Network construction type hybrid energy storage regulation and control method and device for offshore oil and gas field power grid frequency support and wind power absorption

Abstract

The invention relates to the field of offshore oil and gas platform energy storage regulation and control, and discloses a network construction type hybrid energy storage regulation and control method and device oriented to offshore oil and gas field power grid frequency support and wind power absorption, and a conveying chain type gravity energy storage device based on an offshore oil and gas platform. The invention discloses a network construction type hybrid energy storage regulation and control method for achieving offshore oil and gas field power grid frequency support and wind power absorption. A weight upper bin, a weight lower bin and a conveying chain system are included. The upper weight bin is built between an offshore oil and gas platform deck and the sea level, and the two ends of the upper weight bin are supported by means of the left platform jacket and the right platform jacket. The weight lower bin is built in a seabed space under the offshore oil and gas platform; the conveying chain system is installed in the built stroke channel and supported by means of the platform left guide pipe frame. And a battery energy storage device is also built on the offshore oil and gas platform deck. According to the method, dynamic stabilization and absorption of new energy fluctuation such as offshore wind power can be realized, and the utilization rate of ocean energy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage control for offshore oil and gas platforms, and in particular to a grid-connected hybrid energy storage control method and device for frequency support and wind power consumption of offshore oil and gas field power grids. Background Art

[0002] As the core hub for marine resource development, offshore oil and gas platforms have long relied on traditional fossil fuels (such as diesel generators) for their energy supply systems, facing prominent challenges such as high carbon emissions, high operation and maintenance costs, and insufficient energy self-sufficiency. As the global energy transition accelerates, the development and utilization of offshore wind power and ocean energy (such as wave energy and tidal energy) have become key pathways to addressing these challenges. However, due to the intermittent and volatile nature of renewable energy sources such as offshore wind power, this can lead to frequency fluctuations in marine microgrids and unstable platform power supply. Therefore, the research and development of marine power storage technology has become a core direction for upgrading the energy systems of offshore oil and gas platforms.

[0003] Currently, marine power storage primarily relies on traditional energy storage technologies, such as electrochemical storage (e.g., batteries) and chemical storage (e.g., hydrogen / methane storage). However, these two methods are costly, and storage facilities are susceptible to the effects of the marine environment (e.g., high salt spray and severe corrosion). New gravity energy storage technology, by contrast, avoids these issues and offers advantages such as safety, stability, no degradation, and flexible control over charge and discharge times. However, its application in marine scenarios is still in the preliminary research stage. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide a grid-type hybrid energy storage control method and device for frequency support of offshore oil and gas field power grids and wind power absorption. It applies new gravity energy storage technology and uses the structure of the offshore oil and gas platform itself to build a transmission chain gravity energy storage device. Based on the energy storage grid VSG (virtual synchronous generator) control technology, it realizes the dynamic smoothing and absorption of fluctuations in new energy sources such as offshore wind power, so as to help offshore oil and gas platforms achieve low-carbon transformation of electricity and improve the utilization rate of marine energy.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a transmission chain type gravity energy storage device based on an offshore oil and gas platform, which is used to realize a grid-type hybrid energy storage control method for offshore oil and gas field power grid frequency support and wind power absorption, comprising: a heavy object upper warehouse, a heavy object lower warehouse and a transmission chain system; the heavy object upper warehouse is built between the deck of the offshore oil and gas platform and the sea level, and the two ends of the heavy object upper warehouse are supported by the platform left jacket and the platform right jacket; the heavy object lower warehouse is built in the seabed space directly below the offshore oil and gas platform; the transmission chain system is installed in the constructed travel channel and is supported by the platform left jacket; a battery energy storage device is also built on the deck of the offshore oil and gas platform.

[0006] Furthermore, the heavy object upper warehouse is surrounded by an upper warehouse bottom plate, an upper warehouse top plate, a platform left jacket frame and a platform right jacket frame; the upper warehouse top plate is arranged between the platform left jacket frame and the platform right jacket frame, and one end of the upper warehouse bottom plate is arranged on the inner side wall of the platform right jacket frame; Located in the upper warehouse for heavy objects, an upper warehouse AGV vehicle is configured on the upper warehouse floor.

