KR20230094202A - Electric vehicle charging system for both solar and grid power - Google Patents

Abstract

The present invention relates to an electric vehicle charging system using both solar energy and grid power. More specifically, a battery unit is efficiently charged by using direct current power from solar power and late-night power from the system such that operating costs are reduced. A canopy where an energy storage unit, a charger, and a solar panel are installed can be formed to be fit to a small space such that space utilization is maximized. Modules within the energy storage unit are received in a single building such that maintenance of the system is simplified and effective response is possible in the event of a fire. In addition, all stages from power reception to charging are integrally operated and managed such that optimal efficiency is provided. The electric vehicle charging system comprises a solar panel, grid power, an energy storage, a quick charger, and a slow charger.

Description

Electric vehicle charging system for both solar and grid power}

The present invention relates to a charging system for an electric vehicle that combines solar power and system power. More specifically, it reduces operating costs by efficiently charging and using the battery unit by using direct current power from sunlight and at the same time using late-night power of the system. In addition, the canopy where the energy storage unit, charger, and solar panel are installed is formed to fit a small space, maximizing space utilization, and storing the modules in a single building within the energy storage unit to simplify system maintenance and fire prevention. It is about an electric vehicle charging system that can be effectively dealt with in the event of an occurrence and that can demonstrate optimal efficiency by integrating operation and management of all stages from power supply to charging.

In general, currently, automobile manufacturing is rapidly changing from an internal combustion engine to an electric vehicle due to climate change.

More specifically, as a result of the depletion of fossil fuels and climate change that causes the earth's temperature to rise, the use of eco-friendly energy has emerged due to the eco-friendly request that does not generate carbon dioxide, and the spread of electric vehicles is expanding. Although the spread of electric vehicle chargers for charging electric vehicles is also expanding, the penetration rate of electric vehicle charging infrastructure is still low compared to the penetration rate of electric vehicles.

In other words, a hybrid vehicle, which is an intermediate stage between an electric vehicle or an internal combustion engine and an electric vehicle, is a vehicle that obtains driving energy from electric energy, unlike existing internal combustion engine vehicles that obtain driving energy from burning fossil fuels. An electric motor as a driving source of the electric motor, a motor controller (MCU) for driving and controlling the electric motor, a battery for supplying driving power to the electric motor as an in-vehicle electric energy storage device, and an in-vehicle charging device (power conversion) for charging the battery unit, etc.), a charging port (Inlet, connector) for connection between the vehicle and an external charger, etc., and a high-capacity high-voltage battery is used to ensure sufficient mileage for one charge, , Recently, the use of lithium-ion batteries has become a trend.

However, compared to the increased speed of electric vehicles, the supply of charging systems for charging electric vehicles is much later than that of electric vehicles, and electric vehicle charging systems that mainly use system energy have become popular, There is a problem that the use of photovoltaic power generation is eliminated, or that different types of electricity are used in an electric vehicle charging system using only solar power generation alone or in parallel with a system.

Registered Patent Publication No. 10-1864197 (registration date: May 29, 2018) "Electric vehicle charging system and method for controlling the electric vehicle charging system"

An object of the present invention is to solve this problem, to reduce operating costs by efficiently charging and using the battery unit by using the direct current power of sunlight and at the same time by using the late-night power of the system, and by using the energy storage unit and the charger The canopy where the solar panel is installed is formed to fit into a small space, maximizing space utilization, and by storing different types of modules such as PSC and battery in the energy storage unit in a single building, it is easy to maintain and maintain the system. It is to provide an electric vehicle charging system that can effectively cope with a fire and achieve optimal efficiency by operating and managing all stages from faucet to charging in an integrated manner.

This object of the present invention is a solar panel installed on a canopy that generates DC current and supplies AC power to a slow charger through an inverter, system power that supplies AC current to a slow charger, and the system power A PCS capable of stable 24-hour operation with a built-in DC connection part and an AC connection part connected to the solar panel, a battery part that charges and stores electricity supplied from the PCS, and converts the current supplied from the battery part or PCS into direct current A hybrid energy storage unit (ESS) including a DC converter supplied to the rapid charger, a plurality of rapid chargers supplying DC current supplied from the hybrid energy storage unit to the rapid charger, and the solar panel and system power It is achieved by the solar and grid power combined electric vehicle charging system according to the present invention including a plurality of slow chargers for slow charging by supplying alternating current in the.

