CN113246782A - Method for monitoring operation error of direct current charging pile - Google Patents

Method for monitoring operation error of direct current charging pile Download PDF

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Publication number
CN113246782A
CN113246782A CN202110578834.0A CN202110578834A CN113246782A CN 113246782 A CN113246782 A CN 113246782A CN 202110578834 A CN202110578834 A CN 202110578834A CN 113246782 A CN113246782 A CN 113246782A
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charging pile
charging
operation error
charging gun
monitoring
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CN202110578834.0A
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CN113246782B (en
Inventor
李熊
张宏达
刘炜
肖涛
陈枫
金正军
陆春光
王朝亮
李亦龙
李波
李媛
陈凯华
茅奕晟
陈婧韵
宋磊
吕建
马笛
孙微庭
严朝豪
巩国栋
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Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
State Grid Zhejiang Electric Vehicle Service Co Ltd
Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
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Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
State Grid Zhejiang Electric Vehicle Service Co Ltd
Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/66—Data transfer between charging stations and vehicles
    • B60L53/665—Methods related to measuring, billing or payment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Abstract

The invention belongs to the technical field of charging piles, and particularly relates to a method for monitoring operation errors of a direct-current charging pile. Aiming at the defect that the operation error of the charging pile is detected by adopting a field verification system at present, the invention adopts the following technical scheme: a method for monitoring the operation error of a direct current charging pile comprises the following steps: establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, inherent loss, the energy conversion efficiency of a charging pile AC-DC conversion module and equivalent operation error parameters according to an energy conservation law; acquiring electric quantity data of each charging gun metering point on an alternating current side and a direct current side of a charging pile and energy conversion efficiency of the charging pile; and substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain the inherent electric quantity loss of the charging pile and the equivalent operation error parameters of each charging gun. The invention has the beneficial effects that: the on-site detection is not needed, the timeliness is high, and the on-line real-time analysis can be realized.

Description

Method for monitoring operation error of direct current charging pile
Technical Field
The invention belongs to the technical field of charging piles, and particularly relates to a method for monitoring operation errors of a direct-current charging pile.
Background
Under the big background of global energy crisis and serious environmental crisis, the application and development of new energy vehicles are actively promoted by the government of China, and the charging/replacing station is used as an important matching infrastructure necessary for developing the electric vehicles and has very important social benefits and economic benefits. The movement of building electric vehicle charging/replacing stations has been developed nationwide.
The basic principle of the direct current charging pile is that alternating current input from an alternating current side is converted into direct current output from a direct current side through an alternating current-direct current (AC-DC) conversion function of a charger, and the direct current output is connected with an electric automobile through a charging gun to charge the electric automobile. An AC-DC conversion module is connected with one or more charging guns, and each charging gun is provided with an electric energy metering device (namely a direct current meter) for metering output electric quantity. In the actual operation process of charging the stake, need to fill the stake state and detect. At present, a monitoring method for operation errors of a charging pile metering point mainly comprises field verification.
Along with filling the continuous increase of electric pile quantity, the scheme of monitoring is carried out to filling electric pile measurement point through the mode of on-the-spot examination, must bring the geometric multiple increase of work load, and the electric pile running error monitoring technology and the management mode are filling that research is new, on-line, the price/performance ratio is high imperatively.
Disclosure of Invention
The invention provides a method for monitoring the running error of a direct current charging pile, aiming at the defects of large workload and long verification period of the direct current charging pile determined by a field full-inspection mode at present, so as to reduce the field detection workload and improve the detection efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for monitoring the operation error of a direct current charging pile comprises the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, inherent loss, the energy conversion efficiency of a charging pile AC-DC conversion module during stable work and equivalent operation error parameters of each charging gun according to an energy conservation law;
acquiring electric quantity data and charging pile energy conversion efficiency of each charging gun metering point on the alternating current side and the direct current side of the charging pile in a plurality of stable working metering cycles;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain the inherent electric quantity loss of the charging pile and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging gun with the error threshold value of the ammeter, and judging whether the metering of the charging gun is normal.
