Damp-proof and dehumidification system and method for offshore wind turbine generator

Abstract

The invention discloses a moisture-proof dehumidification system for an offshore wind turbine generator. The moisture-proof dehumidification system comprises a wave energy power generation device, a distributed network construction energy storage device, a dehumidification device, a multi-port direct-current converter and a wind turbine generator power port, the wave energy power generation device is electrically connected with the dehumidification device through the multi-port direct-current converter and supplies power to the dehumidification device of the wind turbine generator set. And / or the distributed networking energy storage device is electrically connected with the dehumidification device through the multi-port direct-current converter and supplies power to the dehumidification device of the wind turbine generator; and / or the power supply port of the wind turbine generator is electrically connected with the dehumidification device through the multi-port direct-current converter to supply power to the dehumidification device of the wind turbine generator. According to the invention, moisture prevention and dehumidification of wave power generation are realized, and a multi-energy multi-port driving power generation scheme and a multi-port control scheme are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to offshore wind turbine, in particular to a kind of offshore wind turbine moisture-proof dehumidification system. BACKGROUND

[0002] Offshore wind power refers to the power generation mode of generating electricity through the wind power plant built on the sea. Offshore wind power has the characteristics of rich resources, high power generation utilization hours, no land occupation and suitable for large-scale development, and is the latest frontier of global wind power development.

[0003] The working environment of offshore wind power is very humid, and a stable dehumidification device is needed, otherwise long-term operation in a humid environment will cause equipment corrosion, rust, etc., which seriously affects the normal operation of the equipment. At present, the offshore wind power dehumidification technology has the following disadvantages: 1. Offshore high humidity and high salt environment causes corrosion of equipment inside the fan. Before the offshore booster station or offshore converter station is put into operation, there is no voltage support for the offshore wind turbine direct current bus, and the generator set cannot be self-started, which causes the unit to be unable to generate electricity and cannot be self-powered and self-dehumidified. 2. The traditional moisture-proof dehumidification scheme relies on external power supply, which is not suitable for no network scene. 3. The traditional moisture-proof dehumidification scheme uses diesel generator, which is high in cost and not environmentally friendly. SUMMARY

[0004] The purpose of the present application is to provide a kind of offshore wind turbine moisture-proof dehumidification system, realize wave energy power generation moisture-proof dehumidification, realize a variety of energy multi-port driving power generation scheme, multi-port control scheme.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A kind of offshore wind turbine moisture-proof dehumidification system, including wave energy power generation device, distributed network energy storage device, dehumidification device, multi-port DC converter and wind turbine power port;Wave energy power generation device is electrically connected through multi-port DC converter and dehumidification device, and is used to power the dehumidification device of wind turbine;And / or distributed network energy storage device is electrically connected through multi-port DC converter and dehumidification device, and is used to power the dehumidification device of wind turbine;And / or wind turbine power port is electrically connected through multi-port DC converter and dehumidification device, and is used to power the dehumidification device of wind turbine.

[0007] In the foregoing offshore wind turbine moisture-proof dehumidification system, the wind turbine includes blades, a gear box, a generator, a machine-side frequency converter, a grid-side frequency converter, a main circuit breaker, a booster transformer and a high-voltage switch cabinet, the input shaft of the blades and the gear box is drivingly connected, the output shaft of the gear box and the generator are drivingly connected, and the generator, the machine-side frequency converter, the grid-side frequency converter, the main circuit breaker, the booster transformer and the high-voltage switch cabinet are electrically connected in sequence;The wire between the machine-side frequency converter and the grid-side frequency converter is electrically connected through the multi-port DC converter and the dehumidification device, and is used to power the dehumidification device of the wind turbine.

[0008] The offshore wind turbine moisture-proof and dehumidification system as claimed in the preceding claim, wherein the number of wind turbines is greater than or equal to 2, and the high-voltage switch cabinets of the wind turbines are connected in sequence through high-voltage submarine cables.

[0009] The offshore wind turbine moisture-proof and dehumidification system as claimed in the preceding claim, wherein the wind turbine comprises blades, a generator, a machine-side frequency converter, a grid-side frequency converter, a main circuit breaker, a step-up transformer, and a high-voltage switch cabinet, the blades and the generator are drivingly connected, and the generator, the machine-side frequency converter, the grid-side frequency converter, the main circuit breaker, the step-up transformer, and the high-voltage switch cabinet are electrically connected in sequence; the generator is a permanent magnet generator; and the wires between the machine-side frequency converter and the grid-side frequency converter are electrically connected through the multi-port DC converter and the dehumidification device to supply power to the dehumidification device of the wind turbine.

