Charging mode selection method and apparatus, storage medium, and electronic device

Abstract

The application provides a charging mode selection method and device, a storage medium and electronic equipment, which can acquire current topology information of a power grid to which a charging pile belongs, generate a target fault set according to the topology information, determine the vulnerability of each tie line according to the risk value of each fault in the target fault set and the potential of each tie line under each fault, the tie line being used to provide electric energy for the charging pile, calculate the sensitivity of each charging pile according to the vulnerability of each tie line, the sensitivity representing the sensitivity degree of the active perturbation of the charging pile to the safe and stable operation of a power system, select one of a first charging mode and a second charging mode as the current charging mode of the charging pile based on the sensitivity of the charging pile, and the charging speed of the first charging mode is less than the charging speed of the second charging mode. The application can realize good operation of the charging pile under the premise of effectively guaranteeing the safe and stable operation of the system.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, and in particular to a charging mode selection method, apparatus, storage medium, and electronic device. Background Technology

[0002] In recent years, with the rapid growth in the number of electric vehicles and other electrical devices, the disorderly charging behavior of a large number of electrical devices can easily lead to problems such as low grid voltage and line congestion, thereby affecting the operational stability of the power system. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a charging mode selection method, device, storage medium, and electronic device that can ensure the stable operation of the power system. The specific solution is as follows:

[0004] A charging mode selection method, comprising:

[0005] Obtain the current topology information of the power grid to which the charging pile belongs;

[0006] Generate a target fault set based on the topology information;

[0007] Based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault, the vulnerability of each tie line is determined, and the tie line is used to provide power to the charging pile.

[0008] The sensitivity of the charging pile is calculated based on the vulnerability of each of the aforementioned tie lines; the sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the safe and stable operation of the power system.

[0009] Based on the sensitivity of the charging pile, one of the first charging mode and the second charging mode is selected as the current charging mode of the charging pile, and the charging speed of the first charging mode is less than the charging speed of the second charging mode.

[0010] Optionally, the method described above includes generating a target fault set based on the topology information, comprising:

[0011] The topology information is analyzed to obtain multiple alternative faults;

[0012] Based on the probability of occurrence of each candidate fault, at least one fault is selected from the candidate faults.

[0013] The selected faults are combined into a target fault set.

[0014] Optionally, the method described above includes determining the vulnerability of each tie line based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault, wherein the tie line is used to provide power to the charging pile, comprising:

[0015] Based on each fault in the target fault set, a transient power angle stability analysis is performed to obtain the potential energy of each tie line under each fault.

[0016] The vulnerability of each of the said links is calculated based on the risk value of each fault and the potential energy of each of the said links under each said fault.

[0017] Optionally, in the above method, the step of performing transient power angle stability analysis based on each fault in the target fault set to obtain the potential energy of each tie line under each fault includes:

[0018] Based on the topology information and each fault in the target fault set, transient power angle stability analysis is performed to obtain, under each fault, the first phase angle difference, the second phase angle difference, the first active power flow, and the second active power flow corresponding to each tie line. The first phase angle difference is the phase angle difference of the tie line in a stable equilibrium state after the fault occurs; the second phase angle difference is the phase angle difference of the tie line in an unstable equilibrium state after the fault occurs; the first active power flow is the active power flow of the tie line during the fault evolution process; and the second active power flow is the active power flow of the tie line relative to the stable equilibrium state after the fault occurs.

[0019] Based on the first phase angle difference, second phase angle difference, first active power flow, and second active power flow corresponding to each tie line under each fault, the potential energy of each tie line under each fault is calculated.

[0020] Optionally, in the above method, calculating the sensitivity of the charging pile based on the vulnerability of each of the aforementioned connection lines includes:

[0021] Determine the electrical distance between the charging pile and the receiving end node of each of the connecting lines;

[0022] The sensitivity of the charging pile is calculated based on the fragility of each of the aforementioned connecting lines and the electrical distance between the charging pile and the receiving end node of each of the aforementioned connecting lines.

