Methods, apparatus, devices, and computer storage media based on mutation amounts for initiation.

Abstract

This application discloses a startup method, apparatus, device, and computer storage medium based on abrupt change, relating to the field of power system relay protection technology. The method includes: acquiring sampling data of the first phase signal at a first sampling point and a second sampling point, and sampling data of the second phase signal at a third sampling point and a fourth sampling point, from the three-phase signals at the transmission line protection installation location; calculating abrupt change criterion for the first and second phase signals at the corresponding first sampling point based on the sampling data of the first phase signal at the first and second sampling points, and the sampling data of the second phase signal at the third and fourth sampling points; and activating the startup element of the transmission line based on the abrupt change criterion to calculate the fault occurring on the transmission line. According to the embodiments of this application, the influence of the fault initial phase angle and power system oscillations can be avoided, effectively ensuring the sensitivity and reliability of transmission line startup.

Description

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 202210716536.8, filed on June 22, 2022, entitled “An Improved Mutation Amount Initiating Element”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of power system relay protection technology, and particularly relates to a starting method, device, equipment and computer storage medium based on sudden change. Background Technology

[0004] As the power grid continues to expand, the requirements for security are becoming increasingly stringent. Rapid disconnection after a power system fault is crucial for the safe and stable operation of the power system. Typically, in power system relay protection, the initiating elements need to be sensitive and reliable, capable of rapidly responding to all faults, yet they cannot be frequently activated when there are no faults.

[0005] Currently, existing relay protection is mainly divided into two types: traveling wave protection and power frequency protection. In traveling wave protection, the traveling wave initiating element often fails when the initial phase angle of the fault is zero or small. In power frequency protection, although the commonly used sudden change initiating element can sensitively and reliably respond to all fault types and is not affected by the initial phase angle of the fault, it will frequently start when the power system needs to oscillate.

[0006] Therefore, it is of great significance to study a starting element that is unaffected by the initial phase angle of the fault and power system oscillations, and can sensitively respond to all types of faults. Summary of the Invention

[0007] This application provides a startup method, apparatus, device, and computer storage medium based on sudden change, which can avoid the influence of fault initial phase angle and power system oscillation, and effectively ensure the sensitivity and reliability of transmission line startup.

[0008] In a first aspect, embodiments of this application provide a startup method based on mutation amount, the startup method based on mutation amount includes:

[0009] Acquire the sampling data of the first phase signal at the first and second sampling points of the three-phase signal at the installation location of the transmission line protection, and the sampling data of the second phase signal at the third and fourth sampling points; the first and second phase signals are any two of the three-phase signals; the third sampling point is spaced apart from the first sampling point. There are N sampling points, where M is any integer. The number of sampling points between the first and third sampling points is less than N. The number of sampling points between the first and second sampling points is N. The number of sampling points between the third and fourth sampling points is N. N is the number of sampling points for one signal cycle corresponding to the three-phase signal.

[0010] Based on the sampling data of the first phase signal at the first and second sampling points, and the sampling data of the second phase signal at the third and fourth sampling points, calculate the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal;

[0011] Based on the mutation criterion, the starting element of the transmission line is activated to calculate the fault that occurs on the transmission line.

[0012] In some possible implementations, based on the sampling data of the first phase signal at the first and second sampling points, and the sampling data of the second phase signal at the third and fourth sampling points, a change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, including:

[0013] When M is an odd number, the sampled data of the first sampling point and the sampled data of the third sampling point are added together to obtain the first sum, and the sampled data of the second sampling point and the sampled data of the fourth sampling point are added together to obtain the second sum;

[0014] Based on the first sum and the second sum, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated.

[0015] In some possible implementations, based on the sampling data of the first phase signal at the first and second sampling points, and the sampling data of the second phase signal at the third and fourth sampling points, a change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, including:

[0016] When M is even, the first difference is obtained by subtracting the sampled data of the first sampling point from the sampled data of the third sampling point, and the second difference is obtained by subtracting the sampled data of the second sampling point from the sampled data of the fourth sampling point.

[0017] Based on the first difference and the second difference, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated.

[0018] In some possible implementations, M is set to 1. A first sum is obtained by adding the sampled data from the first sampling point and the sampled data from the third sampling point, and a second sum is obtained by adding the sampled data from the second sampling point and the sampled data from the fourth sampling point. Based on the first and second sums, a change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, including:

[0019] The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the first calculation formula.

[0020] The first calculation formula is:

[0021]

[0022] Where k is the number of sampling points, k is less than or equal to K, Ig1 is the abrupt change criterion corresponding to phase a and phase b in the three phases a, b, and c, Ig2 is the abrupt change criterion corresponding to phase b and phase c in the three phases a, b, and c, Ig3 is the abrupt change criterion corresponding to phase a and phase c in the three phases a, b, and c, N is the number of samplings of the three-phase current in one cycle; Ia, Ib, and Ic are the instantaneous values ​​of each phase of the three-phase current.

[0023] In some possible implementations, M is set to 0. A first sum is obtained by adding the sampled data from the first sampling point and the sampled data from the third sampling point, and a second sum is obtained by adding the sampled data from the second sampling point and the sampled data from the fourth sampling point. Based on the first and second sums, a change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, including:

[0024] The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the second calculation formula.

