WO2010126229A2

WO2010126229A2 - Small-scale, large-capacity, seawater-flow power generator for high-speed seawater flows

Info

Publication number: WO2010126229A2
Application number: PCT/KR2010/002005
Authority: WO
Inventors: 장경수; 이정은; 장성원; 장재원
Original assignee: Jang Kyung Soo; Lee Jung Eun; Jang Seung Won; Jang Jae Won
Priority date: 2009-04-27
Filing date: 2010-04-01
Publication date: 2010-11-04
Also published as: KR20100117875A; KR101075071B1; WO2010126229A3

Abstract

The present invention relates to a seawater-flow power generator for obtaining electrical energy by causing the blades of a water turbine to rotate using seawater flowing at high speed through man-made sea-based structures such as lock gate or sluice gate structures in sea walls or sea-based power generation systems such as a tidal power generation systems, and provides a small-scale, large-capacity, seawater-flow power generator for high-speed seawater flows which is suitable for seawater flowing at very much faster speeds than the speeds of tidal currents created by the natural phenomenon of ebb and flow alone.

Description

Small Sized Large Current Current Generator for High Speed Current

The present invention relates to an algae generator for converting the kinetic energy of the algae generated by tidal tides, which are rapidly flowing rivers or natural phenomena, into electrical energy.

Hereinafter, tidal power generation system, marine power generation system, or drainage locks or gates of tidal power generation system constructed together with tidal power crossing the sea, separated from tidal current, which is a natural phenomenon generated in the ocean by tidal tides, and tidal power generation using it. The rapid flow of seawater generated from artificial marine structures such as structures is called the current, and the development using this is called current generation.

More specifically, the inventors of the present invention devised an integrated power generation system (registered patent 10-0867547, PCT / KR2008 / 001388), which combines tidal power generation and ocean current generation, and combined marine power generation combined with hydrological and current generation. Related to the system (Patent 10-0883756, PCT / KR2008 / 002414), the speed of algae due to natural phenomena of tidal tides through artificially constructed marine structures, such as marine power generation systems, drainage locks of seawalls, or hydrologic structures. The present invention relates to a small-capacity current generator for high-speed current that can obtain electrical energy from the kinetic energy of the current flowing at a much higher speed.

The tidal current system consists of a water turbine, a gearbox, a generator, a power converter, and a supporting structure. Algae power generates electricity by rotating a water wheel turbine driven by kinetic energy of a fluid, such as wind power, and converting a low speed of the axle shaft connected to a water turbine to a high speed gearbox through a gearbox. The generated electrical energy is transmitted to substations on nearby beaches through submarine cables.

The basic laws of physics applied to algae power generation, which extract energy from algae, are the same as in wind power generation. Lifting devices similar to wind turbine horizontal propeller-type turbine blades are found to be the most cost-effective and most efficient.

In general, tidal power generated by tidal current generators installed on tidal currents generated by tidal tides can be calculated from the following equation (1).

Therefore, the high tidal flow rate is absolutely advantageous for tidal power generation because the power output Pw that can be obtained from tidal current is proportional to the density ρ of the seawater, the efficiency η of the tidal current generator and the seawater passage cross-section A, and is proportional to 3 squared of the tidal current V.

Algae generators are classified into helical, HAT (horizontal axis turbine), and VAT (vertical axis turbine) types according to the type of water turbine. At home and abroad, MW-class commercial algae generators have not been released yet, but the technology of the wind power field accumulated for decades can be easily combined, so the flow rate of algae is good and construction cost is low. Efforts are being made. Overseas, technology development for the commercialization of algae generators is actively underway in Europe, Canada and the United States, mainly in the United Kingdom, Norway and Denmark.

As part of the Seaflow project in 2003, UK Marine Current Turbines installed a 0.3 MW test algae generator with a 11 m wingspan at Foreland Point in Lymouth Denver. The 1.2MW horizontal shaft propeller type tidal generator, consisting of two 0.6MW water turbine turbines with 16m wingspan, is being tested in Strongford Lough, Northern Ireland. At one point, the trouble caused the trouble of replacing the water turbine, but on December 18, 2008, it recorded 1.201.8 MW at 2.5m / s flow rate.

In Norway, Hammerfest Strom in 2003 developed the world's first 100 kW horizontal propeller type aberration generator and conducted field experiments. The company succeeded in connecting the generated power to the grid system. Kvalsundet also completed 300kW and 700kW algae generators in 2003 and 2006, and plans to build a 13.3MW algae complex in the near future.