[0007] Furthermore, the heavy object lower warehouse is surrounded by the lower warehouse bottom plate, the lower warehouse top plate, the platform left jacket and the platform right jacket; the bottoms of the platform left jacket and the platform right jacket are both set on the seabed, and one end of the lower warehouse top plate is set on the inner wall of the platform right jacket; the lower warehouse AGV vehicle is located in the heavy object lower warehouse and is configured on the seabed.

[0008] Furthermore, a gravity energy storage space is surrounded by the upper warehouse bottom plate, the upper warehouse top plate, the lower warehouse top plate, the seabed and the channel wall. The top of the channel wall is fixedly connected to the other end of the upper warehouse bottom plate, and the bottom of the channel wall is fixedly connected to the other end of the lower warehouse top plate; a number of heavy object modules are placed on the upper warehouse bottom plate and the seabed of the gravity energy storage space.

[0009] Furthermore, the conveyor chain system is supported by the platform's left jacket and installed in the travel channel; the travel channel is sealed and surrounded by the platform's left jacket and the channel wall.

[0010] Furthermore, the conveyor chain system includes a generator-motor integrated machine, a roller at the lower end of the conveyor chain, a support plate and a conveyor chain; The generator-motor integrated machine and the lower roller of the conveyor chain are both set on the inner wall of the left jacket of the platform. The generator-motor integrated machine is close to and higher than the upper warehouse bottom plate. The lower roller of the conveyor chain is installed on the seabed pile foundation of the jacket. The generator-motor integrated machine and the lower roller of the conveyor chain are connected through the conveyor chain transmission. Support plates are embedded at intervals on the conveyor chain to transmit heavy object modules.

[0011] Furthermore, the generator-motor integrated machine is equipped with a brake speed control device and a communication control system, which adjusts the energy storage and / or release power by controlling the speed of the conveyor chain and sending heavy object dispatch instructions to the AGV vehicle, and monitors the operation of the gravity energy storage device; the generator-motor integrated machine is connected to the marine AC microgrid.

[0012] Furthermore, heavy object module detection devices are installed on the surface of the lower warehouse AGV vehicle and the upper warehouse AGV vehicle. When the upper and lower warehouse AGV vehicles to be moved detect that the heavy object module has reached the upper and lower end positions of the conveyor chain, the corresponding heavy object module and support plate are removed, or the support plate and heavy object module are installed on the conveyor chain.

[0013] In a second aspect, the present invention adopts a technical solution: a grid-type hybrid energy storage control method for frequency support and wind power consumption in offshore oil and gas fields, comprising: a hybrid energy storage system composed of the above-mentioned transmission chain gravity energy storage device based on offshore oil and gas platforms and battery energy storage, and a control method using energy storage grid VSG technology; wherein, the hybrid energy storage control method includes: When renewable energy sources such as offshore wind power are generating sufficient electricity, a hybrid energy storage system is used to store electricity, and the system inertia of the microgrid is dynamically adjusted through transmission chain gravity energy storage; When renewable energy sources such as offshore wind power are insufficient, a hybrid energy storage system is used to release power, and a grid-connected solution based on VSG control is adopted; When the ocean area power grid needs to exchange power with the external power grid through the ocean transmission system, a hybrid energy storage system is used to store / release power, and a network construction solution based on VSG control is adopted when releasing power.

[0014] Furthermore, when the external power grid transmits electricity to the ocean regional power grid through the ocean transmission system, the operation of the hybrid energy storage system is arranged according to the real-time power balancing requirements of the ocean regional power grid.

[0015] The present invention has the following advantages due to the adoption of the above technical solution: 1. The present invention makes full use of marine resources and existing conditions, builds a gravity energy storage device based on the structure of the offshore oil and gas platform itself, and uses seawater as the gravity energy storage medium. This can effectively reduce the construction cost of the marine energy storage device and has the characteristics of safety, stability and no degradation.

[0016] 2. The present invention adopts a transmission chain gravity energy storage device, which can weaken the power intermittent problem of non-transmission chain gravity energy storage during the energy storage / release process to a certain extent. Its power size and charging and discharging time control are more flexible, and it is more adaptable to new energy sources such as offshore wind power.

