New energy power grid short-circuit current control method and device based on sensitivity index

Abstract

The present invention discloses a method and device for controlling short-circuit current in a new energy power grid based on a sensitivity index. The method comprises: calculating the short-circuit current of each node of the power grid to be analyzed based on a short-circuit current calculation data model, determining the short-circuit current exceeding stations in the power grid to be analyzed and the amount by which the short-circuit current exceeds the standard; blocking all new energy stations in the data model, calculating the short-circuit current level of the stations with the short-circuit current exceeding the standard after excluding the influence of the new energy stations; if the short-circuit current level exceeds the standard, blocking each new energy station in turn, calculating the amount by which the short-circuit current calculated value of the stations with the short-circuit current exceeding the standard is reduced after each new energy station is blocked; determining the sensitivity index of each new energy station; and adjusting the reactive power support coefficient of each new energy station based on the sensitivity index of each new energy station and the short-circuit current control sensitivity of the stations with the short-circuit current exceeding the standard to control the short-circuit current level of the stations with the short-circuit current exceeding the standard in the power grid to be analyzed.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more particularly to a method and device for controlling short-circuit current in a new energy power grid based on a sensitivity index. Background Art

[0002] In the operation of power systems, short-circuit faults are one of the most common faults. The short-circuit currents they generate can have serious impacts and consequences on the safe and stable operation of power systems. At present, my country's receiving-end power grids generally face the risk of excessive short-circuit currents. When the overall short-circuit current level of the power grid is low, the main focus of new equipment connected to the grid is its impact on the stability characteristics of the power grid, and its effect on increasing short-circuit current only requires a simple assessment. After the connection of new energy power generation equipment such as doubly fed, direct-drive wind turbines, and photovoltaics, they present voltage-controlled current source characteristics to the power grid, which will increase the short-circuit current level of the new energy power grid to a certain extent. As the short-circuit current level of the power grid gradually approaches or reaches the rated interrupting capacity of the switch, the impact of new equipment, especially new energy power generation equipment, on the short-circuit current after it is connected to the grid should be paid special attention to. How to solve the short-circuit current control of the power grid after the large-scale connection of new energy has become a technical problem that needs to be solved urgently. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a new energy power grid short-circuit current control method and device based on sensitivity indicators.

[0004] According to one aspect of the present invention, a new energy grid short-circuit current control method based on a sensitivity index is provided, comprising:

[0005] Calculate the short-circuit current of each node of the power grid to be analyzed based on the pre-established short-circuit current calculation data model of the power grid to be analyzed in the new energy station model, and determine the short-circuit current exceeding station of the power grid to be analyzed and the amount of the short-circuit current exceeding the standard;

[0006] Block all new energy stations in the data model and calculate the short-circuit current levels of stations with excessive short-circuit current after excluding the impact of new energy stations.

[0007] If the short-circuit current level exceeds the standard, each new energy station will be blocked in turn, and the reduction in the short-circuit current calculated value of the station with the short-circuit current exceeding the standard after the blocking of each new energy station will be calculated;

[0008] Determine the sensitivity index of each new energy station based on the ratio of the reduction in the calculated short-circuit current value of each new energy station to the short-circuit current excess at the station with the short-circuit current exceeding the standard;

[0009] Adjust the reactive power support coefficient of each renewable energy station based on its sensitivity index and the short-circuit current control sensitivity of stations with excessive short-circuit current.

[0010] The short-circuit current level of each new energy station with adjusted reactive support coefficient is controlled at the short-circuit current exceeding standard stations in the power grid to be analyzed.

[0011] Optionally, it also includes: if the short-circuit current level does not exceed the standard, the short-circuit current level is suppressed by adjusting the new energy station control adjustment.

[0012] Optionally, the reactive power support coefficient of each new energy station is adjusted according to the sensitivity index of each new energy station and the short-circuit current control sensitivity of the station where the short-circuit current exceeds the standard, including:

[0013] Determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 30%. If the sensitivity index S of the new energy station j is j If it is higher than 30%, adjust the reactive power support coefficient k of the new energy station j. T is 0.3;

[0014] If S j Less than or equal to 30%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 15%. If the sensitivity index S of the new energy station j is less than or equal to 30%, determine whether the sensitivity index S of the new energy station j is less than 15%. j If it is higher than 15%, the reactive power support coefficient k of the new energy station j is adjusted. T is 0.6;

[0015] If S j Less than or equal to 15%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 5%. If the sensitivity S of station j is less than 15%, determine whether the sensitivity S of each new energy station to the short-circuit current exceeding the standard station exceeds 5%. j If it is higher than 5%, adjust the reactive power support coefficient k of the new energy station j. T is 1.0;

[0016] If S j If it is less than or equal to 5%, it is determined that there is no need to adjust the reactive support coefficient k of the new energy station j T .

