KR102429217B1 - Error detecting method for charger of electric vehicle and charging managament system therewith - Google Patents

Abstract

The present invention accurately calculates the error between the amount of power supplied from the electric vehicle charging device and the actual power supplied to the vehicle due to power loss due to the self-resistance of the charging cable and plug of the electric vehicle charging device, and at the same time applies the calculated error rate. By being configured to supply power, it is possible not only to increase the reliability and accuracy of the power metering and charging service, but also to reduce the consumer's cost consumption due to an error in the amount of electricity, and the calculation step (S60) and the calculation step (S60) S70) calculates the reference watt-hour amount ( N _nom ) and the reference watt-hour meter watt-hour ( N _act ) using Equation 1, and at the same time, the error rate calculation step (S80) uses Equation 2 to calculate the error rate (δ W _dut ) It relates to a method for measuring an error of an electric vehicle charging device capable of improving the speed and accuracy of calculation processing by being configured to calculate , and a charging management system using the same.

Description

Error detecting method for charger of electric vehicle and charging management system therewith

The present invention relates to a method for measuring an error of a charging device for an electric vehicle and a charging management system using the same, and more particularly, to a method for measuring an error in an electric vehicle charging device and to a charging management system using the same. By accurately calculating the error between the amount of electricity and the amount of electricity supplied to the actual vehicle, it is possible to increase the reliability and accuracy of the electricity metering and charging service, as well as to reduce the cost of consumers due to the error in the amount of electricity. It relates to a method and a charging management system using the same.

Recently, as the automobile industry and battery technology are advanced and interest in environmental issues is rapidly increasing at the same time, interest and penetration rate of electric vehicles (EVs) that use the stored electric energy as a power source by storing electric energy in vehicles this is on the rise.

Such an electric vehicle (EV) includes a vehicle body and accessories provided in a typical vehicle, a battery for storing electric power, an electric motor for generating power using the electric power stored in the battery, and an electric charging device installed on the vehicle body It consists of a charging connector that connects to the charging plug of the

Electric vehicles constructed in this way do not emit exhaust gas because they use electricity as a power source, so they are eco-friendly and have the advantage of low vehicle noise. has

Accordingly, in proportion to the development of electric vehicles, infrastructure such as electric vehicle charging stations for supplying electric power to electric vehicles is also expanding, and research on such electric vehicle systems is being actively conducted.

In general, electric vehicle charging devices are operated by receiving power from the outside through a power cable and then supplying power to the electric vehicle through the charging cable and plug, but due to the characteristics of the charging cable and plug having their own resistance Power loss occurs in these sections. In particular, since the charging cable has a predetermined length of at least 5 m or more, a large power loss is caused.

However, since the conventional electric vehicle charging device charges electricity without considering the power loss of such a charging cable and plug, an error occurs between the amount of electric power charged to the charge and the amount of electric power actually supplied to the electric vehicle.

Accordingly, the applicant of the present invention selected some of the more than 30,000 electric vehicle charging devices installed in Korea and performed a test comparing the amount of electric power displayed on the display panel of the electric vehicle charging device and the final amount of electric power actually supplied to the electric vehicle. , found that their error rate is high in practice.

That is, the conventional electric vehicle charging device did not take into account the power loss caused by the charging cable and plug, and the value of the watt-hour meter inside the electric vehicle charging device was displayed on the display panel as it is (charged on the charging fee). I have been paying the charges even though I haven't been able to fill the battery charge.

1 is a configuration diagram showing a charging device for an electric vehicle disclosed in Korean Patent Application Laid-Open No. 10-2014-0061603 (Title of the Invention: Charging Device for Electric Vehicle).

The electric vehicle charging device (hereinafter referred to as the prior art) 100 of FIG. 1 is independently installed at a position adjacent to the charger 110 and outputs a light pulse proportional to the amount of power supplied to the charger 110 ( 120), a switch 103 installed inside the charger 110 to open and close the power line 112 drawn out from the digital watt-hour meter 120, and supply power according to the charging cost input by the user to the electric vehicle, and A light receiving sensor unit 111 for receiving the light pulse signal emitted from the digital watt-hour meter 120, a charging cable 118 drawn out from the charger 110, and a plug 119 installed at the end of the charging cable 118. is done

In the prior art 100 configured as described above, the charger 110 receives an optical pulse signal whose amplitude is variable according to the amount of power from the digital watt-hour meter 120 and detects the amount of active power, then power is supplied according to the detected amount of active power It has the advantage of reducing the error between the amount of electric power supplied to the electric vehicle and the amount of electric power calculated for the charging rate by being configured so as to increase the user's confidence in the charging rate.

