CN116581893A - Electric fracturing energy storage system - Google Patents
Electric fracturing energy storage system Download PDFInfo
- Publication number
- CN116581893A CN116581893A CN202310643235.1A CN202310643235A CN116581893A CN 116581893 A CN116581893 A CN 116581893A CN 202310643235 A CN202310643235 A CN 202310643235A CN 116581893 A CN116581893 A CN 116581893A
- Authority
- CN
- China
- Prior art keywords
- energy
- energy storage
- storage device
- fracturing
- electric drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 76
- 238000006243 chemical reaction Methods 0.000 claims abstract description 56
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 8
- 238000011084 recovery Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2607—Surface equipment specially adapted for fracturing operations
-
- 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
- H02J15/00—Systems for storing electric energy
- H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention provides an electrically driven fracturing energy storage system which comprises electrically driven fracturing equipment and an energy storage device, wherein the input ends of the electrically driven fracturing equipment and the energy storage device are connected with a power grid, and the output end of the energy storage device is connected with the input end of the electrically driven fracturing equipment; the energy conversion system comprises a flywheel energy conversion mechanism, a hydraulic energy conversion mechanism and a self-generating mechanism which utilize the main motor in the electric drive fracturing equipment to brake for energy conversion, wherein the output ends of the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism are connected with the input end of an energy storage device.
Description
Technical Field
The invention belongs to the technical field of oilfield fracturing, and particularly relates to an electric drive fracturing energy storage system.
Background
With the large-scale development of fracturing construction, the electric power problem becomes a key problem for restricting the development, taking 70000HHP full-electric drive fracturing platform as an example: sixteen 5000 electric drive fracturing sleds (two spare), two electric sand mixing sleds, two electric instrument sleds, two electric water supply sleds, one electric acid supply sleds, one electric liquid supply sleds and one electric pumping perforating sleds are arranged on the field of the all electric drive fracturing platform, the maximum power load reaches 30000kW when the all electric drive equipment works simultaneously, a 35KV power supply special line is adopted for power supply, compared with resident power, the power consumption difference in the early stage and the later stage of construction is large, the fracturing operation has staged and high peak power consumption, and the power grid utilization rate is not high after the fracturing construction is finished, so that the problem of the power grid utilization rate can be effectively solved by adopting a movable energy storage system.
In the existing electrically driven fracturing system, although the problem of low power grid utilization rate is solved by additionally arranging an energy storage system, when the electrically driven fracturing system is stopped, the driving main motor continues to operate under the action of inertia force until the electrically driven fracturing system is stopped by mechanical friction force, and the time of stopping is longer and the energy loss is larger because the output power and the inertia of the large driving main motor are large.
How to design an electrically driven fracturing energy storage system and how to realize energy recovery and reduce energy consumption of stopping the electrically driven fracturing system is a problem to be solved at present.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an electrically driven fracturing energy storage system, which is used for solving the problem of high energy consumption of the electrically driven fracturing system in the prior art.
In order to achieve the above purpose, the invention provides an electrically driven fracturing energy storage system, which comprises electrically driven fracturing equipment and an energy storage device, wherein the input ends of the electrically driven fracturing equipment and the energy storage device are connected with a power grid, and the output end of the energy storage device is connected with the input end of the electrically driven fracturing equipment;
the energy conversion system comprises a flywheel energy conversion mechanism, a hydraulic energy conversion mechanism and a self-generating mechanism, wherein the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism are used for performing energy conversion by utilizing braking of a main motor in the electric drive fracturing equipment, and the output ends of the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism are connected with the input end of the energy storage device.
By adopting the technical scheme: the energy storage device is arranged to provide power for the electrically driven fracturing equipment, so that the power is provided for the electrically driven fracturing equipment together, and the energy storage device can continuously provide power for the electrically driven fracturing equipment for a certain time when a power grid fails and is powered off in the fracturing operation process, so that the electrically driven fracturing equipment can be used for treating accidents; in the non-fracturing operation time, the power grid directly charges the energy storage device, so that the effects of adjusting electricity price, peak clipping and valley filling can be achieved; the energy conversion system is arranged to convert the main motor braking mechanical energy in the electric drive fracturing equipment into other forms of energy to be transmitted to the energy storage device for storage through the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism respectively, and the energy can be directly supplied to the electric drive fracturing equipment for use through the energy storage device subsequently, so that the recovery and the utilization of the main motor braking mechanical energy in the electric drive fracturing equipment are realized, and the energy loss caused by shutdown of the electric drive fracturing system is reduced.