With government support, Canada has steadily carried out research on algae development and is already entering the commercialization stage. Blue Energy Canada and Canoe Pass are two of the leading companies. In particular, Blue Energy Canada has developed its own vertical turbine type Davis turbine, exporting technology to the Philippines, Mexico and other facilities.

Although the United States is not doing much research on algae generation compared to Europe or Canada, Tidal Electric has developed its own technology and recently plans to install algae generators in Tijuana, Mexico. Verdant Power installed a small 25kW horizontal propeller type tidal generator next to Roosevelt Island in Manhattan, New York, USA in December 2006.In May 2007, Verdant Power installed five 5m water turbine turbines and 35kW generating capacity. It produces and supplies power from six horizontal propeller type algae generators with a total capacity of 0.2 MW.

Meanwhile, Korea has selected Uldolmok in Jindo, Jeollanam-do as the best site for construction of algae power plant in Korea and collected basic data since 2000. Also, since 2006, we have been conducting research on developing tidal current energy commercialization technology and commercialization base.We have 1.0MW (0.5MW 2 units) consisting of two helical aberrations connected in series of three vertical shaft turbines with a diameter of 3,000 height and 3,600 in series. ) A tidal current generator was developed, and it is being installed in wool dolls. On the other hand, the development of small scale horizontal propeller type 100kW floating-type algae power generation system with small and medium-sized enterprises supported by overseas technology is also in progress.

[Problems with Conventional Technology]

Most tidal current generators have a column of circular cross-section fixed to the seabed, and the generator is installed and fixed on it to generate power by using the flow of tidal current. Therefore, algae generators submerged in the sea apply the same theoretical principles as wind turbines and are lined up or installed in the form of wind farms.

The biggest difference between wind and tidal power is that the aberration turbine for tidal current generation is much smaller for the same rated power, and can be arranged much closer if the complex consists of multiple tidal generators. This is because the density of seawater is about 840 times greater than the density of air.

Algae change in the form of a sinusoidal cycle of tide and ebb tide two times a day, about 12 hours and 24 minutes, usually flowing 180 degrees in the opposite direction. That is, the flow of algae is changed four times a day, and the algae velocity is uneven and the flow direction is affected by the surrounding area of the installation area and the seabed topography. It is difficult.

Also, algae strength generally does not necessarily require a large tidal range or height, but is directly related to the tidal height in the area. However, in comparison to tidal power generation, large-scale power generation is not realized because of the great potential of algae resources, but the speed of algae, or energy density, is too small for economic development in most seas. In other words, the sea area where rapid seawater flows are limited worldwide, and the power generation efficiency of the available algae generator is insufficient to secure economic feasibility.

Algae power generation is possible even in places where the flow rate is around 1.0m / s, but for economical power generation, the area where the average speed of algae is 2.0m / s or more is considered as a promising region. Depending on the speed, it can be designed to produce power output of up to 750kW to 1,000kW per unit of water turbine.

However, when looking at the current state of the development of the algae generator, as mentioned above, the water turbine of 16m wing diameter developed by Marine Current Turbines of UK in Seagen project is very large capacity of 600kW per unit. For example, aberration turbines with a power generation capacity of 750 to 1,000 kW per unit are quite large. In addition, the wing diameter of the aberration turbine, which has a larger power generation capacity, should not only be more than 20 m, but also the depth of the seabed to install such a tidal generator should be deeper, and the cost of construction will increase along with the difficulty of installation.

To be more specific, according to Betz's law, even if the coefficient 16/27 of the theoretical maximum output value obtained from the tidal current and the mechanical efficiency of the tidal generator water turbine are about 0.7, the tidal velocity is 2.0m / At s, in order to generate 750kW of unit aberration turbine, the wing diameter of the aberration turbine should be more than 24m, and the diameter of the aberration turbine blade should be 27m or more for the power generation capacity to be 1,000kW.

In general, when the aberration turbine with a blade diameter of more than 20m rotates at about 20rpm at high tidal flow speed, at the tip of the wing of the fastest aberration turbine, the pressure coefficient (Cp) is lower than the steam pressure, that is, the threshold of seawater. As a result, cavitation is likely to occur in the blades of the aberration turbine. And the resistance of algae generated at such high flow rates is a very important problem when installing generator housings and power generation structures, since only a few minutes of the day become slack water, so that the seawater moves through the foundation. Building and installing a tidal generator is a very difficult problem.

