CN106208062A - A kind of energy-accumulated electric switched workover rig electric-control system - Google Patents
A kind of energy-accumulated electric switched workover rig electric-control system Download PDFInfo
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- CN106208062A CN106208062A CN201610665957.7A CN201610665957A CN106208062A CN 106208062 A CN106208062 A CN 106208062A CN 201610665957 A CN201610665957 A CN 201610665957A CN 106208062 A CN106208062 A CN 106208062A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of energy-accumulated electric switched workover rig electric-control system, including loading hydraulic system and pneumatic system on four-quadrant PWM rectifier, energy-storage battery or super capacitor, energy storage management system, variable frequency inverter, main motor, controller, car, wherein: four-quadrant PWM rectifier is connected with well site transformator, it is used for carrying out constant current output；Variable frequency inverter is connected with four-quadrant PWM rectifier, is used for driving main motor load running；Energy-storage battery or super capacitor are directly connected on the dc bus between variable frequency inverter and four-quadrant PWM rectifier；Load hydraulic system on car and pneumatic system is connected on the ac bus between four-quadrant PWM rectifier and well site transformator, for as load；Controller is used for connecting four-quadrant PWM rectifier, variable frequency inverter, energy-storage battery or super capacitor, energy storage management system, for detecting the parameter information of all parts and controlling the operation of all parts.The present invention can solve the harmonic problem that prior art exists, the problem such as bearing power optimum coordinated allocation problem and energy feedback.
Description
Technical field
The present invention relates to oil field operation equipment, be specifically related to a kind of energy-accumulated electric switched workover rig electric-control system.
Background technology
Workover rig is the specialized plant equipment keeping in repair pipe string of oil field downhole or well bore, is mainly used in oil pipe, takes out
The lifting of beam hanger and oil well pump with the operation such as transfer.At present, diesel engine is the major impetus source of workover rig operation.Diesel oil well workover
Machine is more and more unsatisfactory because of following shortcoming:
(1) constantly riseing along with diesel-fuel price so that the cost of workover treatment increases substantially；
(2) diesel combustion can produce substantial amounts of harmful gas, causes environmental pollution, and this had not both met what national energy-saving reduced discharging
Industrial policy, does not meets the requirement of environmental conservation yet；
(3) diesel oil workover rig is only converted into mechanical energy by the 30% of produced for diesel combustion heat energy, causes diesel oil workover rig
Power consumption height；
(4) mechanical transmission path of usual diesel oil workover rig is long, and transmission efficiency is only about 0.6, causes workover rig to work
Efficiency comparison is low.
Accordingly, it would be desirable to the inexpensive clean energy replaces the diesel oil main power source as workover rig.At present, can repair by diesel oil substitute
Well machine and most have development potentiality is electric workover rig, its core drive source comes from the electrical network of cleaning.With diesel oil well workover
Machine is compared, and the advantage of electric workover rig is:
(1) electrical network energy prices are relatively low；
(2) electric workover rig is during electric energy is changed, and dissipation energy is all dispersed in air with the form of heat, no
Can be to environment；
(3) capacity usage ratio of the equipment of the power electronics in electric workover rig is the highest, all can arrive more than 90%, institute
Few with power consumption in energy transfer process；
(4) transmission efficiency of electric workover rig brings up to 80%.
But, owing to well site distribution system capacity configures according to energy needed for oil-field oil pumper, general capacity
For 30KW～150KW, it is impossible to meet workover rig and carry out lifting and required merit when transferring operation of oil pipe, sucker rod and oil well pump
Rate；If separately configuration Large Copacity well site transformator uses requirement to meet well workover, on the one hand, will strengthen equipment control difficulty and
Cost of investment；On the other hand, because workover treatment is provisional work, configuration Large Copacity well site transformator, at oil pumper just
In often running it would appear that " low load with strong power " and cause the excessive situation of transformer loss.Accordingly, it would be desirable to a kind of energy source device
As accessory power supply, auxiliary well site transformator carries out operation, for the properly functioning offer energy source of workover treatment.
Patent electric workover rig Operation Van (patent No.: ZL 01250405.X) gives a kind of electric workover rig scheme, electricity
Well site transformator is taken from source.Although this patent solves above-mentioned electric workover rig problem, but, if well site power supply capacity is little or
Person has a power failure, electric workover rig cisco unity malfunction.
Patent electric power system of electric workover rig (patent No.: ZL 200920107125.9) gives a kind of electric energy-stored repair
Well machine scheme, is directly incorporated into energy-storage battery or super capacitor on the dc bus of converter.Although this patent solves above-mentioned
Electric energy-stored workover rig problem, but there is also a lot of problem:
(1) harmonic problem.The diode rectification module of converter uses uncontrollable rectification, in the mistake of converter work
Cheng Zhong, causes serious harmonic pollution to electrical network, and total harmonic distortion factor reaches 24.25%.
(2) bearing power optimum coordinated allocation problem.Energy-storage battery or super capacitor are directly articulated to the direct current of converter
On bus, be equivalent to two uncontrollable voltage sources in parallel, jointly run power supply for main motor frequency control.Former according to circuit
Reason, two uncontrollable voltage source parallel runnings can make bearing power unreasonable distribution.Will be caused some when loading bigger
Voltage source transships and another voltage source underrun, reduces the reliability of whole electric-control system.If well site transformer overload, well
Field transformer-supplied is dangerous；If energy-storage battery or super capacitor nonoverload, it is necessary to energy-storage battery that design capacity is big or
Super capacitor group.Therefore, bearing power change should be realized energy-storage battery or super capacitor and well site power supply optimum association by controller
Adjust distribution.
