CN108233365B - Charging station networking control method and device - Google Patents
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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
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Abstract
The invention discloses a charging station networking control method and device. The method comprises the following steps: determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected; establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load; after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load; and determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value. According to the invention, the effect that the influence of the electricity consumption peak of the charging station on the stability of the power grid is improved is achieved.
Description
Technical Field
The invention relates to the field of power grids, in particular to a charging station networking control method and device.
Background
The direct current charger of the quick charging station has high charging power and large daily load fluctuation, so that the voltage deviation calculation is carried out according to relevant regulations and according to actual conditions and relevant parameters before the quick charging station is connected into a power grid, the influence possibly generated on the operation reliability of the power grid after the quick charging station is operated is analyzed and researched, and technical measures for ensuring the coordinated development of the quick charging station and the power grid are provided so as to ensure the safe and stable operation of a power system after the quick charging station is connected into the power grid.
The peak power is very big when electric automobile charges fast, and electric automobile charging load has great randomness in the distribution in time moreover, begins to charge at the original peak load period of system simultaneously when a large amount of electric automobile, and charging load and other loads stack of system cause the peak to add on the peak, influence distribution system's normal operating, still can reduce the life-span of equipment.
Aiming at the problem that the power consumption peak of a charging station influences the stability of a power grid in the related art, an effective solution is not provided at present.
Disclosure of Invention
The invention mainly aims to provide a charging station networking control method and a charging station networking control device, so as to solve the problem that the power consumption peak of a charging station affects the stability of a power grid.
In order to achieve the above object, according to one aspect of the present invention, there is provided a charging station networking control method, including: determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected; establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load; after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load; and determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value.
Further, under the condition that the voltage deviation of the networked bus is larger than the preset threshold value, the bus is not networked.
Further, the method further comprises: establishing a relation curve between the deviation of the bus voltage of the power distribution network and the energy storage capacity of the charging station; and determining the energy storage capacity of the current charging station according to the relation curve and the given bus voltage deviation.
Further, determine notThe deviation of distribution network busbar voltage before and after the same peak load is connected includes: by the formula: voltage deviation of (V-V)N)/VNX 100% calculating the deviation of the bus voltage, where V is the actual voltage of the node and VNIs the nominal voltage of the node.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a charging station networking control apparatus, including: the first determining unit is used for determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected; the first establishing unit is used for establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load; the second determining unit is used for determining the bus voltage deviation after networking according to the current peak load after receiving the networking request; and the networking unit is used for determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value.
Further, the networking unit is further configured to: and under the condition that the voltage deviation of the networked bus is greater than the preset threshold value, the bus is not networked.
Further, the apparatus further comprises: the third establishing unit is used for establishing a relation curve between the deviation of the bus voltage of the power distribution network and the energy storage capacity of the charging station; and the fourth determining unit is used for determining the energy storage capacity of the current charging station according to the relation curve and the given bus voltage deviation.
Further, the first determination unit includes: by the formula: voltage deviation of (V-V)N)/VNX 100% calculating the deviation of the bus voltage, where V is the actual voltage of the node and VNIs the nominal voltage of the node.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a storage medium including a stored program, wherein when the program runs, an apparatus where the storage medium is located is controlled to execute the charging station networking control method according to the present invention.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a processor for executing a program, wherein the program executes the charging station networking control method according to the present invention.
The method comprises the steps of determining the deviation of bus voltage of the power distribution network before and after different peak loads are connected; establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load; after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load; under the condition that the bus voltage deviation after networking is less than or equal to the preset threshold value, the networking is determined, the problem that the charging station power consumption peak influences the stability of a power grid is solved, and the effect that the charging station power consumption peak influences the stability of the power grid is further achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a charging station networking control method according to an embodiment of the invention;
FIG. 2 is a wiring diagram of an IEEE33 node power distribution system according to an embodiment of the invention;
FIG. 3 is a graph of voltage deviation versus energy storage capacity according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a charging station networking control device according to an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a charging station networking control method.
Fig. 1 is a flowchart of a charging station networking control method according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
step S102: determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected;
step S104: establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load;
step S106: after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load;
step S108: and determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value.
The embodiment adopts the method that the deviation of the bus voltage of the power distribution network before and after different peak loads are connected is determined; establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load; after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load; under the condition that the bus voltage deviation after networking is less than or equal to the preset threshold value, the networking is determined, the problem that the charging station power consumption peak influences the stability of a power grid is solved, and the effect that the charging station power consumption peak influences the stability of the power grid is further achieved.
Optionally, under the condition that the voltage deviation of the networked bus is greater than a preset threshold, the bus is not networked.
