Grid power capacity-increasing power supply system for fracturing operation

Abstract

The utility model discloses a grid power capacity-increasing power supply system for fracturing operation, comprising an AC / DC energy storage device comprising a DC port and an AC port; the alternating current port is connected to an alternating current bus, the alternating current bus is connected with a mains supply power grid, and the alternating current bus is further connected with fracturing equipment; the direct-current port is connected to the direct-current bus, the direct-current bus is connected with a sand mixing pump through a DC / AC converter I, and the alternating-current bus is connected to the direct-current bus through a transformer I and an AC / DC converter to supply power to the sand mixing pump. The system can improve the power supply stability, reduce the equipment investment, and reduce the equipment operation and maintenance cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply for fracturing platforms, and particularly relates to a network power capacity increasing power supply system for fracturing operations. Background Technique

[0002] Currently, for fracturing operation platforms, diesel-driven pumps are mainly used as backup power sources. Due to the small displacement of diesel-driven pumps, large number of supporting units, high rental costs, high equipment investment, high maintenance costs, the need for regular oil and filter replacements, high fuel consumption, poor economic efficiency and environmental unfriendliness. The start-up of diesel-driven pump sets takes time, which leads to the inability to provide power in a timely manner after a power outage during all-electric drive fracturing, easily causing sand blockage in the well and bringing safety risks to fracturing operations. For general grid-connected energy storage systems, it is impossible to quickly switch from the grid-connected state to supplying power to a load with an extremely large off-grid voltage and fluctuations in a short time during grid-connected and off-grid switching. This leads to the situation that once a power outage occurs during the fracturing process, the diesel drive cannot be immediately connected to supply power, causing sand blockage accidents and huge economic losses to the fracturing platform. Content of the Utility Model

[0003] In order to overcome the deficiencies of existing technical methods, the purpose of the utility model is to propose a network power capacity increasing power supply system for fracturing operations, which can improve power supply stability, reduce equipment investment, and reduce equipment operation and maintenance costs.

[0004] To achieve the above objectives, the technical solution adopted by the utility model is: a network power capacity increasing power supply system for fracturing operations, including: an AC-DC energy storage device, including a DC port and an AC port; the AC port is connected to an AC bus, on which a mains power grid is connected, and a fracturing device is also connected to the AC bus; the DC port is connected to a DC bus, and a sand mixing pump is connected to the DC bus through a DC / AC converter I, and the AC bus is connected to the DC bus through a transformer I and an AC / DC converter to supply power to the sand mixing pump.

[0005] Furthermore, the AC-DC energy storage device includes a storage battery, a DC / DC converter, and a bidirectional DC / AC converter. The storage battery is respectively connected to the first DC terminal of the DC / DC converter and the DC terminal of the bidirectional DC / AC converter. The second DC terminal of the DC / DC converter serves as the DC port, and the AC terminal of the bidirectional DC / AC converter serves as the AC port through a transformer II.

[0006] Furthermore, the mains power grid is respectively connected to a switch 2 and a switch 3 through a switch 1 and a grid transformer. The switch 2 is connected to the AC bus, and the switch 3 is connected to the fracturing device; a switch 4 is provided at the DC port, a switch 5 is provided at the AC port, and a switch 6 is provided at the AC terminal of the AC / DC converter.

[0007] Furthermore, the output end of the transformer I is also connected to the basic electrical equipment.

[0008] Furthermore, a switch 7 is provided at the power supply end of the basic electrical equipment.

[0009] Beneficial effects of adopting this technical solution:

[0010] After the energy storage is connected to the grid, during grid connection, it charges at night and can achieve grid connection and load carrying during the day, realizing peak-valley arbitrage, reducing the electricity cost of the fracturing platform operation, and can replace the standby diesel-driven pump set, reducing the equipment purchase cost and operation and maintenance cost, saving energy and improving economic benefits. When the power grid is powered off, it automatically switches to off-grid and serves as a backup power supply, driving two 6000HP fracturing electric pumps to remove sand, preventing sand blockage, and ensuring the safety of the fracturing platform operation.