[0025] The second calculation formula is:

[0026]

[0027] Where k is the number of sampling points, k is less than or equal to K, Ig1 is the abrupt change criterion corresponding to phase a and phase b in the three phases a, b, and c, Ig2 is the abrupt change criterion corresponding to phase b and phase c in the three phases a, b, and c, Ig3 is the abrupt change criterion corresponding to phase a and phase c in the three phases a, b, and c, N is the number of samplings of the three-phase current in one cycle; Ia, Ib, and Ic are the instantaneous values ​​of each phase of the three-phase current.

[0028] In some possible implementations, there are P first sampling points, and the P first sampling points are P consecutive sampling points, where P is a positive integer greater than or equal to 2.

[0029] According to the mutation criterion, the starting elements for starting transmission lines include:

[0030] If, among the mutation criteria corresponding to P first sampling points, there are Q consecutive first sampling points whose mutation criteria are all greater than the preset threshold value, the starting element of the transmission line is activated, where Q is a positive integer greater than or equal to 2 and Q is less than P.

[0031] After activating the starting elements of the transmission line, the start-up method based on abrupt changes further includes:

[0032] Based on the target sampling point and the sampling data after the target sampling point, the faults that occur on the transmission line are calculated;

[0033] The target sampling point and the starting sampling point are spaced Q sampling points apart. The target sampling point precedes the starting sampling point, and the starting sampling point is the last sampling point among the Q first sampling points.

[0034] Secondly, embodiments of this application provide a start-up device based on mutation amount, the start-up device based on mutation amount includes:

[0035] The acquisition module is used to acquire the sampling data of the first phase signal at the first and second sampling points of the three-phase signal at the installation location of the transmission line protection, and the sampling data of the second phase signal at the third and fourth sampling points; the first and second phase signals are any two phase signals from the three-phase signal; the third sampling point is spaced apart from the first sampling point. There are N sampling points, where M is any integer. The number of sampling points between the first and third sampling points is less than N. The number of sampling points between the first and second sampling points is N. The number of sampling points between the third and fourth sampling points is N. N is the number of sampling points for one signal cycle corresponding to the three-phase signal.

[0036] The calculation module is used to calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal based on the sampling data of the first phase signal at the first sampling point and the second sampling point, and the sampling data of the second phase signal at the third sampling point and the fourth sampling point.

[0037] The startup module is used to activate the startup elements of the transmission line based on the mutation criterion in order to calculate the faults that occur on the transmission line.

[0038] Thirdly, embodiments of this application provide a startup device based on mutation amount, the startup device based on mutation amount includes:

[0039] Processor and memory storing computer program instructions;

[0040] When the processor executes the computer program instructions, it implements the start-up method based on mutation amount provided in any of the embodiments of this application above.

[0041] Fourthly, embodiments of this application provide a computer storage medium storing computer program instructions, which, when executed by a processor, implement the mutation-based startup method provided in any of the above embodiments of this application.

[0042] Fifthly, embodiments of this application provide a computer program product in which instructions, when executed by a processor of an electronic device, cause the electronic device to perform a startup method based on mutation amount as provided in any of the embodiments of this application above.

[0043] The start-up method, apparatus, device, and computer storage medium based on sudden change in magnitude provided in this application calculate the sudden change criterion corresponding to the two phase signals by acquiring sampling data of any two phase signals in a three-phase signal that meets a preset sampling point interval, and then start the start-up element of the transmission line according to the calculated sudden change criterion. The start-up method, apparatus, device, and computer storage medium based on sudden change in magnitude provided in this application calculate the sudden change criterion of any two phases in the three-phase signal based on the symmetry of the three-phase signal and the symmetry between single-phase data, which can avoid the influence of the fault initial phase angle and power system oscillation, effectively ensuring the sensitivity and reliability of transmission line start-up. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a flowchart illustrating a mutation-based initiation method provided in an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of a transmission line structure according to an embodiment of the start-up method based on mutation amount provided in this application;

[0047] Figure 3 This is an example diagram of the three-phase current of the M-side protection after a transmission line fault, provided in one embodiment of this application.

[0048] Figure 4 This is the calculation result of the improved mutation amount starting element provided in an embodiment of this application;

[0049] Figure 5 This is a comparison diagram of an improved sudden change initiating element and a conventional sudden change initiating element provided in an embodiment of this application after a fault occurs in a power system oscillation;

[0050] Figure 6This is a schematic diagram of the structure of a start-up device based on mutation amount provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of the structure of a start-up device based on mutation amount provided in an embodiment of this application. Detailed Implementation

[0052] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0054] As described in the background section, traveling wave starting elements often fail when the initial phase angle of the fault is zero or small. While the sudden change starting elements commonly used in power frequency protection can sensitively and reliably respond to all fault types and are unaffected by the initial phase angle of the fault, they frequently start when the power system needs to oscillate. Therefore, it is of great significance to study a starting element that is unaffected by the initial phase angle of the fault and system oscillations, and can sensitively respond to all fault types.

[0055] To address the aforementioned issues, the inventors discovered through research that the traditional sudden change starting element in power frequency protection is implemented based on the following assumptions: when there is no fault in the transmission line, the voltage or current of each phase in the three-phase signal is completely consistent with that of one cycle ago; however, when a fault occurs, the voltage or current of each phase in the three-phase signal will change abruptly, so the starting can be determined based on whether there is a difference between the voltage or current of each phase and the voltage or current signal of that phase in the previous cycle.