(3) energy feedback problem.Energy-storage battery or super capacitor are directly articulated on the dc bus of converter, work as electricity
During dynamic workover rig playback weight work, the biggest feedback electric energy will be produced.If being directly stored in energy-storage battery or super capacitor
In, need to increase energy-storage battery or the capacity of super capacitor and invest excessive.Prior art uses it for resistive braking consumption, makes
Become waste of energy.
Patent of invention one electronic control system of electric workover rig (patent No.: ZL 201210123654.4) thoroughly solves existing
With the presence of the problem above of technology, give four-quadrant PWM (Pulse Width Modulation, pulse width modulation) and
The energy-storage battery of DC/DC control or the preferable solution of super capacitor.Patent of the present invention gives again a more preferable solution
Scheme, can be referred to as the fine work in scheme.
Summary of the invention
The present invention provides a kind of energy-accumulated electric switched workover rig electric-control system, to solve the automatically controlled system of the electric workover rig of prior art
The technical problem that system exists.
In order to solve above-mentioned technical problem, embodiments provide a kind of energy-accumulated electric switched workover rig electric-control system, institute
State energy-accumulated electric switched workover rig electric-control system to include: pulse width modulation four-quadrant PWM rectifier, energy-storage battery or super capacitor,
Hydraulic system and pneumatic system is loaded, wherein on energy storage management system, variable frequency inverter, main motor, controller, car:
Described four-quadrant PWM rectifier, is connected with well site transformator, is used under the effect of four-quadrant PWM control strategy,
Carry out constant voltage output, or carry out constant current output (maximum operating currenbt or reference current value can be preset)；
Described variable frequency inverter, is connected with four-quadrant PWM rectifier by dc bus, is used for driving main motor to load
Run；
Described energy-storage battery or super capacitor, be directly connected between variable frequency inverter and four-quadrant PWM rectifier is straight
On stream bus, wherein, variable frequency inverter and four-quadrant PWM rectifier are used to control energy-storage battery or the discharge and recharge of super capacitor
Function, carries out bi-directional voltage stabilizing output；
Described energy storage management system, to charging and discharging state (temperature, voltage etc. within energy-storage battery or super capacitor system
Information) it is monitored；
Described main motor, is connected on the outfan of variable frequency inverter, for driving the mechanical lift systems of workover rig to do work；
Load hydraulic system and pneumatic system on described car, be connected between four-quadrant PWM rectifier and well site transformator
Ac bus on, for as additional load on car；
Described controller, is used for connecting four-quadrant PWM rectifier, variable frequency inverter, energy-storage battery or super capacitor, energy storage
Management system, for detecting the voltage of all parts, current parameters information, and sends the fortune of command information control various piece
OK.
Preferably, described energy-accumulated electric switched workover rig electric-control system also includes electric power incoming line master switch, described electric power incoming line
Master switch: on the ac bus being connected between four-quadrant PWM rectifier and well site transformator, with described controller phase
Even, control the switch between four-quadrant PWM rectifier and well site transformator, to control whether electric workover rig uses well site electricity
Source.
In any of the above-described technical scheme preferably, it is in underloading at electric workover rig described in technical solution of the present invention
Motoring condition: when controller judges energy-storage battery or super capacitor state-of-charge SOC (state ofcharge) reaches 1.0,
Using four-quadrant PWM rectifier as controlled constant-current source isolated operation, provide DC source, wherein, four-quadrant for variable frequency inverter
Limit PWM rectifier should be equal to the electric current required for variable frequency inverter in line current；Or, when controller judges energy-storage battery or super
Electric capacity state-of-charge SOC is when being not up to 1.0 for level, is that variable frequency inverter carries using four-quadrant PWM rectifier as controlled constant-current source
For, while DC source, directly carrying out constant-current charge for energy-storage battery or super capacitor, wherein.Four-quadrant PWM rectifier
It is more than the electric current required for variable frequency inverter in line current.
In any of the above-described technical scheme preferably, electric workover rig described in technical solution of the present invention is in weight
Carry motoring condition: when controller judges energy-storage battery or super capacitor electricity abundance, by four-quadrant PWM rectifier and super electricity
Hold both parallel runnings and provide electric energy for variable frequency inverter: its electric current is by constant current mode operation by four-quadrant PWM rectifier
Its reference current value, energy-storage battery or super capacitor are pressed constant voltage mode and are run, difference between load current value and reference current value
Part is provided by energy-storage battery or super capacitor；Or, when four-quadrant PWM rectifier, by the operation of constant current operational mode, its electric current is
During reference current value, when controller judges that energy-storage battery or super capacitor electricity are not enough to provide load current value and reference current
Between value during difference, electric workover rig should stop operation, and can four-quadrant PWM rectifier be run, directly by constant voltage or constant current mode
Connect and be charged for energy-storage battery or super capacitor, work on after charging.
In any of the above-described technical scheme preferably, described in technical solution of the present invention, electric workover rig is in down
Generating state: when controller judges that electric workover rig main motor is in the time of falling generating state, electric workover rig main motor falls
Generation current is less than energy-storage battery or the restriction of super capacitor charging current and energy-storage battery or super capacitor state-of-charge SOC does not reaches
During to 1.0, variable frequency inverter in a dormant state, is charged by four-quadrant PWM rectifier directly to energy-storage battery or super capacitor；
Or, when controller judges that electric workover rig main motor is in the time of falling generating state, electric workover rig main motor generates electricity electricity
Stream is more than energy-storage battery or the restriction of super capacitor charging current and energy-storage battery or super capacitor state-of-charge SOC is not up to 1.0,
Four-quadrant PWM rectifier is in feedback grid portion of energy state, by variable frequency inverter by dc bus directly to energy storage electricity
Pond or super capacitor charging；Or, when controller judges that electric workover rig main motor is in the time of falling generating state, energy-storage battery or
Super capacitor state-of-charge SOC reaches 1.0, and four-quadrant PWM rectifier is in feedback grid energy state.
