Underwater new energy power supply system

Abstract

The invention discloses an underwater new energy power supply system. The power supply system comprises a plurality of new energy power generation modules and a first direct-current transformer which are arranged on the water surface, and a second direct-current transformer and a plurality of charging modules which are arranged underwater, the first direct-current transformer comprises a plurality of first sub-modules, and the low-voltage side of each first sub-module is connected with the corresponding new energy power generation module; the first direct-current transformer comprises a plurality of first sub-modules, the high-voltage sides of the first sub-modules are connected in series, the second direct-current transformer comprises a plurality of second sub-modules, the high-voltage sides of the second sub-modules are connected with the high-voltage sides of the first direct-current transformer after being connected in series, and the low-voltage sides of the second sub-modules are connected in parallel; the input end of each charging module is connected with the low-voltage side of the corresponding second sub-module, and the output end of each charging module is used for being connected with the corresponding underwater electric equipment. According to the scheme, stable electric energy supply can be provided for the underwater electric equipment, and the power supply cost of the underwater electric equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater power supply, and in particular to an underwater new energy power supply system. Background Art

[0002] The ocean has always been an important field that leads and promotes the development of high-tech clusters, and the deep sea is the frontier and commanding heights of ocean development and marine technology development. In recent years, my country has attached great importance to the use and development of the ocean, and has made the development of a strong ocean nation an important strategic goal of the country. It has continuously increased investment and made breakthroughs in deep-sea exploration, construction operations, offshore oil and gas exploitation, and deep-sea mineral development. It has developed underwater operating equipment such as operational manned submersibles, deep-sea heavy-duty mining vehicles, trenching and cable laying. However, the energy carried by these underwater operating equipment is limited, and energy has become a bottleneck problem restricting the development of underwater operating equipment.

[0003] In the existing technology, underwater equipment is mainly charged by using a power source on land and shore to lead the power to a mother ship tens of kilometers or even hundreds of kilometers away through a sea cable. After passing through the power electronic equipment on the mother ship, the power is transported from the water surface to the bottom of the water, and a charging station is built underwater. This method requires the introduction of power from the land shore, which is costly and has average reliability.

[0004] In view of this, how to provide a solution that can solve the above technical problems is a technical problem that people in the relevant technical field need to solve. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an underwater new energy power supply system, which can provide a stable power supply for underwater electrical equipment and reduce the power supply cost of underwater electrical equipment.

[0006] The present invention provides an underwater new energy power supply system, comprising: A plurality of new energy power generation modules and a first DC transformer are arranged on the water surface, wherein the first DC transformer comprises a plurality of first submodules, the low voltage side of each first submodule is respectively connected to the corresponding new energy power generation module, and the high voltage side of each first submodule is connected in series; A second DC transformer and multiple charging modules are arranged underwater, the second DC transformer includes multiple second sub-modules, the high-voltage sides of the respective second sub-modules are connected in series and connected to the high-voltage side of the first DC transformer, the low-voltage sides of the respective second sub-modules are connected in parallel, the input ends of the respective charging modules are respectively connected to the low-voltage sides of the corresponding second sub-modules, and the output ends of the respective charging modules are respectively used to be connected to the corresponding underwater electrical equipment.

[0007] Preferably, the new energy power generation module includes one or more of a photovoltaic power generation unit, a wave power generation unit and a wind power generation unit.

[0008] Preferably, the photovoltaic power generation unit and the wave power generation unit are connected to the low voltage side of the first submodule via a first DC / DC converter, and the wind power generation unit is connected to the low voltage side of the first submodule via an AC / DC rectifier.

[0009] Preferably, the first submodule includes a first full-bridge unit, a first high-frequency transformer and a second full-bridge unit which are connected in series in sequence.

[0010] Preferably, the first full-bridge unit includes four first switch devices with the same structure, and the second full-bridge unit includes four first diodes with the same structure.

[0011] Preferably, the first submodule also 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.

[0012] Preferably, the second submodule includes a third full-bridge unit, a second high-frequency transformer and a fourth full-bridge unit which are connected in series in sequence.

[0013] Preferably, the third full-bridge unit includes four second switch devices with the same structure, and the fourth full-bridge unit includes four second diodes with the same structure.

[0014] Preferably, 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.

[0015] Preferably, the second DC transformer further includes a plurality of voltage-dividing capacitors, each of which is connected in parallel to the high-voltage side of the corresponding second submodule.