Optionally, a relation curve between the deviation of the bus voltage of the power distribution network and the energy storage capacity of the charging station is established; and determining the energy storage capacity of the current charging station according to the relation curve and the given bus voltage deviation.
Optionally, determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected includes: by the formula: voltage deviation of (V-V)N)/VNX 100% calculating the deviation of the bus voltage, where V is the actual voltage of the node and VNIs the nominal voltage of the node.
The embodiment of the present invention also provides a preferred embodiment, and the following describes the technical solution of the present invention with reference to the preferred embodiment.
The direct current charger of the quick charging station has high charging power and large daily load fluctuation, so that the voltage deviation calculation is carried out according to relevant regulations and according to actual conditions and relevant parameters before the quick charging station is connected into a power grid, the influence possibly generated on the operation reliability of the power grid after the quick charging station is operated is analyzed and researched, and technical measures for ensuring the coordinated development of the quick charging station and the power grid are provided so as to ensure the safe and stable operation of a power system after the quick charging station is connected into the power grid.
The peak power is very big when electric automobile charges fast, and electric automobile charging load has great randomness in the distribution in time moreover, begins to charge at the original peak load period of system simultaneously when a large amount of electric automobile, and charging load and other loads stack of system cause the peak to add on the peak, influence distribution system's normal operating, still can reduce the life-span of equipment. The influence on the bus voltage of the distribution network is mainly analyzed.
The influence of the charging station load fluctuation on the power grid voltage is mainly used for analyzing the voltage deviation of a corresponding bus of the system, the voltage deviation is calculated according to the bus steady-state voltage obtained by simulation, and the specific formula is as follows:
where V is the actual voltage of the node, VNIs the nominal voltage of the node.
The distribution network model adopts an IEEE-33 node system. Fig. 2 is a wiring diagram of an IEEE33 node power distribution system according to an embodiment of the present invention, and the branch circuit parameters and bus load data are shown in table 1, where the bus load data are given as the total three-phase load of the bus. Reference value S of three-phase powerb10000kVA, reference value U of line voltagebNode 0 is the power supply node, the voltage per unit of this node is 1.0, and the voltage per unit of the other nodes is also 1, when it is 12.66 kV. According to the 33-node system diagram, the distance between the 7 nodes and the 0 node of the power supply node is proper, the 7 nodes are accessed into the charging station, and the 7 nodes are selected as the detection voltage deviation points. Except for 7 nodes, the loads of other nodes are constant power loads.
Table 133 node system parameters
The fast charging station is connected to the 7 nodes, a Matpower module in Matlab is selected to perform load flow calculation on the system, voltage deviation of each node before and after different peak loads of the charging station are connected is shown in a table 2, a relation curve of the voltage deviation and the energy storage capacity is shown in a graph 3, in the graph 3, a large square represents a voltage per unit value, and a small square represents a load peak value.
TABLE 2 Voltage migration of nodes before and after different peak loads of charging stations are connected
| Limiting peak power/ |
1000 | 900 | 800 | 700 | 600 | 500 | 400 |
| Peak Power/kW | 914 | 880 | 789 | 630 | 575 | 482 | 386 |
| Total cost/dollar | 5209 | 5199 | 5181 | 5119 | 5081 | 5048 | 4998 |
| Energy storage capacity/kWh | 221 | 255 | 346 | 505 | 560 | 653 | 749 |
| Voltage per unit value | 0.9213 | 0.9221 | 0.9241 | 0.9277 | 0.9289 | 0.931 | 0.9331 |
From the above curves, it can be known that the charging station has a large influence on the grid voltage after being connected to the system, and the lower the load peak value is, the smaller the voltage deviation is, and the voltage deviation standard stipulated by the country is: the deviation of the three-phase power supply voltage of 20kV or below is +/-7% of the nominal voltage, the per-unit value of the known voltage needs to be more than or equal to 0.93, namely the load peak value needs to be reduced to be less than 600kW, and then the energy storage capacity is configured according to the floor area of the power distribution capacity which can be provided by the quick charging station.
The energy storage system can be used for peak clipping and valley filling of the charging station, special charging and discharging control is performed on the energy storage system, the load peak value can be reduced, so that the power distribution capacity of the charging station is reduced, the construction cost of the charging station is also reduced, and on the other hand, the effect of stabilizing load fluctuation and reducing impact of quick charging on a power grid is achieved by reducing the load peak value; the operation cost of the charging station is reduced by utilizing the peak-valley time-of-use electricity price of the power grid, electricity is bought from the power grid and stored in the storage battery when the electricity price is in the valley, and the storage battery discharges electricity when the electricity price is in the peak so as to improve the operation economic benefit of the charging station; after the energy storage system is adopted, the load peak value of the charging station is reduced, the influence of the charging station accessing a power grid on the voltage deviation of the power grid node is reduced, and the power supply safety is improved.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
The embodiment of the invention provides a charging station networking control device, which can be used for executing the charging station networking control method of the embodiment of the invention.
