Power grid drilling energy storage system
By introducing energy storage devices and bidirectional converters into grid-powered drilling platforms, combined with STS switches and transformers, the high cost and unstable power supply problems caused by diesel generator sets were solved, energy recovery and rapid switching were achieved, and the safety and economy of drilling operations were improved.
Patent Information
- Application Number
- CN202422006097.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-08-19
AI Technical Summary
Existing grid-powered drilling platforms use diesel generator sets as backup power sources, resulting in high equipment investment and high operation and maintenance costs. Power cannot be restored promptly in the event of a mains power failure, posing a safety risk. Furthermore, the energy storage system cannot recover potential energy during drilling operations, reducing economic efficiency and extending switching time.
An energy storage device is used, including a battery, a bidirectional DC/DC converter, and a DC/AC converter. The bidirectional DC/DC converter is connected to the DC bus of the drilling platform. The discharge circuit of the DC/AC converter is connected to the AC bus and connected to the mains power grid through an STS switch. Multiple switches are set to control the flow of power. The drilling power supply platform is combined with a transformer and a diesel generator set to achieve energy recovery and rapid switching.
Reduce equipment purchase and operation and maintenance costs, improve economic benefits, achieve energy recovery, ensure the safety of drilling operations and the reliability of the power supply system, quickly switch to backup power, avoid startup delays of diesel generator sets, and improve the safety and economy of drilling operations.
Smart Images
Figure CN223414599U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of drilling equipment, and in particular relates to a grid-electric drilling energy storage system. Background Art
[0002] Currently, grid-connected drilling platforms primarily use diesel generators as backup power sources, resulting in high equipment investment and high operation and maintenance costs. Diesel generators take time to start up, which means that power cannot be restored promptly in the event of a mains power failure, posing a safety risk to drilling operations.
[0003] Generally, energy storage systems are connected to the DC bus directly through a converter for energy storage and power supply. This results in the inability to recover the potential energy during drilling operations, reducing economic efficiency and extending the system's load switching time from grid-connected to off-grid. Utility Model Content
[0004] In order to overcome the shortcomings of the existing technical methods, the purpose of the utility model is to propose a grid-electric drilling energy storage system that can utilize the energy storage device to assist the drilling power supply platform while recovering the potential energy during the drilling operation, reducing economic costs and improving switching efficiency.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a grid-powered drilling energy storage system, comprising: an energy storage device and a drilling power supply platform; the energy storage device includes a battery, a bidirectional DC / DC converter, and a DC / AC converter, the battery is connected to the bidirectional DC / DC converter and the DC / AC converter respectively, the bidirectional DC / DC converter is connected to the DC bus of the drilling platform, the discharge circuit of the DC / AC converter is connected to the AC bus of the drilling platform, and the charging circuit of the DC / AC converter is connected to the mains power grid through an STS switch.
[0006] Furthermore, a switch I is provided on the connection line between the bidirectional DC / DC converter and the DC bus of the drilling platform, a switch II is provided on the connection line between the DC / AC converter and the AC bus of the drilling platform, and a switch III is provided on the connection line between the STS switch and the mains power grid.
[0007] Furthermore, a transformer is provided at the AC end of the DC / AC converter.
[0008] Furthermore, a main power storage switch is provided at the rear end of the battery.
[0009] Furthermore, the drilling power supply platform includes a diesel generator set, a DC bus, an AC-DC converter, an AC bus, a load power supply converter and a load. The diesel generator set generates electricity and outputs it to the DC bus. The DC bus is connected to the AC bus through the AC-DC converter, and the AC bus is connected to the load through the load power supply converter.
[0010] The beneficial effects of adopting this technical solution are:
[0011] The energy storage access solution proposed in this utility model can obtain the peak-valley price difference of the power grid, reduce the electricity cost of drilling operations, and can replace the standby diesel generator set, reduce equipment purchase cost and operation and maintenance cost, save energy, and improve economic benefits.
[0012] The utility model can realize the mixed use of AC and DC by improving the rectifier and inverter structure of the energy storage device, and can recover the potential energy such as the drawworks lowering during the drilling operation, which can further improve the energy-saving effect and broaden the application scenarios.
[0013] This utility model is equipped with an STS switching switch, which can enable the energy storage system to switch from grid-connected standby state to off-grid load in milliseconds. The energy storage is superior to diesel generator sets in terms of backup power switching time and adjustment speed, which can better ensure the stability of the drilling power supply system, improve the safety of drilling operations, and improve the reliability of the power supply system.
[0014] This utility model uses an energy storage system with a bidirectional AC / DC and DC / DC rectifier inverter structure to connect to the grid-powered drilling platform. On the one hand, it can recover the potential energy of the drilling platform under working conditions such as drilling. On the other hand, it can directly supply power to the DC bus of the drilling platform to ensure that equipment such as the winch can be safely shut down in the event of an AC power failure. It can realize functions such as energy recovery, standby replacement, peak-valley arbitrage, and rapid backup power switching, which will be a more reliable and energy-saving drilling power supply system. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the principle of a grid-electric drilling energy storage system of the utility model;
[0016] Figure 2 This is a schematic diagram of the principle of the energy storage device in the embodiment of the utility model;
[0017] Among them, 1 is the energy storage device, 2 is the drilling power supply platform, 3 is the mains power grid, 11 is the battery, 12 is the bidirectional DC / DC converter, 13 is the DC / AC converter, 14 is the STS switch, 15 is switch I, 16 is switch II, 17 is switch III, 18 is the transformer, 21 is the diesel generator set, 22 is the DC bus, and 23 is the AC bus. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model is further described below with reference to the accompanying drawings.