[0017] Optionally, the short-circuit current level control is performed on the short-circuit current exceeding-standard stations of the power grid to be analyzed according to each renewable energy station for which the reactive support coefficient is adjusted, including:

[0018] According to each renewable energy station with adjusted reactive power support coefficient, short-circuit current level control is performed on the short-circuit current exceeding standard stations of the power grid to be analyzed, and the short-circuit current calculated value of the short-circuit current exceeding standard stations is calculated;

[0019] Determine whether the calculated short-circuit current value exceeds the standard. If not, control the short-circuit current level of each renewable energy station in the analyzed power grid according to the adjusted reactive power support coefficient;

[0020] If the calculated short-circuit current value exceeds the standard, the reactive current limit value of all new energy stations with a sensitivity index greater than or equal to 5% of the short-circuit current control sensitivity will be adjusted to the preset value;

[0021] The short-circuit current level of each new energy station that adjusts the reactive current limit value is controlled at the short-circuit current exceeding the standard station in the power grid to be analyzed.

[0022] According to another aspect of the present invention, a new energy grid short-circuit current control device based on a sensitivity index is provided, comprising:

[0023] A first calculation module is used to calculate the short-circuit current of each node of the power grid to be analyzed based on the short-circuit current calculation data model of the power grid to be analyzed in the pre-established new energy station model, and determine the short-circuit current exceeding station of the power grid to be analyzed and the amount of the short-circuit current exceeding the standard;

[0024] The second calculation module is used to block all new energy stations in the data model and calculate the short-circuit current level of the stations with excessive short-circuit current after excluding the influence of the new energy stations;

[0025] The third calculation module is used to sequentially block each new energy station if the short-circuit current level exceeds the standard, and calculate the reduction in the short-circuit current calculated value of the station with the short-circuit current exceeding the standard after each new energy station is blocked;

[0026] A determination module, configured to determine the sensitivity index of each new energy station based on a ratio of a reduction in the short-circuit current calculated value of each new energy station and an excess short-circuit current at a station where the short-circuit current exceeds the standard;

[0027] An adjustment module is used to adjust the reactive support coefficient of each renewable energy station based on the sensitivity index of each renewable energy station and the short-circuit current control sensitivity of the station where the short-circuit current exceeds the standard;

[0028] The control module is used to control the short-circuit current level of the short-circuit current exceeding the standard site of the power grid to be analyzed according to each new energy station that adjusts the reactive support coefficient.

[0029] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute the method according to any one of the above aspects of the present invention.

[0030] According to another aspect of the present invention, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; and the processor for reading the executable instructions from the memory and executing the instructions to implement the method described in any one of the above aspects of the present invention.

[0031] Therefore, the present invention determines the short-circuit current-sensitive stations through sensitivity index calculation, and then utilizes the flexible control capability of new energy equipment to significantly reduce its short-circuit current contribution level by optimizing its control parameters related to short-circuit current contribution. By judging the sensitivity index of different new energy stations to the short-circuit current, and differentially adjusting the short-circuit current control parameters of the new energy stations in the fault vicinity, it is possible to provide a new technical means for the short-circuit current control of the new energy power grid, and ensure the safe and stable operation of a high-proportion new energy power grid. It provides support for the short-circuit current control of the new energy power grid and the optimization of the control strategy of the new energy station, and can provide a new technical means for the short-circuit current control of the new energy power grid, and ensure the safe and stable operation of a high-proportion new energy power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0033] Figure 1 1 is a flow chart of a new energy grid short-circuit current control method based on sensitivity indicators provided by an exemplary embodiment of the present invention;

[0034] Figure 2 This is another flow chart of a new energy grid short-circuit current control method based on sensitivity indicators provided by an exemplary embodiment of the present invention;

[0035] Figure 3 1 is a schematic structural diagram of a new energy grid short-circuit current control device based on a sensitivity index provided by an exemplary embodiment of the present invention;

[0036] Figure 4 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0037] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0038] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0039] Those skilled in the art will understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0040] It should also be understood that, in the embodiments of the present invention, “a plurality of” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0041] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0042] In addition, the term "and / or" in this invention merely describes an association relationship between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this invention generally indicates that the related objects are in an "or" relationship.

