CN110118155A - A kind of the marine power generation platform and electricity-generating method of stormy waves complementation - Google Patents

Abstract

The invention discloses a wind and wave complementary offshore power generation platform, which includes a floating platform, a hydroelectric generator, a wind power generator, a water pump and a controller; the floating platform is used to provide a floating foundation and collect seawater for the hydroelectric generator to generate electricity ;Hydraulic generators are used to drain water and convert the stored seawater potential energy into electrical energy and transmit it to the controller; wind turbines are used to convert offshore wind energy into electrical energy and transmit it to the controller; The seawater is pumped into the floating platform, so that the excess electric energy is converted into seawater potential energy and stored; the controller is used to store and transmit the converted electric energy of the hydroelectric generator and wind power generator, and is used for pumps, hydroelectric generators and wind power generators. The generator supplies power, receives the status signals of the water pump, the hydro generator and the wind power generator, controls the start and stop signals of the water pump, the water turbine generator and the wind power generator, and is used to adjust the power generation. Improve energy utilization rate and high power generation efficiency.

Description

A wind and wave complementary offshore power generation platform and power generation method

technical field

The invention relates to the technical field of new energy power generation, in particular to an offshore power generation platform and a power generation method with complementary wind and waves.

Background technique

With the continuous consumption of fossil energy and increasingly severe environmental pollution, the development and utilization of renewable energy has attracted more and more attention. Both wind energy and wave energy are types of renewable energy. They are environmentally friendly, have large and inexhaustible energy reserves, and have particularly great potential for development. Onshore wind power generation is now mature and commercialized on a large scale. Due to the effective land area and abundant wind energy resources at sea, more and more attention is shifted to the development of offshore wind power. Wave energy power generation is currently still in the research stage, but it is also one of the key points of research in the field of new energy. Among them, the over-wave wave energy device has the advantages of high reliability and is not easily damaged by extreme sea conditions.

Wind energy has large fluctuations with time and seasons, which affects the power generation of power generation devices and resource utilization. When the wind condition is too large, due to problems such as limited load acceptance capacity, it will cause "abandoned wind" to waste energy; when When the wind condition is too low, the generated power is not enough to meet the load requirements.

Combining offshore wind power generation with over-the-wave wave power generation can solve the above problems. When the power generation is higher than the upper limit, the wave energy power generation can be reduced or turned off, and the seawater can be pumped into the storage tank of the surfing device with a water pump, and the excess electricity can be converted into the potential energy of seawater for storage. Only when the storage tank is full At this time, it is considered to use means such as variable pitch to reduce the power generation of wind turbines and give up excess wind energy; when the power generation is lower than the lower limit, wave power generation can be increased, and the previously stored seawater potential energy can be converted into electric energy to ensure power generation requirements. In addition, the stored seawater also increases the stability of the platform, which is beneficial for wind turbines to adapt to strong wind conditions.

In addition, the water storage tank in the wave-surpassing wave power generation device has a large space and interacts with the external seawater, so it is a suitable seawater farming occasion. In the past, mariculture was mostly not far from the coast, and the space available for aquaculture was limited. With the help of floating power generation platforms, mariculture can be extended to the far sea when the offshore space is insufficient, and the required power can be generated by wind power and wave energy. Power Generation Guarantee. Offshore wind power, wave power generation, and mariculture share a floating foundation, which can greatly reduce equipment costs and improve power generation and area utilization.

Contents of the invention

In order to overcome the deficiencies of the above technologies, the present invention provides a wind and wave complementary offshore power generation platform, which can improve energy utilization, save equipment costs, and have high power generation efficiency and stable energy output.

The present invention also provides a power generation method using the wind and wave complementary offshore power generation platform.

The technical scheme that the present invention overcomes its technical problem adopts is:

A wind and wave complementary offshore power generation platform, including a floating platform, a hydroelectric generator, a wind generator, a water pump and a controller; wherein,

The floating platform is used to provide a floating foundation and collect seawater for hydroelectric power generation;

The hydroelectric generator is arranged in the floating platform, and is used for draining water and converting the seawater potential energy accumulated in the floating platform into electric energy and transmitting it to the controller;

The wind generator is set on the floating platform, and is used to convert offshore wind energy into electrical energy and transmit it to the controller;

The water pump is arranged on the floating platform, and is used to pump seawater into the floating platform when the power generation is excessive, so that the excess electric energy is converted into seawater potential energy and stored;

The controller is set in the tower of the wind power generator, and is used to store and transmit the converted electric energy of the water turbine generator and the wind power generator, supply power for the water pump, the water turbine generator and the wind power generator, and receive pumping power. The status signals of water pumps, hydro-generators and wind power generators are used to control the start and stop signals of water pumps, hydro-generators and wind power generators, and to regulate power generation.