According to the method for monitoring the operation error of the direct-current charging pile, equations about the power supply electric quantity of the alternating-current side, the power consumption of each charging gun, inherent loss, the energy conversion efficiency of the AC-DC conversion module of the charging pile and equivalent operation error parameters are established, after electric quantity data of metering points of each charging gun on the alternating-current side and the direct-current side of the charging pile in a plurality of metering cycles and the energy conversion efficiency of the charging pile are obtained, equivalent operation error parameters can be obtained through calculation, the operation error of the charging gun is further obtained, and the charging pile with the operation error exceeding the error is output according to the current electric meter operation error threshold. The charging gun operation error comprises an AC-DC conversion module error and a charging gun metering error, and under a normal condition, the AC-DC conversion module error and the charging gun operation error are both in a normal range. Also, the efficiency of the AC-DC conversion module may decay over its life, but the decay is extremely limited. In the case where the AC-DC conversion module is not damaged, the reduction in efficiency thereof is negligible. In actual operation, when a large abnormality occurs, the AC-DC conversion module is often damaged, and the unnatural attenuation is too large. The AC-DC conversion module error and the charging gun metering error are judged as a whole, so that the feasibility is higher, and the practicability is stronger.
As an improvement, the equation is:
Figure BDA0003085463920000021
in the formula, epsilon0For inherent loss, eta is the energy conversion efficiency of the AC-DC conversion module of the charging pile, Ki is the equivalent measurement parameter of each charging gun, phiDC，i(j) For each charging gun, phiAC(j) For charging stake AC side power supply electric quantity, i is the rifle number that charges, and N is the rifle quantity that charges.
As an improvement, the system of equations is:
Figure BDA0003085463920000022
wherein P is the metering period, P > N +1, and the following are provided:
Figure BDA0003085463920000023
in the formula, dy (j) is the deviation amount of the charging pile electricity metering after the conversion efficiency is corrected,
due to the change of conversion efficiencyThe later charging pile electric quantity metering deviation dy (j) can be supplied with electric quantity phi from the alternating current side of the charging pileAC(j) The electric quantity phi of each charging gun at the direct current sideDC，i(j) The energy conversion efficiency eta of the AC-DC conversion module of the charging pile is obtained, and the unknown number is only epsilon0And kappaiThe AC side power supply electric quantity phi of the charging pileAC(j) The electric quantity phi of each charging gun at the direct current sideDC，i(j) And substituting the energy conversion efficiency eta of the AC-DC conversion module of the charging pile into an equation set, and solving to obtain equivalent operation error parameters Ki of each charging gun.
As an improvement, the operating error epsilon of each charging guniIs obtained by the following formula:
Figure BDA0003085463920000031
as an improvement, the AC side power supply quantity phiAC(j) Obtained by reading an ac meter provided on the ac side.
As an improvement, the power consumption phi of each charging gunDC，i(j) Obtained by reading the charging gun meter.
As an improvement, the inherent loss ε0Charging, display and communication modules of the charging pile are included.
As an improvement, the stable working metering period refers to that the average charging power in the metering period is greater than 20% of the rated power, and the conversion efficiency of the AC-DC conversion module is at a stable value close to the field detection value at this time.
As an improvement, the average energy conversion efficiency eta of the charging pile AC-DC conversion module is stable when the charging pile AC-DC conversion module works stably (the output power is more than 20% of the rated power). The fluctuation of the conversion efficiency of different charging processes in the actual work of the charging pile near the detection value is equivalent to adding certain noise on the conversion efficiency column of the equation set, and the effectiveness of the final operation error is not influenced.
As an improvement, the stable deviation of the conversion efficiency η of the charging pile AC-DC conversion module during actual operation from the factory calibration value is equivalent to the deviation of the operation error, so that for different types and batches of direct-current charging piles, the conversion efficiency of the charging pile during stable operation within the current calculation time range can be obtained through factory calibration data or other measurement methods such as periodic sampling inspection.
In the second step, the acquired data is remotely transmitted to a server to realize remote online monitoring.