The electric vehicle charging system for both solar and grid power according to the present invention generates DC current, supplies AC power to a slow charger through an inverter, supplies solar panels installed on the canopy, and AC current to a slow charger. A system power supply, a PCS with built-in DC connection and AC connection so that the system power and solar panel are connected and capable of stable 24-hour operation, and a battery unit that charges and stores electricity supplied from the PCS, and the battery unit or PCS A hybrid energy storage unit (ESS) including a DC converter for converting supplied current into DC, a plurality of rapid chargers supplying DC current supplied from the hybrid energy storage unit to a rapid charger, and the solar panel Including a plurality of slow chargers for slow charging by supplying alternating current from the system power supply, using direct current power from sunlight and at the same time using the system's late-night power to efficiently charge and use the battery unit to reduce operating costs, The canopy in which the energy storage unit, charger, and solar panel are installed is formed to fit a small space to maximize space utilization, and different types of modules such as PSC and battery unit are housed in a single building within the energy storage unit. It has excellent effects that make it easy to maintain and manage fire, effectively respond to fire, and operate and manage all stages from faucet to charging in an integrated manner, making it possible to exert optimal efficiency.

1 is a schematic configuration diagram of an electric vehicle charging system for both solar and grid power according to the present invention.
2 is a block diagram of an electric vehicle charging system for both solar and system power according to a first embodiment of the present invention.
Figure 3 is a photo of the interior of the energy storage of the solar and system power combined electric vehicle charging system according to the first embodiment of the present invention
4 is a front and perspective view of a PCS installed inside an energy storage of an electric vehicle charging system for both solar and grid power according to a first embodiment of the present invention;
5 is a front view of a battery unit installed inside an energy storage of an electric vehicle charging system for both solar and grid power according to a first embodiment of the present invention.
6 is a structural diagram showing a schematic configuration of an electric vehicle charging system for both solar and grid power according to a first embodiment of the present invention.
7 is a schematic diagram showing an operation mode of an electric vehicle charging system for both solar and grid power according to a first embodiment of the present invention.

Schematically describing the electric vehicle charging system (A) for both solar and system power according to the present invention, as shown in FIG. The DC power generated from is supplied through an inverter, and some of this power is stored in the energy storage unit (ESS System) and some is supplied to a plurality of chargers installed in the electric vehicle charging station. As a structure managed by the integrated operation management system, system power and solar panel power can be used in common.

The solar and system power combined electric vehicle charging system (A) according to the present invention is green energy using sunlight and is suitable for the environment, and can use not only sunlight but also system power, so that ESG ( Environmental Social Governance), it is an intuitive integrated package with high efficiency, easy installation and low investment cost.

As shown in FIG. 2, the EV charging system (A) for both solar and grid power according to the first embodiment of the present invention generates DC current and supplies AC power to the slow charger (5) via the inverter (12). A solar panel 1 supplied to and installed on the canopy 11, a system power source 2 that supplies AC current to the slow charger 5, and the system power source 2 and the solar panel ( 1) A PCS that has a built-in DC connection and an AC connection so that stable 24-hour operation is possible, a battery unit that charges and stores electricity supplied from the PCS, and converts the current supplied from the battery unit or PCS into DC and the remaining current A hybrid energy storage unit (ESS) including a DC converter that is supplied to the battery unit is installed therein, and a rapid charger that supplies DC current supplied from the hybrid energy storage unit to a rapid charger ( 4) and a slow charger 5 for slowly charging by supplying AC current from the solar panel and grid power.

As shown in FIG. 2A, the solar and grid power combined electric vehicle charging system (A) has a structure in which one fast charger 4 is installed, two slow chargers 5 are installed, and four parking surfaces are installed. And, as shown in FIG. 2B, since two fast chargers 4 are installed, four slow chargers 5 are installed, and the increase or decrease of the installation area is possible, such as a structure in which eight parking surfaces are installed, This makes it possible to install it with optimal efficiency in space.

The energy storage 3 is a building like the container 3, and a hybrid energy storage unit (ESS) 30 is installed therein, and as shown in FIG. 3A, the hybrid energy storage unit (ESS) 30 A PCS 31 capable of stable 24-hour operation with a built-in DC connection and AC connection so that the system power source 2 and the solar panel 1 are connected, and a battery unit that charges and stores electricity supplied from the PCS (32) and a DC converter (33) for converting the current supplied from the battery unit or PCS into DC.

In addition, the energy storage 3 includes a distribution panel 34, a junction box 35, a firefighting equipment 36, and an HVAC 37 so that functions such as dustproofing, waterproofing, constant temperature/cooling, and fire prevention can be smoothly performed. ) is installed, the energy storage (3) is equipped with all related electrical modules, so it is easy to manage the integrated module, and functions such as dustproofing, waterproofing, constant temperature / cooling, and fireproofing are smoothly performed, so safety is ensured. It has a reinforced structure.

