KR20230089347A - Small power generation system - Google Patents

Abstract

The present embodiment relates to a small power generation system, and more particularly, to a small power generation system that divides and stores power generated by a renewable energy generator in a battery and a flywheel.

Description

Small power generation system {SMALL POWER GENERATION SYSTEM}

This embodiment relates to a compact power generation system.

In general, a generator is a device that converts various energy sources into mechanical devices and produces electrical energy, and is an indispensable device in modern society.

In general, when camping or growing crops in a mountain or valley, since power cannot be supplied from a commercial power grid, a small generator that generates power on its own must be used. Here, existing small generators can cause environmental pollution because they are driven by burning gasoline or diesel, and maintenance is difficult because their structures are complicated, and failures also frequently occur.

Recently, small renewable energy generation systems such as small solar power generation and small wind power generation have replaced small generators using engines, but batteries that can be charged and discharged to store surplus power in existing small new renewable energy generation systems had to use

Here, since the battery is expensive, there are many restrictions in terms of cost to increase the size or quantity of the battery in a small renewable energy generation system.

Against this background, an object of the present embodiment is, in one aspect, to provide a compact power generation system that does not cause environmental pollution.

On the other hand, to provide a compact power generation system for dividing and storing the power generated by the renewable energy generator in a battery and a flywheel.

In order to achieve the above object, one embodiment, DC (Direct Current) generation power received from a renewable energy generator DC / DC converter for converting any one of battery charging power and first motor driving power; a generated power storage unit including one or more batteries and receiving the battery charging power from the DC/DC converter to charge the one or more batteries; a flywheel energy storage unit receiving the first motor driving power from the DC/DC converter, converting the first motor driving power into first rotational kinetic energy, and storing the first rotational kinetic energy; and receives generation power amount information from the DC/DC converter, and receives SOC (State Of Charge) information for the one or more batteries from the first generated power storage unit, wherein the generated power amount information is greater than or equal to a reference power amount, and the SOC If the information is less than or equal to the reference charging amount, the DC/DC converter controls the DC generation power to be converted into the battery charging power, and if the generated power amount information is greater than or equal to the reference amount of power and the SOC information is greater than the reference charging amount, the DC generation power is controlled to be converted into the battery charging power. It provides a compact power generation system including a control unit for controlling to convert the DC generated power from a /DC converter into the first motor driving power.

The small power generation system may include a first switch connecting or disconnecting a first power transmission path between the DC/DC converter and the generated power storage unit; and a second switch for connecting or disconnecting a second power transmission path between the DC/DC converter and the flywheel energy storage unit, wherein the control unit determines that the generated power amount information is greater than or equal to the reference power amount and the SOC information is the reference power amount information. If the amount of charge is less than or equal to the amount of charge, the first switch controls to connect the first power transmission path and controls the second switch to cut off the second power transmission path, and if the generated power amount information is equal to or greater than the reference power amount, the second power transmission path is controlled to be disconnected. If the SOC information exceeds the reference charging amount, the first switch may control to cut off the first power transmission path and control the second switch to connect the second power transmission path.

The control unit controls the flywheel energy storage unit to convert the first rotational kinetic energy into battery charging power and output it to the generated power storage unit when the generated power amount information is less than the reference amount of power and the SOC information is less than or equal to the reference charging amount. can do.

The flywheel energy storage unit may include an electric motor that receives and drives the first motor driving power; A first rotating body having one or more permanent magnets attached to one surface, coupled to the electric motor on the other surface, and rotating by driving the electric motor to convert the driving power of the first motor into the first rotational kinetic energy; a second rotating body, one surface of which is disposed to face the first rotating body, and rotates together with the first rotating body by an attraction or a repulsive force generated by a magnetic field of the permanent magnet when the first rotating body rotates; And coupled to the other surface of the second rotating body, when the generated power amount information is less than the reference amount of power and the SOC information is less than or equal to the reference charging amount, the first rotational kinetic energy stored in the first rotating body is transferred to the second rotating body. It may include a generator-combined electric motor that receives power through the rotating body to generate the battery charging power and outputs the battery charging power to the generated power storage unit.