[0017] 3. The mechanical movement of gravity energy storage in the present invention has a natural "inertial characteristic", and its kinetic energy change can directly participate in the system inertia support. By realizing the synergy of "physical energy storage + VSG control", it can make up for the limitation of traditional VSG control that only simulates inertia through algorithms, and improve the system's actual inertia support capacity and energy buffering capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of a transmission chain type gravity energy storage device based on an offshore oil and gas platform in an embodiment of the present invention; Figure 2 This is a simplified schematic diagram of a marine AC microgrid according to an embodiment of the present invention; Reference numerals: 1 is the sea level; 2 is the seabed (or platform pile foundation); 3 is the deck of the offshore oil and gas platform; 4 is the left jacket of the platform; 5 is the left jacket of the platform; 6 is the upper warehouse for heavy objects; 7 is the lower warehouse for heavy objects; 8 is the travel channel; 9 is the channel wall; 10 is the upper warehouse top plate; 11 is the upper warehouse bottom plate; 12 is the lower warehouse top plate; 13 is the conveyor chain system; 14 is the generator-motor integrated machine; 15 is the lower end roller of the conveyor chain; 16 is the support plate; 17 is the heavy object module (filled with seawater medium); 18 is the lower warehouse AGV vehicle; 19 is the upper warehouse AGV vehicle; 20 is the conveyor chain. DETAILED DESCRIPTION

[0019] In order to promote the stable supply, redundant consumption and low-carbon transformation of offshore oil and gas platforms, and improve the utilization rate of marine energy such as offshore wind power, the present invention combines the new transmission chain gravity energy storage and traditional battery energy storage technology to propose a grid-type hybrid energy storage control method and device for offshore oil and gas field power grid frequency support and wind power consumption, including a hybrid energy storage system based on a transmission chain gravity energy storage device and battery energy storage on offshore oil and gas platforms, and a control method using energy storage grid VSG (virtual synchronous generator) control technology. Among them, the traditional battery energy storage device is built using the remaining / available space on the deck of the offshore oil and gas platform. At the structural level of the hybrid energy storage system, the present invention focuses on the construction of the transmission chain gravity energy storage device.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] In one embodiment of the present invention, a transmission chain type gravity energy storage device based on an offshore oil and gas platform is provided to realize a grid-type hybrid energy storage control method for offshore oil and gas field power grid frequency support and wind power consumption. In this embodiment, the device is a hybrid energy storage system based on transmission chain type gravity energy storage and battery energy storage. The entire device is attached to a fixed offshore oil and gas platform and is built in the space surrounded by the platform deck, various jackets and the seabed. Figure 1As shown, the transmission chain type gravity energy storage device is built on a fixed offshore oil and gas platform, and includes: an upper heavy object warehouse 6, a lower heavy object warehouse 7 and a transmission chain system 13.

[0023] The heavy object upper warehouse 6 is built between the offshore oil and gas platform deck 3 and the sea level 1, and the two ends of the heavy object upper warehouse 6 are supported by the platform left jacket 4 and the platform right jacket 5; The heavy object lower warehouse 7 is built in the seabed 2 space directly below the offshore oil and gas platform; The conveyor chain system 13 is installed in the constructed travel channel 8 and is supported by the platform's left jacket 4; a battery energy storage device is also built on the offshore oil and gas platform deck 3. In this embodiment, the battery energy storage device adopts a traditional battery energy storage device in the prior art.

[0024] In the above embodiment, the heavy-load upper warehouse 6 is formed by an upper warehouse floor 11, an upper warehouse roof 10, and the left and right platform jackets 4 and 5. The upper warehouse roof 10 is positioned between the left and right platform jackets 4 and 5, and one end of the upper warehouse floor 11 is positioned on the inner wall of the right platform jacket 5. An upper warehouse AGV 19 is positioned within the heavy-load upper warehouse 6 and on the upper warehouse floor 11 to transport heavy-load modules 17.

[0025] In the above embodiment, the heavy-load lower warehouse 7 is formed by the lower warehouse floor, which serves as the seabed 2, the lower warehouse roof 12, and the left and right platform jackets 4 and 5. The bottoms of the left and right platform jackets 4 and 5 are both located on the seabed 2, and one end of the lower warehouse roof 12 is mounted on the inner wall of the right platform jacket 5. Located within the heavy-load lower warehouse 7, a lower warehouse AGV 18 is deployed on the seabed 2 to transport heavy-load modules 17.

[0026] In the above embodiment, the gravity energy storage space is surrounded by the upper warehouse floor 11, the upper warehouse roof 10, the lower warehouse roof 12, the seabed 2, and the channel wall 9. The top of the channel wall 9 is fixedly connected to the other end of the upper warehouse floor 11, and the bottom of the channel wall 9 is fixedly connected to the other end of the lower warehouse roof 12. Several weight modules 17 are placed on the upper warehouse floor 11 and the seabed 2 of the gravity energy storage space.

