KR102512710B1 - Movable Charging station Connected New Regeneration Energy and charging station management system - Google Patents

Abstract

The present invention provides a renewable energy-linked electric vehicle charging system comprising: an electric vehicle charging unit that charges an electric vehicle; a first power supply unit that supplies power generated based on hydrogen fuel to the electric vehicle charging unit; a second power supply unit that supplies power generated based on solar energy to the electric vehicle charging unit; a power distribution unit that is connected to a commercial power grid and connects and supplies commercial power when the power supply from the first power supply unit and the second power supply unit is less than the amount of power required by the electric vehicle charging unit; and an energy storage unit that is linked to the power distribution unit, stores surplus power generated by the first power supply unit and the second power supply unit, and provides the surplus power to the electric vehicle charging unit depending on the charging demand of the electric vehicle. Accordingly, it is possible to achieve zero carbon emissions by charging an electric vehicle using renewable energy sources.

Description

Movable Charging station Connected New Regeneration Energy and charging station management system}

The present invention relates to an operation and management system for an electric vehicle charging station connected to new and renewable energy, and more specifically, to an electric vehicle charging station based on convergence new and renewable energy (hydrogen fuel cell/solar light/wind power/ESS).

Since electric vehicles (EVs) are linked to the grid for charging, as the number of electric vehicles increases, the load applied to the grid also increases. If several electric vehicles are charged simultaneously, the total load increases rapidly. It is known that in order to improve the reliability of the system, it is necessary to analyze the system impact of the rapid increase in electric vehicle charging demand and to expand the transmission and distribution network in preparation for power demand.

Therefore, a method to maintain stability by improving the reliability of the power system must be prepared, and a distributed power system for charging electric vehicle loads is required as one of the methods.

Various EV charging load distribution scenarios or simulations are being studied, but they are not effective.

On the other hand, in order to distribute the electric vehicle charging demand, a plan to connect with new and renewable energy is being studied together. At this time, in order to use a renewable energy source, the installation of an energy storage device (ESS, Energy Storage System) may be required.

Therefore, there is a need for safe and efficient management of energy storage devices provided in charging stations while effectively distributing electric vehicle charging demands.

Conventional technologies for "optimal demand management method using an electric vehicle" suggest a method of controlling scheduling in preparation for a time of high demand and performing charge/discharge control by predicting demand. However, these prior arts do not solve the fundamental problem of demand distribution.

On the other hand, there are various prior arts to control the voltage balancing of the battery rack provided in the energy storage device.

For example, a method of independently controlling each battery rack by connecting them in series with a power conversion device, a passive balancing method in which balancing is performed in consideration of cell capacity in a battery rack, and a method of selectively controlling a charge/discharge path using a precharge path. method, etc.

However, these voltage balancing methods have disadvantages such as requiring too much switching control or requiring large resources for voltage balancing.

In addition, the method of performing voltage balancing through control of a plurality of load banks and load bank relays in order to overcome the disadvantages of the prior art also has a complicated system structure and still consumes a lot of resources for individual control of the battery rack. there is

In addition, the prior art has a disadvantage in that compatibility with existing battery rack systems is not considered, and imbalance due to differences in capacity and performance of each manufacturer, battery cell or battery pack cannot be considered.

Republic of Korea Patent Publication No. 10-2020-0113633 Publication date October 07, 2020

An object of the present invention is to provide a more eco-friendly electric vehicle charging system using a water electrolysis device that produces hydrogen and a fuel cell generator that produces power.

In order to achieve the above object, a renewable energy-linked electric vehicle charging system according to an embodiment of the present invention includes an electric vehicle charging unit for charging an electric vehicle; a first power supply unit supplying electric power generated based on hydrogen fuel to the electric vehicle charging unit; a second power supply unit supplying power generated based on sunlight to the electric vehicle charging unit; a power receiving and distribution unit that is connected to a commercial power grid and connects and supplies commercial power when the amount of power supplied by the first power supply unit and the second power supply unit is less than the amount of power required by the electric vehicle charging unit; and an energy storage unit connected to the power receiving and distributing unit, which stores surplus power generated by the first power supply unit and the second power supply unit and supplies the surplus power to the electric vehicle charging unit according to a charging demand of the electric vehicle.

At this time, the first power supply unit, a hydrogen generator for extracting hydrogen through a catalytic reaction to a compound in the form of a pellet containing hydrogen; and a fuel cell generating power using hydrogen supplied from the hydrogen generation module.