It is rare in the world that the average speed of algae that is effective for algae generation is more than 2.0m / s, and the depth of the seabed, terrain or accessibility is not desirable for algae in the area where the average speed of algae is 2.0m / s. It may not. In addition, there is a place where even the maximum speed of more than 6.0m / s even more than 2.0m is converted to kinetic energy, depending on the region, such as Korea's wool stone tree. The instantaneous maximum speed is an important design factor that must be considered in terms of durability and safety of the tidal generator, but it is also a cause of overdesign and high cost considering that the resistance of the tidal current is proportional to the square of the tidal velocity. The average speed of algae is the most important design factor in terms of continuous or rated power generation.

Another factor to consider when designing an algae generator is the turbulence intensity of the algae. This is because it causes a significant change in the load on the aberration turbine and power generation structure of the tidal current generator and is a major cause of fatigue and vibration problems of the machinery. Therefore, it is necessary to understand the degree of turbulence intensity of algae not only to place algae generators away from areas with strong laminar flow, but also to ensure the durability of machinery.

As mentioned above, the technical limitations of the existing algae generators developed by using the algae due to the natural phenomenon of tidal tides are as follows. (1) The average speed range of natural algae that can be used commercially is about 2.0 to 2.5 m / s, and (2) The limit of wing diameter of the aberration turbine of the algae generator is about 20 to 25 m. The power generation capacity per unit is limited to 1,000kW. In addition, (4) building foundations on the seabed and installing algae generators in fast tides is a major challenge, and (5) the durability of the machine is very difficult to secure due to the degree of turbulence of the algae and the resistance of tidal currents that change frequently. It is a task.

Recently, the inventors of the present invention devised an integrated power generation system that combines tidal power generation and current generation (patent 10-0867547, PCT / KR2008 / 001388) and a combined marine power generation system that combines hydrological and current generation (patented patent) 10-0883756, PCT / KR2008 / 002414), currents flowing through artificial marine structures, such as tidal power plants or tidal power generation systems, such as tidal power plants built in areas with large tidal flats, or drainage doors or hydrologic structures, It is found that the flow rate is much faster than the average speed of the algae.

In general, the generation capacity and design specifications of the current generators that can be installed where the current flows at high speed should be determined in consideration of the available current speed, depth of the sea, water level fluctuations on the sea side and the lake side, and seabed topography. On the other hand, the large-capacity algae generator of the existing concept, such as that developed in advanced marine countries, can not be installed where the high speed current flows.

The present invention devised to solve the problems of the prior art as described above provides a small-capacity current generator for high-speed current current that can be generated using the current flowing at a speed much faster than the speed of the tidal current due to tidal currents. The purpose is.

As a specific means of the small-capacity ocean current generator for the high speed current current of the present invention for achieving the above object, by forming an artificial marine structure, such as an integrated power generation system, a composite marine power generation system or a drainage lock or a hydrologic structure of the embankment, In the current generator for extracting electrical energy from the kinetic energy of the high speed current flowing into the sea and lake side through

It is characterized by the small sized large current current generator for high speed current, which has a small wing size of 5-12m and a power output of 0.5MW or more per water turbine.

In addition, the support pillar or monopile installed on the sea bed to support the small-capacity ocean current generator for high speed current flow is characterized in that the cross-sectional shape of the streamline or oval.

1. Economic ripple effect-to be installed on the ground

The small-capacity current generator for high-speed ocean current of the present invention, when constructing an ocean current power plant in conjunction with the construction of an offshore power generation system such as tidal power plant, a drainage lock of a sea repellent, or a hydrologic structure, closes the installation area of the current generation complex with a barrier. This can be safely installed at a much lower cost than the installation of an algae generator in the ocean, which leads to high economic benefits. In addition, the development of large-scale current generation complexes is premised on the mass production of current generators, so not only can a significant reduction in production costs, but also a reduction in production costs can be expected.

2. Technical ripple effect-Possible to develop by domestic original technology

The small-capacity ocean current generator for high speed current current of the present invention has the same power generation capacity, so that the size of the current generator turbine is much smaller than that of a general tidal current generator. It can be easily developed by utilizing wind turbine development technology.