[0010] The offshore wind turbine moisture-proof and dehumidification system as claimed in the preceding claim, wherein the wind turbine comprises blades, a gearbox, a generator, a machine-side frequency converter, a grid-side frequency converter, a main circuit breaker, a step-up transformer, and a high-voltage switch cabinet, the input shafts of the blades and the gearbox are drivingly connected, the output shaft of the gearbox and the generator are drivingly connected, and the generator, the machine-side frequency converter, the grid-side frequency converter, the main circuit breaker, the step-up transformer, and the high-voltage switch cabinet are electrically connected in sequence; the generator is a double feedback generator, and a contactor is connected in series between the generator and the main circuit breaker; and the wires between the machine-side frequency converter and the grid-side frequency converter are electrically connected through the multi-port DC converter and the dehumidification device to supply power to the dehumidification device of the wind turbine.

[0011] The offshore wind turbine moisture-proof and dehumidification system as claimed in the preceding claim, wherein the self-use power of the wind turbine is electrically connected to the dehumidification device to supply power to the dehumidification device.

[0012] A moisture-proof and dehumidification method for offshore wind turbines, which adopts the offshore wind turbine moisture-proof and dehumidification system as claimed in the preceding claim, and comprises the following contents: light dehumidification: generating power by using the wave energy power generation device, transmitting the power to the dehumidification device through the multi-port DC converter to prevent moisture and dehumidify, and storing the excess power in the distributed networked energy storage device through the multi-port DC converter; deep dehumidification: generating power by using the offshore wind turbine, transmitting the power to the dehumidification device through the multi-port DC converter to prevent moisture and dehumidify, and storing the excess power in the distributed networked energy storage device through the multi-port DC converter.

[0013] The preceding offshore wind turbine moisture-proof and dehumidification method further comprises the following contents: the wave energy power generation device generates electricity, the electricity is stored in the distributed network energy storage device through the multi-port direct current converter, the distributed network energy storage device charges the offshore wind turbine converter DC bus through the multi-port direct current converter, the voltage is raised to the rated value, the offshore wind turbine network side converter is unlocked, the preset frequency and voltage are output by adopting the network control strategy, the offshore wind turbine is started when the external wind speed meets the starting condition, and self-starting is realized, and wind energy is converted into electric energy.

[0014] The preceding offshore wind turbine moisture-proof and dehumidification method further comprises the following contents: the first wind turbine provides an alternating current or direct current power supply for adjacent wind turbines, the next wind turbine is started by closing the main circuit breaker of the wind turbine, and the wind turbines are gradually expanded to the whole loop, so that the wind turbines are started one by one; the distributed network energy storage device is not used when the subsequent wind turbines are started, a path is formed by closing the switch of the high-voltage switch cabinet on the loop, and the wind turbines are started one by one; after all the wind turbines are started, the active power is gradually increased, the offshore wind power generation power is controlled, the moisture-proof and dehumidification, lighting and other self-use electric functions are met, the excess electric energy is converted into energy and stored in the distributed network energy storage device, and the wind turbine does not over-release after the energy storage is completed.

[0015] Compared with the prior art, the wave energy power generation moisture-proof and dehumidification is realized, a variety of energy multi-port driving power generation schemes and multi-port control schemes are realized, and the following advantages are achieved: 1 the energy storage device simulates the synchronous machine characteristics to establish the DC bus voltage and trigger the wind turbine circuit breaker to be closed; 2 the first or last wind turbine is electrified, and all the wind turbines on the loop current collection circuit are sequentially driven to be electrified; 3 the distributed network energy storage device and the loop current collection circuit form a microgrid; 4 the wave energy is directly driven to the multi-port dehumidifier; 5 the wind turbine is self-powered and dehumidified. The problem of dehumidification and self-use electricity of the offshore wind turbine during the construction of the offshore booster station or the offshore converter station is completely solved. Test results show that the efficiency is improved by 99%, the reliability is improved by 1 times, the cost is reduced by 50%, and the operation convenience is improved by 50%. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the first embodiment of the present application;

[0017] Figure 2 is a schematic diagram of the second embodiment of the present application;

[0018] Figure 3 is a schematic diagram of the third embodiment of the present application;

[0019] Figure 4 is a schematic diagram of the fourth embodiment of the present application;

[0020] Figure 5 is a schematic diagram of the fifth embodiment of the present application;

[0021] Figure 6 is the schematic diagram of the sixth embodiment of the present application.

