CN105577054B - A kind of offshore oilfield electric submersible pump electric power system - Google Patents
A kind of offshore oilfield electric submersible pump electric power system Download PDFInfo
- Publication number
- CN105577054B CN105577054B CN201610029188.1A CN201610029188A CN105577054B CN 105577054 B CN105577054 B CN 105577054B CN 201610029188 A CN201610029188 A CN 201610029188A CN 105577054 B CN105577054 B CN 105577054B
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- Prior art keywords
- submersible pump
- frequency
- electric submersible
- frequency converter
- electric
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/36—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using armature-reaction-excited machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
Abstract
The present invention relates to a kind of offshore oilfield electric submersible pump electric power systems, the offshore oilfield electric submersible pump electric power system includes power supply, frequency converter, wave filter, motor, Synchronous generator, step-up transformer, long cable, electric submersible pump, detection unit, controller, this is the power supply scheme of a kind of " frequency converter-motor-synchronous generator-cable-electric submersible pump ", this offshore oilfield electric submersible pump electric power system is compared with " frequency converter-cable-electric submersible pump " powering mode of the prior art, system design is simple in structure, at low cost, control validity is better than the prior art.
Description
Technical field
The present invention relates to a kind of electric power systems, and in particular to a kind of offshore oilfield electric submersible pump electric power system.
Background technology
Oil field at sea, in order to improve the benefit of oil-immersed pump, it is necessary to carry out change frequency modulation according to latent oil pump load situation of change
Speed, therefore, it is necessary to attached with frequency converters.In this way, there are three types of types for the electric power thus supplied of electric submersible pump.Electric immersible pump for oil extraction（I.e.：Motor+
Oil-immersed pump）First type power supply mode, conventional distance power supply（Power supply distance is less than 50Km）, maximum supply power voltage 36Kv, list
Cable capacity 50Kva, cable length installs transformer additional when being more than 20Km, but frequency converter is installed at cable head-end；Second of type supplies
Electrically, power over long distances（Power supply distance is less than 200Km）, maximum supply power voltage 140Kv, single cable capacity 200Kva, frequency converter
It is installed at cable end piece；The third type power supply mode, extra long distance power supply（Power supply distance is more than 200Km）, exchange maximum pass
Defeated capacity 50Kva, voltage fluctuation is big, so should use, direct current transportation mode is effective, and frequency converter is still installed at cable end piece.
Since frequency converter contains PWM inversion links, so harmonic wave and pulse will be generated in operation, due to submarine cable
The mismatch of very long load impedance in addition and cable resistance, harmonic wave and pulse will reflect and cause cable end piece overvoltage, danger
The safety of electric cable and machine winding.For second and the third type power supply mode, due to frequency converter and submersible motor distance
Relatively near, there is no security risks.For the first type electric power system, generally all using " frequency converter-cable-electric submersible pump "
Power supply structure, abbreviation IEESP electric power systems, as shown in Figure 1.The electric power system mainly by frequency converter, wave filter, cable,
The compositions such as electric submersible pump, outstanding problem existing for the system are：
First, harmonic wave reflection.Harmonic wave is extremely serious, and the number of major harmonic, harmonic current content are complicated, and long cable can
Forming LCR circuits makes the easy resonance of circuit system, in addition the higher hamonic wave that frequency converter power electronic devices generates is to motor and cable
Insulation generates very big harm, when being superimposed with time-harmonic wave generation transmitted wave with long range motor side emitting voltage, submersible motor end electricity
Pressure value voltage value has increase effect, and result causes submersible motor terminal voltage excessive, easily damages cable and latent oil electricity
Machine winding insulation.Latent oil pump frequency conversion needs speed governing, and inverter supply output frequency operating point is not fixed, and it is each to correspond to frequency converter
The dot frequency that works is all there are many harmonic wave, so harmonic wave is distributed in very wide frequency domain, in this way, even if performance good wave filter again
All harmonic waves under all secondary frequencies cannot be effectively filtered out.Further, since harmonic wave exists, when the long cable power supply of frequency converter, make
It is unstable into supply voltage electric current, it is impossible to the effectively operating mode of control load.Equally, power in this way, frequency converter is come
Say it must is high voltage converter, make frequency converter and wave filter cost excessively high.