In general, the electric vehicle charging device is operated in such a way that the electric vehicle receives power from the outside through the power line 112 and then supplies the electric power supplied through the charging cable 118 and the plug 119 to the electric vehicle. Due to the characteristics of the charging cable 118 and the plug 119 having, power loss occurs in these sections. In particular, since the charging cable 118 has a predetermined length of at least 5 m or more, a large power loss is caused.

However, in the prior art 100, the power loss of the charging cable 118 and the plug 119 is not taken into account at all, and due to the power loss of the charging cable 118 and the plug 119, it is measured in the digital watt-hour meter 120. There is a problem that the amount of power output through the plug 119 is smaller than the amount of power supplied, and accordingly, a charging fee higher than the amount of power supplied to the electric vehicle is charged, thereby reducing the accuracy and reliability of the charging service.

For example, assuming that the amount of power supplied from the digital watt-hour meter 120 to the charger 110 through the power line 112 is 220V, the digital watt-hour meter 120 transmits an optical pulse corresponding to 220V to the charger 110 . And, the charger 110 charges a charging charge for 220V according to the light pulse transmitted through the light receiving sensor unit 111, but the amount of power supplied to the vehicle through the plug 119 is actually the charging cable 118. And power of less than 220V is supplied due to the power loss of the plug 119 .

That is, there is an urgent need for research to increase the accuracy and reliability of the electric charging service by reducing the error rate between the amount of power actually supplied and the amount of power supplied to the vehicle applied to the rate calculation in consideration of the power loss of the charging cable and plug.

The present invention is to solve this problem, and the problem of the present invention is the amount of power supplied from the electric vehicle charging device and the amount of power supplied to the actual vehicle due to power loss due to the self-resistance of the charging cable and plug of the electric vehicle charging device. By accurately calculating the error of , and supplying power by applying the calculated error rate at the same time, it is possible not only to increase the reliability and accuracy of the power metering and charging service, but also to reduce the cost of consumers due to the error in the amount of electricity. An object of the present invention is to provide a method for measuring an error of a vehicle charging device and a charging management system using the same.

In addition, another solution of the present invention is that the reference-based watt-hour calculation step (S60) and the reference-based watt-hour meter watt-hour calculation step (S70) use Equation 1 to calculate the reference-based watt-hour ( N _nom ) and the reference watt-hour meter watt-hour ( N _act ) at the same time The error rate calculation step (S80) is configured to calculate the error rate (δ W _dut ) of the amount of charging power using Equation 2, thereby improving the speed and accuracy of the calculation processing. Method for measuring an error of an electric vehicle charging device and charging using the same To provide a management system.

In addition, another problem of the present invention is that when the controller collects the amount of energy (charge amount) data 1) is included in the threshold range based on the amount of electricity in the previous cycle, the collected power amount data is determined as invalid data, but 2) before When it is not included in the critical range based on the amount of electricity in a cycle, the collected energy data is determined as valid data, then the energy amount data determined as valid data is transmitted to the charging management server, and the charging management server sends the charging power from the controller When information is not being transmitted, it is possible to maximize the efficiency of data transmission and reception and effectively reduce the network load due to massive data transmission by replacing the amount of electricity in the previous cycle with the current amount and storing it. And to provide a charging management system using the same.

