WO2007001154A1

WO2007001154A1 - Power generation apparatus using wind power and small hydro power

Info

Publication number: WO2007001154A1
Application number: PCT/KR2006/002498
Authority: WO
Inventors: Chi Bei Yoon
Original assignee: Korea New Solar Energy Co., Ltd.
Priority date: 2005-06-28
Filing date: 2006-06-27
Publication date: 2007-01-04

Abstract

Provided is an annexation power generation apparatus using wind power and water power. The power generation apparatus includes: a wind power generating unit for generating electric power using a wind power; a first small hydro power generating unit for generating electric power using water power by including a top reservoir, a water drop path, a plurality of hydraulic turbines and a bottom reservoir; a power storing unit for storing electric power from one of the wind power generating unit, the first small hydro power generating unit; a pumping unit for pumping the seawater of the bottom reservoir to the top reservoir; an electric power transferring unit for transferring the electric power; and a control unit for controlling the switching connections and controlling an amount of flowing the seawater from the top reservoir into the water drop path.

Description

ANNEXATION POWER GENERATION APPARATUS USING WIND POWER AND SMALL HYDRO POWER

Technical Field

[1] The present invention relates to a power generation apparatus; and more particularly, to an annexation power generation apparatus for stably and constantly supplying electric power to a small local area using wind power and small hydro power. Background Art

[2] Generally, power generators are an apparatus for providing an energy source required for daily life. The most of power generators generates the electric power using fossil fuel and nuclear energy. A thermal power generator generally uses fossil fuel and produces pollutants. Therefore, the thermal power generator has the problems of limited energy source and environment pollution. A nuclear power generator uses a nuclear power to generate electric power. Such a nuclear power generator has a critical problem, releases of radiation, for example, Chernobyl- style nuclear disaster. The nuclear power generator also has a problem of environment pollution caused by wastes as like the thermal power generator.

[3] In order to overcome the problems of the thermal power generator and the nuclear power generator, an environment friendly power generator was introduced. The environment friendly power generator uses the forces of nature such as solar heat, wind power, and hydraulic power to generate electric power.

[4] However, the environment friend power generator also has problems. In case of wind power plants, it is impossible to perfectly predict the direction of wind, the air volume of the wind, and the time of wind flow. Furthermore, the strength of the wind often becomes significantly reduced as low as the strength of the wind that cannot be used to generate electric power. Therefore, it is impossible for the wind power plants to stably generate the electric power using wind power. The frequent variations of the wind direction, the wind strength and the air volume may degrade the quality of the wind.

[5] Especially, a power generator for supplying electric power to a small local area such as a village is required to constantly generate electric power and stably provide the electric power for 24 hours of a day. However, it is impossible to provide the electric power for 24 hours of a day using the wind power generator. For example, in Korea, the wind power generator may generate power for about 6 hour to 12 hours a day. Furthermore, the wind power generator additionally requires a huge battery apparatus for constantly providing the electric power for 24 hours a day.

[6] In case of the hydro power generator, it is also impossible to accurately predict the time of raining and the amount of rainfall. For example, according to the weather of Korea, a summer is a raining season. Therefore, the amount of rainfall is insufficient at the fall, the winter and the spring although the amount of rainfall abruptly increases in the raining season (summer). Therefore, the amount of flowing water in rivers or watercourses may become insufficient to generate the electric power.

[7] In case of the hydro power plant using a dam, the nature environment is destroyed to build the dam although the hydro power plant is environment friendly power plant. Also, there are many delicate problems arisen for buying the properties from residents and migration of residents for building the dam. Therefore, the hydro power plant using the dam is not suitable for providing the electric power to a small local area such as a village.

Disclosure of Invention Technical Problem

[8] It is, therefore, an object of the present invention to provide an annexation power generation apparatus using wind power and hydro power for environment-friendly generating electric power and constantly providing the electric power to small local area. Technical Solution