In general, natural tidal currents generated by tidal tides change the direction of the flow four times a day according to tides, and are affected by the seabed topography.However, the currents that can be obtained through the marine power generation system or the drainage lock of the embankment are artificial marine structures and units. According to the operation plan of the facility, it is a high quality and well-developed turbulent seawater that flows continuously in one or two directions that can be predicted, and does not occur at the maximum speed such as wind power or tidal currents. It is much more favorable than the flow of algae, which includes kinetic energy with uniform velocity distribution and high utilization value.

3. Policy Ripple Effect

Feasibility study on the current-generation power plant in conjunction with the Sihwa Lake tidal power plant resulted in an ocean current power plant that is equivalent to about 20% of the power generation capacity of 254 MW of Sihwa Lake tidal power plant. It will greatly contribute to the achievement of marine energy supply targets. In addition, if the development of a large-scale ocean current power plant with the tidal power plant construction boom, not only the current generator industry, but also pioneering a new marine power plant industry, it will be a good new growth engine industry for Korea's future food.

1 is a satellite image of Google Earth showing the sea water is rapidly flowing from the sea side of the seawater drainage lock located in the southern end of the Saemangeum dike.

2 is a plan view of an integrated power generation system that combines tidal power generation and ocean current generation,

FIG. 3 is a side view of the aberration structure and the lake side current generation complex of the tidal power plant of FIG. 2, and FIG. 4 is an ocean current generator at this time.

FIG. 5 is a side view of the hydrologic structure and the offshore current generation complex of the tidal dam of FIG. 2, and FIG. 6 is the current generator at this time.

7 to 9 are examples of a small-capacity ocean current generator for high speed ocean current equipped with a three-wing water turbine turbine.

Figure 10 shows the relationship between the power generation output according to the current flow speed in the size of the blade diameter of the water turbine turbine 2-25m, the design range of the existing concept of the current generator and the design range of the small-capacity current generator for high speed current current of the present invention Shows.

11 shows a comparative comparison of the sizes of the small-capacity current generators (a) for high speed current currents, the algae generator (b) and the offshore wind generator (c) of the present invention when the same power generation capacity is 4MW.

12 to 17 are various modified examples of the small-capacity ocean current generator for high speed current according to the present invention, a single water turbine turbine (FIGS. 12, 13, and 14), a double water turbine turbine (FIGS. 15 and 16), and 3 Show the shape of the current generator consisting of a heavy water turbine (Fig. 17).

FIG. 18 supports the current generators 62 including a gearbox 60 and a large capacity generator 61, a hydraulic system and a cooling system, and a power converter installed on the exterior of the current generator nussel 58. FIG. The example installed in the upper board 63 hypothesized on the upper sea surface of the monofil F for dragons is shown.

10: Design range of small capacity ocean current generator for high speed current

20: Design range of existing concept algae generator

54: water turbine 55: water shaft

56 gear 57 intermediate shaft

58: Nussel 60: Gearbox

61: generator 62: power plant

63: top plate

100: tidal power plant 102: aberration structure

120: current side of the current generation complex 110: water turbine generator

200: tidal dam 210: hydrologic structure

212: sluice 220: offshore current development complex

300: connecting structure F: monopile, support column

LB: Lake Ground SB: Seabed

1 is a place where the small-capacity current generator for the high speed current current of the present invention can be applied, and a satellite of Google Earth showing the sea water flowing rapidly from the sea side to the lake side through a caustic drainage lock located at the south end of the Saemangeum embankment. It is a photograph.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a plan view of the integrated power generation system combined with tidal power generation and current generation according to the present invention, Figure 3 is a side view of the aberration structure and the lake side current generation complex of the tidal power station of Figure 2, Figure 4 is installed at this time 5 is a form of a possible current generator, and FIG. 5 shows a side view of the hydrologic structure of the tidal dam of FIG. 2 and the ocean current development complex, and FIG. 6 is a form of the current generator that can be installed at this time.

The integrated power generation system, which combines tidal power generation and ocean current generation, builds a seawall 10 that blocks the sea where the difference between tidal tides occurs as shown in FIG. 2.

After the fabricator 10 is constructed as described above, the lake 12 is formed as shown in FIG. 2. The tidal power generator 10 is provided with an tidal power plant 100 and an tidal dam 200 intercepting the lake side 12 and the sea side 14.

At this time, the tidal power plant 100 and the tidal dam 200 in the middle of the connection between the tidal power plant 100 and the tidal dam 200 is preferably arranged at a distance to the connection structure 300 or a connection aid.

The connecting structure 300 or the connecting aid may be built in the tens, hundreds, thousands, meters, or kilometers, depending on the topography of the current generation complex.

