Underwater new-energy power supply system

Abstract

An underwater new-energy power supply system. The underwater new-energy power supply system comprises a plurality of new-energy power generation modules and a first direct-current transformer which are arranged on the surface of water, and a second direct-current transformer and a plurality of charging modules which are arranged underwater, wherein the first direct-current transformer comprises a plurality of first sub-modules; low-voltage sides of the first sub-modules are respectively connected to the corresponding new-energy power generation modules, and high-voltage sides of the first sub-modules are connected in series; the second direct-current transformer comprises a plurality of second sub-modules; high-voltage sides of the second sub-modules are connected in series and then connected to a high-voltage side of the first direct-current transformer, and low-voltage sides of the second sub-modules are connected in parallel; and input ends of the charging modules are respectively connected to the low-voltage sides of the corresponding second sub-modules, and output ends of the charging modules are respectively used for being connected to corresponding underwater electric devices. By means of the solution of the present application, a stable electric energy supply can be provided for underwater electric devices, thereby reducing the power supply cost of the underwater electric devices.

Description

An underwater new energy power supply system Technical Field

[0001] This invention relates to the field of underwater power supply technology, and in particular to an underwater new energy power supply system. Background Technology

[0002] The ocean has always been a crucial area for leading and driving the development of high-tech industries, with the deep sea being the forefront and commanding height of marine development and technology. In recent years, my country has emphasized the utilization and development of the ocean, making the goal of becoming a maritime power a key national strategic objective. The country has continuously increased investment and achieved breakthroughs in deep-sea exploration, construction operations, offshore oil and gas extraction, and deep-sea mineral development, developing underwater operational equipment such as manned submersibles, heavy-duty deep-sea mining vehicles, and trenching and cable-laying equipment. However, the energy carried by these underwater operational equipment is limited, and energy has become a bottleneck restricting its development.

[0003] In existing technologies, charging underwater equipment primarily involves bringing power from a land-based power source to a mother ship tens or even hundreds of kilometers away via a surface cable. The power is then transmitted from the surface to the seabed via the mother ship's electrical electronics equipment, where a charging station is established. This method requires bringing power from the land, resulting in high costs and generally low reliability.

[0004] Therefore, how to provide a solution to the above-mentioned technical problems is a technical problem that needs to be solved by those in the relevant technical field. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an underwater new energy power supply system that can provide a stable power supply for underwater electrical equipment and reduce the power supply cost of underwater electrical equipment.

[0006] This invention provides an underwater new energy power supply system, comprising:

[0007] Multiple new energy power generation modules and a first DC transformer are set on the water surface. The first DC transformer includes multiple first sub-modules. The low-voltage side of each first sub-module is connected to the corresponding new energy power generation module, and the high-voltage side of each first sub-module is connected in series.

[0008] The system includes a second DC transformer and multiple charging modules installed underwater. The second DC transformer comprises multiple second sub-modules. The high-voltage side of each second sub-module is connected in series to the high-voltage side of the first DC transformer. The low-voltage side of each second sub-module is connected in parallel. The input terminal of each charging module is connected to the low-voltage side of the corresponding second sub-module. The output terminal of each charging module is used to connect to the corresponding underwater electrical equipment.

[0009] Preferably, the new energy power generation module includes one or more of the following: photovoltaic power generation unit, wave power generation unit, and wind power generation unit.

[0010] Preferably, the photovoltaic power generation unit and the wave power generation unit are connected to the low-voltage side of the first submodule through a first DC / DC converter, and the wind power generation unit is connected to the low-voltage side of the first submodule through an AC / DC rectifier.

[0011] Preferably, the first submodule includes a first full-bridge unit, a first high-frequency transformer, and a second full-bridge unit connected in series.

[0012] Preferably, the first full-bridge unit includes four identical first switching devices, and the second full-bridge unit includes four identical first diodes.

[0013] Preferably, the first submodule further includes a first resonant capacitor, a first resonant inductor, and a first filter capacitor. The first resonant capacitor and the first resonant inductor are connected in series between the first full-bridge unit and the first high-frequency transformer, and the first filter capacitor is connected in parallel with the second full-bridge unit.

[0014] Preferably, the second submodule includes a third full-bridge unit, a second high-frequency transformer, and a fourth full-bridge unit connected in series.

