A safety detection method, device and storage medium for changing a secondary circuit

Abstract

The present invention discloses a safety detection method, device, and storage medium for changing a secondary circuit. The method comprises: identifying a first interval and a second interval in a power grid master station; constructing a first basic matrix based on the extreme value differences in current of each line in the first interval; constructing a second basic matrix and a third basic matrix based on the extreme value differences and cumulative differences in current between each line in the first interval and each line in the second interval; constructing a first change matrix based on the extreme value differences in current of each line in the first interval; constructing a second change matrix and a third change matrix based on the extreme value differences and cumulative differences in current between each line in the first interval and each line in the second interval; and performing safety detection on the change of the secondary circuit in the second interval based on the first basic matrix and the first change matrix, the second basic matrix and the second change matrix, and the third basic matrix and the third change matrix. The method is highly effective and practical.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid relay protection, and in particular to a safety detection method, device and storage medium for changing a secondary circuit. Background Art

[0002] In the main station of the power grid, changes in the secondary circuit outside the protection zone may affect the safe operation of the power grid. Under current technical conditions, the out-of-zone fault detection corresponding to the longitudinal differential protection is usually carried out after the secondary circuit is started. When waveform data is generated at the corresponding interval, the correctness of the secondary circuit outside the protection zone is judged by analyzing the waveform data. This approach has poor timeliness and availability. Summary of the Invention

[0003] In view of this, the present invention provides a method, device and storage medium for safety detection of secondary circuit changes, so as to improve the timeliness and availability of detecting secondary circuit changes.

[0004] A first aspect of the present invention provides a safety detection method for changing a secondary circuit, comprising:

[0005] Identifying, in the power grid master station, a first interval in which the secondary circuit is planned to be maintained unchanged and a second interval in which the secondary circuit is planned to be changed;

[0006] Before the secondary circuit of the second interval is changed, a first basic matrix is ​​constructed according to the extreme value differences in current of each circuit of the first interval;

[0007] Before the secondary circuit of the second interval is changed, a second basic matrix and a third basic matrix are constructed according to the extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval;

[0008] After the secondary circuit of the second interval is changed, a first change matrix is ​​constructed according to the extreme value differences in current of each circuit of the first interval;

[0009] After the secondary circuit of the second interval is changed, constructing a second change matrix and a third change matrix according to the extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval;

[0010] The second interval change secondary loop is safety checked based on the difference between the first basic matrix and the first change matrix, the difference between the second basic matrix and the second change matrix, and the difference between the third basic matrix and the third change matrix.

[0011] A second aspect of the present invention provides a safety detection device for changing a secondary circuit, comprising:

[0012] An interval identification module is used to identify, in the power grid master station, a first interval in which the secondary circuit is planned to be maintained unchanged and a second interval in which the secondary circuit is planned to be changed;

[0013] A first basic information processing module is configured to construct a first basic matrix based on the extreme value differences in current of each circuit of the first interval before the secondary circuit of the second interval is changed;

[0014] a second basic information processing module, configured to construct a second basic matrix and a third basic matrix based on extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval before the secondary circuit of the second interval is changed;

[0015] a first change information processing module, configured to construct a first change matrix according to the extreme value differences in current of each circuit of the first interval after the secondary circuit of the second interval is changed;

[0016] a second change information processing module, configured to construct a second change matrix and a third change matrix based on extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval after the secondary circuit of the second interval is changed;

[0017] A change safety detection module is used to perform safety detection on the second interval change secondary loop based on the difference between the first basic matrix and the first change matrix, the difference between the second basic matrix and the second change matrix, and the difference between the third basic matrix and the third change matrix.

[0018] A third aspect of the present invention provides an electronic device, comprising:

[0019] at least one processor; and

[0020] a memory communicatively connected to the at least one processor; wherein,

[0021] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the safety detection method for changing the secondary circuit as described in the first aspect above.

[0022] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the safety detection method for changing a secondary circuit as described in the first aspect above.

[0023] A fifth aspect of the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the safety detection method for changing the secondary circuit as described in the first aspect above.

