A method, system, device, and medium for adaptive protection testing

Abstract

A relay protection adaptability test method, system, device and medium are disclosed, including: in response to a test request, obtaining a power grid electromagnetic transient simulation model and a corresponding test model; based on the power grid electromagnetic transient simulation model, determining a target tight coupling area and a plurality of test points of the target tight coupling area; calculating the equivalent impedance of the system equivalent power source, rectifier load and new energy of the target tight coupling area to each test point, and determining the coupling degree of each test point according to all equivalent impedances; according to all coupling degrees, selecting target test points that respectively meet a plurality of coupling degree thresholds from all test points; and determining whether the relay protection adaptability of the target tight coupling area exists abnormity according to all target test points and a preset test condition through the test model. In the whole process of relay protection adaptability test, the accuracy of the test result of the relay protection adaptability test of the new power system is improved by constructing the coupling degree.

Description

Technical Field

[0001] This invention relates to the field of relay protection technology, and in particular to a relay protection adaptability testing method, system, equipment, and medium. Background Technology

[0002] Relay protection, based on the operating characteristics of power systems, aims to ensure the continuous operation of power systems by identifying fault characteristics. In the context of new power systems, the commissioning of large-scale rectifier loads and the large-scale application of new energy sources have significantly altered the operating characteristics and fault features of traditional power systems, posing new challenges and requirements for relay protection. For example, the frequency and peak value of fault currents during faults in new power systems may differ significantly from those in traditional power systems, and such differences can easily lead to maloperation or failure to operate of relay protection devices. Therefore, it is necessary to conduct adaptability testing of relay protection for new power systems.

[0003] Existing relay protection adaptability testing methods mostly employ incremental testing or simple local power grid models. Their fault characteristic simulations closely match actual faults in traditional power systems. However, due to the differences in operating characteristics and fault features between traditional and new power systems, it is impossible to determine whether there are anomalies in the relay protection adaptability of the tightly coupled areas of rectifier loads and new energy sources in new power systems, thus affecting the accuracy of the test results for relay protection adaptability testing of new power systems. Summary of the Invention

[0004] This invention provides a relay protection adaptability testing method, system, equipment, and medium, which solves the technical problem in the prior art that when conducting relay protection adaptability testing, it is impossible to determine whether there are abnormalities in the relay protection adaptability of the tightly coupled area between the rectifier load and new energy in the new power system, thus affecting the accuracy of the test results of the relay protection adaptability test of the new power system.

[0005] The first aspect of this invention provides a relay protection adaptability testing method, comprising:

[0006] Respond to the test request and obtain the power grid electromagnetic transient simulation model and the corresponding test model;

[0007] Based on the power grid electromagnetic transient simulation model, the target tightly coupled region and multiple test points of the target tightly coupled region are determined;

[0008] Calculate the equivalent impedance of the system's equivalent power supply, rectified load, and new energy source to each of the test points in the target tightly coupled region, and determine the coupling degree of each test point based on all the equivalent impedances;

[0009] Based on all the coupling degrees, target test points that satisfy multiple coupling degree thresholds are selected from all the test points;

[0010] The test model determines whether there are any abnormalities in the relay protection adaptability of the target tightly coupled region based on all the target test points and preset test conditions.

[0011] Optionally, the step of calculating the equivalent power supply, rectified load, and equivalent impedance of the new energy source to each of the test points in the target tightly coupled region, and determining the coupling degree of each test point based on all the equivalent impedances, includes:

[0012] Calculate the system equivalent power supply to each of the test points in the target tightly coupled region;

[0013] Calculate the total equivalent impedance from the system's equivalent power source, rectified load, and new energy source to each of the test points in the target tightly coupled region.

[0014] The coupling degree corresponding to each of the first equivalent impedances is calculated by comparing each of the first equivalent impedances with the corresponding total equivalent impedance.

[0015] Optionally, the step of calculating the system equivalent power supply to each of the test points in the target tightly coupled region includes:

[0016] Based on the aforementioned power grid electromagnetic transient simulation model, the equivalent power source of the system in the target tightly coupled region is determined;

[0017] Calculate the equivalent system impedance from each of the system's equivalent power sources to each of the test points;

[0018] Using the equivalent impedance of the entire system, the first equivalent impedance of each test point is determined according to the preset first equivalent impedance calculation formula;

[0019] The specific formula for calculating the first equivalent impedance is as follows:

[0020]

[0021] Among them, Z S Z is the first equivalent impedance. Si Let I be the equivalent impedance of the system from the i-th system equivalent power source to the test point, and let I be the number of system equivalent power sources in the target tightly coupled region.

[0022] Optionally, the step of calculating the total equivalent impedance of the system's equivalent power source, rectified load, and new energy source to each of the test points in the target tightly coupled region includes:

[0023] According to the preset second equivalent impedance calculation formula, calculate the second equivalent impedance from the rectified load of the target tightly coupled region to each of the test points;

[0024] According to the preset third equivalent impedance calculation formula, calculate the third equivalent impedance from the new energy source in the target tightly coupled region to each of the test points;

[0025] Using all the first equivalent impedance, all the second equivalent impedance, and all the third equivalent impedance, the total equivalent impedance of each test point is calculated according to the preset total equivalent impedance calculation formula.