[0011] Technical effects brought: 1) Obtain the peak-valley price difference, replace the diesel-driven pump, and reduce costs and increase efficiency for the fracturing platform; 2) Configure a millisecond-level grid-connected and off-grid switching system, which can switch the energy storage system from the grid-connected standby state to off-grid load carrying in milliseconds, improving the reliability of the power supply system; 3) Increase the capacity of the commercial power, and can discharge the fracturing platform in parallel with the commercial power synchronously. When the commercial power is powered off, it can discharge the fracturing platform alone to prevent operation accidents. 4) Provide a backup power supply for the sand mixing pump through the energy storage system, and can supply power to the sand mixing pump in time when the commercial power is cut off, ensuring the emergency treatment of the well site. The energy storage system is connected to the commercial power fracturing platform, which can realize functions such as seamless switching, standby replacement, peak-valley arbitrage, and fast backup power switching, and will be a more reliable and energy-saving fracturing platform power supply system. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the principle of a network power capacity increase power supply system for fracturing operations of the present utility model;

[0013] Figure 2 It is a schematic diagram of the principle of the AC-DC energy storage device of the present utility model;

[0014] Figure 3 It is a schematic diagram of the principle of a network power capacity increase power supply system for fracturing operations in an optimized embodiment of the present utility model;

[0015] Among them, 1 is the AC-DC energy storage device, 2 is the AC bus, 3 is the commercial power grid, 4 is the fracturing equipment, 5 is the DC bus, 6 is the DC / AC converter I, 7 is the sand mixing pump, 8 is the transformer I, 9 is the AC / DC converter, 10 is the basic electrical equipment, 11 is the switch 1, 12 is the switch 2, 13 is the switch 3, 14 is the switch 4, 15 is the switch 5, 16 is the switch 6, 17 is the switch 7; 101 is the storage battery, 102 is the DC / DC converter, 103 is the bidirectional DC / AC converter, 104 is the transformer II. Detailed Implementation Modes

[0016] In order to make the purpose, technical solutions and advantages of the utility model clearer, the following further elaborates the utility model in conjunction with the accompanying drawings.

[0017] In this embodiment, as shown in Figure 1 a network power capacity increase power supply system for fracturing operations includes: an AC / DC energy storage device 1, including a DC port and an AC port; the AC port is connected to an AC bus 2, on which a commercial power grid 3 is connected, and a fracturing device 4 is also connected to the AC bus 2; the DC port is connected to a DC bus 5, and a sand mixing pump 7 is connected to the DC bus 5 through a DC / AC converter I 6, and the AC bus 2 is connected to the DC bus 5 through a transformer I 8 and an AC / DC converter 9 to supply power to the sand mixing pump 7.

[0018] As an optimized solution of the above embodiment, the AC / DC energy storage device 1 includes a storage battery 101, a DC / DC converter 102 and a bidirectional DC / AC converter 103. The storage battery 101 is respectively connected to the first DC end of the DC / DC converter 102 and the DC end of the bidirectional DC / AC converter 103. The second DC end of the DC / DC converter 102 serves as the DC port, and the AC end of the bidirectional DC / AC converter 103 serves as the AC port through a transformer II 104.

[0019] The AC charge and discharge circuits of the energy storage are shared. The discharge circuit and the charge circuit of the bidirectional DC / AC are directly connected to the AC bus 2. Under normal circumstances of the commercial power, the energy storage automatically replenishes electricity or is in the grid-connected standby state. When a commercial power failure is detected, the energy storage switches to the off-grid state.

[0020] As an optimized solution of the above embodiment, the commercial power grid 3 is respectively connected to a switch 212 and a switch 313 through a switch 111 and a grid transformer. The switch 212 is connected to the AC bus 2, and the switch 313 is connected to the fracturing device 4; a switch 414 is provided at the DC port and a switch 515 is provided at the AC port, and a switch 616 is provided at the AC end of the AC / DC converter 9.

[0021] The switch 111, the switch 212 and the switch 313 can be closed simultaneously, and the commercial power can supply power to the energy storage and the fracturing platform simultaneously through the switch 111, the switch 212, the switch 313 and the opened switch 515.