Second, the reflection of frequency converter pwm pulse.The characteristic impedance of the characteristic impedance of long transmission cable and electric submersible pump load mismatches
Cause submersible motor end pulse voltage excessive, rising edge of a pulse and falling edge are happened at the time of voltage is excessive, is easily damaged
Cable and submersible motor winding insulation.
3rd, harmonic wave control problem -- " harmonic wave beats mole " phenomenon.Increasingly complex is harmonic wave control in the presence of " harmonic wave beats mole
Mouse " phenomenon, i.e.,：Certain frequency harmonics is suppressed, and another frequency harmonics are reinforced again, can not be effected a radical cure.Such puzzlement one
It is directly the problem of frequency converter and the power supply of long transmission cable field.
4th, impulse wave governing problem -- " impulse wave beats mole " phenomenon.Research shows that impulse wave administers most effective side
Method is to install wave filter additional in load end, and offshore oilfield electric submersible pump wave filter installation cost is excessively high.In addition, to administer harmonic wave,
It is to select well to install active filter additional, and the principle of active filter is to administer harmonic wave using pwm pulse ripple, and always and harmonic wave
Hysteresis theoretically generates more impulse waves again.Therefore, harmonic wave control generates " impulse wave beats mole " phenomenon again.
In conclusion for the first power supply mode, wave filter can only filter out fractional harmonic, there is also and various " beat mole
Mouse " phenomenon, in this way, can only passively bear that Keep Clear-High Voltage quietly for harmonic wave and impulse wave cable and submersible motor winding, technology
Upper " being willing and yet unable to help ", dielectric level is subject to serious challenge.Therefore, electric voltage frequency is controllable and the electric power system pattern without harmonic wave is
Offshore oilfield is significantly expected.
The content of the invention
For technical problem in the prior art, the present invention provides a kind of offshore oilfield electric submersible pump electric power system,
The electric power system is connected and composed by frequency converter, wave filter, motor, generator, cable, electric submersible pump, forms collection power electronics
The advantages of technology, generator powered power generation captain's cable powering supplying pattern, system design is simple in structure, cost
Low, control validity is better than the prior art.
To achieve these goals, the present invention adopts the following technical scheme that.
A kind of offshore oilfield electric submersible pump electric power system including power supply, further includes frequency converter, wave filter, motor, synchronous hair
Motor group, step-up transformer, long cable, electric submersible pump, detection unit, controller, wherein：
Direct current is become the adjustable transformer frequency conversion ac source of frequency and voltage by the frequency converter；
The wave filter is connected with frequency converter, and the wave filter is used for filtering out the transformer frequency conversion ac from frequency converter
Harmonic wave and impulse wave in source；
The motor is connected by wave filter with frequency converter, the motor be under the driving of frequency converter generate with
Enough mechanical outputs of the corresponding rotating speed of transformer frequency conversion ac source frequency or torque drive Synchronous generator；
The Synchronous generator is connected with motor, and the Synchronous generator is generated under the driving of motor
With frequency converter with frequency, by adjust excitation system generate according to transformer frequency conversion ac of the frequency converter voltage frequency than same pressure
Source；
The step-up transformer connecting detection unit and by long cable connection electric submersible pump, the step-up transformer is for full
Voltage needed for sufficient electric submersible pump；
The long cable connection electric submersible pump and transformer, the variable voltage variable frequency that the long cable transfer meets electric submersible pump requirement are handed over
Galvanic electricity source；
The electric submersible pump provides machine power to meet oil well output demand；
The detection unit connects motor, and the detection unit detects parameters of electric power, to monitor oil extraction system service；
The controller is connected with frequency converter, power supply, detection unit, and the controller is used to monitor oil extraction system；
The controller includes DSP control system one, DSP control system two, DSP control system three and load-side control system
System, for controlling frequency converter, the DSP control system two is used to control Synchronous generator excitation the DSP control system one,
For monitoring transmission of electricity parameter, the load-side control system is used to detect electric submersible pump parameter the DSP control system three；
The electric submersible pump is load starting state, and frequency converter is according to the requirement of long cut cable electric submersible pump load startup, frequency conversion
Motor is started, the Synchronous generator of shaft coupling is driven to work, sends the three-phase alternating current of assigned frequency, by adjusting excitation system
System is generated according to transformation alternating current of the frequency converter voltage frequency than same pressure, is obtained transformer frequency conversion ac source after synthesis control, is passed through
Step-up transformer boosts, and supplying electric submersible pump by long cable loads.