[0015] Preferably, the third full-bridge unit includes four identical second switching devices, and the fourth full-bridge unit includes four identical second diodes.

[0016] Preferably, the second submodule further includes a second resonant capacitor, a second resonant inductor, and a second filter capacitor. The second resonant capacitor and the second resonant inductor are connected in series between the third full-bridge unit and the second high-frequency transformer, and the second filter capacitor is connected in parallel with the fourth full-bridge unit.

[0017] Preferably, the second DC transformer further includes multiple voltage-dividing capacitors, each of which is connected in parallel to the high-voltage side of the corresponding second submodule.

[0018] Preferably, the charging module is used to connect to underwater electrical equipment via wireless transmission.

[0019] Preferably, the charging module includes a DC / AC inverter and an energy transmitting unit. The two ends of the DC / AC inverter are connected to the low-voltage side of the second submodule and the energy transmitting unit, respectively. The energy transmitting unit is used to connect to the energy receiving unit of the underwater electrical equipment via wireless transmission.

[0020] Preferably, the charging module further includes a compensation unit, which is connected in series between the DC / AC inverter and the energy transmission unit to eliminate impedance in the circuit.

[0021] Preferably, the underwater new energy power supply system also includes an energy storage module installed underwater, which is connected to the low-voltage side of the second sub-module through a second DC / DC converter.

[0022] Preferably, the underwater new energy power supply system also includes a tidal power generation module installed underwater, which is connected to the low-voltage side of the second sub-module through a third DC / DC converter.

[0023] The present invention has at least the following beneficial effects:

[0024] This invention utilizes multiple new energy power generation modules and a first DC transformer on the water surface, and a second DC transformer and multiple charging modules underwater. The first DC transformer includes multiple first sub-modules, with the low-voltage side of each first sub-module connected to a corresponding new energy power generation module, and the high-voltage sides of each first sub-module connected in series. The second DC transformer includes multiple second sub-modules, with the high-voltage sides of each second sub-module connected in series and then connected to the high-voltage side of the first DC transformer, and the low-voltage sides of each second sub-module connected in parallel. The input terminals of each charging module are connected to the low-voltage sides of a corresponding second sub-module, and the output terminals of each charging module are used to connect to corresponding underwater electrical equipment. Because new energy power generation is directly utilized on the water surface, and the DC transformer on the water surface adopts an input parallel and output series scheme, while the DC transformer underwater adopts an input series and output parallel scheme, not only can the transmission lines be greatly shortened, but medium- and high-voltage DC power transmission from the water surface to the bottom can also be realized, thereby providing a stable power supply for underwater electrical equipment and reducing the power supply cost of underwater electrical equipment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of an underwater new energy power supply system provided in an embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of a new energy power generation module provided in an embodiment of the present invention;

[0028] Figure 3 is a circuit diagram of a first DC transformer provided in an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the structure of a second DC transformer provided in an embodiment of the present invention;

[0030] Figure 5 is a circuit diagram of a second DC transformer provided in an embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of the structure of a charging module provided in an embodiment of the present invention. Detailed Implementation

[0032] The core of this invention is to provide an underwater new energy power supply system that can provide a stable power supply for underwater electrical equipment and reduce the power supply cost of underwater electrical equipment.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides an underwater new energy power supply system. Please refer to Figures 1 to 6. The power supply system includes:

[0035] Multiple new energy power generation modules 100 and a first DC transformer 200 are set on the water surface. The first DC transformer 200 includes multiple first sub-modules 210. The low-voltage side of each first sub-module 210 is connected to the corresponding new energy power generation module 100, and the high-voltage side of each first sub-module 210 is connected in series.

[0036] A second DC transformer 300 and multiple charging modules 400 are installed underwater. The second DC transformer 300 includes multiple second sub-modules 310. The high-voltage side of each second sub-module 310 is connected in series to the high-voltage side of the first DC transformer 200. The low-voltage side of each second sub-module 310 is connected in parallel. The input terminal of each charging module 400 is connected to the low-voltage side of the corresponding second sub-module 310. The output terminal of each charging module 400 is used to connect to the corresponding underwater electrical equipment 500.