As shown in FIG. 3B, the firefighting equipment 36 of the energy storage 3 includes a housing 361 installed on the upper ceiling of the container 3a and a water heater installed on one side of the inside of the housing 361. It is installed on one side of the inside of the enclosure 361 at regular intervals from the storage tank 362 and the water storage tank 362, and is a protein foam extinguishing agent, a synthetic surfactant foam extinguishing agent, an aqueous film foam extinguishing agent, and a fluorinated protein cloth. A fire extinguishing agent storage tank 363 filled with one fire extinguishing agent selected from fire extinguishing agent and alcohol-resistant fire extinguishing agent, and installed inside the enclosure 361 at a predetermined interval from the fire extinguishing agent storage tank 363, each component A control unit 364 electrically connected to the control unit 364, a smoke sensor 365 connected to the control unit 364 and detecting smoke inside the container 3a according to a control signal of the control unit 364, and the control unit 364 ) connected to the heat sensor 366 for detecting the heat inside the container 3a according to the control signal of the control unit 364, and the fire extinguishing agent connected to the control unit 364 according to the control signal of the control unit 364 The solenoid valve 368 for sending the fire extinguishing agent stored in the storage tank 363 to the mixing unit 367 and the water stored in the water storage tank 362 connected to the control unit 364 according to the control signal of the control unit 364 It is configured to include a pump 369 for sending to the mixing unit 367, and a spray nozzle 400 for injecting a mixture of water and fire extinguishing agent in the mixing unit 367 to the outside.

When a fire occurs inside the container 3a through the configuration of the firefighting equipment 36 having the above configuration, when the smoke detection sensor 365 and the heat detection sensor 366 detect the occurrence of a fire, the pump through the control unit 364 By operating the 369 and the solenoid valve 368, the water accommodated in the water storage tank 362 and the fire extinguishing agent accommodated in the drug storage tank 363 are mixed in the mixing unit 367 and passed through the spray nozzle 400 into the container ( By spraying and foaming into the inside of 3a) and filling the inside of the container 3a in the form of foam, the fire is quickly extinguished using the suffocating effect.

Since the PCS 31 is operated based on the configuration of an industrial PLC and a drive stack, stable 24-hour operation is possible.

As shown in FIG. 4, the PCS 31 is efficiently and compactly manufactured with a DC connection part 31a and an AC connection part 31b provided on one panel at the bottom to reduce the space used, and the DC connection part A power control unit 31c is provided between 31a and the AC connection unit 31b. The DC connector 31a includes a DC power breaker and a DC power terminal block, the AC connector 31b includes an AC power breaker, an AC power terminal block, and a system power detection unit, and the power control unit 31c includes a control power breaker and a control power terminal block are included so that both DC and AC power can be used, and the system power source 2 can be conveniently installed with an inlet and outlet installed at the bottom. The PCS 31 has a structure in which a system control unit 31d is installed on the upper part to control the system.

That is, the PCS (31) is efficiently and compactly manufactured by reducing the use space by providing a DC connection part (31a) and an AC connection part (31b) on one panel at the bottom, and a system control unit (31d) is installed on the top Since it can control the system, it is manufactured in a small size, the manufacturing cost is low, the manufacturing is simple, and the system can be conveniently controlled during manufacturing.

The PCS(31) obtained the certification of the American safety standard 'UL1741' and passed the test to meet strict safety conditions for a total of 15 items such as maximum voltage, temperature saturation, withstand voltage, input/output power characteristics, and overload operation. And, the PCS (31) of the present invention can provide a safer PCS (31) by using a product that has obtained certification of the US safety standard 'UL1741'.

As shown in FIG. 5A, the battery unit 32 has a fire accident diffusion suppression function installed to prevent the spread of fire so that the battery unit 32 can be safely operated, and a BPU and BMS 32a are installed at the top. And, the battery module (32b) is installed at the bottom to collectively store all the modules in one rack to improve the space utilization rate. Since control is possible only by connection of a communication line (Modbus/TCP), the battery unit 32 suppresses fire spread and has a simple structure. The battery unit 32 obtained the certification of the US safety standard 'UL1741' for the function of suppressing the spread of fire accidents, and strict safety for a total of 15 items such as maximum voltage, temperature saturation, withstand voltage, input / output power characteristics, overload operation, etc. The test for whether to satisfy the conditions was passed, and the battery unit 32 of the present invention clearly performed the function of suppressing the spread of fire accidents by using a product that obtained certification of the US safety standard 'UL1741'.