[0016] Preferably, the charging module is used to connect to the underwater electrical equipment by wireless transmission.

[0017] Preferably, the charging module includes a DC / AC inverter and an energy transmitting unit, the two ends of the DC / AC inverter are respectively connected to the low-voltage side of the second submodule and the energy transmitting unit, and the energy transmitting unit is used to connect to the energy receiving unit of the underwater electrical equipment through wireless transmission.

[0018] Preferably, the charging module further comprises a compensation unit, which is connected in series between the DC / AC inverter and the energy transmitting unit to eliminate impedance in the circuit.

[0019] Preferably, the underwater new energy power supply system further comprises an energy storage module arranged underwater, and the energy storage module is connected to the low voltage side of the second submodule via a second DC / DC converter.

[0020] Preferably, the underwater new energy power supply system also includes a tidal power generation module arranged underwater, and the tidal power generation module is connected to the low voltage side of the second submodule through a third DC / DC converter.

[0021] The present invention has at least the following beneficial effects: The present invention arranges a plurality of new energy power generation modules and a first direct current transformer on the water surface and arranges a second direct current transformer and a plurality of charging modules underwater. The first direct current transformer comprises a plurality of first submodules, the low voltage side of each first submodule is respectively connected to the corresponding new energy power generation module, and the high voltage side of each first submodule is connected in series. The second direct current transformer comprises a plurality of second submodules, the high voltage side of each second submodule is connected in series with the high voltage side of the first direct current transformer, and the low voltage side of each second submodule is connected in parallel. The input end of each charging module is respectively connected to the low voltage side of the corresponding second submodule, and the output end of each charging module is respectively used to be connected to the corresponding underwater electrical equipment. Since the new energy power generation is directly utilized on the water surface, and the direct current transformer on the water surface adopts the input parallel connection and output series connection scheme, while the underwater direct current transformer adopts the input series connection and output parallel connection scheme, not only the transmission line can be greatly shortened, but also medium and high voltage direct current transmission from the water surface to the bottom can be realized, so as to provide a stable power supply for the underwater electrical equipment and reduce the power supply cost of the underwater electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an underwater new energy power supply system provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a new energy power generation module provided by an embodiment of the present invention; Figure 3 A circuit structure diagram of a first DC transformer provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a second DC transformer provided in an embodiment of the present invention; Figure 5 A circuit structure diagram of a second DC transformer provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a charging module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The core of the present invention is to provide an underwater new energy power supply system, which can provide a stable power supply for underwater electrical equipment and reduce the power supply cost of underwater electrical equipment.

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The embodiment of the present invention provides an underwater new energy power supply system, please refer to Figures 1 to 6 , the power supply system comprises: A plurality of new energy power generation modules 100 and a first DC transformer 200 are arranged on the water surface, wherein the first DC transformer 200 includes a plurality of first submodules 210, wherein the low voltage side of each first submodule 210 is respectively connected to the corresponding new energy power generation module 100, and the high voltage side of each first submodule 210 is connected in series; A second DC transformer 300 and a plurality of charging modules 400 are arranged underwater. The second DC transformer 300 includes a plurality of second submodules 310. The high-voltage sides of the second submodules 310 are connected in series and connected to the high-voltage side of the first DC transformer 200. The low-voltage sides of the second submodules 310 are connected in parallel. The input ends of the charging modules 400 are respectively connected to the low-voltage sides of the corresponding second submodules 310. The output ends of the charging modules 400 are respectively used to be connected to the corresponding underwater electrical equipment 500.

[0027] In the embodiment of the present invention, a plurality of new energy power generation modules 100 are arranged in a certain water area to form a plurality of groups of low-voltage DC microgrids on the water surface. Each group of low-voltage DC microgrids on the water surface is used as the low-voltage side input of one of the first submodules 210 of the first DC transformer 200, and different low-voltage DC microgrids on the water surface are input to different first submodules 210 of the first DC transformer 200. The low-voltage DC voltage of each group is converted into a medium-high voltage DC voltage by the first submodule 210 of the first DC transformer 200, and the high-voltage side outputs of each first submodule 210 are connected in series to form a high-voltage DC voltage, which is then transmitted underwater. The underwater high-voltage DC voltage is input into each second submodule 310 of the second DC transformer 300 after series voltage division, and is converted into a low-voltage DC voltage by the second submodule 310, and the low-voltage side outputs of the second submodule 310 are connected in parallel. Each second submodule 310 is respectively connected to a charging module 400, and each charging module 400 forms a plurality of underwater DC microgrids to provide power supply to the underwater electrical equipment 500. It can be understood that since new energy is used to generate electricity directly on the water surface, and the DC transformer on the water surface adopts an input parallel and output series scheme, while the underwater DC transformer adopts an input series and output parallel scheme, not only can the transmission line be greatly shortened, but also medium and high voltage DC transmission from the water surface to the bottom of the water can 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.