In any of the above-described technical scheme preferably, when the well site electricity of well site transformator in technical solution of the present invention
When source there is not electricity, main power source service entrance switch is in open position, and described energy-accumulated electric switched workover rig is in island state: when controller is sentenced
When disconnected electric workover rig is in island state, it is the hydraulic system of electric workover rig using four-quadrant PWM rectifier as inverter
With pneumatic system Alternating Current Power Supply, variable frequency inverter is utilized to provide variable frequency alternating current power source for main motor load；Or, when controller is sentenced
When disconnected electric workover rig is in island state, four-quadrant PWM rectifier is loaded on the car that inverter is electric workover rig
Hydraulic system and pneumatic system Alternating Current Power Supply；When controller judges that electric workover rig main motor is in the time of falling generating state, electricity
Dynamic workover rig main motor falls generation current and limits and energy-storage battery or super less than energy-storage battery or super capacitor charging current
Electric capacity state-of-charge SOC is not up to 1.0, variable frequency inverter is filled directly to energy-storage battery or super capacitor by dc bus
Electricity；Or, when controller judges that electric workover rig is in island state, it is electronic using four-quadrant PWM rectifier as inverter
Hydraulic system and pneumatic system Alternating Current Power Supply is loaded on the car of workover rig；When controller judges that electric workover rig main motor is in
The time of falling generating state, electric workover rig main motor fall generation current limit more than energy-storage battery or super capacitor charging current and
Energy-storage battery or super capacitor state-of-charge SOC are not up to 1.0, by variable frequency inverter by dc bus directly to energy-storage battery
Or super capacitor charging.
In any of the above-described technical scheme preferably, in real system runs, when well site fluid pressure motor starts electricity
When source capacity is insufficient, adjacent motor even load may be worked the mischief by its startup, therefore, and available four-quadrant PWM rectification
The inverter power auxiliary hydraulic pressure motor start-up of device, to ensure energy-accumulated electric switched workover rig system start-up safety.
In any of the above-described technical scheme preferably, at the scene in actual motion, when well site, transformer capacity is insufficient
Time, and also have the work of other pump load, and owing on well workover locomotive, hydraulic system main oil pump motor capacity is the biggest, will
Occur that the main oil pump motor start-up capacity of hydraulic system is inadequate, now, if starting hydraulic system main oil pump motor on car,
Will affect the work of other pump load, adjacent motor even load may be worked the mischief by its startup, therefore, and available four
The inverter power auxiliary hydraulic pressure motor start-up of quadrant PWM rectifier, to ensure energy-accumulated electric switched workover rig system start-up safety.
The present invention provides a kind of energy-accumulated electric switched workover rig electric-control system, including four-quadrant PWM rectifier, energy-storage battery or super
Hydraulic system and pneumatic system, electricity is loaded on level electric capacity, energy storage management system, variable frequency inverter, main motor, controller, car
Source inlet wire master switch, wherein: four-quadrant PWM rectifier is connected with well site transformator, is used for carrying out constant current output；Variable frequency inverter
It is connected with four-quadrant PWM rectifier, is used for driving main motor load running；Energy-storage battery or super capacitor are directly connected in change
Frequently, on the dc bus between inverter and four-quadrant PWM rectifier, variable frequency inverter and four-quadrant PWM rectifier are used to control
The charging/discharging function of energy-storage battery processed or super capacitor is to carry out bi-directional voltage stabilizing output；Hydraulic system and pneumatic system is loaded on car
It is connected on the ac bus between four-quadrant PWM rectifier and well site transformator, for as load；Controller is used for connecting
Four-quadrant PWM rectifier, variable frequency inverter, energy-storage battery or super capacitor, energy storage management system, for detecting all parts
Voltage, current parameters information, and send the operation of command information control various piece.The energy-accumulated electric switched workover rig of the present invention is automatically controlled
System can solve the problems such as harmonic problem, bearing power optimum coordinated allocation problem and the energy feedback of prior art existence.
Compared with prior art, the technique scheme of the present invention has the advantages that
(1) harmonic problem is solved.The application of four-quadrant PWM rectifier, had both decreased the harmonic wave pollution to electrical network, real again
Show the unity power factor of electrical network.
(2) bearing power optimum coordinated allocation problem is solved.The control law of controller can realize energy-storage battery or super
The optimum coordinated allocation that bearing power is changed by level electric capacity and well site power supply.Both will not make well site transformer overload, also will not make
Energy-storage battery or super capacitor overload and the suitable energy-storage battery of design capacity or super capacitor, thus ensure that power supply safety is transported
OK.
(3) electric workover rig generated energy can be fed back to electrical network.When electric workover rig playback weight work, will produce
The biggest raw feedback electric energy.If energy-storage battery or super capacitor charging are full of, by its feedback grid, it is to avoid use it for passing
The resistive braking consumption of system scheme, causes waste of energy.
(4) save two-way DC/DC and be greatly improved the reliability of system, reduce manufacturing cost, save and take up an area space.