Since the voltage of the electricity generated by the solar panel 1 is not constant in the DC converter 33, the voltage required for the battery unit 32 or the rapid charger 4 is supplied through the DC / DC switch installed inside, , The electric power generated by the solar panel 1 is passed through the electric vehicle charger 4, and the remaining electricity is recharged in the battery unit 32 again.

The operation of the solar and system power combined electric vehicle charging system (A) according to the present invention having such a configuration will be described in detail below.

As shown in FIG. 6, the solar and system power combined electric vehicle charging system (A) according to the present invention is a direct current generated by the solar panel (1) or an alternating current supplied by the system power source (2) Since both can be charged through the slow charger 5 or the rapid charger, it is very convenient to use.

That is, when trying to charge the electric vehicle (C) through the slow charger (5), the DC current of 300 ~ 800V generated from the solar panel (1) is generated from the solar panel (1) using AC current through the inverter (12), which is the AC power source. It is converted into AC 380V AC power to charge the electric vehicle (C), or the AC power supplied by the system power supply (2) is changed to AC 380V through the transformer (Sub TR) and the electric vehicle (C) is charged.

If you want to charge the electric vehicle (C) through the rapid charger (5), use DC current to convert the AC of the PCS (31) of the energy storage unit (30) or the DC stored in the battery unit (32) into a DC/DC converter It converts into DC 300~500V through and rapidly charges the electric vehicle (C).

Charging the battery unit 32 using the solar panel 1 is converted into AC 380V AC power through the inverter 12, and the generated power is charged in the battery unit 32 through the PCS 31. , Even in this way, when the charge amount of the battery unit 32 is insufficient, the battery unit 32 is charged through the PCS 31 using the late-night power of the system power supply 2 (shown in FIG. 7A ).

During the day, the discharge of the slow charger 5 converts the DC current of 300 to 800V generated from the solar panel 1 into AC power of 380V AC through the inverter 12, which is used for electric vehicle C. Supply and discharge is made, and at night, when the amount of charge in the battery unit 32 is sufficient, the power charged in the battery unit 32 is withdrawn through the PCS 31 and supplied through the slow charger 5 After discharging, and when the amount of charge in the battery unit 32 is insufficient, the late-night power supplied from the system power source 2 is supplied through the slow charger 5 so that the slow charger 5 is discharged (see FIG. 7B). shown).

During the daytime, the discharge of the rapid charger 4 is generated by AC power of AC 380V, which is AC power, through the inverter 12 of DC current of 300 ~ 800V generated from the solar panel 1, and the solar panel ( When the amount of power generated in 1) is spared, this AC power is supplied to the electric vehicle (C) by the rapid charger (4) through the PCS (31) and the DC / DC converter (33) to discharge, and the solar panel (1) When the amount of power generation is insufficient, power is supplied from the system power supply (2) to the battery unit (32) through the PCS (31) and supplied to the electric vehicle (C) by the rapid charger (4) through the DC / DC converter (33) discharge takes place Discharging of the rapid charger 4, at night, when the charge amount of the battery unit 32 is sufficient, the rapid charger 4 by withdrawing the electric power charged in the battery unit 32 through the PCS 31 When the amount of charge in the battery unit 32 is insufficient, the late-night power supplied from the system power source 2 is supplied through the rapid charger 4 to discharge the rapid charger 4 ( shown in Figure 7c).

As described above, the electric vehicle charging system for both solar and grid power according to the present invention generates DC current, supplies AC power to the slow charger through an inverter, supplies solar panels installed on the canopy, and AC current. A system power supply supplied by a slow charger, a PCS capable of stable 24-hour operation with a built-in DC connection part and an AC connection part connecting the system power supply and the solar panel, and a battery part that charges and stores electricity supplied from the PCS, and the above A hybrid energy storage unit (ESS) including a DC converter that converts the current supplied from the battery unit or PCS into direct current, and a plurality of rapid chargers that supply DC current supplied from the hybrid energy storage unit to the rapid charger, Including a plurality of slow chargers for slow charging by supplying alternating current from the solar panel and system power source, using the direct current power of the solar panel and at the same time using the late-night power of the system power source to efficiently charge and use the battery unit to reduce operating costs, and the canopy where the energy storage unit, battery unit, and solar panel are installed can be formed to fit a small space, maximizing space utilization, and modules such as PCS and battery unit in the energy storage unit can be integrated into a single unit. By storing it in a building, maintenance of the system becomes easy, and it becomes possible to demonstrate optimal efficiency by integrating operation and management of all stages from faucet to charging.

The solar and grid power combined electric vehicle charging system according to the present invention will be said to be an invention with industrial applicability because it is possible to repeatedly manufacture the same product in the electric vehicle charging system industry.