[0024] In this embodiment, a first interval in which a secondary circuit is planned to remain unchanged and a second interval in which a secondary circuit is planned to be changed are respectively identified in the power grid master station; before the secondary circuit of the second interval is changed, a first basic matrix is ​​constructed based on the extreme value differences in current of each line of the first interval; before the secondary circuit of the second interval is changed, a second basic matrix and a third basic matrix are constructed based on the extreme value differences and cumulative differences in current between each line of the first interval and each line of the second interval; after the secondary circuit of the second interval is changed, a first change matrix is ​​constructed based on the extreme value differences in current of each line of the first interval; after the secondary circuit of the second interval is changed, a second change matrix and a third change matrix are constructed based on the extreme value differences and cumulative differences in current between each line of the first interval and each line of the second interval; and a safety check is performed on the changed secondary circuit of the second interval based on the difference between the first basic matrix and the first change matrix, the difference between the second basic matrix and the second change matrix, and the difference between the third basic matrix and the third change matrix. This embodiment can directly apply online data diagnosis before and after the secondary circuit is put into operation, and does not rely on the analysis of protection startup data. The correctness of the secondary circuit change can be detected when the newly protected secondary circuit is put into operation, and it has strong timeliness. At the same time, it is plug-and-play based on the scheduling and information security master station data, and has high practicality. It can be widely used in monitoring the secondary circuit protection of the entire network with a information security master station, and has a wide range of applications.

[0025] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a flow chart of a safety detection method for changing a secondary circuit provided in Example 1 of the present invention.

[0028] Figure 2 It is a structural diagram of a safety detection device for changing a secondary circuit provided in the second embodiment of the present invention.

[0029] Figure 3 This is a structural diagram of an electronic device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can cover sequential implementations other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Example 1

[0033] See also Figure 1 , shows a flow chart of a safety detection method for changing a secondary circuit provided by a first embodiment of the present invention. This method can be executed by a safety detection device for changing a secondary circuit. The safety detection device for changing a secondary circuit can be implemented in the form of hardware and / or software. The safety detection device for changing a secondary circuit can be configured in an electronic device. Figure 1 As shown, the method includes:

[0034] Step 101: Identify, in a power grid master station, a first interval in which a secondary circuit is planned to be maintained unchanged and a second interval in which a secondary circuit is planned to be changed.

[0035] In actual applications, the power equipment in the main station of the power grid includes primary circuits and secondary circuits. The primary circuit includes transformers, circuit breakers, disconnectors, busbars, lightning arresters, capacitors, etc., and the secondary circuit includes measurement, protection, control, communication, etc. Different secondary circuits can form a place for receiving, converting, transmitting and distributing electric energy.

[0036] In the design and construction of the main power grid station, the incoming line, main transformer high voltage, main transformer low voltage, main transformer, low voltage outgoing line and other parts are combined separately, and each part is called a bay.

[0037] For example, the incoming line interval starts from the cable head at the end of the line and is composed of the line side earth knife, line side knife switch, switch side earth knife, switch, bus side knife switch, and bus ground knife. All electrical equipment constitute the incoming line interval.

[0038] When renovating the intervals of a substation, which involves the renovation of the primary circuit and the secondary circuit, from the perspective of renovation, the intervals where the secondary circuit is planned to remain unchanged can be identified and recorded as the first interval, and the intervals where the secondary circuit is planned to be changed can be identified and recorded as the second interval.

[0039] In this embodiment, the local IP (Internet Protocol) address uses a whitelist mechanism, which complies with the relevant control requirements of the power secondary circuit.

[0040] This embodiment can be implemented as a plug-and-play device with a small size and high flexibility. If the secondary intelligent operation and maintenance team of the power dispatching and control center receives a protection circuit change work plan, the data information of the corresponding secondary circuit is set in this device, and according to the time node of the work plan, the device is connected to the dedicated USB (Universal Serial Bus) interface of the power grid master station to receive data, complete data analysis and output the results of the circuit analysis.

[0041] Step 102: Before the secondary circuit of the second interval is changed, a first basic matrix is ​​constructed according to the extreme value differences in current of each circuit of the first interval.

[0042] In this embodiment, before the secondary circuit of the second interval is changed, the differences in the extreme values ​​of current (such as maximum value, minimum value, etc.) of each line of the first interval can be calculated, and these differences can be recorded in the form of a matrix to obtain a first basic matrix.

[0043] In a specific implementation, the line of the first interval has three phases, namely, phase A, phase B, and phase C.

[0044] Before the secondary circuit of the second interval is changed, the absolute value of the difference between the currents of any two phases (phase A, phase B, phase C) of the line of the first interval is taken as the first deviation value.