(5) braking resistor is heater element, saves braking resistor and is being greatly improved the reliability of system, is reducing the system of production
While causing this and saving occupation of land space, also reclaim substantial amounts of retarding loss energy.
(6), at the scene in actual motion, when well site transformer capacity is insufficient, and same well site transformator also has other
Pump load works, and owing to hydraulic system main oil pump motor capacity is the biggest on well workover locomotive, arises that hydraulic system
Main oil pump motor start-up capacity inadequate, now, if starting hydraulic system main oil pump motor on car, will affect same
Other pump load work of well site transformator, adjacent motor even load may be worked the mischief by its startup, therefore, can profit
With the inverter power auxiliary hydraulic pressure motor start-up of four-quadrant PWM rectifier, to ensure that energy-accumulated electric switched workover rig system start-up is pacified
Entirely.That is: controller is by controlling four-quadrant PWM rectifier, it is achieved well site transformator and four-quadrant PWM rectifier are electronic jointly
The main oil pump motor of hydraulic system is loaded on the car of workover rig.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Electrical control system structure schematic diagram；
Fig. 2 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier band underloading energy Flow schematic diagram；
Fig. 3 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier band underloading rechargeable energy flow schematic diagram；
Fig. 4 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier band be fully loaded with discharge energy flow schematic diagram；
Fig. 5 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier no-load rechargeable energy flow schematic diagram；
Fig. 6 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier dormancy charge mode energy Flow schematic diagram；
Fig. 7 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier feedback grid energy charge mode energy Flow schematic diagram；
Fig. 8 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier feedback grid energy model energy Flow schematic diagram；
Fig. 9 is the energy-accumulated electric switched workover rig of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
Four-quadrant PWM rectifier inversion discharge mode energy Flow schematic diagram；
Figure 10 is the energy-accumulated electric switched well workover of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
The four-quadrant PWM rectifier inversion charge mode energy Flow schematic diagram of machine；
Figure 11 is the energy-accumulated electric switched well workover of a preferred embodiment of the energy-accumulated electric switched workover rig electric-control system according to the present invention
The four-quadrant PWM rectifier inversion main oil pump motor start-up mode energy Flow schematic diagram of machine.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
In order to overcome the existing in the prior art problem of electric workover rig, the embodiment of the present invention proposes a kind of band four-quadrant
Limit PWM rectifier and the energy-accumulated electric switched workover rig electric control system of energy-storage battery or super capacitor energy-storage dc bus and control thereof
Method.In order to make full use of the electrical network electric energy of well site transformator, extend energy-storage battery or the service life of super capacitor, the present invention
The electric workover rig electric control system of embodiment is loaded by output electric current, the variable frequency inverter outlet side of detection well site transformator
Electric current, then according to the ratio of reference current (maximum output current of well site transformator is referred to as reference current) with load current
Relatively, the mode of operation of four-quadrant PWM rectifier is selected.
As it is shown in figure 1, this is embodiment of the present invention one energy-accumulated electric switched workover rig electrical control system structure schematic diagram, described storage
Can electronic control system of electric workover rig include: four-quadrant PWM rectifier, energy-storage battery or super capacitor, variable frequency inverter, control
Hydraulic system and pneumatic system, electric power incoming line master switch etc. is loaded, wherein on device, car:
Four-quadrant PWM rectifier, is connected with well site transformator, under the effect of four-quadrant PWM control strategy, carries out
Constant voltage exports, or carries out constant current output；Four-quadrant PWM rectifier uses the four-quadrant PWM rectifier that can realize four quadrant running,
Achieve unity power factor control, network side current waveform sine, restrained effectively the harmonic pollution of electrical network.At four-quadrant
Under the effect of PWM rectifier control strategy, both can realize constant voltage output, constant current output can have been realized again.
Variable frequency inverter, is connected with four-quadrant PWM rectifier, is used for driving main motor load running；Wherein, in Fig. 1
Main motor is ac motor M.Variable frequency inverter can realize the variable frequency adjustment of frequency 0-400Hz, is used for driving main motor
Realize permanent torque or the output-constant operation of broadband, thus improve work efficiency and the capacity usage ratio of electric workover rig.
Energy-storage battery or super capacitor, the direct current being directly connected between variable frequency inverter and four-quadrant PWM rectifier is female
On line；Therefore, energy-storage battery or super capacitor are equivalent to a controlled voltage source, by four-quadrant PWM rectifier is controlled,
Can reasonably, effectively distribute four-quadrant PWM rectifier and the power of two power supplys of super capacitor.Four-quadrant PWM rectifier
For controlling the charging/discharging function of energy-storage battery or super capacitor, it is possible to achieve bi-directional voltage stabilizing exports.When energy-storage battery or super
During electric capacity electric discharge, owing to loading big or energy-storage battery or super capacitor off-capacity, its terminal voltage is caused to decline, and by four
The pressure stabilization function of quadrant PWM rectifier, it is achieved stablizing of DC bus-bar voltage；When energy-storage battery or super capacitor need charging
Time, realize energy-storage battery or the constant voltage of super capacitor or constant-current charge by four-quadrant PWM rectifier；Transfer at electric workover rig
During operation, dc bus being produced surge voltage, its energy can directly be stored in energy-storage battery or super capacitor, right
The charging of energy-storage battery or super capacitor is quick.
Load hydraulic system and pneumatic system on car, be connected to the friendship between four-quadrant PWM rectifier and well site transformator
On stream bus.
