CN111313477B - Charging power adjusting method and system - Google Patents

Charging power adjusting method and system Download PDF

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Publication number
CN111313477B
CN111313477B CN202010133419.XA CN202010133419A CN111313477B CN 111313477 B CN111313477 B CN 111313477B CN 202010133419 A CN202010133419 A CN 202010133419A CN 111313477 B CN111313477 B CN 111313477B
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charging
power
controller
data
transformer
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CN111313477A (en
Inventor
周强
范涛
倪键树
茹永刚
史晓江
刘宝成
卫建荣
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Xi'an Lingchong Infinite New Energy Technology Co ltd
Xi'an Telai Intelligent Charging Technology Co ltd
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Xi'an Telingchong New Energy Technology Co ltd
Xi'an Telai Intelligent Charging Technology Co ltd
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    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • B60L53/64—Optimising energy costs, e.g. responding to electricity rates
    • 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
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/12—Electric charging stations
    • 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 provides a charging power adjusting method and system, and belongs to the technical field of electric power. The method is applied to a first controller in a charging regulation system, and comprises the following steps: the first controller acquires the electrical data of the transformer acquired by the acquisition device; respectively receiving power resource data and charging data of each charging group sent by a plurality of second controllers; calculating total load data of the transformer and droop coefficients corresponding to the charging groups according to the electrical data, the power resource data and the charging data by adopting a preset droop algorithm; and sending the total load data of the transformer and the droop coefficients corresponding to the charging groups to a second controller, so that the second controller adjusts the power of the corresponding charging groups according to the total load data of the transformer and the droop coefficients corresponding to the charging groups. The invention can improve the equipment utilization rate and the operation safety of the power system.

Description

Charging power adjusting method and system
Technical Field
The invention relates to the technical field of electric power, in particular to a charging power adjusting method and system.
Background
In order to make the residential quarter construction more comprehensive, a charging facility is usually set in the residential quarter to charge electric vehicles in the residential quarter, and a set of charging power adjusting method can be correspondingly set to ensure the safety of electricity consumption while the charging facility is set.
In the prior art, a single charging device is usually used, and is set according to the voltage and current required by a battery, so as to perform autonomous power regulation on the maximum power which is met, however, in the regulation process according to the method, factors such as the capacity limit of a distribution transformer are not considered, so that the installed capacity of the charging device is limited, the potential safety hazard of a distribution system exists in the working process, the device utilization rate of a power system is low, and the safety of the charging process is also reduced.
Disclosure of Invention
The invention aims to provide a charging power adjusting method and a charging power adjusting system, which can improve the equipment utilization rate and the operation safety of a power system.
The embodiment of the invention is realized by the following steps:
in one aspect of the embodiments of the present invention, a charging power adjustment method is provided, where the method is applied to a first controller in a charging adjustment system, and the charging adjustment system includes: the method comprises the following steps of a first controller, a collecting device, a transformer, a plurality of charging groups and a plurality of second controllers, wherein the transformer is in communication connection with the first controller through the collecting device, each charging group is in communication connection with the corresponding second controller, the first controller is in communication connection with the second controllers, and the method comprises the following steps:
acquiring electrical data of the transformer acquired by an acquisition device;
respectively receiving power resource data and charging data of each charging group sent by a plurality of second controllers;
calculating total load data of the transformer and droop coefficients corresponding to the charging groups according to the electrical data, the power resource data and the charging data by adopting a preset droop algorithm;
and sending the total load data of the transformer and the droop coefficients corresponding to the charging groups to the second controller, so that the second controller adjusts the power of the corresponding charging groups according to the total load data of the transformer and the droop coefficients corresponding to the charging groups.
Optionally, before receiving the power resource data and the charging data of each charging group sent by the plurality of second controllers, respectively, the method further includes:
receiving registration information sent by a second controller;
and finishing the registration of the second controller according to the registration information.
Optionally, the method further comprises: and if the second controller is detected to be offline, stopping calculating the droop coefficient of the charging group corresponding to the second controller.
Optionally, the sum of the droop coefficients corresponding to the plurality of charging groups is 1.
Optionally, the method further comprises: receiving an adjusting instruction sent by a remote background system, wherein the adjusting instruction is used for adjusting total load data of the transformer; the remote background system is used for controlling the first controller.
