WO2020111360A1

WO2020111360A1 - Oscillating water column-type wave power generation system having flowrate control function

Info

Publication number: WO2020111360A1
Application number: PCT/KR2018/015320
Authority: WO
Inventors: 김길원; 최종수; 이정기; 고태경; 임창혁; 박지용; 오정환; 노찬
Original assignee: 한국해양과학기술원
Priority date: 2018-11-30
Filing date: 2018-12-05
Publication date: 2020-06-04
Also published as: KR102054957B1

Abstract

The present invention relates to an oscillating water column-type wave power generation system using sea wave energy, comprising: an oscillating water column chamber allowing seawater to flows therein or be discharged through a seawater inlet provided at one side thereof; an air flow path which is connected to the inside of the oscillating water column chamber, and which allows air to flow therein according to the inflow or discharge of the seawater; a turbine which is provided inside the air flow path and which produces power while rotating according to the flow of air through the air flow path; a flowrate control duct which is provided inside the air flow path and which controls the degree of air flow; and a control unit for controlling the operation of the flowrate control duct, wherein the flowrate control duct includes: an inner pipe forming an inner pipeline; an outer pipe provided so as to encompass the outer circumference of the inner pipe, and spaced from the inner pipe so as to form an outer pipeline; and a control valve which is provided at the outer pipeline, and of which the opening/closing is determined according to a signal of the control unit. Therefore, the present invention regulates, from information about the RPM of the turbine, the flowrate of the air moving in the inner pipeline and the outer pipeline of the flowrate control duct, and thus is effective in maintaining the rated capacity of the power produced by the turbine.

Description

Vibration-based wave power generation system with flow control function

The present invention relates to a vibration-based wave power generation system having a flow rate control function, and more specifically, a flow rate control function for controlling the flow rate of the air rotating the turbine in order to maintain the rated capacity of the turbine in the vibration-based wave power generation system. The present invention relates to a vibration-based wave power generation system.

In general, wave energy is highly profitable because it can be predicted compared to solar energy or wind energy, and can be dispatched using a power grid. Among the generators using the wave energy, the frequency-based wave power generation is a trend that is widely developed at home and abroad because of its simple structure and easy use in combination with existing structures such as breakwaters.

The vibration-based wave power generation system converts blue energy into air flow energy, converts mechanical energy through rotation of a turbine or the like using air flow energy, and converts mechanical energy into electric energy to produce electric power.

Since the frequency-based wave power generation system changes in the flow rate of air moved to the turbine according to the deviation of the blue energy, there is a problem in that the power generation amount is irregular, and the power of the rated capacity is stably generated according to the changes caused by wave height, wave period, etc. There is a problem that it is difficult to produce.

In order to solve the above problems, as a technology related to the conventional vibration-based wave power generation system, in Korean Patent No. 10-1085907, the volume of air or seawater flowing in the air chamber is changed by changing the internal volume while moving one side of the air chamber. Disclosed is an oscillating wave-type wave power generation device capable of stably generating power regardless of changes in wave height or wave period due to wave adjustment. In addition, Korean Patent Registration No. 10-1871249 discloses a structure for controlling the flow rate of the incoming seawater while moving one side of the chamber skirt through which the seawater flows up and down through the lazy gear and the pinion gear.

However, the above conventional technology has a disadvantage that initial installation cost and construction period are increased and maintenance is difficult.

[Advanced technical literature]

[Patent Document]

Korea Registered Patent No. 10-1085907

Korea Registered Patent No. 10-1871249

The present invention was created to improve the problems of the prior art as described above, and it is easy to maintain the rated power of the produced power, and at the same time, a vibration-based wave power generation system having a flow control function capable of reducing installation cost and shortening construction period. to provide.

In addition, a vibration-based wave power generation system having a flow control function that is easy to replace in the event of malfunction and is easy to maintain is provided.