[0045] For the same line in the first interval, the maximum value of the first deviation value is taken as the first basic value.

[0046] For all lines of the first interval, first basis values ​​are combined into a first basis matrix.

[0047] Then, the first fundamental matrix can be expressed as:

[0048]

[0049] Among them, I base1n is the first fundamental matrix, I An is the phase A current of the nth circuit, I Bn is the B-phase current of the nth circuit, I Cn is the C-phase current of the nth circuit, and max is the function for finding the maximum value.

[0050] In general, the first fundamental matrix satisfies the following conditions:

[0051]

[0052] Among them, λ is the adjustment coefficient.

[0053] Step 103 : Before the secondary circuit of the second interval is changed, construct a second basic matrix and a third basic matrix according to the extreme value difference and cumulative difference in current between each circuit of the first interval and each circuit of the second interval.

[0054] In this embodiment, before the secondary circuit of the second interval is changed, the differences in the extreme values ​​of current (such as maximum value, minimum value, etc.) between each line of the first interval and each line of the second interval can be calculated, and these differences can be recorded in the form of a matrix to obtain a second basic matrix, and the differences in current between each line of the first interval and each line of the second interval are calculated and accumulated, and these accumulations are recorded in the form of a matrix to obtain a third basic matrix.

[0055] In a specific implementation, the line of the second interval has three phases, namely, phase A, phase B, and phase C.

[0056] Before the secondary circuit of the second interval is changed, the lines of the first interval are aligned with the lines of the second interval so that the lines of the first interval correspond to the lines of the second interval.

[0057] If the alignment is completed, the absolute value of the difference between the current of the line of the first interval and the current of the line of the second interval in the same phase (phase A, phase B, phase C) is taken as the second deviation value.

[0058] On the one hand, for the same line in the first interval and the same line in the second interval, the maximum value of the second deviation value is taken as the second basic value.

[0059] For all lines of the first interval and all lines of the second interval, the first basic values ​​are combined into a second basic matrix.

[0060] Then, the second fundamental matrix can be expressed as:

[0061]

[0062] Among them, I base2n is the second fundamental matrix, I An is the phase A current of the nth line in the first interval, I Bn is the B-phase current of the nth line in the first interval, I Cn is the C-phase current of the nth line in the first interval, I WA1 is the phase A current of the nth line in the second interval, I WB1 is the B-phase current of the nth line in the second interval, I WC1 is the C-phase current of the nth line in the second interval, and max is the function for finding the maximum value.

[0063] On the other hand, for the same line in the first interval and the same line in the second interval, the second deviation values ​​are summed to serve as the third basic value.

[0064] For all the lines of the first interval and all the lines of the second interval, third basic values ​​are combined into a third basic matrix.

[0065] Then, the third fundamental matrix can be expressed as:

[0066]

[0067] Among them, I base3n is the third fundamental matrix, I An is the phase A current of the nth line in the first interval, I Bn is the B-phase current of the nth line in the first interval, I Cn is the C-phase current of the nth line in the first interval, I WA1 is the phase A current of the nth line in the second interval, I WB1 is the B-phase current of the nth line in the second interval, I WC1 is the C-phase current of the n-th line in the second interval, and sum is the summing function.

[0068] Step 104: After the secondary circuit of the second interval is changed, a first change matrix is ​​constructed according to the extreme value differences in current of each circuit of the first interval.

[0069] In this embodiment, after the secondary circuit of the second interval is changed, the differences in the extreme values ​​of current (such as maximum value, minimum value, etc.) of each line of the first interval can be calculated, and these differences can be recorded in the form of a matrix to obtain a first change matrix.

[0070] In general, the first basic matrix is ​​constructed in the same manner as the first variation matrix.

[0071] In a specific implementation, after the secondary circuit of the second interval is changed, the absolute value of the difference between the currents of any two phases (phase A, phase B, phase C) of the line of the first interval is taken as the third deviation value.

[0072] For the same line in the first interval, the maximum value of the third deviation value is taken as the first change value.

[0073] For all lines in the first interval, the first change values ​​are combined into a first change matrix.

[0074] Then, the first change matrix can be expressed as:

[0075]

[0076] Among them, I Cbase1n is the first change matrix, I CA1 is the phase A current of the nth circuit, I CB1 is the B-phase current of the nth circuit, I CC1 is the C-phase current of the nth circuit, and max is the function for finding the maximum value.