[9] In accordance with one aspect of the present invention, there is provided an annexation power generation apparatus using wind power and water power including: a wind power generating unit including a plurality of wind power generators each generating electric power at about an air speed of about 2.5m/sec to 3.0m/sec; a first small hydro power generating unit including a top reservoir for storing seawater, a plurality of water drop paths each formed as a pipe and connected to the top reservoir for guiding the sweater in the top reservoir to a lower place, a first hydraulic turbine having a first water wheel disposed at an upper portion of the water drop path and rotating using the potential energy of the seawater flowing the top reservoir to the lower place, a second hydraulic turbine having a second water wheel disposed at an upper portion of the water drop path and rotating using the potential energy of the seawater flowing the top reservoir to the lower place, a third hydraulic turbine having a third water wheel disposed at an upper portion of the water drop path and rotating using the potential energy of the seawater flowing the top reservoir to the lower place, and a bottom reservoir connected to an end of the water drop path for storing the seawater dropped from the top reservoir; a power storing unit electrically connected to the wind power generating unit, the first, second and third hydraulic turbines through a first switching connection for receiving and storing electric power from the first switching connection of the wind power generating unit, the first, second and third hydraulic turbines; a pumping unit electrically connected to the wind power generating unit, and the first, second and third hydraulic turbines, and the charging unit through a second switching connection for pumping the seawater of the bottom reservoir to the top reservoir by receiving the electric power through the second switching connection of the wind power generating unit, and the first, second and third hydraulic turbines; an electric power transferring unit electrically connected to the wind power generating unit, and the first, second and third hydraulic turbines, and the charging unit through a third switching connection for transferring the electric power by receiving the electric power through the third switching connection of the wind power generating unit, and the first, second and third hydraulic turbines; and a control unit for controlling the first switching connection of the charging unit, the wind power generating unit, the first, second and third hydraulic turbine, the second switching connection of the pumping unit, and the wind power generating unit, the first, second and third hydraulic turbine, and the charging unit, the third switching connection of the electric power transferring unit, the wind power generating unit, the first, second an third hydraulic turbine, and the charging unit, and controlling an amount of flowing the seawater from the top reservoir into the water drop path.

Advantageous Effects

[10] An annexation power generation apparatus according to the present invention has following advantages.

[11] The annexation power generation apparatus according to the present invention uses wind power and small hydro power to generate the electric power. Therefore, the annexation power generation apparatus is an environment friendly power plant.

[12] Also, the annexation power generation apparatus according to the present invention can constantly generate the electric power by using both of the wind power and the small hydro power. Therefore, the annexation power generation apparatus according to the present invention can be used for stably providing the high quality electric power to a small local area where a large power plant cannot be built.

[13] Furthermore, the annexation power generation apparatus according to the present invention does not occupy huge area and is suitable to a mountain landform. Therefore, the annexation power generation apparatus according to the present invention is suitable to Korea.

[14] Since it is possible to sell residual electric power after supplying the electric power sufficiently to a small local area, the annexation power generation apparatus may economically give benefits to the local area. Brief Description of the Drawings

[15] The above and other objects and features of the present invention will become apparent from the following description of the preferred embodiments given in conjunction with the accompanying drawings, in which: [16] FIG. 1 is a schematic diagram illustrating an annexation power generation apparatus using wind power and hydro power according to an embodiment of the present invention; [17] FIG. 2 is a diagram illustrating a wind power generator in a wind power generating unit shown in FIG. 1 ; [18] FIG. 3 is a diagram illustrating an impeller of a wind power generator shown in

FIG. 2; [19] FIGs. 4 and 5 are a perspective view and a cross sectional view of a hydraulic turbine in a small hydro power generator in a first small hydro power generating unit shown in FIG. 1 ;

[20] FIG. 6 is a side elevation view of a hydraulic turbine shown in FIG. 4; and

[21] FIGs. 7 and 8 are a cross-sectional view and a plan view of a head drop path shown in FIG. 1.

Best Mode for Carrying Out the Invention [22] Other objects and aspects of the invention will become apparent from the following description of the embodiments with reference to the accompanying drawings, which is set forth hereinafter. [23] FIG. 1 is a schematic diagram illustrating an annexation power generation apparatus using wind power and hydro power according to an embodiment of the present invention. [24] Referring to FIG. 1, the annexation power generation apparatus 100 using wind power and small hydro power includes a wind power generating unit 200, a first small hydro power generating unit 300, a power storing unit 120, a pumping unit 370, a control unit 110 and a power transferring unit 130. [25] It is preferable that the wind power generating unit 200 may include at least one of wind power generators 210 so as to constantly generate the electric power when one of the power generators becomes unavailable. Since the annexation power generation apparatus according to the present embodiment is for a small local area, a plurality of wind power generators are separately disposed throughout a predetermined windy area for obtaining the maximum power generating efficiency. [26] The first small hydro power generating unit 300 includes a top reservoir 350, a first hydraulic turbine 310, a second hydraulic turbine 320, a third hydraulic turbine 330, a water drop path 340 and a bottom reservoir 360. [27] The top reservoir 350 is disposed above the first small hydro power generating unit