In an embodiment of the present invention, the system further includes a controller, where the controller is connected to the electrically driven fracturing device, the energy conversion system, and the energy storage device, respectively, and controls the electrically driven fracturing device, the energy conversion system, and the energy storage device connected thereto through the controller.
By adopting the technical scheme: the controller is used for monitoring the running state of the electrically-driven fracturing equipment to automatically control the energy conversion system and the energy storage device, so that the automation of energy recycling is realized.
In an embodiment of the present invention, the energy storage device is configured to store and release, to the electrically driven fracturing device, energy obtained by converting main motor braking mechanical energy in the electrically driven fracturing device and electrical energy obtained by the electrical grid.
By adopting the technical scheme: all the energy can be integrated, and the energy can be supplied to the electrically-driven fracturing equipment directly through the energy storage device.
In an embodiment of the invention, the flywheel energy conversion mechanism body is a flywheel generator, and a flywheel of the flywheel generator rotates along with an output shaft of a main motor in the electrically-driven fracturing equipment, and the flywheel is utilized to rotate by inertia to drive the generator to generate electricity when the main motor of the electrically-driven fracturing equipment is braked.
By adopting the technical scheme: the main motor in the electric drive fracturing equipment can drive the flywheel to rotate at a high speed during operation, and the flywheel can continuously rotate under the action of self inertia when the main motor brakes, so that the generator is driven to generate electricity and is conducted to the energy storage device to store energy, and the utilization of the shutdown inertial energy of the electric drive fracturing equipment is realized.
In an embodiment of the invention, the hydraulic energy conversion mechanism is used for converting energy in the main motor into compression energy and transmitting the compression energy to the energy storage device for storage when the main motor in the electrically driven fracturing equipment is braked.
By adopting the technical scheme: when the hydraulic energy conversion mechanism brakes a main motor in the electrically driven fracturing equipment, the energy in the electrically driven fracturing equipment is converted into compression energy to be stored, when the electrically driven fracturing equipment runs again, the compression energy can be converted into hydraulic pressure and pneumatic pressure energy to be released, the hydraulic energy conversion mechanism drives the electrically driven fracturing equipment to run together with the main motor, and when the instantaneous pressure of the electrically driven fracturing equipment system increases, the hydraulic energy conversion mechanism can absorb the energy of the part so as to ensure that the pressure of the whole electrically driven fracturing equipment system is normal.
In an embodiment of the present invention, the self-generating mechanism is configured to perform self-generation of the main motor by using a drag torque generated when the main motor in the electrically driven fracturing device is braked.
By adopting the technical scheme: when the electric drive fracturing equipment receives a braking instruction and brakes, the main motor is converted into a braking mode from a driving mode to enable the main motor to generate negative torque to participate in braking force distribution of self braking when the electric drive fracturing equipment is in full of energy recovery starting conditions, meanwhile, a transmission shaft of the main motor drives a rotor of the main motor to cut a stator magnetic induction wire under the inertia effect along with a fracturing pump shaft in the braking force distribution process of the main motor, the working characteristic enables the main motor to serve as a generator in the braking process, energy lost is converted into electric energy to be transmitted and stored into an energy storage device, the purpose of energy recovery is achieved, energy waste can be reduced, and abrasion of a brake pad can be reduced.
As described above, the electrically driven fracturing energy storage system has the following beneficial effects: on the basis of setting an energy storage device, an energy conversion system is additionally arranged to recycle the braking mechanical energy of a main motor in the electrically-driven fracturing equipment in cooperation with the energy storage device, so that the purpose of reducing the energy stopping energy of the electrically-driven fracturing system is achieved; the popularization and application have good economic benefit and social benefit.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Referring to fig. 1, an electrically driven fracturing energy storage system comprises electrically driven fracturing equipment and an energy storage device, wherein the input ends of the electrically driven fracturing equipment and the energy storage device are connected with a power grid, and the output end of the energy storage device is connected with the input end of the electrically driven fracturing equipment; the energy storage device is arranged to provide power for the electrically driven fracturing equipment, so that the power is provided for the electrically driven fracturing equipment together, and the energy storage device can continuously provide power for the electrically driven fracturing equipment for a certain time when a power grid fails and is powered off in the fracturing operation process, so that the electrically driven fracturing equipment can be used for treating accidents; in the non-fracturing operation time, the power grid directly charges the energy storage device, so that the effects of adjusting electricity price, peak clipping and valley filling can be achieved.