[0028] Optionally, in the above embodiment, 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.

[0029] Furthermore, in the above embodiment, 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.

[0030] In an embodiment of the present 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, wherein each photovoltaic power generation unit in each new energy power generation module 100 converts the DC voltage output by it into a preset DC voltage, for example, into a 1500V DC voltage, through a first DC / DC converter, and is connected in parallel to the 1500V DC bus through the first DC / DC converter, each wave power generation unit is also connected in parallel to the 1500V DC bus through a first DC / DC converter, and the wind power generation unit converts the AC voltage output by it into a 1500V DC voltage through an AC / DC rectifier, and is connected in parallel to the DC bus through the AC / DC rectifier, forming a group of water surface low-voltage DC microgrids, which serve as the low-voltage side input of one of the first submodules 210 of the first DC transformer 200. It is understandable that the position of the photovoltaic power generation unit fluctuates greatly, and it is difficult to find the overall optimization through traditional methods. The embodiment of the present invention realizes independent optimization of a single string of photovoltaic power generation units through a DC / DC converter, and then forms multiple DC microgrids with wave power generation units and wind power generation units, etc., and inputs them into the first DC transformer 200. This can make the power generation efficiency of the photovoltaic power generation unit higher and the combination method more flexible.

[0031] Optionally, in the above embodiment, the first submodule 210 includes a first full-bridge unit, a first high-frequency transformer HFT1 and a second full-bridge unit which are sequentially connected in series.

[0032] Furthermore, in the above embodiment, the first full-bridge unit includes four first switch devices with the same structure, and the second full-bridge unit includes four first diodes with the same structure.

[0033] Furthermore, in the above embodiment, the first submodule 210 also 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.

[0034] In the embodiment of the present invention, the first full-bridge unit includes four first switch devices with the same structure, namely T1 and D1, T2 and D2, T3 and D3, and T4 and D4, and the second full-bridge unit includes four first diodes with the same structure, namely D5, D6, D7, and D8. The 1500V DC bus of the surface low-voltage DC microgrid is used as the DC input of the first full-bridge unit, and its output is resonated by the first resonant capacitor C1 and the first resonant inductor L1, and 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 medium and high voltage DC voltage. Finally, the outputs of the second full-bridge units are connected in series to form a high-voltage DC voltage, which is then transmitted underwater.

[0035] Optionally, in the above embodiment, the second submodule 310 includes a third full-bridge unit, a second high-frequency transformer HFT2 and a fourth full-bridge unit which are sequentially connected in series.

[0036] Furthermore, in the above embodiment, the third full-bridge unit includes four second switch devices with the same structure, and the fourth full-bridge unit includes four second diodes with the same structure.

[0037] 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.

[0038] Optionally, in the above embodiment, the second DC transformer 300 further includes a plurality of voltage-dividing capacitors C5 , and each of the voltage-dividing capacitors C5 is connected in parallel to the high-voltage side of the corresponding second submodule 310 .

[0039] In the embodiment of the present invention, the third full-bridge unit includes four second switch devices with the same structure, namely T5 and D9, T6 and D 10 , T7 and D 11 As well as T8 and D 12 The fourth full-bridge unit includes four second diodes with the same structure, namely D 13 , D 14 , D 15 and D 16 The high-voltage DC voltage on the surface is divided in series by multiple voltage-dividing capacitors C5. The DC voltage of each voltage-dividing capacitor C5 is used as the DC input of the third full-bridge unit. Its output is resonated by the second resonant capacitor C3 and the second resonant inductor L2, and then boosted by the second high-frequency transformer HFT2. Then, it is rectified and filtered by the fourth full-bridge unit and the second filter capacitor C4 to output a low-voltage DC voltage. Finally, the outputs of each fourth full-bridge unit are connected in parallel to form an underwater 1500V DC bus.