Further, the floating platform is provided with a reservoir, and at the bottom of the reservoir is provided with at least one drainage hole, each drainage hole is controlled to open and close by a controller, and each drainage hole is provided with a hydroelectric generator, The inner wall of the reservoir is provided with a first-level liquid level sensor and a second-level liquid level sensor arranged in sequence from bottom to top. The center of the reservoir is provided with a hollow boss, and the wind generator is fixed on the boss. Above; the controller is also used to supply power to the primary liquid level sensor and the secondary liquid level sensor, receive liquid level signals collected by the primary liquid level sensor and the secondary liquid level sensor, and control the opening and closing of the drainage hole.

Further, the bottom of the boss is provided with at least one opening that communicates with the water reservoir, and the space between the boss and the water reservoir can be fully utilized to increase the amount of water stored.

Further, the floating platform is in the shape of a ring, and its outer circumference is a rising slope, and several wave gathering boards are evenly distributed around the slope.

Further, the bottom of the floating platform is provided with a balance board, and mooring lines are tied on the balance board, and the balance board can rely on the buoyancy and gravity of seawater to balance the overturning moment brought by the wind generator.

Further, the floating platform is also used to provide a seawater culture base, the floating platform is provided with an automatic feeder for regularly feeding the fish cultured in the floating platform, and the controller is also used for powering the automatic feeder and Control the start and stop signal of the automatic feeder.

Further, an isolation net is provided above each drainage hole, and the isolation net is used to prevent cultured fish from entering the drainage hole and flowing into the sea.

Further, the controller includes a central processing unit, a counting unit, a comparison unit, a timing unit and an energy storage unit, the input of the counting unit is connected to the output of the central processing unit, and the output is connected to an input of the comparison unit connection, among the other two input terminals of the comparison unit, one input terminal is connected to the output terminal of the energy storage unit, one input terminal is connected to the output terminal of the central processing unit, and the output terminal of the comparison unit is connected to the input terminal of the central processing unit. The output end of the timing unit is connected to the input end of the central processing unit, the energy storage unit is connected to the output end of the central processing unit, and the central processing unit, the counting unit, the comparison unit and the timing unit are all connected to the output end of the energy storage unit.

The present invention also provides a power generation method using the aforementioned wind and wave complementary offshore power generation platform, including:

When the total power generation continues to exceed the upper limit, the number of drain holes is closed one by one to reduce the number of works of the hydroelectric generator. When the wind energy is still too high after all the drain holes are closed, the water pump is turned on to draw seawater with excess power generation. It is converted into seawater potential energy storage in the reservoir; when the water level in the reservoir reaches the upper limit of the water level monitored by the first-level liquid level sensor, the water pump is turned off and the wind turbine is controlled to reduce energy capture;

When the total power generation is constantly lower than the lower limit, open the number of drainage holes one by one to increase the number of jobs of the hydroelectric generator;

When the water level in the reservoir reaches the upper limit of the water level monitored by the secondary liquid level sensor, control the wind generator to shut down and open all the drainage holes to increase the working number of the hydroelectric generator to drain water.

Further, the above power generation method specifically includes the following steps:

S1, the controller controls to turn on the wind power generator and all the water turbine generators to start working, the total number of water turbine generators is set to n, and the counter i=1;

S2. Judging the water level in the reservoir: if the water level is higher than the upper limit of the water level monitored by the secondary liquid level sensor, turn off the wind turbine and turn on all the water turbine generators at the same time to make the seawater flow back to the sea from the drain hole to reduce the water level, i=1 ; If the water level is lower than the upper limit of the water level monitored by the secondary liquid level sensor, proceed to the next step;

S3. Continue to judge the water level in the reservoir: if the water level is higher than the upper limit of the water level monitored by the first-level liquid level sensor, then turn off the pump; if the water level is lower than the upper limit of the water level monitored by the first-level liquid level sensor, proceed to the next step;