In the vibration-based wave power generation system for generating electric power by using the air flow generated by the blue wave in the sea, the sea water inlet or discharge through the sea water inlet provided on one side of the vibration receiving chamber, the inside of the vibration receiving chamber and Connected and provided in the air flow path, the air flow path through which air flows according to the inflow or outflow of seawater, and is provided inside the turbine, the air flow path, which produces electricity while rotating according to the flow of air, and the degree of air flow. It includes a flow control duct for controlling the flow and a control unit for controlling the operation of the flow control duct, the flow control duct is provided to surround the outer circumference of the inner pipe, the inner pipe forming the inner pipe and spaced apart from the inner pipe to the outer pipe It is provided on the outer pipe and the outer pipe forming the and includes a control valve for determining whether to open and close according to the signal of the control unit.

In addition, the turbine can be arranged on the centerline of the inner tube.

In addition, the control unit may receive information on the RPM of the turbine, open the control valve when the RPM of the turbine is greater than or equal to the set range, and close the control valve when the RPM of the turbine is less than or equal to the set range.

In addition, a plurality of control valves are provided along the outer circumference of the inner tube, and the control unit can independently open and close the plurality of control valves, respectively.

In addition, the control unit can differentially adjust the ratio of the control valve to be opened among the plurality of control valves according to the RPM of the turbine.

In addition, the inner diameter of the inner tube may gradually decrease in the direction of the turbine in the vibration receiving chamber.

In addition, it may be provided in the internal pipeline further includes an auxiliary valve whose opening and closing degree is determined according to a signal from the control unit.

According to an embodiment of the present invention, since the degree of air flow is controlled, it is easy to maintain the rated capacity of power produced by the turbine.

In addition, since the opening and closing degree of the control valve is adjusted based on the information on the RPM of the turbine through the control unit, there is an advantage of automatically maintaining the set power generation amount.

In addition, since the effect of lowering the peak value of the RPM of the turbine can be expected to improve the durability of the turbine.

1 is a schematic diagram showing a vibration-based wave power generation system according to an embodiment of the present invention.

Figure 2 is a perspective view showing the operating state of the flow control duct according to an embodiment of the present invention.

3 is a block diagram showing a control unit according to an embodiment of the present invention.

4 is an exemplary view showing a flow control duct according to an embodiment of the present invention.

In the description of the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

The embodiments according to the concept of the present invention may be modified in various ways and have various forms, and thus specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiment according to the concept of the present invention to a specific disclosure form, and it should be understood to include all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

The terminology used herein is only used to describe a specific embodiment, and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the "inclusive" or "gajida" and the terms are staking the features, numbers, steps, operations, elements, parts or geotyiji to be a combination thereof specify the presence, of one or more other features, integers It should be understood that it does not preclude the presence or addition possibilities of, steps, actions, components, parts or combinations thereof.

Hereinafter, the present invention will be described in detail.

Referring to FIG. 1, the wave power generation system according to the present invention is a system for generating turbine 400 by flowing air according to the reciprocating motion of blue waves generated at sea, and is supported on the seabed or supported by structures such as breakwaters. The furnace converts blue energy into mechanical energy according to the rotation of the turbine, and converts mechanical energy into electrical energy.

The vibration-based wave power generation system having a flow rate control function according to an embodiment of the present invention is a vibration-based wave power generation system that generates electric power by using air flow generated by the sea wave, the seawater inlet provided on one side ( 110) a vibration water receiving chamber 100 through which the sea water flows in or out, an air flow path 200 connected to the inside of the vibration water receiving chamber 100 and through which air flows according to the inflow or discharge of the sea water, the It is provided inside the air flow path 200 and is provided in the turbine 400, which is rotated according to the flow of air through the air flow path 200 to produce electric power, and inside the air flow path 200 and flows of air It includes a flow rate control duct 300 for adjusting the degree and a control unit 500 for controlling the operation of the flow rate control duct 300.

The vibration receiving chamber 100 is provided with a seawater inlet 110 opened on one side, and the interior of the vibration receiving chamber 100 is occupied by air and seawater. As the seawater flows into or out of the seawater inlet 110 due to the wave, the seawater level inside the vibration receiving chamber 100 varies. As the water level changes, the air located above the sea water flows inside the vibration receiving chamber 100. The shape, material, and structure of the vibration receiving chamber 100 is not particularly limited as long as it can flow the air located therein by blue waves.