[0040] Optionally, in the above embodiment, the charging module 400 is used to connect to the underwater electrical equipment 500 by wireless transmission.

[0041] Furthermore, in the above embodiment, the charging module 400 includes a DC / AC inverter 410 and an energy transmitting unit 420, and the two ends of the DC / AC inverter 410 are respectively connected to the low-voltage side of the second submodule 310 and the energy transmitting unit 420, and the energy transmitting unit 420 is used to connect to the energy receiving unit of the underwater electrical equipment 500 through wireless transmission.

[0042] Furthermore, in the above embodiment, the charging module 400 further includes a compensation unit 430, which is connected in series between the DC / AC inverter 410 and the energy transmitting unit 420 to eliminate impedance in the circuit.

[0043] In an embodiment of the present invention, the charging module 400 provides power supply to the underwater electrical equipment 500 by wireless transmission, which can avoid the problems of high safety risk and low reliability of wet plugging and unplugging of charging in traditional contact charging methods, thereby improving the safety and reliability of the equipment. Among them, multiple DC / AC inverters 410 are connected in parallel to the underwater 1500V DC bus, and are respectively transmitted to the energy transmitting unit 420 after eliminating impedance through the compensation unit 430. The energy receiving units of different underwater electrical equipment 500 are placed above different energy transmitting units 420, and the energy transmitting unit 420 can provide power supply to the underwater electrical equipment 500 by wireless transmission. Specifically, the compensation unit 430 can be a compensation capacitor.

[0044] Optionally, in the above embodiment, the underwater new energy power supply system further includes an energy storage module 600 disposed underwater, and the energy storage module 600 is connected to the low voltage side of the second submodule 310 via a second DC / DC converter.

[0045] In the embodiment of the present invention, when the power supply of the new energy power generation module 100 is greater than the power demand of the underwater power equipment 500, the second DC / DC converter can be used to charge and store energy for the energy storage module 600; when the power supply of the new energy power generation module 100 is less than the power demand of the underwater power equipment 500, the energy storage module 600 can be used to provide temporary power supply for the underwater power equipment 500, thereby ensuring a stable power supply for the underwater power equipment 500. Specifically, the energy storage module 600 can be an energy storage battery.

[0046] Optionally, in the above embodiment, the underwater new energy power supply system also includes a tidal power generation module 700 disposed underwater, and the tidal power generation module 700 is connected to the low voltage side of the second submodule 310 through a third DC / DC converter.

[0047] In the embodiment of the present invention, the tidal power generation module 700 disposed underwater can generate electricity using tidal energy, and is connected in parallel to the underwater 1500V DC bus through a third DC / DC converter to provide power supply for the underwater electrical equipment 500.

[0048] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. It should also be noted that in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the element.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to 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: A plurality of new energy power generation modules and a first DC transformer are arranged on the water surface, wherein the first DC transformer comprises a plurality of first submodules, the low voltage side of each of the first submodules is respectively connected to the corresponding new energy power generation module, and the high voltage side of each of the first submodules is connected in series; A second DC transformer and multiple charging modules are arranged underwater, wherein the second DC transformer includes multiple second sub-modules, the high-voltage sides of each of the second sub-modules are connected in series and connected to the high-voltage side of the first DC transformer, the low-voltage sides of each of the second sub-modules are connected in parallel, the input ends of each of the charging modules are respectively connected to the low-voltage sides of the corresponding second sub-modules, and the output ends of each of the charging modules are respectively used to be connected to 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 a photovoltaic power generation unit, a wave power generation unit and a wind power generation unit.

3. The underwater new energy power supply system according to claim 2 is 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 which are connected in series in sequence.

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

6. The underwater new energy power supply system according to claim 5, characterized in that: The first submodule also 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 which are sequentially 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 second switch devices with the same structure, and the fourth full-bridge unit includes four second diodes with the same structure.

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 further includes a plurality of 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 be connected to the underwater electrical equipment by 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 respectively connected to the low-voltage side of the second submodule and the energy transmitting unit. The energy transmitting unit is used to connect to the energy receiving unit of the underwater electrical equipment through wireless transmission.

13. The underwater new energy power supply system according to claim 12, characterized in that: The charging module further 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 arranged underwater, and the energy storage module is connected to the low-voltage side of the second submodule 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 arranged underwater, and the tidal power generation module is connected to the low-voltage side of the second submodule through a third DC / DC converter.

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