Preferably, the wave filter is sine wave filter.
In any of the above-described technical solution preferably, the frequency converter is according to the Synchronous generator three-phase alternating current of detection
Electric frequency, voltage, electric current and harmonic content by its control algolithm and accurately direct torque, make Synchronous generator defeated
Go out frequency stabilization, the higher three-phase alternating current of power quality.
In any of the above-described technical solution preferably, the power supply is intelligent power；The intelligent power is according to detection
Synchronous generator three-phase alternating current voltage value and synchronous machine Closed-loop Excitation control adjustment its output three-phase electricity pressure amplitude
Value makes Synchronous generator output stablize suitable three-phase voltage value.
In any of the above-described technical solution preferably, which requires according to the load variation of long cable distal end, with
And load current situation of change, it is instructed according to its frequency control, the control adjustment required phase of Synchronous generator output loading
Matched three-phase alternating current.
In any of the above-described technical solution preferably, the electric power system also with long cable load end control system into line number
According to exchange, according to the actual condition that electric submersible pump loads, the three phase variable frequency transformation alternating current of adjustment Synchronous generator output is realized
Optimum control.
A kind of new solution party proposed the present invention be directed to the problems of current offshore oilfield electric submersible pump power supply
Case.The present invention relates to a kind of power supply for being based on " frequency converter-cable-electric submersible pump " of offshore oilfield, more particularly to sea
The power supply of oil field one kind " frequency converter-motor-synchronous generator-cable-electric submersible pump ".The offshore oilfield of the present invention
Electric submersible pump electric power system is mainly made of frequency converter, wave filter, motor, generator, cable, electric submersible pump etc..I.e.：Frequency converter-
The power supply scheme of motor-synchronous generator-cable-electric submersible pump, abbreviation IMGEESP electric power systems.The present invention provides
This advantages of integrating Power Electronic Technique, generator powered power generation captain's cable powering supplying pattern, the power supply
The power supply of pattern have it is of low cost, ingenious in design, particularly harmonic content it is low, without frequency converter impulse disturbances, control effectively etc.
Advantage.
Compared with prior art frequency converter-cable-electric submersible pump powering mode, offshore oilfield electric submersible pump of the invention power supply
The advantages of system, i.e. IMGEESP electric power systems, is：
1st, due in having traditional " frequency converter-cable-electric submersible pump powering mode ", adding in " motor-generator "
Bi-motor link, it is obvious that the link isolated frequency converter generation harmonic wave, make cable run harmonic content low or substantially without
Harmonic wave；
2nd, due to being transmitted electricity using " motor-generator-cable " to the other end, which has isolated frequency converter generation
PWM electric pulses, i.e.,：No frequency converter pwm pulse interference, in this way, being just not present various due to frequency converter pwm pulse interference fringe
Complex working condition asks pointed peaky pulse, improves long cable and submersible motor service life.
Description of the drawings
Fig. 1 is a kind of " frequency converter-cable-electric submersible pump " electric power system structure diagram of the prior art；
Fig. 2 is the " frequency converter-electronic of a preferred embodiment of offshore oilfield electric submersible pump electric power system according to the invention
Machine-synchronous generator-cable-electric submersible pump " electric power system structure diagram.
Specific embodiment
It elaborates, is described below only as demonstration reconciliation to the present invention with reference to the accompanying drawings and detailed description
It releases, does not make limitation in any form to the present invention.
