KR101216703B1 - Eco-friendly electric vehicle charging system - Google Patents

Abstract

Power generation unit for generating electric power through renewable energy, system power supply unit for supplying power in parallel with the power generation unit, charging and discharging unit for storing the power generated in the power generation unit as standby power to the battery, power to the power source of the electric vehicle EMS for controlling the operating state of the charging unit, the power generation unit, the system power supply unit, the charging unit and the charging and discharging unit, the power generation unit, the system power supply unit, the charging and discharging unit, the charging unit and the connection unit for supplying Management system), wherein the system power supply unit is capable of supplying power to the charge / discharge unit or the charging unit according to the state of standby power of the storage battery, and the charge / discharge unit according to the state of standby power of the storage battery. An eco-friendly electric vehicle charging system that can return surplus power to the grid power supply is an eco-friendly electric vehicle charging system. Is present an effect of recycling to produce power at the same time as the leveling of the chungbang all possible load, and can charge the electric vehicle of the various battery capacity and ensure the power stability of the system to increase the renewable energy power generation efficiency.

Description

Eco-friendly electric vehicle charging system

The present invention relates to an environmentally friendly electric vehicle charging system, and more particularly

The present invention relates to an eco-friendly electric vehicle charging system that stably supplies electric power generated through renewable energy to electric vehicles of various capacities, and recycles surplus electric power to system power.

An electric vehicle is a vehicle that is driven by the power of a battery installed in a vehicle. The vehicle must be charged when the battery is discharged by driving the vehicle.

The electric vehicle charging system has a method of charging by using a power (hereinafter referred to as 'system power') transmitted through electrical linkages covering a wide area including power plants, substations, and transmission lines.

And after power generation by using renewable energy (hereinafter referred to as 'renewable energy') including solar heat, solar power, biomass, wind power, hydropower, geothermal, marine energy, waste energy, fuel cells, coal liquefied gas, and hydrogen energy There is a method of charging using the power stored in the battery.

Electric power generated through renewable energy was converted into alternating current for power delivery, transferred to the charging device through the system power line, and then converted into direct current to charge the battery of the electric vehicle.

Even when delivered to a battery, the power delivered in the form of alternating current is converted into a direct current in the battery charging system and stored and used as charging power of an electric vehicle.

Since the conventional charging system method is configured around a system power source, the AC method becomes a main transmission form of electric power, so the generated power of new and renewable energy is converted into AC and then converted into DC when charging the battery or when stored in a battery. There has been a problem that the renewable energy utilization rate is lowered by the conversion of the repeated power form.

In addition, there was a problem in that power supply with rapid and excessive variability caused by directly transmitting power generated from renewable energy to grid lines causes instability of power on grid lines.

Furthermore, electric vehicle charging systems are being constructed for small electric vehicles and large electric vehicles, respectively, and there existed a problem that the initial installation cost according to the high-voltage power supply line and the new construction of the charging device of each electric vehicle are required.

The present invention is to supply the electric power generated by the renewable energy to the stable supply of electric vehicles of various power capacity through the parallel circuit, and convert the form of the generated power to the system by returning to the system to recycle the eco-friendly electric vehicle charging system It aims at constructing.

Eco-friendly electric vehicle charging system according to the invention the power generation unit; Grid power supply unit; Charge and discharge unit; A charging unit; Connection; EMS (energy management system) unit; It may include.

In the present invention, the power generation unit may generate power through renewable energy.

The power generation unit may include a DC converter for converting power generated from renewable energy into a DC state.

The power generation unit may include a communication unit for exchanging operation information with the EMS unit.

In the present invention, the system power supply unit may supply power in parallel with the power generation unit.

The grid power supply unit may include a bidirectional PWM converter capable of switching between direct current and alternating current states of power.

The system power supply unit may include a communication unit for exchanging operation information between the EMS unit and the system power supply.

In the present invention, the charging and discharging unit may store power generated by the power generation unit as standby power in the storage battery.

The charging and discharging unit may return surplus power to a system power supply unit according to a state of standby power of the storage battery.

The charging and discharging unit may include a DC converter for adjusting the amount of power delivered to the storage battery.

The charging and discharging unit may include a buck booster for boosting or stepping down the power delivered to the charging unit.