At this time, the first power supply unit, a gas tank for storing hydrogen in a gaseous state; and a hydrogen supply controller selectively supplying hydrogen generated from the hydrogen generator or stored in the gas tank to the fuel cell according to power generation conditions.

In addition, the hydrogen generator, a pellet cartridge module for accommodating a hydrogen compound in the form of pellets; a chamber module extracting hydrogen by performing a catalytic reaction on the hydrogen compound; And it may include a withdrawal module for withdrawing the hydrogen compound in the form of pellets from the pellet cartridge module at a controlled rate and introducing it into the chamber module.

On the other hand, the chamber module, a plurality of cylinders for generating hydrogen by receiving the pellets; a drawing pipe for withdrawing hydrogen generated in the cylinder at all times; And it may include a piston for discharging the reaction-completed pellet residue from the cylinder in which hydrogen generation is completed.

In addition, N cylinders (where N is 3 to 10) are arranged in a circular shape, and the chamber module is configured to discharge the pellet residues at the first position where the N cylinders are input to the pellets. It is preferable to further include a rotator for sequentially moving the piston to an Nth position, and the drawing pipe is disposed at a central portion of the rotator and rotates at the same speed as the rotator.

In addition, the cylinder may include a discharge pipe protruding in a lateral direction of the circumferential surface and connected to the withdrawal pipe; a top cover that is hingedly fixed to an upper end of the circumferential surface and selectively opens an upper portion of the cylinder; and a lower cover fixed to a lower end of the circumferential surface in a hinged manner to selectively open a lower portion of the cylinder.

At this time, the take-out pipe, a collection pipe connected to the discharge pipe of each cylinder in a circular shape; and a control valve provided at a portion connected to the collection pipe and the discharge pipe of the cylinder to prevent outflow of hydrogen gas due to reverse flow.

According to the renewable energy-linked electric vehicle charging system according to the present invention,

First, it is possible to achieve zero carbon emissions by charging electric vehicles using renewable energy sources.

Second, it is unnecessary to expand the national transmission and distribution network by using distributed power sources.

Third, it is possible to utilize emergency power through ESS (Energy Storage System) in case of power system blackout.

1 is a block diagram of a renewable energy-linked electric vehicle charging system according to an embodiment of the present invention.
2 is a block diagram of a first power supply unit according to an embodiment.
3 is a schematic diagram of a hydrogen generator according to an embodiment.
4 is a perspective view of a chamber module according to one embodiment.
5 explains the open state of the cylinder.
6 explains the closed state of the cylinder.
7 is a diagram schematically illustrating the operation according to each position of the chamber module in a linear form.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. At this time, it should be noted that in the accompanying drawings, the same components are indicated by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated.

1 is a block diagram of a renewable energy-linked electric vehicle charging system according to an embodiment of the present invention. The renewable energy-linked electric vehicle charging system (S) according to the present invention includes an electric vehicle charging unit (A), a first power supply unit (B), a second power supply unit (C), a power receiving unit (D) and an energy storage unit (E). includes

An electric vehicle charging unit (A) is a device for charging an electric vehicle, and may be selected from a low-speed charger or a high-speed charger according to implementation conditions. As the electric vehicle charging unit (A), a commercially available product may be used.

The first power supply unit (B) is a device that supplies electricity generated based on hydrogen fuel to the electric vehicle charging unit (A). The first power supply unit B may use a hydrogen fuel cell type.

The second power supply unit (C) is a device that supplies electricity generated based on sunlight to the electric vehicle charging unit (A). The second power supply unit (C) may be a photovoltaic power generation facility that generates power through a solar cell panel. The second power supply unit C may be in charge of supplying main power in an area with less spatial restrictions and favorable daylight conditions, such as a golf course.

In places where space constraints and sunlight conditions are unfavorable, the renewable energy-linked electric vehicle charging system (S) of the present invention may be implemented in a form equipped with only the first power supply unit (B), excluding the second power supply unit (C). .

The receiving and distributing unit (D) is connected to the existing commercial power grid, and when the amount of power supplied by the first power supply unit (B) and the second power supply unit (C) is less than the amount of power required by the electric vehicle charging unit (A), commercial Power is connected and supplied.