Controller, is used for connecting four-quadrant PWM rectifier, variable frequency inverter, super capacitance management system, is used for detecting respectively
The voltage of individual part, current parameters information, and send the operation of command information control various piece.Controller, is whole well workover
The most important link of system, use PLC (Programmable Logic Controller, programmable logic controller (PLC)) or its
It controls device and technology is all connected with above-mentioned various piece, is used for detecting the parameter informations such as each component voltage, electric current, and sends
Command information controls all parts normal safe and runs；During electric workover rig transfers operation, controller is by sampling
The terminal voltage of the voltage, energy-storage battery or the super capacitor that detect and judge on dc bus, feeds back to direct current female by main motor
Energy unnecessary on line directly acts on and charging to energy-storage battery or super capacitor；Or it is fed back to electricity through four-quadrant PWM rectifier
Net, reaches well workover and transfers the safe and stable operation of operation.
Electric power incoming line master switch, on the ac bus being connected between four-quadrant PWM rectifier and well site transformator,
It is connected with controller, controls the switch between four-quadrant PWM rectifier and well site transformator, to control whether electric workover rig makes
Use well site power supply.
Operational mode and the control method of above-mentioned electronic control system of electric workover rig are as follows:
(1) described electric workover rig is in underloading motoring condition: when load current is less than or equal to reference current, four-quadrant
PWM rectifier is controllable constant-current operational mode, and its size of current is equal to the inverter current of real-time online, so, and can be fully sharp
Use electrical network electric energy, extend energy-storage battery or super capacitor service life.
1) energy-storage battery or super capacitor state-of-charge SOC (state ofcharge, state-of-charge) are judged when controller
When reaching 1.0, using four-quadrant PWM rectifier as controlled constant-current source isolated operation, provide DC source for variable frequency inverter；
Energy Flow is as indicated by the arrows of fig. 2.Or,
2) when controller judges energy-storage battery or super capacitor state-of-charge SOC is not up to 1.0, by whole for four-quadrant PWM
While stream device provides DC source as controlled constant-current source for variable frequency inverter, it is directly energy-storage battery or super by bus
Level electric capacity carries out constant-current charge.Energy Flow is as shown by arrows in Figure 3.
(2) described electric workover rig is in heavy duty motoring condition: when load current more than four-quadrant PWM rectifier with reference to electricity
During stream, four-quadrant PWM rectifier is pressed constant current mode and is run, and is inverter supply jointly with super capacitor.
1) when controller judges energy-storage battery or super capacitor electricity abundance, by four-quadrant PWM rectifier and super electricity
Hold both parallel runnings and provide electric energy for variable frequency inverter: by four-quadrant PWM rectifier by constant current mode operation, and its electric current is
Big value is reference current value, and between load current value and reference current value, difference portion is provided by super capacitor；Energy Flow is such as
Shown in the arrow of Fig. 4.Or,
2) when by constant current operational mode, its electric current is reference current value to four-quadrant PWM rectifier, when controller judges
When energy-storage battery or super capacitor electricity are not enough to provide difference between load current value and reference current value, electric workover rig stops
Only operation, presses four-quadrant PWM rectifier constant current mode and runs, be directly charged for energy-storage battery or super capacitor.Energy
Flowing is as indicated by the arrows in fig. 5.
(3) described electric workover rig is in down generating state:
1) judging that electric workover rig main motor is in the time of falling generating state when controller, electric workover rig main motor falls
Generation current is less than energy-storage battery or the restriction of super capacitor charging current and energy-storage battery or super capacitor state-of-charge SOC does not reaches
To 1.0, variable frequency inverter in a dormant state, directly to energy-storage battery or is surpassed by four-quadrant PWM rectifier by dc bus
Level electric capacity charging；Energy Flow is as shown by the arrow in fig. 6.Or,
2) judging that electric workover rig main motor is in the time of falling generating state when controller, electric workover rig main motor falls
Generation current is more than energy-storage battery or the restriction of super capacitor charging current and energy-storage battery or super capacitor state-of-charge SOC does not reaches
To 1.0, four-quadrant PWM rectifier is in feedback grid energy state, by variable frequency inverter by dc bus directly to energy storage
Battery or super capacitor charging；Energy Flow is as shown in the arrow of Fig. 7.Or,
3) judge that electric workover rig main motor is in the time of falling generating state, energy-storage battery or super capacitor lotus when controller
Electricity condition SOC reaches 1.0, and four-quadrant PWM rectifier is in feedback grid energy state；The arrow institute of energy Flow such as Fig. 8
Show.Or,
(4) when the well site power supply of well site transformator does not has electricity, switch is in open position, and described electric workover rig is in orphan
Island state:
1) when controller judges that electric workover rig is in island state, using four-quadrant PWM rectifier as inverter it is
Load hydraulic system and pneumatic system Alternating Current Power Supply on the car of electric workover rig, utilize variable frequency inverter to carry for main motor load
For variable frequency alternating current power source；Energy Flow is as indicated by the arrows in fig. 9.Or,
2) when controller judges that electric workover rig is in island state, using four-quadrant PWM rectifier as inverter it is
Hydraulic system and pneumatic system Alternating Current Power Supply is loaded on the car of electric workover rig；When controller judges electric workover rig main motor
Being in the time of falling generating state, electric workover rig main motor falls generation current less than energy-storage battery or super capacitor charged electrical ductility limit
System and energy-storage battery or super capacitor state-of-charge SOC are not up to 1.0, by variable frequency inverter by dc bus directly to energy storage
Battery or super capacitor charging；Energy Flow is as shown by the arrows in fig. 10.Or,
(5), at the scene in actual motion, when well site transformer capacity is insufficient, and same well site transformator also has other
Pump load works, and owing to hydraulic system main oil pump motor capacity is the biggest on well workover locomotive, arises that hydraulic system
Main oil pump motor start-up capacity inadequate, now, if starting hydraulic system main oil pump motor on car, will affect same
Other pump load work of well site transformator, adjacent motor even load may be worked the mischief by its startup, therefore, can profit
With the inverter power auxiliary hydraulic pressure motor start-up of four-quadrant PWM rectifier, to ensure that energy-accumulated electric switched workover rig system start-up is pacified
Entirely.Energy Flow is as shown in the arrow of Figure 11, and controller is by controlling four-quadrant PWM rectifier, it is achieved well site transformator and four
Quadrant PWM rectifier is jointly for loading the main oil pump motor of hydraulic system on the car of electric workover rig.