As a refinement, the equation is obtained as follows:
according to the law of conservation of energy, there are:
the AC side power supply quantity is equal to the DC side charging quantity + inherent loss + (AC-DC) conversion module loss quantity (1)
Wherein the AC-DC conversion module efficiency eta satisfies:
Figure BDA0003085463920000032
the formula (1) and the formula (2) are combined to obtain
(ac side power supply capacity-inherent loss) · η ═ dc side power supply capacity (3)
Recording the real power consumption of each charging gun at the DC side, namely the charging quantity at the DC side, as XDC，i(j) Then the formula (3) can be represented as
Figure BDA0003085463920000033
Simultaneously, the method comprises the following steps:
Figure BDA0003085463920000034
obtained by the formula (5):
Figure BDA0003085463920000041
substituting formula (6) for formula (4) to obtain:
Figure BDA0003085463920000042
the charging pile electricity quantity metering deviation dy (j) after the conversion efficiency correction is as follows:
Figure BDA0003085463920000043
due to the fact that
Figure BDA0003085463920000044
Substituting formula (8) with formula (9) and formula (7), there are:
Figure BDA0003085463920000045
combined vertical type (8) and formula (10) are
Figure BDA0003085463920000046
The method for monitoring the operation error of the direct current charging pile has the beneficial effects that: the method comprises the steps of establishing an equation about the power supply electric quantity on the AC side, the power consumption of each charging gun, inherent loss, the energy conversion efficiency of an AC-DC conversion module of the charging pile and equivalent operation error parameters, obtaining electric quantity data of each charging gun metering point on the AC side and the DC side of the charging pile in a plurality of metering cycles and the energy conversion efficiency of the charging pile, calculating to obtain the equivalent operation error parameters, further obtaining the operation error of the charging gun, comparing the operation error of the charging gun with the current operation error threshold of the ammeter, and outputting a charging pile list with an out-of-tolerance operation error to serve as a to-be-detected list for on-site verification or operation and inspection. The analysis method has high timeliness, can perform online real-time analysis and has low comprehensive cost.
Drawings
Fig. 1 is a circuit topology structure of a direct charging pile to which the method for monitoring the operation error of the direct charging pile of the present invention is applied.
Fig. 2 is a flowchart of a first embodiment of the method for monitoring an operation error of the dc charging pile according to the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and are not all embodiments. Other embodiments obtained by persons skilled in the art without any inventive work based on the embodiments in the embodiment belong to the protection scope of the invention.
Referring to fig. 1 and 2, the method for monitoring the operation error of the dc charging pile according to the present invention includes the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, inherent loss, the energy conversion efficiency of a charging pile AC-DC conversion module and equivalent operation error parameters of each charging gun according to an energy conservation law;
acquiring electric quantity data and charging pile energy conversion efficiency of each charging gun metering point on the alternating current side and the direct current side of the charging pile in a plurality of metering cycles;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain the inherent electric quantity loss of the charging pile and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging gun with a threshold value, and judging whether the charging gun is normally metered.
According to the method for monitoring the operation error of the direct-current charging pile, equations about the power supply electric quantity at the alternating-current side, the power consumption of each charging gun, the inherent loss, the energy conversion efficiency of the AC-DC conversion module of the charging pile and the equivalent operation error parameters are established, and after electric quantity data and the energy conversion efficiency of the charging pile at the metering points of each charging gun at the alternating-current side and the direct-current side of the charging pile in a plurality of metering cycles are obtained, the equivalent operation error parameters can be obtained through calculation, so that the operation error of the charging gun is obtained. The charging gun operation error comprises an AC-DC conversion module error and a charging gun metering error, and under a normal condition, the AC-DC conversion module error and the charging gun operation error are both in a normal range. Also, the efficiency of the AC-DC conversion module may decay over its life, but the decay is extremely limited. In the case where the AC-DC conversion module is not damaged, the reduction in efficiency thereof is negligible. And when a large abnormality occurs, the AC-DC conversion module is damaged rather than the unnatural attenuation is too large. The AC-DC conversion module error and the charging gun metering error are judged as a whole, so that the feasibility is higher, and the practicability is stronger.
Example one
Referring to fig. 1 and 2, a method for monitoring an operation error of a dc charging pile according to an embodiment of the present invention includes the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, inherent loss, the energy conversion efficiency of a charging pile AC-DC conversion module and equivalent operation error parameters of each charging gun according to an energy conservation law;
acquiring electric quantity data and charging pile energy conversion efficiency of each charging gun metering point on the alternating current side and the direct current side of the charging pile in a plurality of metering cycles;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain the inherent electric quantity loss of the charging pile and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging guns with a threshold value, and judging whether the metering of each charging gun is normal.
In this embodiment, the equation is:
Figure BDA0003085463920000061
in the formula, epsilon0For inherent loss, eta is the energy conversion efficiency of the AC-DC conversion module of the charging pile, Ki is the equivalent measurement parameter of each charging gun, phiDC，i(j) For charging gunsElectric quantity phiAC(j) And supplying power to the AC side of the charging pile, wherein i is the serial number of the charging guns, N is the number of the charging guns, and j is the serial number of the metering period.