If the generated power amount information is less than the reference amount of power and the SOC information is greater than the reference charge amount, the controller generates second motor driving power (the second motor driving power is equal to the first motor driving power) in the generated power storage unit. or other value) may be controlled to be output to the generator combined electric motor, and the generator combined electric motor may be controlled to receive and drive the second motor driving power.

The second rotating body is rotated by the driving of the generator-combined electric motor to convert the second motor driving power into second rotational kinetic energy, and the control unit stores the generated power when the SOC information reaches the reference charging amount. The unit may control to stop outputting the second motor driving power.

The small power generation system includes a first switch connecting or disconnecting a first power transmission path between the DC/DC converter and the generated power storage unit; a second switch connecting or disconnecting a second power transmission path between the DC/DC converter and the electric motor; and a third switch connecting or disconnecting a third power transmission path between the generator combined electric motor and the generated power storage unit.

When the generated power amount information is less than the reference amount of power and the SOC information is less than or equal to the reference charge amount, the controller blocks the first power transmission path and the second switch blocks the second power transmission path. In addition to controlling to do so, the third switch may control to connect the third power transmission path.

The control unit controls the second switch to block the second power transmission path when the generated power amount information is less than the reference amount of power and the SOC information exceeds the reference charge amount, and the third switch controls the third power amount It can be controlled to connect the transmission path.

As described above, according to the present embodiment, since the small power generation system generates power using renewable energy, it is possible to generate power in an environmentally friendly manner.

In addition, since the power generated by the renewable energy generator is divided and stored in the generated power storage unit and the flywheel energy storage unit, costs for increasing the size or quantity of batteries in a small power generation system can be reduced.

1 is a configuration diagram of a compact power generation system according to an embodiment.
2 is a configuration diagram of a compact power generation system according to another embodiment.
3 is a flowchart illustrating a process of charging DC generated power to a generated power storage unit in a small power generation system according to another embodiment.
4 is a flowchart illustrating a process of storing DC generated power in a flywheel energy storage unit in a small power generation system according to another embodiment.
5 is a flowchart illustrating a process of charging a generated power storage unit with energy stored in a flywheel energy storage unit in a small power generation system according to another embodiment.
6 is a flowchart illustrating a process of storing power of the generated power storage unit in the flywheel energy storage unit in a small power generation system according to another embodiment.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is directly connected or connectable to the other element, but there is another element between the elements. It will be understood that elements may be “connected”, “coupled” or “connected”.

1 is a configuration diagram of a compact power generation system according to an embodiment.

Referring to FIG. 1, a compact power generation system 100 according to an embodiment includes a renewable energy power generation module 110, a power generation unit 120, an auxiliary power generator 130, a rotational force transmission unit 140, a control unit ( 150) and an energy storage unit 160.

The renewable energy generation module 110 may include a water turbine module and a windmill module. Renewable energy generation module 110 may be detachable to the connector 132 coupled to the rotation shaft 134 of the auxiliary power generator 130. For example, when the small power generation system 100 generates wind power, a windmill module may be attached to the connector 132 .

When the small power generation system 100 generates hydroelectric power, an aberration module may be attached to the connector 132 .

The power generation unit 120 receives the rotational force of the renewable energy generation module 110 through the rotational force transmission unit 140 . Through this, the rotating shaft 122 of the power generation unit 120 rotates, and power is generated inside the generator 120 by the rotation of the rotating shaft 122.

The power generated by the power generation unit 120 charges one or more batteries included in the energy storage unit 160 .

The auxiliary power generator 130 receives power from the energy storage unit 160 when the rotational speed of the renewable energy generation module 110 is low, and generates auxiliary power for increasing the rotational speed of the power generation module 110. .

Auxiliary power generated by the auxiliary power generating unit 130 may be transmitted to the rotating shaft 122 of the power generation unit 120 through the rotational force transmission unit 140 .

In one embodiment, the rotational speed of the generator 120 may be adjusted to a speed capable of producing maximum power by the auxiliary power generated by the auxiliary power generator 130 .