[0027] In the above embodiment, the conveyor chain system 13 is supported by the platform's left jacket 4 and installed in the travel channel 8; the travel channel 8 is sealed and enclosed by the platform's left jacket 4 and the channel wall 9. The conveyor chain system 13 includes a generator-motor integrated unit 14, a conveyor chain lower end roller 15, a support plate 16, and a conveyor chain 20. The generator-motor integrated unit 14 and the conveyor chain lower end roller 15 are both arranged on the inner wall of the platform's left jacket 4. The generator-motor integrated unit 14 is close to and higher than the upper warehouse bottom plate 11. The conveyor chain lower end roller 15 is installed at the jacket's seabed pile foundation. The generator-motor integrated unit 14 and the conveyor chain lower end roller 15 are connected by a transmission chain 20. Support plates 16 are embedded in the conveyor chain 20 at intervals to transmit heavy object modules 17.

[0028] In this embodiment, a plurality of embedding points for the support plates 16 are installed on the surface of the conveyor chain 20 , and the number of the embedding points can be designed with equal spacing according to the actual requirements of the system.

[0029] In this embodiment, the generator-motor integrated machine 14 is equipped with a braking speed control device and a communication control system, which adjusts the energy storage and / or release power by controlling the speed of the conveyor chain 20 and sending heavy object dispatch instructions to the AGV vehicle, and monitors the operation of the gravity energy storage device; the generator-motor integrated machine 14 is connected to the marine AC microgrid.

[0030] During operation, the heavy load module 17, using seawater as a gravity energy storage medium, is placed on a support plate 16 for transmission. The support plate 16 is embedded in a conveyor chain 20, which is driven by the generator-motor integrated unit 14. The heavy load module 17 is transmitted upward and downward in the travel channel 8 via the conveyor chain system 13 to store and release electricity. The upper heavy load warehouse 6 and the lower heavy load warehouse 7 are equipped with an upper warehouse AGV vehicle 19 and a lower warehouse AGV vehicle 18, respectively, to realize the storage and dispatch of the heavy load module 17.

[0031] In the above embodiment, the power intermittent problem generated when the conveyor chain type gravity energy storage device is unloading heavy objects can be improved by designing the volume of a single heavy object module 17 and the total number of heavy object modules 17 .

[0032] In this embodiment, the single unit volume and total number of the weight modules 17 can be designed according to the actual needs of the system, and are filled with seawater as a gravity energy storage medium, using local materials.

[0033] In each of the above embodiments, the lower warehouse AGV vehicle 18 and the upper warehouse AGV vehicle 19 are both equipped with a heavy object module detection device on their surfaces. When the upper and lower warehouse AGV vehicles to be operated detect that the heavy object module 17 has reached the upper and lower end positions of the conveyor chain 20, they remove the corresponding heavy object module 17 and support plate 16, or install the heavy object module 17 and support plate 16 onto the conveyor chain 20. The AGV vehicle is also equipped with a communication device for calculating and recording the real-time number of heavy object modules 17 stored in the heavy object upper warehouse 6 and the heavy object lower warehouse 7, as well as the number of heavy object modules 17 being transmitted by the conveyor chain 20; at the same time, it receives and executes the heavy object scheduling instructions sent by the communication control system of the generator-motor integrated machine 14.

[0034] The basic working principle of the transmission chain gravity energy storage device of the present invention is: when storing energy, the generator-motor integrated machine 14 works in the motor mode, and the heavy object module 17 in the heavy object lower warehouse 7 is lifted and transmitted to the heavy object upper warehouse 6 through the transmission chain system 13, thereby converting electrical energy into the gravitational potential energy of the heavy object module 17 for storage; when releasing energy, the generator-motor integrated machine 14 works in the generator mode, and the gravitational potential energy of the heavy object module 17 in the heavy object upper warehouse 6 is converted into mechanical energy, driving the generator-motor integrated machine to generate electricity, thereby converting the gravitational potential energy into electrical energy for output supply.

[0035] The traditional battery energy storage device in this embodiment is built based on the remaining / available space on the deck 3 of the offshore oil and gas platform, and cooperates with the transmission chain gravity energy storage device during operation to achieve accurate and rapid smoothing of new energy power fluctuations.

