is provided by the solar photovoltaic system 10 and by the energy from the regenerative action from the operation of the pump jack on the electric motor. Any additional power required to operate the pump jack motor may come from the utility power grid 100. Any excess power may be sold back to the local utility via a “net meter” agreement or similar arrangement.

[0017] As seen in FIG. 1, in one embodiment the solar photovoltaic system comprises an array of solar panels 12 (with kW output sized by load), connected through individual solar inverters 14 (which, in the embodiment shown, converts 24V DC to 240V AC) to a transformer 16, which in turn is connected to the power distribution box 18. In this embodiment, the transformer converts 240V AC to 480V AC single phase. The power distribution box is connected to the power grid 100 through a meter 102. The VFD with front-end regenerative unit controls the speed of the motor, and is grid tied to the invertor for the solar array system converting 480V AC single phase to 480V three phase. The regenerative unit may be integrated with the VFD, or may be a separate unit connected thereto.

[0018] As seen in FIG. 2, the solar photovoltaic system 10 may be connected directly to the common DC buss on the regenerative VFD 200, which allows the regenerative drive to convert energy produced by the solar photovoltaic system (which is DC energy) to synchronized 3-phase waveforms. This is the utility-required format for energy passed from the system to the utility grid. In the embodiment shown, a second transformer 22 is added (in this embodiment, converting 240V AC to 480 V AC), and is connected to inverter 202, which inverts 480V AC single phase to 650V DC, thereby tying the energy from the solar panel array directly to the VFD 200.

[0019] In several embodiments, the regenerative capabilities of the drive must meet or exceed all utility requirements for power filtering and harmonic issues that are required for direct connection of the drive to the utility with respect to the driver supplying power back to the utility. The regenerative drive must meet or exceed all utility requirements concerning direct interconnection guidelines for small generator interconnect agreements.

[0020] For both of the above examples, the parameters for the VFD may be adjusted to increase the amount of regenerated energy and optimize the power usage of the pump jack.

[0021] While the above discussion was in the context of solar power, other forms of renewable energy sources may be used, including, but not limited to, wind and hydro-electric. These may be used separately, or in combination.

[0022] In an “off-grid” embodiment with combined renewable energy sources, as seen in FIG. 3, the system captures and/or reuses the power generated from a solar photovoltaic array 10, an optional wind turbine or wind turbine array 20, as well as the regenerated power from the pump jack drive. Regenerative power from the pump jack drive may be stored in a DC capacitor bank (in this example, 48V) 40, and fed back into the DC buss of the variable frequency drive 200. The solar and wind energy are directed through a DC battery charger 32 (with size determined by the amount of energy generated by the solar array and wind turbine; in this example, 48V DC), and may be stored in a DC battery bank (in this example, 48V DC) 30. In one embodiment, the batteries may be lithium ion or lead acid batteries, and sized based on expected loads.

[0023] The capacitor bank is the storage bank for regenerated power from the motor, and allows the regenerated power to be stored and reused. In one embodiment, the bank comprises nickel oxide hydroxide high amperage capacitors.

[0024] Energy needed to run the pump jack motor is pulled from the capacitor bank 40, with additional energy as needed pulled from the battery bank 30, through a DC interconnection box 44. The interconnection box allows for level flow of DC power back to the capacitor bank, but stopping any reverse flow to the battery bank. The interconnection box is connected to inverter 202, which inverts 480V AC single phase to 650V DC (as described above for the direct connection embodiment).

[0025] In another embodiment where the system is connected to the power grid as well, the power grid also may be a source of energy to make up any difference. The battery bank and capacitor bank are sized by the load needed to operate the respective pump jack drive or motor. The VFD 200 controls the speed of the motor, and acts as inverter for on-grid and off-grid configurations.

[0026] In several embodiments, a capacitor or capacitor bank 40 (as seen in FIG. 7), may be used in direct connection with a VFD 200 (see FIG. 4), in connection with a solar array 10 and a VFD 200 (see FIG. 5), or in connection with one or more alternative energy sources 50 (including, but not limited to, wind, hydro, solar, geothermal, or the like) and a VFD 200 (see FIG. 6).

[0027] Thus, it should be understood that the embodiments and examples described herein have been chosen and described in order to best illustrate the principles of the invention and its practical applications to thereby enable one of ordinary skill in the art to best utilize the invention in various embodiments and with various modifications as are suited for particular uses contemplated. Even though specific embodiments of this invention have been described, they are not to be taken as exhaustive. There are several variations that will be apparent to those skilled in the art.