[0077] In general, the first change matrix satisfies the following conditions:

[0078]

[0079] Among them, λ is the adjustment coefficient.

[0080] Step 105 : After the secondary circuit of the second interval is changed, a second change matrix and a third change matrix are constructed according to the extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval.

[0081] In this embodiment, after the secondary circuit of the second interval is changed, the differences in the extreme values ​​of current (such as maximum value, minimum value, etc.) between each line of the first interval and each line of the second interval can be calculated, and these differences can be recorded in the form of a matrix to obtain a second change matrix, and the differences in current between each line of the first interval and each line of the second interval are calculated and accumulated, and these accumulations are recorded in the form of a matrix to obtain a third change matrix.

[0082] Generally, the second basic matrix is ​​constructed in the same manner as the second variation matrix, and the third basic matrix is ​​constructed in the same manner as the third variation matrix.

[0083] In a specific implementation, after the secondary loop of the second interval is changed, the lines of the first interval are aligned with the lines of the second interval so that the lines of the first interval correspond to the lines of the second interval.

[0084] If alignment is completed, the absolute value of the difference between the current of the line of the first interval and the current of the line of the second interval in the same phase (phase A, phase B, phase C) is taken as the fourth deviation value;

[0085] On the one hand, for the same line in the first interval and the same line in the second interval, the maximum value of the fourth deviation value is taken as the second change value.

[0086] For all the lines of the first interval and all the lines of the second interval, the first change values ​​are combined into a second change matrix.

[0087] Then, the second change matrix can be expressed as:

[0088]

[0089] Among them, I Cbase2n is the second change matrix, I CA1 is the phase A current of the nth line in the first interval, I CB1 is the B-phase current of the nth line in the first interval, I CC1 is the C-phase current of the nth line in the first interval, I CWA1 is the phase A current of the nth line in the second interval, I CWB1 is the B-phase current of the nth line in the second interval, I CWC1 is the C-phase current of the nth line in the second interval, and max is the function for finding the maximum value.

[0090] On the other hand, for the same line in the first interval and the same line in the second interval, the second change values ​​are summed to obtain a third change value.

[0091] For all the lines of the first interval and all the lines of the second interval, the third change values ​​are combined into a third change matrix.

[0092] Then, the third change matrix can be expressed as:

[0093]

[0094] Among them, I Cbase3n is the third change matrix, I CA1 is the phase A current of the nth line in the first interval, I CB1 is the B-phase current of the nth line in the first interval, I CC1 is the C-phase current of the nth line in the first interval, I CWA1 is the phase A current of the nth line in the second interval, I CWB1 is the B-phase current of the nth line in the second interval, I CWC1is the C-phase current of the n-th line in the second interval, and sum is the summing function.

[0095] Step 106 : Perform safety detection on the second interval change secondary loop based on the difference between the first basic matrix and the first change matrix, the difference between the second basic matrix and the second change matrix, and the difference between the third basic matrix and the third change matrix.

[0096] In a specific implementation, the first basic matrix is ​​compared with the first change matrix, the second basic matrix is ​​compared with the second change matrix, and the third basic matrix is ​​compared with the third change matrix. Based on the difference between the first basic matrix and the first change matrix, the difference between the second basic matrix and the second change matrix, and the difference between the third basic matrix and the third change matrix, the safety detection of the second interval change secondary loop is performed.

[0097] In one embodiment of the present invention, step 106 may include the following steps:

[0098] Step 1061: Calculate the change rate of the current of each line in the first interval according to the difference between the first basic matrix and the first change matrix.

[0099] In this embodiment, the change rate of the current of each line in the first interval may be calculated according to the difference between the first basic matrix and the first change matrix.

[0100] Exemplarily, the absolute value of the difference between the first basic matrix and the first change matrix is ​​taken to obtain the fifth deviation value.

[0101] The minimum value is taken between the first variation matrices of the first basic matrix to obtain the reference value.

[0102] The ratio between the fifth deviation value and the reference value is calculated as the change rate of the current of each line in the first interval.

[0103] Then, the rate of change of current in each line in the first interval can be expressed as:

[0104]

[0105] Among them, I ebase1n is the rate of change of current in each line in the first interval, I base1n is the first fundamental matrix, I Cbase1n is the first change matrix, and min is the function for finding the minimum value.

