Offshore floating barge type photovoltaic energy storage power station

Abstract

The utility model provides an offshore floating barge type photovoltaic energy storage power station. A barge is composed of a photovoltaic system arranged on a two-layer deck, an energy storage system and a wireless charging and discharging system arranged on a first-layer deck, and a control protection and energy management system arranged on a bottom-layer cabin. The photovoltaic system can generate power to charge the energy storage system when the barge sails on the sea and is berthed in the daytime; the energy storage system can run to a land power grid with sufficient electric quantity to absorb electric energy to charge an energy storage container, and can also run to power-lacking power grids such as islands or offshore working platforms to discharge electric energy to supply power to the power grids; and the control protection and energy management system is used for control of system switches of the whole station, relay protection and energy flow direction control. According to the utility model, the construction cost of the submarine cable can be reduced, the technical limitation range of the laying length of the alternating-current submarine cable is broken through, the power supply of a deep and far sea working platform is guaranteed, and the working range of an offshore working platform is expanded.

Description

Technical Field

[0001] The utility model belongs to the technical field of new forms of energy generation, electric energy storage and electric energy transmission at sea, and specifically relates to a mobile photovoltaic energy storage power station on a barge at sea, which integrates a photovoltaic power generation system, an energy storage system and a wireless charging and discharging system on the barge to realize the generation, storage and transmission of electric energy at sea. Background Art

[0002] With the global energy transformation and the pursuit of renewable energy, the combination of solar power generation technology and energy storage technology has received widespread attention and application. Especially in places with special geographical locations, such as islands or offshore platforms, the way of transmitting and supplying electricity by land power grids is not only difficult to achieve, but also extremely costly. In order to solve the power supply problem in these places, it is necessary to find a solution that can be flexibly moved and has a certain power storage capacity.

[0003] At present, due to the high cost of submarine cable construction, many islands cannot obtain sufficient electricity, especially those islands far from the shore, which do not even have electricity. Their electricity needs can only be met by diesel generators and electricity obtained from expensive diesel. This greatly restricts the development of island society, military, and economy. On the other hand, offshore work platforms are restricted by the transmission distance of AC submarine cables and the reactive power limit, and can only transmit AC power within 80 kilometers along the coastline. The cost of power transmission using flexible DC technology is even higher. Utility Model Content

[0004] In view of the problems existing in the background technology, the utility model adopts a mobile photovoltaic energy storage power station on the sea barge, fully utilizes and transforms the space of the barge, and combines the arrangement of photovoltaic, energy storage and wireless charging and discharging equipment on the barge. It flexibly, efficiently and reliably realizes the complete process of offshore power generation, charging, long-distance transmission and discharge of electric energy. It realizes a new technical solution for long-distance transmission of electricity at sea, and solves the technical bottleneck of electricity consumption in deep-sea offshore work platforms and remote islands.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A mobile offshore barge photovoltaic energy storage power station includes an energy storage power station system arranged on the first deck of the barge and a ship-based wireless charging and discharging system: the energy storage power station system is composed of an electrochemical energy storage container and a DC / DC rectifier. The system can store the electric energy generated by the photovoltaic power station system, or after being fully charged from the land power grid by the ship-based wireless charging and discharging system, it can be transported to the offshore power load network with power shortage to supply power.

[0007] The photovoltaic power station system is arranged on the second deck of the barge: the offshore special anti-corrosion photovoltaic panels supported by flat single-axis brackets are installed on the second deck. The system can absorb solar energy and convert it into electrical energy to charge the energy storage power station system.

[0008] It includes the equipment arranged in the cabin at the bottom of the barge to monitor and control the real-time operating status of the photovoltaic power station and the energy storage power station, and to protect and cut off the faulty circuits during operation; and to control the operation of various switches and the direction of electric energy flow in the entire station, relay protection panels and energy management systems.

[0009] It includes a ship-based wireless charging and discharging system and a shore-based wireless charging and discharging system: the two systems need to be used in pairs, so that the system current can flow forward or reverse, and the power grid can charge the energy storage power station system or the energy storage power station system can discharge the power grid; wireless charging from the strong land power grid and wireless discharging to the power-deficient offshore power grid can be realized.