1: solar panel 2: grid power
3: Energy Storage 4: Rapid Charger
5 : slow charger
11: canopy 12: inverter
30: energy storage unit (ESS) 31: PCS
32: battery 33: DC converter

Claims (3)

In the electric vehicle charging system (A) for both solar and grid power,
The solar and grid power combined electric vehicle charging system (A) generates DC current and supplies AC power to the slow charger (5) via the inverter (12), and the solar panel (1) installed on the canopy (11) )class,
A system power supply (2) for supplying AC current to the slow charger (5);
A PCS capable of stable 24-hour operation with a built-in DC connection part and an AC connection part so that the system power supply (2) and the solar panel (1) are connected, a battery part that charges and stores electricity supplied from the PCS, and the battery part or PCS An energy storage 3 with a hybrid energy storage unit (ESS) installed therein, including a DC converter that converts the current supplied from the current into direct current and supplies the remaining current back to the battery unit;
A rapid charger (4) for supplying DC current supplied from the hybrid energy storage unit to the rapid charger;
An electric vehicle charging system for both solar and grid power, characterized in that it comprises a slow charger (5) for slow charging by supplying alternating current from the solar panel and system power source. According to claim 1,
In the energy storage 3, a hybrid energy storage unit (ESS) 30 is installed inside the container 3a, and the hybrid energy storage unit (ESS) 30 is connected to the grid power supply 2 and the solar panel. (1) a PCS (31) capable of stable 24-hour operation with a built-in DC connection and an AC connection to connect, a battery unit (32) that charges and stores electricity supplied from the PCS, and supplied from the battery unit or PCS Including a DC converter 33 for converting the current to DC,
The energy storage 3 has a distribution board 34, a junction box 35, a firefighting equipment 36, and an HVAC 37 so that functions such as dustproofing, waterproofing, constant temperature/cooling, and fire prevention can be smoothly performed. is installed,
The firefighting equipment 36 of the energy storage 3 includes a housing 361 installed on the upper ceiling of the container 3a, a water storage tank 362 installed on one side of the inside of the housing 361, It is installed on one side of the inside of the enclosure 361 at regular intervals from the water storage tank 362, and contains protein foaming agents, synthetic surfactant foaming agents, aqueous film foaming agents, fluorinated protein foaming agents, and alcohol-resistant foaming agents. A fire extinguishing agent storage tank 363 filled with a fire extinguishing agent selected from ) and a smoke sensor 365 connected to the control unit 364 to detect smoke inside the container 3a according to a control signal from the control unit 364, and a control unit 364 connected to the control unit 364 A heat sensor 366 for detecting heat inside the container 3a according to a control signal of and connected to the control unit 364 and stored in the fire extinguishing agent storage tank 363 according to the control signal of the control unit 364 The solenoid valve 368 for sending the medicine to the mixing unit 367 and the control unit 364 are connected to send the water stored in the water storage tank 362 to the mixing unit 367 according to the control signal of the control unit 364. An electric vehicle charging system for both solar and grid power, characterized in that it includes a pump 369 and a spray nozzle 400 for injecting a mixture of water and fire extinguishing agent in the mixing unit 367 to the outside. According to claim 1 or 2,
The PCS (31) is operated based on the configuration of an industrial PLC and a drive stack, so stable 24-hour operation is possible.
The PCS (31) is equipped with a DC connection part (31a) and an AC connection part (31b) on one panel at the bottom, so that the usable space is reduced and efficiently and compactly manufactured, and the DC connection part (31a) and the AC connection part (31b) A power control unit 31c is provided between ), the DC connection unit 31a includes a DC power breaker and a DC power terminal block, and the AC connection unit 31b includes an AC power breaker, an AC power terminal block, and a system power detection unit. Is included, and the power control unit 31c includes a control power breaker and a control power terminal block so that DC and AC power can be used for both purposes, and the system power supply 2 has an inlet and an outlet installed at the bottom for convenient It can be installed, the PCS (31), the system control unit (31d) is installed on the top,
The battery unit 32 has a fire accident spread suppression function installed to prevent the spread of fire so that the battery unit can be safely operated. ) is installed to collectively store all modules in one rack to improve the space utilization rate, and the structure of the battery unit 32 also provides direct current power supply (+/-) wiring and BMS communication line (Modbus/TCP) Control is possible only by connection,
Since the voltage of the electricity generated by the solar panel 1 is not constant in the DC converter 33, the voltage required for the battery unit 32 or the rapid charger 4 is supplied through the DC / DC switch installed inside, , The electric power generated by the solar panel (1) is passed through the electric vehicle charger (4), and the remaining electricity is recharged in the battery unit (32). system.

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