[0026] The specific formula for calculating the second equivalent impedance is as follows:

[0027]

[0028] The specific formula for calculating the third equivalent impedance is as follows:

[0029]

[0030] The specific formula for calculating the total equivalent impedance is as follows:

[0031]

[0032] Among them, Z L Z is the second equivalent impedance. G For the third equivalent impedance, Z T Z is the total equivalent impedance. Ln Z is the equivalent impedance of the rectified load from the nth rectified load to the test point. Gm Let N be the equivalent impedance of the m-th new energy source to the test point, N be the number of rectifier loads in the target tightly coupled region, and M be the number of new energy sources in the target tightly coupled region.

[0033] Optionally, the step of selecting target test points that satisfy multiple coupling degree thresholds from all the test points based on all the coupling degrees includes:

[0034] Iterate through all the aforementioned coupling degrees and determine whether there exists a first target coupling degree equal to any coupling degree threshold;

[0035] If it exists, then select the test point corresponding to the first target coupling degree from all the test points as the target test point;

[0036] If it does not exist, the coupling degree with the smallest difference from any of the coupling degree thresholds is selected as the second target coupling degree, and the second target coupling degree is adjusted to be equal to any of the coupling degree thresholds by updating the electromagnetic transient simulation model of the power grid;

[0037] Jump to execute the step of traversing all the coupling degrees and determining whether there is a first target coupling degree equal to any coupling degree threshold, until the number of the target test points meets the preset number threshold.

[0038] Optionally, the step of selecting the coupling degree with the smallest difference from any of the coupling degree thresholds as the second target coupling degree if it does not exist, and adjusting the second target coupling degree to be equal to any of the coupling degree thresholds by updating the power grid electromagnetic transient simulation model, includes:

[0039] If not, calculate the difference between all the stated coupling degrees and any of the stated coupling degree thresholds;

[0040] From all the stated coupling degrees, the coupling degree with the smallest difference from any of the stated coupling degree thresholds is selected as the second target coupling degree;

[0041] The power equipment associated with the second target coupling degree is determined based on the power grid electromagnetic transient simulation model;

[0042] The electromagnetic transient simulation model of the power grid is updated by adjusting the model parameters of the power equipment, and the second target coupling degree is adjusted to be equal to any of the coupling degree thresholds.

[0043] Optionally, the step of determining whether there is an anomaly in the relay protection adaptability of the target tightly coupled region based on all the target test points and preset test conditions using the test model includes:

[0044] The test model is used to test each of the target test points and generate test results.

[0045] Determine whether the test results meet the preset test conditions;

[0046] If so, then it is determined that there is no abnormality in the relay protection adaptability of the target tightly coupled region;

[0047] If not, then it is determined that the relay protection adaptability of the target tightly coupled region is abnormal.

[0048] A second aspect of the present invention provides a relay protection adaptability testing system, comprising:

[0049] The model acquisition module is used to respond to test requests and acquire the electromagnetic transient simulation model of the power grid and the corresponding test model;

[0050] The test point determination module is used to determine the target tightly coupled region and multiple test points of the target tightly coupled region based on the electromagnetic transient simulation model of the power grid;

[0051] The coupling degree calculation module is used to calculate the equivalent power supply, rectified load and new energy source of the system to each of the test points in the target tightly coupled region, and to determine the coupling degree of each of the test points based on all the equivalent impedances.

[0052] The target test point determination module is used to select target test points that satisfy multiple coupling degree thresholds from all the test points based on all the coupling degrees.

[0053] The test execution module is used to determine whether there is an abnormality in the relay protection adaptability of the target tightly coupled region based on all the target test points and preset test conditions through the test model.

[0054] A third aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the relay protection adaptability test method as described in any one of the first aspects of the present invention.

[0055] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed, it implements the relay protection adaptability test method as described in any one of the first aspects of the present invention.

[0056] As can be seen from the above technical solutions, the present invention has the following advantages:

[0057] This invention, in response to test requests, acquires the corresponding power grid electromagnetic transient simulation model and test model. Based on the power grid electromagnetic transient simulation model, it determines the target tightly coupled region and multiple test points within the target tightly coupled region. By calculating the equivalent power source, rectifier load, and equivalent impedance from the renewable energy source to each test point in the target tightly coupled region, it determines the coupling degree of each test point. Based on the total coupling degree and multiple coupling degree thresholds, it determines multiple corresponding target test points. Using the test model, based on the target test points and preset test conditions, it determines whether there are any anomalies in the relay protection adaptability of the target tightly coupled region. Throughout the relay protection adaptability testing process, by constructing a more comprehensive and realistic test of coupling degree in the tightly coupled region between renewable energy sources and rectifier loads, the accuracy of the test results for relay protection adaptability testing of new power systems is improved. Attached Figure Description

[0058] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 This is a flowchart of the steps of a relay protection adaptability testing method provided in Embodiment 1 of the present invention;

[0060] Figure 2 This is a flowchart of the steps of a relay protection adaptability testing method provided in Embodiment 2 of the present invention;

[0061] Figure 3 This is a structural block diagram of a relay protection adaptability testing system provided in Embodiment 3 of the present invention. Detailed Implementation

[0062] This invention provides a relay protection adaptability testing method, system, equipment, and medium to address the technical problem in the prior art where it is impossible to determine whether there are abnormalities in the relay protection adaptability of the tightly coupled area between the rectifier load and new energy in a new power system, thus affecting the accuracy of the test results for the relay protection adaptability test of the new power system.