S4. Judging the working state of the wind generator: if the wind generator is in the working state, proceed to the next step directly; if the wind generator is not in the working state, turn on the wind generator and proceed to the next step;

S5. Judging the power generation: if the power generation is within a reasonable range, then maintain the current power supply; if the power generation is higher than the upper limit, then judge whether all the hydro-generators are closed, if i≤n, then turn off the i-th water turbine and use i =i+1, if i>n, turn on the water pump; if the power generation is lower than the lower limit, first check the working status of the water pump, if it works, turn off the water pump, if not, then judge whether the turbine generator is All are turned on, if i>1, then i=i-1 and turn on the i-th hydroelectric generator.

The beneficial effects of the present invention are:

1. The present invention combines offshore wind power generation and over-the-wave wave power generation to realize the complementarity between the two, can adapt to the characteristics of large changes in time and seasons of wind energy and wave energy, and effectively solves the problem of single wind power generation in strong winds. In the case of "abandoning wind" to waste energy and insufficient output under small wind conditions, the energy utilization rate is improved and the output is more stable. When the power of wind power generation is excessive, the power of wave energy generation can be reduced or turned off, and the excess electric energy can be converted into seawater potential energy for storage; when the power of wind power generation is insufficient, the power of wave energy generation can be increased, and the stored seawater potential energy can be converted into electrical energy.

2. In the present invention, wind energy, wave energy and mariculture can also share a set of floating platform and power supply system, which does not need to be arranged near the coast, reduces equipment costs, improves area utilization, and has a simple structure and high reliability.

Description of drawings

Fig. 1 is a schematic side view structural diagram of the offshore power generation platform described in Embodiment 1 of the present invention.

Fig. 2 is a schematic perspective view of the three-dimensional structure of the offshore power generation platform described in Embodiment 1 of the present invention.

FIG. 3 is a schematic diagram of the principle of the controller described in Embodiment 1 of the present invention.

Fig. 4 is a schematic flow chart of power generation according to Embodiment 2 of the present invention.

In the figure, 1-floating platform, 1.1-wave gathering plate, 1.2-reservoir, 1.3-drainage hole, 1.4-isolation net, 1.5-first-level liquid level sensor, 1.6-secondary liquid level sensor, 1.7-boss, 1.8-balance plate, 1.9-mooring line, 1.10-opening, 2-hydro generator, 3-wind generator, 4-pump, 5-controller, 5.1-central processing unit, 5.2-counting unit, 5.3 -comparison unit, 5.4-timing unit, 5.5-energy storage unit, 6-automatic feeder; n-hydraulic generator/the total number of drainage holes.

Detailed ways

In order to facilitate those skilled in the art to better understand the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The following is only exemplary and does not limit the protection scope of the present invention.

Embodiment 1,

As shown in FIG. 1 , a wind and wave complementary offshore power generation platform described in this embodiment includes a floating platform 1 , a water turbine generator 2 , a wind power generator 3 , a water pump 4 and a controller 5 . in,

The floating platform 1 is used to provide a floating foundation and collect seawater for the hydroelectric generator 2 to generate electricity.

The hydroelectric generator 2 is arranged in the floating platform 1 and is used for draining water and converting the potential energy of seawater accumulated in the floating platform 1 into electrical energy and transmitting it to the controller 5 .

The wind generator 3 is installed on the floating platform 1, and is used to convert offshore wind energy into electrical energy and transmit it to the controller 5. The wind generator 2 can also be called a wind generator, a wind turbine, or a fan.

The water pump 4 is arranged on the floating platform 1, and is used for pumping seawater into the floating platform 1 when the generating capacity is excessive, so that the excess electric energy is converted into seawater potential energy and stored.

The controller 5 is arranged in the tower of the wind generator 3, and the controller 5 is arranged in the tower of the wind generator 3 to prevent the intrusion of rainwater. The electric energy converted by the generator 3 is stored and transmitted to the external power grid to supply power for the water pump 4, the hydro-generator 2 and the wind power generator 3, and receive the status signals of the water pump 4, the hydro-generator 2 and the wind power generator 3 , to control the start and stop signals of the water pump 4, the water turbine generator 2 and the wind power generator 3, and to adjust the generated power.