[0106] Step 1062: Query the current threshold set for the power grid master station.

[0107] In this embodiment, the current threshold ε set for the power grid master station may be queried from a local database.

[0108] The current threshold ε may be a fixed value or a value that changes dynamically according to the strategy of the power grid.

[0109] For example, the current time can be read from the local operating system to query the season (such as summer, winter, etc.) in which the current time is located. There are certain differences in factors such as power load and current size in different seasons. Therefore, the current threshold set for the power grid master station in the season is queried to achieve adaptive seasonal adjustment of the current threshold.

[0110] Step 1063: Construct a first difference matrix and a first threshold matrix according to the difference between the second basic matrix and the second change matrix.

[0111] In this embodiment, a first difference matrix and a first threshold matrix may be constructed according to the difference between the second basic matrix and the second change matrix, respectively, to achieve adaptive comparison.

[0112] Exemplarily, the difference between the second basic matrix and the second change matrix is ​​calculated to obtain the first deviation matrix.

[0113] The first deviation matrix is ​​multiplied by a preset identity matrix to obtain a first difference matrix.

[0114] The first deviation matrix is ​​multiplied by the preset first weight matrix to obtain the first threshold matrix. Then, the first difference matrix can be expressed as:

[0115] I ebase2n =(I base2n -I Cbase2n )E

[0116] The first threshold matrix can be expressed as:

[0117]

[0118] Among them, I ebase2n is the first difference matrix, I base2n is the second fundamental matrix, I Cbase2n is the second change matrix, E is the unit matrix, are weights, and

[0119] In the operation and maintenance platform, the corresponding weight of each interval can be automatically set. When the wiring of a wiring diagram changes, the operation and maintenance platform will automatically change the weight of each interval. The operation and maintenance personnel will refine the corresponding weight according to relevant rules.

[0120] Step 1064: Construct a second difference matrix and a second threshold matrix according to the difference between the third basic matrix and the third change matrix.

[0121] In this embodiment, a second difference matrix and a second threshold matrix may be constructed according to the difference between the third basic matrix and the third change matrix to implement adaptive comparison.

[0122] Exemplarily, the difference between the third basic matrix and the third change matrix is ​​calculated as the second deviation matrix.

[0123] The second difference matrix is ​​obtained by taking half the product of the bias matrix and the transposed matrix of the bias matrix.

[0124] The second deviation matrix is ​​multiplied by a preset second weight matrix to obtain a second threshold matrix.

[0125] Then, the second difference matrix can be expressed as:

[0126]

[0127] The second threshold matrix can be expressed as:

[0128]

[0129] Among them, I ebase3n is the second difference matrix, I base3n is the third fundamental matrix, I Cbase3n is the third change matrix, α1,α2,…,α n are all weights, and α1+α2+…+α n =1.

[0130] Step 1065: If the change rates are all less than the current threshold, the first difference matrix is ​​less than the first threshold matrix, and the second difference matrix is ​​less than the second threshold matrix, it is determined that the second interval change secondary circuit is safe.

[0131] In this embodiment, the change rate of the current of each line in the first interval is compared with the current threshold, the first difference matrix is ​​compared with the first threshold matrix, and the second difference matrix is ​​compared with the second threshold matrix.

[0132] If the rate of change of current in each line of the first interval is less than the current threshold, the first differential matrix is ​​less than the first threshold matrix, and the second differential matrix is ​​less than the second threshold matrix, it can be determined that it is safe to change the secondary circuit of the second interval; otherwise, it is determined that there is a risk in changing the secondary circuit of the second interval.

[0133] Then, the judgment condition for the safety of the secondary circuit of the second interval change can be expressed as:

[0134]

[0135]

[0136]

[0137] When the above three conditions are met at the same time, it can be determined that the second interval secondary circuit change is safe. When any of the above conditions are not met, it can be determined that there is a risk in the second interval secondary circuit change.