The solution of the present invention for solving the above problems is a housing, a charging cable drawn out from the housing, a plug installed at an end of the charging cable, and electric power installed inside the housing and supplied to the charging cable. Electric vehicle charging devices including a reference system for measuring; controllers connected to each of the electric vehicle charging devices to manage and control the corresponding electric vehicle charging device, and to generate charging power information including charging power information according to charging of the corresponding electric vehicle charging device; and a charging management server for storing and monitoring charging power information received from the controllers of the electric vehicle charging devices, wherein the controllers have an error rate between the amount of power of the reference system and the amount of power of the plug of the corresponding electric vehicle charging device at every preset period a test module for calculating (δ W _dut ); a charging management module for controlling the charging of the electric vehicle charging device so that charging is performed in consideration of the error rate (δ W _dut ) input from the test module; a data collection module for collecting watt-hour information from a reference watt-hour meter of the connected electric vehicle charging device; It is compared whether the amount of power collected by the data collection module is within a threshold range based on the amount of power previously collected, and 1) if the amount of power collected is not within the threshold range based on the amount of power previously collected, the amount of power collected is valid data, 2) a collection data sorting module that determines the amount of collected power as invalid data when the amount of collected power is not within a threshold range based on the previous amount of power; and a data transmission/reception module for transmitting the wattage data selected as valid data by the collection data selection module to the charging management server, wherein the charging management server stores the wattage data received from the controllers, but does not transmit wattage data When there is a non-existing controller, the previous wattage of the controller is replaced with the current wattage and stored, and the operation process (S1) of the test module includes a reference watt-hour meter connection step (S10) for electrically connecting the reference watt-hour meter and the charging plug; a pulse counter connecting step (S20) for connecting the pulse counter and the reference system to the pulse counter and the reference watt-hour meter; After connecting the plug to the connector of the electric vehicle, the plug connection and charging step (S40) of starting charging of the corresponding electric vehicle charging device; A pulse count measuring step (S50) of the pulse counter counting pulses during the period (T) according to the amount of power of the reference system and at the same time counting the pulses during the period (T) according to the amount of power of the reference watt-hour meter; _A reference system wattage calculation _step ( S60); A reference watt-hour meter watt-hour calculation step (S70) in which the pulse counter calculates the watt-hour ( N _act ) of the reference watt-hour meter using the pulse count of the reference watt-hour meter measured by the pulse count measuring step (S50) and Equation 1 (S70) ; The pulse counter includes the following Equation 2, the reference watt-hour amount calculated by the reference watt-hour calculation step S60 ( N _nom ), and the reference watt-hour meter watt-hour amount calculated by the reference watt-hour calculation step S70 ( S70 ) N _act ) to include an error rate calculation step (S80) of calculating the error rate (δ W _dut ) of the amount of charging power by using the.

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According to the present invention having the above problems and solutions, the error between the amount of power supplied from the electric vehicle charging device and the amount of power supplied to the actual vehicle is accurately calculated due to power loss due to the self-resistance of the charging cable and plug of the electric vehicle charging device. At the same time, it is configured to supply power by applying the calculated error rate, so that reliability and accuracy of power metering and charging services can be increased, and consumers' cost consumption due to power error can be reduced.

In addition, according to the present invention, the standard watt-hour calculation step (S60) and the reference watt-hour meter wattage calculation step (S70) use Equation 1 to calculate the reference-based watt-hour ( N _nom ) and the reference watt-hour meter watt-hour ( N _act ) and simultaneously calculate the error rate (S80) is configured to calculate the error rate (δ W _dut ) of the amount of charging power using Equation 2, thereby improving the speed and accuracy of the calculation processing.

In addition, according to the present invention, when the controller collects the amount of power (charge amount) data 1) is included in the threshold range based on the amount of power in the previous cycle, the collected power amount data is determined as invalid data, 2) the amount of power in the previous cycle When it does not fall within the standard threshold range, after determining the collected wattage data as valid data, the wattage data determined as valid data is transmitted to the charging management server, and the charging management server does not receive charging power information from the controller. When not, it is possible to maximize the efficiency of data transmission/reception and effectively reduce the network load due to massive data transmission by replacing the amount of power in the previous cycle with the current amount and storing it.

1 is a configuration diagram showing a charging device for an electric vehicle disclosed in Korean Patent Application Laid-Open No. 10-2014-0061603 (Title of the Invention: Charging Device for Electric Vehicle).
2 is a schematic diagram showing an electric vehicle charging device applied to the present invention.
3 is a flowchart illustrating a method for measuring an error of an electric vehicle charging apparatus according to an embodiment of the present invention.
FIG. 4 is a configuration schematic diagram for explaining FIG. 3 .
5 (a) and (b) are exemplary views for explaining the plug connection and charging step of FIG. 3 .
6 is a flowchart illustrating a method for measuring an error of an electric vehicle charging device according to a second embodiment of the present invention.
FIG. 7 is a configuration schematic diagram for explaining FIG. 6 .
8 is a configuration diagram illustrating a charging management system to which the error test method of the electric vehicle charging device of FIG. 3 is applied.
9 is a block diagram illustrating the controller of FIG. 8 .
10 is a block diagram illustrating the collection data selection module of FIG. 9 .