The control unit 150 checks the rotational speed of the power generation unit 120, and when the rotational speed of the power generation unit 120 is below a certain standard, the energy storage unit 160 supplies power to the auxiliary power generation unit 130. Control. In addition, the control unit 150 may control the rotational speed of the auxiliary power generator 130 to match the rotational speed of the generator 120 to a speed capable of producing maximum power.

In other words, the control unit 150 may perform MPPT (Maximum Power Point Tracking) control on the power generation unit 120 .

As described above, since the small power generation system 100 according to an embodiment generates power using renewable energy, it is possible to generate power in an environmentally friendly manner.

2 is a configuration diagram of a compact power generation system according to another embodiment.

Referring to FIG. 2 , a small power generation system 200 according to another embodiment includes a renewable energy generator 210, a DC (Direct Current) / DC converter 220, a generated power storage unit 230, and a flywheel energy storage unit. A unit 240 and a control unit 250 may be included. In addition, an inverter 260, a first switch 272, a second switch 274, and a third switch 276 may be further included.

Renewable energy generator 210 may include one or more of a small photovoltaic power generation module, a small wind power generation module, and a small hydropower module. Here, the small photovoltaic power generation module may include one or more solar cell panels, and the small wind power generation module may include one or more wind turbines. In addition, the small-sized hydroelectric power generation module may include one or more hydroelectric turbines.

The DC/DC converter 220 may receive DC generated power from the renewable energy generator 210 . In addition, under the control of the control unit 250 to be described later, the DC generated power may be converted into battery charging power or converted into first motor driving power.

In addition, the DC / DC converter 220 may generate generation power amount information of the renewable energy generator 210 and output it to the control unit 250.

The generated power storage unit 230 includes one or more batteries, and receives battery charging power from the DC/DC converter 220 to charge one or more batteries.

Also, the generated power storage unit 230 may output power discharged from one or more batteries to the inverter 160 .

In one embodiment, the generated power storage unit 230 may include a battery management system (BMS). Through this, the generated power storage unit 230 may output SOC (State Of Charge) information of one or more batteries to the control unit 250 .

If the SOC information of one or more batteries in the generated power storage unit 230 exceeds the reference charging amount, the generated power storage unit 230 transfers the second motor driving power, which is the power discharged from the one or more batteries, to the flywheel energy storage unit 240. can also be printed out.

The flywheel energy storage unit 240 may receive first motor driving power from the DC/DC converter 220, convert the first motor driving power into first rotational kinetic energy, and store the first rotational kinetic energy.

Also, the flywheel energy storage unit 240 may receive second motor driving power from the generated power storage unit 230, convert the second motor driving power into second rotational kinetic energy, and store the second rotational kinetic energy.

The flywheel energy storage unit 240 may include an electric motor 242 , a first rotating body 244 , a second rotating body 246 , and a combined electric motor 248 .

The electric motor 242 may be driven by receiving the first motor driving power.

One or more permanent magnets are attached to one surface of the first rotating body 244, and the other surface may be coupled with the electric motor 242. When the first rotating body 244 is a circular plate material, one or more permanent magnets may be attached along the inside of the rim of the first rotating body 244 . Here, one or more permanent magnets may be alternately attached to N poles and S poles.

The first rotating body 244 may rotate by driving the electric motor 242 to convert first motor driving power into first rotational kinetic energy and store it.

The second rotating body 246 is arranged such that one surface faces the first rotating body 244, and when the first rotating body 244 rotates, by a permanent magnet attached to the first rotating body 244. It can rotate like the first rotating body 244 by the generated magnetic field. Here, one or more permanent magnets may be attached to one surface of the second rotating body 246 . When the second rotating body 246 is a circular plate material, one or more permanent magnets may be attached along the inner side of the rim of the second rotating body 246 . Here, one or more permanent magnets may be alternately attached to N poles and S poles.

