CN105577054A - Offshore oilfield electric submersible pump power supply system - Google Patents
Offshore oilfield electric submersible pump power supply system Download PDFInfo
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- CN105577054A CN105577054A CN201610029188.1A CN201610029188A CN105577054A CN 105577054 A CN105577054 A CN 105577054A CN 201610029188 A CN201610029188 A CN 201610029188A CN 105577054 A CN105577054 A CN 105577054A
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- submersible pump
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- electric submersible
- frequency converter
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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
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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
- 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
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- Control Of Eletrric Generators (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to an offshore oilfield electric submersible pump power supply system. The offshore oilfield electric submersible pump power supply system comprises a power supply, a frequency converter, a filter, an electric motor, a synchronous generator set, a boosting transformer, a long cable, an electric submersible pump, a detection unit and a controller. The offshore oilfield electric submersible pump power supply system adopts a power supply source scheme of frequency converter-electric motor-synchronous generator set-cable-electric submersible pump; and compared with the conventional power supply mode of frequency converter-cable-electric submersible pump in the prior art, the system is simple in structure, low in cost and higher in control effectiveness than that in the prior art.
Description
Technical field
The present invention relates to a kind of electric power system, be specifically related 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, needs to carry out frequency control according to oil-immersed pump load variations situation, therefore, and must attached with frequency converters.Like this, the electric power thus supplied of electric submersible pump has three types.Electric immersible pump for oil extraction (that is: motor+oil-immersed pump) the first type supply power mode, conventional distance power supply (power supply distance is less than 50Km), maximum supply power voltage 36Kv, single cable capacity 50Kva, install transformer additional, but frequency converter is installed at cable head-end when cable length is greater than 20Km; The second type supply power mode, long distance power supply (power supply distance is less than 200Km), maximum supply power voltage 140Kv, single cable capacity 200Kva, frequency converter is installed at cable end piece; The third type supply power mode, extra long distance is powered (power supply distance is greater than 200Km), exchanges maximum transfer capacity 50Kva, and voltage fluctuation is large, so direct current transportation mode should be adopted effective, frequency converter is still installed at cable end piece.
Because frequency converter contains PWM inversion link; harmonic wave and pulse will be produced so be in operation; due to not mating of the very long load impedance in addition of submarine cable and cable resistance, harmonic wave and pulse will be reflected and cause cable end piece overvoltage, the safety of crisis cable and motor winding.For second and the third type supply power mode, due to frequency converter and submersible electric machine with oil close together, there is not potential safety hazard.For the first type electric power system, generally all adopt the power supply structure of " frequency converter-cable-electric submersible pump ", be called for short IEESP electric power system, as shown in Figure 1.This electric power system is primarily of compositions such as frequency converter, filter, cable, electric submersible pumps, and the outstanding problem that this system exists is:
The first, humorous wave reflection.Harmonic wave is extremely serious, number of times, the harmonic current content of major harmonic are complicated, and long cable can form LCR loop makes the easy resonance of Circuits System, the high order harmonic component adding the generation of upconverter power electronic device produces very large harm to motor and cable insulation, when superposing with long distance motor side emitting voltage with time-harmonic wave generation transmitted wave, submersible electric machine with oil terminal voltage value voltage value has increase effect, and its result causes submersible electric machine with oil terminal voltage excessive, very easily damages cable and submersible electric machine with oil winding insulation.Oil-immersed pump frequency conversion needs speed governing, inverter supply output frequency working point is not fixed, and corresponding frequency converter each working point frequency has multiple harmonic wave, so harmonic wave is distributed in very wide frequency domain, like this, even if the good again filter of performance can not all harmonic waves effectively under all secondary frequencies of filtering.In addition, because harmonic wave exists, when the long cable power supply of frequency converter, cause supply power voltage electric current unstable, can not the operating mode of effective control load.Equally, make to power in this way, must be high voltage converter concerning frequency converter, makes frequency converter and filter high cost.
The second, frequency converter pwm pulse reflects.The characteristic impedance of long transmission cable and the characteristic impedance of electric submersible pump load are not mated and are caused submersible electric machine with oil end pulse voltage excessive, and voltage excessive moment occurs in rising edge of a pulse and falling edge, very easily damages cable and submersible electric machine with oil winding insulation.