[0022] Fig. 1 is a wave energy power generation device, 2 is a distributed network energy storage device, 3 is a dehumidification device, 4 is a multi-port DC converter, 5 is a wind turbine power supply port, 6 is a blade, 7 is a gearbox, 8 is a generator, 9 is a machine side frequency converter, 10 is a network side frequency converter, 11 is a step-up transformer, 12 is a high-voltage switch cabinet, 13 is a contactor, 14 is self-use electricity, and 15 is a main circuit breaker.

[0023] The present application will be further described below in conjunction with the drawings and specific embodiments. EMBODIMENT

[0024] Embodiment 1 of the present application: as shown in Figure 1 A marine wind turbine dehumidification system, comprising a wave energy power generation device 1, a distributed network energy storage device 2, a dehumidification device 3, a multi-port DC converter 4 and a wind turbine power supply port 5; the wave energy power generation device 1 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the distributed network energy storage device 2 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the wind turbine power supply port 5 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine.

[0025] Embodiment 2: as shown in Figure 2 A marine wind turbine dehumidification system, comprising a wave energy power generation device 1, a distributed network energy storage device 2, a dehumidification device 3, a multi-port DC converter 4 and a wind turbine power supply port 5; the wave energy power generation device 1 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the distributed network energy storage device 2 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the wind turbine power supply port 5 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine.

[0026] The wind turbine comprises a blade 6, a gearbox 7, a generator 8, a machine side frequency converter 9, a network side frequency converter 10, a main circuit breaker 15, a step-up transformer 11 and a high-voltage switch cabinet 12, the input shaft of the blade 6 and the gearbox 7 are drivingly connected, the output shaft of the gearbox 7 and the generator 8 are drivingly connected, and the generator 8, the machine side frequency converter 9, the network side frequency converter 10, the main circuit breaker 15, the step-up transformer 11 and the high-voltage switch cabinet 12 are electrically connected in sequence; the wires between the machine side frequency converter 9 and the network side frequency converter 10 are electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine.

[0027] Example 3: As Figure 3 As shown, an offshore wind turbine dehumidification system includes a wave energy generation device 1, a distributed grid energy storage device 2, a dehumidification device 3, a multi-port DC-DC converter 4, and a wind turbine power port 5. The wave energy generation device 1 is electrically connected to the dehumidification device 3 via the multi-port DC-DC converter 4 to supply power to the dehumidification device 3 of the wind turbine. And / or the distributed grid energy storage device 2 is electrically connected to the dehumidification device 3 via the multi-port DC-DC converter 4 to supply power to the dehumidification device 3 of the wind turbine. And / or the wind turbine power port 5 is electrically connected to the dehumidification device 3 via the multi-port DC-DC converter 4 to supply power to the dehumidification device 3 of the wind turbine.

[0028] The number of wind turbine units is greater than or equal to 2, and the high-voltage switchgear 12 of the wind turbine units is connected in sequence via high-voltage submarine cables.

[0029] Example 4: Figure 4 As shown, an offshore wind turbine dehumidification system includes a wave energy generation device 1, a distributed grid energy storage device 2, a dehumidification device 3, a multi-port DC-DC converter 4, and a wind turbine power port 5. The wave energy generation device 1 is electrically connected to the dehumidification device 3 via the multi-port DC-DC converter 4 to supply power to the dehumidification device 3 of the wind turbine. And / or the distributed grid energy storage device 2 is electrically connected to the dehumidification device 3 via the multi-port DC-DC converter 4 to supply power to the dehumidification device 3 of the wind turbine. And / or the wind turbine power port 5 is electrically connected to the dehumidification device 3 via the multi-port DC-DC converter 4 to supply power to the dehumidification device 3 of the wind turbine.