The charging and discharging unit may include a discharge communication unit for exchanging operation information and control signals of the EMS unit and the charging and discharging unit.

The charging and discharging unit may include a charging and discharging control unit for controlling the charging and discharging unit and the system power supply unit or the power of the charging unit.

In the present invention, the charging unit may be connected to the charging and discharging unit to supply power to the power source of the electric vehicle.

The charging unit may include one or more charging stages connected in parallel to the electric vehicle to supply power.

The charging unit may include a charging communication unit for exchanging operation information and control signals of the EMS unit and the charging unit.

The charging unit may include a charging control unit for controlling the operation of the charging stage is transmitted to the power source of the electric vehicle is connected.

In the present invention, the connection unit may connect the power generation unit, the system power supply unit, the charging unit and the charging and discharging unit.

The connection unit may include a connection communication unit for exchanging operation information and control signals of the EMS unit and the connection unit.

The connection unit may include a connection control unit for controlling the access of the power between the power generation unit, the grid power supply unit and the charge and discharge unit.

In the present invention, the EMS unit may control the operation state of the power generation unit, the system power supply unit, the charging and discharging unit, the charging unit and the connection unit.

The EMS unit may include a communication module for transmitting and receiving a control signal or operation information simultaneously with any one or more of the power generation unit, the system power supply unit, the charging and discharging unit, the charging unit, or the connection unit.

The EMS unit may include an EMS control unit that analyzes operation information transmitted from at least one of the power generation unit, the system power supply unit, the charging and discharging unit, the connection unit, or the charging unit, and controls the operation state of each unit.

The communication unit or the communication module may use a serial communication method or an RF wireless communication method.

According to the present invention, the eco-friendly electric vehicle charging system is capable of equalizing the load of the charging and discharging unit, recycling the production power, and charging the electric vehicle having a power source of various capacities, improving the renewable energy generation efficiency and improving the system. There is an effect of ensuring the stability of the power.

1 is a view showing the configuration of an environmentally friendly electric vehicle charging system according to an embodiment of the present invention. And
2 is a view showing a detailed configuration of an environment-friendly electric vehicle charging system according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, an embodiment of an environment-friendly electric vehicle charging system according to the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and Duplicate explanations will be omitted.

In general, a converter refers to a rectifier and includes a form of converting a direct current into an alternating current (hereinafter, referred to as a "dc-to-dc converter") or an alternating current into a direct current (hereinafter, referred to as a "dc-dc converter").

The DC-DC converter is a converter for converting from a DC power supply of a predetermined voltage to a DC power supply of another voltage.

The direct current converter means a converter (hereinafter, referred to as a "direct current converter") in which the output form of electric power includes the AC-DC converter and the DC-DC converter.

A bi-directional PWM (Pulse-Width-Modulation) converter is a converter that enables the conversion of DC-type power into AC or AC-type power into DC.

The buck booster converter is a DC-DC converter that combines a buck converter and a booster converter.

The buck converter is a step-down converter that lowers the output voltage than the input voltage, and the booster converter is a boost converter with a higher output voltage than the input voltage.

The energy management system (EMS) refers to a system that monitors all aspects of power system operation in a centralized manner and controls the power plants and substations for efficient power system operation.

Serial communication refers to the process of transmitting data one bit at a time over a communication channel or computer bus.

Serial communication includes various interfaces, and there are communication methods of interfaces such as LAN, RS-232, RS-422, and RS-485.

Multi-drop refers to a method in which a single communication line is shared by multiple users through an identifier address of each circuit user.

Wireless communication refers to a communication method using radio waves, also referred to as RF (Radio Frequency) wireless communication.

1 is a view showing the configuration of an environmentally friendly electric vehicle charging system according to an embodiment of the present invention, Figure 2 is a view showing a detailed configuration of an environmentally friendly electric vehicle charging system according to an embodiment of the present invention. .

1 and 2, the eco-friendly electric vehicle charging system according to an embodiment of the present invention, the power generation unit 1000, the system power supply unit 2000, charging and discharging unit 4000, charging unit 6000, connecting portion 3000 It may include an energy management system (EMS) unit 7000.

The power generation unit 1000 according to an embodiment of the present invention may generate power through renewable energy.

The power generation unit 1000 may include any one or more of the photovoltaic generator 600 or the wind power generator 610.