Optionally, the method further comprises: and sending the total load data of the transformer to a remote background system.
In another aspect of the embodiments of the present invention, a charging power adjustment method is provided, which is applied to a second controller in a charging adjustment system, where the charging adjustment system includes: the method comprises the following steps of a first controller, a collecting device, a transformer, a plurality of charging groups and a plurality of second controllers, wherein the transformer is in communication connection with the first controller through the collecting device, each charging group is in communication connection with the corresponding second controller, the first controller is in communication connection with the second controllers, and the method comprises the following steps:
sending power resource data and charging data of the connected charging group to a first controller;
receiving total load data of the transformer sent by the first controller and calculating a droop coefficient corresponding to the charging group according to the power resource data and the charging data;
and acquiring the target power adjusted by the charging group according to the droop coefficient and the charging data corresponding to the charging group by adopting a droop control algorithm corresponding to the charging group.
Optionally, the method further comprises: and receiving a load scheduling instruction sent by a remote background system, wherein the load scheduling instruction is used for indicating and adjusting a constant in the droop control algorithm.
Optionally, the method further comprises: the registration information is sent to the first controller.
In another aspect of the embodiments of the present invention, a charging power adjustment system is provided, including: the transformer is in communication connection with the first controller through the acquisition device, each charging group is in communication connection with the corresponding second controller, and the first controller is in communication connection with the second controllers.
The first controller is used for executing the method for adjusting the charging power applied to the first controller; the second controller is configured to perform the above-described method of adjusting charging power applied to the second controller.
The embodiment of the invention has the beneficial effects that:
in the charging power adjusting method and system provided by the embodiment of the invention, the preset droop algorithm can be adopted, and the total load data of the transformer and the droop coefficient corresponding to each charging group are calculated according to the electrical data, the power resource data and the charging data, so that the second controller can adjust the power of the corresponding charging group according to the total load data of the transformer and the droop coefficient corresponding to each charging group, and the equipment utilization rate and the operation safety of the power system can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a charging power regulating system according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a charging power adjustment method applied to a first controller according to an embodiment of the present invention;
fig. 3 is another schematic flowchart of a charging power adjustment method applied to a first controller according to an embodiment of the present invention;
FIG. 4 is an illustration of an embodiment of the present invention providing adjustments using a down plumb line;
fig. 5 is a flowchart illustrating a charging power adjustment method applied to a second controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Fig. 1 is a schematic structural diagram of a charging power regulating system according to an embodiment of the present invention, and referring to fig. 1, the charging power regulating system includes: the system comprises a first controller 100, an acquisition device 200, a transformer 300, a plurality of charging groups 400 and a plurality of second controllers 500, wherein the transformer 300 is in communication connection with the first controller 100 through the acquisition device 200, each charging group 400 is in communication connection with the corresponding second controller 500, and the first controller 100 is in communication connection with the second controllers 500.
In the process of communicating with the plurality of second controllers 500, the first controller 100 may preferably communicate with each other using ethernet. The first controller 100 and the second controller 500 may be a control chip, a control circuit, or other control devices, and are not limited herein. The collection device 200 may be a current transformer, a smart meter, or the like for acquiring electrical data of the transformer 300. The transformer 300 may be a power supply transformer used in a residential area, a commercial mall, an industrial park, or the like. The charging group 400 can be a plurality of charging interfaces arranged in the charging pile or other charging equipment, each charging group 400 can be correspondingly provided with a second controller 500, the second controllers 500 can be arranged in the charging pile where the corresponding charging group 400 is located, the charging pile corresponding to the charging group 400 can also comprise a charger, in order to meet the requirements of different charging units, two different chargers, namely a direct-current charger and an alternating-current charger, can be correspondingly arranged, and in the operation process, the direct-current charger and the alternating-current charger can be arranged or only one of the direct-current charger and the alternating-current charger can be arranged. It should be noted that the charging group 400 may charge a charging terminal, and the charging terminal may be an electric charging vehicle, for example: electric vehicles such as electric automobiles and electric bicycles.