[0036] In the above embodiment, Figure 2 As shown, the microgrid in this embodiment can be equivalent to four parts: offshore wind power and other new energy sources, other marine power loads, marine power transmission system and offshore oil and gas platform electrical system (including offshore oil and gas platform loads and platform hybrid energy storage system, in which the transmission chain gravity energy storage and traditional battery energy storage are each equipped with an energy storage converter), all of which are connected in parallel to the marine AC microgrid. P 1 is the input power of new energy such as offshore wind power, P 2 is the power consumption of other marine power loads, P 3 is the exchange power between the marine AC microgrid and the external power grid, P L Power consumption for offshore oil and gas platforms, P Storage It is the gravity energy storage / release power of offshore oil and gas platforms.

[0037] In one embodiment of the present invention, a hybrid energy storage control method for offshore oil and gas field grid frequency support and wind power consumption is provided. The method includes a hybrid energy storage system composed of a transmission chain gravity energy storage device and battery energy storage based on an offshore oil and gas platform, and a control method using energy storage grid VSG (virtual synchronous generator control) technology. In this embodiment, the hybrid energy storage control method has the following working modes: Figure 2 Taking this as an example, the method includes: 1) Energy storage mode: When renewable energy sources such as offshore wind power are generating sufficient power (i.e., the power generation of the marine regional power grid exceeds the power demand of the marine load), a hybrid energy storage system is used to store power, and the system inertia of the microgrid is dynamically adjusted through transmission chain gravity energy storage; Specifically, when renewable energy sources such as offshore wind power are sufficient and in an island microgrid operating state, the following conditions are met: The chain-type gravity energy storage device continuously transfers several weight modules 17 from the lower weight storage bin 7 to the upper weight storage bin 6. By controlling the speed of the conveyor chain 20 and the number of weight modules 17 carried, the power storage capacity can be flexibly adjusted.

[0038] Assuming that the real-time capacity of the transmission chain gravity energy storage device is sufficient, the energy storage power can theoretically be adjusted to meet , to fully absorb the excess power of offshore wind power; when the gravity energy storage capacity or regulation accuracy is insufficient, traditional battery energy storage will be used in conjunction with energy storage.

[0039] 2) Energy Release Mode 1: When renewable energy sources such as offshore wind power are insufficient (i.e., the power generation of the offshore regional grid is less than the power demand of the marine load), a hybrid energy storage system is used to release power, and a VSG-based control-based grid configuration solution is adopted; Specifically, when offshore wind power and other renewable energy sources are insufficient and operating in an isolated microgrid, the following conditions are met: . Electric energy storage is carried out through a hybrid energy storage system, and a network construction scheme based on VSG control is adopted. The transmission chain gravity energy storage device continuously transmits several heavy object modules 17 from the heavy object upper warehouse 6 to the heavy object lower warehouse 7. By controlling the speed of the transmission chain 20 and the number of heavy object modules 17 carried, the power of electric energy release can be flexibly adjusted. Assuming that the real-time capacity of the transmission chain gravity energy storage device is sufficient, the power release power can be adjusted to meet the requirements in theory. , to achieve continuous power supply to offshore oil and gas platform loads; when the gravity energy storage capacity or adjustment accuracy is insufficient, traditional battery energy storage is used in conjunction with energy storage.

[0040] 3) Energy Release Mode 2: When the ocean power grid needs to exchange power with an external grid via the ocean transmission system, a hybrid energy storage system is used for power storage / release. A VSG-based control-based network configuration scheme is used for power release. Specifically, when the ocean area power grid needs to transmit electricity to the outside through the ocean transmission system, it is in the non-island operation state of the microgrid: , when the following equation is satisfied: , through the hybrid energy storage system to release electricity, the actual P The command value of 3 P 3_Target To adjust the energy release power of the hybrid energy storage system P Storage , when the adjustable capacity of the hybrid energy storage system is sufficient, the energy release power can theoretically be adjusted to meet: .

[0041] This embodiment also includes other modes: when the external power grid transmits electricity to the ocean area power grid through the ocean power transmission system, the operation of the hybrid energy storage system can be reasonably arranged according to the real-time power balance requirements of the ocean area power grid.

[0042] In this embodiment, a storage converter is configured for each of the chain-type gravity energy storage and the traditional battery energy storage in the hybrid energy storage system. When storing / releasing power, the storage converter acts as an interface for a "virtual synchronous machine" to exchange power with the marine microgrid. It also simulates inertia, damping, and droop characteristics through algorithms to respond to grid frequency / voltage fluctuations in real time.