[0023] Optionally, in the above method, selecting one of a first charging mode and a second charging mode as the current charging mode for the charging pile based on its sensitivity includes:

[0024] If the sensitivity of the charging pile is greater than a preset sensitivity threshold, the first charging mode is selected as the current charging mode of the charging pile.

[0025] If the sensitivity of the charging pile is not greater than a preset sensitivity threshold, the second charging mode is selected as the current charging mode of the charging pile.

[0026] Optionally, after selecting one of the first charging mode and the second charging mode as the current charging mode of the charging pile, the above method further includes:

[0027] Update the current topology information of the power grid;

[0028] A new target fault set is generated based on the updated topology information;

[0029] Based on the risk value of each fault in the new target fault set, and the potential energy of each tie line under each fault in the new target fault set, the vulnerability of each tie line is re-determined.

[0030] Based on the redefined vulnerability of each of the aforementioned connecting lines, the new sensitivity of the charging pile is calculated;

[0031] Based on the new sensitivity of the charging pile, one of the first charging mode and the second charging mode is reselected as the current charging mode of the charging pile.

[0032] A charging mode selection device, comprising:

[0033] The acquisition unit is used to acquire the current topology information of the power grid to which the charging pile belongs;

[0034] The generation unit is used to generate a target fault set based on the topology information;

[0035] The determining unit is used to determine the vulnerability of each of the following communication lines based on the risk value of each fault in the target fault set and the potential energy of each communication line under each fault, wherein the communication line is used to provide power to the charging pile.

[0036] The calculation unit is used to calculate the sensitivity of the charging pile based on the vulnerability of each of the aforementioned tie lines; the sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the safe and stable operation of the power system.

[0037] The selection unit is used to select one of a first charging mode and a second charging mode as the current charging mode of the charging pile based on the sensitivity of the charging pile, wherein the charging speed of the first charging mode is less than the charging speed of the second charging mode.

[0038] A storage medium includes storage instructions, wherein, when the instructions are executed, the device in which the storage medium resides executes the charging mode selection method described above.

[0039] An electronic device includes a memory and one or more instructions, wherein one or more instructions are stored in the memory and configured to be executed by one or more processors as described above for the charging mode selection method.

[0040] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0041] This invention provides a charging mode selection method, apparatus, storage medium, and electronic device. First, a target fault set is generated based on the topology information. Then, based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault, the vulnerability of each tie line is determined. The tie lines are used to provide power to the charging pile. Based on the vulnerability of each tie line, the sensitivity of the charging pile is calculated. The sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the safe and stable operation of the power system. Based on the sensitivity of the charging pile, one of a first charging mode and a second charging mode is selected as the current charging mode for the charging pile, where the charging speed of the first charging mode is less than that of the second charging mode. By applying the method provided by this invention, the charging mode selected for the charging pile based on its sensitivity can avoid problems such as low grid voltage and line congestion caused by disordered charging of electrical equipment. This ensures the safe and stable operation of the system while achieving good operation of the charging pile. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 A flowchart of a charging mode selection method provided in an embodiment of the present invention;

[0044] Figure 2 A flowchart illustrating the process of determining the vulnerability of each interconnecting line of a charging station, provided as an embodiment of the present invention;

[0045] Figure 3 A flowchart illustrating a process for obtaining the potential energy of a tie line, provided as an embodiment of the present invention;

[0046] Figure 4 A flowchart illustrating the process of calculating the sensitivity of a charging pile, provided as an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of a charging mode selection device provided in an embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention;

[0049] Figure 7 This is a flowchart illustrating a charging mode selection process provided in an embodiment of the present invention. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] In recent years, with the rapid growth in the number of electric vehicles and other electrical devices, the disorderly charging behavior of a large number of electrical devices can easily lead to problems such as low grid voltage and line congestion, thereby affecting the operational stability of the power system.