As shown in Fig. 2, offshore oilfield electric submersible pump electric power system is by power supply, frequency converter, wave filter, motor, synchronous generator
Unit, step-up transformer, long cable, electric submersible pump, detection unit, controller connect and compose, this is for current offshore oilfield electricity
A kind of latent new solution for pumping the problems of power supply and proposing.This offshore oilfield electric submersible pump electric power system is related to sea
A kind of power supply for being based on " frequency converter-cable-electric submersible pump " in upper oil field, more particularly to a kind of " frequency conversion of offshore oilfield
The power supply of device-motor-synchronous generator-cable-electric submersible pump ", i.e.,：Frequency converter-motor-synchronous generator
The power supply scheme of machine-cable-electric submersible pump, abbreviation IMGEESP electric power systems, this power generation captain's cable powering supplying mould
Formula, it is of low cost, ingenious in design, particularly harmonic content it is low, without frequency converter impulse disturbances, control it is effective the advantages that.
The specific composition of this offshore oilfield electric submersible pump electric power system and each component connection relation are as shown in Figure 2：
It is that direct current is become the adjustable change of frequency and voltage that frequency converter, which connects wave filter and controller, the function of frequency converter,
Press variable frequency alternating current power source.Frequency converter includes rectifier and multi-electrical level inverter, and rectifier is connected with multi-electrical level inverter, mostly electric
Flat inverter is connected with controller.Frequency converter is according to the Synchronous generator three-phase alternating current frequency of detection, voltage, electric current and
Harmonic content by its control algolithm and accurately direct torque, stablizes Synchronous generator output frequency, power quality
Higher three-phase alternating current.
One end of wave filter is connected with the multi-electrical level inverter of frequency converter, the other end connection motor of wave filter.Filter
Ripple device is used for filtering out the harmonic wave and impulse wave in the transformer frequency conversion ac source from frequency converter.The wave filter of the electric power system is adopted
Use sine wave filter.
Motor is connected by wave filter with frequency converter, and motor is for generation and transformation under the driving of frequency converter
Enough mechanical outputs of the corresponding rotating speed of variable frequency alternating current power source frequency or torque drive Synchronous generator.
Synchronous generator is connected with motor, and Synchronous generator is generation and frequency converter under the driving of motor
With frequency, by adjust excitation system generate according to transformer frequency conversion ac source of the frequency converter voltage frequency than same pressure.
Step-up transformer connecting detection unit simultaneously passes through long cable connection electric submersible pump, step-up transformer（It is electric when needing to raise
During pressure）For meeting voltage needed for electric submersible pump.
Long cable connection electric submersible pump and transformer, the function of long cable are to meet the change buckling of electric submersible pump requirement for conveying
Frequency AC power.
Electric submersible pump provides machine power to meet oil well output demand.
Detection unit connects motor, detection unit detection parameters of electric power, to monitor oil extraction system service.
Controller is connected with frequency converter, power supply, detection unit, and controller is used to monitor oil extraction system.Controller includes
DSP control system one, DSP control system two, DSP control system three and load-side control system.One end of DSP control system one
Connect frequency converter multi-electrical level inverter, the other end by fieldbus connect DSP control system two, DSP control system three,
Load-side control system is used to control frequency converter.One end connection intelligent power of DSP control system two, the other end pass through
Fieldbus is connected with DSP control system one, DSP control system three, load-side control system, is used to control synchronous generator
Group excitation.One end connecting detection unit of DSP control system three, the other end by fieldbus connect DSP control system one,
DSP control system two, load-side control system are used to monitor transmission of electricity parameter.Load-side control system is then for detecting electricity
Latent pump parameter.
This offshore oilfield electric submersible pump electric power system, when electric submersible pump is in load starting state：
The requirement that frequency converter starts according to the load of long cut cable electric submersible pump, varying frequency starting motor drive the synchronization of shaft coupling
Generating set works, and sends the three-phase alternating current of assigned frequency, is generated by adjusting excitation system according to frequency converter voltage frequency
Than the transformation alternating current of same pressure, transformer frequency conversion ac source is obtained after synthesis control, boosted transformer boosting passes through long cable
Supply electric submersible pump load.