[0063] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0064] Please see Figure 1 , Figure 1 The flowchart illustrates the steps of a relay protection adaptability testing method provided in Embodiment 1 of the present invention.

[0065] This invention provides a relay protection adaptability testing method, comprising:

[0066] Step 101: Respond to the test request and obtain the power grid electromagnetic transient simulation model and the corresponding test model.

[0067] A test request refers to a request message sent by a demand-side platform that can support adaptive testing applications for relay protection.

[0068] The electromagnetic transient simulation model of a power grid refers to a simulation model built in real-time electromagnetic transient visualization simulation software based on the actual operating scale of the power grid.

[0069] A test model refers to a model established based on a power grid electromagnetic transient simulation model, according to defined relay protection adaptability tests, and used for simulation testing. Relay protection adaptability tests include, but are not limited to, single-phase permanent short-circuit fault tests, two-phase-to-ground fault tests, three-phase-to-ground fault tests, and two-phase-to-phase fault tests. Optionally, a test model may include multiple sub-test models, each corresponding to a different type of relay protection adaptability test.

[0070] In this embodiment of the invention, when a test request is received from any demand-side platform that supports relay protection adaptability testing, the test request can be parsed to obtain the electromagnetic transient simulation model of the actual power grid corresponding to the power grid that needs to be tested for relay protection adaptability, as well as the test model established based on the electromagnetic transient simulation model of the power grid.

[0071] Step 102: Based on the electromagnetic transient simulation model of the power grid, determine the target tightly coupled region and multiple test points in the target tightly coupled region.

[0072] The target tightly coupled region refers to the coupling region where the rectifier load and the new energy source are tightly coupled and require relay protection adaptability testing.

[0073] Test points refer to the locations where relay protection adaptability tests are pre-set.

[0074] In this embodiment of the invention, the power grid electromagnetic transient simulation model is based on the power grid structure of the actual power grid corresponding to the test request. It simulates and displays the distribution of rectifier loads, new energy sources and equivalent power sources in the actual power grid. Through the power grid electromagnetic transient simulation model, the coupling region of the rectifier load and new energy source is initially determined. From all coupling regions, the coupling region that needs to be tested for relay protection adaptability is determined as the target tightly coupled region. Based on the power grid electromagnetic transient simulation model, the test points for relay protection adaptability testing in the target tightly coupled region are extracted.

[0075] Step 103: Calculate the equivalent impedance of the system's equivalent power supply, rectified load, and new energy source to each test point in the target tightly coupled region, and determine the coupling degree of each test point based on all equivalent impedances.

[0076] Coupling degree refers to a parameter that measures the system strength in the region of tight coupling between rectified loads and new energy sources. It can be understood that rectified loads are typically loads that require AC power to be converted to DC power by power electronic devices before being connected to the grid, including loads in metal smelting industries such as electrolytic aluminum, and loads in rail transportation. New energy sources typically refer to energy generated by photovoltaic and wind power.

[0077] In this embodiment of the invention, the equivalent power source, rectifier load and new energy source of the system in the target tightly coupled region are determined based on the electromagnetic transient simulation model of the power grid. The coupling degree of each test point is determined by converting the equivalent power source, rectifier load and new energy source of the system into the form of equivalent impedance.

[0078] Step 104: Based on the total coupling degree, select target test points from all test points that satisfy multiple coupling degree thresholds respectively.

[0079] The coupling degree threshold refers to the threshold used to determine the test points for relay protection adaptability testing based on the coupling degree.

[0080] The target test point refers to the actual location where relay protection adaptability testing is conducted.

[0081] In this embodiment of the invention, after determining the coupling degree of all test points, a target coupling degree that meets the coupling degree threshold is determined from all coupling degrees, and a corresponding test point is selected from all test points as the target test point based on the target coupling degree.

[0082] Step 105: Using the test model, determine whether there are any abnormalities in the relay protection adaptability of the target tightly coupled region based on the target test points and preset test conditions.

[0083] Test conditions refer to the ability of the target test point to respond correctly during relay protection adaptability testing.