[0056] Furthermore, the inventors realized that the starting principle assumptions of the aforementioned traditional sudden change starting elements do not actually hold true when power systems oscillate. Specifically, even if there is no fault in the power transmission line, the voltage and current of each phase in the transmission line will change with the oscillation. The voltage or current of each phase will differ from the voltage or current signal of the previous cycle due to the oscillation, thus causing the aforementioned traditional sudden change starting elements to start frequently during oscillations.

[0057] Based on the above findings, and in order to address the problems of the prior art, embodiments of this application provide a startup method, apparatus, device, storage medium, and computer program product based on mutation amount. It should be noted that the embodiments provided in this application are not intended to limit the scope of this application.

[0058] The mutation-based startup method provided in the embodiments of this application will be introduced first.

[0059] Figure 1 A flowchart illustrating a mutation-based startup method according to an embodiment of this application is shown. This mutation-based startup method is applied to an electronic device, which may include a server or a user terminal, etc. Figure 1 As shown, the mutation-based initiation method includes the following steps:

[0060] S110, acquire the sampling data of the first phase signal at the first and second sampling points of the three-phase signal at the transmission line protection installation point, and the sampling data of the second phase signal at the third and fourth sampling points; the first and second phase signals are any two phase signals in the three-phase signal; the third sampling point is spaced apart from the first sampling point. There are N sampling points, where M is any integer. The number of sampling points between the first and third sampling points is less than N. The number of sampling points between the first and second sampling points is N. The number of sampling points between the third and fourth sampling points is N. N is the number of sampling points for one signal cycle corresponding to the three-phase signal.

[0061] S120, Based on the sampling data of the first phase signal at the first sampling point and the second sampling point, and the sampling data of the second phase signal at the third sampling point and the fourth sampling point, calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal;

[0062] S130, based on the mutation criterion, activates the starting element of the transmission line to calculate the fault that occurs on the transmission line.

[0063] The start-up method based on abrupt changes in the present application calculates the abrupt change criterion corresponding to any two phases of the three-phase signal by acquiring sampling data that meets a preset sampling point interval, and then starts the starting element of the transmission line according to the calculated abrupt change criterion. The start-up method based on abrupt changes provided in this application calculates the abrupt change criterion for any two phases of the three-phase signal based on the symmetry of the three-phase signal and the symmetry between single-phase data, which can avoid the influence of the fault initial phase angle and power system oscillations, effectively ensuring the sensitivity and reliability of the transmission line start-up.

[0064] To facilitate subsequent understanding, before describing the specific implementation methods of steps 110 to 130 above, the implementation principle of this application will be introduced first.

[0065] The inventors of this application realized that, since a power system is three-phase symmetrical during normal operation, when no fault occurs, the voltage or current of each phase is the same magnitude as that of the adjacent phase, except for a difference of one-third of a cycle. Therefore, when the power system is operating normally, if the voltage or current of the adjacent phase is shifted by one-third of a cycle and then subtracted from the voltage or current of the current phase, the difference should be 0. However, when a power system fault occurs, the voltage or current of each of the three phases in the transmission line will change abruptly, and the above difference will no longer be 0, thus allowing for startup.

[0066] The problem of poor anti-oscillation performance of traditional sudden change initiation elements is actually due to the fact that the oscillation of three-phase power systems tends to increase gradually over time. In the aforementioned traditional sudden change initiation scheme, the difference is calculated by taking the sampled data of the same phase of the three-phase signal that is one cycle apart. When the three-phase power system oscillates, the difference between the sampled data that are one cycle apart is greatly affected by the oscillation, which makes the difference obvious and thus leads to false initiation.

[0067] This application takes into account that although the voltage or current of each phase in the three phases will change when the power system oscillates, the symmetry between phases is basically not destroyed. Furthermore, during normal operation of the power system, the signal amplitude of any sampled data in each phase and the sampled data separated by half a cycle are the same. Therefore, by utilizing the symmetry between the three-phase signals and the symmetry between single-phase data, the difference between any two symmetrical sampled data of any two phases can be selected, and the interval between the selected symmetrical sampled data is limited to less than one cycle. This makes the start-up scheme based on sudden change in the present application significantly more resistant to oscillation than traditional sudden change in the start-up element.

[0068] Based on the above implementation principle, the specific implementation methods of steps 110 to 130 will be described in detail below.

[0069] In S110, in specific implementation, relevant equipment such as current transformers and voltage transformers can be pre-installed in the power system transmission line. The relevant equipment can sample the three-phase signals at the protection installation point in real time according to the preset sampling period, and select the sampling data of the first phase signal at the first and second sampling points, and the sampling data of the second phase signal at the third and fourth sampling points from the multiple sampled data.

[0070] The first and second phase signals mentioned above are any two phase signals from the three-phase signals. The third sampling point mentioned above can be spaced apart from the first sampling point. There are N sampling points, where M is any integer. The number of sampling points between the first and third sampling points is less than N. The number of sampling points between the first and second sampling points can be N. The number of sampling points between the third and fourth sampling points is N. N is the number of sampling points for one signal cycle corresponding to the three-phase signal.

[0071] The aforementioned three-phase signals may specifically include at least one of three-phase voltage signals and three-phase current signals, and this application does not impose specific limitations on this.