The power supply of the offshore oilfield electric submersible pump electric power system use intelligent power, intelligent power connection frequency converter, controller,
Synchronous generator, intelligent power are encouraged according to the Synchronous generator three-phase alternating current voltage value and synchronous machine closed loop of detection
Magnetic control adjusts the three-phase voltage amplitude of its output, and Synchronous generator output is made to stablize suitable three-phase voltage value.
The offshore oilfield electric submersible pump electric power system, i.e. IMGEESP electric power systems, will according to the load variation of long cable distal end
It asks and load current situation of change, is instructed according to its frequency control, required for control adjustment Synchronous generator output loading
The three-phase alternating current to match.
The offshore oilfield electric submersible pump electric power system, i.e. IMGEESP electric power systems can also control system with long cable load end
System carries out data exchange, and according to the actual condition that electric submersible pump loads, the three phase variable frequency transformation of adjustment Synchronous generator output is handed over
Galvanic electricity realizes optimum control.
IMGEESP electric power systems in having traditional " frequency converter-cable-electric submersible pump powering mode " due to adding in " electricity
Motivation-generator " bi-motor link, the link isolated frequency converter generation harmonic wave, make cable run harmonic content low or
Substantially without harmonic wave.Due to being transmitted electricity using motor-generator-cable to the other end, which has isolated frequency converter production
Raw PWM electric pulses, i.e.,：No frequency converter pwm pulse interference, in this way, being just not present what is come due to frequency converter pwm pulse interference fringe
Various complex working conditions ask pointed peaky pulse, improve long cable and submersible motor service life.
The above is only that the preferred embodiment of the present invention is described, and is not that the scope of the present invention is limited
Fixed, on the premise of design spirit of the present invention is not departed from, this field ordinary skill technical staff makees technical scheme
The various modifications gone out and improvement should all be fallen into the protection domain that claims of the present invention determines.
Claims (5)
1. a kind of offshore oilfield electric submersible pump electric power system, including power supply, it is characterised in that：The offshore oilfield electric submersible pump power supply system
System further include frequency converter, wave filter, motor, Synchronous generator, step-up transformer, long cable, electric submersible pump, detection unit,
Controller, wherein：
Direct current is become the adjustable transformer frequency conversion ac source of frequency and voltage by the frequency converter；The frequency converter is according to detection
Synchronous generator three-phase alternating current frequency, voltage, electric current and harmonic content pass through its control algolithm and accurately torque
Control stablizes Synchronous generator output frequency, the higher three-phase alternating current of power quality；
The wave filter is connected with frequency converter, and the wave filter is used for filtering out in the transformer frequency conversion ac source from frequency converter
Harmonic wave and impulse wave；
The motor is connected by wave filter with frequency converter, and the motor is generation and transformation under the driving of frequency converter
Enough mechanical outputs of the corresponding rotating speed of variable frequency alternating current power source frequency or torque drive Synchronous generator；
The Synchronous generator is connected with motor, and the Synchronous generator is generated and become under the driving of motor
Frequency device with frequency, by adjust excitation system generate according to transformer frequency conversion ac source of the frequency converter voltage frequency than same pressure；
The step-up transformer connecting detection unit and by long cable connection electric submersible pump, the step-up transformer is for meeting electricity
Voltage needed for latent pump；
The long cable connection electric submersible pump and transformer, the long cable transfer meet the transformer frequency conversion ac of electric submersible pump requirement
Source；
The electric submersible pump provides machine power to meet oil well output demand；
The detection unit connects motor, and the detection unit detects parameters of electric power, to monitor oil extraction system service；
The controller is connected with frequency converter, power supply, detection unit, and the controller is used to monitor oil extraction system；
The controller includes DSP control system one, DSP control system two, DSP control system three and load-side control system,
For controlling frequency converter, the DSP control system two is used to control Synchronous generator excitation, institute the DSP control system one
State DSP control system three for monitor transmit electricity parameter, the load-side control system be used for detect electric submersible pump parameter；
The electric submersible pump is load starting state, and frequency converter is according to the requirement of long cut cable electric submersible pump load startup, varying frequency starting
Motor drives the Synchronous generator of shaft coupling to work, sends the three-phase alternating current of assigned frequency, is produced by adjusting excitation system
According to transformation alternating current of the frequency converter voltage frequency than same pressure, synthesis obtains transformer frequency conversion ac source after controlling, boosted for life
Transformer boosts, and supplying electric submersible pump by long cable loads.