In the aberration structure 102 constituting the tidal power plant 100, an aberration for a tidal power having aberration blades 112 rotating in the flow of seawater flowing from the sea side 14 to the lake side 12 as shown in FIG. The generator 110 is installed.

The aberration structure 102 constituting the tidal power plant 100 illustrates that 10 aberration structures 102 are connected to each other by using one unit as shown in FIG. 2, but is limited thereto. The number of installations can vary depending on the nature or the plan of generation.

Behind the aberration structure 102 of the tidal power plant 100, that is, the lake side 12, a plurality of current generators 120 are generated using the flow of seawater discharged through the tidal power generation aberration generator 110 do. As described above, the plurality of current generators 120 are installed on the lake side 12 to form the lake side current generation complex 120.

As shown in FIGS. 2 and 3, the plurality of current generators 120 are disposed in a lattice form having a predetermined distance between the matrices by the diameter of the turbine blades of the current generators, but the odd thermal current generators 120C and the even thermal current generators ( 120D) is preferably arranged to be offset from each other.

The hydrologic structure 210 constituting the tidal dam 200 is provided with a hydrologic gate 212 as shown in FIG. 5. The sluice gate 212 is lowered by the hoisting device 214 at the time of creation to block seawater 14 from flowing into the lake side 12, and as the tide rises, the sluice gate 212 receives the seawater from the sluice channel 216. ) To discharge to the sea side (14).

The hydrological structure 210 constituting the tidal dam 200 illustrates eight hydrological structures 210 using one as a unit as shown in FIG. 2, but is limited thereto. Depending on your plan, the number of installations can vary.

On the other hand, behind the sluice 212 side of the sluice structure 210, that is, the sea side 14, using a number of high-speed seawater discharged to the sea through the sluice 212 as shown in Figures 2 and 5 Current generator 220 is installed. When the plurality of current generators 220 are installed on the sea side 14, the sea current generators 220 are formed.

Here, the current generators of the lake side current generation complex 120 and the sea side current generation complex 220 are respectively supported and installed on a support column or a monopile F installed in the sea floor.

In addition, the current generators of the lake-side current generation complex 120 and the sea-side current generation complex 220 includes a propeller that rotates to drive the flow of the current, and a generator having a rotor connected to the rotating shaft of the propeller.

In the above, the aberration structure 102 of the tidal power plant 100 and the hydrologic structure 210 of the tidal dam 200 are configured by connecting at least one or more as shown in FIG. 2.

On the other hand, according to the embodiment of the tidal power plant 100 and the tidal dam 200 in accordance with the plan of the topographical characteristics or the amount of power generation of the

current generation complexes

120, 220 of the tidal power plant 100 of the tidal power plant 100 A plurality of current generators may be installed only at the lake side 12 to form an integrated power generation system that combines tidal power generation and current generation, and a plurality of current generators 220 may be installed only at the seawater side 14 of the tidal dam 200. It is also possible to configure an integrated power generation system that combines tidal power generation and ocean current power generation, and as shown in Figure 2 a plurality of current generators on both the lake side 12 of the tidal power plant 100 and the sea water side 14 of the tidal dam 200 Each of the 120 and 220 may be installed to form an integrated power generation system that combines tidal power generation and ocean current generation.

In the embodiment configured as described above will be described the characteristics of the small-capacity current generator for high speed current current of the present invention.

In the current generation complex of the integrated power generation system configured as shown in FIG. Therefore, the current generator that can be installed in the current generation complex should be designed differently from the general tidal current generator. Accordingly, the present invention provides a small mass current generator suitable for the current flowing at high speed.

Generally, the generation capacity and specifications of the current generators that can be installed in the current generation complex are as follows: current speeds available in the waters before and after the tidal power plant, the size of the exit of the aberration structure of the tidal power plant, the depth of the sea, the water level fluctuations on the sea and lake sides, and the seabed topography In order to obtain the maximum power generation from the current generation complex, it is necessary to decide on the arrangement of the current generator in consideration of economic aspects.

Considering the location of the underwater space where the aquatic turbine of the current generator is disposed, it is desirable to have a clearance of about 2 to 3m from the bottom of the seabed to the wing tip of the aquatic turbine, as shown in Figs. In order to be less affected by climate change or floating material at sea, it is desirable to have a free space of 2m or more from the sea surface to the tip of the water turbine turbine as shown in FIGS. 4 and 6.