[0010] The ship-based wireless charging and discharging system and the shore-based wireless charging and discharging system are used in pairs. The principle of electromagnetic transformation is adopted. The high-frequency AC and DC converter is controlled by the ship-based switch. The ship-based wireless charging and discharging system converts DC into high-frequency AC, thereby generating a changing magnetic field. This magnetic field is received and converted into high-frequency AC by the shore-based wireless charging and discharging system, and rectified into DC. Then, the DC is converted into industrial frequency AC through the industrial frequency AC and DC converter, thereby realizing the wireless transmission of power from the energy storage power station system to the power grid. Conversely, electric energy can also be charged from the power grid to the energy storage power station system. Finally, the offshore mobile barge photovoltaic energy storage power station is realized after rapid charging from the onshore power grid, and then goes to the island or offshore platform with power shortage to supply power to the power load network.

[0011] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

[0012] As a preferred technical solution of the utility model: a towing hook, a towing cable and an anchor chain are arranged on the first deck of the barge, and the barge can be pulled forward or thrusted by a tugboat or a pusher boat, can move on the sea, and can also be moored at the port by the anchor chain.

[0013] As a preferred technical solution of the utility model: the barge can be composed of a barge fleet consisting of tugboats or pushboats, so as to increase the amount of electric energy that can be transmitted by a single photovoltaic energy storage power station, transport the electric energy to offshore work platforms and islands by sailing on the sea, and carry out power supply operations to power grids with power shortages after mooring with anchor chains.

[0014] As a preferred technical solution of the utility model: the photovoltaic power station system on the second deck is composed of a special marine anti-corrosion photovoltaic panel and a flat single-axis bracket. The flat single-axis bracket can adjust the horizontal angle of the photovoltaic panel to maximize the vertical angle between the photovoltaic panel and the sun, thereby increasing the horizontal radiation and photovoltaic power generation.

[0015] The special offshore anti-corrosion photovoltaic panels are connected to each other through DC cables and aggregated to the photovoltaic side of the DC / DC rectifier on the first deck. Through the dynamic voltage regulation function of the DC / DC rectifier, the DC voltage output by the photovoltaic power station system is matched with the DC voltage on the outlet side of the electrochemical energy storage container, so that the photovoltaic power station system absorbs the electricity generated by solar energy and can directly charge the electrochemical energy storage container through the voltage regulation of the DC / DC rectifier.

[0016] As a preferred technical solution of the utility model: the energy storage power station system arranged on the first deck of the barge and the photovoltaic power station system arranged on the second deck are electrically connected to form a DC-coupled photovoltaic storage power generation system.

[0017] The energy storage power station system is composed of an electrochemical energy storage container and a DC / DC rectifier;

[0018] The electrochemical energy storage container is connected to the energy storage side of the DC / DC rectifier via a DC cable.

[0019] As a preferred technical solution of the utility model: the DC / DC rectifier is electrically connected to the ship-based wireless charging and discharging system, and its dynamic voltage regulation function also has the function of matching the DC voltage obtained by electromagnetic conversion of the ship-based wireless charging and discharging system with the DC voltage on the outlet side of the electrochemical energy storage container, thereby making the ship-based wireless charging and discharging system electrically connected to the energy storage power station system and realizing charging and discharging.

[0020] As an optimal technical solution of the utility model: the ship-based wireless charging and discharging system is composed of a high-frequency AC and DC converter controlled by a ship-based switch, and is used in pair with a shore-based wireless charging and discharging system.

[0021] As an optimal technical solution of the utility model: the shore-based wireless charging and discharging system is composed of a switch-controlled industrial frequency AC and DC converter and a shore-based switch-controlled DC and high-frequency AC converter.

[0022] As a preferred technical solution of the utility model: the control, protection and operation and maintenance system is equipped with a photovoltaic energy storage power station control, relay protection panel cabinet and energy management system, which is used to control, monitor and maintain the entire station system to ensure the safe and stable operation of the system. The energy management system controls the charging or discharging flow direction of the ship-based wireless charging and discharging system and the shore-based wireless charging and discharging system, and coordinates the cooperation of various systems and switches to achieve the control of the charging and discharging state of electric energy under specific working conditions.