[0072] In S120, specifically, after obtaining the sampling data of the first phase signal at the first and second sampling points and the sampling data of the second phase signal at the third and fourth sampling points of the three-phase signal at the transmission line protection installation point, the abrupt change criterion of the first phase signal and the second phase signal at the first and second sampling points can be calculated based on the sampling data of the first phase signal at the first and second sampling points and the sampling data of the second phase signal at the third and fourth sampling points.

[0073] Specifically, in some possible implementations, considering the different intervals between sampling data, the corresponding calculation method for the abrupt change criterion will also be adjusted. Therefore, the above-mentioned calculation of the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal based on the sampling data of the first phase signal at the first and second sampling points, and the sampling data of the second phase signal at the third and fourth sampling points, may include:

[0074] When M is an odd number, the sampled data of the first sampling point and the sampled data of the third sampling point are added together to obtain the first sum, and the sampled data of the second sampling point and the sampled data of the fourth sampling point are added together to obtain the second sum;

[0075] Based on the first sum and the second sum, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated.

[0076] Specifically, when M is an odd number, the sampling data corresponding to the first sampling point and the third sampling point have the same amplitude when the three-phase signal is normal, but the positive and negative signals are opposite. Therefore, by adding the sampling data of the first sampling point and the sampling data of the third sampling point to obtain the first sum, and adding the sampling data of the second sampling point and the sampling data of the fourth sampling point to obtain the second sum, and based on the calculated first sum and second sum, the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal is determined.

[0077] For example, the above-mentioned calculation of the mutation criterion based on the first sum and the second sum can specifically be to subtract the absolute value of the first sum and the absolute value of the second sum, and use the difference between the two absolute values ​​as the mutation criterion for the first sampling point corresponding to the first phase signal and the second phase signal. Alternatively, the absolute value of the difference can be taken and used as the mutation criterion, etc. This application does not impose any specific limitations on this.

[0078] In some possible implementations, similarly, considering the different intervals between sampling data, the corresponding abrupt change criterion calculation method will also be adjusted. Therefore, the above-mentioned calculation of the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal based on the sampling data of the first phase signal at the first and second sampling points, and the sampling data of the second phase signal at the third and fourth sampling points, may include:

[0079] When M is even, the first difference is obtained by subtracting the sampled data of the first sampling point from the sampled data of the third sampling point, and the second difference is obtained by subtracting the sampled data of the second sampling point from the sampled data of the fourth sampling point.

[0080] Based on the first difference and the second difference, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated.

[0081] Specifically, when M is an even number, the sampling data corresponding to the first sampling point and the third sampling point have the same amplitude and the same positive and negative signs when the three-phase signals are normal. Therefore, when calculating the mutation criterion, the first difference is obtained by subtracting the sampling data of the first sampling point from the sampling data of the third sampling point, and the second difference is obtained by subtracting the sampling data of the second sampling point from the sampling data of the fourth sampling point. Based on the calculated first difference and second difference, the mutation criterion of the first sampling point corresponding to the first phase signal and the second phase signal is determined.

[0082] For example, the above-mentioned criterion for calculating the mutation amount based on the first difference and the second difference may specifically be to subtract the absolute value of the first difference from the absolute value of the second difference, and then use the difference between the absolute values ​​of the two as the criterion for the mutation amount of the first sampling point corresponding to the first phase signal and the second phase signal, etc. This application does not impose any specific limitations on this.

[0083] In some possible implementations, to more reasonably and effectively calculate the abrupt change criterion, and to further reduce the impact of power system oscillations, specifically, when M is an odd number, the value of M can be 1. The sampled data from the first sampling point and the sampled data from the third sampling point are added to obtain a first sum, and the sampled data from the second sampling point and the sampled data from the fourth sampling point are added to obtain a second sum. Based on the first sum and the second sum, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, which may specifically include:

[0084] The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the first calculation formula.

[0085] The first calculation formula can be:

[0086]

[0087] Where k is the number of sampling points, k is less than or equal to K, Ig1 is the abrupt change criterion corresponding to phase a and phase b in the three phases a, b, and c, Ig2 is the abrupt change criterion corresponding to phase b and phase c in the three phases a, b, and c, Ig3 is the abrupt change criterion corresponding to phase a and phase c in the three phases a, b, and c, N is the number of samplings of the three-phase current in one cycle; Ia, Ib, and Ic are the instantaneous values ​​of each phase of the three-phase current.

[0088] In some possible implementations, to more reasonably and effectively calculate the abrupt change criterion, and to further reduce the impact of power system oscillations, specifically, when M is an even number, M is 0; the sampled data from the first sampling point and the sampled data from the third sampling point are added to obtain a first sum, and the sampled data from the second sampling point and the sampled data from the fourth sampling point are added to obtain a second sum; based on the first sum and the second sum, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, which may include:

[0089] The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the second calculation formula.

[0090] The second calculation formula can be shown in Formula 2:

[0091]

[0092] In Formula 2, k is the number of sampling points, k is less than or equal to K, Ig1 is the abrupt change criterion corresponding to phase a and phase b in the three phases a, b, and c, Ig2 is the abrupt change criterion corresponding to phase b and phase c in the three phases a, b, and c, Ig3 is the abrupt change criterion corresponding to phase a and phase c in the three phases a, b, and c, N is the number of samplings of the three-phase current in one cycle; Ia, Ib, and Ic are the instantaneous values ​​of each phase of the three-phase current.