The air flow path 200 is a space through which air connected to the inside of the vibration receiving chamber 100 flows, and is preferably located above the sea water inlet 110. In the air flow path 200, one side communicates with the inside of the vibration receiving chamber 100 and the other side communicates with the outside, so that the air inside the vibration receiving chamber 100 passes through the air flow path 200 by blue. The external air may be moved to the vibration receiving chamber 100. The movement of air as described above generates electric power while rotating the turbine 400.

Various types of the turbine 400 may be used, and detailed description is omitted so as not to obscure the subject matter of the present invention.

2 is a perspective view showing an operating state of the flow control duct 300 according to an embodiment of the present invention. FIG. 2(a) shows a state in which the control valve 322 is closed, and FIG. 2(b) shows a state in which the control valve 322 is opened.

Referring to Figure 2, the air flow path 200 of the present invention is provided with a flow control duct 300 for adjusting the degree of air flow. The flow control duct 300 is arranged to block the movement of air through the air flow path 200 so that the air located inside the vibration receiving chamber 100 moves only through the flow control duct 300. desirable.

In the present invention, the flow control duct 300 may have a double tube shape. Specifically, the flow control duct 300 is provided to surround the outer circumference of the inner pipe 310 and the inner pipe 310 forming the inner pipe 311 and is spaced apart from the inner pipe 310 to the outer pipe An external pipe 320 forming the 321 and a control valve 322 provided in the external pipe 321 and determined whether to open or close according to a signal from the control unit 500 may be included.

Air is moved to the inner pipe 311 formed inside the inner pipe 310 and the outer pipe 321 formed between the inner pipe 310 and the outer pipe 320, and the inner pipe 311 The external channels 321 may be blocked from each other. Specifically, for example, the flow control duct 300 is installed in a standing state on one side of the air flow path 200 in a thin plate shape, and the inner pipe 310 forming the inner pipe 311 is The flow control duct 300 is provided to be concentric with the outer pipe 320 forming the outer pipe 321 may be provided to be concentric with the inner pipe 310. In this case, the inner tube 310 and the outer tube 320 may have a ring shape. In addition, for another example, the inner pipe 310 and the outer pipe 320 are arranged to be concentric with the flow control duct 300 in a cylindrical shape, and the air and the outer pipe 321 moving the inner pipe 311 ) Moving air may be blocked from each other.

In the present invention, by dividing the inner pipe 311 and the outer pipe 321 separately as described above, the flow rate of the air passing through the inner pipe 311 and/or the air passing through the outer pipe 321 is regulated to generate the turbine 400. The power generated from is maintained at the rated capacity.

In one embodiment of the present invention, the turbine 400 may be disposed on the center line of the inner tube 310. In this case, the air passing through the inner pipe 311 has a greater influence on the rotation of the turbine 400, and the air passing through the outer pipe 321 has less influence on the rotation of the turbine 400. I do it. That is, it is possible to maintain the rated capacity of the electric power produced by adjusting the RPM of the turbine 400 according to the flow rate control of the air passing through the external pipe 321.

A control valve 322 is provided in the outer pipe 321 or the outer pipe 320, and the control valve 322 controls the flow rate of air passing through the outer pipe 321. When the control valve 322 is opened, air may move through the outer pipe 321, but when closed, the air passes only the inner pipe 311.

The control valve 322 may be a throttle valve method in which the degree of opening and closing is adjusted in a state in which the external pipe 321 is blocked, and the opening and closing of the control valve 322 may be performed by the control unit 500. It can be operated according to the open/close signal.

In addition, the control valve 322 may be plural, and the plural control valves 322 may be radially arranged based on the center of the flow control duct 300. That is, a plurality of control valves 322 may be provided along the outer circumference of the inner tube 310. In this case, each of the plurality of control valves 322 is independently controlled to open and close, and the control unit 500 may generate an open and close signal to open and close each of the plurality of control valves 322 independently.

The degree of opening and closing of the control valve 322 may be controlled by the control unit 500 of the present invention. The control unit 500 may be connected to the control valve 322, the turbine 400, and the like by wire or wirelessly, and transmits an opening/closing signal to the control valve 322. The control unit 500 may be provided outside the air flow path 200 if it is possible to communicate with the control valve 322, the turbine 400, and the like.

3 is a block diagram showing a control unit 500 according to an embodiment of the present invention.