[0043] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced with each other. For the sake of brevity, they will not be described one by one.

[0044] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0045] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0046] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0047] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate in conjunction with numerous other general-purpose or specialized computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments, and / or configurations suitable for use with terminal devices, computer systems, servers, and other electronic devices include, but are not limited to, personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above.

[0049] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system-executable instructions (such as program modules) executed by a computer system. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked via a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media, including storage devices.

[0050] Exemplary Methods

[0051] Figure 1 This is a flow chart of a new energy grid short-circuit current control method based on sensitivity index provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the new energy grid short-circuit current control method 100 based on sensitivity index includes the following steps:

[0052] Step 101: Calculate the short-circuit current of each node of the power grid to be analyzed based on the pre-established short-circuit current calculation data model of the power grid to be analyzed in the new energy station model, and determine the short-circuit current exceeding stations and the amount of short-circuit current exceeding the standard in the power grid to be analyzed;

[0053] Step 102: Block all new energy stations in the data model and calculate the short-circuit current levels of stations with excessive short-circuit currents after excluding the influence of the new energy stations.

[0054] Step 103: If the short-circuit current level exceeds the standard, each new energy station is blocked in turn, and the amount of reduction in the short-circuit current calculated value for the station with the short-circuit current exceeding the standard after the blocking of each new energy station is calculated;

[0055] Step 104: determining a sensitivity index for each new energy station based on a ratio of a reduction in the short-circuit current calculated value of each new energy station to an excess short-circuit current at a station with excessive short-circuit current;

[0056] Step 105: Adjust the reactive power support coefficient of each new energy station according to the sensitivity index of each new energy station and the short-circuit current control sensitivity of the station with excessive short-circuit current;

[0057] Step 106 , controlling the short-circuit current level of the short-circuit current exceeding standard stations in the power grid to be analyzed according to the adjusted reactive power support coefficients of the new energy stations.

[0058] Specifically, the present invention addresses the problem of short-circuit current control in power grids after large-scale access to new energy sources, and proposes a new energy power grid short-circuit current control method based on sensitivity indicators, which provides support for new energy power grid short-circuit current control and optimization of new energy station control strategies. It can provide new technical means for new energy power grid short-circuit current control and ensure the safe and stable operation of power grids with a high proportion of new energy sources.

[0059] refer to Figure 2 As shown, the method includes the following steps:

[0060] Step 1: Establish a short-circuit current calculation data model for the power grid to be analyzed, including a new energy station model;

[0061] Step 2: Calculate the short-circuit current calculation data model established in step 1, calculate and analyze the short-circuit current of each node in the power grid, and identify the sites where the short-circuit current exceeds the standard and the amount of short-circuit current exceeding the standard Ik';

[0062] Step 3: Block the impact of all renewable energy stations on the short-circuit current in the data model, and calculate the short-circuit current level of the stations that exceed the standard after excluding the impact of renewable energy stations. Determine whether it exceeds the switch capacity limit. If it does not exceed the standard, then the solution of suppressing the short-circuit current level through renewable energy control adjustment is feasible, and go to step 4. If it still exceeds the standard, then the short-circuit current exceeding the standard is less correlated with the impact of renewable energy, and the method ends.

[0063] Step 4: Sequentially block the impact of each renewable energy station in the power grid to be studied on the short-circuit current calculation, and calculate the reduction in the short-circuit current calculated value of the exceeding station after the renewable energy station j is blocked. kj ;

[0064] Step 5: After the new energy station j is locked, the short-circuit current of the exceeding station is reduced by △I kj The short-circuit current exceeding the standard at the same site I k ', and use it as the sensitivity index S of the new energy station j j ;

[0065] Step 6: Determine in turn whether the sensitivity S of each new energy station to the short-circuit current control of the exceeding-standard station exceeds 30%. If the sensitivity S of station j is greater than 30%, j If it is higher than 30%, adjust the reactive power support coefficient k of the new energy station j. T is 0.3; if S j If it is less than or equal to 30%, go to step 7;