A magnetic field is formed between one surface of the first rotating body 244 and one surface of the second rotating body 246 in permanent magnets attached to one surface of the first rotating body 244 and one surface of the second rotating body 246 , When the first rotating body 244 and the second rotating body 246 rotate, magnetic force (repulsive force) of opposite polarity or magnetic force (attractive force) of the same polarity is generated in the magnetic field, so that the first rotating body 244 ) And the first rotational kinetic energy or the second rotational kinetic energy stored in one or more of the second rotating body 246 can be stored for a long period of time.

The combined electric motor 248 may be coupled to the other surface of the second rotating body 246 .

In one embodiment, when the generated power amount information is less than the reference power amount and the SOC information is less than the reference charge amount, the generator combined electric motor 248 converts the first rotational kinetic energy stored in the first rotation body 244 to the second rotation body 246 ) and can be driven as a generator. Through this, it is possible to generate battery charging power. In addition, the combined electric motor 248 may output battery charging power to the generated power storage unit 230 .

The controller 250 may perform MPPT (Maximum Power Point Tracking) control for the renewable energy generator 210 .

Also, the control unit 250 may supply power to the load 10 by controlling the generated power storage unit 230 and the inverter 260 .

In an embodiment, the control unit 250 may receive generated power amount information from the DC/DC converter 220 and state of charge (SOC) information on one or more batteries from the generated power storage unit 230 .

When the generated power amount information is equal to or greater than the reference amount of power and the SOC information is equal to or less than the reference charge amount, the controller 250 may control the DC/DC converter 220 to convert the DC generated power into battery charging power.

A detailed explanation of this is given below.

3 is a flowchart illustrating a process of charging DC generated power to a generated power storage unit in a small power generation system according to an embodiment.

The controller 250 may pre-store a reference power amount and a reference charging amount. Here, the reference power amount may be the lowest threshold value for determining whether the renewable energy generator 210 is normally generating power, and the reference charge amount may be the maximum charge amount of the generated power storage unit 230.

When the generated power information received from the DC/DC converter 220 is equal to or greater than the reference amount of power and the SOC information received from the generated power storage unit 230 is equal to or less than the reference charge amount, the control unit 250 turns the first switch 272 ON. , so that the first switch 272 connects the first power transmission path (S310 and S320). Here, the first power transmission path may refer to a power transmission path between the DC/DC converter 220 and the generated power storage unit 230, and the first switch 272 may connect or disconnect the first power transmission path. there is.

When the first switch 272 is turned on, the control unit 250 may turn off the second switch 274 so that the second switch 274 blocks the second power transmission path (S330). Here, the second power transmission path may mean a power transmission path between the DC/DC converter 220 and the flywheel energy storage unit 240 . In other words, it may mean a power transmission path between the DC/DC converter 220 and the electric motor 242 of the flywheel energy storage unit 240. The second switch 274 may connect or disconnect the second power transmission path.

Through the same process as shown in FIG. 2 , the small power generation system 200 can charge the generated power storage unit 230 whose SOC is less than or equal to the maximum charging amount. Here, the third switch 276 for connecting or disconnecting the third power transmission path between the generator combined electric motor 248 of the flywheel energy storage unit 240 and the generated power storage unit 230 is maintained in an OFF state, that is, the third switch 276 is turned off. 3The power transmission path may be in a blocked state.

Meanwhile, the control unit 250 may control the DC/DC converter 220 to convert the DC generated power into the first motor driving power when the generated power amount information is equal to or greater than the reference amount of power and the SOC information exceeds the reference charge amount.

A detailed explanation of this is given below.

4 is a flowchart illustrating a process of storing DC generated power in a flywheel energy storage unit in a small power generation system according to an embodiment.

When the generated power information received from the DC/DC converter 220 is equal to or greater than the reference amount of power and the SOC information received from the generated power storage unit 230 exceeds the reference charging amount, the control unit 250 switches the first switch 272. By turning OFF, the first switch 272 can block the first power transmission path (S410 and S420).

When the first switch 272 is turned off, the controller 250 may turn on the second switch 274 so that the second switch 274 connects the second power transmission path (S430).