310 and stores seawater. The specific gravity of the seawater is higher than normal water when the seawater has a volume of about 1.02 to 1.05. Therefore, higher water drop energy can be obtained from the seawater compared to the normal water. Since the seawater has a lower freezing point than normal water, the seawater provides a higher operating rate of generating the electric power in a lower temperature. That is, the power generator can generate the electric power using seawater without any problems even in mountains where the temperature changes abruptly and the mean temperature is comparatively lower.

[28] The water drop path 340 is connected to the top reservoir 350 and guides the seawater stored in the top reservoir 350 flow into the bottom reservoir 360. It is preferable that the water drop path 340 is inclined at about 60°to 70°from the ground.

[29] Herein, if the inclination angle of the water drop path 340 is lower than 60°, the power generation efficiency becomes degraded because the dropping energy of the seawater is reduced. If the inclination angle of the water drop path 340 is higher than 70°, the life time of the first to third hydraulic turbine 310 to 330 are shortened because the dropping energy of the seawater is concentrated at the impellers thereof.

[30] When the annexation power generation apparatus 100 is built at a mountain landform, the water dropping path 340 may be conveniently built by disposing the water drop path 340 along the mountain slop. Therefore, it is very convenient to build the annexation power generation apparatus 100 at the mountain landform and the cost thereof may be reduced.

[31] The first hydraulic turbine 310 includes a first water wheel 311 disposed at the upper portion of the water drop path 340 and generates electric power using the potential energy of the seawater.

[32] The second hydraulic turbine 320 includes a second water wheel 321 disposed at a middle of the water drop path 340, and the third hydraulic turbine 330 includes a third water wheel 341 and generates the electric power using the seawater following through the water drop path 340.

[33] The power storing unit 120 includes a plurality of batteries (not shown) electrically connected each others. The power storing unit 120 receives the electric power through a first electrical switching connection between the wind power generating unit 200 and the first, second and third hydraulic turbine 310, 320 and 330, and stores the received electric power. The stored electric power may be used as a reserved power source when the annexation power generation apparatus is repaired or is in maintenance.

[34] The pumping unit 370 is electrically connected to the wind power generating unit

200, the first, second and third hydraulic turbine 310, 320 and 330, and the charging unit 120 through a second switching connection. The pumping unit 370 pumps the seawater in the bottom reservoir 360 to the top reservoir 350 by receiving the electric power from the one of the wind power generating unit 200, the first, second and third hydraulic turbine 310, 320 and 330, and the power storing unit 120.

[35] That is, the residual electric power of the wind power generating unit 200 is transformed to the potential energy of the seawater by pumping the seawater stored in the bottom reservoir 360 to the top reservoir 350 using the electric power generated from the wind power generating unit 200.

[36] Therefore, the first small hydraulic power generating unit 300 stably generates the electric power by accumulating the irregular wind power and provide the high quality electric power.

[37] The power transferring unit 130 transfers the electric power by being electrically connected to the wind power generating unit 200, the first, second and third hydraulic turbines 310, 320 and 330, and the power storing unit 120 through a third switch.

[38] That is, the power transferring unit 10 stably provides the electric power generated from the wind power generating unit 200, the first, the second, and the third hydraulic turbine 310, 320 and 330 directly to a small local area. Also, the power transferring unit 10 transfers the electric power stored in the power storing unit to the small local area, indirectly.

[39] The control unit 110 controls the first, second and third switching connections and controls the amount of seawater flowing into the water drop path 340 from the top reservoir 350.

[40] In other words, when the wind power generating unit 200 generates more electric power than demands, the residual electric power is stored in the power storing unit 120 or used to drive the pumping unit 370 to transform the residual electric power to the potential energy of the seawater. Furthermore, it is possible to sell the residual electric power to an electric power supply company such as Korea Electric Power Corporation.

[41] Also, the control unit 110 increases the amount of the seawater following the water drop path 340 from the top reservoir 350 when the wind power generating unit 200 generates less power than demands. The annexation power generating apparatus 100 according to the present embodiment can stably provide the electric power according to the demands thereof.