[0093] It should be noted that, in addition to the case where M is 0 or 1, the value of M can also be other integers, such as -1. Furthermore, in the above embodiments, the sampling data involved in Formula 1 and Formula 2 are all instantaneous values ​​of the three-phase current. However, in other embodiments, the instantaneous values ​​of the three-phase current involved in Formula 1 and Formula 2 can be replaced with instantaneous values ​​of the three-phase voltage for calculating the abrupt change criterion. This application does not impose specific limitations on this.

[0094] In S130, in specific implementation, it can be determined whether the starting element of the transmission line needs to be activated by judging whether the above-mentioned mutation criterion is greater than a preset threshold value. If the calculated mutation criterion is greater than the preset threshold value, it can be confirmed that the starting element of the transmission line is activated, and accordingly, the fault occurring on the transmission line is calculated after the starting element is activated.

[0095] In some possible implementations, in order to effectively ensure the sensitivity and reliability of the transmission line startup and the accuracy of the related fault calculation after startup, there may be P first sampling points, where P first sampling points are P consecutive sampling points, and P is a positive integer greater than or equal to 2.

[0096] Based on the mutation criterion, the starting elements for power transmission lines may include:

[0097] If, among the mutation criteria corresponding to P first sampling points, there are Q consecutive first sampling points whose mutation criteria are all greater than the preset threshold value, the starting element of the transmission line is activated, where Q is a positive integer greater than or equal to 2 and Q is less than P.

[0098] After activating the starting elements of the transmission line, the start-up method based on abrupt changes may further include:

[0099] Based on the target sampling point and the sampling data after the target sampling point, the faults that occur on the transmission line are calculated;

[0100] The target sampling point and the starting sampling point are spaced Q sampling points apart. The target sampling point precedes the starting sampling point, and the starting sampling point is the last sampling point among the Q first sampling points.

[0101] In practice, there can be multiple consecutive first sampling points. Correspondingly, there can also be multiple consecutive second, third, and fourth sampling points corresponding to the first sampling points. Thus, based on the multiple consecutive first sampling points and the second, third, and fourth sampling points corresponding to each first sampling point, multiple consecutive abrupt change criteria for the first and second phase signals can be calculated.

[0102] If the mutation criterion corresponding to at least two consecutive first sampling points is greater than the preset threshold value, it indicates that the transmission line has obviously failed, and the starting element of the transmission line is activated.

[0103] After activating the starting element in the transmission line, considering that the activation time of the starting element is not consistent with the occurrence time of the fault in the transmission line, the fault calculation in practice can be based on the target sampling point and the sampling data after the target sampling point to calculate the fault that occurs on the transmission line. The target sampling point and the starting sampling point are separated by Q sampling points. The target sampling point precedes the starting sampling point, and the starting sampling point is the last sampling point among the Q first sampling points.

[0104] For example, if the value of Q is 2, and the mutation criterion corresponding to the first phase signal and the second phase signal of two consecutive first sampling points (such as sampling point 26 and sampling point 27) is greater than the preset threshold value, then the sampling time corresponding to sampling point 27 is started, and sampling point 27 is the starting sampling point. Then, the fault calculation is started by shifting the sampling time corresponding to the starting sampling point forward by 2 sampling point intervals, and the fault calculation is started with sampling point 25 as the starting time of the fault occurrence.

[0105] In this embodiment, a sudden change in starting criterion is calculated using signals from two adjacent phases. If used as a starting element for power frequency protection, it can achieve reliable and sensitive starting under any fault type, while remaining unaffected by system oscillations. If used as a backup starting element for traveling wave protection, since starting based on sudden change is itself unaffected by the initial phase angle of the fault, the dead zone problem in starting in traveling wave protection can be eliminated. In summary, the sudden change-based starting method provided in this application can avoid the influence of the initial phase angle of the fault and power system oscillations, effectively ensuring the sensitivity and reliability of transmission line starting.

[0106] To facilitate understanding of the mutation-based startup method provided in the above embodiments, the following describes the method using a specific embodiment.

[0107] The transmission line model applying the start-up method based on mutation amount of this application can be as follows: Figure 2 As shown, Figure 2 This is a schematic diagram of a transmission line structure based on a start-up method for mutation amount provided in an embodiment of this application. Figure 2 In this context, the line voltage level is set at 750kV, the line length MN is 400km, and the transmission line parameters and system impedance values ​​are shown in Tables 1 and 2. M and E N These are 1.05 times and 1.0 times the rated voltage, respectively. N The device is 30° behind. The protection device using this invention measures the voltage and current values ​​at the protection installation point using a voltage transformer (PT) and a current transformer (CT), respectively. The voltage transformer ratio is 7500:1, and the current transformer ratio is 2500:1. Assuming the system is in an oscillation state, the frequency difference between M and N is 3Hz, a phase a metallic ground fault occurs at point F during the oscillation, the power frequency microprocessor protection sampling rate is 1.2kHz, and the preset starting threshold is 0.1A (secondary side).

[0108] Table 1 Impedance parameters of transmission lines

[0109]

[0110] Table 2 System Impedance Parameters

[0111]

[0112] by Figure 2 The protection R on the M side of the MN line in the system shown M For example:

[0113] First, the three-phase current is sampled at the protection installation point of the transmission line, with N = 24 sampling points per cycle. Please refer to [link / reference]. Figure 3 , Figure 3 This is an example diagram of the three-phase current of the M-side protection after a transmission line fault, provided in one embodiment of this application. Sampling data from two cycles before and after the fault are selected. Figure 3 The following needs to be explained in the context of the demonstration. Figure 3 The vertical dashed line in the figure corresponds to the time when the line fault occurred, as set in the simulation experiment.