Through the same process as shown in FIG. 4, in the small power generation system 200, the flywheel energy storage unit 240 replaces the generated power storage unit 230 whose SOC exceeds the maximum charge amount, DC power generation of the renewable energy generator 210 can save power. In one embodiment, since the flywheel energy storage unit 240 can store DC generated power, an increase in the size or number of batteries in the generated power storage unit 230 can be minimized. Here, the third switch 276 may remain in an OFF state, that is, the third power transmission path may be blocked.

In one embodiment, the control unit 250 converts the first rotational kinetic energy into battery charging power in the flywheel energy storage unit 240 when the generated power amount information is less than the reference amount of power and the SOC information is less than or equal to the reference charge amount, and the generated power storage unit It can be controlled to output to (230).

A detailed description of the configuration for charging the generated power storage unit 2130 with the first rotational kinetic energy is as follows.

5 is a flowchart illustrating a process of charging a generated power storage unit with energy stored in a flywheel energy storage unit in a compact power generation system according to an embodiment.

When the generated power amount information received from the DC/DC converter 220 is less than the standard amount of power and the SOC information received from the generated power storage unit 130 is less than or equal to the standard charging amount, the control unit 250 switches between the first switch 272 and the first switch 272. By turning off the second switch, the first switch 272 can block the first power transmission path and the second switch 274 can block the second power transmission path (S510 and S520).

When the first switch 272 and the second switch are turned off, the control unit 250 turns on the third switch 276 so that the third switch 276 connects the third power transmission path (S530).

Through this, the generator-combined electric motor 248 receiving the first rotational kinetic energy stored in the first rotation body 244 through the second rotation body 246 is driven by a generator to generate battery charging power and generate electricity. Battery charging power may be output to the generated power storage unit 230 .

In one embodiment, the control unit 250 outputs the second motor driving power from the generated power storage unit 230 to the generator combined electric motor 248 when the generated power amount information is less than the reference amount of power and the SOC information exceeds the reference charge amount. In addition to controlling, the generator combined electric motor 248 may be controlled to receive and drive the second motor driving power. Here, the second motor driving power may be equal to or different from the first motor driving power.

A detailed description of the configuration for driving the generator combined electric motor 248 with the second motor driving power is as follows.

6 is a flowchart illustrating a process of storing power generated by a power storage unit in a flywheel energy storage unit in a small power generation system according to an exemplary embodiment.

When the generated power amount information received from the DC/DC converter 220 is less than the standard amount of power and the SOC information received from the generated power storage unit 230 exceeds the standard charging amount, the control unit 250 switches the second switch 274. By turning OFF, the second switch 274 can block the second power transmission path (S610 and S620). In step S620, the control unit 250 may also turn off the first switch 272.

When the second switch 274 is turned OFF, the control unit 250 controls the generated power storage unit 230 to output the second motor driving power, and turns the third switch 276 ON so that the third switch 276 is The third power transmission path may be connected (S630 and S640).

Through this, the generator combined electric motor 248 is driven by the electric motor, and the second rotating body 248 is rotated by the driving of the generator combined electric motor 248 to convert the second motor driving power into the second rotational kinetic energy. You can convert and save.

After the step S540, the control unit 250 may control to stop outputting the second motor driving power from the generated power storage unit 230 when the SOC information reaches the reference amount of charge (S650 and S660). In the step S660, the first switch 272, the second switch 274, and the third switch 276 may be turned OFF.

As described above, since the DC generated power generated by the renewable energy generator 210 is divided and stored in the generated power storage unit 230 and the flywheel energy storage unit 240, the size or quantity of batteries in a small power generation system can be reduced. The cost of increasing can be reduced.