[0066] Step 7: Determine in turn whether the sensitivity S of each new energy station to the short-circuit current control of the exceeding-standard station exceeds 15%. If the sensitivity S of station j is greater than 15%, j If it is higher than 15%, the reactive power support coefficient k of the new energy station j is adjusted. T is 0.6; if S jIf it is less than or equal to 15%, go to step 8;

[0067] Step 8: Determine in turn whether the short-circuit current control sensitivity S of each new energy station to the excessive station exceeds 5%. If the sensitivity S of station j is greater than 5%, j If it is higher than 5%, adjust the reactive power support coefficient k of the new energy station j. T is 1.0; if S j If it is less than or equal to 5%, go to step 9;

[0068] Step 9: Complete all new energy station control parameters k T After adjustment, calculate the short-circuit current value of the exceeding station;

[0069] Step 10: Determine and adjust the control parameter k T Whether the calculated short-circuit current value of the later exceeding-standard station exceeds the switch capacity, if not, the method ends; if still exceeding the standard, go to step 11;

[0070] Step 11: Adjust the reactive current limit value of all new energy stations with a sensitivity index greater than or equal to 5% to 0.2pu;

[0071] Step 12: The method ends.

[0072] In addition, the above steps of the present invention are all operated based on PSD-SCCP short-circuit current engineering practical calculation software.

[0073] In one embodiment of the present invention, the applicability of the proposed method is analyzed using a domestic grid with a high proportion of renewable energy access as an example. In this example, there are five renewable energy stations with installed capacities of 100MVA, 300MVA, 300MVA, 200MVA, and 100MVA, respectively. There is one 220kV over-limit station with a calculated short-circuit current of 51.15kA. The switch capacity is limited to 50kA, resulting in an over-limit short-circuit current of Ik' = 1.15kA. The typical manufacturer value for the reactive power support coefficient of the renewable energy station is 1.5, and the typical value for the reactive current limiting coefficient is 1.0pu.

[0074] Taking the short-circuit current calculation program SCCP as an example, the implementation process of this patented method with the help of mainstream engineering practical calculation software is explained. In the SCCP short-circuit current calculation stability data, the stability model low-voltage ride-through reactive current control card LQ of the new energy station j is blocked in turn, ignoring the contribution of the new energy station j to the short-circuit current calculation of the exceeding station, and the reduction in the short-circuit current calculation value of the exceeding station after the LQ card is blocked is obtained. kj . And through △I kj and I k Calculate the sensitivity of new energy station j to the short-circuit current of the exceeding station. The formula is shown in 1:

[0075]

[0076] Table 1 Analysis of nodes with excessive short-circuit current in scheme 1

[0077] New Energy Station <![CDATA[△I k (kA)]]> Sensitivity S Station 1 0.31 26.96％ Station 2 0.85 73.91％ Station 3 0.97 84.35％ Station 4 0.32 27.83％ Station 5 0.05 4.35％

[0078] Through steps 1 to 9 of the present invention, the short-circuit current sensitivity of all new energy stations to the exceeding-standard stations is calculated, and the reactive power support coefficient of each new energy station is adjusted accordingly. The calculated short-circuit current value of the exceeding-standard station is reduced to 49.11kA, which is lower than the 50kA limit of the switch capacity of the station, achieving the high-proportion new energy power grid short-circuit current control target, proving the effectiveness of the new energy power grid short-circuit current control method based on sensitivity index proposed in the present invention.

[0079] Therefore, the present invention determines the short-circuit current-sensitive stations through sensitivity index calculation, and then utilizes the flexible control capability of new energy equipment to significantly reduce its short-circuit current contribution level by optimizing its control parameters related to short-circuit current contribution. By judging the sensitivity index of different new energy stations to the short-circuit current, and differentially adjusting the short-circuit current control parameters of the new energy stations in the fault vicinity, it is possible to provide a new technical means for the short-circuit current control of the new energy power grid, and ensure the safe and stable operation of a high-proportion new energy power grid. It provides support for the short-circuit current control of the new energy power grid and the optimization of the control strategy of the new energy station, and can provide a new technical means for the short-circuit current control of the new energy power grid, and ensure the safe and stable operation of a high-proportion new energy power grid.