All chargers in the system may be independently connected to the charging operation platform, or may be collectively connected to the charging operation platform through a communication path of the second controller 500, and channels through which the chargers are connected to the charging operation platform may be independent. The charging operation platform can be a cloud platform and is used for operating and maintaining the charging adjustment system. In addition, the first controller 100 and the plurality of second controllers 500 may also preferably use a 4G network to communicate with a remote backend system, which may be a charging operation platform or a specially established independent dedicated platform, such as: and a power demand side dispatching system platform.
The plurality of charging groups 400 and the transformer 300 may be connected to the same public power grid, each charging group 400 is connected to the public power grid, and the transformer 300 may be directly connected to the power grid or may be connected to the power grid after being connected to the acquisition device 200 (fig. 1 shows that the transformer is connected to the acquisition device 200 and then connected to the power grid). The public power grid is also connected with a plurality of residential electricity utilization interfaces for providing electric energy for production and living for residents in a place; a common electrical interface for providing electrical power to other facilities in the venue.
In addition, the residential electricity consumption in the embodiment of the invention refers to the sum of all the residential electricity consumption interfaces and the public electricity consumption interface except the electricity consumption of the charging group.
Fig. 2 is a schematic flowchart of a charging power adjustment method applied to a first controller according to an embodiment of the present invention, please refer to fig. 2, in which the method is applied to the first controller in a charging adjustment system, and the method includes:
s110: and acquiring the electrical data of the transformer acquired by the acquisition device.
It should be noted that the electrical data of the transformer acquired by the acquisition device includes original electrical data of the transformer and calculated electrical data calculated by the acquisition device according to the original electrical data. Wherein the raw electrical data may include: data of electric quantity such as voltage, current and the like of the transformer outgoing line; the computing the electrical data may include: the total active power and the total reactive power of the transformer, the active power of each phase of the transformer, the reactive power of each phase of the transformer, the electric quantity and other electric data.
S120: and respectively receiving the power resource data and the charging data of each charging group sent by the second controllers.
It should be noted that the power resource data may be a proportional relationship between the power loads of the charging groups collected by the second controller, for example, co-exist in two charging groups, a first charging group occupying a 50kW power load, a second charging group occupying a 100kW power load, the power load ratio relationship between the two is 1, the occupation relationship among a plurality of charging groups can be obtained correspondingly, that is, the power resource data can represent the amount of the tunable resource data of each charging group, the power load occupied by the tunable resource data is also large, because the charging piles in which different charging groups are located have different numbers of charging interfaces, different charging units accessed by different charging interfaces have different power loads required during charging, and the difference of non-adjustable resources (when the power needs to be adjusted downwards, a certain charging unit reaches the minimum charging power, then it becomes a non-adjustable resource; or, when power up-regulation is required, a certain charging unit has reached maximum power, it also becomes an unmodulatable resource; or the charging unit connected with the AC charging pile does not respond to the PWM pulse width adjusting instruction sent by the charging pile, the charging unit also becomes an unadjustable resource, so that power loads among a plurality of groups are different, and different proportion relations exist; the charging data may be charging data such as charging power, output voltage, output current, operating status (for example, charging status or idle status, and may further include a fault to be repaired status and a fault repaired status if a fault occurs) of the charging group during the charging operation.
S130: and calculating the total load data of the transformer and the droop coefficient corresponding to each charging group according to the electrical data, the power resource data and the charging data by adopting a preset droop algorithm.
Optionally, in the process of calculating the droop coefficient, the total power load of the power supply of the transformer may be determined according to the electrical data; the total power load of all charging groups can be determined according to the charging data; the ratio between the power loads between the respective groups may be determined from the power resource data. Determining the power load of the electricity consumed by residents according to the total power load of the transformer power supply and the total power load of all the charging groups; the power load of each charging group can be determined according to the total power load of all charging groups and the ratio of the power load among the charging groups.
The droop coefficient corresponding to each charging group may be a coefficient representing a relationship between the power load of the charging group and the residential power load, the total droop coefficient may represent a relationship between the total power load of all charging groups and the residential power compliance, and the total droop coefficient is also a sum of all droop coefficients, and the total load data of the transformer includes the total power load supplied by the transformer, the total power load of all charging groups, and the power load of each charging group.