Terms such as "comprise", "comprise" or "having" described above mean that the corresponding component may be inherent unless otherwise stated, and therefore do not exclude other components. It should be construed that it may further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the meaning in the context of the related art, and unless explicitly defined in the present invention, they are not interpreted in an optimal or excessively formal meaning.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (9)

A DC/DC converter that receives DC (Direct Current) generated power from a renewable energy generator and converts it into either battery charging power or first motor driving power;
a generated power storage unit including one or more batteries and receiving the battery charging power from the DC/DC converter to charge the one or more batteries;
a flywheel energy storage unit receiving the first motor driving power from the DC/DC converter, converting the first motor driving power into first rotational kinetic energy, and storing the first rotational kinetic energy; and
Receives generated power amount information from the DC/DC converter, receives SOC (State Of Charge) information for the one or more batteries from the first generated power storage unit, and when the generated power amount information is greater than or equal to a reference amount of power, the SOC information If is less than or equal to the reference charging amount, the DC/DC converter controls the DC generation power to be converted into the battery charging power, and if the generated power amount information is equal to or greater than the reference amount of power and the SOC information is greater than the reference charging amount, the DC/DC converter controls A control unit controlling the DC converter to convert the DC generated power into the first motor driving power.
A small power generation system comprising a. The method of claim 1, wherein the mini-power generation system
a first switch connecting or disconnecting a first power transmission path between the DC/DC converter and the generated power storage unit; and
Further comprising a second switch for connecting or disconnecting a second power transmission path between the DC / DC converter and the flywheel energy storage unit,
The control unit controls the first switch to connect the first power transmission path when the generated power amount information is equal to or greater than the reference amount of power and the SOC information is equal to or less than the reference charge amount, and the second switch controls the second power transmission path. Control to cut off the transmission path, and if the generated power amount information is equal to or greater than the reference amount of power and the SOC information exceeds the reference charging amount, the first switch controls to block the first power transmission path, and the second switch A small power generation system for controlling to connect the second power transmission path. According to claim 1,
The control unit controls the flywheel energy storage unit to convert the first rotational kinetic energy into battery charging power and output it to the generated power storage unit when the generated power amount information is less than the reference amount of power and the SOC information is less than or equal to the reference charging amount. small power generation system. According to claim 3,
The flywheel energy storage unit may include an electric motor that receives and drives the first motor driving power;
A first rotating body having one or more permanent magnets attached to one surface, coupled to the electric motor on the other surface, and rotating by driving the electric motor to convert the driving power of the first motor into the first rotational kinetic energy;
a second rotating body, one surface of which is disposed to face the first rotating body, and rotates together with the first rotating body by an attraction or a repulsive force generated by a magnetic field of the permanent magnet when the first rotating body rotates; and
coupled to the other surface of the second rotating body, and when the generated power amount information is less than the reference amount of power and the SOC information is less than or equal to the reference charging amount, the first rotational kinetic energy stored in the first rotating body is converted into the second rotational power amount. A generator combined electric motor that receives power through the whole, generates the battery charging power, and outputs the battery charging power to the generated power storage unit.
A small power generation system comprising a. According to claim 4,
If the generated power amount information is less than the reference amount of power and the SOC information is greater than the reference charge amount, the controller generates second motor driving power (the second motor driving power is equal to the first motor driving power) in the generated power storage unit. or other value) to the generator combined electric motor and control the generator combined electric motor to receive and drive the second motor driving power. According to claim 5,
The second rotating body is rotated by the driving of the generator-combined electric motor to convert the second motor driving power into second rotational kinetic energy, and the control unit stores the generated power when the SOC information reaches the reference charging amount. A small power generation system for controlling a control unit to stop outputting the second motor driving power. According to claim 6,
a first switch connecting or disconnecting a first power transmission path between the DC/DC converter and the generated power storage unit;
a second switch connecting or disconnecting a second power transmission path between the DC/DC converter and the electric motor; and
A third switch for connecting or disconnecting a third power transmission path between the generator combined electric motor and the generated power storage unit
A small power generation system further comprising a. According to claim 7,
When the generated power amount information is less than the reference amount of power and the SOC information is less than or equal to the reference charge amount, the controller blocks the first power transmission path and the second switch blocks the second power transmission path. In addition to controlling to do so, the third switch controls to connect the third power transmission path. According to claim 7,
The control unit controls the second switch to block the second power transmission path when the generated power amount information is less than the reference amount of power and the SOC information exceeds the reference charge amount, and the third switch controls the third power amount A small power generation system that controls transmission paths to be connected.

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