[0053] Based on this, embodiments of the present invention provide a charging mode selection method, which can be applied to electronic devices, and the flowchart of the method is shown below. Figure 1 As shown, it specifically includes:

[0054] S101: Obtain the current topology information of the power grid to which the charging pile belongs.

[0055] In this embodiment, the topology information includes the distribution and connection status of each node and each line in the power grid. For example, the distribution and connection status of charging piles and tie lines in the power grid can be recorded.

[0056] In this embodiment, the number of charging piles can be one or more.

[0057] S102: Generate a target fault set based on the topology information.

[0058] In this embodiment, the faults in the target fault set can be obtained by analyzing the topology information. The target fault set includes multiple anticipated faults, which can be various line faults, equipment faults, etc. in the power grid.

[0059] S103: Based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault, determine the vulnerability of each tie line, which is used to provide power to the charging pile.

[0060] In this embodiment, the risk value of each fault represents the minimum control cost required to restore stability to that fault, and this risk value can be measured in monetary terms.

[0061] Optionally, the vulnerability of each link indicates the degree of vulnerability of the link. The greater the vulnerability of the link, the more vulnerable it is, meaning it is more likely to be at risk.

[0062] S104: The sensitivity of the charging pile is calculated based on the vulnerability of each of the aforementioned tie lines; the sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the safe and stable operation of the power system.

[0063] In this embodiment, the greater the sensitivity of the charging pile, the more sensitive it is to the impact of the charging pile's active power perturbation on the safety and stability of the power system.

[0064] S105: Based on the sensitivity of the charging pile, select one of the first charging mode and the second charging mode as the current charging mode of the charging pile, wherein the charging speed of the first charging mode is less than the charging speed of the second charging mode.

[0065] Optionally, if there are multiple charging piles, one of the first charging mode and the second charging mode can be selected as the current charging mode for each charging pile based on its sensitivity.

[0066] In this embodiment, the first charging mode can be a slow charging mode, and the second charging mode can be a fast charging mode. The charging mode can be selected as the current charging mode of the charging pile according to the sensitivity of the charging pile, so as to avoid problems such as low grid voltage and line blockage caused by disordered charging of electrical equipment, and effectively ensure the stable operation of the power system.

[0067] In one embodiment of the present invention, based on the above implementation process, optionally, generating a target fault set according to the topology information includes:

[0068] The topology information is analyzed to obtain multiple alternative faults;

[0069] Based on the probability of occurrence of each candidate fault, at least one fault is selected from the candidate faults.

[0070] The selected faults are combined into a target fault set.

[0071] In this embodiment, the candidate faults can be obtained by analyzing topology information, which can determine the probability of occurrence of each candidate fault. Then, based on the probability of occurrence of each candidate fault and preset screening indicators, faults that can be used for transient stability analysis are selected, and the selected faults form a target fault set.

[0072] In some embodiments, at least one fault can be selected from the candidate faults according to the order of their probability of occurrence from largest to smallest to form a target fault set.

[0073] In one embodiment of the present invention, based on the above implementation process, optionally, the process of determining the vulnerability of each tie line according to the risk value of each fault in the target fault set and the potential energy of each tie line under each fault is as follows: Figure 2 As shown, it includes:

[0074] S201: Perform transient power angle stability analysis on each fault in the target fault set to obtain the potential energy of each tie line under each fault.

[0075] In this embodiment, power angle stability analysis can be performed by simulation based on topology information and each fault in the target fault set, and the potential energy of each tie line under each fault occurrence can be obtained based on the power angle stability analysis results.

[0076] S202: The vulnerability of each of the said links is calculated based on the risk value of each fault and the potential energy of each of the said links under each said fault.

[0077] In this embodiment, the vulnerability of tie line i is obtained by summing the indices composed of the potential energy of tie line i under fault j and the risk of fault j, as follows:

[0078]

[0079] Where j∈Ω represents fault j belonging to the expected fault set Ω, E i，j Let R be the potential energy of tie line i under fault j. j This represents the risk value of fault j.