[0030] The wind turbine includes blades 6, a generator 8, a machine-side frequency converter 9, a grid-side frequency converter 10, a main circuit breaker 15, a step-up transformer 11, and a high-voltage switchgear 12. Blades 6 and generator 8 are connected by a drive, and generator 8, machine-side frequency converter 9, grid-side frequency converter 10, main circuit breaker 15, step-up transformer 11, and high-voltage switchgear 12 are connected in sequence by an electrical connection. The generator 8 is a permanent magnet generator. The wires between machine-side frequency converter 9 and grid-side frequency converter 10 are electrically connected to a dehumidification device 3 via a multi-port DC-DC converter 4, which supplies power to the dehumidification device 3 of the wind turbine.

[0031] Example 5: Figure 5As shown in the figure, a marine wind turbine moisture-proof dehumidification system includes a wave energy power generation device 1, a distributed network energy storage device 2, a dehumidification device 3, a multi-port DC converter 4 and a wind turbine power supply port 5; the wave energy power generation device 1 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the distributed network energy storage device 2 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the wind turbine power supply port 5 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine.

[0032] The wind turbine includes blades 6, a gear box 7, a generator 8, a machine side converter 9, a grid side converter 10, a main circuit breaker 15, a step-up transformer 11 and a high-voltage switch cabinet 12, the input shaft of the blades 6 and the gear box 7 are drivingly connected, the output shaft of the gear box 7 and the generator 8 are drivingly connected, and the generator 8, the machine side converter 9, the grid side converter 10, the main circuit breaker 15, the step-up transformer 11 and the high-voltage switch cabinet 12 are electrically connected in sequence; the generator 8 is a double feedback generator 8, and a contactor 13 is connected in series between the generator 8 and the main circuit breaker 15; the wires between the machine side converter 9 and the grid side converter 10 are electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine.

[0033] Embodiment 6: as Figure 6 As shown in the figure, a marine wind turbine moisture-proof dehumidification system includes a wave energy power generation device 1, a distributed network energy storage device 2, a dehumidification device 3, a multi-port DC converter 4 and a wind turbine power supply port 5; the wave energy power generation device 1 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the distributed network energy storage device 2 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine; and / or the wind turbine power supply port 5 is electrically connected through the multi-port DC converter 4 and the dehumidification device 3 to supply power to the dehumidification device 3 of the wind turbine. The self-use power 14 of the wind turbine and the dehumidification device 3 are electrically connected to supply power to the dehumidification device 3.

[0034] (1) Shallow dehumidification: trigger the I section dehumidification threshold of the marine wind turbine, use wave energy power generation to drive multi-port to prevent moisture and dehumidify. The wave energy device generates power, which is converted through the multi-port DC / DC / DC / DC converter to dehumidify the dehumidification module or dehumidifier, and the excess power is stored in the distributed network energy storage device. As shown in Figure (1)

[0035] (2) Deep dehumidification: Trigger the offshore wind turbine II section dehumidification threshold, use offshore wind turbine power generation for moisture-proof dehumidification. The offshore wind turbine releases the brake, the brake system is released, and the wind wheel is in a free state. The variable pitch system acts, and the blade pitch angle is adjusted from the feathering position to the starting angle to capture wind energy. The wind wheel starts to rotate slowly, and the low-speed idling.

[0036] Wave energy equipment generates electricity, and through the multi-port DC / DC / DC / DC converter, electrical energy is stored in the distributed network energy storage equipment. The distributed network energy storage equipment charges the offshore wind turbine converter DC bus through the multi-port DC2 / DC4, and the voltage rises to the rated value. Unlock the offshore wind turbine grid-side converter, adopt the network control strategy, output the preset frequency and voltage, and start the offshore wind turbine when the external wind speed meets the starting condition to realize self-starting and convert wind energy into electrical energy.

[0037] The first wind turbine provides AC or DC power for the adjacent wind turbine, and the next one is started by closing the fan circuit breaker, and gradually expanded to the entire loop wind turbine to realize the start of other wind turbines. As shown in Figure (3)

[0038] Another solution: The subsequent wind turbine can not use the distributed network energy storage equipment when starting, and the high-voltage switch cabinet switch on the loop is closed to start the wind turbine in turn. After all the wind turbines are started, the active power is gradually increased to effectively control the offshore wind power generation power, meet the moisture-proof dehumidification, lighting and other self-use electricity functions, and the excess electrical energy is converted into energy storage in the distributed network energy storage equipment. After energy storage is completed, the wind turbine does not need to be over-released.