[42] It is preferable that the control unit 210 controls the first and second switching connection and the amount of seawater inflow the water drop path 340 by a computer program. Also, the first hydraulic turbine 310 may provide the electric power for driving the control unit 110.

[43] FIG. 2 is a diagram illustrating a wind power generator in a wind power generating unit shown in FIG. 1.

[44] Referring to FIG. 2, the wind power generator 210 in the wind power generating unit 200 includes a rotating axis 211, an impeller 212, a case 213 and a fly wheel 214.

[45] The impeller 212 includes impeller blades 2121 and impeller blade inclined tips

2122 coupled to the impeller blades 2121.

[46] The rotating axis 211 includes a first shaft 2111, a second shaft 2112, and a third shaft 2113. The first shaft 2111 and the second shaft 2112 are connected through a first joint 215. The second shaft 2112 and the third shaft 2113 are connected through a second joint 216. The case 123 may house the first, second and third shafts 2111, 2112 and 2113, and the first and second joints 215 and 216.

[47] It is preferable that the fly wheel 214 is made of material having the high moment of inertia to provide a stable rotating speed according to the intensity of the wind in order to compensate the irregular rotation of the rotating shaft 211 caused by irregularly generated wind power.

[48] FIG. 3 is a diagram illustrating an impeller of a wind power generator shown in

FIG. 2.

[49] Referring to FIG. 3, the impeller 212 of the wind power generator 210 includes impeller blades 2121 coupled around the circumference of the rotating axis 211 and impeller blade inclined tips 2122 integrally coupled to corresponding impeller blades 2121 and inclined at a predetermined angle from the impeller blades 2121 to effectively receiving the wind force.

[50] Herein, it is preferable that the impeller 212 may includes six impeller blades 2121.

Also, a plurality of impeller blades 2121 may be fixed around the rotating axis 211 in a star shape, and the rotating axis 211 is disposed vertically from the ground to receive strong energy even from a weak wind power and to allow bi-direction rotation.

[51] It is preferable that the inclination angle of the impeller blade inclined tip 2122 may be in about 28°to 32°. Also, the thickness and the size of the impeller blades 2121 may change.

[52] FIGs. 4 and 5 are a perspective view and a cross sectional view of a water wheel in a first, second, and third hydraulic turbine shown in FIG. 1. FIG. 6 is a side elevation view of a hydraulic turbine shown in FIG. 4.

[53] Referring to FIGs. 4 to 6, each of the first, second, and third hydraulic turbines 311,

321, and 331 includes a rotating axis 3111, a water wheel blade 3113, and a water fly wheel 3114.

[54] A plurality of water wheel blades 3113 are fixed around the circumference of the rotating axis 3111 in a star shape, and the water fly wheels 3114 are coupled at both ends of the rotating axis 3111 to make the rotating speed regular.

[55] A body 3112 may be assembled to house the rotating axis 3111, and the water wheel blades 3113 may be fixed around the circumference of the body 3112 in a star shape. Furthermore, bearings 3118 are disposed at both ends of the rotating axis 3111 to reduce the rolling friction of the rotating axis 3111.

[56] Herein, it is preferable that the water wheel may include 8 water wheel blades 3113, and the thickness of the water wheel blade 3113 may change. Also, the water wheel blade 3113 include a blade inclined tip 3115 and a supplementary blade 3116.

[57] It is preferable that the blade inclined tip 3115 may be integrally coupled to the water wheel blade 3113 and inclined at an obtuse angle from the water wheel blade 3113. The supplementary blade 3116 may be formed vertically from the water wheel blade 3113 in the coupling direction of the blade inclined tip 3115.

[58] The blade inclined tip 3115 and the supplementary blade 3116 form a space at the water wheel blade 3113, which is temporally soaked in the water. Therefore, the water wheel blade 3113 may further effectively receive the energy from the dropping water so as to improve the electric power generating efficiency.

[59] Moreover, the water wheel blade 3113 may include through-holes 3117 formed between the supplementary blade 3116 and the rotating axis 3111. The through-holes 3117 reduce the air resistance of the water wheel blade 3113. Therefore, the rolling resistance of the first, second and third hydraulic turbines 311, 321 and 331 prevent the dropping energy of the seawater from being wasted.

[60] Herein, it is preferable that the water wheel 331 is made of light and antirust material, and a speed changer gear or a v-belt may be coupled to the first, second and third hydraulic turbines 311, 321 and 331 as a power transferring unit.