[0084] In this embodiment of the invention, in the electromagnetic transient simulation model of the power grid, relay protection logic with different protection principles is built with reference to the actual relay protection device strategy, or the actual relay protection device is simulated and connected. Then, through the test model, the target test point can be led out and connected to the fault branch of the switch in series in the electromagnetic transient simulation model of the power grid. When the switch is closed during the test, the fault takes effect. By checking whether the relay protection device or the relay protection device strategy can operate correctly, it can be determined whether there is an abnormality in the relay protection adaptability of the target tightly coupled area.

[0085] It is understandable that relay protection logic based on different protection principles includes, but is not limited to, current protection, differential protection, and distance protection.

[0086] In this embodiment of the invention, by responding to a test request, a corresponding power grid electromagnetic transient simulation model and test model are obtained. Based on the power grid electromagnetic transient simulation model, a target tightly coupled region and multiple test points within the target tightly coupled region are determined. The coupling degree of each test point is determined by calculating the equivalent power source, rectifier load, and equivalent impedance of the new energy source to each test point within the target tightly coupled region. Based on the total coupling degree and multiple coupling degree thresholds, multiple corresponding target test points are determined. Using the test model, based on the target test points and preset test conditions, it is determined whether there are any anomalies in the relay protection adaptability of the target tightly coupled region. Throughout the relay protection adaptability test process, by constructing a more comprehensive and realistic test of coupling degree in the tightly coupled region between new energy sources and rectifier loads, the accuracy of the test results for the relay protection adaptability test of the new power system is improved.

[0087] Please see Figure 2 , Figure 2 This is a flowchart of the steps of a relay protection adaptability test method provided in Embodiment 2 of the present invention.

[0088] This invention provides a relay protection adaptability testing method, comprising:

[0089] Step 201: Respond to the test request and obtain the power grid electromagnetic transient simulation model and the corresponding test model.

[0090] In this embodiment of the invention, the specific implementation process of step 201 is similar to that of step 101, and will not be repeated here.

[0091] Step 202: Based on the electromagnetic transient simulation model of the power grid, determine the target tightly coupled region and multiple test points in the target tightly coupled region.

[0092] In this embodiment of the invention, the specific implementation process of step 202 is similar to that of step 102, and will not be repeated here.

[0093] Step 203: Calculate the equivalent power supply of the system to each test point in the target tightly coupled region.

[0094] Optionally, step 203 includes the following sub-steps:

[0095] Based on the electromagnetic transient simulation model of the power grid, the equivalent power source of the system in the target tightly coupled region is determined;

[0096] Calculate the equivalent impedance of each system's equivalent power source to each test point;

[0097] The first equivalent impedance of each test point is determined by using the equivalent impedance of the entire system and according to the preset first equivalent impedance calculation formula.

[0098] The specific formula for calculating the first equivalent impedance is as follows:

[0099]

[0100] Among them, Z S Z is the first equivalent impedance. Si Let I be the equivalent impedance of the system from the i-th system equivalent power source to the test point, and let I be the number of system equivalent power sources in the target tightly coupled region.

[0101] The first equivalent impedance refers to the equivalent impedance of the entire system equivalent power supply in the target coupling region to a test point.

[0102] In this embodiment of the invention, the distribution of the system equivalent power source in the target tightly coupled region can be determined based on the electromagnetic transient simulation model of the power grid. The system equivalent impedance from each system equivalent power source to each test point is calculated. The first equivalent impedance of each test point is determined by calculating all the system equivalent impedances corresponding to each test point according to the first equivalent impedance calculation formula.

[0103] Step 204: Calculate the equivalent power supply, rectified load, and new energy source of the target tightly coupled region, and the total equivalent impedance to each test point.

[0104] Optionally, step 204 includes the following sub-steps:

[0105] According to the preset second equivalent impedance calculation formula, calculate the second equivalent impedance from the rectified load of the target tightly coupled region to each test point;

[0106] According to the preset formula for calculating the third equivalent impedance, calculate the third equivalent impedance from the new energy source in the target tightly coupled region to each test point;

[0107] Using all first equivalent impedances, all second equivalent impedances, and all third equivalent impedances, the total equivalent impedance of each test point is calculated according to the preset total equivalent impedance calculation formula.

[0108] The specific formula for calculating the second equivalent impedance is as follows:

[0109]

[0110] The specific formula for calculating the third equivalent impedance is as follows:

[0111]

[0112] The specific formula for calculating the total equivalent impedance is as follows:

[0113]

[0114] Among them, Z L Z is the second equivalent impedance. G For the third equivalent impedance, ZT Z is the total equivalent impedance. Ln Z is the equivalent impedance of the rectified load from the nth rectified load to the test point. Gm Let N be the equivalent impedance of the m-th new energy source to the test point, N be the number of rectifier loads in the target tightly coupled region, and M be the number of new energy sources in the target tightly coupled region.

[0115] The second equivalent impedance refers to the equivalent impedance of the entire rectified load of the target coupling region to a test point.

[0116] The third equivalent impedance refers to the equivalent impedance of all new energy sources in the target coupling region to a single test point.

[0117] Total equivalent impedance refers to the equivalent impedance of all system equivalent power sources, all rectified loads, and all new energy sources in the target coupling region to a single test point.