When the amount of power supplied by the first power supply unit (B) and the second power supply unit (C) exceeds the amount of power required by the electric vehicle charging unit (A), the power receiving and distributing unit (D) generates the excess power through the existing commercial power grid. can sell

The energy storage unit (E) is connected to the power receiving and distributing unit (D) and stores surplus power generated by the first power supply unit (B) and the second power supply unit (C). Alternatively, according to the operating conditions of the system (S), low-cost late-night power from the existing commercial power grid can be used to store power in the energy storage unit (E) and use it according to the demand of the electric vehicle charging unit (A).

In addition to the drawings, the renewable energy-linked electric vehicle charging system (S) according to the present invention may further include a cost processing server (not shown) responsible for billing processing according to the use of the electric vehicle charger (A).

In the electric vehicle charging system (S) of the present invention, the second power supply unit (C), the power receiving and distribution unit (D), and the energy storage unit (E) can be configured using existing commercial devices, so the first power supply unit (B) I will mainly explain in detail.

2 is a block diagram of a first power supply unit according to an embodiment. Referring to FIG. 2 , the first power supply unit B includes a gas tank T, a hydrogen generator 1000, a hydrogen supply regulator 2000, and a fuel cell 3000.

The gas tank T stores hydrogen in a gaseous state. The gas tank (T) has a high-pressure spring type. The hydrogen generator 1000 extracts hydrogen through a catalyst half to a compound in the form of pellets containing hydrogen. Although it has been explained that hydrogen is extracted, terms such as hydrogen extraction, hydrogen generation reaction, and hydrogen generation reaction will be used appropriately for better understanding.

The hydrogen generator 1000 uses chemical hydride, and sodium borohydride (NaBH4) may be exemplified as a pellet-type compound containing hydrogen.

Sodium borohydride (NaBH4) may be compressed to form a solid of a predetermined size, and in the present invention, it will be referred to as a pellet (P) for convenience of explanation.

The hydrogen supply controller 2000 selectively supplies hydrogen generated in the hydrogen generator 1000 or hydrogen stored in the gas tank T to the fuel cell 3000 according to power generation conditions. For example, when the hydrogen generator 1000 is inspected or the pellets P are replenished, power can be generated only with hydrogen supplied from the gas tank T.

The fuel cell 3000 generates power by receiving hydrogen from the gas tank T or the hydrogen generator 1000 . Depending on installation conditions, implementation environment, etc., the first power supply unit (B) may be implemented in a form without a gas tank (T).

3 is a schematic diagram of a hydrogen generator according to an embodiment.

Referring to Figure 3, the hydrogen generator 1000 according to an embodiment includes a pellet cartridge module 100, a withdrawal module 200 and a chamber module 300.

The pellet cartridge module 100 accommodates a pellet P formed of sodium borohydride (NaBH4). Replenishment of the pallet (P) is easily possible by replacing the pellet cartridge module (100).

The chamber module 300 extracts hydrogen by catalyzing a hydrogen compound.

The withdrawal module 200 withdraws a hydrogen compound in the form of pellets (ie, pellets P) at a controlled speed from the pellet cartridge module 100 and introduces them into the chamber module 300.

In this embodiment, the hydrogen generator 1000 further includes a catalyst cartridge module 100' accommodating the catalyst P' and a catalyst withdrawal module 200'.

The catalyst extraction module 200' withdraws the catalyst P' from the catalyst cartridge module 100' at a controlled speed and puts it into the chamber module 300. In a situation where high output is required, the input amount is adjusted by increasing the ratio of the catalyst (P') to the pallet (P).

In the illustrated example, the take-out module 200 and the catalyst take-out module 200' are shown in the form of a conveyor belt, but this is a schematic form for ease of understanding. The take-out module 200 and the catalyst take-out module 200' may be implemented in the form of a conveyor belt or in the form of an inclined slope and may be implemented in a vibration-based transport method.

Although omitted for concise illustration, a water supply module (not shown) for hydrolysis of the pellets P is further disposed.

4 is a perspective view of a chamber module according to an embodiment, FIG. 5 is a view for explaining an open state of a cylinder, FIG. 6 is a view for explaining a closed state of a cylinder, and FIG. 7 is a view for each position of the chamber module. It is a drawing modeled in the form of a straight line.

Referring to FIGS. 4 to 7 , a chamber module 300 according to an embodiment includes a cylinder 310 , a lead pipe 320 , a rotator 330 and a piston 340 .

The cylinder 310 is a container for generating hydrogen by receiving the pellets P. Hydrolysis of the pellets P by the catalyst generates hydrogen. Waste heat is generated when hydrolysis occurs, and the waste heat generated in the chamber module 300 can be supplied to a place requiring heat, such as a smart farm.