[0023] As a preferred technical solution of the utility model: the bottom cabin of the barge is arranged with an inspection and maintenance area for operation and maintenance personnel.

[0024] The utility model provides a photovoltaic energy storage power station on a floating barge at sea. The barge is composed of a photovoltaic system arranged on the second deck, an energy storage system and a wireless charging and discharging system arranged on the first deck, and a control protection and energy management system arranged in the bottom cabin. The photovoltaic system can generate electricity to charge the energy storage system when the barge is sailing on the sea and moored at the shore during the day. The energy storage system can travel to a land power grid with sufficient electricity to absorb electricity to charge the energy storage container, and can also travel to power grids with power shortages such as islands or offshore work platforms to release electricity to supply power to the power grid. The control protection and energy management system is used for the control of switches of the entire station system, relay protection and energy flow direction control.

[0025] The utility model provides a mobile offshore barge photovoltaic energy storage power station, which arranges solar power generation equipment and energy storage equipment on a mobile barge, becoming a promising solution that can make wireless power transmission between an island or offshore work platform and a land power grid possible. The utility model can reduce the construction cost of submarine cables, break through the technical limitations of the laying length of AC submarine cables, ensure the power supply of deep-sea work platforms, and expand the operating range of offshore work platforms. At the same time, through ship-based and shore-based wireless charging and discharging technology, the rapid and effective transmission of electric energy is ensured to meet the power needs of different offshore platforms or island load networks.

[0026] Compared with the prior art, it has the following beneficial effects:

[0027] The technology is highly flexible, overcoming the limitations of AC submarine cable transmission distance, overcoming the limitations of high cost of flexible DC deep-sea transmission, reducing the cost of offshore transmission of electric energy, absorbing and storing electric energy from the land power grid, and transporting it to any island and offshore work platform at sea. The transmission distance is long and the cost is excellent. The offshore mobile barge photovoltaic energy storage power station can be flexibly moved at sea, and is particularly suitable for establishing electrical connections between remote islands or deep-sea offshore work platforms and other power demand areas and strong land power grids, and completing power transmission. The offshore mobile barge photovoltaic energy storage power station can quickly charge from the land power grid through wireless charging and discharging system equipment, and quickly go to the deep-sea power demand area to carry out power supply operations. Furthermore, the amount of electricity transported to the power supply operation site in a single time can be increased by forming a barge fleet. Furthermore, the barge is equipped with a photovoltaic power generation system, which can use daytime solar power generation to charge the energy storage system on the barge during the barge's voyage at sea and during the charging and discharging period at shore, thereby increasing economic benefits and improving the operating efficiency of the overall long-distance power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a side structural schematic diagram of the offshore floating barge-type photovoltaic energy storage power station provided by the utility model;

[0029] Figure 2 This is a schematic diagram of the structure from the top of the second deck;

[0030] Figure 3 This is a schematic diagram of the structure from a bird's-eye view on the first deck;

[0031] Figure 4 This is a schematic diagram of the structure in the bottom cabin from a bird's-eye view;

[0032] Figure 5 Electrical schematics for ship-based and shore-based wireless charging and discharging;

[0033] The markings in the attached figure are: 1-offshore barge; 2-bottom cabin; 3-first deck; 4-second deck; 5-control, protection and operation and maintenance system; 6-energy storage power station system; 7-ship-based wireless charging and discharging system; 8-photovoltaic power station system; 9-shore-based wireless charging and discharging system; 10-power grid; 11-tow hook, tow cable and anchor chain; 12-flat single-axis bracket; 13-photovoltaic panel; 14-electrochemical energy storage container; 15-DC / DC rectifier; 16-DC cable; 17-control and relay protection panel cabinet of photovoltaic energy storage power station; 18-energy management system; 19-manned maintenance and operation and maintenance area; 20-ship-based switch controls high-frequency AC and DC converters; 21-switch controls industrial frequency AC and DC converters; 22-shore-based switch controls DC and high-frequency AC converters. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings, but is not intended to be a basis for limiting the present invention.