3rd, harmonic wave control problem--" mole beaten by harmonic wave " phenomenon.More complicated is there is " mole beaten by harmonic wave " phenomenon in harmonic wave control, that is: certain frequency harmonics suppressed fall, another kind of frequency harmonics is reinforced again, cannot effect a radical cure.Such puzzlement is the difficult problem that frequency converter and long transmission cable field power always.
4th, impulse wave governing problem--" impulse wave beats mole " phenomenon.Research shows, it is install filter additional at load end that impulse wave administers most effective method, and offshore oilfield electric submersible pump filter installs high cost additional.In addition, be administer harmonic wave, adding source filter is good selection, and the principle of active filter utilizes pwm pulse ripple to administer harmonic wave, and total and harmonic wave is delayed, creates again more impulse wave in theory.Therefore, harmonic wave control produces again " impulse wave beats mole " phenomenon.
In sum, for the first supply power mode, filter can only filtering fractional harmonic, also there will be various " beating mole " phenomenon, like this, passively quietly can only bear for harmonic wave and impulse wave cable and submersible electric machine with oil winding that Keep Clear-High Voltage, technically " being willing and yet unable to help ", its insulation level is subject to serious challenge.Therefore, electric voltage frequency is controlled and electric power system pattern without harmonic wave is that offshore oilfield is significantly expected.
Summary of the invention
For the technical problem existed in prior art, the invention provides a kind of offshore oilfield electric submersible pump electric power system, this electric power system is connected and composed by frequency converter, filter, motor, generator, cable, electric submersible pump, define the generating captain cable powering supplying pattern of advantage integrating power electronic technology, generator powered, system structure is simple, cost is low, controls validity and is better than prior art.
To achieve these goals, the present invention adopts following technical scheme.
A kind of offshore oilfield electric submersible pump electric power system, comprises power supply, also comprises frequency converter, filter, motor, Synchronous generator, step-up transformer, long cable, electric submersible pump, detecting unit, controller, wherein:
Direct current is become all adjustable variable voltage variable frequency AC power of frequency and voltage by described frequency converter;
Described filter is connected with frequency converter, and described filter is used for filtering from the harmonic wave in the variable voltage variable frequency AC power of frequency converter and impulse wave;
Described motor is connected with frequency converter by filter, and described motor is under the driving of frequency converter, produce rotating speed corresponding with variable voltage variable frequency ac power frequency enough mechanical outputs or torque, drives Synchronous generator;
Described Synchronous generator is connected with motor, described Synchronous generator be produce under the driving of motor with frequency converter with frequently, by regulating excitation system to produce according to the same variable voltage variable frequency AC power of pressing of frequency converter voltage frequency ratio;
Described step-up transformer connects detecting unit and connects electric submersible pump by long cable, and described step-up transformer is used for meeting electric submersible pump required voltage;
Described long cable connects electric submersible pump and transformer, and described long cable transfer meets the variable voltage variable frequency AC power of electric submersible pump requirement;
Described electric submersible pump provides machine power for meeting oil well output demand;
Described detecting unit connects motor, and described detecting unit detects parameters of electric power, is the service of monitoring oil extraction system;
Described controller is connected with frequency converter, power supply, detecting unit, and described controller is for monitoring oil extraction system;
Described controller comprises DSP control system one, DSP control system two, DSP control system three and load-side control system, described DSP control system one is for controlling frequency converter, described DSP control system two is for control synchronization generating unit excitation, described DSP control system three is for monitoring transmission of electricity parameter, and described load-side control system is for detecting electric submersible pump parameter;
Described electric submersible pump is load starting state, the requirement that frequency converter starts according to long cut cable electric submersible pump load, varying frequency starting motor, drive the Synchronous generator work of shaft coupling, send the three-phase alternating current of assigned frequency, by regulating excitation system to produce according to the transformation alternating current of frequency converter voltage frequency ratio with pressure, synthesis obtains variable voltage variable frequency AC power after controlling, through step-up transformer boosting, by the load of long cable supply electric submersible pump.
Preferably, described filter is sine wave filter.