[0138] In this embodiment, a first interval in which a secondary circuit is planned to remain unchanged and a second interval in which a secondary circuit is planned to be changed are respectively identified in the power grid master station; before the secondary circuit of the second interval is changed, a first basic matrix is ​​constructed based on the extreme value differences in current of each line of the first interval; before the secondary circuit of the second interval is changed, a second basic matrix and a third basic matrix are constructed based on the extreme value differences and cumulative differences in current between each line of the first interval and each line of the second interval; after the secondary circuit of the second interval is changed, a first change matrix is ​​constructed based on the extreme value differences in current of each line of the first interval; after the secondary circuit of the second interval is changed, a second change matrix and a third change matrix are constructed based on the extreme value differences and cumulative differences in current between each line of the first interval and each line of the second interval; and a safety check is performed on the changed secondary circuit of the second interval based on the difference between the first basic matrix and the first change matrix, the difference between the second basic matrix and the second change matrix, and the difference between the third basic matrix and the third change matrix. This embodiment can directly apply online data diagnosis before and after the secondary circuit is put into operation, and does not rely on the analysis of protection startup data. The correctness of the secondary circuit change can be detected when the newly protected secondary circuit is put into operation, and it has strong timeliness. At the same time, it is plug-and-play based on the scheduling and information security master station data, and has high practicality. It can be widely used in monitoring the secondary circuit protection of the entire network with a information security master station, and has a wide range of applications.

[0139] Example 2

[0140] See also Figure 2 , shows a schematic structural diagram of a safety detection device for changing a secondary circuit provided by the second embodiment of the present invention. Figure 2 As shown, the device includes:

[0141] An interval identification module 201 is used to identify, in the power grid master station, a first interval in which the secondary circuit is planned to be maintained unchanged and a second interval in which the secondary circuit is planned to be changed;

[0142] A first basic information processing module 202 is configured to construct a first basic matrix based on the extreme value differences in current of each circuit in the first interval before the secondary circuit in the second interval is changed;

[0143] A second basic information processing module 203 is configured to construct a second basic matrix and a third basic matrix based on the extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval before the secondary circuit of the second interval is changed;

[0144] A first change information processing module 204 is configured to construct a first change matrix based on the extreme value differences in current of each circuit in the first interval after the secondary circuit in the second interval is changed;

[0145] A second change information processing module 205 is configured to construct a second change matrix and a third change matrix based on the extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval after the secondary circuit of the second interval is changed;

[0146] The change safety detection module 206 is used to perform safety detection on the second interval change secondary loop based on the difference between the first basic matrix and the first change matrix, the difference between the second basic matrix and the second change matrix, and the difference between the third basic matrix and the third change matrix.

[0147] In one embodiment of the present invention, the first basic information processing module 202 is further configured to:

[0148] Before the secondary circuit of the second interval is changed, taking the absolute value of the difference between any two phase currents of the line of the first interval as the first deviation value;

[0149] For the same line in the first interval, taking the maximum value of the first deviation value as the first base value;

[0150] For all lines of the first interval, the first basic values ​​are combined into a first basic matrix.

[0151] In one embodiment of the present invention, the second basic information processing module 203 is further configured to:

[0152] Before changing the secondary circuit of the second interval, aligning each circuit of the first interval with each circuit of the second interval;

[0153] If the alignment is completed, taking the absolute value of the difference between the currents of the line of the first interval and the line of the second interval in the same phase as the second deviation value;

[0154] For the same line in the first interval and the same line in the second interval, taking the maximum value of the second deviation value as the second base value;

[0155] For all lines of the first interval and all lines of the second interval, forming a second basic matrix with the first basic values;

[0156] For the same route in the first interval and the same route in the second interval, summing the second deviation values ​​to obtain a third base value;

[0157] For all lines of the first interval and all lines of the second interval, the third basic values ​​are combined into a third basic matrix.

[0158] In one embodiment of the present invention, the first change information processing module 204 is further configured to:

[0159] After the secondary circuit of the second interval is changed, taking the absolute value of the difference between any two phase currents of the line of the first interval as the third deviation value;

[0160] For the same line in the first interval, taking the maximum value of the third deviation value as the first change value;

[0161] For all lines in the first interval, the first change values ​​are combined into a first change matrix.

[0162] In one embodiment of the present invention, the second change information processing module 205 is further configured to:

[0163] After the secondary circuit of the second interval is changed, aligning the lines of the first interval with the lines of the second interval;

[0164] If the alignment is completed, taking the absolute value of the difference between the currents of the line of the first interval and the line of the second interval in the same phase as the fourth deviation value;

[0165] For the same line in the first interval and the same line in the second interval, taking the maximum value of the fourth deviation value as the second change value;

[0166] For all lines in the first interval and all lines in the second interval, forming a second change matrix with the first change values;

[0167] For the same line in the first interval and the same line in the second interval, summing the second change values ​​to obtain a third change value;

[0168] For all lines in the first interval and all lines in the second interval, the third change values ​​are combined into a third change matrix.