[0080] Exemplary devices

[0081] Figure 3 FIG is a schematic diagram of a short-circuit current control device for a new energy grid based on a sensitivity index according to an exemplary embodiment of the present invention. Figure 3 As shown, the apparatus 300 includes:

[0082] A first calculation module 310 is configured to calculate the short-circuit current of each node of the power grid to be analyzed based on a pre-established short-circuit current calculation data model of the power grid to be analyzed in the new energy station model, and determine the nodes of the power grid to be analyzed where the short-circuit current exceeds the standard and the amount of the short-circuit current exceeding the standard;

[0083] The second calculation module 320 is used to block all new energy stations in the data model and calculate the short-circuit current level of the stations with excessive short-circuit current after excluding the influence of the new energy stations;

[0084] The third calculation module 330 is used to sequentially block each new energy station if the short-circuit current level exceeds the standard, and calculate the reduction in the short-circuit current calculated value of the station with the short-circuit current exceeding the standard after each new energy station is blocked;

[0085] A determination module 340 is configured to determine a sensitivity index for each new energy station based on a ratio of a reduction in the short-circuit current calculated value of each new energy station to an excess short-circuit current value at a station with excessive short-circuit current;

[0086] An adjustment module 350 is configured to adjust the reactive power support coefficient of each renewable energy station based on the sensitivity index of each renewable energy station and the short-circuit current control sensitivity of the station where the short-circuit current exceeds the standard;

[0087] The control module 360 ​​is used to control the short-circuit current level of the short-circuit current exceeding the standard site in the power grid to be analyzed according to each new energy station that adjusts the reactive power support coefficient.

[0088] Optionally, the device 300 further includes: a suppression module, configured to suppress the short-circuit current level by adjusting the new energy station control adjustment if the short-circuit current level does not exceed the standard.

[0089] Optionally, the adjustment module 350 includes:

[0090] The first adjustment submodule is used to determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 30%. If the sensitivity index S of the new energy station j is greater than 30%, j If it is higher than 30%, adjust the reactive power support coefficient k of the new energy station j. T is 0.3;

[0091] The second adjustment submodule is used for j Less than or equal to 30%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 15%. If the sensitivity index S of the new energy station j is less than or equal to 30%, determine whether the sensitivity index S of the new energy station j is less than 15%. j If it is higher than 15%, the reactive power support coefficient k of the new energy station j is adjusted. T is 0.6;

[0092] The third adjustment submodule is used for j Less than or equal to 15%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 5%. If the sensitivity S of station j is less than 15%, determine whether the sensitivity S of each new energy station to the short-circuit current exceeding the standard station exceeds 5%. j If it is higher than 5%, adjust the reactive power support coefficient k of the new energy station j. T is 1.0;

[0093] The judgment submodule is used if S j If it is less than or equal to 5%, it is determined that there is no need to adjust the reactive support coefficient k of the new energy station j T .

[0094] Optionally, the control module 360 ​​includes:

[0095] A calculation submodule is used to control the short-circuit current level of the short-circuit current exceeding the standard site of the power grid to be analyzed according to each new energy station for adjusting the reactive support coefficient, and calculate the short-circuit current calculated value of the short-circuit current exceeding the standard site;

[0096] The first control submodule is used to determine whether the calculated short-circuit current value exceeds the standard. If it does not exceed the standard, the short-circuit current level of the stations whose short-circuit current exceeds the standard in the power grid to be analyzed is controlled according to the reactive power support coefficient of each new energy station;

[0097] A fourth adjustment submodule is configured to adjust the reactive current limit values ​​of all new energy stations whose sensitivity index is greater than or equal to 5% of the short-circuit current control sensitivity to a preset value if the calculated short-circuit current value exceeds the standard;

[0098] The second control submodule is used to control the short-circuit current level of the short-circuit current exceeding the standard site of the power grid to be analyzed according to each new energy station adjusting the reactive current limit value.

[0099] Exemplary electronic devices

[0100] Figure 4 This is the structure of an electronic device provided by an exemplary embodiment of the present invention. Figure 4 As shown, the electronic device 40 includes one or more processors 41 and a memory 42 .

[0101] The processor 41 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0102] The memory 42 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may, for example, include read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 41 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may further include: an input device 43 and an output device 44, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0103] In addition, the input device 43 may also include, for example, a keyboard, a mouse, and the like.

[0104] The output device 44 can output various information to the outside. The output device 44 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0105] Of course, to simplify, Figure 4 Only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device may further include any other appropriate components according to specific application conditions.