* Referring to FIG. 3, the air flow control through the control unit 500 will be described in detail. For example, the control unit 500 receives information on the RPM of the turbine 400, and the turbine ( When the RPM of 400) is greater than or equal to the set range, the control valve 322 may be opened, and when the RPM of the turbine 400 is less than or equal to the set range, the control valve 322 may be closed. In this case, when the RPM of the turbine 400 is greater than or equal to a set range, power generation through the turbine 400 is excessive, so the control valve 322 is opened to open air through the inner pipe 311 and the outer pipe 321. Flow to lower the RPM of the turbine 400, and if the RPM of the turbine 400 is below a set range, power generation through the turban is understated, so the control valve 322 is closed to only the internal pipeline 311. A mechanism to increase the RPM of the turbine 400 by flowing air is applied.

In addition, the control unit 500 may adjust the opening and closing degree of the control valve 322 step by step, for example, the control unit 500 is set from 1 to N to increase the RPM of the turbine 400 sequentially It can be divided into sections, and the degree of opening can be adjusted step by step from full opening to full closing of the control valve 322 according to the RPM corresponding to the section from N to 1.

For another example, the control unit 500 may differentially adjust the ratio of the control valve 322 to be opened among the plurality of control valves 322 according to the RPM of the turbine 400. Specifically, assuming a case in which the RPM of the turbine 400 is divided into sections set from 1 to N, the control valve 322 may control the plurality of control valves 322 according to the RPM corresponding to the section from N to 1 Among them, the number of control valves 322 that are open or closed is adjusted in stages.

When the above mechanism is applied, the control valve 322 is automatically adjusted according to the RPM of the turbine 400, thereby making it easier to maintain the required rated capacity.

In one embodiment of the present invention, the inner pipe 311 may be provided with an auxiliary valve 312 that receives and receives an opening/closing signal from the control unit 500 to adjust the opening/closing degree. The auxiliary valve 312 may have the same structure as the control valve 322. The degree of opening and closing is controlled independently of the control valve 322. For example, in case the control unit 500 closes the control valve 322 and lowers the opening ratio of the auxiliary valve 312, the moving speed of air passing through the auxiliary valve 312 becomes faster, and the turbine ( The RPM of the 400) can be increased, and on the contrary, the RPM of the turbine 400 can be lowered by opening both the control valve 322 and the auxiliary valve 312.

4 is an exemplary view showing a flow control duct 300 according to an embodiment of the present invention.

Referring to FIG. 4, in one embodiment of the present invention, the inner tube 310 may gradually decrease in inner diameter in the direction of the turbine 400 in the vibration receiving chamber 100. As the diameter of the inner pipe 310 decreases, the cross-sectional area of the inner pipe 311 gradually decreases as it progresses in the direction of the turbine 400, and accordingly, the turbine 400 in the vibration receiving chamber 100 The air moving in the direction may be compressed to increase the power output of the turbine 400.

In addition, the outer tube 320 may gradually increase the inner diameter in the direction of the turbine 400 from the vibration receiving chamber 100. In this case, the cross-sectional area of the outer pipe 321 gradually increases as it progresses in the direction of the turbine 400.

When the control valve 322 is opened, the external pipe 320 having the above shape has a turbine in the vibration receiving chamber 100 as the air passing through the control valve 322 increases in cross-sectional area of the external pipe 321. As it expands when moving in the direction of (400), it is easier to lower it to the set RPM when excessive RPM is measured.

The above-described structure in which the inner tube 310 gradually decreases in the direction of the turbine 400 and the structure in which the outer tube 320 gradually increases in diameter in the direction of the turbine 400 may be applied simultaneously.

In the present invention, the flow control duct 300 may be plural, and when one flow control duct 300 is disposed in the direction of the vibration receiving chamber 100, the other flow control duct 300 is external. Direction. In this case, the turbine 400 is positioned between the plurality of flow control ducts 300, and the air moving from the vibration receiving chamber 100 to the air flow path 200 is disposed in the direction of the vibration receiving chamber 100. The flow is controlled through the flow control duct 300, and the air moving from the outside to the air flow path 200 is controlled through the flow control duct 300 disposed in the external direction.