In this embodiment, the system of equations is:
Figure BDA0003085463920000062
wherein P is a metering period, P > N +1,
the following steps are provided:
Figure BDA0003085463920000063
in the formula, dy (j) is the deviation amount of the charging pile electricity metering after the conversion efficiency is corrected,
the charging pile electricity quantity metering deviation dy (j) after the conversion efficiency is corrected can be used for supplying electricity quantity phi (j) from the alternating current side of the charging pileAC(j) The electric quantity phi of each charging gun at the direct current sideDC，i(j) The energy conversion efficiency eta of the AC-DC conversion module of the charging pile is obtained, and the unknown number is only epsilon0And kappaiThe AC side power supply electric quantity phi of the charging pileAC(j) The electric quantity phi of each charging gun at the direct current sideDC，i(j) And substituting the energy conversion efficiency eta of the AC-DC conversion module of the charging pile into an equation set, and solving to obtain equivalent operation error parameters Ki of each charging gun.
In this embodiment, the operating error ε of each charging guniIs obtained by the following formula:
Figure BDA0003085463920000064
this embodiment is applicable to and has interchange side measurement point in filling electric pile, and interchange side electric quantity measurement accurate fill electric pile. This embodiment is applicable to the electric pile that fills that has one or more direct current rifle that charges, and every rifle that charges of direct current rifle all has the electric quantity measurement function, for direct current side measurement point.
In this embodiment, the AC side power supply quantity phiAC(j) By readingAnd obtaining the data by taking an alternating current meter arranged on an alternating current side.
In this embodiment, the power consumption φ of each charging gunDC，i(j) Obtained by reading the charging gun meters provided at the respective charging guns.
In this embodiment, the inherent loss ε0Charging, display and communication modules of the charging pile are included. The inherent loss comprises modules which can consume electric energy, such as charging, display, communication and the like of the charging pile, and the power consumption of the modules is low and basically unchanged.
In this embodiment, the energy conversion efficiency η of the charging pile AC-DC conversion module at the stable working stage is an inherent attribute of the equipment, and may be obtained by methods such as factory verification data.
In the second step, the obtained data is remotely transmitted to the server, so that remote online monitoring is realized.
In this embodiment, the equation, equation (11), is obtained according to the following logic:
according to the law of conservation of energy, there are:
the AC side power supply quantity is equal to the DC side charging quantity + inherent loss + (AC-DC) conversion module loss quantity (1)
Wherein the AC-DC conversion module efficiency eta satisfies:
Figure BDA0003085463920000071
the formula (1) and the formula (2) are combined to obtain
(ac side power supply capacity-inherent loss) · η ═ dc side power supply capacity (3)
Recording the real power consumption of each charging gun at the DC side, namely the charging quantity at the DC side, as XDC，i(j) Then equation (3) can be expressed as:
Figure BDA0003085463920000072
XDC，i(j) is a theoretical value, XDC，i(j) And measured value phiDC，i(j) There are the following relationships between:
Figure BDA0003085463920000073
obtained by the formula (5):
Figure BDA0003085463920000074
substituting formula (6) for formula (4) to obtain:
Figure BDA0003085463920000075
setting the charging pile electricity quantity metering deviation dy (j) after the conversion efficiency correction as:
Figure BDA0003085463920000081
due to the fact that
Figure BDA0003085463920000082
Substituting formula (8) with formula (9) and formula (7), there are:
Figure BDA0003085463920000083
combined vertical type (8) and formula (10) are
Figure BDA0003085463920000084
The operation error monitoring method of the direct current charging pile has the beneficial effects that: by establishing an equation about the power supply quantity at the AC side, the power consumption of each charging gun, the inherent loss, the energy conversion efficiency of the charging pile AC-DC conversion module and the equivalent operation error parameter, after the electric quantity data and the energy conversion efficiency of the charging pile at the metering points of each charging gun at the AC side and the DC side of the charging pile in a plurality of metering cycles are obtained, the equivalent operation error parameter can be obtained through calculation, and further the operation error of the charging gun is obtained; the operation error is not directly solved, the equivalent operation error parameter is solved firstly and then converted into the operation error, other approximate conditions are not introduced in the calculation process, and the accuracy of the calculation result is ensured; the timeliness is high, and online real-time analysis can be realized; the method can be realized and deployed on the existing car networking or power grid data platform, is low in realization cost, and can realize online monitoring.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto but is intended to cover all modifications and equivalents as may be included within the spirit and scope of the invention. Any modification which does not depart from the functional and structural principles of the invention is intended to be included within the scope of the following claims.