[0080] In one embodiment of the present invention, based on the above implementation process, optionally, the process of performing transient power angle stability analysis on each fault in the target fault set to obtain the potential energy of each tie line under each fault is as follows: Figure 3 As shown, it includes:

[0081] S301: Perform transient stability simulation based on the topology information and each fault in the target fault set to obtain the first phase angle difference, second phase angle difference, first active power flow, and second active power flow corresponding to each tie line under each fault. The first phase angle difference is the phase angle difference of the tie line in a stable equilibrium state after the fault occurs; the second phase angle difference is the phase angle difference of the tie line in an unstable equilibrium state after the fault occurs; the first active power flow is the active power flow of the tie line during the fault evolution process; and the second active power flow is the active power flow of the tie line relative to the stable equilibrium state after the fault occurs.

[0082] S302: Based on the first phase angle difference, second phase angle difference, first active power flow and second active power flow corresponding to each tie line under each fault, calculate the potential energy of each tie line under each fault.

[0083] In this embodiment, the potential energy E of the tie line i under fault j is calculated. i,j The method is as follows:

[0084]

[0085] in, The first phase angle difference of tie line i under fault j. P represents the second phase angle difference of tie line i under fault j. i.j (u) is the first contributing current. The second active power flow of tie line i under fault j is relative to the stable equilibrium state after the fault.

[0086] Correspondingly, the vulnerability of contact line i can be specifically expressed as:

[0087]

[0088] In one embodiment of the present invention, based on the above implementation process, optionally, the process of calculating the sensitivity of the charging pile according to the vulnerability of each of the connecting lines of the charging pile is as follows: Figure 4 As shown, it includes:

[0089] S401: Determine the electrical distance between the charging pile and the receiving node of each of the connecting lines.

[0090] S402: The sensitivity of the charging pile is calculated based on the fragility of each of the said connecting lines and the electrical distance between the charging pile and the receiving end node of each of the said connecting lines.

[0091] In this embodiment, the sensitivity of charging pile k is calculated as follows:

[0092]

[0093] Among them, S k For the charging pile's k-sensitivity, D k.i S is the electrical distance between the charging pile k and the receiving end node of the tie line i. k The larger the value, the more sensitive the active power perturbation of the charging pile k is to the safety and stability of the power system.

[0094] In one embodiment of the present invention, based on the above implementation process, optionally, selecting one of a first charging mode and a second charging mode as the current charging mode of the charging pile based on the sensitivity of the charging pile includes:

[0095] If the sensitivity of the charging pile is greater than a preset sensitivity threshold, the first charging mode is selected as the current charging mode of the charging pile.

[0096] If the sensitivity of the charging pile is not greater than a preset sensitivity threshold, the second charging mode is selected as the current charging mode of the charging pile.

[0097] In this embodiment, the sensitivity of the charging pile can be compared with a preset sensitivity threshold. If the sensitivity is greater than the sensitivity threshold, the first charging mode is selected as the current charging mode of the charging pile; if the sensitivity is not greater than the sensitivity threshold, the second charging mode is selected as the current charging mode of the charging pile.

[0098] In one embodiment of the present invention, based on the above implementation process, optionally, after selecting one of the first charging mode and the second charging mode as the current charging mode of the charging pile, the method further includes:

[0099] Update the current topology information of the power grid;

[0100] A new target fault set is generated based on the updated topology information;

[0101] Based on the risk value of each fault in the new target fault set, and the potential energy of each tie line under each fault in the new target fault set, the vulnerability of each tie line is re-determined.

[0102] Based on the redefined vulnerability of each of the aforementioned connecting lines, the new sensitivity of the charging pile is calculated;

[0103] Based on the new sensitivity of the charging pile, one of the first charging mode and the second charging mode is reselected as the current charging mode of the charging pile.