Specifically, as shown in Figure 2, in this embodiment, a water reservoir 1.2 is provided inside the floating platform 1, and the water reservoir 1.2 is used to accumulate seawater potential energy to work for the hydroelectric generator 2; the floating platform 1 is a circular ring, and the outer circumference of the floating platform 1 is a rising slope. The angle of the slope is preferably 30°-40°. Several wave gathering plates 1.1 are evenly distributed on the slope to divide the circular slope into Several shrinking ramps, the circular floating platform can absorb incident waves from waves in all directions, and make full use of the waves. The wave gathering plate 1.1 is similar to an inverted trapezoidal structure, and the shrinking ramps divided by the wave gathering plate 1.1 can Collect the waves enough to cross the slope and enter the reservoir 1.2. Further, the water pump 4 is installed on one of the wave gathering boards 1.1. One end of the water pipe goes deep into the sea and the other goes deep into the reservoir 1.2; the reservoir 1.2 The bottom is provided with at least one drainage hole 1.3, and each drainage hole 1.3 is controlled by the controller 5 to open and close, and each drainage hole 1.3 is provided with a hydroelectric generator 2, and the opening or closing of the hydroelectric generator 2 is related to the drainage hole The opening or closing of 1.3 is corresponding, that is, the opening or closing of the hydroelectric generator 2 is realized by the opening or closing of the drainage hole 1.3; the inner wall of the reservoir 1.2 is provided with a first-level liquid level that is arranged sequentially from bottom to top The sensor 1.5 and the secondary liquid level sensor 1.6, the output ends of the primary liquid level sensor 1.5 and the secondary liquid level sensor 1.6 are respectively connected to the input end of the controller 5; the center of the reservoir 1.2 is provided with an internal hollow Boss 1.7, preferably said boss 1.7 is circular frustum shape, high in stability, and described wind-driven generator 3 is fixed on the boss 1.7, and the purpose of setting like this is to make wind-powered generator 3 not contact seawater, reduce sealing anti-corrosion It is required and convenient for staff to repair and maintain; further, the bottom of the boss 1.7 is provided with at least one opening 1.10 communicating with the reservoir 1.2. After the boss 1.7 communicates with the reservoir 1.2, the space can be fully utilized to increase water storage. water volume. Correspondingly, the controller 5 is also used to supply power to the primary liquid level sensor 1.5 and the secondary liquid level sensor 1.6, receive liquid level signals collected by the primary liquid level sensor 1.5 and the secondary liquid level sensor 1.6, and control drainage The opening and closing of hole 1.3.

Further, the bottom of the floating platform 1 is provided with a balance plate 1.8, and the radius of the balance plate 1.8 is greater than the radius of the bottom surface of the floating platform. The balance plate 1.8 can rely on the buoyancy and gravity of seawater to balance the overturning moment brought by the wind turbine, so that The entire floating platform 1 remains stable; furthermore, a mooring line 1.9 is tied on the balance board 1.8.

The wind and wave complementary offshore power generation platform described in this embodiment can also be used for mariculture, thus combining offshore wind energy, over-wave wave energy and mariculture. That is, the floating platform 1 is also used to provide a mariculture base, specifically, the reservoir 1.2 provides a mariculture base, and the floating platform 1 is provided with an automatic feeder for regularly feeding the fish cultured in the floating platform 1. Eater 6, further, the automatic feeder 6 is provided with several and evenly distributed around the edge of the boss 1.7; correspondingly, the controller 5 is also used to power the automatic feeder 6 and control the automatic Feeder 6 start-stop signal. In addition, an isolation net 1.4 is provided above each drainage hole 1.3 to prevent cultured fish from entering the drainage hole 1.3 and thus flowing into the sea. It should be noted that the lowest water level in the reservoir 1.2 should be lower than the sea level, and the highest water level in the reservoir 1.2, that is, the installation position of the secondary liquid level sensor 1.6 is higher than the sea level and lower than the highest part of the periphery of the reservoir 1.2 distance to prevent fish from jumping out.

