# US 2013/0278183 A1 · Load filters for medium voltage variable speed drives in electrical submersible pump systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278183 A1 - Document ID: US20130278183A1 - Status: Published application - Kind: A1 - Application number: 13/860,673 - Filed: 2013-04-11 - Published: 2013-10-24 - Earliest claimed: 2012-04-19 - Assignees: Schlumberger Technology Corporation - Applicants: Schlumberger Technology Corporation - Inventors: Xiaodong Liang; Jeffrey Lim; Rotimi Adedun - Web page: https://patentgrep.com/patent/US20130278183A1 ## CPC - G06F 30/367: Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods - H02M 1/126: {using passive filters} - H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## 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. ## Claims ### Claim 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 (fr) value within a range from approximately 750 Hz to approximately 1000 Hz according to the equation fr=(2π(LC)0.5)−1. ### Claim 2 (depends on 1) The medium voltage drive of claim 1 wherein the output of the inverter circuitry outputs a voltage up to approximately 6 kV. ### Claim 3 (depends on 1) The medium voltage drive of claim 1 wherein the output of the inverter circuitry outputs a multi-level pulse-width modulated voltage signal. ### Claim 4 (depends on 3) 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. ### Claim 5 (depends on 1) The medium voltage drive of claim 1 wherein the inductance and capacitance values are approximately 1.6 mH and approximately 20 μF., respectively. ### Claim 6 (depends on 5) The medium voltage drive of claim 5 wherein the resonance frequency value is approximately 890 Hz. ### Claim 7 (depends on 1) The medium voltage drive of claim 1 wherein the inductance and capacitance values are approximately 0.8 mH and approximately 40 μF., respectively. ### Claim 8 (depends on 7) The medium voltage drive of claim 7 wherein the resonance frequency value is approximately 890 Hz. ### Claim 9 (depends on 1) 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. ### Claim 10 (depends on 1) 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 μF to approximately 40 μF. ### Claim 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. ### Claim 12 (depends on 11) 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. ### Claim 13 (depends on 11) 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. ### Claim 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. ### Claim 15 (depends on 14) The system of claim 14 wherein the medium voltage drive is configured to output voltages up to approximately 6 kV. ### Claim 16 (depends on 14) 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 (fr) value within a range from approximately 750 Hz to approximately 1000 Hz according to the equation fr=(2π(LC)0.5)−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 μF to approximately 40 μF. ### Claim 17 (depends on 16) The system of claim 16 wherein the inductance and capacitance values are approximately 1.6 mH and approximately 20 μF., respectively. ### Claim 18 (depends on 17) The system of claim 17 wherein the resonance frequency value is approximately 890 Hz. ### Claim 19 (depends on 16) The system of claim 16 wherein the inductance and capacitance values are approximately 0.8 mH and approximately 40 μF., respectively. ### Claim 20 (depends on 19) The system of claim 19 wherein the resonance frequency value is approximately 890 Hz.