The energy conversion system comprises a flywheel energy conversion mechanism, a hydraulic energy conversion mechanism and a self-generating mechanism which utilize the braking of the main motor in the electric drive fracturing equipment to perform energy conversion, wherein the output ends of the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism are connected with the input end of the energy storage device; the energy conversion system is arranged to convert the main motor braking mechanical energy in the electric drive fracturing equipment into other forms of energy to be transmitted to the energy storage device for storage through the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism respectively, and the energy can be directly supplied to the electric drive fracturing equipment for use through the energy storage device subsequently, so that the recovery and the utilization of the main motor braking mechanical energy in the electric drive fracturing equipment are realized, and the energy loss caused by shutdown of the electric drive fracturing system is reduced.
The energy storage device comprises an energy storage device, an electric drive fracturing device, an energy conversion system and a controller, wherein the energy storage device is connected with the energy storage device; the controller is used for monitoring the running state of the electrically-driven fracturing equipment to automatically control the energy conversion system and the energy storage device, so that the automation of energy recycling is realized.
Further, the energy storage device is used for storing and releasing energy obtained by converting main motor braking mechanical energy in the electric drive fracturing equipment and electric energy obtained by a power grid to the electric drive fracturing equipment; all the energy can be integrated, and the energy can be supplied to the electrically-driven fracturing equipment directly through the energy storage device.
Further, the flywheel energy conversion mechanism main body is a flywheel generator, a flywheel of the flywheel generator rotates along with an output shaft of a main motor in the electric drive fracturing equipment, and the flywheel is used for driving the generator to generate electricity by utilizing inertial rotation of the flywheel when the main motor of the electric drive fracturing equipment is braked; the main motor in the electric drive fracturing equipment can drive the flywheel to rotate at a high speed during operation, and the flywheel can continuously rotate under the action of self inertia when the main motor brakes, so that the generator is driven to generate electricity and is conducted to the energy storage device to store energy, and the utilization of the shutdown inertial energy of the electric drive fracturing equipment is realized.
Further, when the main motor in the electrically driven fracturing equipment is braked, the hydraulic energy conversion mechanism converts energy in the electrically driven fracturing equipment into compression energy to be stored, when the electrically driven fracturing equipment is operated again, the compression energy can be converted into hydraulic pressure and pneumatic pressure energy to be released, the hydraulic energy conversion mechanism and the main motor drive the electrically driven fracturing equipment to operate together, and when the instantaneous pressure of the electrically driven fracturing equipment system is increased, the hydraulic energy conversion mechanism can absorb the energy of the part so as to ensure that the pressure of the whole electrically driven fracturing equipment system is normal.
Further, the self-generating mechanism is used for self-generating of the main motor by utilizing a drag torque generated when the main motor in the electric drive fracturing equipment is braked; when the electric drive fracturing equipment receives a braking instruction and brakes, the main motor is converted into a braking mode from a driving mode to enable the main motor to generate negative torque to participate in braking force distribution of self braking when the electric drive fracturing equipment is in full of energy recovery starting conditions, meanwhile, a transmission shaft of the main motor drives a rotor of the main motor to cut a stator magnetic induction wire under the inertia effect along with a fracturing pump shaft in the braking force distribution process of the main motor, the working characteristic enables the main motor to serve as a generator in the braking process, energy lost is converted into electric energy to be transmitted and stored into an energy storage device, the purpose of energy recovery is achieved, energy waste can be reduced, and abrasion of a brake pad can be reduced.
When the electric drive fracturing equipment is in specific implementation, the electric network is taken as a main part, the energy storage device is taken as an auxiliary part, and power is supplied to the electric drive fracturing equipment together; in the non-fracturing operation time, the power grid charges the energy storage device, so that the energy storage device is guaranteed to be electrified, and meanwhile, the energy storage device can be matched to play roles in adjusting electricity price and peak clipping and valley filling; when the electric drive fracturing equipment is stopped, the energy conversion system can convert braking mechanical energy generated by the main motor in the electric drive fracturing equipment and transmit the braking mechanical energy to the energy storage device for energy storage, so that the electric drive fracturing equipment is conveniently and subsequently supplied again for use, and the effects of energy recycling and stopping power consumption reduction are realized.
In summary, the electrically driven fracturing energy storage system has the following beneficial effects: on the basis of setting an energy storage device, an energy conversion system is additionally arranged to recycle the braking mechanical energy of a main motor in the electrically-driven fracturing equipment in cooperation with the energy storage device, so that the purpose of reducing the energy stopping energy of the electrically-driven fracturing system is achieved; the popularization and application have good economic benefit and social benefit. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (6)
1. An electrically driven fracturing energy storage system, characterized in that: the electric drive fracturing device comprises electric drive fracturing equipment and an energy storage device, wherein the input ends of the electric drive fracturing equipment and the energy storage device are connected with a power grid, and the output end of the energy storage device is connected with the input end of the electric drive fracturing equipment;
the energy conversion system comprises a flywheel energy conversion mechanism, a hydraulic energy conversion mechanism and a self-generating mechanism, wherein the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism are used for performing energy conversion by utilizing braking of a main motor in the electric drive fracturing equipment, and the output ends of the flywheel energy conversion mechanism, the hydraulic energy conversion mechanism and the self-generating mechanism are connected with the input end of the energy storage device.