[0037] In this embodiment of the invention, multiple new energy power generation modules 100 are set up within a certain water area to form multiple groups of surface low-voltage DC microgrids. Each group of surface low-voltage DC microgrids serves as the low-voltage input of one of the first sub-modules 210 of the first DC transformer 200. Different surface low-voltage DC microgrids are input to different first sub-modules 210 of the first DC transformer 200. The first sub-modules 210 of the first DC transformer 200 convert the low-voltage DC voltage of each group into medium- and high-voltage DC voltage, and connect the high-voltage outputs of each first sub-module 210 in series to form a high-voltage DC voltage, which is then transmitted underwater. The underwater high-voltage DC voltage is then input to each of the second sub-modules 310 of the second DC transformer 300 after being divided in series. The second sub-modules 310 convert it into low-voltage DC voltage, and connect the low-voltage outputs of the second sub-modules 310 in parallel. Each second sub-module 310 is connected to a charging module 400, and the charging modules 400 form multiple underwater DC microgrids to provide power to the underwater electrical equipment 500. Understandably, since new energy sources are used to generate electricity directly on the water surface, and the DC transformer on the water surface adopts a parallel input and series output scheme, while the DC transformer underwater adopts a series input and parallel output scheme, not only can the transmission line be greatly shortened, but medium and high voltage DC power transmission from the water surface to the bottom can also be realized, thereby providing a stable power supply for the underwater electrical equipment 500 and reducing the power supply cost of the underwater electrical equipment 500.

[0038] Optionally, in the above embodiments, the new energy power generation module 100 includes one or more of a photovoltaic power generation unit, a wave power generation unit, and a wind power generation unit.

[0039] Furthermore, in the above embodiments, the photovoltaic power generation unit and the wave power generation unit are connected to the low-voltage side of the first submodule 210 through the first DC / DC converter, and the wind power generation unit is connected to the low-voltage side of the first submodule 210 through the AC / DC rectifier.

[0040] In this embodiment of the invention, each new energy power generation module 100 may include one or more photovoltaic power generation units, wave power generation units, and wind power generation units. Each photovoltaic power generation unit in each new energy power generation module 100 converts its output DC voltage to a preset DC voltage, such as 1500V DC voltage, through a first DC / DC converter, and connects it in parallel to a 1500V DC bus through the first DC / DC converter. Each wave power generation unit is also connected in parallel to a 1500V DC bus through a first DC / DC converter. The wind power generation unit converts its output AC voltage to 1500V DC voltage through an AC / DC rectifier and connects it in parallel to a DC bus through an AC / DC rectifier, forming a set of surface low-voltage DC microgrids, which serve as the low-voltage side input of one of the first sub-modules 210 of the first DC transformer 200. It is understandable that the location of photovoltaic power generation units fluctuates greatly, making it difficult to find the optimal position using traditional methods. However, this invention uses a DC / DC converter to achieve independent optimization of a single string of photovoltaic power generation units, and then combines them with wave power generation units and wind power generation units to form multiple DC microgrids, which are then input to the first DC transformer 200. This can improve the power generation efficiency of the photovoltaic power generation units and make the combination more flexible.

[0041] Optionally, in the above embodiments, the first submodule 210 includes a first full-bridge unit, a first high-frequency transformer HFT1, and a second full-bridge unit connected in series.

[0042] Furthermore, in the above embodiments, the first full-bridge unit includes four first switching devices with identical structures, and the second full-bridge unit includes four first diodes with identical structures.

[0043] Furthermore, in the above embodiments, the first submodule 210 further includes a first resonant capacitor C1, a first resonant inductor L1, and a first filter capacitor C2. The first resonant capacitor C1 and the first resonant inductor L1 are connected in series between the first full-bridge unit and the first high-frequency transformer HFT1, and the first filter capacitor C2 is connected in parallel with the second full-bridge unit.

[0044] In this embodiment of the invention, the first full-bridge unit includes four identical first switching devices, namely T1 and D1, T2 and D2, T3 and D3, and T4 and D4. The second full-bridge unit includes four identical first diodes, namely D5, D6, D7, and D8. The 1500V DC bus of the surface low-voltage DC microgrid serves as the DC input of the first full-bridge unit. Its output is resonated by the first resonant capacitor C1 and the first resonant inductor L1, then boosted by the first high-frequency transformer HFT1, and then rectified and filtered by the second full-bridge unit and the first filter capacitor C2 to output a medium-to-high voltage DC voltage. Finally, the outputs of each second full-bridge unit are connected in series to form a high-voltage DC voltage, which is then transmitted underwater.