[0035] like Figure 1-5As shown, a mobile offshore barge photovoltaic energy storage power station, the offshore barge 1 is constructed with a bottom cabin 2, a first deck 3 and a second deck 4. The control, protection and operation and maintenance system 5 of the whole ship power station is arranged in the bottom cabin 2, including the control and relay protection cabinets 17 of the photovoltaic and energy storage power stations, the energy management system 18 and the maintenance and maintenance area 19 of the operation and maintenance personnel; the energy storage power station system 6 and the ship-based wireless charging and discharging system 7 are arranged on the first deck 3, the energy storage power station system 6 is composed of an electrochemical energy storage container 14 and a DC / DC rectifier 15, and the ship-based wireless charging and discharging system 7 is composed of a high-frequency AC and DC converter 20 controlled by a ship-based switch. At the same time, a towing hook, a towing cable and an anchor chain 11 are also arranged on the first deck 3 for the tugboat to provide traction to the barge; the photovoltaic power station system 8 is arranged on the second deck 4, which is composed of a special offshore anti-corrosion photovoltaic panel 13 and a flat single-axis bracket 12 for support. At the same time, the electrochemical energy storage container 14 , the DC / DC rectifier 15 , the offshore special anti-corrosion photovoltaic panel 13 and the switch-controlled high-frequency AC and DC converter 20 are all connected by a DC cable 16 .

[0036] like Figure 1-2 As shown, the special marine anti-corrosion photovoltaic panel 13 arranged on the second deck 4 is supported by a flat single-axis bracket 12. The flat single-axis bracket 12 can control and adjust the horizontal angle of the photovoltaic panel through its own driving motor. When the offshore movable barge photovoltaic energy storage power station is sailing at sea or moored at the shore, the horizontal angle of the photovoltaic panel can be adjusted to maximize the vertical angle between the photovoltaic panel and the sun's incidence, thereby increasing the horizontal radiation and photovoltaic power generation.

[0037] like Figure 1 and 3 As shown, the ship-based wireless charging and discharging system 7 is arranged on the ship extension side in the middle of the first deck 3, and the DC / DC rectifier 15 and the electrochemical energy storage container 14 are arranged in sequence from the middle of the deck to both sides. The spacing of the electrochemical energy storage containers 14 is reserved for fire safety distance, container door opening distance, and personnel maintenance and evacuation channel distance. The electrochemical energy storage container 14, the DC / DC rectifier 15 and the ship-based wireless charging and discharging system 7 are all connected by DC cables. After the voltage of the DC / DC rectifier 15, the electric energy stored in the electrochemical energy storage container 14 is connected and matched to the rated working voltage of the high-frequency AC and DC converter 20 of the ship-based wireless charging and discharging system 7 to achieve electrical connection. The towing hook, towing cable and anchor chain 11 are arranged on the front side of the ship to connect the tugboat, provide traction to the barge and fix the barge.

[0038] like Figure 1 and 4As shown, two rows of parallel-arranged cabinets are arranged in the bottom cabin 2, and the distance between the two rows of cabinets is reserved for fire safety, the distance between the cabinet doors, and the distance required for personnel maintenance and evacuation passages. Specifically, the configured cabinets are mainly control and relay protection cabinets 17 and energy management system 18 of the photovoltaic energy storage power station. The control and relay protection cabinets 17 are used to control, monitor and maintain all systems of the station to ensure the safe and stable operation of the station. The energy management system 18 controls the charging or discharging tidal current direction of the ship-based wireless charging and discharging system 7 and the shore-based wireless charging and discharging system 9, and coordinates the cooperation of various systems and switches to achieve control of the charging and discharging state of electrical energy under specific working conditions.

[0039] like Figure 5 As shown, the shore-based wireless charging and discharging system 9 is composed of a switch-controlled industrial frequency AC and DC converter 21 and a shore-based switch-controlled DC and high-frequency AC converter 22, which is arranged on the land shore to connect to the large onshore power grid system, or arranged on the shore of the island to connect to the island distribution network system, or arranged on the edge of the offshore work platform and connected to the distribution network system of the offshore work platform, so as to facilitate its spatial and physical docking with the ship-based wireless charging and discharging system 7.