Claims (10)

1. A method for monitoring operation errors of a direct current charging pile is characterized by comprising the following steps: the method for monitoring the operation error of the direct current charging pile comprises the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, inherent loss, the energy conversion efficiency of a charging pile AC-DC conversion module during stable work and equivalent operation error parameters of each charging gun according to an energy conservation law;
acquiring electric quantity data and charging pile energy conversion efficiency of each charging gun metering point on the alternating current side and the direct current side of the charging pile in a plurality of stable working metering cycles;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain the inherent electric quantity loss of the charging pile and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging gun with the error threshold value of the ammeter, and judging whether the metering of the charging gun is normal.
2. The method for monitoring the operation error of the direct-current charging pile according to claim 1, characterized in that: the equation is:
Figure FDA0003085463910000011
in the formula, epsilon0For inherent loss, eta is the energy conversion efficiency of the AC-DC conversion module of the charging pile, Ki is the equivalent measurement parameter of each charging gun, phiDC，i(j) For each charging gun, phiAC(j) And supplying power to the AC side of the charging pile, wherein i is the serial number of the charging guns, N is the number of the charging guns, and j is the serial number of the metering period.
3. The method for monitoring the operation error of the direct-current charging pile according to claim 2, characterized in that: the system of equations is:
Figure FDA0003085463910000012
wherein P is a metering period, P > N +1,
the following steps are provided:
Figure FDA0003085463910000013
in the formula, dy (j) is the deviation amount of the charging pile electricity metering after the conversion efficiency is corrected,
the charging pile electricity quantity metering deviation dy (j) after the conversion efficiency is corrected can be used for supplying electricity quantity phi (j) from the alternating current side of the charging pileAC(j) The electric quantity phi of each charging gun at the direct current sideDC，i(j) The energy conversion efficiency eta of the AC-DC conversion module of the charging pile is obtained, and the unknown number is only epsilon0And kappaiThe AC side power supply electric quantity phi of the charging pileAC(j) The electric quantity phi of each charging gun at the direct current sideDC，i(j) And substituting the energy conversion efficiency eta of the AC-DC conversion module of the charging pile into an equation set, and solving to obtain equivalent operation error parameters Ki of each charging gun.
4. The method for monitoring the operation error of the direct-current charging pile according to claim 3, wherein the method comprises the following steps: running error epsilon of each charging guniIs obtained by the following formula:
Figure FDA0003085463910000014
5. the method for monitoring the operation error of the direct-current charging pile according to claim 2, characterized in that: AC side power supply electric quantity phiAC(j) Obtained by reading an ac meter provided on the ac side.
6. The method for monitoring the operation error of the direct-current charging pile according to claim 2, characterized in that: power consumption phi of each charging gunDC，i(j) Obtained by reading the charging gun meter.
7. The method for monitoring the operation error of the direct-current charging pile according to claim 2, characterized in that: inherent loss epsilon0Charging, display and communication modules of the charging pile are included.
8. The method for monitoring the operation error of the direct-current charging pile according to claim 2, characterized in that: the energy conversion efficiency of the charging pile AC-DC conversion module is obtained through factory verification data.
9. The method for monitoring the operation error of the direct-current charging pile according to claim 1, characterized in that: and in the second step, the acquired data is remotely transmitted to a server, so that remote online monitoring is realized.
10. The method for monitoring the operation error of the direct-current charging pile according to claim 2, characterized in that: the equation is obtained as follows:
according to the law of conservation of energy, there are:
the AC side power supply quantity is equal to the DC side charging quantity + inherent loss + (AC-DC) conversion module loss quantity (1)
Wherein the AC-DC conversion module efficiency eta satisfies:
Figure FDA0003085463910000021
the formula (1) and the formula (2) are combined to obtain
(ac side power supply quantity-inherent loss) · η ═ dc side charging quantity (3)
Recording the real power consumption of each charging gun at the DC side, namely the charging quantity at the DC side, as XDC，i(j) Then equation (3) can be expressed as:
Figure FDA0003085463910000022
simultaneously, the method comprises the following steps:
Figure FDA0003085463910000023
obtained by the formula (5):
Figure FDA0003085463910000024
substituting formula (6) for formula (4) to obtain:
Figure FDA0003085463910000025
the charging pile electricity quantity metering deviation dy (j) after the conversion efficiency correction is as follows:
Figure FDA0003085463910000026
due to the fact that
Figure FDA0003085463910000027
Substituting formula (8) with formula (9) and formula (7), there are:
Figure FDA0003085463910000031
combined vertical type (8) and formula (10) are
Figure FDA0003085463910000032
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