The withdrawal pipe 320 is connected to the cylinders 310 and withdraws hydrogen generated in each cylinder 310 and supplies the hydrogen generated to the fuel cell 3000 through the hydrogen supply controller 2000 .

A plurality of cylinders 310 are arranged in a circular shape. Depending on the size of the chamber module 300, 3 to 10 cylinders 310 may be provided. A plurality of cylinders 310 are arranged in a circular shape. 4 shows an embodiment in which six cylinders 310 are provided. For convenience of explanation, the identification codes of each cylinder will be classified as '310-1', '310-2', and '310-6'.

Each of the cylinders 310-1, 310-2, .., 310-6 is moved to the first position (#1), the second position (#2), .., and the sixth position (#6) by the rotator 330. are sequentially moved to In FIG. 5 , the rotator 330 is shown in the form of a holder into which the cylinder 310 is inserted, but this is an embodiment for facilitating understanding and may be modified into an appropriate form according to the shape of the cylinder.

The cylinder 310 will be described in detail with reference to FIG. 5 .

The cylinder 310 includes a cylinder body 314, an upper cover 312, a lower cover 313, a discharge pipe 311, an upper hinge 315 and a lower hinge 316.

The cylinder body 314 has a cylindrical shape, and the discharge pipe 311 is disposed in a protruding form in a lateral direction (ie, a side surface) of the circumferential surface of the cylinder body 314 and is connected to the take-out pipe 320. The discharge pipe 311 has an L shape and is disposed adjacent to the upper end of the cylinder body 314.

The top cover 312 is fixed to the top of the cylinder body 314 through the top hinge 315 in a hinged opening/closing manner. The top of the cylinder 310 is selectively opened by the top cover 312 .

The lower cover 313 is fixed to the lower end of the cylinder body 314 through the lower hinge 316 in a hinged opening/closing manner. The lower part of the cylinder 310 is selectively opened by the lower cover 313.

The top cover 312 and the bottom cover 313 each have a sealing/locking structure to prevent outflow of generated hydrogen. The illustrated form is a typical form for helping understanding of the sealing structure.

Referring to FIG. 7, each cylinder is sequentially moved to the first position (#1), the second position (#2) ..., and the sixth position (#6) by the rotator 330, and the operation performed will be described. would.

The first position (#1) is a position where the pellets (P) and the catalyst (P') are injected into the cylinder (310-1) at the corresponding position. The take-out module 200 and the catalyst take-out module 200' are disposed to be in contact with the cylinder 310 at the first position (#1), and input the pellets P and the catalyst P'. In the first position (#1), the top cover 312 is in an open state. A cover opening/closing device for automatically opening/closing the top cover 312 is further provided, but the corresponding device is omitted for concise illustration. When the pellets P and the catalyst P' are completely injected, the top cover 312 is closed and the cylinder 310-1 is moved to the second position #2 by the rotator 330. While moving from the second position (#2) to the fifth position (#5), a hydrogen release reaction is performed in the cylinder 310-1, and the released hydrogen is collected through the take-out pipe 340 located in the central part of each cylinder. lose

Referring to FIG. 5 , the take-out pipe 320 is disposed at the center of the rotator 330 and rotates at the same speed as the rotator 330 . Specifically, the take-out pipe 320 includes a sunflower-shaped collecting pipe 324 connected to the discharge pipe 311 of each cylinder, a L-shaped bend pipe 322 connected to the hydrogen supply regulator 2000, and a sealed connection part 323 .

The sunflower-shaped collecting pipe 324 is disposed in the central portion of the rotator 330 and rotates, and the L-shaped bend pipe 322 is in a fixed form. The sealed connection part 323 is a part that allows the collecting pipe 324 to rotate with respect to the L-shaped bend pipe 322.

Through the structure of the take-out pipe 320, the cylinder 310-1 can continuously discharge hydrogen while moving from the second position (#2) to the fifth position (#5).

The cylinder 310-1 is sequentially moved from the second position (#2) to the fifth position (#5) according to the time when the hydrogen evolution reaction ends.

The piston 340 discharges the reaction-completed pellet residue Z from the hydrogen generation cylinder, and is disposed at the sixth position #6 in the illustrated example. When the cylinder 310-1 reaches the sixth position (#6), the top cover 312 and the bottom cover 313 are opened, and the piston 340 is lowered to pass through the cylinder 310-1 so that the reaction takes place. The remainder (Z) of the completed pellets (P) is discharged. Below the sixth position (#6), a collection device such as a hopper for recovering the residue (Z) is disposed (not shown for brevity).