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a schematic diagram showing an electric vehicle charging device applied to the present invention.

As shown in FIG. 2, the electric vehicle charging device 1 applied to the present invention is formed of a housing in which the power cable 10 is introduced from the outside, and the charging cable C is drawn out on the other side. At this time, the charging plug (5) is installed at the end of the charging cable (C).

In addition, a switch 11 for switching the connection with the incoming power cable 10 is installed inside the electric vehicle charging device 1 .

In addition, a reference system 12 such as a strategy measurement module is installed inside the electric vehicle charging device 1, and the reference system 12 is electrically connected to the internal power line 121 connected to the switch 11 and the charging cable (C). connected to detect the amount of electric power of the electric vehicle charging device (1).

At this time, the reference system 12 is preferably installed adjacent to the point where the internal power line 121 and the charging cable (C) are connected to measure the power supplied from the electric vehicle charging device (1) to the charging cable (C). .

In addition, a display panel (not shown) for displaying the amount of power detected by the reference system 12 is installed on the outer surface of the housing of the electric vehicle charging device 1 .

In addition, the electric vehicle charging device 1 supplies electric power according to a reservation or input from a user to the electric vehicle.

3 is a flowchart illustrating an error measurement method of an electric vehicle charging device according to an embodiment of the present invention, FIG. 4 is a configuration schematic diagram for explaining FIG. 3, and FIGS. 5 (a) and (b) are the plugs of FIG. It is an exemplary diagram for explaining the connection and charging steps.

The method (S1) for measuring the error of the electric vehicle charging apparatus according to an embodiment of the present invention is the electric vehicle charging apparatus ( By accurately calculating the error between the amount of power supplied from 1) and the amount of power supplied to the actual vehicle, it is to increase the reliability and accuracy of the power metering and charging service, as well as to reduce the cost of consumers due to the error in the amount of power.

In addition, the error measurement method (S1) of the electric vehicle charging device, as shown in Figure 3, the reference watt-hour meter connection step (S10), the pulse counter connection step (S20), the plug connection and charging step (S40), pulse count measurement It consists of a step (S50), a step of calculating the amount of power in the reference system (S60), a step of calculating the amount of power in the reference meter (S70), and a step of calculating an error rate (S80).

The reference watt-hour meter connection step ( S10 ) is a step of connecting the reference watt-hour meter 3 with the end P of the plug 5 .

That is, the reference watt-hour meter 3 detects the amount of power of the plug 5 by being connected to the plug 5 through the reference watt-hour meter connection step S10 .

In the pulse counter connection step (S20), the pulse counter 7 is connected to the reference system 12 of the electric vehicle charging device 1 .

At this time, as the pulse counter 7 is connected to the reference system 12 of the electric vehicle charging device 1 through the pulse counter connection step S20, during the period T according to the power supplied from the electric vehicle charging device 1 of pulses are counted.

In addition, the pulse counter connection step (S20) connects the pulse counter 7 with the reference watt-hour meter 3 .

At this time, the pulse counter 7 is connected to the reference watt-hour meter 3 through the pulse counter connection step S20, so that it is possible to count the pulses during the period T according to the power of the end P of the plug 5. .

The plug connection and charging step (S40) is performed by connecting the plug 5 to the connector 91 of the electric vehicle or a separate resistor to the plug 5, as shown in FIGS. After connecting the load 93, the charging of the electric vehicle charging device 1 is started.

In the pulse count measurement step (S50), the pulse counter 7 is connected to the reference system 12 of the electric vehicle charging device 1 to count pulses according to the amount of power supplied from the electric vehicle charging device 1 and at the same time, the reference watt-hour meter It is a step of counting pulses according to the amount of power connected to (3) and supplied to the electric vehicle (or resistive load) through the plug (5).

In general, as the charging cable (C) drawn out from the electric vehicle charging device (1) is manufactured to have a length of at least 5 m or more, the power supplied from the electric vehicle charging device (1) is the charging cable (C) and the plug (5). Power loss occurs due to the load, and an error occurs between the actual amount of power supplied to the electric vehicle through the plug 5 and the amount of electric power measured by the electric vehicle charging device 1 .

The present invention is to solve this problem, and the pulse counter 7 is configured to count pulses according to the amount of power supplied from the electric vehicle charging device 1 and to count pulses according to the amount of power of the plug 5 at the same time. The pulses for the actual amount of power supplied to the vehicle through the plug 5 and the amount of power supplied from the electric vehicle charging device 1 can be accurately counted.