[0169] In one embodiment of the present invention, the change security detection module 206 includes:

[0170] a change rate calculation module, configured to calculate a change rate of current in each line of the first interval according to a difference between the first basic matrix and the first change matrix;

[0171] A current threshold query module, used to query the current threshold set for the power grid master station;

[0172] a first difference processing module, configured to construct a first difference matrix and a first threshold matrix according to the difference between the second basic matrix and the second change matrix;

[0173] A second difference processing module, configured to construct a second difference matrix and a second threshold matrix according to the difference between the third basic matrix and the third change matrix;

[0174] A safety determination module is configured to determine that the second interval change secondary circuit is safe if the change rates are all less than the current threshold, the first difference matrix is ​​less than the first threshold matrix, and the second difference matrix is ​​less than the second threshold matrix.

[0175] In one embodiment of the present invention, the change rate calculation module is further configured to:

[0176] Taking an absolute value of a difference between the first basic matrix and the first change matrix to obtain a fifth deviation value;

[0177] Taking the minimum value between the first basic matrix and the first change matrix to obtain a reference value;

[0178] The ratio between the fifth deviation value and the reference value is calculated as the change rate of the current of each line in the first interval.

[0179] In one embodiment of the present invention, the current threshold query module is further configured to:

[0180] Query the current season;

[0181] A current threshold value set for the power grid master station in the season is queried.

[0182] In one embodiment of the present invention, the first difference processing module is further configured to:

[0183] Calculating the difference between the second basic matrix and the second change matrix to obtain a first deviation matrix;

[0184] Multiplying the first deviation matrix by a preset identity matrix to obtain a first difference matrix;

[0185] The first deviation matrix is ​​multiplied by a preset first weight matrix to obtain a first threshold matrix.

[0186] In one embodiment of the present invention, the second difference processing module is further configured to:

[0187] Calculating a difference between the third basic matrix and the third change matrix as a second deviation matrix;

[0188] halving the product of the deviation matrix and the transposed matrix of the deviation matrix to obtain a second difference matrix;

[0189] The second deviation matrix is ​​multiplied by a preset second weight matrix to obtain a second threshold matrix.

[0190] The safety detection device for changing a secondary circuit provided by an embodiment of the present invention can execute the safety detection method for changing a secondary circuit provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the safety detection method for changing a secondary circuit.

[0191] Example 3

[0192] See also Figure 3 , which shows a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, blade servers, mainframe computers, and other suitable computers. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0193] like Figure 3 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0194] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0195] Processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 executes the various methods and processes described above, such as modifying the secondary circuit safety detection method.

[0196] In some embodiments, the safety detection method for changing a secondary circuit can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the safety detection method for changing a secondary circuit described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the safety detection method for changing a secondary circuit by any other appropriate means (e.g., by means of firmware).

[0197] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0198] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0199] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0200] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0201] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0202] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0203] Example 4

[0204] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the safety detection method for changing the secondary circuit provided by any embodiment of the present invention.

[0205] The computer program product may be implemented by writing computer program code for performing the operations of the present invention in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0206] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0207] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A safety detection method for changing a secondary circuit, characterized in that: include: Identifying, in the power grid master station, a first interval in which the secondary circuit is planned to be maintained unchanged and a second interval in which the secondary circuit is planned to be changed; Before the secondary circuit of the second interval is changed, a first basic matrix is ​​constructed according to the extreme value differences in current of each circuit of the first interval; Before the secondary circuit of the second interval is changed, a second basic matrix and a third basic matrix are constructed according to the extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval; After the secondary circuit of the second interval is changed, a first change matrix is ​​constructed according to the extreme value differences in current of each circuit of the first interval; After the secondary circuit of the second interval is changed, constructing a second change matrix and a third change matrix according to the extreme value differences and cumulative differences in current between each circuit of the first interval and each circuit of the second interval; Calculate the change rate of the current of each line in the first interval according to the difference between the first basic matrix and the first change matrix; querying a current threshold set for the power grid master station; constructing a first difference matrix and a first threshold matrix according to the difference between the second basic matrix and the second change matrix; constructing a second difference matrix and a second threshold matrix according to the difference between the third basic matrix and the third change matrix; If the change rates are all smaller than the current threshold, the first difference matrix is ​​smaller than the first threshold matrix, and the second difference matrix is ​​smaller than the second threshold matrix, it is determined that the second interval change secondary circuit is safe.