[0022] Power supply for the sand mixing pump 7: Switches 111, 212, 616, and 414 are turned on, and it is powered by both the energy storage and the power grid simultaneously; alternatively, the sand mixing pump 7 is turned on by the mains switches 111, 212, and 616 and is powered by the power grid. When the mains power grid 3 loses power for switches 111, 313, and 616, it is solely supported by the energy storage. Switch 414 is turned on to supply power for the sand mixing pump 7 to prevent malfunctions of the sand mixing pump 7.

[0023] When the grid voltage is abnormal, switch 111 is disconnected, and the energy storage's AC circuit provides high-power AC power to supply the sand discharge of the fracturing electric drive pump.

[0024] As an optimized solution for the above embodiment, as Figure 3 shown, the output end of the transformer I 8 is also connected to the basic electrical equipment 10 to facilitate the power consumption of other basic electrical equipment 10 in the system, such as household appliances, etc.

[0025] Preferably, a switch 717 is provided at the power supply end of the basic electrical equipment 10 to control whether to supply power to the basic electrical equipment 10.

[0026] To better understand the present invention, the working principle of the present invention will be described completely as follows:

[0027] The power grid and the AC end of the energy storage jointly supply power to the AC bus 2, and the AC bus 2 supplies power to the fracturing equipment 4.

[0028] The power grid and the DC end of the energy storage jointly or separately use the DC end of the energy storage to supply power to the sand mixing pump 7.

[0029] The power grid charges the energy storage battery through the AC end of the energy storage.

[0030] For the fracturing equipment 4 with mains power access, through the access of the energy storage, on the one hand, the time-shifting ability of the energy storage can be utilized to obtain peak-valley price differences; using the energy storage to replace diesel to drive the fracturing equipment 4 to meet the power consumption requirements of all-electric fracturing can reduce equipment investment and equipment operation and maintenance costs; charging is carried out during the valley period at night or during the fracturing gap during the day; during fracturing, it is connected in parallel with the power grid to provide electric energy to solve the problem of insufficient grid capacity. Taking advantage of the background of peak-valley price differences and high diesel power generation costs, good economic benefits can be achieved.

[0031] On the other hand, the energy storage can drive the sand mixing pump 7 through the DC / DC module and the mains power in a primary and secondary backup manner. When the mains power is normal, the sand mixing pump 7 is powered by the mains power. When the mains power experiences unplanned or planned outages, the energy storage can supply power to the sand mixing pump 7 alone to ensure the normal use of the sand mixing pump 7.

[0032] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A network power capacity-increasing power supply system for fracturing operations, characterized in that, Comprising: An AC-DC energy storage device, including a DC port and an AC port; the AC port is connected to the AC busbar, on which a mains power grid is connected, and a fracturing device is also connected to the AC busbar; the DC port is connected to the DC busbar, and a sand mixing pump is connected to the DC busbar through a DC / AC converter I, and the AC busbar is connected to the DC busbar through a transformer I and an AC / DC converter to supply power to the sand mixing pump.

2. The network power capacity increase power supply system for fracturing operations according to claim 1, wherein The AC-DC energy storage device includes a battery, a DC / DC converter, and a bidirectional DC / AC converter. The battery is respectively connected to the first DC terminal of the DC / DC converter and the DC terminal of the bidirectional DC / AC converter. The second DC terminal of the DC / DC converter serves as the DC port, and the AC terminal of the bidirectional DC / AC converter serves as the AC port through a transformer II.

3. A network power capacity increase power supply system for fracturing operations according to claim 1, characterized in that, The mains power grid is respectively connected to a switch 2 and a switch 3 through a switch 1 and a grid transformer. The switch 2 is connected to the AC busbar, and the switch 3 is connected to the fracturing device; a switch 4 is provided at the DC port and a switch 5 is provided at the AC port, and a switch 6 is provided at the AC terminal of the AC / DC converter.

4. A network power capacity increasing power supply system for fracturing operations according to any one of claims 1-3, characterized in that The output terminal of the transformer I is also connected to basic electrical equipment.

5. The network power capacity increasing power supply system for fracturing operation according to claim 4, wherein A switch 7 is provided at the power supply terminal of the basic electrical equipment.

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