The reference system wattage calculation step (S60) is performed when the pulse counting according to the power supply of the electric vehicle charging device 1 and the plug 5 is completed by the pulse coefficient measuring step (S50), and the pulse counter 7 is the reference system This is a step of calculating the amount of electric power ( N _nom ) of the electric vehicle charging device ( 1 ) during the period (T) by using the pulse coefficient value of (12).

In addition, the reference system wattage calculation step S60 calculates the wattage N _nom of the electric vehicle charging device 1 through Equation 1 below.

In this case, ' N _dut ' is the number of pulses generated by the reference watt-hour meter, ' f _nom ' is the frequency generated in proportion to the power in the reference watt-hour meter, and ' m ' is the reference watt-hour constant (eg, single-phase - 1, three-phase - 3) ), ' U _r ' is the voltage supplied to the reference watt-hour meter, ' I _r ' is the current supplied to the reference watt-hour meter, and ' C _m ' is the meter constant (pulse/kWh) of the electric vehicle charger (or module). .

That is, the reference-based watt-hour calculation step S60 calculates the watt-hour N _nom of the electric vehicle charging device 1 during the period T using Equation 1 described above.

The reference watt-hour calculation step (S70) proceeds when the pulse counting according to the power supply of the electric vehicle charging device 1 and the plug 5 is completed by the pulse counting step (S50), and the pulse counter 7 is It is a step of calculating the amount of power ( N _act ) of the reference watt-hour meter (3) during the period (T) by using the pulse count value of the reference watt-hour meter (3). At this time, it is natural that the amount of power N _act of the reference power meter 3 means the amount of power of the plug 5 .

In addition, the reference watt-hour meter calculating step S70 calculates the watt-hour N _act of the reference watt-hour meter 3 through Equation 1 described above.

In the error rate calculation step (S80), the pulse counter 7 calculates the wattage ( N _nom ) of the reference system 12 calculated by the reference watt-hour calculation step (S60) and the reference watt-hour meter calculated by the reference watt-hour calculation step (S70) 3) is a step of calculating the error rate (δ W _dut ) of the amount of charging power by using the amount of power ( N _act ).

In addition, the error rate calculation step (S80) calculates the error rate (δ W _dut ) of the amount of charging power by using Equation 2 below.

At this time, 'δ W _dut ' is the charging wattage error rate (%), ' N _act ' is the wattage value of the reference watt-hour meter, and ' N _nom ' is the wattage value of the reference system (charger).

That is, the error rate calculation step S80 can quickly and accurately calculate the actual error rate of the wattage N _nom of the reference system 12 and the wattage N _act of the reference watt-hour meter 3 through Equation 2 .

6 is a flowchart illustrating an error measurement method of an electric vehicle charging device according to a second embodiment of the present invention, and FIG. 7 is a configuration schematic diagram for explaining FIG. 6 .

As shown in FIG. 6 , the error measuring method (S200) of the second electric vehicle charging device according to the second embodiment of the present invention includes a measuring instrument connection step (S210), a power analyzer connection step (S220), a plug connection and a charging step. (S230), the reference system power amount receiving step (S240), the measuring instrument power amount receiving step (S250), and the error rate calculation step (S260).

The measuring instrument connection step (S210) is a step of connecting the measuring instrument 93 for measuring current and voltage with the end P of the plug 5, as shown in FIG. 7 .

That is, the measuring instrument 93 detects the amount of power of the plug 5 by being connected to the plug 5 through the measuring instrument connecting step ( S10 ).

The power analyzer connection step (S220) is a step of connecting the power analyzer 9 so as to be able to communicate with the measuring instrument 93 installed by the measuring instrument connection step (S10).

That is, as the power analyzer 9 is connected to the instrument 93 through the power analyzer connection step S220 , the power amount of the plug 5 measured by the instrument 93 can be transmitted from the instrument 93 .

In addition, the power analyzer connection step ( S220 ) is communicatively connected with the electric vehicle charging device 1 to receive the electric power amount of the reference system 12 or the electric power displayed on the display panel from the electric vehicle charging device 1 .

In the plug connection and charging step (S230), as described above in FIG. 5 , after connecting the plug 5 to the connector 91 of the electric vehicle or connecting a separate resistive load 93 to the plug 5 , , a step of starting the charging of the electric vehicle charging device (1).