In above-mentioned arbitrary technical scheme preferably, described frequency converter is according to the Synchronous generator three-phase alternating current frequency detected, voltage, electric current and harmonic content, by its control algolithm and direct torque accurately, Synchronous generator output frequency is stablized, the three-phase alternating current that the quality of power supply is higher.
In above-mentioned arbitrary technical scheme preferably, described power supply is intelligent power; Described intelligent power is according to the Synchronous generator three-phase alternating current magnitude of voltage detected, and synchronous motor Closed-loop Excitation controls its three-phase voltage amplitude exported of adjustment, makes the three-phase voltage value that Synchronous generator stable output is suitable.
In above-mentioned arbitrary technical scheme preferably, this electric power system is according to the requirement of long cable far-end load variations, and load current situation of change, according to its frequency control instruction, control the three-phase alternating current matched required for the output loading of adjustment Synchronous generator.
In above-mentioned arbitrary technical scheme preferably, this electric power system also carries out exchanges data with long cable load end control system, and according to the actual condition of electric submersible pump load, the three phase variable frequency transformation alternating current that adjustment Synchronous generator exports, realizes optimal control.
The present invention be directed to current offshore oilfield electric submersible pump power supply station's Problems existing and a kind of new solution proposed.The present invention relates to a kind of power supply based on " frequency converter-cable-electric submersible pump " of offshore oilfield, particularly relate to the power supply of offshore oilfield one " frequency converter-motor-synchronous generator-cable-electric submersible pump ".Offshore oilfield electric submersible pump electric power system of the present invention is primarily of compositions such as frequency converter, filter, motor, generator, cable, electric submersible pumps.That is: the power supply scheme of frequency converter-motor-synchronous generator-cable-electric submersible pump, is called for short IMGEESP electric power system.This generating captain cable powering supplying pattern of advantage integrating power electronic technology, generator powered provided by the invention, the power supply of this powering mode have with low cost, design ingenious, particularly harmonic content low, without frequency converter impulse disturbances, control the advantages such as effective.
Compared with prior art frequency converter-cable-electric submersible pump powering mode, offshore oilfield electric submersible pump electric power system of the present invention, namely the advantage of IMGEESP electric power system is:
1, due in existing tradition " frequency converter-cable-electric submersible pump powering mode ", add " motor-generator " bi-motor link, obviously, this link has isolated the harmonic wave that frequency converter produces, and makes cable line harmonic content low or substantially without harmonic wave;
2, owing to adopting " motor-generator-cable " to transmit electricity to the other end, this link has isolated the PWM electric pulse that frequency converter produces, that is: disturb without frequency converter pwm pulse, like this, just do not exist because frequency converter pwm pulse disturbs the various complex working conditions brought to ask pointed peaky pulse, improve long cable and submersible electric machine with oil useful life.
Accompanying drawing explanation
Fig. 1 is one of the prior art " frequency converter-cable-electric submersible pump " electric power system structural representation;
Fig. 2 is " frequency converter-motor-synchronous generator-cable-electric submersible pump " electric power system structural representation of the preferred embodiment according to offshore oilfield electric submersible pump electric power system of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated, below describe only exemplarily and explain, any pro forma restriction is not done to the present invention.
As shown in Figure 2, offshore oilfield electric submersible pump electric power system is connected and composed by power supply, frequency converter, filter, motor, Synchronous generator, step-up transformer, long cable, electric submersible pump, detecting unit, controller, and this is a kind of new solution proposed for current offshore oilfield electric submersible pump power supply station's Problems existing.This offshore oilfield electric submersible pump electric power system relates to a kind of power supply based on " frequency converter-cable-electric submersible pump " of offshore oilfield, particularly relate to the power supply of offshore oilfield one " frequency converter-motor-synchronous generator-cable-electric submersible pump ", that is: the power supply scheme of frequency converter-motor-synchronous generator-cable-electric submersible pump, be called for short IMGEESP electric power system, this generating captain cable powering supplying pattern, with low cost, design ingenious, particularly harmonic content low, without frequency converter impulse disturbances, control the advantages such as effective.