[0118] In this embodiment of the invention, the distribution of rectified loads and renewable energy sources in the target tightly coupled region can also be determined based on the power grid electromagnetic transient simulation model. The equivalent impedance of each rectified load to each test point is calculated. Based on the equivalent impedance of all rectified loads corresponding to each test point, the second equivalent impedance of all rectified loads in the target tightly coupled region to each test point is determined according to the calculation formula for the second equivalent impedance. The equivalent impedance of each renewable energy source to each test point is calculated. The equivalent impedance of all renewable energy sources corresponding to each test point is calculated according to the calculation formula for the third equivalent impedance to determine the third equivalent impedance of all renewable energy sources in the target tightly coupled region to each test point. Using the first, second, and third equivalent impedances corresponding to each test point, the total equivalent impedance corresponding to each test point is calculated according to the calculation formula for the total equivalent impedance.

[0119] It is understandable that the calculation process for the equivalent impedance of each system, the equivalent impedance of the rectifier load, or the equivalent impedance of the new energy source can be found in the specific content of the calculation of equivalent impedance in the existing technology, and will not be repeated here.

[0120] Step 205: Calculate the ratio of each first equivalent impedance to the corresponding total equivalent impedance to generate the coupling degree corresponding to each test point.

[0121] Optionally, the formula for calculating the coupling degree C is as follows:

[0122]

[0123] In this embodiment of the invention, the coupling degree corresponding to each test point is generated by calculating the ratio between the first equivalent impedance of each test point and the associated total equivalent impedance. The coupling degree is a parameter greater than 1. If the coupling degree is larger, it indicates that the equivalent impedance from the system's equivalent power source to the test point has a smaller impact on the total equivalent impedance of the test point, which means that the rectifier load and the density of new energy sources in the target coupling area are relatively high. If the coupling degree is both larger and smaller, it indicates that the equivalent impedance from the system's equivalent power source to the test point has a greater impact on the total equivalent impedance of the system at the test point, which means that the rectifier load and the density of new energy sources in the target coupling area are relatively low.

[0124] Step 206: Based on the total coupling degree, select target test points from all test points that satisfy multiple coupling degree thresholds respectively.

[0125] Optionally, step 206 includes sub-steps S1-S4:

[0126] S1. Traverse all coupling degrees and determine whether there exists a first target coupling degree equal to any coupling degree threshold;

[0127] S2. If it exists, select the test point corresponding to the first target coupling degree from all test points as the target test point;

[0128] S3. If it does not exist, select the coupling degree with the smallest difference from any coupling degree threshold as the second target coupling degree, and adjust the second target coupling degree to be equal to any coupling degree threshold by updating the power grid electromagnetic transient simulation model.

[0129] S4. Jump to execute the step of traversing all coupling degrees and determining whether there is a first target coupling degree equal to any coupling degree threshold, until the number of target test points meets the preset number threshold.

[0130] Optionally, sub-step S3 includes:

[0131] If it does not exist, calculate the difference between the total coupling degree and any coupling degree threshold;

[0132] From all coupling degrees, select the coupling degree that has the smallest difference from any coupling degree threshold as the second target coupling degree;

[0133] The power equipment associated with the second target coupling degree is determined based on the power grid electromagnetic transient simulation model;

[0134] By adjusting the model parameters of the power equipment to update the electromagnetic transient simulation model of the power grid, the second target coupling degree is adjusted to be equal to any coupling degree threshold.

[0135] The first target coupling degree refers to the coupling degree that is equal to the coupling degree threshold.

[0136] The second target coupling degree refers to the coupling degree that is closest to the coupling degree threshold.

[0137] The quantity threshold refers to the number of coupling thresholds.

[0138] In this embodiment of the invention, all coupling degrees are traversed to determine whether there is a coupling degree equal to any coupling degree threshold. If there is, it is taken as the first target coupling degree, and all test points corresponding to the first target coupling degree are selected from all test points as target test points. If any coupling degree threshold among all test points does not match an equal coupling degree, the difference between all coupling degrees and that particular coupling degree threshold is calculated. The minimum difference is determined by comparing all differences, and the coupling degree with the minimum difference is taken as the second target coupling degree. The test point corresponding to the second target coupling degree is determined based on the power grid electromagnetic transient simulation model. According to the position of the test point corresponding to the second target coupling degree in the power grid structure of the power grid electromagnetic transient simulation model, the power equipment associated with the test point corresponding to the second target coupling degree in the power grid electromagnetic transient simulation model is determined. The model parameters of the associated power equipment in the power grid electromagnetic transient simulation model are adjusted to update the power grid electromagnetic transient simulation model until the second target coupling degree is adjusted to be equal to that particular coupling degree threshold. At this point, the adjustment of model parameters is stopped, and the process jumps to the step of traversing all coupling degrees and determining whether there is a first target coupling degree equal to any coupling degree threshold, until the number of selected target test points meets the preset number threshold.