The reference system wattage receiving step ( S240 ) is a step in which the power analyzer 9 receives the wattage ( wattage of the electric vehicle charging device ) ( N _nom ) measured in the reference system 12 from the electric vehicle charging device 1 .

The measuring instrument wattage calculation step S250 is a step in which the power analyzer 9 receives the wattage (power amount of the plug) ( N _act ) measured by the measuring instrument 93 from the measuring instrument 93 .

In the error rate calculation step (S260), the power analyzer 9 receives the power amount ( N _nom ) of the reference system 12 received through the reference system power amount receiving step (S240) and the meter 93 received through the measuring instrument power amount receiving step (S250) This is a step of calculating the error rate (δ W _dut ) of the amount of charging power by utilizing the amount of power ( N _act ) of .

In addition, the error rate calculation step S260 calculates the error rate δ W _dut using Equation 2 described above.

As such, the error test methods (S1) and (200) of the electric vehicle charging device of the present invention are configured to calculate the error rate (δ W _dut ) in consideration of the power loss due to the load of the charging plug (C) and the charging plug (9) By reducing the error between the amount of electricity applied to charging charges and the amount of electricity actually supplied to the vehicle, it is possible to increase the reliability and accuracy of the electricity metering and charging service, as well as reduce the cost of consumers due to the error in the amount of electricity. .

8 is a configuration diagram illustrating a charging management system to which the error test method of the electric vehicle charging device of FIG. 3 is applied.

As shown in FIG. 8, the charge management system 20 includes the controllers 21-1, ..., 21-N for managing and controlling the electric vehicle charging device 1 of FIG. 3 described above. , controller 21-1, ..., charging service in connection with the charging service platform 24 provided by the charging management server 23, which manages and controls the 21-N, and the charging management server 23 It consists of a client 25 receiving the , and a communication network 29 providing a data movement path between the charging management server 23 and the controller 21-1, ..., 21-N.

The communication network 29 provides a data movement path between the charging management server 23 and the controller 21-1, ..., 21-N, in detail, a wide area network (WAN), a mobile communication network , a wired communication network, LTE, 3G, 4G, 5G, and the like.

The client 25 is a terminal possessed by a user, and in detail, a desktop PC (Desk-top PC), a notebook (Note-book), a smart phone (Smart-phone), a tablet PC (Tablet PC), etc. can be composed of

In addition, the client 25 requests data from the charging management server 23 in connection with the charging service platform 24 provided by the charging management server 23 according to the user's request, and provides response data corresponding to the request data. can be displayed. In this case, the charging service may include information on a parking lot equipped with an electric vehicle charging device, a charging reservation, a payment service according to charging, and the like.

In addition, software, applications and applications for providing a charging service to a user in connection with the charging service platform 8 may be installed in the client 9 .

9 is a block diagram illustrating the controller of FIG. 8 .

The controller 21 of FIG. 9 manages and controls the overall operation of the electric vehicle charging device 1 .

In addition, as shown in FIG. 9 , the controller 21 includes a control module 210 , a memory 211 , a data transmission/reception module 212 , a charge management module 213 , a test module 214 , and a data collection module ( 215), a collection data selection module 216, and a charging power information generation module 217.

The control module 210 is an O.S (Operating System) of the controller 21 , and manages and manages control objects 211 , 212 , 213 , 214 , 215 , 216 , and 217 . control

In addition, the control unit 210 executes the test module 214 every preset period, and when the error rate δ W _dut is calculated by the test module 214 , the calculated error rate data δ W _dut is transferred to the charge management module Enter as (213).

Identification information of the corresponding electric vehicle charging device 1 is preset and stored in the memory 211 .

In addition, the memory 211 temporarily stores the collected data collected by the data collection module 215 and the charging power information generated by the charging power information generating module 217 .

The charging management module 213 manages and controls the overall operation of the electric vehicle charging device 1 .

In addition, the charging management module 213 controls the charging of the electric vehicle charging device 1 so that charging is performed in consideration of the error rate (δ W _dut ) input from the test module 214 to be described later, thereby self-resistance of the charging cable and plug It is possible to reduce the error between the amount of power supplied from the electric vehicle charging device and the amount of power supplied to the actual vehicle due to the power loss caused by this.