The generator 1000 may include a first DC-DC converter 700 connected to the photovoltaic generator 600, and may include an AC-DC converter 710 connected to the wind generator 610. .

The photovoltaic generator 600 or the wind power generator 610 may generate power by using photovoltaic or wind power.

The first DC-DC converter 700 or the AC-DC converter 710 may output the electric power generated from the solar generator 600 or the wind power generator 610 as electric power having a constant size of DC.

The type of generator included in the power generation unit 1000 is not limited to the photovoltaic generator 600 or the wind power generator 610, and may include all generators of a power generation method using renewable energy.

According to the power generation method using renewable energy, a DC converter may be included such that the output has a direct current form regardless of the direct current or alternating current form.

The direct current converter may allow power transmitted on the power transmission line to be transmitted in the form of direct current.

Even when several generators are connected in parallel, the size of the power output from the DC converter can be adjusted uniformly to predict the specifications of the power transmission line, which is effective in designing and utilizing the transmission line.

The power is transferred from the power generation unit 1000 to the charging and discharging unit 4000 by a direct current, and the power storage in the form of direct current to the storage battery 500 is generated by the direct current of the new renewable energy power generation power is converted into AC Compared to being stored in the form of direct current after being transferred to the power storage place, since the conversion from direct current to direct current has a small loss due to the conversion of the power form.

The first DC-DC converter 700 may include a first communication unit 200, and the AC-DC converter 710 may include a second communication unit 210.

The first communication unit 200 and the second communication unit 210 may exchange operation information such as whether the EMS unit 7000 and the generation unit, which are described later, the generation amount, the output state, and the like.

The first communication unit 200 and the second communication unit 210 may use a serial communication method or an RF wireless communication method.

The system power supply unit 2000 according to an embodiment of the present invention may supply power in parallel with the power generation unit 1000.

The system power supply unit 2000 may transfer power to the charge / discharge unit 4000 for power storage of standby power according to the power storage state of the charge / discharge unit 4000.

The system power supply unit 2000 may supply power to the charging unit 6000 to charge a power source of the electric vehicle connected to the charging unit 6000.

The system power supply unit 2000 may supply power to the charging unit 6000 simultaneously or selectively with power according to the power storage state of the charge / discharge unit 4000.

The system power supply unit 2000 may include a bidirectional PWM converter 720 and a third communication unit 220.

The bidirectional PWM converter 720 may alternately switch between DC and AC states of power.

The grid power supply 2000 may convert the power of the AC state into DC through the bidirectional PWM converter 720 to supply the charge / discharge unit 4000.

The grid power supply unit 2000 may receive power by converting the DC power into AC when surplus power exceeding the storage capacity of the charge / discharge unit 4000 is returned to the grid power supply 2000.

The third communication unit 220 may exchange operation information such as operation of the EMS unit 7000 and the system power supply unit 2000 described later, generation amount, output state, and the like.

The third communication unit 220 may use a serial communication method or an RF wireless communication method.

The charging and discharging unit 4000 according to an exemplary embodiment may store power generated by the power generator 1000 as standby power in the storage battery 500.

The charge / discharge unit 4000 may return surplus power to the system power supply 2000 according to the level of standby power of the storage battery 500.

The charge / discharge unit 4000 may include a storage battery 500, a second DC-DC converter 705, a buck booster 730, a charge / discharge control unit 110, and a charge / discharge communication unit 240.

The storage battery 500 may store power delivered to the charge / discharge unit 4000 as standby power.

The second DC-DC converter 705 may output the power transmitted to the charge / discharge unit 4000 as power having a constant DC shape.

The buck booster 730 may boost or reduce the output power transmitted from the charge / discharge unit 4000 to the charger 6000.

The charge / discharge control unit 110 may measure a state of standby power (hereinafter, 'state of standby power') such as standby power level of the battery 500, whether there is a failure, a standby state of a power supply, and the like.

The charge / discharge control unit 110 converts the output power through the second DC-DC converter 705 so that the power delivered to the charge / discharge unit 4000 may be stored in the storage battery 500, and thus, the storage battery 500 may be converted into standby power. It can be controlled to be stored.