[0106] Exemplary computer program products and computer-readable storage media

[0107] In addition to the above-mentioned methods and devices, an embodiment of the present invention may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to perform the steps of the method according to various embodiments of the present invention described in the above "Exemplary Method" section of this specification.

[0108] The computer program product may be written in any combination of one or more programming languages ​​to implement the operations of embodiments of the present invention, including object-oriented programming languages ​​such as Java, C++, and conventional procedural programming languages ​​such as C or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a stand-alone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0109] In addition, an embodiment of the present invention may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above "Exemplary Method" section of this specification.

[0110] The computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to a system, system or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0111] The basic principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in the present invention are merely illustrative and non-limiting, and should not be construed as necessarily possessed by each embodiment of the present invention. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, and are not intended to be limiting. These details do not necessarily limit the present invention to being implemented using these specific details.

[0112] Each embodiment in this specification is described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. References to the same or similar parts between the various embodiments are sufficient. For system embodiments, since they largely correspond to method embodiments, their description is relatively simple. For relevant parts, references to the description of the method embodiments are sufficient.

[0113] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "including," "comprising," "having," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0114] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above sequence of steps for the method is for illustration only, and the steps of the method of the present invention are not limited to the sequence specifically described above, unless otherwise specified. In addition, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present invention. Thus, the present invention also covers recording media that store programs for executing the method according to the present invention.

[0115] It should also be noted that, in the system, device and method of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. The above description of the disclosed aspects is provided to enable any technician in this field to make or use the present invention. Various modifications to these aspects will be very obvious to those skilled in the art, and the general principles defined here can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown here, but according to the widest scope consistent with the principles disclosed here and novel features.

[0116] The above description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A new energy power grid short-circuit current control method based on sensitivity index, characterized in that: include: Calculating the short-circuit current of each node of the power grid to be analyzed based on the pre-established short-circuit current calculation data model of the new energy station model, and determining the short-circuit current exceeding station of the power grid to be analyzed and the amount of the short-circuit current exceeding the standard; Blocking all new energy stations in the data model, and calculating the short-circuit current level of the station with the short-circuit current exceeding the standard after excluding the influence of the new energy stations; If the short-circuit current level exceeds the standard, each new energy station is blocked in turn, and the reduction in the short-circuit current calculated value of the station with the short-circuit current exceeding the standard after the blocking of each new energy station is calculated; Determining a sensitivity index of each new energy station based on a ratio of a reduction in the short-circuit current calculated value of each new energy station to an excess of the short-circuit current at the station where the short-circuit current exceeds the standard; Adjust the reactive power support coefficient of each new energy station according to the sensitivity index of each new energy station and the short-circuit current control sensitivity of the station where the short-circuit current exceeds the standard; Controlling the short-circuit current level of the short-circuit current exceeding the standard site of the power grid to be analyzed according to each new energy station that adjusts the reactive support coefficient; According to the sensitivity index of each new energy station and the short-circuit current control sensitivity of the station where the short-circuit current exceeds the standard, the reactive power support coefficient of each new energy station is adjusted, including: It is determined in sequence whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 30%. If the sensitivity index S of the new energy station j is greater than 30%, j If it is higher than 30%, adjust the reactive power support coefficient k of the new energy station j. T is 0.3; If S j Less than or equal to 30%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 15%. If the sensitivity index S of the new energy station j is less than or equal to 30%, determine whether the sensitivity index S of the new energy station j to the short-circuit current exceeding the standard station exceeds 15%. j If it is higher than 15%, the reactive power support coefficient k of the new energy station j is adjusted. T is 0.6; If S j Less than or equal to 15%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 5%, if the sensitivity S of station j is less than or equal to 15%, j If it is higher than 5%, adjust the reactive power support coefficient k of the new energy station j. T is 1.0; If S j If it is less than or equal to 5%, it is determined that there is no need to adjust the reactive support coefficient k of the new energy station j T .

2. The method according to claim 1, characterized in that Also includes: If the short-circuit current level does not exceed the standard, the short-circuit current level is suppressed by adjusting the new energy station control.