Compared with prior art, embodiment of the present invention electric workover rig electric control system has the advantage that
(1) harmonic problem is solved.The application of four-quadrant PWM rectifier, had both decreased the harmonic wave pollution to electrical network, real again
Show the unity power factor of electrical network.
(2) bearing power optimum coordinated allocation problem is solved.The control law of controller can realize energy-storage battery or super
The optimum coordinated allocation that bearing power is changed by level electric capacity and well site power supply.Both will not make well site transformer overload, also will not make
Energy-storage battery or super capacitor overload and the suitable energy-storage battery of design capacity or super capacitor, thus ensure that power supply safety is transported
OK.
(3) electric workover rig generated energy can be fed back to electrical network.When electric workover rig playback weight work, will produce
The biggest raw feedback electric energy.If energy-storage battery or super capacitor charging are full of, by its feedback grid, it is to avoid use it for electricity
Resistance braking consumes, and causes waste of energy.
(4) save two-way DC/DC and be greatly improved the reliability of system, reduce manufacturing cost, save and take up an area space.
(5) braking resistor is heater element, saves braking resistor and is being greatly improved the reliability of system, is reducing the system of production
While causing this and saving occupation of land space, also reclaim substantial amounts of retarding loss energy.
(6), at the scene in actual motion, when well site transformer capacity is insufficient, and same well site transformator also has other
Pump load works, and owing to hydraulic system main oil pump motor capacity is the biggest on well workover locomotive, arises that hydraulic system
Main oil pump motor start-up capacity inadequate, now, if starting hydraulic system main oil pump motor on car, will affect same
Other pump load work of well site transformator, adjacent motor even load may be worked the mischief by its startup, therefore, can profit
With the inverter power auxiliary hydraulic pressure motor start-up of four-quadrant PWM rectifier, to ensure that energy-accumulated electric switched workover rig system start-up is pacified
Entirely.That is: controller is by controlling four-quadrant PWM rectifier, it is achieved well site transformator and four-quadrant PWM rectifier are electronic jointly
The main oil pump motor of hydraulic system is loaded on the car of workover rig.
Those skilled in the art are it will also be appreciated that the various illustrative components, blocks listed of the embodiment of the present invention
(illustrative logical block) unit and step can pass through electronic hardware, computer software, or both combinations
Realize.For clearly showing that the replaceability (interchangeability) of hardware and software, above-mentioned is various illustrative
Parts (illustrative components), unit and step the most universally describe their function.Such function
It is to realize depending on specifically applying the design requirement with whole system by hardware or software.Those skilled in the art can
With for every kind of specific application, it is possible to use the function described in the realization of various methods, but this realization is understood not to surpass
Go out the scope of embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor,
Digital signal processor, special IC (ASIC), field programmable gate array (FPGA) or other programmable logic device,
Discrete gate or transistor logic, discrete hardware components, or the design of any of the above described combination realize or operate described function.
General processor can be microprocessor, alternatively, this general processor can also be any traditional processor, controller,
Microcontroller or state machine.Processor can also realize by calculating the combination of device, such as digital signal processor and micro-
Processor, multi-microprocessor, one or more microprocessors one Digital Signal Processor Core of associating, or any other like
Configuration realize.
It is soft that method described in the embodiment of the present invention or the step of algorithm can be directly embedded into hardware, processor performs
Part module or the combination of both.Software module can be stored in RAM memory, flash memory, ROM memory, EPROM storage
Other any form of storage medium in device, eeprom memory, depositor, hard disk, moveable magnetic disc, CD-ROM or this area
In.Exemplarily, storage medium can be connected with processor, so that processor can read information from storage medium, and
Write information can be deposited to storage medium.Alternatively, storage medium can also be integrated in processor.Processor and storage medium can
To be arranged in ASIC, ASIC can be arranged in user terminal.Alternatively, processor and storage medium can also be arranged at use
In different parts in the terminal of family.
In one or more exemplary designs, the above-mentioned functions described by the embodiment of the present invention can be at hardware, soft
The combination in any of part, firmware or this three realizes.If realized in software, these functions can store and computer-readable
On medium, or it is transmitted on the medium of computer-readable with one or more instructions or code form.Computer readable medium includes electricity
Brain stores medium and is easy to so that allowing computer program transfer to the telecommunication media in other place from a place.Storage medium is permissible
It is that any general or special computer can be with the useable medium of access.Such as, such computer readable media can include but
It is not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other
What may be used for carrying or storage can be by general or special computer or general or special handling with other with instruction or data structure
Device reads the medium of the program code of form.Additionally, any connection can be properly termed computer readable medium, example
As, if software is by coaxial cable, optical fiber computer, double from a web-site, server or other remote resource
Twisted wire, Digital Subscriber Line (DSL) or with the wireless way for transmittings such as the most infrared, wireless and microwave be also contained in defined
In computer readable medium.Described video disc (disk) and disk (disc) include Zip disk, radium-shine dish, CD, DVD, floppy disk
And Blu-ray Disc, disk is generally with magnetic duplication data, and video disc generally carries out optical reproduction data with laser.Combinations of the above
Can also be included in computer readable medium.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect further
Describe in detail, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should comprise
Within protection scope of the present invention.