S140: and sending the total load data of the transformer and the droop coefficients corresponding to the charging groups to a second controller, so that the second controller adjusts the power of the corresponding charging groups according to the total load data of the transformer and the droop coefficients corresponding to the charging groups.
It should be noted that, the second controller may determine a plurality of droop lines according to the droop coefficient of each charging group and the total transformer load data, and each droop line is used to represent the relationship between the power load of the charging group and the power load of the residential electricity. In addition, a general down-plumb line may be determined that characterizes the relationship between the total power load and the residential power load for all charging groups.
According to the total downward hanging line and each downward hanging line, the constraint ranges of the power load of the residential electricity and the total power load of all the charging groups and the power load of each charging group can be determined. When the power load of the electricity consumed by the residents or the power load of any one charging group changes, if the changing condition is within the constraint range, the power load can be automatically adjusted according to the requirement, for example, when the number of charging units accessed by the charging group increases, the power load can be adjusted upwards; accordingly, when the charging unit accessed by the charging group is reduced, the power load can be adjusted downwards. If the variation is in the constraint range or exceeds the constraint range, adjusting the power load on the general droop line or the droop line corresponding to the varied charging group, for example, when the power load of the residential electricity is increased, adjusting the power load of the charging group according to the corresponding relation of the droop lines; correspondingly, when the power load of the residential electricity consumption is reduced, the power load of the charging group is adjusted upwards according to the corresponding relation of the down vertical lines.
In addition, in the process of performing power adjustment on the charging power adjustment system by using the charging power adjustment method, the steps of S110 to S140 may be performed in a loop.
According to the charging power adjusting method and system provided by the embodiment of the invention, the preset droop algorithm can be adopted, and the total load data of the transformer and the droop coefficient corresponding to each charging group are calculated according to the electrical data, the power resource data and the charging data, so that the second controller can adjust the power of the corresponding charging group according to the total load data of the transformer and the droop coefficient corresponding to each charging group, and the equipment utilization rate and the operation safety of the power system can be improved.
Fig. 3 is another schematic flow chart of a charging power adjustment method applied to a first controller according to an embodiment of the present invention, and referring to fig. 3, before receiving power resource data and charging data of each charging group sent by a plurality of second controllers, the method further includes:
s150: and receiving the registration information sent by the second controller.
It should be noted that the registration information may include: the label of the second controller, the label of the charging group corresponding to the second controller, and the like.
S160: and finishing the registration of the second controller according to the registration information.
It should be noted that, after receiving the registration information, the registration information may be checked, for example, whether the registration information meets the registration requirement, whether the registration information has already been registered, and the like.
After the second controller is successfully registered, the power resource data and the charging data of each corresponding charging group can be sent to the first controller. Or, if the second controller is not successfully registered, the first controller does not process the power resource data and the charging data of the charging group after receiving the power resource data and the charging data, but deletes the power resource data and the charging data.
Fig. 4 is an exemplary diagram of adjusting by using a vertical line, please refer to fig. 4, wherein an ordinate represents a total power load of a charged group, an abscissa represents a power load of residential electricity, and a straight line L is illustrated 0 I.e. the total downward vertical line, represents the constraint relationship between the total power load of all the charging groups and the power load of the residential electricityIs described. In the embodiment of the present invention, two charging groups can be taken as an example, L 1 、L 2 The drooping lines correspond to the first charging group and the second charging group respectively.
It should be noted that the total power capacity of the transformer may be set according to specific power supply requirements, which may be 500kVA in this embodiment, and the total power load P of all charging groups tol-ch Power load P with residential electricity Rd The constraint relationship between the two is as follows:
P tol-ch ≤-k×P Rd -C+P e
where k is the total droop coefficient, C is an offset constant, for a safety margin set aside for the regulation of the charging power, P e Is the rated power load of the transformer, i.e. the total power capacity of the transformer in this embodiment is 500kVA.
Straight line L 0 The following area is a safe area for the operation of the transformer, and the total power load of all the charging groups is not constrained at this time, that is, if the power load changes in the safe area, the power can be adjusted according to specific requirements; when the total power load P of all charging groups tol-ch And power load P of residential electricity Rd To a straight line L 0 At a certain point of time, the total load P of charging tol-ch It is necessary to perform the constraint on this straight line. For example, when P Rd =100kW, total power load P of all charging groups tol-ch Has a limitation of 375kW, when the system is operated in the straight line L 0 On point P of (A), correspondingly, if P Rd From 100kW to 200kW, the total power load P of all charging groups tol-ch Is 275kW, i.e. when the system is operating in line L 0 At point p'.