[0045] Optionally, in the above embodiments, the second submodule 310 includes a third full-bridge unit, a second high-frequency transformer HFT2, and a fourth full-bridge unit connected in series.

[0046] Furthermore, in the above embodiments, the third full-bridge unit includes four identical second switching devices, and the fourth full-bridge unit includes four identical second diodes.

[0047] Furthermore, in the above embodiment, the second submodule 310 also includes a second resonant capacitor C3, a second resonant inductor L2, and a second filter capacitor C4. The second resonant capacitor C3 and the second resonant inductor L2 are connected in series between the third full-bridge unit and the second high-frequency transformer HFT2, and the second filter capacitor C4 is connected in parallel with the fourth full-bridge unit.

[0048] Optionally, in the above embodiments, the second DC transformer 300 further includes a plurality of voltage dividing capacitors C5, each of which is connected in parallel with the high-voltage side of the corresponding second submodule 310.

[0049] In this embodiment of the invention, the third full-bridge unit includes four identical second switching devices, namely T5 and D9, T6 and D9, and T6 and D9. 10 T7 and D 11 And T8 and D 12 The fourth full-bridge unit includes four identical second diodes, namely D... 13 D 14 D 15 and D 16 The high-voltage DC voltage at the water surface is divided in series by multiple voltage-dividing capacitors C5. The DC voltage of each voltage-dividing capacitor C5 serves as the DC input of the third full-bridge unit. Its output is then resonated by the second resonant capacitor C3 and the second resonant inductor L2, and then boosted by the second high-frequency transformer HFT2. Finally, it is rectified and filtered by the fourth full-bridge unit and the second filter capacitor C4 to output a low-voltage DC voltage. The outputs of each fourth full-bridge unit are connected in parallel to form an underwater 1500V DC bus.

[0050] Optionally, in the above embodiments, the charging module 400 is used to connect to the underwater electrical equipment 500 via wireless transmission.

[0051] Furthermore, in the above embodiment, the charging module 400 includes a DC / AC inverter 410 and an energy transmitting unit 420. The two ends of the DC / AC inverter 410 are respectively connected to the low-voltage side of the second sub-module 310 and the energy transmitting unit 420. The energy transmitting unit 420 is used to connect to the energy receiving unit of the underwater electrical equipment 500 through wireless transmission.

[0052] Furthermore, in the above embodiments, the charging module 400 also includes a compensation unit 430, which is connected in series between the DC / AC inverter 410 and the energy emission unit 420 to eliminate impedance in the circuit.

[0053] In this embodiment of the invention, the charging module 400 provides power to the underwater electrical equipment 500 via wireless transmission, avoiding the safety risks and low reliability associated with traditional contact charging methods such as wet plugging and unplugging, thus improving the safety and reliability of the equipment. Multiple DC / AC inverters 410 are connected in parallel to the underwater 1500V DC bus. After impedance elimination by compensation units 430, the power is transmitted to energy transmitting units 420. Energy receiving units of different underwater electrical equipment 500 are placed above different energy transmitting units 420, allowing the energy transmitting units 420 to provide power to the underwater electrical equipment 500 via wireless transmission. Specifically, the compensation unit 430 can be a compensation capacitor.

[0054] Optionally, in the above embodiments, the underwater new energy power supply system further includes an energy storage module 600 installed underwater, which is connected to the low-voltage side of the second sub-module 310 through a second DC / DC converter.

[0055] In this embodiment of the invention, when the power supply of the new energy power generation module 100 is greater than the power demand of the underwater electrical equipment 500, the energy storage module 600 can be charged and stored through the second DC / DC converter; when the power supply of the new energy power generation module 100 is less than the power demand of the underwater electrical equipment 500, the energy storage module 600 can provide temporary power to the underwater electrical equipment 500, thereby ensuring a stable power supply for the underwater electrical equipment 500. Specifically, the energy storage module 600 can be an energy storage battery.

[0056] Optionally, in the above embodiments, the underwater new energy power supply system further includes a tidal power generation module 700 installed underwater, which is connected to the low-voltage side of the second sub-module 310 through a third DC / DC converter.

