Load filters for medium voltage variable speed drives in electrical submersible pump systems
AssigneeSchlumberger Technology Corporation
InventorsXiaodong Liang, Jeffrey Lim, Rotimi Adedun
Life of this patent
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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 (fr) value within a range from approximately 750 Hz to approximately 1000 Hz according to the equation fr=(2π(LC)0.5)−1. Various other apparatuses, systems, methods, etc., are also disclosed.
Claims20
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 (fr) value within a range from approximately 750 Hz to approximately 1000 Hz according to the equation fr=(2π(LC)0.5)−1.
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.
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.
Dependencies are inferred from the claim text.