[0040] After the offshore mobile barge photovoltaic energy storage power station docks, the plates of the ship-based wireless charging and discharging system 7 are aligned with the plates of the shore-based wireless charging and discharging system 9, and the energy storage power station system 6 is charged and operated through the control of the energy management system 18. The industrial frequency AC and DC converter 21 is controlled by the switch of the shore-based wireless charging and discharging system 9 from the land-based strong power grid 10, and the industrial frequency AC from the power generation end of the power grid 10 is converted into DC, and then the DC and high-frequency AC converter 22 is controlled by the shore-based switch to convert it into high-frequency AC, generating a changing strong magnetic field, and the electric energy is emitted by the plates through the strong magnetic field. The plates of the ship-based wireless charging and discharging system 7 and the high-frequency AC and DC converter 20 controlled by the ship-based switch receive the strong magnetic field and convert it back to high-frequency AC electric energy, and then the high-frequency AC is converted into DC and then connected to the DC / DC rectifier 15 for dynamic voltage adjustment to the rated working voltage range of the electrochemical energy storage container 14, so as to realize the charging of the electrochemical energy storage container 14.

[0041] When the electrochemical energy storage container 14 is fully charged, the tugboat can transport the offshore mobile barge photovoltaic energy storage power station to various islands or offshore work platforms by connecting the towing hook, towing cable and anchor chain 11 on the first deck 3 of the barge to start power supply operation. Specifically, the plates of the ship-based wireless charging and discharging system 7 are matched again with the plates of the shore-based wireless charging and discharging system 9 on the island or offshore work platform, and the energy storage power station system 6 is discharged and operated under the control of the energy management system 18. The electrochemical energy storage container 14 is connected to the DC / DC rectifier 15 through a DC cable 16, and the voltage is dynamically adjusted to the rated working voltage range of the ship-based wireless charging and discharging system 7. The high-frequency AC and DC converter 20 is controlled by the ship-based switch to convert DC power into high-frequency AC power, generating a changing strong magnetic field. The electric energy is emitted by the pole plate through the strong magnetic field, and the pole plate of the shore-based wireless charging and discharging system 9 and the shore-based switch control the DC and high-frequency AC converter 22 to receive the strong magnetic field and convert it back to DC power. The power frequency AC and DC converter 21 is then controlled by the switch to convert the DC power back to power frequency AC power, and finally connected to the power distribution system of the power grid 10 of the island and the offshore work platform to complete the power supply operation.

[0042] It is worth noting that the photovoltaic power station system 8 arranged on the second deck 4 can use daylight to charge the energy storage power station system 6 when the barge 1 is sailing at sea or docked at the port, thereby improving the charging efficiency of the power station energy storage system and the overall station operation efficiency, and saving the time for the mobile barge photovoltaic energy storage power station to charge from the shore-based wireless charging and discharging system 9.

[0043] The above embodiment is only a preferred technical solution of the present invention. Those skilled in the art should understand that the technical solutions or parameters in the embodiments can be modified or replaced without departing from the principle and essence of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. An offshore floating barge photovoltaic energy storage power station, characterized in that: The offshore floating barge-type photovoltaic energy storage power station comprises an offshore barge (1), wherein a control, protection and operation and maintenance system (5) is provided in the bottom cabin (2) of the offshore barge (1), an energy storage power station system (6) and a ship-based wireless charging and discharging system (7) are provided on the first deck (3) of the offshore barge (1), and a photovoltaic power station system (8) is provided on the second deck (4) of the offshore barge (1); The photovoltaic power station system (8) is used to charge the energy storage power station system (6); the energy storage power station system (6) and the photovoltaic power station system (8) are connected together to form a DC-coupled photovoltaic power generation system; The ship-based wireless charging and discharging system (7) is used in pair with the shore-based wireless charging and discharging system (9), and the power grid (10) charges the energy storage power station system (6) or the energy storage power station system (6) discharges the power grid (10); The four major systems, namely, the energy storage power station system (6), the ship-based wireless charging and discharging system (7), the photovoltaic power station system (8) and the shore-based wireless charging and discharging system (9), work together to realize charging of electric energy from a power grid with abundant electric energy (10), and discharging of electric energy to a power grid with insufficient electric energy (10) through the offshore movable barge photovoltaic energy storage station.