[0114] After obtaining the sampled data, the following calculations are performed based on the sampled instantaneous values ​​of the three-phase current according to Formula 1 above. Here, k represents the sampling point, and Ig1, Ig2, and Ig3 are the three calculated abrupt change criteria.

[0115] Please see below. Figure 4 , Figure 4 This is the calculation result of the improved mutation amount starting element provided in an embodiment of this application. Figure 4 The results of mutation amount criterion calculations for the period before and after the fault are selected and displayed. The calculated mutation amount criterions Ig1, Ig2, and Ig3 are compared with preset threshold values. If a mutation amount criterion Ig3 is found...g1 After the fault occurs, the second sampling point (sampling point 26) starts to exceed the threshold value, and the third sampling point (sampling point 27) meets the threshold twice in a row, which means the protection is determined to be activated.

[0116] exist Figure 4 As can be seen, when only oscillation occurs, the start-up scheme based on sudden changes in amplitude can reliably prevent the start-up element from starting, while it can start up quickly when a fault occurs during oscillation. It should be noted that the vertical dashed line corresponds to the time when the line fault occurred, set in the simulation experiment, and the horizontal dashed line represents a pre-set threshold value.

[0117] Figure 5 This is a comparison diagram of an improved sudden change initiating element and a traditional sudden change initiating element provided in an embodiment of this application after a fault occurs in a power system oscillation.

[0118] The formula for calculating the mutation criterion of traditional mutation initiation elements is shown in Formula 3:

[0119] I ga (k)=||I a (k)-I a (kN)|-|I a (kN)-I a (k-2N)|| Formula 3

[0120] exist Figure 5 In this study, for traditional sudden-change starting elements, the current of phase a in a three-phase system is used to calculate I. g And compare it with the mutation criterion Ig1 calculated in this application. From Figure 5 As can be seen, traditional instantaneous starting elements will frequently start when the system oscillates, regardless of whether a fault occurs. However, the improved instantaneous starting element proposed in this paper can resist system oscillations, thereby effectively ensuring the sensitivity and reliability of transmission line starting.

[0121] Based on the mutation-based startup method provided in the above embodiments, this application also provides a mutation-based startup device corresponding to the above mutation-based startup method. The following describes... Figure 6 A detailed introduction to start-up devices based on mutation amounts is provided.

[0122] Figure 6 A schematic diagram of the structure of a start-up device based on mutation amount provided in an embodiment of this application is shown. Figure 6 The mutation-based initiation device 600 shown includes:

[0123] The acquisition module 610 is used to acquire the sampling data of the first phase signal at the first and second sampling points of the three-phase signal at the installation point of the transmission line protection, and the sampling data of the second phase signal at the third and fourth sampling points; the first phase signal and the second phase signal are any two phase signals in the three-phase signal; the third sampling point is spaced apart from the first sampling point. There are N sampling points, where M is any integer. The number of sampling points between the first and third sampling points is less than N. The number of sampling points between the first and second sampling points is N. The number of sampling points between the third and fourth sampling points is N. N is the number of sampling points for one signal cycle corresponding to the three-phase signal.

[0124] The calculation module 620 is used to calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal based on the sampling data of the first phase signal at the first sampling point and the second sampling point, and the sampling data of the second phase signal at the third sampling point and the fourth sampling point.

[0125] The starting module 630 is used to start the starting element of the transmission line according to the mutation criterion in order to calculate the fault that occurs on the transmission line.

[0126] The start-up device based on sudden change in the present application, by setting corresponding functional modules, can acquire sampling data of any two phases of the three-phase signal that meet the preset sampling point interval, calculate the sudden change criterion corresponding to the two phase signals, and then start the starting element of the transmission line according to the calculated sudden change criterion. The start-up device based on sudden change in the present application calculates the sudden change criterion of any two phases of the three-phase signal based on the symmetry of the three-phase signal and the symmetry between single-phase data, which can avoid the influence of the fault initial phase angle and power system oscillation, and effectively ensure the sensitivity and reliability of the transmission line start-up.

[0127] In some possible implementations, considering the different intervals between sampling data, the corresponding mutation criterion calculation method will also be adjusted. Therefore, the above-mentioned calculation module 620 may specifically include:

[0128] The addition submodule can be used to add the sampled data of the first sampling point and the sampled data of the third sampling point to obtain a first sum when M is an odd number, and to add the sampled data of the second sampling point and the sampled data of the fourth sampling point to obtain a second sum.

[0129] The first calculation submodule can be used to calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal based on the first sum and the second sum.

[0130] In some possible implementations, similarly, considering the different intervals between sampled data, the corresponding mutation criterion calculation method will also be adjusted. Therefore, the above-mentioned calculation module 620 may specifically include:

[0131] The subtraction submodule, when M is even, subtracts the sampled data of the first sampling point from the sampled data of the third sampling point to obtain the first difference, and subtracts the sampled data of the second sampling point from the sampled data of the fourth sampling point to obtain the second difference.

[0132] The second calculation submodule can be used to calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal based on the first difference and the second difference.