The charge / discharge control unit 110 may control to convert the magnitude of the output power through the buck booster 730 when the standby power of the battery 500 is sent to the charging unit 6000.

Electric vehicles of various power source capacities connected to the charging unit 6000 may be charged according to the power source capacities through a process of boosting or depressurizing output power through the buck booster 730.

The charge / discharge control unit 110 may control the surplus power to be transferred to the system power supply unit 2000 according to the standby power state of the battery 500.

Since the storage capacity of the battery 500 of the charge / discharge unit 4000 follows the capacity of the storage battery, when the power transmitted from the power generation unit 1000 exceeds the capacity of the storage battery 500, the storage 500 is stored in the storage battery 500. The generated power can be returned to the system power supply 2000.

The power return to the grid power supply 2000 has the stability of the power supply state and power quality since the load stabilization of the charging and discharging unit 4000 and the stored power are supplied from the charging and discharging unit 4000 for the excess power supply. The advantage is that power generation can be recycled.

According to the present invention, the state for the power of the charge / discharge unit 4000 to return to the system power supply 2000 is not necessarily limited to the power storage state in which the storage capacity of the battery 500 is exceeded. The condition can be determined.

The charge / discharge communication unit 240 may exchange operation information such as control signals of the EMS unit 7000 and the charge / discharge unit 4000, operation state of the charge / discharge unit 4000, output state, standby power state, and the like, which will be described later.

The charge / discharge communication unit 240 may use a serial communication method or an RF wireless communication method.

The charging unit 6000 according to an embodiment of the present invention may be connected to the charging and discharging unit 4000 to supply power to a power source of the electric vehicle.

The charging unit 6000 may include one or more charging terminals 320, a charging control unit 130, and a charging communication unit 260.

One or more charging stages 320 may be connected in parallel with a power source of the electric vehicle to supply power.

The charging control unit 130 may control the operation of the charging stage 320 to which power is transmitted in accordance with the power source of the electric vehicle to be connected.

The charging communication unit 260 may exchange operation information such as the control unit of the EMS unit 7000 and the charging unit 6000, operation state of the charging unit 6000, power supply state of the charging unit 320, and the like, which will be described later.

The charging communication unit 260 may use a serial communication method or an RF wireless communication method.

The electric vehicle may be connected to one or more charging stages 320 to supply power to a power source, and one charging stage 320 to more than one charging stage 320 may be combined according to the capacity of the electric vehicle's power source. Can be supplied.

The connection part 3000 according to an embodiment of the present invention may connect the power generation part 1000, the system power supply part 2000, the charging part 6000, and the charge / discharge part 4000.

The connection unit 3000 may include a connection communication unit 230 and a connection control unit 100.

The connection communication unit 230 may exchange control information of the connection unit 3000 and operation information such as the connection state of the line of the EMS unit 7000 and the connection unit, power flow, power transmission state, and the like, which will be described later.

The connection control unit 100 may control access of power between the power generation unit 1000, the system power supply unit 2000, the charging unit 6000, and the charge / discharge unit 4000.

The connection controller 100 may control the connection state such that the generated power of the generator 1000 is transmitted to the charge / discharge unit 4000.

When the standby power of the charge / discharge unit 4000 does not reach a predetermined level, the connection controller 100 may control the connection state so that the power of the system power supply 2000 is transferred to the charge / discharge unit 4000.

When the standby power of the charge / discharge unit 4000 does not reach a predetermined level, the connection controller 100 may control the connection state so that the power of the system power supply 2000 is transferred to the charger 6000.

The connection controller 100 may control the connection state so that surplus power of the charge / discharge unit 4000 may return to the system power supply 2000 when the power storage state exceeds the storage capacity of the battery 500 of the charge / discharge unit 4000. Can be.

The EMS unit 7000 according to an embodiment of the present invention may control the operation state of the power generation unit 1000, the system power supply unit 2000, the charge / discharge unit 4000, the charge unit 6000, and the connection unit 3000.

The EMS unit 7000 may include a communication module 400 and an EMS control unit 140.

The communication module 400 may include at least one communication unit among the first communication unit 200, the second communication unit 210, the third communication unit 220, the connection communication unit 230, the charge / discharge communication unit 240, and the charge communication unit 260. And at the same time it can send and receive any one or more of the control signal or operation information.