The concrete formation of this offshore oilfield electric submersible pump electric power system and each parts annexation be as shown in Figure 2:
Frequency converter connects filter and controller, and the function of frequency converter direct current is become all adjustable variable voltage variable frequency AC power of frequency and voltage.Frequency converter comprises rectifier and multi-electrical level inverter, and rectifier is connected with multi-electrical level inverter, and multi-electrical level inverter is connected with controller.Frequency converter is according to the Synchronous generator three-phase alternating current frequency detected, and voltage, electric current and harmonic content, by its control algolithm and direct torque accurately, make Synchronous generator output frequency stablize, the three-phase alternating current that the quality of power supply is higher.
One end of filter is connected with the multi-electrical level inverter of frequency converter, and the other end of filter connects motor.Filter is used for filtering from the harmonic wave in the variable voltage variable frequency AC power of frequency converter and impulse wave.The filter of this electric power system adopts sine wave filter.
Motor is connected with frequency converter by filter, and motor is used under the driving of frequency converter, produce rotating speed corresponding with variable voltage variable frequency ac power frequency enough mechanical outputs or torque, drives Synchronous generator.
Synchronous generator is connected with motor, Synchronous generator be produce under the driving of motor with frequency converter with frequently, by regulating excitation system to produce according to the same variable voltage variable frequency AC power of pressing of frequency converter voltage frequency ratio.
Step-up transformer connects detecting unit and connects electric submersible pump by long cable, and step-up transformer (when needs boosted voltage) is for meeting electric submersible pump required voltage.
Long cable connects electric submersible pump and transformer, and the function of long cable is used to carry the variable voltage variable frequency AC power meeting electric submersible pump and require.
Electric submersible pump provides machine power for meeting oil well output demand.
Detecting unit connects motor, and detecting unit detects parameters of electric power, is the service of monitoring oil extraction system.
Controller is connected with frequency converter, power supply, detecting unit, and controller is for monitoring oil extraction system.Controller comprises DSP control system one, DSP control system two, DSP control system three and load-side control system.One end of DSP control system one connects the multi-electrical level inverter of frequency converter, and its other end connects DSP control system two, DSP control system three, load-side control system by fieldbus, and it is for controlling frequency converter.One end of DSP control system two connects intelligent power, and its other end is connected with DSP control system one, DSP control system three, load-side control system by fieldbus, and it is for control synchronization generating unit excitation.One end of DSP control system three connects detecting unit, and its other end connects DSP control system one, DSP control system two, load-side control system by fieldbus, and it is for monitoring transmission of electricity parameter.Load-side control system is then for detecting electric submersible 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 long cut cable electric submersible pump load, varying frequency starting motor, drive the Synchronous generator work of shaft coupling, send the three-phase alternating current of assigned frequency, produce according to the transformation alternating current of frequency converter voltage frequency ratio with pressure by regulating excitation system, synthesis obtains variable voltage variable frequency AC power after controlling, through step-up transformer boosting, by the load of long cable supply electric submersible pump.
The power acquisition intelligent power of this offshore oilfield electric submersible pump electric power system, intelligent power connects frequency converter, controller, Synchronous generator, intelligent power is according to the Synchronous generator three-phase alternating current magnitude of voltage detected, and synchronous motor Closed-loop Excitation controls its three-phase voltage amplitude exported of adjustment, makes the three-phase voltage value that Synchronous generator stable output is suitable.
This offshore oilfield electric submersible pump electric power system, i.e. IMGEESP electric power system, according to the requirement of long cable far-end load variations, and load current situation of change, according to its frequency control instruction, control the three-phase alternating current matched required for the output loading of adjustment Synchronous generator.
This offshore oilfield electric submersible pump electric power system, i.e. IMGEESP electric power system, can also carry out exchanges data, according to the actual condition of electric submersible pump load with long cable load end control system, the three phase variable frequency transformation alternating current that adjustment Synchronous generator exports, realizes optimal control.
IMGEESP electric power system owing to adding " motor-generator " bi-motor link in existing tradition " frequency converter-cable-electric submersible pump powering mode ", this link has isolated the harmonic wave that frequency converter produces, and makes cable line harmonic content low or substantially without harmonic wave.Transmit electricity to the other end owing to adopting motor-generator-cable, this link has isolated the PWM electric pulse that frequency converter produces, that is: disturb without frequency converter pwm pulse, like this, just do not exist because frequency converter pwm pulse disturbs the various complex working conditions brought to ask pointed peaky pulse, improve long cable and submersible electric machine with oil useful life.