In this embodiment, as shown in FIG. 3 , the controller 5 includes a central processing unit 5.1, a counting unit 5.2, a comparison unit 5.3, a timing unit 5.4, and an energy storage unit 5.5; wherein, the input terminal of the counting unit 5.2 is connected to the The output terminal of the central processing unit 5.1 is connected, and the output terminal is connected with an input terminal of the comparison unit 5.3, and the counting unit 5.2 is used to count the number of working numbers of the hydraulic generator 2; among the other two input terminals of the comparison unit 5.3 , wherein one input terminal is connected to the output terminal of the energy storage unit 5.5, one input terminal is connected to the output terminal of the central processing unit 5.1, the output terminal of the comparison unit 5.3 is connected to the input terminal of the central processing unit 5.1, and the comparison unit 5.3 uses It is used to compare the real-time power signal of the energy storage unit 5.5, compare the working number of the hydraulic generator 2, and compare the liquid level signal collected by the primary liquid level sensor 1.5 and the secondary liquid level sensor 1.6 with the set liquid level signal. The upper limit value is compared with the lower limit value; the output end of the timing unit 5.4 is connected with the input end of the central processing unit 5.1, and the timing unit 5.4 is used to send the feeding signal of the automatic feeder 6 to the central processing unit 5.1; The energy storage unit 5.5 is connected to the output terminal of the central processing unit 5.1, and is used to transmit the electric energy stored in the energy storage unit 5.5 to an external power grid through the central processing unit 5.1; the central processing unit 5.1, the counting unit 5.2, and the comparison unit 5.3 Both the timing unit 5.4 and the energy storage unit 5.5 are connected to the output end of the energy storage unit 5.5 so that the energy storage unit 5.5 supplies power to the central processing unit 5.1, the counting unit 5.2, the comparison unit 5.3 and the timing unit 5.4.

Embodiment 2,

A power generation method using the wind and wave complementary offshore power generation platform described in Embodiment 1, comprising:

When the water level in the reservoir 1.2 is lower than the upper limit of the water level monitored by the first-level liquid level sensor 1.5, the controller 5 controls the number of the hydraulic generators 2 to meet the power generation requirements; when the power generation exceeds the upper limit, the control Device 5 controls the number of drain holes 1.3 to be closed one by one to reduce the working number of water turbine generator 2. When the drain holes 1.3 are all closed and the wind energy is still too high, the water pump 4 is turned on to pump seawater to the storage tank with excess power generation. The water tank 1.2 is converted into seawater potential energy storage. When the water level in the water tank 1.2 reaches the upper limit of the water level monitored by the first-level liquid level sensor 1.5, the water pump is turned off and the wind power generator 3 is controlled to reduce energy capture by means such as pitch change; When the power generation is continuously lower than the lower limit, the controller 5 controls the number of drain holes 1.3 to be opened one by one to increase the number of jobs of the hydroelectric generator 2 . This solution can adapt to the characteristics of large changes in time and seasons of wind energy and wave energy, and can effectively solve the problems of a single wind turbine 3 "abandoning wind" in high wind conditions to waste energy and insufficient output in low wind conditions. Improve energy utilization and make the output more smooth. When the power of wind power generation is excessive, the power of wave energy generation can be reduced or turned off, and the excess electric energy can be converted into seawater potential energy for storage; when the power of wind power generation is insufficient, the power of wave energy generation can be increased, and the stored seawater potential energy can be converted into electrical energy. In addition, the seawater pumped by the water pump 4 can further increase the stability of the floating platform 1, so that the offshore power generation platform can work more reliably under strong wind conditions.

When the water level of the reservoir 1.2 reaches the upper limit of the water level monitored by the secondary liquid level sensor 1.6 in weather such as heavy rain or rainstorm, the wind power generator 3 is controlled to be closed and all drain holes 1.3 are opened to increase the working number of the hydroelectric generator 2 Let it drain. The advantage of this situation is that, after shutting off the hydroelectric generator 2, and in the process of storing water by the water pump 4, when encountering weather such as heavy rain or rainstorm, it can prevent the water level in the reservoir 1.2 from being too high to make the cultivated Fish jumped out of the reservoir into the sea.