[0139] It is understandable that the test points exist within the power grid structure of the power grid electromagnetic transient simulation model, and the power equipment associated with the test points refers to the power equipment that has an electrical connection with the test points within the power grid structure, including but not limited to lines and main transformers. Therefore, adjusting the model parameters of the power equipment can be done by modifying the line length and main transformer parameters within the power grid electromagnetic transient simulation model.

[0140] Optionally, multiple coupling thresholds can be set to three coupling thresholds, including a first coupling threshold, a second coupling threshold, and a third coupling threshold. Each coupling threshold has a certain difference, which is sufficient to represent the coupling degree of the actual power grid. For example, the first coupling threshold can be set to 5, the second coupling threshold to 15, and the third coupling threshold to 30.

[0141] Step 207: Using the test model, determine whether there are any abnormalities in the relay protection adaptability of the target tightly coupled area based on all target test points and preset test conditions.

[0142] Optionally, step 207 includes the following sub-steps:

[0143] The test model is used to test each target test point separately, and test results are generated.

[0144] Determine whether the test results meet the preset test conditions;

[0145] If so, then it is determined that there is no abnormality in the relay protection adaptability of the target tightly coupled region;

[0146] If not, then it is determined that there is an anomaly in the relay protection adaptability of the target tightly coupled region.

[0147] The test result refers to the result composed of the sub-test results of each target test point.

[0148] In this embodiment of the invention, after determining all target test points, a relay protection adaptability test is performed at each target test point using a test model, generating test results for all target test points. The test results are analyzed. If it is determined that each target test point can correctly respond to the simulation test of the test model, then the relay protection adaptability of the target tightly coupled region is determined to be normal, meaning the relay protection device or relay protection device strategy in the target tightly coupled region is feasible. Conversely, if any target test point cannot correctly respond to the simulation test of the test model, then the relay protection adaptability of the target tightly coupled region is determined to be abnormal, meaning the relay protection device or relay protection device strategy in the target tightly coupled region still needs improvement.

[0149] In this embodiment of the invention, by responding to a test request, the corresponding power grid electromagnetic transient simulation model and test model are obtained. Based on the power grid electromagnetic transient simulation model, a target tightly coupled region and multiple test points within the target tightly coupled region are determined. The total equivalent impedance of each test point is determined by calculating the first equivalent impedance, second equivalent impedance, and third equivalent impedance from the system equivalent power source, rectifier load, and new energy source to each test point within the target tightly coupled region. The coupling degree of each test point is then determined by calculating the ratio of the first equivalent impedance to the total equivalent impedance. Multiple corresponding target test points are determined based on the total coupling degree and multiple coupling degree thresholds. The test model, based on the target test points and preset test conditions, determines whether there are any anomalies in the relay protection adaptability of the target tightly coupled region. Throughout the relay protection adaptability test process, by constructing a more comprehensive and realistic test of the coupling degree in the tightly coupled region between new energy sources and rectifier loads, the accuracy of the test results for the relay protection adaptability test of the new power system is improved.

[0150] Please see Figure 3 , Figure 3 This is a structural block diagram of a relay protection adaptability testing system provided in Embodiment 3 of the present invention.

[0151] This invention provides a relay protection adaptability testing system, comprising:

[0152] The model acquisition module 301 is used to respond to test requests and acquire the electromagnetic transient simulation model of the power grid and the corresponding test model.

[0153] The test point determination module 302 is used to determine the target tightly coupled region and multiple test points in the target tightly coupled region based on the power grid electromagnetic transient simulation model.

[0154] The coupling degree calculation module 303 is used to calculate the equivalent power supply, rectified load and new energy source to each test point in the target tightly coupled region, and to determine the coupling degree of each test point based on the total equivalent impedance.

[0155] The target test point determination module 304 is used to select target test points that satisfy multiple coupling degree thresholds from all test points based on the total coupling degree.

[0156] Test execution module 305 is used to determine whether there is any abnormality in the relay protection adaptability of the target tightly coupled region based on all target test points and preset test conditions through the test model.

[0157] Optionally, the coupling calculation module 303 includes:

[0158] The first equivalent impedance calculation unit is used to calculate the equivalent power supply of the system to each test point in the target tightly coupled region.

[0159] The total equivalent impedance calculation unit is used to calculate the total equivalent impedance of the system's equivalent power source, rectified load, and new energy source to each test point in the target tightly coupled region.

[0160] The coupling degree calculation unit is used to calculate the ratio of each first equivalent impedance to the corresponding total equivalent impedance to generate the coupling degree corresponding to each test point.

[0161] Optionally, the first equivalent impedance calculation unit is specifically used for:

[0162] Based on the electromagnetic transient simulation model of the power grid, the equivalent power source of the system in the target tightly coupled region is determined;

[0163] Calculate the equivalent impedance of each system's equivalent power source to each test point;

[0164] The first equivalent impedance of each test point is determined by using the equivalent impedance of the entire system and according to the preset first equivalent impedance calculation formula.