2. offshore oilfield electric submersible pump electric power system as described in claim 1, it is characterised in that：The wave filter is filtered for sine wave
Ripple device.
3. offshore oilfield electric submersible pump electric power system as described in claim 1, it is characterised in that：The power supply is intelligent power；
The intelligent power is controlled according to the Synchronous generator three-phase alternating current voltage value and synchronous machine Closed-loop Excitation of detection and adjusted
Its three-phase voltage amplitude exported makes Synchronous generator output stablize suitable three-phase voltage value.
4. offshore oilfield electric submersible pump electric power system as described in claim 1, it is characterised in that：The electric power system is according to long cable
Distal end load variation requirement and load current situation of change, instruct according to its frequency control, control adjustment Synchronous generator
The required three-phase alternating current to match of output loading.
5. offshore oilfield electric submersible pump electric power system as described in claim 1, it is characterised in that：The electric power system also with long cable
It loads end control system and carries out data exchange, according to the actual condition that electric submersible pump loads, adjust the three of Synchronous generator output
Phase inverter transformation alternating current realizes optimum control.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610029188.1A CN105577054B (en) | 2016-01-18 | 2016-01-18 | A kind of offshore oilfield electric submersible pump electric power system |
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| CN201610029188.1A CN105577054B (en) | 2016-01-18 | 2016-01-18 | A kind of offshore oilfield electric submersible pump electric power system |
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| CN105577054B true CN105577054B (en) | 2018-06-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108768148A (en) * | 2018-06-16 | 2018-11-06 | 福建华宏天城机电设备有限公司 | A kind of submersible motor power conditioner |
| CN113484644A (en) * | 2021-07-13 | 2021-10-08 | 中国海洋石油集团有限公司 | Submarine cable simulation device and method suitable for testing long-distance variable-frequency power supply system |
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| CN1383247A (en) * | 2001-04-23 | 2002-12-04 | 北京科技咨询中心 | Efficient energy saving system for AC-DC-AC electric distribution and electric terminals in oil field |
| CN102072090A (en) * | 2009-11-19 | 2011-05-25 | 上海万德风力发电股份有限公司 | Domestic fan direct water-lift type wind-solar hybrid generating and water-lift multipurpose system |
| CN103261571A (en) * | 2010-09-13 | 2013-08-21 | 阿克海底公司 | Stable subsea electric power transmission to run subsea high speed motors |
| CN103797676A (en) * | 2011-09-12 | 2014-05-14 | 阿克海底公司 | Device for stable subsea electric power transmission to run subsea high speed motors or other subsea loads |
| CN204646555U (en) * | 2015-05-14 | 2015-09-16 | 胜利油田高原石油装备有限责任公司 | Wind-power electricity generation drives linear electric motor oil-immersed pump oil production system |
-
2016
- 2016-01-18 CN CN201610029188.1A patent/CN105577054B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383247A (en) * | 2001-04-23 | 2002-12-04 | 北京科技咨询中心 | Efficient energy saving system for AC-DC-AC electric distribution and electric terminals in oil field |
| CN102072090A (en) * | 2009-11-19 | 2011-05-25 | 上海万德风力发电股份有限公司 | Domestic fan direct water-lift type wind-solar hybrid generating and water-lift multipurpose system |
| CN103261571A (en) * | 2010-09-13 | 2013-08-21 | 阿克海底公司 | Stable subsea electric power transmission to run subsea high speed motors |
| CN103797676A (en) * | 2011-09-12 | 2014-05-14 | 阿克海底公司 | Device for stable subsea electric power transmission to run subsea high speed motors or other subsea loads |
| CN204646555U (en) * | 2015-05-14 | 2015-09-16 | 胜利油田高原石油装备有限责任公司 | Wind-power electricity generation drives linear electric motor oil-immersed pump oil production system |
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