The test module 214 is executed at preset intervals according to the control of the control module 210, and the error measurement method S1 of the electric vehicle charging apparatus of FIGS. 3 to 5 described above or the second method of FIGS. 6 and 7 described above The error rate (δ W _dut ) is calculated using the error measurement method ( S200 ) of the electric vehicle charging device.

At this time, the error rate (δ W _dut ) calculated by the test module 214 is input to the charge management module 213 under the control of the control module 210 , and the charge management module 213 is input from the test module 214 . In consideration of the error rate (δ W _dut ), the electric vehicle charging device 1 is controlled so that charging is performed.

The data collection module 214 collects power amount (charge amount) information from the reference power meter 3 in real time.

The collection data selection module 215 selects valid data among the collection data collected by the data collection module 214 .

10 is a block diagram illustrating the collection data selection module of FIG. 9 .

As shown in FIG. 10 , the measurement data selection module 216 includes a collection data input module 2161 and a comparison and discrimination module 2162 .

The collection data input module 2161 receives the amount of power data collected by the data collection module 215 .

The comparison and determination module 2162 compares whether the amount of power data input by the collection data input module 2161 is included within a threshold range based on the amount of power previously collected by using a preset threshold range.

In addition, the comparison and determination module 2162 determines the input power amount data as valid data, which is valid data, when the input power amount is not included in the threshold range based on the previous power amount.

In addition, the comparison and determination module 2162 determines the input power amount data as invalid data, which is invalid data, when the input power amount is included in a threshold range based on the previous power amount.

At this time, the power amount data selected as valid data by the comparison and determination module 2162 is input to the charging power information generation module 217 under the control of the control module 210 .

When the charging power information generation module 217 receives the charging amount data selected as valid data by the collection data selection module 216, charging power information including the input charging amount data, time information, and identification information of the electric vehicle charging device , and the generated charging power information is transmitted to the charging management server 23 through the data transmission/reception module 212 under the control of the control module 210 .

The charging management server 23 stores the charging power information received from the controllers 21-1, ..., 21-N in the database server, and at the same time analyzes the big data, which is the charging power information stored in the database server, Generate and detect meaningful information. In this case, the meaningful information means the usage state of each charging station, the generation of statistical data of the charging amount of each charging device, and the like.

In addition, when charging power information is not received from the controllers 21-1, ..., 21-N, the charging management server 23 replaces the previous charging power of the controller with the current charging power and replaces the database with the current charging power. Save it to the server.

At this time, if the number of the controllers 21-1, ..., (21-N) is huge, the charge management server 23 is configured to control each of the controllers 21-1, ..., (21-N) in real time. When it is assumed that charging power information is received from transmits the charging power information to the charging management server 23 only when out of the critical range with It is possible to dramatically reduce the amount of data transmission by storing

As described above, the method (S1) for measuring the error of the electric vehicle charging device according to an embodiment of the present invention is based on the amount of power supplied from the electric vehicle charging device and the actual vehicle due to power loss due to the self-resistance of the charging cable and plug of the electric vehicle charging device. By accurately calculating the error in the amount of power supplied and applying the calculated error rate at the same time to supply power, the reliability and accuracy of the power metering and charging service can be increased as well as reducing the cost of consumers due to the error in the amount of power. be able to

In addition, the error measurement method (S1) of the electric vehicle charging device of the present invention is the reference system watt-hour calculation step (S60) and the reference watt-hour meter watt-hour calculation step (S70) using Equation 1 ( N _nom ) and the reference watt-hour meter wattage ( N _act ) is calculated and the error rate calculation step (S80) is configured to calculate the error rate (δ W _dut ) of the amount of charging power using Equation 2, thereby improving the speed and accuracy of the calculation processing.

In addition, the charging management system 20 of the present invention determines the collected wattage data as invalid data when the controller 21 collects the wattage (charging amount) data 1) within a threshold range based on the wattage of the previous cycle. However, 2) when it is not included in the critical range based on the amount of electricity in the previous cycle, the collected electricity amount data is determined as valid data, and then the energy amount data determined as valid data is transmitted to the charging management server, and the charging management server When the battery does not receive charging power information from the controller, it is possible to maximize the efficiency of data transmission and reception and effectively reduce the network load due to massive data transmission by replacing the power amount of the previous cycle with the current power amount and storing it.