[0165] The specific formula for calculating the first equivalent impedance is as follows:

[0166]

[0167] Among them, Z S Z is the first equivalent impedance.Si Let I be the equivalent impedance of the system from the i-th system equivalent power source to the test point, and let I be the number of system equivalent power sources in the target tightly coupled region.

[0168] Optionally, the total equivalent impedance calculation unit is specifically used for:

[0169] According to the preset second equivalent impedance calculation formula, calculate the second equivalent impedance from the rectified load of the target tightly coupled region to each test point;

[0170] According to the preset formula for calculating the third equivalent impedance, calculate the third equivalent impedance from the new energy source in the target tightly coupled region to each test point;

[0171] Using all first equivalent impedances, all second equivalent impedances, and all third equivalent impedances, the total equivalent impedance of each test point is calculated according to the preset total equivalent impedance calculation formula.

[0172] The specific formula for calculating the second equivalent impedance is as follows:

[0173]

[0174] The specific formula for calculating the third equivalent impedance is as follows:

[0175]

[0176] The specific formula for calculating the total equivalent impedance is as follows:

[0177]

[0178] Among them, Z L Z is the second equivalent impedance. G For the third equivalent impedance, Z T Z is the total equivalent impedance. Ln Z is the equivalent impedance of the rectified load from the nth rectified load to the test point. Gm Let N be the equivalent impedance of the m-th new energy source to the test point, N be the number of rectifier loads in the target tightly coupled region, and M be the number of new energy sources in the target tightly coupled region.

[0179] Optionally, the target test point determination module 304 is specifically used for:

[0180] Iterate through all coupling degrees and determine whether there exists a first target coupling degree equal to any coupling degree threshold.

[0181] If it exists, then select the test point corresponding to the first target coupling degree from all test points as the target test point;

[0182] If it does not exist, the coupling degree with the smallest difference from any coupling degree threshold is selected as the second target coupling degree, and the second target coupling degree is adjusted to be equal to any coupling degree threshold by updating the electromagnetic transient simulation model of the power grid.

[0183] Jump to execute the step of traversing all coupling degrees and determining whether there is a first target coupling degree equal to any coupling degree threshold, until the number of target test points meets the preset number threshold.

[0184] Optionally, the target test point determination module 304 is also specifically used for:

[0185] If it does not exist, calculate the difference between the total coupling degree and any coupling degree threshold;

[0186] From all coupling degrees, select the coupling degree that has the smallest difference from any coupling degree threshold as the second target coupling degree;

[0187] The power equipment associated with the second target coupling degree is determined based on the power grid electromagnetic transient simulation model;

[0188] By adjusting the model parameters of the power equipment to update the electromagnetic transient simulation model of the power grid, the second target coupling degree is adjusted to be equal to any coupling degree threshold.

[0189] Optionally, the test execution module 305 is specifically used for:

[0190] The test model is used to test each target test point separately, and test results are generated.

[0191] Determine whether the test results meet the preset test conditions;

[0192] If so, then it is determined that there is no abnormality in the relay protection adaptability of the target tightly coupled region;

[0193] If not, then it is determined that there is an anomaly in the relay protection adaptability of the target tightly coupled region.

[0194] This invention also provides an electronic device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the relay protection adaptability test method as described in any embodiment of this invention.

[0195] This invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the relay protection adaptability testing method as described in any embodiment of this invention.

[0196] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the system and modules described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0197] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0198] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0199] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0200] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0201] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing the adaptability of relay protection, characterized in that, include: Respond to the test request and obtain the power grid electromagnetic transient simulation model and the corresponding test model; Based on the power grid electromagnetic transient simulation model, the target tightly coupled region and multiple test points of the target tightly coupled region are determined; Calculate the equivalent impedance of the system's equivalent power supply, rectified load, and new energy source to each of the test points in the target tightly coupled region, and determine the coupling degree of each test point based on all the equivalent impedances; Based on all the coupling degrees, target test points that satisfy multiple coupling degree thresholds are selected from all the test points; The test model is used to determine whether there are any abnormalities in the relay protection adaptability of the target tightly coupled region based on all the target test points and preset test conditions. The step of calculating the equivalent power supply, rectified load, and equivalent impedance of the new energy source to each test point in the target tightly coupled region, and determining the coupling degree of each test point based on all the equivalent impedances, includes: Calculate the system equivalent power supply to each of the test points in the target tightly coupled region; Calculate the total equivalent impedance from the system's equivalent power source, rectified load, and new energy source to each of the test points in the target tightly coupled region. The coupling degree corresponding to each of the first equivalent impedances is calculated by comparing each of the first equivalent impedances with the corresponding total equivalent impedance.

2. The relay protection adaptability testing method according to claim 1, characterized in that, The step of calculating the system equivalent power supply to each of the test points in the target tightly coupled region includes: Based on the aforementioned power grid electromagnetic transient simulation model, the equivalent power source of the system in the target tightly coupled region is determined; Calculate the equivalent system impedance from each of the system's equivalent power sources to each of the test points; Using the equivalent impedance of the entire system, the first equivalent impedance of each test point is determined according to the preset first equivalent impedance calculation formula; The specific formula for calculating the first equivalent impedance is as follows: ； in, The first equivalent impedance, Let I be the equivalent impedance of the system from the i-th system equivalent power source to the test point, and let I be the number of system equivalent power sources in the target tightly coupled region.