[0104] In this embodiment, the current topology information and target fault set of the power grid can be updated according to a preset operating cycle. The size of the operating cycle can be set according to actual needs, for example, it can be set to 15 minutes.

[0105] and Figure 1 Corresponding to the method described above, this embodiment of the invention also provides a charging mode selection device for selecting a charging mode. Figure 1 The specific implementation of the method, the charging mode selection device provided in this embodiment of the invention, can be applied to electronic devices, and its structural schematic diagram is shown below. Figure 5 As shown, it specifically includes:

[0106] The acquisition unit 501 is used to acquire the current topology information of the power grid to which the charging pile belongs;

[0107] Generation unit 502 is used to generate a target fault set based on the topology information;

[0108] The determining unit 503 is used to determine the vulnerability of each of the following communication lines based on the risk value of each fault in the target fault set and the potential energy of each communication line under each fault. The communication line is used to provide power to the charging pile.

[0109] The calculation unit 504 is used to calculate the sensitivity of the charging pile based on the vulnerability of each of the aforementioned tie lines; the sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the stability of the power system operation.

[0110] Selection unit 505 is used to select one of a first charging mode and a second charging mode as the current charging mode of the charging pile based on the sensitivity of the charging pile, wherein the charging speed of the first charging mode is less than the charging speed of the second charging mode.

[0111] In one embodiment of the present invention, based on the above-described solution, specifically, the generation unit 502 includes:

[0112] The analysis subunit is used to analyze the topology information and obtain multiple alternative faults;

[0113] A selection subunit is used to select at least one fault from the candidate faults based on the fault occurrence probability of each candidate fault.

[0114] An execution unit is used to assemble the selected faults into a target fault set.

[0115] In one embodiment of the present invention, based on the above-described solution, specifically, the determining unit 502 includes:

[0116] The analysis subunit is used to perform transient power angle stability analysis based on each fault in the target fault set to obtain the potential energy of each tie line under each fault.

[0117] The first calculation subunit is used to calculate the vulnerability of the charging pile based on the risk value of each fault and the potential energy of each interconnect line under each fault.

[0118] In one embodiment of the present invention, based on the above-described scheme, specifically, the analysis subunit includes:

[0119] The analysis module is used to perform transient power angle stability analysis based on the topology information and each fault in the target fault set, to obtain the first phase angle difference, second phase angle difference, first active power flow, and second active power flow corresponding to each tie line under each fault. The first phase angle difference is the phase angle difference of the tie line in a stable equilibrium state after the fault occurs; the second phase angle difference is the phase angle difference of the tie line in an unstable equilibrium state after the fault occurs; the first active power flow is the active power flow of the tie line during the fault evolution process; and the second active power flow is the active power flow of the tie line relative to the stable equilibrium state after the fault occurs.

[0120] The calculation module is used to calculate the potential energy of each tie line under each fault based on the first phase angle difference, the second phase angle difference, the first active power flow, and the second active power flow corresponding to each tie line under each fault.

[0121] In one embodiment of the present invention, based on the above-described scheme, specifically, the computing unit includes:

[0122] A subunit is defined to determine the electrical distance between the charging pile and each receiving node of the connecting line;

[0123] The second calculation subunit is used to calculate the sensitivity of the charging pile based on the fragility of each of the said tie lines and the electrical distance between the charging pile and the receiving end node of each of the said tie lines.

[0124] In one embodiment of the present invention, based on the above-described solution, specifically, the selection unit includes:

[0125] The first selection subunit is used to select the first charging mode as the current charging mode of the charging pile when the sensitivity of the charging pile is greater than a preset sensitivity threshold.

[0126] The second selection subunit is used to select a second charging mode as the current charging mode of the charging pile when the sensitivity of the charging pile is not greater than a preset sensitivity threshold.