[0043] In this embodiment, a grid-connected hybrid energy storage control method for offshore oil and gas field grid frequency support and wind power consumption is analyzed using transmission chain gravity energy storage as the object, wherein the VSG grid control method is specifically as follows: The control equations for active power-frequency and reactive power-voltage in a typical VSG control scheme are shown in Equation (1). For reactive power-voltage regulation, the traditional droop control method is still used: (1) in, Virtual inertia for VSG control compensation, They are VSG control output frequency and its set value, are the converter output active power and its set value, is the damping coefficient, They are VSG control output voltage and its set value, are the converter output reactive power and its set value, is the reactive-voltage droop coefficient.

[0044] For the transmission chain gravity energy storage, the actual kinetic energy of the transmitted weight can be included in the total virtual inertia (which can be considered as the total inertia required). Assume that the transmission speed of the conveyor chain is v, the angular velocity of the generator-motor integrated machine is , the number of heavy object modules 17 transmitted by the conveyor chain is n , the mass of a single weight module 17 is m , then the real-time kinetic energy of the total weight is: (2) Based on this, the mechanical inertia provided by the weight can be obtained J m and total virtual inertia for: (3) According to the above formula, when storing / releasing electric energy, the gravity energy storage is adjusted. n and v The parameters can adjust the system inertia and dynamically respond to the frequency fluctuation of the system. According to formula (3), the virtual inertia actually required in the VSG control strategy can be obtained as: (4) Combining equations (1) and (4), the VSG network control equation of the converter of the transmission chain gravity energy storage device can be obtained as follows: (5) The power setting reference value in the above VSG control equation (5) is calculated by the power outer loop. Taking the active outer loop as an example, assuming that the system works in energy release mode 2, at this time, the gravity energy storage adopts the VSG network construction method. According to the above content, the total output power that the hybrid energy storage system needs to provide is: (6) P Storage It should be undertaken jointly by transmission chain gravity energy storage and traditional battery energy storage. P Z 、 P D The active power required by the transmission chain gravity energy storage device and the traditional battery energy storage device is respectively to meet the following requirements: (7) in, k It is the real-time distribution coefficient of active power released by the hybrid energy storage system.

[0045] Combining the above equations (5), (6) and (7), we can obtain the equivalent formula for the outer loop of the gravity energy storage VSG active power reference value generation: (8) By combining equations (5) and (8), we can finally obtain the power and network outer loop control equations of the converter of the transmission chain gravity energy storage device: (9) The method provided in this embodiment is implemented based on the above-mentioned device embodiments. Please refer to the above-mentioned embodiments for the specific process and detailed content, which will not be repeated here.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A transmission chain gravity energy storage device based on an offshore oil and gas platform, used to implement a grid-connected hybrid energy storage control method for frequency support of offshore oil and gas field power grids and wind power consumption, characterized in that: include: Heavy object upper warehouse (6), heavy object lower warehouse (7) and conveyor chain system (13); The heavy object upper warehouse (6) is built between the deck (3) of the offshore oil and gas platform and the sea level (1), and both ends of the heavy object upper warehouse (6) are supported by the platform left jacket (4) and the platform right jacket (5); The heavy object lower warehouse (7) is built on the seabed (2) space directly below the offshore oil and gas platform; The conveyor chain system (13) is installed in the constructed travel channel (8) and is supported by the platform left jacket (4); a battery energy storage device is also built on the offshore oil and gas platform deck (3).

2. The transmission chain type gravity energy storage device based on an offshore oil and gas platform as claimed in claim 1, characterized in that: The heavy object upper warehouse (6) is surrounded by an upper warehouse bottom plate (11), an upper warehouse top plate (10), a platform left jacket (4) and a platform right jacket (5); the upper warehouse top plate (10) is arranged between the platform left jacket (4) and the platform right jacket (5), and one end of the upper warehouse bottom plate (11) is arranged on the inner side wall of the platform right jacket (5); Located in the heavy object upper warehouse (6), an upper warehouse AGV vehicle (19) is configured on the upper warehouse bottom plate (11).