[61] Furthermore, it is preferable that power generators (not shown) may be coupled at both ends of the rotating axis 333 of the first, second, and third hydraulic turbines 311, 321, and 331. That is, two power generators (not shown) may be coupled to the one rotating axis 3111 to further improve the power generating efficiency.

[62] FIGs. 7 and 8 are a cross-sectional view and a plan view of a water drop path shown in FIG. 1.

[63] Referring to FIGs. 7 and 8, it is preferable that the water drop path 340 of the first small hydraulic turbine is formed as a pipe shape. Also, the water drop path 340 may further include one or more air inflow pipe 341 formed in a star shape along the upper circumference of the water drop path 340.

[64] The air supplied from the air inflow pipe 341 is mixed with the seawater flowing along the water drop path 340 to make the flow of the water faster and constant. In other words, the air supplied from the air inflow pipe 341 prevents the inside of the water drop path 340 from being a vacuum state. Since the flows of the seawater and the air are separated, the air does not disturb the flow of the seawater.

[65] Therefore, the resistance inside the water drop path 340 prevents the water dropping energy from being wasted so as to increase the power generating efficiency.

[66] Furthermore, the annexation power generation apparatus 100 according to the present embodiment may further include a second small hydro power generating unit 400. The second small hydro power generating unit 400 includes a flesh water reservoir 410, a flesh water drop path 420 and a flesh water hydraulic turbine 430.

[67] The flesh water reservoir 410 is disposed above the second small hydro power generating unit 400, and stores rainwater, the water of a stream, and the water of a river.

[68] The flesh water drop path 420 is connected to the flesh water reservoir 410 and guides the water stored in the flesh water reservoir 410 and a flesh water hydraulic turbine 430. Herein, it is preferable that a plurality of the flesh water drop paths 420 may be disposed and formed in a pipe shape.

[69] It is preferable that the flesh water drop path 420 may be formed in the shape of the water drop path 340 of the first small hydro generating unit 300. That is, an air inflow pipe (not shown) may be formed along the upper circumference of the flesh water drop path 420. Therefore, the flesh water may smoothly flow along the flesh water drop path 420.

[70] The fresh water hydro generator 430 includes a plurality of flesh water hydraulic turbines (not shown) that are disposed at the flesh water drop path 430 and rotates using the motion energy of the flesh water flowing from the flesh water reservoir 410 to lower place.

[71] It is preferable that the fresh water hydraulic turbine (not shown) may be has same structure compared to the first, second and third hydraulic turbines 311, 321 and 331. Therefore, the detail description thereof is omitted.

[72] Furthermore, the first, second, and third switching connections may includes connections between the second small hydro generating unit 400 and the charging unit 120, between the second small hydro generating unit 400 and the pumping unit 370, and between the second small hydro generating unit 400 and the power transferring unit 130.

[73] That is, the control unit 110 drives the pumping unit 370 using the power generated from the second small hydro generating unit 400 so as to create and store the potential energy of the seawater and stores the electric power in the charging unit 120.

[74] That is, the annexation power generation apparatus 100 according to the present embodiment generates the electric power from the first small hydro power generating unit 300 disposed at the water drop path 340 by dropping the seawater stored in the top reservoir 310 to the bottom reservoir 360 through the water drop path 340.

[75] Then, the annexation power generation apparatus 100 pumps the seawater in the bottom reservoir 360 to the top reservoir 350 by driving the pumping unit 370 using the electric power generated from the wind power generating unit 200 and the first hydro power generating unit 300. Also, the pumping unit 370 may be driven using the electric power stored in the charging unit 120.

[76] Also, the second small hydro power generating unit 400 generates the electric power through dropping the flesh water such as the rainwater, the water of the stream and the water of the river. Therefore, the power generating efficiency is further improved

[77] While the present invention has been described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