[0019] In this embodiment, see Figure 1-Figure 2As shown, a grid-powered drilling energy storage system includes: an energy storage device 1 and a drilling power supply platform 2; the energy storage device 1 includes a battery 11, a bidirectional DC / DC converter 12 and a DC / AC converter 13, the battery 11 is connected to the bidirectional DC / DC converter 12 and the DC / AC converter 13 respectively, the bidirectional DC / DC converter 12 is connected to the DC bus 22 of the drilling platform, the discharge circuit of the DC / AC converter 13 is connected to the AC bus 23 of the drilling platform, and the charging circuit of the DC / AC converter 13 is connected to the mains power grid 3 through the STS switch 14.
[0020] As an optimization solution of the above embodiment, a switch I 15 is provided on the connection line between the bidirectional DC / DC converter 12 and the drilling platform DC bus 22, a switch II 16 is provided on the connection line between the DC / AC converter 13 and the drilling platform AC bus 23, and a switch III 17 is provided on the connection line between the STS switch 14 and the mains power grid 3.
[0021] Switch II16 and switch III17 can be closed at the same time, and the mains power can be supplied to the energy storage and drilling platform at the same time through switch II16 and switch III17;
[0022] Under normal circumstances, the switch I15 is in a closed state, and the potential energy of the load winch and other equipment of the drilling power supply platform 2 can be recovered and stored at any time through DC / DC conversion.
[0023] Preferably, a transformer 18 is provided at the AC end of the DC / AC converter 13 to adjust the AC voltage level output by the DC / AC converter 13 to comply with the DC bus 22 or the mains power grid 3 .
[0024] Preferably, a main power switch is provided at the rear end of the battery 11 for switching the idle battery 11 on and off.
[0025] As an optimization of the above embodiment, the drilling power supply platform 2 includes a diesel generator set 21, a DC bus 22, an AC / DC converter, an AC bus 23, a load power converter, and a load. The diesel generator set 21 generates power and outputs it to the DC bus 22. The DC bus 22 is connected to the AC bus 23 via the AC / DC converter, and the AC bus 23 is connected to the load via the load power converter. The load power converter is matched to the load. For example, for a DC load, the load power converter is a DC / DC converter, while for an AC load, the load power converter is a DC / AC converter 13.
[0026] In order to better understand the present invention, the following is a complete description of the working principle of the present invention:
[0027] The energy storage device 1 has bidirectional DC / DC and DC / AC conversion functions.
[0028] The DC / DC is connected to the platform's 810V DC bus 22. Its purpose is to absorb the potential energy of equipment such as the winch, and to provide emergency power to key equipment such as the winch in the event of a mains failure or an AC power supply circuit failure, allowing the winch and other equipment to shut down safely and ensure the safety of the equipment and the well.
[0029] The energy storage AC charging and discharging circuits are set separately. The DC / AC discharge circuit is directly connected to the platform's 600V AC bus 23, and the charging circuit is connected to the mains through the STS. When the mains power is normal, the energy storage automatically replenishes power or enters the grid-connected standby state. When a mains power failure is detected, the energy storage automatically switches to an off-grid state.
[0030] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.
Claims
1. A grid-electric drilling energy storage system, characterized in that: include: Energy storage device and drilling power supply platform; the energy storage device includes a battery, a bidirectional DC / DC converter and a DC / AC converter, the battery is connected to the bidirectional DC / DC converter and the DC / AC converter respectively, the bidirectional DC / DC converter is connected to the DC bus of the drilling platform, the discharge circuit of the DC / AC converter is connected to the AC bus of the drilling platform, and the charging circuit of the DC / AC converter is connected to the mains power grid through an STS switch.
2. A grid-electric drilling energy storage system according to claim 1, characterized in that: A switch I is provided on the connection line between the bidirectional DC / DC converter and the DC bus of the drilling platform, a switch II is provided on the connection line between the DC / AC converter and the AC bus of the drilling platform, and a switch III is provided on the connection line between the STS switch and the mains power grid.
3. A grid-electric drilling energy storage system according to any one of claims 1-2, characterized in that: A transformer is provided at the AC end of the DC / AC converter.
4. A grid-electric drilling energy storage system according to any one of claims 1-2, characterized in that: A main power storage switch is provided at the rear end of the battery.
5. The grid-electric drilling energy storage system according to claim 1, characterized in that: The drilling power supply platform includes a diesel generator set, a DC bus, an AC-DC converter, an AC bus, a load power supply converter and a load. The diesel generator set generates electricity and outputs it to the DC bus. The DC bus is connected to the AC bus through the AC-DC converter, and the AC bus is connected to the load through the load power supply converter.