In the small-capacity ocean current generator for high speed current current of the present invention, an integrated power generation system as shown in FIG. 2 will be described by installing an ocean current power generation complex in the Sihwa Lake tidal power plant currently under construction. In the case of the Sihwa Lake tidal power plant, as shown in Fig. 3, the LB of the seabed in the region to be installed in the current side of the lake-side current generation complex is EL (-) 20.0m, and the minimum low water level of the lake is EL (-) 4.46m. Current generators can be installed in the water. Therefore, the lake side current generator of the aberration structure 102 of the tidal power plant 100 is preferably an ocean current generator having a wing diameter of about 10 m as shown in FIG. 4. In addition, as shown in FIG. 5, the bottom surface SB of the region where the ocean current generator installation of the tidal dam 200 hydrological structure 210 is installed is EL (-) 16.0 m, and the lowest water level of the sea is EL (-) 4.60 m, For example, current generators can be installed in water at least 11.4m deep. Therefore, the sea current generator of the tidal dam 200, the hydrologic structure 210 is preferably an ocean current generator having a blade diameter of about 8 m as shown in FIG. 6, and from about 2.0 to 3.0 m from the sea bottom to the tip of the water turbine turbine. It is desirable to allow a margin.

7, 8, and 9 are examples of propeller-type horizontal current generators equipped with a three-wing aberration turbine, which smooth the surface of the wing to avoid cavitation causing performance deterioration, and as shown in FIG. Due to the relatively low tangential speed at the root portion, the tip portion of the wing is preferably twisted so as to receive an optimal angle of attack, and the shape of the wing tip is preferably round as shown in FIG. 8. When the size of the aberration turbine blades is reduced, as is the case of the small-capacity ocean current generator for the high speed current current of the present invention, the wing tip speed is reduced, which is advantageous in preventing cavitation. In addition, in order to cope with frequent changes in the direction of the current, it is preferable that the cross section of the aberration turbine blades has an elliptic shape and a pitch control function corresponding to bidirectional flow. In addition, it is preferable to have a narrow streamline or elliptical cross-sectional shape of the vertical pillar for supporting the current generator in the direction of the sea current as shown in Figs. 4 and 6 to overcome the resistance of the high speed current, and as shown in Fig. 9, the nacelle is streamlined or elliptical. In order to minimize the resistance of the high speed current flowing in both directions.

On the other hand, according to the report of the numerical analysis and hydraulic model test of the Sihwa Lake tidal power plant construction, the tidal current of the Sihwa Lake tidal power plant is 6.0m / t after the tidal power generation is over 3.0m / s. The velocity of currents that may occur when the seawater is discharged to the lake side 12 after generation of tidal power generator 110 for tidal power generation with a capacity of 25.4 MW per unit from the potential energy of sea water having a 6.0 m difference. to be. However, it was reported that the speed of the current current is 6.0m / s or more when drained through the water gate 212 of the tidal dam 200, the hydrologic structure 210 at 1.9m free fall during fall. This is because there is no energy extracting device in the middle of the hydrologic structure 210 of the tidal dam 200, so that the potential energy of the seawater is converted into kinetic energy in the entire amount when raising the water gate 212. In this way, the sea current velocity generated when the potential energy due to the water head difference is converted into kinetic energy can be calculated from the following equation (2).

Where h is the head difference between the lake and sea, and g is the acceleration of gravity. For example, a 1.9 m water head changes from Eq. (2) to a current of about 6.1 m / s as the water passes through the tidal water of the tidal dam aberration, and about 10.8 m / s at 6.0 m. It changes to the current of velocity. Therefore, the current generator installed in such a fast current flows has a much smaller wing size of a water turbine than the existing concept of a tidal current generator designed to generate power using a current of 2 to 2.5 m / s. To get it.

Figure 10 shows the result of calculating the relationship between the power generation output according to the current speed when the size of the blade diameter of the water turbine turbine is 2-25m from Equation (1), the design range of the small-capacity current generator for high speed current current of the present invention (10) and the design range (20) of the existing tidal current generator is indicated by a rectangular box, respectively.

Table 1 below shows the relationship between the power generation amount for the rotational cross-sectional area (A, m ² ) and the tide velocity (V, m / s) of aberration turbine blades applied to a propeller type horizontal axis type tidal current generator.