[0133] In some possible implementations, to more reasonably and effectively calculate the abrupt change criterion, and to further reduce the impact of power system oscillations, M is set to 1. The sampled data from the first and third sampling points are added to obtain a first sum, and the sampled data from the second and fourth sampling points are added to obtain a second sum. Based on the first and second sums, the abrupt change criterion for the first sampling points corresponding to the first and second phase signals is calculated, which may specifically include:

[0134] The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the first calculation formula.

[0135] The first calculation formula can be:

[0136]

[0137] Where k is the number of sampling points, k is less than or equal to K, Ig1 is the abrupt change criterion corresponding to phase a and phase b in the three phases a, b, and c, Ig2 is the abrupt change criterion corresponding to phase b and phase c in the three phases a, b, and c, Ig3 is the abrupt change criterion corresponding to phase a and phase c in the three phases a, b, and c, N is the number of samplings of the three-phase current in one cycle; Ia, Ib, and Ic are the instantaneous values ​​of each phase of the three-phase current.

[0138] In some possible implementations, to more reasonably and effectively calculate the abrupt change criterion, and to further reduce the impact of power system oscillations, M is set to 0. The sampled data from the first and third sampling points are added to obtain a first sum, and the sampled data from the second and fourth sampling points are added to obtain a second sum. Based on the first and second sums, the abrupt change criterion for the first sampling points corresponding to the first and second phase signals is calculated, which may specifically include:

[0139] The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the second calculation formula.

[0140] The second calculation formula can be:

[0141]

[0142] Where k is the number of sampling points, k is less than or equal to K, Ig1 is the abrupt change criterion corresponding to phase a and phase b in the three phases a, b, and c, Ig2 is the abrupt change criterion corresponding to phase b and phase c in the three phases a, b, and c, Ig3 is the abrupt change criterion corresponding to phase a and phase c in the three phases a, b, and c, N is the number of samplings of the three-phase current in one cycle; Ia, Ib, and Ic are the instantaneous values ​​of each phase of the three-phase current.

[0143] In some possible implementations, in order to effectively ensure the sensitivity and reliability of the transmission line startup and the accuracy of subsequent fault calculation, there can be P first sampling points, where P first sampling points are P consecutive sampling points, and P is a positive integer greater than or equal to 2.

[0144] The aforementioned startup module 630 may specifically include:

[0145] If, among the mutation criteria corresponding to P first sampling points, there are Q consecutive first sampling points whose mutation criteria are all greater than the preset threshold value, the starting element of the transmission line is activated, where Q is a positive integer greater than or equal to 2 and Q is less than P.

[0146] After activating the starting elements of the transmission line, the start-up method based on abrupt changes may further include:

[0147] The fault calculation module can be used to calculate faults occurring on transmission lines based on the target sampling point and the sampling data after the target sampling point;

[0148] The target sampling point and the starting sampling point are spaced Q sampling points apart. The target sampling point precedes the starting sampling point, and the starting sampling point is the last sampling point among the Q first sampling points.

[0149] Figure 7 This is a schematic diagram of the structure of a start-up device based on mutation amount provided in an embodiment of this application.

[0150] A start-up device based on a mutation amount may include a processor 701 and a memory 702 storing computer program instructions.

[0151] Specifically, the processor 701 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0152] Memory 702 may include mass storage for data or instructions. For example, and not limitingly, memory 702 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 702 may include removable or non-removable (or fixed) media. Where appropriate, memory 702 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 702 is non-volatile solid-state memory.

[0153] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, and electrical, optical, or other physical / tangible memory storage devices. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the methods according to one aspect of this disclosure.

[0154] The processor 701 implements any of the mutation-based startup methods described above by reading and executing computer program instructions stored in the memory 702.

[0155] In one example, the data-based mutation-based startup device may also include a communication interface 703 and a bus 710. Wherein, as Figure 7 As shown, the processor 701, memory 702, and communication interface 703 are connected through bus 710 and complete communication with each other.

[0156] The communication interface 703 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0157] Bus 710 includes hardware, software, or both, that couples components of a start-up device together based on a mutation amount. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 710 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0158] The mutation-based startup device executes the mutation-based startup method in the embodiments of this application, thereby achieving... Figure 1 The description describes a start-up method based on mutation amount.

[0159] Furthermore, in conjunction with the mutation-based startup method in the above embodiments, this application embodiment can provide a computer storage medium for implementation. This computer storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the mutation-based startup methods in the above embodiments.

[0160] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0161] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0162] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0163] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0164] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method of starting based on a mutation variable, characterized by, include: The sampling data of a first phase signal at a first sampling point and a second sampling point and the sampling data of a second phase signal at a third sampling point and a fourth sampling point are acquired at a protection installation position of a power transmission line, the first phase signal and the second phase signal are any two phase signals of the three phase signals, the third sampling point is spaced apart from the first sampling point by (M ) sampling points, M is any integer, the number of sampling points between the first sampling point and the third sampling point is less than N, the number of sampling points between the first sampling point and the second sampling point is N, the number of sampling points between the third sampling point and the fourth sampling point is N, and N is the number of sampling points of a signal period corresponding to the three phase signals. Based on the sampling data of the first phase signal at the first sampling point and the second sampling point, and the sampling data of the second phase signal at the third sampling point and the fourth sampling point, calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal; Based on the mutation criterion, the starting element of the transmission line is activated to calculate the fault that occurred on the transmission line; The step of calculating the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal based on the sampling data of the first phase signal at the first sampling point and the second sampling point, and the sampling data of the second phase signal at the third sampling point and the fourth sampling point, includes: When M is an odd number, the sampled data of the first sampling point and the sampled data of the third sampling point are added together to obtain a first sum, and the sampled data of the second sampling point and the sampled data of the fourth sampling point are added together to obtain a second sum; Based on the first sum and the second sum, calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal; Alternatively, the step of calculating the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal based on the sampling data of the first phase signal at the first sampling point and the second sampling point, and the sampling data of the second phase signal at the third sampling point and the fourth sampling point, includes: When M is even, the first difference is obtained by subtracting the sampled data of the first sampling point from the sampled data of the third sampling point, and the second difference is obtained by subtracting the sampled data of the second sampling point from the sampled data of the fourth sampling point. Based on the first difference and the second difference, the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal is calculated.