The communication module 400 may use a serial communication method or an RF wireless communication method.

A communication module and a method of simultaneously transmitting and receiving signals with at least one communication unit of each unit may take a multidrop method.

The EMS control unit 140 analyzes operation information of the power generation unit 1000, the system power supply unit 2000, the charge / discharge unit 4000, the charging unit 6000, and the connection unit 3000 received through the communication module 400, and the connection unit. The control signal may be transmitted to any one or more of the connection unit 230, the charge / discharge communication unit 240, and the charge communication unit 260, which is a communication unit of the 3000, the charge / discharge unit 4000, and the charger 6000.

According to the control signal, the connection control unit 100 of the connection unit 3000, the charge / discharge control unit 110 of the charge / discharge unit 4000, and the charge control unit 130 of the charge unit 6000 may control the operation state and power in and out of each unit. Can be.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

100: connection control unit
110: charge and discharge control unit
130: charge control unit
140: EMS control unit
200: first communication unit
210: second communication unit
220: third communication unit
230: connection communication unit
240: charge and discharge communication unit
260: charging communication unit
320: charging stage
400: communication module
500 storage battery
600: solar power generator
610: wind power generator
700: first DC-DC converter
705: second DC-DC converter
710: AC-DC Converter
720: Bidirectional PWM Converter
730: Buck Booster
1000: power generation unit
2000: Grid power
3000: connection
4000: charging and discharging unit
6000: charging unit
7000: EMS

Claims (7)

Power generation unit for generating power through renewable energy;
A system power supply unit supplying power in parallel with the power generation unit;
A charge / discharge unit configured to store power generated by the power generation unit as standby power in a storage battery;
A charging unit connected to the charging and discharging unit to supply power to a power source of an electric vehicle;
A connection part connecting the power generation part, the system power supply part, the charging part, and the charging and discharging part; And
An EMS (Energy Management System) unit for controlling an operation state of the power generation unit, the system power supply unit, the charging and discharging unit, the charging unit, and the connection unit; Including;
The grid power supply unit is connected to enable supply of power to the charge / discharge unit or the charging unit according to the state of standby power of the storage battery of the charge / discharge unit.
The charging unit, at least one charging stage for supplying power by connecting one or more in parallel according to the capacity of the power source of the electric vehicle; A charging communication unit configured to exchange operation information and control signals of the EMS unit and the charging unit; And a charging control unit for controlling whether or not the operation of the charging stage is transmitted power in accordance with the power source of the electric vehicle to be connected; Including,
The charging and discharging unit, a DC converter for adjusting the amount of power delivered to the storage battery; Buck booster for boosting or stepping down the power delivered to the charging unit according to the power source capacity of the electric vehicle; A charge / discharge communication unit for exchanging operation information and control signals of the EMS unit and the charge / discharge unit; And a charge / discharge control unit controlling the buck booster according to a power source capacity of the electric vehicle to boost or reduce the voltage output from the storage battery to the one or more charging stages. Eco-friendly electric vehicle charging system comprising a. The method of claim 1,
The power generation unit,
DC converter for converting power generated from renewable energy into a DC state; And
A communication unit for exchanging operation information of the EMS unit and the power generation unit; Eco-friendly electric vehicle charging system comprising a. The method of claim 1,
The system power supply unit,
A bidirectional pulse-width-modulation (PWM) converter capable of alternately switching the DC and AC states of power; And
A communication unit for exchanging operation information of the EMS unit and the system power supply unit; Eco-friendly electric vehicle charging system comprising a. delete delete The method of claim 1,
The connecting portion
A connection communication unit which exchanges operation information and control signals of the EMS unit and the connection unit; And
A connection control unit controlling access of electric power between the power generation unit, the grid power supply unit, and the charging and discharging unit; Eco-friendly electric vehicle charging system comprising a. The method of claim 1,
The EMS unit,
Communication module for transmitting and receiving a control signal or operation information simultaneously with any one or more of the power generation unit, the system power supply unit, the charging and discharging unit, the connection unit or the charging unit;
An EMS control unit for analyzing operation information transmitted from at least one of the power generation unit, the system power supply unit, the charging and discharging unit, the connection unit, or the charging unit, and controlling an operation state of each unit; Eco-friendly electric vehicle charging system comprising a.

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