[0039] 3) Wave energy, offshore wind turbine, distributed network energy storage, dehumidification module or dehumidification system constitute a microgrid system.

[0040] 4) The multi-port DC / DC / DC / DC converter system( Figure 1 ) is also used for gearless offshore wind turbines.

[0041] 6) The offshore wind turbine of the permanent magnet generator.

[0042] 5) The multi-port DC / DC / DC / DC converter system( Figure 1 ) is also used for offshore wind turbines with double-fed generators.

[0043] 6) The multi-port DC / DC / DC / DC converter system( Figure 1 ) is also used for DC offshore wind turbines, and serial number 9 is DC / DC, serial numbers 10, 11, and 12 are DC devices.

[0044] 7) Dehumidification control logic: the controller is connected to wave energy generation, offshore wind turbine generation, distributed grid-forming energy storage, multi-port DC / DC / DC / DC converter, dehumidification module, and turbine self-use power.

[0045] Triggering the offshore wind turbine I section dehumidification threshold, using wave energy generation to drive the multi-port for shallow moisture-proof dehumidification. Triggering the offshore wind turbine II section dehumidification threshold, using distributed grid-forming energy storage to charge the offshore wind turbine converter DC bus through multi-port DC2 / DC4, realizing wind turbine self-start, offshore wind turbine generation for rapid deep moisture-proof dehumidification. Part of the wave energy generation and offshore wind turbine generation is used for dehumidification, lighting, and self-use power, and the rest is stored in the distributed grid-forming energy storage device.

[0046] Compared with the prior art, the present scheme has the following advantages:

[0047] (1) Realize wave energy generation dehumidification;

[0048] (2) Realize distributed grid-forming energy storage to simulate synchronous machine characteristics to establish DC bus voltage and trigger circuit breaker closing;

[0049] (3) Realize offshore generator self-start (black start); Self-dehumidification;

[0050] (4) Realize multi-port driving generation scheme of multiple energy sources, multi-port control scheme;

[0051] (5) Realize energy-saving and environment-friendly dehumidification of offshore booster station or offshore converter station before operation;

[0052] (6) Realize wave energy, offshore wind turbine, and distributed grid-forming energy storage to form a microgrid system;

[0053] (7) Realize wave energy generation to increase the capacity of the entire offshore wind farm.

Claims

1. A moisture-proof and dehumidification system for offshore wind turbines, characterized in that, It includes a wave energy generation device (1), a distributed grid-connected energy storage device (2), a dehumidification device (3), a multi-port DC-DC converter (4), and a wind turbine power supply port (5); The wave energy generation device (1) is electrically connected to the dehumidification device (3) of the wind turbine through the multi-port DC converter (4) and the dehumidification device (3); And / or the distributed grid-connected energy storage device (2) is electrically connected to the dehumidification device (3) of the wind turbine through the multi-port DC converter (4) and the dehumidification device (3); The power supply port (5) of the wind turbine is electrically connected to the dehumidification device (3) of the wind turbine via the multi-port DC converter (4) and the dehumidification device (3) to supply power to the dehumidification device (3) of the wind turbine.

2. The offshore wind turbine moisture-proof and dehumidification system according to claim 1, characterized in that, The wind turbine unit includes blades (6), gearbox (7), generator (8), turbine-side inverter (9), grid-side inverter (10), main circuit breaker (15), step-up transformer (11), and high-voltage switchgear (12). The input shafts of the blades (6) and gearbox (7) are connected by a drive, and the output shaft of the gearbox (7) is connected by a drive to the generator (8). The generator (8), turbine-side inverter (9), grid-side inverter (10), main circuit breaker (15), step-up transformer (11), and high-voltage switchgear (12) are electrically connected in sequence. The wires between the machine-side inverter (9) and the grid-side inverter (10) are electrically connected via a multi-port DC converter (4) and a dehumidification device (3) to supply power to the dehumidification device (3) of the wind turbine.

3. The offshore wind turbine moisture-proof and dehumidification system according to claim 2, characterized in that, The number of wind turbine units is greater than or equal to 2, and the high-voltage switchgear (12) of the wind turbine units is connected in sequence through high-voltage submarine cables.