The specific calculation formula is as follows:
ΔP tol-ch ＝-k×ΔP
wherein, Δ P tol-ch The second controller may control the amount to be adjusted Δ P based on the amount to be adjusted Δ P, where Δ P is the amount of change in the power load of the residential electricity tol-ch Power conditioning is performed for all charging groups.
Accordingly, L 1 、L 2 The power regulation can be correspondingly carried out on each charging group by the aid of the down plumbs corresponding to the first charging group and the second charging group respectively, and the power load P of the first charging group 1-ch A second charging group P 2-ch Respectively with the power load P of the residential electricity Rd The constraint relationship between them is as follows:
P 1-ch ＝-k 1 ×P Rd -C 1 +P e
P 2-ch ＝-k 2 ×P Rd -C 2 +P e
wherein k is 1 And k 2 The droop coefficients of the first charging group and the second charging group are respectively. C 1 And C 2 Offset constants of the first charging group and the second charging group respectively, and in general, C can be considered as 1 ＝C 2 In other words, the charging group with the larger offset has a lower priority, that is, the charging group with the larger offset should have a relatively lower charging order. K is different due to the different adjustable resources of the first charging group and the second charging group, i.e. the different power resource data 1 And k 2 May not be equal.
When each charging group is adjusted, the specific calculation formula is as follows:
ΔP 1-ch ＝-k 1 ×ΔP
ΔP 2-ch ＝-k 2 ×ΔP
when the power load of the residential electricity changes by delta P, each charging group is adjusted according to the droop coefficient, and the power load of the first charging group is adjusted from P 1 Change to P 1’ The power load of the second charging group is from P 2 Change to P 2’ The adjusted total power load still satisfies the constraint relationship.
Optionally, the charging power adjusting method further includes: and if the second controller is detected to be offline, stopping calculating the droop coefficient of the charging group corresponding to the second controller.
It should be noted that, if the first controller does not receive a signal sent by a second charger over a preset time period, it may be considered that the second controller is offline. The first controller shifts the second controller and the charging group corresponding to the second controller out of the calculation sequence of the droop coefficient, and optionally, even if the second controller sends the power resource data and the charging data before, the calculation is not performed on the second controller, and only the charging group corresponding to the second controller on line is subjected to the update calculation of the droop coefficient. The off-line second controller and the charging group corresponding to the off-line second controller cannot receive the signal sent by the first controller, a certain power load still exists in the charging group corresponding to the off-line second controller, the whole charging power regulating system can be regarded as a component of the power load of residential electricity, and when the charging group corresponding to the off-line second controller is not used for regulating, the influence of the power load of the off-line group is considered, so that the total power load of the transformer can still be guaranteed to operate in a constrained state.
Optionally, the sum of the droop coefficients corresponding to the plurality of charging groups is 1.
The total vertical lines are the superposition of all the vertical lines, the total droop coefficient is also the sum of all the droop coefficients, and the value of the total droop coefficient k is constantly 1 in the calculation process.
In the calculation process, the following calculation relationship is also satisfied:
P tol-ch ＝P 1-ch +P 2-ch
k 1 +k 2 ＝1
according to this method, when there are n charge groups, the following relationship is satisfied:
Figure BDA0002396708110000111
wherein k is i Refers to the droop coefficient, P, of the ith charging group i-ch Is the power load of the ith charging group, C i Is the offset constant for the ith group. The above formula can beThe droop control algorithm in the embodiment of the invention.
In addition, the first controller periodically calculates the droop control coefficient of each charging group according to the operation data of each charging group, and then sends the droop control coefficient to each charging group, and each charging group adjusts the charging power according to the droop line of each charging group. On the basis of meeting the droop control theory, the droop coefficient is continuously updated by the whole system so as to adapt to the randomness of charging units and the change of the required battery power of the charging units in the charging process, and therefore, the charging power adjusting method provided by the embodiment of the invention has strong overall adaptability and stability.