2. The method according to claim 1, characterized in that, The value of M is 1. The sampling data of the first sampling point and the sampling data of the third sampling point are added together to obtain the first sum, and the sampling data of the second sampling point and the sampling data of the fourth sampling point are added together to obtain the second sum. Based on the first sum and the second sum, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, including: The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the first calculation formula. The first calculation formula is: Where k is the number of sampling points, and k is less than or equal to K. The criteria for determining the mutation amounts corresponding to phase a and phase b in the calculated three phases a, b, and c are as follows: The criteria for determining the mutation amounts corresponding to phase b and phase c in the calculated three phases a, b, and c are as follows: The criteria for the abrupt change of phase a and phase c in the calculated three phases a, b, and c are given by N, which is the number of samples of the three-phase current in one cycle. , , These are the instantaneous values ​​of the three-phase currents for each phase.

3. The method according to claim 1, characterized in that, When M is 0, the first difference is obtained by subtracting the sampled data of the first sampling point from the sampled data of the third sampling point, and the second difference is obtained by subtracting the sampled data of the second sampling point from the sampled data of the fourth sampling point. Based on the first difference and the second difference, the abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated, including: The abrupt change criterion for the first sampling point corresponding to the first phase signal and the second phase signal is calculated using the second calculation formula. The second calculation formula is: Where k is the number of sampling points, and k is less than or equal to K. The criteria for determining the mutation amounts corresponding to phase a and phase b in the calculated three phases a, b, and c are as follows: The criteria for determining the mutation amounts corresponding to phase b and phase c in the calculated three phases a, b, and c are as follows: The criteria for the abrupt change of phase a and phase c in the calculated three phases a, b, and c are given by N, which is the number of samples of the three-phase current in one cycle. , , These are the instantaneous values ​​of the three-phase currents for each phase.

4. The method according to claim 1, characterized in that, There are P first sampling points, and the P first sampling points are P consecutive sampling points, where P is a positive integer greater than or equal to 2; The starting element for activating the transmission line based on the mutation criterion includes: If, among the mutation criteria corresponding to the P first sampling points, there are Q consecutive first sampling points whose mutation criteria are all greater than a preset threshold value, the starting element of the transmission line is activated, where Q is a positive integer greater than or equal to 2 and Q is less than P. After activating the starting element of the transmission line, the method further includes: Based on the target sampling point and the sampling data after the target sampling point, the faults occurring on the transmission line are calculated; The target sampling point is spaced Q sampling points away from the starting sampling point, the target sampling point precedes the starting sampling point, and the starting sampling point is the last sampling point among the Q first sampling points.

5. A start-up device based on mutation amount, characterized in that, The device includes: The acquisition module is used to acquire the sampling data of the first phase signal at the first and second sampling points of the three-phase signal at the installation point of the transmission line protection, and the sampling data of the second phase signal at the third and fourth sampling points; the first phase signal and the second phase signal are any two phase signals of the three-phase signal; the third sampling point is spaced apart from the first sampling point by (…). M is any integer, and the number of sampling points between the first sampling point and the third sampling point is less than N. The number of sampling points between the first sampling point and the second sampling point is N, and the number of sampling points between the third sampling point and the fourth sampling point is N. N is the number of sampling points for one signal cycle corresponding to the three-phase signal. The calculation module is used to calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal based on the sampling data of the first phase signal at the first sampling point and the second sampling point, and the sampling data of the second phase signal at the third sampling point and the fourth sampling point; A startup module is used to activate the startup element of the transmission line according to the mutation criterion, so as to calculate the fault that occurs on the transmission line; The calculation module is specifically used to: when M is an odd number, add the sampled data of the first sampling point and the sampled data of the third sampling point to obtain a first sum, and add the sampled data of the second sampling point and the sampled data of the fourth sampling point to obtain a second sum; Based on the first sum and the second sum, calculate the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal; Alternatively, the calculation module is specifically used to: when M is an even number, subtract the sampled data of the first sampling point from the sampled data of the third sampling point to obtain a first difference, and subtract the sampled data of the second sampling point from the sampled data of the fourth sampling point to obtain a second difference; Based on the first difference and the second difference, the abrupt change criterion of the first sampling point corresponding to the first phase signal and the second phase signal is calculated.

6. A start-up device based on mutation amount, characterized in that, The device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, it implements the start-up method based on mutation as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, implement the start-up method based on mutation amount as described in any one of claims 1-4.

8. A computer program product, characterized in that, When the instructions in the computer program product are executed by the processor of the electronic device, the electronic device executes the start-up method based on mutation amount as described in any one of claims 1-4.

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