2. An electrically driven fracturing energy storage system according to claim 1, characterized in that: the device comprises an electric drive fracturing device, an energy conversion system and an energy storage device, and is characterized by further comprising a controller which is respectively connected with the electric drive fracturing device, the energy conversion system and the energy storage device and controls the electric drive fracturing device, the energy conversion system and the energy storage device which are connected with the controller.
3. An electrically driven fracturing energy storage system according to claim 1, characterized in that: the energy storage device is used for storing and releasing energy obtained by converting main motor braking mechanical energy in the electrically-driven fracturing equipment and electric energy obtained by a power grid to the electrically-driven fracturing equipment.
4. An electrically driven fracturing energy storage system according to claim 1, characterized in that: the flywheel energy conversion mechanism body is a flywheel generator, a flywheel of the flywheel generator rotates along with an output shaft of a main motor in the electric drive fracturing equipment, and the flywheel is utilized to rotate to drive the generator to generate electricity when the main motor of the electric drive fracturing equipment is braked.
5. An electrically driven fracturing energy storage system according to claim 1, characterized in that: the hydraulic energy conversion mechanism is used for converting energy in the main motor into compression energy and transmitting the compression energy to the energy storage device for storage when the main motor in the electrically driven fracturing equipment is braked.
6. An electrically driven fracturing energy storage system according to claim 1, characterized in that: the self-generating mechanism is used for self-generating of the main motor by utilizing the drag torque generated when the main motor in the electrically-driven fracturing equipment brakes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310643235.1A CN116581893A (en) | 2023-06-01 | 2023-06-01 | Electric fracturing energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310643235.1A CN116581893A (en) | 2023-06-01 | 2023-06-01 | Electric fracturing energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116581893A true CN116581893A (en) | 2023-08-11 |
Family
ID=87537716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310643235.1A Withdrawn CN116581893A (en) | 2023-06-01 | 2023-06-01 | Electric fracturing energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116581893A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2023
- 2023-06-01 CN CN202310643235.1A patent/CN116581893A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106274444A (en) | Engineering machinery series-parallel connection dynamical system | |
| RU2012156129A (en) | ROCK DRILLING RIG AND METHOD FOR MOVING DOWN ON A SLOPE | |
| CN116581893A (en) | Electric fracturing energy storage system | |
| CN202138972U (en) | Mechanical drilling rig winch brake energy recovering and recycling device | |
| CN105253028A (en) | Control method and device for hybrid power supply stroke-adding type electric vehicle | |
| CN107152378A (en) | A kind of vertical-shaft wind machine rotor rotating energy conversion device and its application method | |
| CN203294993U (en) | Energy-saving lifting device of steel wire rope type lifting machine for construction | |
| CN203411283U (en) | Jack with rolling ball screw | |
| CN201896799U (en) | Wheel crane and hydraulic control system thereof and pump/motor control loop thereof | |
| CN204098776U (en) | Diesel generating set and flywheel energy storage micro-grid system | |
| CN205113038U (en) | Composite power source increases controlling means of form electric motor car | |
| CN220210022U (en) | Electric fracturing energy storage system | |
| CN205004755U (en) | Energy-saving device for recycling and reusing common alternating current bus | |
| CN205905800U (en) | Electric motor car energy recuperation device, system and electric motor car | |
| CN201730565U (en) | Energy recycling device for petroleum drilling machine | |
| CN203596655U (en) | Bicycle brake energy recuperation apparatus | |
| CN204103484U (en) | A kind of oil-well rig DC micro power grid system | |
| CN102080675A (en) | Wheeled crane and hydraulic control system and pump/motor control circuit thereof | |
| CN212893642U (en) | Vehicle-mounted oil drilling machine | |
| CN203691133U (en) | Flywheel energy-saving power generator on self-propelled trolley | |
| CN112829582A (en) | Vehicle power generation system and power generation method | |
| CN204226106U (en) | A kind of wind-driven generator | |
| CN211287968U (en) | Speed increaser system applied to concentrated wind energy type vertical shaft wind power generation system | |
| CN212572095U (en) | Energy-saving device of beam-pumping unit | |
| CN205986678U (en) | Use well drilling variable -frequency driving system of double layer capacitor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20230811 |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Aois Ocean Engineering (Shanghai) Co.,Ltd. Person in charge of patents Document name: Notice of Qualified Procedures |