The above power generation method more specifically includes the following steps, as shown in Figure 4:

S1, the controller 5 controls to open the wind power generator 3 and all the water turbine generators 2 to start working, if the total number of the water turbine generators 2 is n, the counter i=1;

S2, judging the water level in the reservoir 1.2: if the water level is higher than the upper limit of the water level monitored by the secondary liquid level sensor 1.6, then turn off the wind power generator 3 and turn on all the water turbine generators 2 at the same time to make the seawater flow back to the sea from the drain hole 1.3 Lower the water level, i=1; if the water level is lower than the upper limit of the water level monitored by the secondary level sensor 1.6, proceed to the next step;

S3, continue to judge the water level in the reservoir 1.2: if the water level is higher than the upper limit of the water level monitored by the primary liquid level sensor 1.5, then close the pump 4; if the water level is lower than the upper limit of the water level monitored by the primary liquid level sensor 1.5, then proceed Next step;

S4. Judging the working state of the wind-driven generator 3: if the wind-driven generator 3 is in the working state, proceed to the next step directly; if the wind-driven generator 3 is not in the working state, then turn on the wind-driven generator 3 and proceed to the next step;

S5. Judging the power generation: if the power generation is within a reasonable range, then maintain the current power supply; if the power generation is higher than the upper limit, then judge whether all the hydro-generators 2 are closed, if i≤n, then turn off the i-th water turbine and use i=i+1, if i>n, turn on the water pump 4; if the power generation is lower than the lower limit, first check the working status of the water pump 4, if it works, turn off the water pump 4, if it does not work, judge the water pump 4 Whether all the turbine generators 2 are turned on, if i>1, then i=i-1 and the i-th turbine generator 2 is turned on.

The above only describes the basic principle and preferred implementation of the present invention, and those skilled in the art can make many changes and improvements according to the above description, and these changes and improvements should belong to the protection scope of the present invention.

Claims (10)

1. A wind and wave complementary offshore power generation platform is characterized by comprising a floating platform (1), a hydraulic generator (2), a wind driven generator (3), a water pump (4) and a controller (5); wherein,

the floating platform (1) is used for providing a floating foundation and accumulating seawater for the hydraulic generator (2) to generate electricity;

the hydraulic generator (2) is arranged in the floating platform (1) and is used for draining water, converting the seawater potential energy accumulated in the floating platform (1) into electric energy and transmitting the electric energy to the controller (5);

the wind driven generator (3) is arranged on the floating platform (1) and is used for converting offshore wind energy into electric energy and transmitting the electric energy to the controller (5);

the water suction pump (4) is arranged on the floating platform (1) and is used for pumping seawater into the floating platform (1) when the generated energy is excessive, so that the excessive electric energy is converted into seawater potential energy to be stored;

the controller (5) is arranged in a tower of the wind driven generator (3) and used for storing and transmitting electric energy converted by the water wheel generator (2) and the wind driven generator (3), supplying power to the water suction pump (4), the water wheel generator (2) and the wind driven generator (3), receiving state signals of the water suction pump (4), the water wheel generator (2) and the wind driven generator (3), controlling start and stop signals of the water suction pump (4), the water wheel generator (2) and the wind driven generator (3) and adjusting power generation.

2. The wind and wave complementary offshore power generation platform according to claim 1, wherein a reservoir (1.2) is arranged in the floating platform (1), at least 1 drain hole (1.3) is formed in the bottom of the reservoir (1.2), each drain hole (1.3) is controlled to be opened and closed through a controller (5), a hydraulic generator (2) is arranged in each drain hole (1.3), a primary liquid level sensor (1.5) and a secondary liquid level sensor (1.6) are sequentially arranged on the inner wall of the reservoir (1.2) from bottom to top, a boss (1.7) with a hollow inner part is arranged in the center of the reservoir (1.2), and the wind power generator (3) is fixed on the boss (1.7); the controller (5) is also used for supplying power to the primary liquid level sensor (1.5) and the secondary liquid level sensor (1.6), receiving liquid level signals collected by the primary liquid level sensor (1.5) and the secondary liquid level sensor (1.6) and controlling the opening and closing of the drain hole (1.3).

3. The wind-wave complementary offshore power generation platform according to claim 2, characterized in that the bottom of the boss (1.7) is provided with at least one opening (1.10) communicating with a reservoir (1.2).

4. The wind and wave complementary offshore power generation platform of claim 2, wherein the floating platform (1) is circular, the outer circumference of the floating platform is a rising slope, and a plurality of wave gathering plates (1.1) are uniformly distributed and surrounded on the slope.

5. The wind-wave complementary offshore power generation platform of claim 2, wherein the bottom of the floating platform (1) is provided with a balance plate (1.8), and the balance plate (1.8) is tied with a mooring line (1.9).