Table 1

Current Generator	Wingspan	Current flow rate	Power generation
Lake side	10m
	3 m / s	0.43 MW
Seaside
	8m
	6 m / s	2.2 MW
Kilowatt Power = Cpideal 0.5ρηAV ^3, where Cpideal = 16/27 (Betz Law)

When the current velocity approaching the lake side current generator is 3m / s, as shown in Table 1 from Table 1, the amount of power generated by one current generator having a 10 m water wheel turbine blade is about 0.43 MW as shown in point A of FIG. As shown in FIG. 10, when the current velocity approaching the offshore current generator is 6 m / s, the power generation amount of one current generator with an aberration turbine blade of 8 m is about 2.2 MW as shown in point B of FIG. 10.

According to Figure 10 it can be seen that the design range 10 of the small-capacity current generator for high speed current current of the present invention is significantly different from the design range 20 of the general tidal current generator. In addition, the algae generators currently being developed in the developed countries correspond to the design range 20 of FIG. 10, which means that they cannot be used as they are at high speeds of 3.0 m / s or more.

As shown in the design range 20 of FIG. 10, in the existing tidal current generator, when the average speed of tidal current is 2.5m / s, even if the wing diameter of the water turbine is 20m, the power generation amount of the tidal current generator can be obtained from one water turbine. The limit is about 1.0 MW. However, there is no tidal current generator with a power generation capacity of this unit turbine.

In other words, according to FIG. 10, the average speed of the algae used in the existing algae power generation is limited to about 2.5 m / s. At this time, when the wing diameter of the water turbine turbine is less than 12 m, the amount of power generated by the existing algae generator is It is less than 0.5MW, and in order to obtain more than 1.0MW of power per unit, as shown in point C of FIG. 10, the wing diameter of the water turbine should be 20m or more.

On the other hand, in the current generation complex of the present inventors the integrated power generation system or the combined marine power generation system, since the average speed of the currents generated by the sea level difference reaches 3-11 m / s, the current generator installed here It has a design range (10) different from the conventional concept algae generator. At this time, the wing diameter of the water turbine generator can vary depending on the seabed topography conditions and the current plan for the construction of the current generation complex.The larger the depth of the sea, the larger the wing diameter of the water turbine can be. Considering that the resistance of the currents to withstand per unit of the turbines increases rapidly in proportion to the square of the blades of the turbines, the wing diameter of the turbines is preferably 5 to 12m to ensure structural stability of the current generators. In this case, the small-capacity current generator for high-speed current current of the present invention can obtain a large amount of power generation of as small as 0.5 MW to several MW per unit unit.

FIG. 11 is a comparative comparison of the sizes of the small-capacity ocean current generator (a) and the general tidal current generator (b) and the offshore wind power generator (c) for the high speed current current obtained from the result of FIG. 10 when the same power generation capacity is 4MW. It is. Here (b) is a conceptual diagram devised by the British Tidal Stream, 4MW class tidal power generation system consisting of four aberration turbines having a power capacity of 1.0MW per unit unit and a wing diameter of 20m at a tidal flow of 2.5m / s as shown in point C of FIG. It is imagined to be installed at a depth of 60 meters below sea level. 4MW large-scale offshore wind turbines such as (c) or 4MW class tidal power generators such as (b) are large in size and require a large investment in development. It is a difficult reality. However, the high speed current current generator of the present invention, as shown in the current generator design range 10 of FIG. 10, although large in size, but very small in size, has concentrated on the domestic wind turbine development technology and shipbuilding technology. In addition, the domestic technology alone is very likely to develop in a short time, and the development and investment costs will be very low. Therefore, the small-capacity current generator for the high speed ocean current of the present invention provides a new technology area and the opportunity of pioneering and preoccupying the global market.

12 to 17 are various modified examples of the small-capacity ocean current generator for a high speed current according to the present invention having a basic three-wheel type aberration turbine of the horizontal axis as shown in FIGS. 7 to 9. Figures 13 and 14 show the shapes of the current generators consisting of a double aberration turbine (Figs. 15 and 16) and a triple aberration turbine (Fig. 17).

As described above, the aberration turbine wing diameter of the small-capacity ocean current generator for the high speed current current of the present invention is much smaller than that of the algae generator generated by using the algae due to the natural phenomenon of tidal tides. However, in general, as the power generation capacity increases, the size of the gearbox and generator increases, so it is almost impossible to install the gearbox, generator, and auxiliary equipment in the nussel part of the current generator.