3. The method according to claim 1, characterized in that The short-circuit current level of the short-circuit current exceeding-standard station of the power grid to be analyzed is controlled according to each new energy station for adjusting the reactive support coefficient, including: Performing short-circuit current level control on the short-circuit current exceeding station of the power grid to be analyzed according to each new energy station for adjusting the reactive support coefficient, and calculating the short-circuit current calculated value of the short-circuit current exceeding station; Determine whether the calculated short-circuit current value exceeds the standard; if not, perform short-circuit current level control on the short-circuit current exceeding station of the power grid to be analyzed according to each new energy station that adjusts the reactive power support coefficient; If the calculated short-circuit current value exceeds the standard, the reactive current limit value of all new energy stations with a sensitivity index greater than or equal to 5% of the short-circuit current control sensitivity is adjusted to a preset value; The short-circuit current level of the short-circuit current exceeding the standard site of the power grid to be analyzed is controlled according to each new energy station adjusting the reactive current limit value.

4. A new energy grid short-circuit current control device based on sensitivity index, characterized in that: include: A first calculation module is used to calculate the short-circuit current of each node of the power grid to be analyzed based on the short-circuit current calculation data model of the power grid to be analyzed in a pre-established new energy station model, and determine the short-circuit current exceeding station of the power grid to be analyzed and the amount of the short-circuit current exceeding the standard; A second calculation module is configured to block all new energy stations in the data model and calculate the short-circuit current level of the station with the short-circuit current exceeding the standard after excluding the influence of the new energy stations; A third calculation module is configured to sequentially block each new energy station if the short-circuit current level exceeds the standard, and calculate a reduction in the short-circuit current calculated value of the station where the short-circuit current exceeds the standard after each new energy station is blocked; a determination module, configured to determine a sensitivity index of each new energy station based on a ratio of a reduction in the short-circuit current calculated value of each new energy station and an amount of the short-circuit current exceeding the standard at the station where the short-circuit current exceeds the standard; An adjustment module, configured to adjust the reactive support coefficient of each new energy station according to the sensitivity index of each new energy station and the short-circuit current control sensitivity of the station where the short-circuit current exceeds the standard; A control module, configured to control the short-circuit current level of the short-circuit current exceeding standard station of the power grid to be analyzed according to each new energy station for adjusting the reactive support coefficient; Adjustment modules, including: The first adjustment submodule is used to sequentially determine whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 30%. If the sensitivity index S of the new energy station j is greater than 30%, j If it is higher than 30%, adjust the reactive power support coefficient k of the new energy station j. T is 0.3; The second adjustment submodule is used for j Less than or equal to 30%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 15%. If the sensitivity index S of the new energy station j is less than or equal to 30%, determine whether the sensitivity index S of the new energy station j to the short-circuit current exceeding the standard station exceeds 15%. j If it is higher than 15%, the reactive power support coefficient k of the new energy station j is adjusted. T is 0.6; The third adjustment submodule is used for j Less than or equal to 15%, determine in turn whether the sensitivity index of each new energy station to the short-circuit current control sensitivity S of the short-circuit current exceeding the standard station exceeds 5%, if the sensitivity S of station j is less than or equal to 15%, j If it is higher than 5%, adjust the reactive power support coefficient k of the new energy station j. T is 1.0; The judgment submodule is used if S j If it is less than or equal to 5%, it is determined that there is no need to adjust the reactive support coefficient k of the new energy station j T .

5. The device according to claim 4, characterized in that Also includes: The suppression module is used to suppress the short-circuit current level by adjusting the new energy station control if the short-circuit current level does not exceed the standard.

6. The device according to claim 4, characterized in that Control module, including: a calculation submodule, configured to control the short-circuit current level of the short-circuit current exceeding station of the power grid to be analyzed according to each new energy station for adjusting the reactive support coefficient, and calculate the short-circuit current calculated value of the short-circuit current exceeding station; A first control submodule is configured to determine whether the calculated short-circuit current value exceeds the standard, and if not, to control the short-circuit current level of the short-circuit current exceeding station of the power grid to be analyzed according to each new energy station that adjusts the reactive power support coefficient; A fourth adjustment submodule is configured to adjust the reactive current limit values ​​of all new energy stations whose sensitivity index is greater than or equal to 5% of the short-circuit current control sensitivity to a preset value if the short-circuit current calculated value exceeds the standard; The second control submodule is used to control the short-circuit current level of the short-circuit current exceeding the standard site of the power grid to be analyzed according to each new energy site that adjusts the reactive current limit value.

7. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 3.

8. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 1 to 3.

Images