6. The wind-wave complementary offshore power generation platform according to any one of claims 2 to 5, wherein the floating platform (1) is further configured to provide a mariculture base, the floating platform (1) is provided with an automatic feeder (6) for feeding fishes cultured in the floating platform (1) at regular time, and the controller (5) is further configured to supply power to the automatic feeder (6) and control a start-stop signal of the automatic feeder (6).

7. The wind-wave complementary offshore power generation platform according to claim 6, wherein an isolation net (1.4) is arranged above each drainage hole (1.3).

8. The wind-wave complementary offshore power generation platform according to claim 7, wherein the controller (5) comprises a central processing unit (5.1), a counting unit (5.2), a comparing unit (5.3), a timing unit (5.4) and an energy storage unit (5.5), wherein the counting unit (5.2) has an input connected to the output of the central processing unit (5.1) and an output connected to one input of the comparing unit (5.3), wherein of the other two inputs of the comparing unit (5.3), one input is connected to the output of the energy storage unit (5.5) and one input is connected to the output of the central processing unit (5.1), wherein the output of the comparing unit (5.3) is connected to the input of the central processing unit (5.1), wherein the output of the timing unit (5.4) is connected to the input of the central processing unit (5.1), and wherein the energy storage unit (5.5) is connected to the output of the central processing unit (5.1), and the central processing unit (5.1), the counting unit (5.2), the comparing unit (5.3) and the timing unit (5.4) are all connected with the output end of the energy storage unit (5.5).

9. A method of generating electricity using the wind and wave complementary offshore power generation platform of any one of claims 2 to 8, comprising:

when the total generated energy continuously exceeds the upper limit, the number of the drain holes (1.3) is closed one by one to reduce the working number of the hydraulic generator (2), and when the wind energy is still too high after the drain holes (1.3) are completely closed, the water suction pump (4) is started to pump seawater into the reservoir (1.2) by using the redundant generated energy and convert the seawater into seawater potential energy for storage; when the water level in the reservoir (1.2) reaches the upper limit of the water level monitored by the first-level liquid level sensor (1.5), the water pump is closed and the wind driven generator (3) is controlled to reduce the energy capture;

when the total generating capacity is continuously lower than the lower limit, the number of the drain holes (1.3) is gradually started to increase the working number of the hydraulic generator (2);

when the water level in the reservoir (1.2) reaches the upper water level limit monitored by the secondary liquid level sensor (1.6), the wind driven generator (3) is controlled to be closed and all the water discharging holes (1.3) are opened so as to increase the working number of the hydraulic generator (2) to discharge water.

10. The power generation method according to claim 9, characterized by comprising in particular the steps of:

s1, the controller (5) controls the wind driven generator (3) and all the hydraulic generators (2) to start working, the total number of the hydraulic generators (2) is set to be n, and the counter i = 1;

s2, judging the water level in the reservoir (1.2): if the water level is higher than the upper limit of the water level monitored by the secondary liquid level sensor (1.6), the wind driven generator (3) is turned off, and all the hydraulic generators (2) are turned on simultaneously, so that the seawater flows back to the sea from the drain hole (1.3) to reduce the water level, i = 1; if the water level is lower than the upper limit of the water level monitored by the secondary liquid level sensor (1.6), the next step is carried out;

s3, continuously judging the water level in the reservoir (1.2): if the water level is higher than the upper limit of the water level monitored by the first-level liquid level sensor (1.5), the water suction pump (4) is closed; if the water level is lower than the upper limit of the water level monitored by the first-level liquid level sensor (1.5), the next step is carried out;

s4, judging the working state of the wind driven generator (3): if the wind driven generator (3) is in a working state, directly carrying out the next step; if the wind driven generator (3) is in an out-of-operation state, the next step is carried out after the wind driven generator (3) is started;

s5, judging the power generation amount: if the generated energy is in a reasonable interval, maintaining the current situation for power supply; if the power generation amount is higher than the upper limit, judging whether all the hydraulic generators (2) are closed, if i is less than or equal to n, closing the ith hydraulic turbine and enabling i = i +1, and if i is more than n, starting the water suction pump (4); if the generated energy is lower than the lower limit, the working state of the water suction pump (4) is checked, if the generated energy is lower than the lower limit, the water suction pump (4) is closed, if the generated energy is not working, whether all the hydraulic generators (2) are started is judged, if i is larger than 1, i = i-1, and the ith hydraulic generator (2) is started.