2. The method according to claim 1, characterized in that Before the secondary circuit of the second interval is changed, a first basic matrix is ​​constructed according to the extreme value difference in current of each circuit of the first interval, including: Before the secondary circuit of the second interval is changed, taking the absolute value of the difference between any two phase currents of the line of the first interval as the first deviation value; For the same line in the first interval, taking the maximum value of the first deviation value as the first base value; For all lines of the first interval, the first basic values ​​are combined into a first basic matrix.

3. The method according to claim 1, characterized in that Before the secondary circuit of the second interval is changed, constructing a second basic matrix and a third basic matrix based on the extreme value difference and cumulative difference in current between each circuit of the first interval and each circuit of the second interval includes: Before changing the secondary circuit of the second interval, aligning each circuit of the first interval with each circuit of the second interval; If the alignment is completed, taking the absolute value of the difference between the currents of the line of the first interval and the line of the second interval in the same phase as the second deviation value; For the same line in the first interval and the same line in the second interval, taking the maximum value of the second deviation value as the second base value; For all lines of the first interval and all lines of the second interval, forming a second basic matrix with the second basic values; For the same route in the first interval and the same route in the second interval, summing the second deviation values ​​to obtain a third base value; For all lines of the first interval and all lines of the second interval, the third basic values ​​are combined into a third basic matrix.

4. The method according to claim 2, characterized in that After the secondary circuit of the second interval is changed, a first change matrix is ​​constructed according to the extreme value differences in current of each line of the first interval, including: After the secondary circuit of the second interval is changed, taking the absolute value of the difference between any two phase currents of the line of the first interval as the third deviation value; For the same line in the first interval, taking the maximum value of the third deviation value as the first change value; For all lines in the first interval, the first change values ​​are combined into a first change matrix.

5. The method according to claim 3, characterized in that After the secondary circuit of the second interval is changed, constructing a second change matrix and a third change matrix according to the extreme value difference and cumulative difference in current between each circuit of the first interval and each circuit of the second interval, including: After the secondary circuit of the second interval is changed, aligning the lines of the first interval with the lines of the second interval; If the alignment is completed, taking the absolute value of the difference between the currents of the line of the first interval and the line of the second interval in the same phase as the fourth deviation value; For the same line in the first interval and the same line in the second interval, taking the maximum value of the fourth deviation value as the second change value; For all lines of the first interval and all lines of the second interval, forming a second change matrix with the second change values; For the same line in the first interval and the same line in the second interval, summing the second change values ​​to obtain a third change value; For all lines in the first interval and all lines in the second interval, the third change values ​​are combined into a third change matrix.

6. The method according to claim 1, wherein The calculating the change rate of the current of each line in the first interval according to the difference between the first basic matrix and the first change matrix includes: Taking an absolute value of a difference between the first basic matrix and the first change matrix to obtain a fifth deviation value; Taking the minimum value between the first basic matrix and the first change matrix to obtain a reference value; Calculating a ratio between the fifth deviation value and the reference value as a rate of change of current of each line in the first interval; The querying of the current threshold set for the power grid master station includes: Query the current season; A current threshold value set for the power grid master station in the season is queried.

7. The method according to claim 1, characterized in that The constructing a first difference matrix and a first threshold matrix according to the difference between the second basic matrix and the second change matrix includes: Calculating the difference between the second basic matrix and the second change matrix to obtain a first deviation matrix; Multiplying the first deviation matrix by a preset identity matrix to obtain a first difference matrix; Multiplying the first deviation matrix by a preset first weight matrix to obtain a first threshold matrix; The constructing a second difference matrix and a second threshold matrix according to the difference between the third basic matrix and the third change matrix includes: Calculating a difference between the third basic matrix and the third change matrix as a second deviation matrix; halving the product of the deviation matrix and the transposed matrix of the deviation matrix to obtain a second difference matrix; The second deviation matrix is ​​multiplied by a preset second weight matrix to obtain a second threshold matrix.

8. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the safety detection method for changing a secondary circuit according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for safety detection of changing a secondary circuit according to any one of claims 1 to 7 is implemented.

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