Patent of the present invention obtains Beijing's Natural Science Fund In The Light Funded Projects (3162025) and supports.
Claims (8)
1. an energy-accumulated electric switched workover rig electric-control system, it is characterised in that described energy-accumulated electric switched workover rig electric-control system includes: arteries and veins
Rush width modulated four-quadrant PWM rectifier, energy-storage battery or super capacitor, energy storage management system, variable frequency inverter, main electronic
Hydraulic system and pneumatic system is loaded, wherein on machine, controller, car:
Described four-quadrant PWM rectifier, is connected with well site transformator, under the effect of four-quadrant PWM control strategy, carries out
Constant voltage exports, or carries out constant current output；
Described variable frequency inverter, is connected with four-quadrant PWM rectifier by dc bus, is used for driving main motor load fortune
OK；
Described energy-storage battery or super capacitor, the direct current being directly connected between variable frequency inverter and four-quadrant PWM rectifier is female
On line, wherein, variable frequency inverter and four-quadrant PWM rectifier are used to control energy-storage battery or the charge and discharge electric work of super capacitor
Can, carry out bi-directional voltage stabilizing output；
Described energy storage management system, is monitored the charging and discharging state within energy-storage battery or super capacitor system；
Described main motor, is connected on the outfan of variable frequency inverter, for driving the mechanical lift systems of workover rig to do work；
Load hydraulic system and pneumatic system on described car, be connected to the friendship between four-quadrant PWM rectifier and well site transformator
On stream bus, for as additional load on car；
Described controller, is used for connecting four-quadrant PWM rectifier, variable frequency inverter, energy-storage battery or super capacitor, energy storage management
System, for detecting the voltage of all parts, current parameters information, and sends the operation of command information control various piece.
2. energy-accumulated electric switched workover rig electric-control system as claimed in claim 1, it is characterised in that described energy-accumulated electric switched workover rig is automatically controlled
System also includes electric power incoming line master switch, described electric power incoming line master switch: is positioned at and is connected to four-quadrant PWM rectifier and well site change
On ac bus between depressor, it is connected with described controller, controls opening between four-quadrant PWM rectifier and well site transformator
Close, to control whether electric workover rig uses well site power supply.
3. energy-accumulated electric switched workover rig electric-control system as claimed in claim 1 or 2, it is characterised in that described energy-accumulated electric switched workover rig
It is in underloading motoring condition:
When controller judges energy-storage battery or super capacitor state-of-charge SOC reaches 1.0, using four-quadrant PWM rectifier as
Controlled constant-current source isolated operation, for variable frequency inverter provide DC source, wherein, four-quadrant PWM rectifier in line current
The electric current required for variable frequency inverter should be equal to；
Or, when controller judges energy-storage battery or super capacitor state-of-charge SOC is not up to 1.0, by four-quadrant PWM rectifier
While providing DC source as controlled constant-current source for variable frequency inverter, directly carry out perseverance for energy-storage battery or super capacitor
Current charge, wherein, four-quadrant PWM rectifier in line current more than the electric current required for variable frequency inverter.
4. energy-accumulated electric switched workover rig electric-control system as claimed in claim 1 or 2, it is characterised in that described energy-accumulated electric switched workover rig
Be in heavy duty motoring condition:
When controller judges energy-storage battery or super capacitor electricity abundance, by four-quadrant PWM rectifier and super capacitor
Parallel running provides electric energy for variable frequency inverter: by four-quadrant PWM rectifier, by constant current mode operation, its electric current is its reference
Current value, energy-storage battery or super capacitor press constant voltage mode run, between load current value and reference current value difference portion by
Energy-storage battery or super capacitor provide；
Or, when when four-quadrant PWM rectifier is run by constant current operational mode, its electric current is reference current value, when controller judges
When energy-storage battery or super capacitor electricity are not enough to provide difference between load current value and reference current value, electric workover rig should
Stop operation, four-quadrant PWM rectifier is run by constant voltage or constant current mode, directly fills for energy-storage battery or super capacitor
Electricity, works on after charging.
5. energy-accumulated electric switched workover rig electric-control system as claimed in claim 1 or 2, it is characterised in that described energy-accumulated electric switched workover rig
It is in down generating state:
When controller judges that electric workover rig main motor is in the time of falling generating state, electric workover rig main motor generates electricity electricity
Stream is less than energy-storage battery or the restriction of super capacitor charging current and energy-storage battery or super capacitor state-of-charge SOC is not up to 1.0
Time, variable frequency inverter in a dormant state, is charged by four-quadrant PWM rectifier directly to energy-storage battery or super capacitor；
Or, when controller judges that electric workover rig main motor is in the time of falling generating state, electric workover rig main motor falls to send out
Electricity electric current is more than energy-storage battery or the restriction of super capacitor charging current and energy-storage battery or super capacitor state-of-charge SOC is not up to
1.0, four-quadrant PWM rectifier is in feedback grid portion of energy state, by variable frequency inverter by dc bus directly to storage
Can battery or super capacitor charging；
Or, when controller, to judge that electric workover rig main motor is in the time of falling generating state, energy-storage battery or super capacitor charged
State SOC reaches 1.0, and four-quadrant PWM rectifier is in feedback grid energy state.