S1: Method of measuring error of electric vehicle charging device
S10: Standard watt-hour meter connection step S20: Pulse counter connection step
S30: Power analyzer connection step S40: Plug connection and charging step
S50: Pulse meter measurement step S60: Reference meter wattage calculation step
S70: Standard watt-hour meter watt-hour calculation step S80: Error rate calculation step
S200: Method of measuring error of the second electric vehicle charging device
S210: instrument connection step S220: power analyzer connection step
S230: Plug connection and charging step S240: Reference system wattage receiving step
S250: Meter power amount receiving step S260: Error rate calculation step
1: Electric vehicle charging device 3: Standard watt-hour meter
5: Plug 7: Pulse counter
9: Power Analyzer 11: Switch
12: Reference system 21-1, ..., 21-N: Controllers
23: charge management server 25: client
29: communication network

Claims (3)

Electric vehicle charging devices including a housing, a charging cable drawn out from the housing, a plug installed at an end of the charging cable, and a reference system installed inside the housing to measure power supplied to the charging cable;
controllers connected to each of the electric vehicle charging devices to manage and control the corresponding electric vehicle charging device, and to generate charging power information including charging power information according to charging of the corresponding electric vehicle charging device;
and a charging management server for storing and monitoring charging power information received from the controllers of the electric vehicle charging devices,
the controllers
a test module for calculating an error rate (δ W _dut ) between the amount of power of the reference system of the corresponding electric vehicle charging device and the amount of power of the plug at each preset period;
a charging management module for controlling the charging of the electric vehicle charging device so that charging is performed in consideration of the error rate (δ W _dut ) input from the test module;
a data collection module for collecting watt-hour information from a reference watt-hour meter of the connected electric vehicle charging device;
It is compared whether the amount of power collected by the data collection module is within a threshold range based on the amount of power previously collected, and 1) if the amount of power collected is not within the threshold range based on the amount of power previously collected, the amount of power collected is valid data, 2) a collection data sorting module that determines the amount of collected power as invalid data when the amount of collected power is not within a threshold range based on the previous amount of power;
and a data transmission/reception module for transmitting the amount of power data selected as valid data by the collection data selection module to the charging management server,
The charging management server is
Storing the power amount data received from the controllers, but when there is a controller that has not transmitted the power amount data, the previous power amount of the corresponding controller is replaced with the current power amount and stored;
The operation process (S1) of the test module is
a reference watt-hour meter connection step (S10) for electrically connecting the reference watt-hour meter and the plug;
a pulse counter connecting step (S20) for connecting the pulse counter and the reference system to the pulse counter and the reference watt-hour meter;
After connecting the plug to the connector of the electric vehicle, the plug connection and charging step (S40) of starting charging of the corresponding electric vehicle charging device;
A pulse count measuring step (S50) of the pulse counter counting pulses during the period (T) according to the amount of power of the reference system and at the same time counting the pulses during the period (T) according to the amount of power of the reference watt-hour meter;
A reference system wattage calculation step of calculating the wattage ( N _nom ) of the reference system using the pulse count ( N _dut ) of the reference system measured by the pulse counter measuring step (S50) and the following Equation 1 (S60) );
A reference watt-hour meter watt-hour calculation step (S70) of calculating the watt-hour ( N _act ) of the reference watt-hour meter using the pulse count of the reference watt-hour meter measured by the pulse counter measuring step (S50) and Equation 1;
Equation 2 following the pulse counter, the reference watt-hour calculation step (S60), the reference watt-hour amount ( N _nom ), the reference watt-hour meter watt-hour amount ( N ) _act ) by utilizing an error rate calculating step (S80) of calculating an error rate (δ W _dut ) of the amount of charging power.
[Equation 1]

In this case, ' N _dut ' is the number of pulses generated from the electric vehicle charger (or module), ' f _nom ' is the frequency generated in proportion to the power in the reference watt-hour meter, and ' m ' is the constant of the reference watt-hour meter (eg, single-phase - 1) , 3 phase - 3), ' U _r ' is the voltage supplied to the reference watt-hour meter, ' I _r ' is the current supplied to the reference watt-hour meter, and ' C _m ' is the meter constant of the electric vehicle charger (or module) ( pulse/kWh),
[Equation 2]

At this time, 'δ W _dut ' is the charging wattage error rate (%), ' N _act ' is the wattage value of the reference watt-hour meter, and ' N _nom ' is the wattage value of the reference system of the electric vehicle charging device for the same time delete delete

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