Optionally, the method further comprises: receiving an adjusting instruction sent by a remote background system, wherein the adjusting instruction is used for adjusting total load data of the transformer; the remote background system is used for controlling the first controller.
It should be noted that, when the first controller is connected to the remote background system (which may be a background system with a power dispatching function), if the remote background system issues a load constraint limit to the first controller, and the limit is lower than the rated power of the transformer, that is, when the remote background system requires that the transformer temporarily operate at a lower load level, the first controller may change the value of the offset constant C to enable P to be lower than the load constraint limit, that is, the offset constant C is equal to the value of the offset constant C e -C≤P dispath 。
Wherein, P dispath Is the upper operating power limit required by the grid. After the adjustment, the total power load P of the charging group tol-ch The whole droop line of the transformer is translated downwards, and the whole charging power regulating system can regulate the total power load of the transformer to the load level of the upper limit of the operation power required by the power grid.
The charging power adjusting method provided by the embodiment of the invention can be accessed to more charging stations, and the capability of participating in larger-range coordinated dispatching of a power grid is improved.
Optionally, the method further comprises: and transmitting the total load data of the transformer to a remote background system.
It should be noted that, when the total load data of the transformer changes, the total load data of the transformer can be sent to the remote background system, and the remote background system can display the total load data of the transformer by connecting the display device, or send the total load data to a terminal of a worker for display, so that the worker can know the working condition of the transformer in time.
Fig. 5 is a flowchart illustrating a charging power adjustment method applied to a second controller according to an embodiment of the present invention, referring to fig. 5, the method is applied to the second controller in the charging adjustment system, and the method includes:
s210: and sending the power resource data and the charging data of the connected charging group to the first controller.
S220: and receiving total load data of the transformer sent by the first controller, and calculating a droop coefficient corresponding to the obtained charging group according to the power resource data and the charging data.
S230: and acquiring the target power adjusted by the charging group according to the droop coefficient and the charging data corresponding to the charging group by adopting a droop control algorithm corresponding to the charging group.
The specific implementation method can refer to the foregoing embodiments, and details are not repeated herein.
According to the charging power adjusting method provided by the embodiment of the invention, the total load data of the transformer and the droop coefficient corresponding to each charging group can be calculated according to the electrical data, the power resource data and the charging data, the power of the corresponding charging group can be adjusted according to the droop control algorithm, the droop coefficient and the charging data corresponding to the charging group, and the equipment utilization rate and the operation safety of a power system can be improved.
Optionally, the method further comprises: and receiving a load scheduling instruction sent by a remote background system, wherein the load scheduling instruction is used for indicating and adjusting a constant in the droop control algorithm.
Optionally, the method further comprises: the registration information is sent to the first controller.
Optionally, an embodiment of the present invention further provides a charging power adjustment system, where the system includes: the transformer is in communication connection with the first controller through the acquisition device, each charging group is in communication connection with the corresponding second controller, and the first controller is in communication connection with the second controllers.
The first controller is used for executing the method for adjusting the charging power applied to the first controller; the second controller is configured to perform the above-described method of charge power adjustment applied to the second controller.