6. energy-accumulated electric switched workover rig electric-control system as claimed in claim 1 or 2, it is characterised in that when the well site of well site transformator
When power supply does not has electricity, main power source service entrance switch is in open position, and described energy-accumulated electric switched workover rig is in island state:
When controller judges that electric workover rig is in island state, it is electronic repairing using four-quadrant PWM rectifier as inverter
The hydraulic system of well machine and pneumatic system Alternating Current Power Supply, utilize variable frequency inverter to provide frequency-changing AC electricity for main motor load
Source；
Or, when controller judges that electric workover rig is in island state, it is electronic using four-quadrant PWM rectifier as inverter
Hydraulic system and pneumatic system Alternating Current Power Supply is loaded on the car of workover rig；When controller judges that electric workover rig main motor is in
The time of falling generating state, electric workover rig main motor fall generation current limit less than energy-storage battery or super capacitor charging current and
Energy-storage battery or super capacitor state-of-charge SOC are not up to 1.0, by variable frequency inverter by dc bus directly to energy-storage battery
Or super capacitor charging；
Or, when controller judges that electric workover rig is in island state, it is electronic using four-quadrant PWM rectifier as inverter
Hydraulic system and pneumatic system Alternating Current Power Supply is loaded on the car of workover rig；When controller judges that electric workover rig main motor is in
The time of falling generating state, electric workover rig main motor fall generation current limit more than energy-storage battery or super capacitor charging current and
Energy-storage battery or super capacitor state-of-charge SOC are not up to 1.0, by variable frequency inverter by dc bus directly to energy-storage battery
Or super capacitor charging.
7. energy-accumulated electric switched workover rig electric-control system as claimed in claim 1 or 2, it is characterised in that fluid pressure motor opens when well site
When dynamic power supply capacity is insufficient, adjacent motor even load may be worked the mischief by its startup, utilizes four-quadrant PWM rectifier
Inverter power auxiliary hydraulic pressure motor start-up, to ensure energy-accumulated electric switched workover rig system start-up safety.
8. as claimed in claim 1 or 2 energy-accumulated electric switched workover rig electric-control system, it is characterised in that when well site transformer capacity not
Time fully, the main oil pump motor start-up capacity of hydraulic system is inadequate, utilizes the inverter power auxiliary liquid of four-quadrant PWM rectifier
Pressure motor start-up, to ensure energy-accumulated electric switched workover rig system start-up safety.
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| CN201610665957.7A CN106208062A (en) | 2016-08-12 | 2016-08-12 | A kind of energy-accumulated electric switched workover rig electric-control system |
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| CN106816870A (en) * | 2016-12-27 | 2017-06-09 | 宁波中车新能源科技有限公司 | A kind of electric workover rig energy-storage system and method |
| CN108166939A (en) * | 2018-02-07 | 2018-06-15 | 山东爱特机电技术有限责任公司 | A kind of pure electric vehicle workover rig |
| CN108316867A (en) * | 2018-02-07 | 2018-07-24 | 山东爱特机电技术有限责任公司 | A kind of pure electric vehicle workover rig |
| CN111600322A (en) * | 2020-03-01 | 2020-08-28 | 青岛能蜂电气有限公司 | Energy storage management method and system for oil pumping unit and electronic equipment |
| CN112003362A (en) * | 2020-07-15 | 2020-11-27 | 滨州学院 | Control method of power supply system and related device |
| CN112234909A (en) * | 2020-10-15 | 2021-01-15 | 宝能(广州)汽车研究院有限公司 | Motor control circuit and motor protection control method of electric vehicle and electric vehicle |
| CN113629850A (en) * | 2021-08-06 | 2021-11-09 | 安徽新诺精工股份有限公司 | Power-off protection system of numerical control machine tool |
| CN114527732A (en) * | 2022-02-22 | 2022-05-24 | 南方电网电力科技股份有限公司 | Four-quadrant power control automatic test system and method for energy storage system |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106816870A (en) * | 2016-12-27 | 2017-06-09 | 宁波中车新能源科技有限公司 | A kind of electric workover rig energy-storage system and method |
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| CN111600322A (en) * | 2020-03-01 | 2020-08-28 | 青岛能蜂电气有限公司 | Energy storage management method and system for oil pumping unit and electronic equipment |
| CN111600322B (en) * | 2020-03-01 | 2021-12-14 | 青岛能蜂电气有限公司 | Energy storage management method and system for oil pumping unit and electronic equipment |
| CN112003362A (en) * | 2020-07-15 | 2020-11-27 | 滨州学院 | Control method of power supply system and related device |
| CN112003362B (en) * | 2020-07-15 | 2023-08-25 | 滨州学院 | Control method of power supply system and related device |
| CN112234909A (en) * | 2020-10-15 | 2021-01-15 | 宝能(广州)汽车研究院有限公司 | Motor control circuit and motor protection control method of electric vehicle and electric vehicle |
| CN113629850A (en) * | 2021-08-06 | 2021-11-09 | 安徽新诺精工股份有限公司 | Power-off protection system of numerical control machine tool |
| CN114527732A (en) * | 2022-02-22 | 2022-05-24 | 南方电网电力科技股份有限公司 | Four-quadrant power control automatic test system and method for energy storage system |
| CN114527732B (en) * | 2022-02-22 | 2023-09-08 | 南方电网电力科技股份有限公司 | Automatic testing system and testing method for four-quadrant power control of energy storage system |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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Application publication date: 20161207 |