3. The transmission chain type gravity energy storage device based on an offshore oil and gas platform as claimed in claim 1, characterized in that: The heavy object lower warehouse (7) is surrounded by a lower warehouse bottom plate, a lower warehouse top plate (12), a platform left jacket (4), and a platform right jacket (5); the bottoms of the platform left jacket (4) and the platform right jacket (5) are both arranged on the seabed (2), and one end of the lower warehouse top plate (12) is arranged on the inner side wall of the platform right jacket (5); Located in the heavy object lower warehouse (7), a lower warehouse AGV vehicle (18) is configured on the seabed (2).

4. The transmission chain type gravity energy storage device based on an offshore oil and gas platform as claimed in claim 1, characterized in that: A gravity energy storage space is formed by an upper warehouse bottom plate (11), an upper warehouse top plate (10), a lower warehouse top plate (12), a seabed (2) and a channel wall (9); the top of the channel wall (9) is fixedly connected to the other end of the upper warehouse bottom plate (11), and the bottom of the channel wall (9) is fixedly connected to the other end of the lower warehouse top plate (12); and a plurality of weight modules (17) are placed on the upper warehouse bottom plate (11) and the seabed (2) of the gravity energy storage space.

5. The transmission chain type gravity energy storage device based on an offshore oil and gas platform as claimed in claim 4, characterized in that: The conveyor chain system (13) is supported by the platform left conductor frame (4) and installed in the travel channel (8); the travel channel (8) is sealed and surrounded by the platform left conductor frame (4) and the channel wall (9).

6. The transmission chain type gravity energy storage device based on an offshore oil and gas platform as claimed in claim 5, characterized in that: The conveyor chain system (13) includes a generator-motor integrated machine (14), a conveyor chain lower end roller (15), a support plate (16) and a conveyor chain (20); The generator-motor integrated machine (14) and the lower end roller (15) of the conveyor chain are both arranged on the inner side wall of the left jacket (4) of the platform. The generator-motor integrated machine (14) is close to and higher than the upper warehouse bottom plate (11). The lower end roller (15) of the conveyor chain is installed on the seabed pile foundation of the jacket. The generator-motor integrated machine (14) and the lower end roller (15) of the conveyor chain are connected by a conveyor chain (20). A support plate (16) is embedded at intervals on the conveyor chain (20) to transmit a heavy object module (17).

7. The transmission chain type gravity energy storage device based on an offshore oil and gas platform as claimed in claim 6, characterized in that: The generator-motor integrated machine (14) is equipped with a brake speed regulating device and a communication control system, which adjusts the energy storage and / or release power by controlling the speed of the conveyor chain (20) and sending a heavy object dispatching instruction to the AGV vehicle, and monitors the operation of the gravity energy storage device; the generator-motor integrated machine (14) is connected to the marine AC microgrid.

8. The transmission chain type gravity energy storage device based on an offshore oil and gas platform as claimed in claim 6, characterized in that: A weight module detection device is installed on the surface of the lower warehouse AGV vehicle (18) and the upper warehouse AGV vehicle (19). When the upper and lower warehouse AGV vehicles to be moved detect that the weight module (17) reaches the upper and lower end positions of the conveyor chain (20), the corresponding weight module (17) and the support plate (16) are removed, or the support plate (16) and the weight module (17) are installed on the conveyor chain (20).

9. A grid-connected hybrid energy storage control method for frequency support of offshore oil and gas field power grids and wind power consumption, characterized in that: include: A hybrid energy storage system consisting of a transmission chain gravity energy storage device based on an offshore oil and gas platform as described in any one of claims 1 to 8 and battery energy storage, and a control method using energy storage network VSG technology; wherein the hybrid energy storage control method includes: When renewable energy sources such as offshore wind power are generating sufficient electricity, a hybrid energy storage system is used to store electricity, and the system inertia of the microgrid is dynamically adjusted through transmission chain gravity energy storage; When renewable energy sources such as offshore wind power are insufficient, a hybrid energy storage system is used to release power, and a grid-connected solution based on VSG control is adopted; When the ocean area power grid needs to exchange power with the external power grid through the ocean transmission system, a hybrid energy storage system is used to store / release power, and a network construction solution based on VSG control is adopted when releasing power.

10. The grid-connected hybrid energy storage control method for frequency support of offshore oil and gas field power grids and wind power consumption according to claim 9, characterized in that: When the external power grid transmits electricity to the ocean regional power grid through the ocean transmission system, the operation of the hybrid energy storage system is arranged according to the real-time power balance requirements of the ocean regional power grid.

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