[0057] In this embodiment of the invention, the tidal power generation module 700 installed underwater can generate electricity using tidal energy and is connected in parallel to the underwater 1500V DC bus via a third DC / DC converter to provide power to the underwater electrical equipment 500.

[0058] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should also be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An underwater new energy power supply system, characterized in that, include: Multiple new energy power generation modules and a first DC transformer are set on the water surface. The first DC transformer includes multiple first sub-modules. The low-voltage side of each first sub-module is connected to the corresponding new energy power generation module, and the high-voltage side of each first sub-module is connected in series. A second DC transformer and multiple charging modules are installed underwater. The second DC transformer includes multiple second sub-modules. The high-voltage side of each second sub-module is connected in series and then connected to the high-voltage side of the first DC transformer. The low-voltage side of each second sub-module is connected in parallel. The input terminal of each charging module is connected to the low-voltage side of the corresponding second sub-module. The output terminal of each charging module is used to connect to the corresponding underwater electrical equipment.

2. The underwater new energy power supply system according to claim 1, characterized in that, The new energy power generation module includes one or more of the following: photovoltaic power generation unit, wave power generation unit, and wind power generation unit.

3. The underwater new energy power supply system according to claim 2, characterized in that, The photovoltaic power generation unit and the wave power generation unit are connected to the low-voltage side of the first submodule through a first DC / DC converter, and the wind power generation unit is connected to the low-voltage side of the first submodule through an AC / DC rectifier.

4. The underwater new energy power supply system according to claim 1, characterized in that, The first submodule includes a first full-bridge unit, a first high-frequency transformer, and a second full-bridge unit connected in series.

5. The underwater new energy power supply system according to claim 4, characterized in that, The first full-bridge unit includes four identical first switching devices, and the second full-bridge unit includes four identical first diodes.

6. The underwater new energy power supply system according to claim 5, characterized in that, The first submodule further includes a first resonant capacitor, a first resonant inductor, and a first filter capacitor. The first resonant capacitor and the first resonant inductor are connected in series between the first full-bridge unit and the first high-frequency transformer, and the first filter capacitor is connected in parallel with the second full-bridge unit.

7. The underwater new energy power supply system according to claim 1, characterized in that, The second submodule includes a third full-bridge unit, a second high-frequency transformer, and a fourth full-bridge unit connected in series.

8. The underwater new energy power supply system according to claim 7, characterized in that, The third full-bridge unit includes four identical second switching devices, and the fourth full-bridge unit includes four identical second diodes.

9. The underwater new energy power supply system according to claim 8, characterized in that, The second submodule also includes a second resonant capacitor, a second resonant inductor, and a second filter capacitor. The second resonant capacitor and the second resonant inductor are connected in series between the third full-bridge unit and the second high-frequency transformer, and the second filter capacitor is connected in parallel with the fourth full-bridge unit.

10. The underwater new energy power supply system according to claim 1, characterized in that, The second DC transformer also includes multiple voltage-dividing capacitors, each of which is connected in parallel to the high-voltage side of the corresponding second submodule.

11. The underwater new energy power supply system according to claim 1, characterized in that, The charging module is used to connect to the underwater electrical equipment via wireless transmission.

12. The underwater new energy power supply system according to claim 11, characterized in that, The charging module includes a DC / AC inverter and an energy transmitting unit. The two ends of the DC / AC inverter are connected to the low-voltage side of the second sub-module and the energy transmitting unit, respectively. The energy transmitting unit is used to connect to the energy receiving unit of the underwater electrical equipment via wireless transmission.

13. The underwater new energy power supply system according to claim 12, characterized in that, The charging module also includes a compensation unit, which is connected in series between the DC / AC inverter and the energy transmitting unit to eliminate impedance in the circuit.

14. The underwater new energy power supply system according to claim 1, characterized in that, The underwater new energy power supply system also includes an energy storage module installed underwater, which is connected to the low-voltage side of the second sub-module through a second DC / DC converter.

15. The underwater new energy power supply system according to claim 1, characterized in that, The underwater new energy power supply system also includes a tidal power generation module installed underwater, which is connected to the low-voltage side of the second sub-module through a third DC / DC converter.

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