2. The offshore floating barge photovoltaic energy storage power station according to claim 1 is characterized in that: A towing hook, a towing cable and an anchor chain (11) are arranged on a first deck (3) of the offshore barge (1), so that a barge fleet consisting of tugboats or pushboats is formed to increase the amount of electricity carried by the photovoltaic energy storage power station, transport the electric energy to the offshore work platform and islands by sailing on the sea, and carry out power supply operations to the power grid (10) that lacks electricity after mooring with an anchor chain.

3. The offshore floating barge photovoltaic energy storage power station according to claim 1 is characterized in that: The photovoltaic power station system (8) is composed of a special offshore anti-corrosion photovoltaic panel (13) supported by a flat single-axis bracket (12), and is arranged on the second deck (4); the flat single-axis bracket (12) adjusts the horizontal angle of the anti-corrosion photovoltaic panel (13) according to the heading of the barge; The special anti-corrosion photovoltaic panels (13) for offshore use are interconnected via direct current cables (16) and are connected to the photovoltaic side of a DC / DC rectifier (15) on a deck (3). The direct current voltage output by the photovoltaic power station system (8) is matched with the direct current voltage on the outlet side of the electrochemical energy storage container (14) through the dynamic voltage regulation function of the DC / DC rectifier (15). The photovoltaic power station system (8) absorbs solar energy and generates electricity, which can be used to directly charge the electrochemical energy storage container (14) through the voltage regulation of the DC / DC rectifier (15).

4. The offshore floating barge photovoltaic energy storage power station according to claim 1 is characterized in that: The energy storage power station system (6) is composed of an electrochemical energy storage container (14) and a DC / DC rectifier (15); The electrochemical energy storage container (14) is connected to the energy storage side of the DC / DC rectifier (15) via a DC cable (16).

5. The offshore floating barge photovoltaic energy storage power station according to claim 1 is characterized in that: The control, protection and operation and maintenance system (5) is provided with a photovoltaic energy storage power station control, relay protection panel cabinet (17) and an energy management system (18).

6. The offshore floating barge photovoltaic energy storage power station according to claim 1, characterized in that: The ship-based wireless charging and discharging system (7) is composed of a high-frequency AC and DC converter (20) controlled by a ship-based switch, and is used in pair with a shore-based wireless charging and discharging system (9).

7. The offshore floating barge photovoltaic energy storage power station according to claim 1 or 6, characterized in that: The shore-based wireless charging and discharging system (9) is composed of a switch-controlled industrial frequency AC to DC converter (21) and a shore-based switch-controlled DC to high-frequency AC converter (22).

8. The offshore floating barge photovoltaic energy storage power station according to claim 1, characterized in that: The ship-based wireless charging and discharging system (7) and the shore-based wireless charging and discharging system (9) operate in a forward direction, with the power grid (10) charging the electrochemical energy storage container (14); or, operate in a reverse direction, with the electrochemical energy storage container (14) discharging the power grid (10); the charging and discharging directions are controlled by the energy management system (18), so that the offshore mobile barge photovoltaic energy storage power station can be quickly charged by the onshore power grid (10) and then go to an island or offshore platform with a shortage of electricity to supply power to loads.

9. The offshore floating barge photovoltaic energy storage power station according to claim 1, characterized in that: The energy storage power station system (6) controls the direct current and high-frequency alternating current converter (22) through the shore-based switch of the shore-based wireless charging and discharging system (9), converts the industrial frequency alternating current from the power generation end of the power grid (10) into direct current through the switch-controlled industrial frequency alternating current and direct current converter (21), and then converts it into high-frequency alternating current, and generates a changing strong magnetic field. The ship-based switch of the ship-based wireless charging and discharging system (7) controls the high-frequency alternating current and direct current converter (20) to receive the high-frequency alternating current energy generated by the changing magnetic field, and converts the high-frequency alternating current into direct current, and then connects it to the DC / DC rectifier (15) to dynamically adjust the voltage to be consistent with the outlet voltage of the electrochemical energy storage container (14), thereby realizing charging of the electrochemical energy storage container (14).

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