If there is a small high-capacity generator in addition to the small gear, there is no problem, but the size of the generator and the gearbox is determined according to the ratio of the type and gear of the generator, and in general, when the generating capacity is MW class, the high speed of the present invention Since it is too large compared to the wing size of the aberration turbine of the small current large-capacity current generator for ocean current, it cannot be installed inside the nussel of the current generator.

In order to solve the above problems, the small-capacity current generator for the high speed current current of the present invention is to remove the power generation facilities including the gearbox, the generator, the hydraulic system, the cooling system, and the power converter to the outside of the current generator nussel. desirable.

In FIG. 18, the kinetic energy of the high speed current flow is converted into the rotational force of the aberration shaft 55 connected to the aberration turbine 54, and then, the combination of the gear 56 and the intermediate rotation shaft 57 of the current generator nussel 58 is used. On the upper sea level of the monopile F for supporting the current generator, the power generation facilities 62 including the speed increase gear box 60, the large capacity generator 61, the hydraulic system and the cooling system, and the power converter installed outside are installed. The example which installed in the temporary upper board 63 is shown.

Therefore, in the seawater, since only the small water turbine turbine 54, the power transmission axle shaft 55, and the gear 56 can be installed inside the small nussel 58, it is possible to reduce the cause of the failure and make it small to receive the resistance of the current. have. In addition, the upper plate 63 is installed on the monopile for supporting the current generator generators 62 of the power generation facilities 62 including the speed increase gearbox 60, the generator 61, the hydraulic system and the cooling system, and the power converter. It can be installed on the surface of the sea, so that it is easy to prevent the breakdown of the generator due to water leakage, and can ensure the convenience of maintenance in case of failure.

As described above, the small-capacity ocean current generator for the high speed current current of the present invention has been described with reference to a limited embodiment and the drawing mainly on a horizontal three-wing shaped aberration turbine, but it has various shapes such as a vertical aberration turbine or a horizontal two-wing aberration turbine. It can also be applied to turbines.

In addition, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and will be described by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

In Korea, there are many tidal power plants under construction such as Sihwa Lake Tidal Power Plant, Garorim Tidal Power Plant, Ganghwa Island Tidal Power Plant, Incheon Bay Tidal Power Plant, etc., and the Saemangeum, Cheonsu Bay, Tidal power generation is also being considered in Asan Bay. In addition, Saemangeum's Gaeseong drainage gate located between Gunsan and Buan in Korea opens the floodgate when needed to distribute a large amount of seawater at a very high speed of 5.0m / s or more. The algae generators developed by marine developed countries to be suitable for algae with an average speed range of 2.0 to 2.5 m / s cannot be used where such high speed currents flow.

If we make full use of these conditions in Korea and accelerate the development of small-capacity ocean current generators for high speed ocean currents based on the accumulated technology of wind power and shipbuilding and offshore, Korea will be able to secure technological advantage in this field in a short time. In addition, it will be possible to obtain synergies to preoccupy the world market.

Claims

Seawall (14) partitioning the sea side (14) and the lake (12) side or integrated power generation system that combines tidal power plant and current generation power generation to the seawall (10), or the combined ocean that combines hydrologic and current generation to the seawall (10) In the current generator to generate power by using a high speed current flowing in the lake side and the sea side in one direction or in both directions through the drainage lock or hydrologic structure of the power generation system or the seawall (10),

The size of the aberration turbine blades of the current generator is 5m to 12m or less, the power generation gears including the gearbox 60, the generator 61 and the hydraulic system and cooling system and the power converter 62 to the current generator Small capacity large current current generator for high speed current, characterized in that installed outside the nussel (58).
The method according to claim 1,

A support pillar for supporting the current generator generator includes a speed increase gear box 60 installed at the outside of the current generator nussel 58 and a large capacity generator 61, a hydraulic system and a cooling system, and a power converter 62. Or a small capacity large current current generator for high speed current, characterized in that installed on the upper plate 63 installed on the upper sea surface of the mono pile (F),
The method according to claim 1,

The small-scale large-capacity current generator for high-speed current, characterized in that the cross-sectional shape of the support pillar or monopile (F) is installed in the seabed ground supporting the small-capacity current generator for the high speed current.
The method according to claim 1,

Small capacity for high speed current, characterized in that the wing of the water turbine turbine of the current generator is twisted a lot of the tip portion of the wing and the shape of the wing tip in a round shape so as to receive the optimum angle of attack due to the lower tangential speed than the root portion Current generator.