Claims

[1] An annexation power generation apparatus using wind power and water power comprising: a wind power generating unit including a plurality of wind power generators each generating electric power at about an air speed of about 2.5m/sec to 3.0m/sec; a first small hydro power generating unit including a top reservoir for storing seawater, a plurality of water drop paths each formed as a pipe and connected to the top reservoir for guiding the sweater in the top reservoir to a lower place, a first hydraulic turbine having a first water wheel disposed at an upper portion of the water drop path and rotating using the potential energy of the seawater flowing the top reservoir to the lower place, a second hydraulic turbine having a second water wheel disposed at an upper portion of the water drop path and rotating using the potential energy of the seawater flowing the top reservoir to the lower place, a third hydraulic turbine having a third water wheel disposed at an upper portion of the water drop path and rotating using the potential energy of the seawater flowing the top reservoir to the lower place, and a bottom reservoir connected to an end of the water drop path for storing the seawater dropped from the top reservoir; a power storing unit electrically connected to the wind power generating unit, the first, second and third hydraulic turbines through a first switching connection for receiving and storing electric power from the first switching connection of the wind power generating unit, the first, second and third hydraulic turbines; a pumping unit electrically connected to the wind power generating unit, and the first, second and third hydraulic turbines, and the charging unit through a second switching connection for pumping the seawater of the bottom reservoir to the top reservoir by receiving the electric power through the second switching connection of the wind power generating unit, and the first, second and third hy draulic turbines; an electric power transferring unit electrically connected to the wind power generating unit, and the first, second and third hydraulic turbines, and the charging unit through a third switching connection for transferring the electric power by receiving the electric power through the third switching connection of the wind power generating unit, and the first, second and third hydraulic turbines; and a control unit for controlling the first switching connection of the charging unit, the wind power generating unit, the first, second and third hydraulic turbine, the second switching connection of the pumping unit, and the wind power generating unit, the first, second and third hydraulic turbine, and the charging unit, the third switching connection of the electric power transferring unit, the wind power generating unit, the first, second an third hydraulic turbine, and the charging unit, and controlling an amount of flowing the seawater from the top reservoir into the water drop path.

[2] The annexation power generation apparatus of claim 1, wherein the wind power generator includes: a rotating axis; a plurality of impeller blades fixed around a circumference of the rotating axis in a star shape; and a fly wheel axially connected to ends of the rotating axis to make the rolling speed of the rotating axis constant.

[3] The annexation power generation apparatus of claim 2, wherein each of the impeller blades includes: an impeller blade plate fixed at the circumference of the rotating axis; and an impeller blade inclined tip integrally coupled to the impeller blade plate and inclined outward from the impeller blade plate at about 28°and 32°

[4] The annexation power generation apparatus of claim 3, wherein each of the first, second and third hydraulic turbine includes: a rotating axis; a plurality of water wheel blades fixed around a circumference of the rotating axis in a star shape; a plurality of blade inclined tips integrally coupled to the water wheel blades inclined from the water wheel blade at an obtuse angle; and a supplementary blade vertically formed from the water wheel in the coupling direction of the water wheel blade.

[5] The annexation power generation apparatus of claim 4, wherein the water wheel blade includes a through- hole formed between the supplementary blade and the rotating axis.

[6] The annexation power generation apparatus of claim 5, wherein the water drop path of the first small hydro power generating unit is inclined at about 60°to

70°from the ground.

[7] The annexation power generation apparatus of claim 6, wherein the water drop path of the small hydro power generating unit further includes one or more air inflow pipes, which are formed in a star shape along an upper circumference of the water drop path.

[8] The annexation power generation apparatus of claim 7, further comprising a second small hydro power generating unit including a top fresh water reservoir for storing fresh water, a plurality of fresh water drop paths each formed in a pipe shape and connected to the top fresh water reservoir for guiding the fresh water in the top reservoir to a lower place, a plurality of hydraulic turbines rotating using the potential energy of the fresh water flowing the top reservoir to the lower place, wherein the first switching connection, the second switching connection and the third switching connection further include a switching connection between the second small hydro power generation unit and the charging unit, between the second small hydro power generation unit and the pumping unit, and between the second small hydro power generation unit and the power transferring unit, and wherein the control unit controls the first switching connection between the second small hydro power generation unit and the charging unit, the second switching connection between the second small hydro power generation unit and the pumping unit, and the third switching connection between the second small hydro power generation unit and the power transferring unit.

[9] The annexation power generation apparatus of claim 8, wherein the first hydraulic turbine, the second hydraulic turbine, and the third hydraulic turbine include a first water wheel, a second water wheel, a third water wheel, and the fresh water hydraulic turbine includes power generators disposed at both ends of a rotating axis thereof.

[10] The annexation power generation apparatus of claim 9, wherein the control unit receives the electric power from the first hydraulic turbine.