Fig. 4 is a schematic diagram of a charging station networking control device according to an embodiment of the invention, as shown in fig. 4, the device includes:
the first determining unit 10 is used for determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected;
the first establishing unit 20 is used for establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load;
the second determining unit 30 is configured to determine a bus voltage deviation after networking according to a current peak load after receiving a networking request;
and the networking unit 40 is used for determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value.
Optionally, the networking unit 40 is further configured to: and under the condition that the voltage deviation of the networked bus is greater than a preset threshold value, the bus is not networked.
Optionally, the apparatus further comprises: the third establishing unit is used for establishing a relation curve between the deviation of the bus voltage of the power distribution network and the energy storage capacity of the charging station; and the fourth determining unit is used for determining the energy storage capacity of the current charging station according to the relation curve and the given bus voltage deviation.
Optionally, the first determining unit 10 is configured to: by the formula: voltage deviation of (V-V)N)/VNX 100% calculating the deviation of the bus voltage, where V is the actual voltage of the node and VNIs the nominal voltage of the node.
The charging station networking control device comprises a processor and a memory, wherein the first determining unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to one or more than one, and the influence of the electricity consumption peak of the charging station on the stability of the power grid is improved by adjusting the kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a storage medium having a program stored thereon, where the program, when executed by a processor, implements the charging station networking control method.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program executes the charging station networking control method when running.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps: determining the deviation of bus voltages of the power distribution network before and after different peak loads are connected; establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load; after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load; and determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected; establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load; after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load; and determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer readable media.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of an element by the phrase "comprising an … …" does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A charging station networking control method is characterized by comprising the following steps:
determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected;
establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load;
after receiving a networking request, determining the voltage deviation of the networked bus according to the current peak load;
determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value;
the method further comprises the following steps: establishing a relation curve between the deviation of the bus voltage of the power distribution network and the energy storage capacity of the charging station; and determining the energy storage capacity of the current charging station according to the relation curve and the given bus voltage deviation.
2. The method of claim 1,
and under the condition that the voltage deviation of the networked bus is greater than the preset threshold value, the bus is not networked.
3. The method of claim 1, wherein determining the deviation in the distribution network bus voltage before and after different peak load shedding comprises:
by the formula: voltage deviation of (V-V)N)/VNX 100% calculating the deviation of the bus voltage, where V is the actual voltage of the node and VNIs the nominal voltage of the node.
4. A charging station networking control device, comprising:
the first determining unit is used for determining the deviation of the bus voltage of the power distribution network before and after different peak loads are connected;
the first establishing unit is used for establishing a functional relation between the deviation of the bus voltage of the power distribution network and the peak load;
the second determining unit is used for determining the bus voltage deviation after networking according to the current peak load after receiving the networking request;
the networking unit is used for determining networking under the condition that the voltage deviation of the networked bus is less than or equal to a preset threshold value;
the device further comprises: the third establishing unit is used for establishing a relation curve between the deviation of the bus voltage of the power distribution network and the energy storage capacity of the charging station; and the fourth determining unit is used for determining the energy storage capacity of the current charging station according to the relation curve and the given bus voltage deviation.
5. The apparatus of claim 4, wherein the networking unit is further configured to:
and under the condition that the voltage deviation of the networked bus is greater than the preset threshold value, the bus is not networked.
6. The apparatus of claim 4, wherein the first determining unit is configured to:
by the formula: voltage deviation of (V-V)N)/VNX 100% calculating the deviation of the bus voltage, where V is the actual voltage of the node and VNIs the nominal voltage of the node.
7. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, the device where the storage medium is located is controlled to execute the charging station networking control method according to any one of claims 1 to 3.
8. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the charging station networking control method according to any one of claims 1 to 3 when running.
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| CN102361334A (en) * | 2011-10-17 | 2012-02-22 | 广东电网公司深圳供电局 | Photovoltaic energy storage electric automobile charging station system and method for switching state of energy storage system |
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| CN102361334A (en) * | 2011-10-17 | 2012-02-22 | 广东电网公司深圳供电局 | Photovoltaic energy storage electric automobile charging station system and method for switching state of energy storage system |
| EP2865558B1 (en) * | 2013-10-24 | 2016-12-28 | Volvo Car Corporation | Method and system for controlling charging of an energy storage device |
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