3. The relay protection adaptability testing method according to claim 1, characterized in that, The step of calculating the total equivalent impedance from the system's equivalent power source, rectified load, and new energy source to each of the test points in the target tightly coupled region includes: According to the preset second equivalent impedance calculation formula, calculate the second equivalent impedance from the rectified load of the target tightly coupled region to each of the test points; According to the preset third equivalent impedance calculation formula, calculate the third equivalent impedance from the new energy source in the target tightly coupled region to each of the test points; Using all the first equivalent impedance, all the second equivalent impedance, and all the third equivalent impedance, the total equivalent impedance of each test point is calculated according to the preset total equivalent impedance calculation formula. The specific formula for calculating the second equivalent impedance is as follows: ； The specific formula for calculating the third equivalent impedance is as follows: ； The specific formula for calculating the total equivalent impedance is as follows: ； in, The second equivalent impedance, The third equivalent impedance, The total equivalent impedance, Let be the equivalent impedance of the rectified load from the nth rectified load to the test point. Let be the equivalent impedance of the m-th new energy source to the test point. The first equivalent impedance is N, where N is the number of rectifier loads in the target tightly coupled region, and M is the number of new energy sources in the target tightly coupled region.

4. The relay protection adaptability testing method according to claim 1, characterized in that, The step of selecting target test points that satisfy multiple coupling degree thresholds from all the test points based on all the coupling degrees includes: Iterate through all the aforementioned coupling degrees and determine whether there exists a first target coupling degree equal to any coupling degree threshold; If it exists, then select the test point corresponding to the first target coupling degree from all the test points as the target test point; If it does not exist, the coupling degree with the smallest difference from any of the coupling degree thresholds is selected as the second target coupling degree, and the second target coupling degree is adjusted to be equal to any of the coupling degree thresholds by updating the electromagnetic transient simulation model of the power grid; Jump to execute the step of traversing all the coupling degrees and determining whether there is a first target coupling degree equal to any coupling degree threshold, until the number of the target test points meets the preset number threshold.

5. The relay protection adaptability testing method according to claim 4, characterized in that, If the first target coupling degree does not exist, the second target coupling degree is selected as the coupling degree with the smallest difference from any of the coupling degree thresholds. The step of adjusting the second target coupling degree to be equal to any of the coupling degree thresholds by updating the power grid electromagnetic transient simulation model includes: If not, calculate the difference between all the stated coupling degrees and any of the stated coupling degree thresholds; From all the stated coupling degrees, the coupling degree with the smallest difference from any of the stated coupling degree thresholds is selected as the second target coupling degree; The power equipment associated with the second target coupling degree is determined based on the power grid electromagnetic transient simulation model; The electromagnetic transient simulation model of the power grid is updated by adjusting the model parameters of the power equipment, and the second target coupling degree is adjusted to be equal to any of the coupling degree thresholds.

6. The relay protection adaptability testing method according to claim 1, characterized in that, The step of determining whether there is an anomaly in the relay protection adaptability of the target tightly coupled region based on all the target test points and preset test conditions using the test model includes: The test model is used to test each of the target test points and generate test results. Determine whether the test results meet the preset test conditions; If so, then it is determined that there is no abnormality in the relay protection adaptability of the target tightly coupled region; If not, then it is determined that the relay protection adaptability of the target tightly coupled region is abnormal.

7. A relay protection adaptability testing system, characterized in that, include: The model acquisition module is used to respond to test requests and acquire the electromagnetic transient simulation model of the power grid and the corresponding test model; The test point determination module is used to determine the target tightly coupled region and multiple test points of the target tightly coupled region based on the electromagnetic transient simulation model of the power grid; The coupling degree calculation module is used to calculate the equivalent power supply, rectified load and new energy source of the system to each of the test points in the target tightly coupled region, and to determine the coupling degree of each of the test points based on all the equivalent impedances. The target test point determination module is used to select target test points that satisfy multiple coupling degree thresholds from all the test points based on all the coupling degrees. The test execution module is used to determine whether there is an abnormality in the relay protection adaptability of the target tightly coupled region based on all the target test points and preset test conditions through the test model; The coupling degree calculation module includes: The first equivalent impedance calculation unit is used to calculate the system equivalent power supply of the target tightly coupled region to the first equivalent impedance of each of the test points; The total equivalent impedance calculation unit is used to calculate the total equivalent impedance of the system's equivalent power supply, rectified load, and new energy source in the target tightly coupled region to each of the test points; The coupling degree calculation unit is used to perform a ratio calculation between each of the first equivalent impedances and the corresponding total equivalent impedance to generate the coupling degree corresponding to each of the test points.

8. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform the steps of the relay protection adaptability test method as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the relay protection adaptability test method as described in any one of claims 1-6.

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