[0127] In one embodiment of the present invention, based on the above-described solution, specifically, the charging mode selection device further includes:

[0128] The update unit is used to update the current topology information and target fault set of the power grid, and return to the trigger determination unit 502 to generate the target fault set according to the topology information.

[0129] The specific principles and execution processes of each unit and module in the charging mode selection device disclosed in the above embodiments of the present invention are the same as those of the charging mode selection method disclosed in the above embodiments of the present invention. Please refer to the corresponding parts of the charging mode selection method provided in the above embodiments of the present invention, and they will not be repeated here.

[0130] This invention also provides a storage medium, which includes stored instructions, wherein when the instructions are executed, the device containing the storage medium is controlled to perform the above-described charging mode selection method.

[0131] This invention also provides an electronic device, the structural schematic of which is shown below. Figure 6 As shown, it specifically includes a memory 601 and one or more instructions 602, wherein one or more instructions 602 are stored in the memory 601 and configured to be executed by one or more processors 603 to perform the following operations:

[0132] Obtain the current topology information of the power grid to which the charging pile belongs;

[0133] Generate a target fault set based on the topology information;

[0134] Based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault, the vulnerability of each tie line is determined, and the tie line is used to provide power to the charging pile.

[0135] The sensitivity of the charging pile is calculated based on the vulnerability of each of the aforementioned tie lines; the sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the safe and stable operation of the power system.

[0136] Based on the sensitivity of the charging pile, one of the first charging mode and the second charging mode is selected as the current charging mode of the charging pile, and the charging speed of the first charging mode is less than the charging speed of the second charging mode.

[0137] The charging mode selection method provided in this embodiment of the invention can be applied to scenarios where charging piles charge electric vehicles and other electrical equipment. See [link / reference]. Figure 7 The flowchart below illustrates a charging mode selection process according to an embodiment of the present invention, specifically including the following steps:

[0138] Step 1: Periodically update the current power grid topology and the set of anticipated faults, and identify the charging piles currently in operation and the interconnecting lines that provide power to each charging pile.

[0139] Step 2: Perform transient stability simulation based on the anticipated fault set, and further combine each fault risk to obtain the vulnerability of each tie line under the current situation;

[0140] Step 3: Combine the electrical distance between each charging pile and each connecting line receiving node to obtain the sensitivity of each charging pile's active power perturbation to the safety and stability of the power system;

[0141] Step 4: Adaptively select one of the fast charging mode and slow charging mode as the charging mode for each charging pile based on its sensitivity; then return to step 1. This effectively ensures the operational stability of the power system.

[0142] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0143] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0144] For ease of description, the above apparatus is described by dividing it into various functional units. Of course, in implementing this invention, the functions of each unit can be implemented in one or more software and / or hardware components.

[0145] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

[0146] The charging mode selection method provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A charging mode selection method, characterized in that, include: Obtain the current topology information of the power grid to which the charging pile belongs; Generate a target fault set based on the topology information; Based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault, the vulnerability of each tie line is determined. The tie line is used to provide power to the charging pile. The vulnerability of the tie line is obtained by summing the potential energy of the tie line under each fault and the risk value of the fault, and is used to represent the vulnerability of the tie line. The sensitivity of the charging pile is calculated based on the vulnerability of each of the aforementioned connecting lines; The sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the safe and stable operation of the power system; Based on the sensitivity of the charging pile, one of the first charging mode and the second charging mode is selected as the current charging mode of the charging pile, and the charging speed of the first charging mode is less than the charging speed of the second charging mode.

2. The method according to claim 1, characterized in that, Generate a target fault set based on the topology information, including: The topology information is analyzed to obtain multiple alternative faults; Based on the probability of occurrence of each candidate fault, at least one fault is selected from the candidate faults. The selected faults are combined into a target fault set.