According to the charging power adjusting system provided by the embodiment of the invention, the preset droop algorithm can be adopted, the total load data of the transformer and the droop coefficient corresponding to each charging group are calculated according to the electrical data, the power resource data and the charging data, the power of the corresponding charging group can be adjusted according to the total load data of the transformer and the droop coefficient corresponding to each charging group, and the equipment utilization rate and the operation safety of the power system can be improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A charging power regulation method is applied to a first controller in a charging regulation system, and the charging regulation system comprises: the transformer is in communication connection with the first controller through the acquisition device, each charging group is in communication connection with the corresponding second controller, and each charging group comprises 1 or more charging terminals; the first controller is respectively connected with a plurality of the second controllers in a communication mode, and the method comprises the following steps:
acquiring the electrical data of the transformer acquired by the acquisition device;
respectively receiving power resource data and charging data of each charging group sent by a plurality of second controllers; the power resource data represent the proportion relation among the power loads of the charging groups and represent the number of the resource data which can be called of the charging groups; when the power is down-regulated, the charging unit reaches the minimum charging power, and the charging unit becomes an unadjustable resource; when the power is adjusted up, the charging unit reaches the maximum power, and the charging unit becomes an unadjustable resource;
calculating total load data of a transformer and droop coefficients corresponding to the charging groups according to the electrical data, the power resource data and the charging data by adopting a preset droop algorithm; the droop coefficient corresponding to the charging group is a coefficient representing a relationship between a power load of the charging group and a power load of residential electricity; the first controller obtains the droop coefficient corresponding to each charging group according to periodic calculation of running data of each charging group, and the charging groups continuously update the droop coefficient;
sending the total load data of the transformer and the droop coefficient corresponding to each charging group to the second controller, so that the second controller adjusts the power corresponding to the charging group according to the total load data of the transformer and the droop coefficient corresponding to each charging group;
adjusting the power corresponding to the charging groups according to the total load data of the transformer and the droop coefficients corresponding to the charging groups comprises: determining a down-plumb line according to the droop coefficient and the total load data of the transformer; and adjusting the power of the charging group downwards or upwards according to the corresponding relation between the total load data of the transformer and the vertical line.
2. The method of claim 1, wherein before said separately receiving power resource data and charging data for each of said charging groups sent by a plurality of said second controllers, further comprising:
receiving registration information sent by the second controller;
and finishing the registration of the second controller according to the registration information.
3. The method of claim 1, wherein the method further comprises:
and if the second controller is detected to be offline, stopping calculating the droop coefficient of the charging group corresponding to the second controller.
4. The method of claim 1, wherein a sum of droop coefficients for a plurality of the charging groups is 1.
5. The method of claim 1, wherein the method further comprises:
receiving an adjusting instruction sent by a remote background system, wherein the adjusting instruction is used for adjusting total load data of a transformer; the remote background system is used for controlling the first controller.
6. The method of claim 1, wherein the method further comprises:
and sending the total load data of the transformer to a remote background system.
7. A charging power regulation method is applied to a second controller in a charging regulation system, and the charging regulation system comprises the following steps: the system comprises a first controller, a collecting device, a transformer, a plurality of charging groups and a plurality of second controllers, wherein the transformer is in communication connection with the first controller through the collecting device, each charging group is in communication connection with the corresponding second controller, the first controller is in communication connection with the plurality of second controllers, and the method comprises the following steps:
sending power resource data and charging data of the connected charging group to the first controller; the power resource data represent the proportion relation among the power loads of the charging groups and represent the number of the resource data which can be called of the charging groups; when the power is down-regulated, the charging unit reaches the minimum charging power, and the charging unit becomes an unadjustable resource; when the power is adjusted upwards, the charging unit reaches the maximum power, and the charging unit becomes an unadjustable resource;
receiving total load data of the transformer sent by the first controller and a droop coefficient corresponding to the charging group obtained by calculation according to the power resource data and the charging data; the droop coefficient corresponding to the charging group is a coefficient representing the relationship between the power load of the charging group and the power load of the residential electricity; the first controller obtains the droop coefficient corresponding to each charging group according to the periodic calculation of the running data of each charging group, and the charging groups continuously update the droop coefficient;
acquiring the target power adjusted by the charging group according to the droop coefficient and the charging data corresponding to the charging group by adopting a droop control algorithm corresponding to the charging group;
adjusting the power corresponding to the charging groups according to the total load data of the transformer and the droop coefficients corresponding to the charging groups comprises: determining a down-plumb line according to the droop coefficient and the total load data of the transformer; and adjusting the power of the charging group downwards or upwards according to the corresponding relation between the total load data of the transformer and the vertical line.
8. The method of claim 7, wherein the method further comprises:
and receiving a load scheduling instruction sent by a remote background system, wherein the load scheduling instruction is used for indicating to adjust a constant in the droop control algorithm.
9. The method of claim 7, wherein the method further comprises:
sending registration information to the first controller.
10. A charging power regulation system, comprising: the transformer is in communication connection with the first controller through the acquisition device, each charging group is in communication connection with the corresponding second controller, and the first controller is in communication connection with the second controllers;
the first controller for performing the method of any one of claims 1-6; the second controller is configured to perform the method of any of claims 7-9.
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