The above is only be described the preferred embodiment of the present invention; not that scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that the common engineers and technicians in this area make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determine.
Claims (6)
1. an offshore oilfield electric submersible pump electric power system, comprise power supply, it is characterized in that: described offshore oilfield electric submersible pump electric power system also comprises frequency converter, filter, motor, Synchronous generator, step-up transformer, long cable, electric submersible pump, detecting unit, controller, wherein:
Direct current is become all adjustable variable voltage variable frequency AC power of frequency and voltage by described frequency converter;
Described filter is connected with frequency converter, and described filter is used for filtering from the harmonic wave in the variable voltage variable frequency AC power of frequency converter and impulse wave;
Described motor is connected with frequency converter by filter, and described motor is under the driving of frequency converter, produce rotating speed corresponding with variable voltage variable frequency ac power frequency enough mechanical outputs or torque, drives Synchronous generator;
Described Synchronous generator is connected with motor, described Synchronous generator be produce under the driving of motor with frequency converter with frequently, by regulating excitation system to produce according to the same variable voltage variable frequency AC power of pressing of frequency converter voltage frequency ratio;
Described step-up transformer connects detecting unit and connects electric submersible pump by long cable, and described step-up transformer is used for meeting electric submersible pump required voltage;
Described long cable connects electric submersible pump and transformer, and described long cable transfer meets the variable voltage variable frequency AC power of electric submersible pump requirement;
Described electric submersible pump provides machine power for meeting oil well output demand;
Described detecting unit connects motor, and described detecting unit detects parameters of electric power, is the service of monitoring oil extraction system;
Described controller is connected with frequency converter, power supply, detecting unit, and described controller is for monitoring oil extraction system;
Described controller comprises DSP control system one, DSP control system two, DSP control system three and load-side control system, described DSP control system one is for controlling frequency converter, described DSP control system two is for control synchronization generating unit excitation, described DSP control system three is for monitoring transmission of electricity parameter, and described load-side control system is for detecting electric submersible pump parameter;
Described electric submersible pump is load starting state, the requirement that frequency converter starts according to long cut cable electric submersible pump load, varying frequency starting motor, drive the Synchronous generator work of shaft coupling, send the three-phase alternating current of assigned frequency, by regulating excitation system to produce according to the transformation alternating current of frequency converter voltage frequency ratio with pressure, synthesis obtains variable voltage variable frequency AC power after controlling, through step-up transformer boosting, by the load of long cable supply electric submersible pump.
2. offshore oilfield electric submersible pump electric power system as claimed in claim 1, is characterized in that: described filter is sine wave filter.
3. offshore oilfield electric submersible pump electric power system as claimed in claim 1, it is characterized in that: described frequency converter is according to the Synchronous generator three-phase alternating current frequency detected, voltage, electric current and harmonic content, by its control algolithm and direct torque accurately, Synchronous generator output frequency is stablized, the three-phase alternating current that the quality of power supply is higher.
4. offshore oilfield electric submersible pump electric power system as claimed in claim 1, is characterized in that: described power supply is intelligent power; Described intelligent power is according to the Synchronous generator three-phase alternating current magnitude of voltage detected, and synchronous motor Closed-loop Excitation controls its three-phase voltage amplitude exported of adjustment, makes the three-phase voltage value that Synchronous generator stable output is suitable.
5. offshore oilfield electric submersible pump electric power system as claimed in claim 1, it is characterized in that: this electric power system is according to the requirement of long cable far-end load variations, and load current situation of change, according to its frequency control instruction, control the three-phase alternating current matched required for the output loading of adjustment Synchronous generator.
6. offshore oilfield electric submersible pump electric power system as claimed in claim 1, it is characterized in that: this electric power system also carries out exchanges data with long cable load end control system, according to the actual condition of electric submersible pump load, the three phase variable frequency transformation alternating current that adjustment Synchronous generator exports, realizes optimal control.
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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 CN105577054B (en) | 2018-06-01 |
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Cited By (3)
| 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 |
| CN114844437A (en) * | 2022-06-08 | 2022-08-02 | 青岛海洋工程水下设备检测有限公司 | Motor control system and seabed power 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 |
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| CN105577054B (en) | 2018-06-01 |
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