Since the cylinder 310 is open at the sixth position (#6) and the first position (#1), hydrogen generated from the cylinders located at the second position (#2) and the fifth position (#5) flows backward and flows out. It can be. In order to prevent this problem, it is preferable that the sunflower-shaped collecting pipe 324 includes a control valve 325 at a portion connected to each discharge pipe 311 to prevent a reverse flow of hydrogen water.

The control valve 325 is operated at the sixth position (#6) and the first position (#1) to prevent outflow of hydrogen due to reverse flow.

As described above, since the hydrogen generator 1000 according to this embodiment is sequentially performed in the plurality of cylinders 310, the input of the pellets P, the generation of hydrogen, and the discharge of the residue, it is possible to continuously generate hydrogen.

Embodiments of the present invention disclosed in this specification and drawings are only presented as specific examples to easily explain the technical content of the present invention and help understanding of the present invention, and are not intended to limit the scope of the present invention. It is obvious to those skilled in the art that other modified examples based on the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein.

S: Renewable energy-linked electric vehicle charging system
A: charging unit B: first power supply unit
C: 2nd power supply unit D: power receiving and distribution unit
E: energy storage
P: chemical hydride pellets, P': catalysts and additives
1000: hydrogen generator
100: pellet cartridge module 200: withdrawal module
300: chamber module

Claims (8)

An electric vehicle charging unit for charging an electric vehicle;
a first power supply unit supplying electric power generated based on hydrogen fuel to the electric vehicle charging unit;
a second power supply unit supplying power generated based on sunlight to the electric vehicle charging unit;
a power receiving and distribution unit that is connected to a commercial power grid and connects and supplies commercial power when the amount of power supplied by the first power supply unit and the second power supply unit is less than the amount of power required by the electric vehicle charging unit; and
An energy storage unit connected to the power receiving and distributing unit, storing surplus power generated by the first power supply unit and the second power supply unit and supplying the surplus power to the electric vehicle charging unit according to a charging demand of the electric vehicle;
The first power supply unit,
A hydrogen generator for extracting hydrogen through a catalytic reaction to a pellet-type compound containing hydrogen; and
A fuel cell that generates power using hydrogen supplied from the hydrogen generator;
The first power supply unit,
a gas tank for storing gaseous hydrogen; and
Further comprising a hydrogen supply regulator for selectively supplying hydrogen generated in the hydrogen generator or stored in the gas tank to the fuel cell according to power generation conditions;
The hydrogen generator,
A pellet cartridge module for accommodating a hydrogen compound in pellet form;
a chamber module extracting hydrogen by performing a catalytic reaction on the hydrogen compound; and
And a withdrawal module for withdrawing the hydrogen compound in the form of pellets from the pellet cartridge module at a controlled speed and introducing it into the chamber module,
The chamber module,
A plurality of cylinders for receiving the pellets and generating hydrogen;
a drawing pipe for withdrawing hydrogen generated in the cylinder at all times; and
Including a piston for discharging the reaction completed pellet residue from the hydrogen generation cylinder,
The cylinders are N (where N is 3 to 10) arranged in a circular shape,
The chamber module,
Further comprising a rotator for sequentially moving the N cylinders from a first position for receiving the pellets to an N-th position for discharging the remaining pellets,
The withdrawal pipe,
Renewable energy-linked electric vehicle charging system, characterized in that disposed in the center of the rotator and rotates at the same speed as the rotator. delete delete delete delete delete The method of claim 1,
the cylinder,
a discharge pipe protruding in the lateral direction of the circumferential surface and connected to the withdrawal pipe;
a top cover that is hingedly fixed to an upper end of the circumferential surface and selectively opens an upper portion of the cylinder; and
Renewable energy-linked electric vehicle charging system, characterized in that it comprises a lower cover fixed to the lower end of the circumferential surface in the form of a hinge and selectively opening the lower part of the cylinder. The method of claim 7,
The withdrawal pipe,
A collection tube connected to the discharge tube of each cylinder in a circular shape; and
Renewable energy-linked electric vehicle charging system, characterized in that it comprises a control valve provided at a portion connected to the collection pipe and the discharge pipe of the cylinder to prevent outflow of hydrogen gas due to reverse flow.

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