4. The offshore wind turbine moisture-proof and dehumidification system according to claim 1, characterized in that, The wind turbine unit includes blades (6), a generator (8), a machine-side frequency converter (9), a grid-side frequency converter (10), a main circuit breaker (15), a step-up transformer (11), and a high-voltage switchgear (12). The blades (6) and the generator (8) are connected by a drive, and the generator (8), the machine-side frequency converter (9), the grid-side frequency converter (10), the main circuit breaker (15), the step-up transformer (11), and the high-voltage switchgear (12) are connected in sequence by an electrical connection. The generator (8) is a permanent magnet generator. The wires between the machine-side inverter (9) and the grid-side inverter (10) are electrically connected via a multi-port DC converter (4) and a dehumidification device (3) to supply power to the dehumidification device (3) of the wind turbine.

5. A moisture-proof and dehumidification system for offshore wind turbines according to claim 1, characterized in that, The wind turbine unit includes blades (6), gearbox (7), generator (8), turbine-side inverter (9), grid-side inverter (10), main circuit breaker (15), step-up transformer (11), and high-voltage switchgear (12). The input shafts of the blades (6) and gearbox (7) are connected by a drive, and the output shaft of the gearbox (7) is connected by a drive to the generator (8). The generator (8), turbine-side inverter (9), grid-side inverter (10), main circuit breaker (15), step-up transformer (11), and high-voltage switchgear (12) are electrically connected in sequence. The generator (8) is a dual feedback generator (8), and a contactor (13) is connected in series between the generator (8) and the main circuit breaker (15); The wires between the machine-side inverter (9) and the grid-side inverter (10) are electrically connected via a multi-port DC converter (4) and a dehumidification device (3) to supply power to the dehumidification device (3) of the wind turbine.

6. The offshore wind turbine moisture-proof and dehumidification system according to claim 1, characterized in that, The wind turbine's self-powered power (14) is electrically connected to the dehumidification device (3) to supply power to the dehumidification device (3).

7. A method for moisture prevention and dehumidification of offshore wind turbine units, characterized in that, The offshore wind turbine moisture-proof and dehumidification system according to any one of claims 1 to 6 includes the following: Mild dehumidification: Power is generated by wave energy generator (1), and the electrical energy is transferred to dehumidification device (3) through multi-port DC converter (4) for moisture prevention and dehumidification. Excess electrical energy is stored in distributed grid energy storage device (2) through multi-port DC converter (4). Deep dehumidification: The offshore wind turbine generates electricity and transmits the electrical energy to the dehumidification device (3) through a multi-port DC converter (4) for moisture prevention and dehumidification. Excess electrical energy is stored in a distributed grid energy storage device (2) through the multi-port DC converter (4).

8. A method for moisture prevention and dehumidification of offshore wind turbine units according to claim 7, characterized in that, It also includes the following: the wave energy power generation device (1) generates electricity, and through the multi-port DC converter (4), the electrical energy is stored in the distributed grid energy storage device (2). The distributed grid energy storage device (2) charges the DC bus of the offshore wind turbine converter through the multi-port DC converter (4) to raise the voltage to the rated value; the offshore wind turbine grid-side converter (10) is unlocked, and the grid control strategy is adopted to output the preset frequency and voltage. When the external wind speed meets the start-up conditions, the offshore wind turbine is started to achieve self-starting and the wind energy is converted into electrical energy.

9. A method for moisture prevention and dehumidification of offshore wind turbine units according to claim 8, characterized in that, It also includes the following: The first wind turbine provides AC or DC power to the adjacent wind turbines. The next turbine is started by closing the main circuit breaker (15), and the process is gradually extended to the wind turbines of the entire circuit, so that other wind turbines can be started one by one. When the wind turbines are started, the distributed grid-connected energy storage device (2) is not used. The high voltage switch cabinet (12) on this circuit is closed to form a circuit, and the wind turbines are started in sequence. After all the wind turbines are started, the active power is gradually increased to control the offshore wind power generation power to meet the functions of moisture prevention and dehumidification, lighting and other self-use electricity. The excess electricity is converted into energy storage in the distributed grid-connected energy storage device (2). After the energy storage is completed, the wind turbines should not over-generate electricity.

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