LOAD FILTERS FOR MEDIUM VOLTAGE VARIABLE SPEED DRIVES IN ELECTRICAL SUBMERSIBLE PUMP SYSTEMS

• US 20130278183A1
• Filed: 04/11/2013
• Published: 10/24/2013
• Est. Priority Date: 04/19/2012
• Status: Abandoned Application

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Liang, Xiaodong, Lim, Jeffrey, Adedun, Rotimi
• Application Number:
  US13/860,673
• Publication Number:
  US 20130278183A1
• Time in Patent Office: Days
• US Class Current: 318/400.2
• CPC Class Codes: G06F 30/367 Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
• CPC Class Codes: H02M 1/126 using passive filters
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence

Abstract

A medium voltage drive for driving a motor of an electric submersible pump can include inverter circuitry that includes an output for output of power and a load filter connected to the output that includes inductors and capacitors that include inductance (L) and capacitance (C) values that determine a resonance frequency (f_r) value within a range from approximately 750 Hz to approximately 1000 Hz according to the equation f_r=(2π(LC)^0.5)⁻¹. Various other apparatuses, systems, methods, etc., are also disclosed.

Claims

1. A medium voltage drive for driving a motor of an electric submersible pump, the medium voltage drive comprising:

inverter circuitry that comprises an output for output of power; and

a load filter connected to the output that comprises inductors and capacitors that comprise inductance (L) and capacitance (C) values that determine a resonance frequency (f_r) value within a range from approximately 750 Hz to approximately 1000 Hz according to the equation f_r=(2π

(LC)^0.5)<sup>−

1</sup>.

2. The medium voltage drive of claim 1 wherein the output of the inverter circuitry outputs a voltage up to approximately 6 kV.

3. The medium voltage drive of claim 1 wherein the output of the inverter circuitry outputs a multi-level pulse-width modulated voltage signal.

4. The medium voltage drive of claim 3 wherein the inductors and capacitors of the load filter filter the multi-level pulse-width modulated voltage signal to generate a waveform that approximates a sinusoidal waveform.

5. The medium voltage drive of claim 1 wherein the inductance and capacitance values are approximately 1.6 mH and approximately 20 μ

F., respectively.

6. The medium voltage drive of claim 5 wherein the resonance frequency value is approximately 890 Hz.

7. The medium voltage drive of claim 1 wherein the inductance and capacitance values are approximately 0.8 mH and approximately 40 μ

F., respectively.

8. The medium voltage drive of claim 7 wherein the resonance frequency value is approximately 890 Hz.

9. The medium voltage drive of claim 1 wherein the output outputs power signals that comprise a frequency in a range from approximately 0 Hz to approximately 120 Hz.

10. The medium voltage drive of claim 1 wherein the inductance (L) comprises an inductance value in a range from approximately 0.8 mH to approximately 2.2 mH and wherein the capacitance (C) comprises a capacitance value in a range from approximately 20 μ

F to approximately 40 μ

F.

11. A method comprising:

selecting one or more criteria for a resonance frequency;

selecting inductance and capacitance values for a load filter based at least in part on the one or more criteria;

modeling a system that comprises a medium voltage drive, the load filter, cables and an electric submersible pump driven by an electric motor to generate modeling results;

analyzing the modeling results for one or more peak frequencies and for cleanliness of sinusoidal waveforms;

based on the analyzing of the modeling results, deciding if the load filter is acceptable;

altering one or more parameters of the cables;

re-modeling the system with the one or more altered parameters of the cables to generate additional modeling results;

analyzing the additional modeling results for one or more peak frequencies and for cleanliness of sinusoidal waveforms;

based on the analyzing of the additional modeling results, deciding if the load filter is acceptable; and

if the deciding decides that the load filter is acceptable, building the load filter, otherwise repeating at least the selecting inductance and capacitance values to select at least one different inductance or capacitance value.

12. The method of claim 11 wherein the selecting one or more criteria for a resonance frequency comprises selecting a lower limit of approximately 750 Hz and selecting an upper limit of approximately 1000 Hz.

13. The method of claim 11 wherein the analyzing the modeling results for one or more peak frequencies comprises comparing a voltage for one of the one or more peak frequencies to a voltage limit of a physical piece of equipment for use in a system that includes a medium voltage drive, cables and an electric submersible pump driven by an electric motor.

14. A system comprising:

a medium voltage drive that comprises a load filter;

cables that comprise an overall length in a length range of approximately 25 m to approximately 25 km; and

an electric submersible pump that comprises an electric motor,

wherein the load filter maintains output from the medium voltage drive at voltages below rated voltages of the cables and the electric motor.

15. The system of claim 14 wherein the medium voltage drive is configured to output voltages up to approximately 6 kV.

16. The system of claim 14 wherein the load filter comprises inductors and capacitors that comprise inductance (L) and capacitance (C) values that determine a resonance frequency (f_r) value within a range from approximately 750 Hz to approximately 1000 Hz according to the equation f_r=(2π

(LC)^0.5)<sup>−

1</sup> wherein the inductance (L) comprises an inductance value in a range from approximately 0.8 mH to approximately 2.2 mH and wherein the capacitance (C) comprises a capacitance value in a range from approximately 20 μ

F to approximately 40 μ

F.

17. The system of claim 16 wherein the inductance and capacitance values are approximately 1.6 mH and approximately 20 μ

F., respectively.

18. The system of claim 17 wherein the resonance frequency value is approximately 890 Hz.

19. The system of claim 16 wherein the inductance and capacitance values are approximately 0.8 mH and approximately 40 μ

F., respectively.

20. The system of claim 19 wherein the resonance frequency value is approximately 890 Hz.