3. The method according to claim 1, characterized in that, The vulnerability of each tie line is determined based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault. The tie line is used to provide power to the charging pile, including: Based on each fault in the target fault set, a transient power angle stability analysis is performed to obtain the potential energy of each tie line under each fault. The vulnerability of each of the said links is calculated based on the risk value of each fault and the potential energy of each of the said links under each said fault.

4. The method according to claim 3, characterized in that, The step of performing transient power angle stability analysis based on each fault in the target fault set to obtain the potential energy of each tie line under each fault includes: Based on the topology information and each fault in the target fault set, transient power angle stability analysis is performed to obtain, under each fault, the first phase angle difference, the second phase angle difference, the first active power flow, and the second active power flow corresponding to each tie line. The first phase angle difference is the phase angle difference of the tie line in a stable equilibrium state after the fault occurs; the second phase angle difference is the phase angle difference of the tie line in an unstable equilibrium state after the fault occurs; the first active power flow is the active power flow of the tie line during the fault evolution process; and the second active power flow is the active power flow of the tie line relative to the stable equilibrium state after the fault occurs. Based on the first phase angle difference, second phase angle difference, first active power flow, and second active power flow corresponding to each tie line under each fault, the potential energy of each tie line under each fault is calculated.

5. The method according to claim 1, characterized in that, The process of calculating the sensitivity of the charging pile based on the vulnerability of each of the aforementioned connection lines includes: Determine the electrical distance between the charging pile and the receiving end node of each of the connecting lines; The sensitivity of the charging pile is calculated based on the fragility of each of the aforementioned connecting lines and the electrical distance between the charging pile and the receiving end node of each of the aforementioned connecting lines.

6. The method according to claim 1, characterized in that, The step of selecting one of a first charging mode and a second charging mode as the current charging mode for the charging pile based on its sensitivity includes: If the sensitivity of the charging pile is greater than a preset sensitivity threshold, the first charging mode is selected as the current charging mode of the charging pile. If the sensitivity of the charging pile is not greater than a preset sensitivity threshold, the second charging mode is selected as the current charging mode of the charging pile.

7. The method according to claim 1, characterized in that, After selecting one of the first charging mode and the second charging mode as the current charging mode of the charging pile, the method further includes: Update the current topology information of the power grid; A new target fault set is generated based on the updated topology information; Based on the risk value of each fault in the new target fault set, and the potential energy of each tie line under each fault in the new target fault set, the vulnerability of each tie line is re-determined. Based on the redefined vulnerability of each of the aforementioned connecting lines, the new sensitivity of the charging pile is calculated; Based on the new sensitivity of the charging pile, one of the first charging mode and the second charging mode is reselected as the current charging mode of the charging pile.

8. A charging mode selection device, characterized in that, include: The acquisition unit is used to acquire the current topology information of the power grid to which the charging pile belongs; The generation unit is used to generate a target fault set based on the topology information; The determining unit is used to determine the vulnerability of each of the following: based on the risk value of each fault in the target fault set and the potential energy of each tie line under each fault, the tie line is used to provide power to the charging pile, and the vulnerability of the tie line is obtained by summing the index composed of the potential energy of the tie line under each fault and the risk value of the fault, which is used to represent the vulnerability of the tie line. A calculation unit is used to calculate the sensitivity of the charging pile based on the fragility of each of the aforementioned connecting lines; The sensitivity characterizes the degree to which the active power perturbation of the charging pile affects the safe and stable operation of the power system; The selection unit is used to select one of a first charging mode and a second charging mode as the current charging mode of the charging pile based on the sensitivity of the charging pile, wherein the charging speed of the first charging mode is less than the charging speed of the second charging mode.

9. A storage medium, characterized in that, The storage medium includes storage instructions, wherein, when the instructions are executed, the device containing the storage medium is controlled to perform the charging mode selection method as described in any one of claims 1 to 7.

10. An electronic device, characterized in that, It includes a memory and one or more instructions, wherein one or more instructions are stored in the memory and configured to be executed by one or more processors as described in any one of claims 1 to 7.

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