For example, when air is moved in the direction of the turbine 400 from the vibration receiving chamber 100 to increase the RPM of the turbine 400, the flow control duct 300 disposed in the direction of the vibration receiving chamber 100 ) In the state of closing the control valve 322 and opening the auxiliary valve 312, both the control valve 322 and the auxiliary valve 312 of the flow control duct 300 arranged in the outside direction are opened, and the outside In the case of air movement in the direction of the turbine 400, the control valve 322 of the flow rate control duct 300 disposed in the outside direction is closed and the auxiliary valve 312 is opened, and the vibration receiving chamber 100 The control valve 322 and the auxiliary valve 312 of the flow control duct 300 arranged in the direction may be opened.

When controlling the air flow rate through the plurality of flow control ducts 300, the control unit 500 flow rate control ducts arranged in the direction of the vibration receiving chamber 100 when the internal water level of the vibration receiving chamber 100 increases By regulating each of the flow control ducts 300 and the flow control ducts 300 arranged in the outer direction, power generation of the rated capacity becomes easier.

In addition, although not shown in the drawing, in one embodiment of the present invention, the plurality of flow control ducts 300 may be connected to each other with the inner tubes 310 or the outer tubes 320 with each other. The plurality of flow control ducts 300 connected to each other between the inner pipes 310 generates electricity by rotating the turbine 400 only by air moving through the inner pipes 311 connected to each other.

As described above, the flow rate control of the air using the flow rate control duct 300 according to the present invention can maintain the set power production capacity of the turbine 400 regardless of the deviation of the blue energy, and excessively of the turbine 400 It can be expected to improve the durability of the turbine 400 by preventing the RPM from rising or falling.

[Description of codes]

100: vibration receiving chamber

110: seawater inlet

200: air flow path

300: flow control duct

310: inner tube

311: internal pipeline

312: auxiliary valve

320: outer tube

321: External pipeline

322: control valve

400: turbine

500: control unit

According to the present invention, it is possible to stably produce electric power despite variable blue energy, and to improve the durability of the turbine by controlling the air movement path according to the RPM of the turbine, and to continuously produce an appropriate level of electric power. There is an advantage that can be immediately applied to the frequency-based wave power structure used.

Claims

In the wave-based wave power generation system for generating electric power by using the air flow generated by the sea wave,

A vibration receiving chamber in which seawater is introduced or discharged through the seawater inlet provided on one side;

An air flow path connected to the inside of the vibration water main chamber and through which air flows according to inflow or outflow of seawater;

A turbine provided inside the air flow path and rotating to generate power while being rotated according to air flow through the air flow path;

A flow control duct provided inside the air flow path and controlling the flow of air; And

Includes a control unit for controlling the operation of the flow control duct;

The flow control duct,

An inner pipe forming an inner pipe;

An outer tube provided to surround the outer periphery of the inner tube and spaced apart from the inner tube to form an outer tube; And

A vibration-based wave power generation system having a flow control function, characterized in that it comprises; a control valve provided in the external pipeline and determining whether to open or close according to the signal of the control unit.
According to claim 1,

The turbine is a vibration-based wave power generation system having a flow control function, characterized in that disposed on the center line of the inner tube.
According to claim 1,

The control unit,

Receive information about the RPM of the turbine,

When the RPM of the turbine is higher than the set range, the control valve is opened,

A vibration-based wave power generation system having a flow rate control function, characterized in that the control valve is closed when the RPM of the turbine is below the set range.
According to claim 3,

The control valve is provided with a plurality along the outer circumference of the inner tube,

The controller is a frequency-driven wave power generation system having a flow control function, characterized in that each of the plurality of control valves are opened and closed independently.
The method of claim 4,

The control unit,

Vibration-based wave power generation system having a flow control function, characterized in that the differential control of the ratio of the control valve to be opened among the plurality of control valves according to the RPM of the turbine.
According to claim 2,

The inner tube is a vibration-based wave power generation system having a flow control function, characterized in that the inner diameter gradually decreases in the direction of the turbine from the vibration receiving chamber.
According to claim 1,

A vibration-based wave power generation system having a flow control function, characterized in that it further includes an auxiliary valve provided in the internal pipeline and the opening and closing degree is determined according to the signal of the control unit.