Grid-level fault data synchronous analysis method

Abstract

The invention discloses a grid-level fault data synchronous analysis method. The method comprises the following steps: configuring a homologous relationship between wave recording analog quantity channels; time deviation calculation is carried out on every two protection devices with the homologous relation in the same transformer substation; performing time deviation calculation on every two protection devices with the homologous relationship in different substations; the two protection devices with the calculated time deviation form a pairwise protection device set, and a protection device network is constructed based on the pairwise protection device set with the protection device intersection; the time of all protection devices of the protection device network is reduced to be synchronized with the reference protection device. The problem of automatic synchronization of power grid fault analysis data is solved, the power failure time is greatly shortened, and the loss caused by power failure is reduced to the greatest extent.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent substation operation and maintenance, and specifically relates to a method for synchronous analysis of power grid-level fault data. Background Art

[0002] At present, the analysis of power grid faults requires comprehensive analysis of the switch action signals and fault recording files of multiple protection devices and fault recorder devices in multiple substations. However, due to the clock system problems of each substation and the timing errors of each protection device and fault recorder device during the analysis process, there are time deviations between the protection devices and fault recorder devices in the same substation and between substations. As a result, the analog data in the switch action signals and fault recording files cannot be accurately synchronized, which in turn causes large errors in the results of the comprehensive analysis. Although synchronization can be performed at a certain zero-crossing point after the recording file channel between two protection devices is started, it only solves the synchronization problem between two protection devices in the same substation. It does not solve the synchronization of multiple devices in the same substation and the synchronization problem between devices in multiple substations. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the current prior art, the present invention provides a method for synchronous analysis of power grid-level fault data, which solves the problem of automatic and rapid positioning and analysis of power grid faults, greatly shortens power outage time, and minimizes the losses caused by power outages.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for synchronous analysis of power grid-level fault data comprises the following steps:

[0006] Step 1: Configure the homology relationship between the waveform recording analog channels;

[0007] Step 2: Time deviation calculation is performed between two protection devices with the same source relationship in the same substation;

[0008] Step 3: time deviation calculation is performed between protection devices with the same source relationship in different substations;

[0009] Step 4: The two protection devices whose time deviations are calculated form a pairwise protection device set, and a protection device network is constructed based on the pairwise protection device sets with the intersection of protection devices;

[0010] Step 5: Calculate the time of all protection devices in the protection device network to be synchronized with the reference protection device.

[0011] As described above, configuring the homologous relationship between the recording analog channels in step 1 includes establishing a corresponding relationship between the recording current channels of each branch of the bus protection with the same interval in the same substation, the recording current channels of set A protection, the recording current channels of set B protection, and the recording current channels of the acquisition unit; at the same time, it is necessary to establish a corresponding relationship between the same recording differential current channels of the protection devices of the connecting lines between the two substations.

[0012] As described above, the calculation of the time deviation between two protection devices with the same source relationship in the same substation in step 2 includes finding the starting points of the two protection devices based on the same mutation amount calculated according to the current channel that establishes a corresponding relationship between the two protection devices, and setting the first upward zero crossing point after the cycle after finding the starting point of a certain protection device as a reference, and at the same time finding the starting point of another protection device and setting the first upward zero crossing point after the cycle. The time difference between the two zero crossing points is the time deviation between the two protection devices.

[0013] As mentioned above, step 3 of calculating the time deviation between two protection devices with the same source relationship in different substations includes finding the starting points of the two protection devices according to the same mutation amount calculated by the recording difference flow channel of the protection device with corresponding relationship in the interconnection line between the two substations, and setting the first upward zero crossing point after the cycle after finding the starting point of a certain protection device as a reference, and at the same time finding the starting point of another protection device and setting the first upward zero crossing point after the cycle. The time difference between the two zero crossing points is the time deviation between the two protection devices.

[0014] The protection device network in step 4 as described above is constructed based on the following steps:

[0015] Determine whether there is a protection device in the protection device network that is the same as any protection device in the pairwise protection device set.

[0016] If not, a new protection device network is created, and the protection device sets are added to the newly created protection device network;

[0017] If only one protection device in a protection device network is the same as a protection device in a pairwise protection device set, then the protection devices in the pairwise protection device set belong to this protection device network;

[0018] If the protection devices in multiple protection device networks are the same as the protection devices in the set, the protection devices in this set belong to the protection device network obtained by merging the above multiple protection device networks.

[0019] In step 5, the time of all protection devices in the protection device network is converted to synchronization with the reference protection device, which includes the following steps:

[0020] Step 51, put the reference protection device into a queue as a head element, and the time deviation between the head element and the reference protection device is 0;

[0021] Step 52: Search the protection device network for a protection device directly associated with the team head element;

[0022] Step 53, the time deviation of the directly associated protection device is calculated based on the team head element, and the time deviation between the team head element and the reference protection device is added to obtain the time deviation between the associated protection device and the reference protection device;

[0023] Step 54: Pop out the head element and mark it as visited, and put the protection device directly associated with the head element into the queue; if there is only one protection device directly associated with the head element, it becomes the new head after being put into the queue; if there are multiple protection devices directly associated with the head element, they are all put into the queue, and the last one put into the queue is the new head element;

[0024] Step 55: If no protection device directly associated with the head element is found in the protection device network, the head element is directly popped out and marked as visited;

[0025] Step 56, repeating steps 52 to 55 until all protection devices in the protection device network are marked as visited, then according to the time deviation of all protection devices relative to the reference protection device, the time of all protection devices in the protection device network is converted to synchronization with the reference protection device.

[0026] A power grid level fault data synchronization analysis device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned power grid level fault data synchronization analysis method when executing the computer program.

[0027] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned method for synchronous analysis of grid-level fault data.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention solves the problem of automatic synchronization of power grid fault information, greatly shortens fault analysis time, and minimizes losses caused by power outages;

[0030] 2. The present invention improves the efficiency and accuracy of judging power grid accidents, reduces hidden dangers in the power system, and improves the safe operation level of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a flow chart of a method for synchronous analysis of grid-level fault data.

[0032] Figure 2 A schematic diagram of a power grid structure for a power grid-level fault data synchronization analysis method. DETAILED DESCRIPTION

[0033] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, an embodiment of the present invention provides a method for synchronous analysis of power grid-level fault data, comprising the following steps:

[0036] Step 1: Configure the homology relationship between the waveform recording analog channels;

[0037] The configuration of the homologous relationship between the recording analog channels includes establishing a corresponding relationship between the recording current channels of each branch of the bus protection with the same interval in the same substation, the recording current channels of the A set protection, the recording current channels of the B set protection, and the recording current channels of the acquisition unit; at the same time, it is necessary to establish a corresponding relationship between the same recording differential current channels of the protection devices of the connecting lines between the two substations.

[0038] Specifically, the recording channels of CT analog quantities from the same interval in the same substation are associated, including the recording current channel of the busbar protection branch corresponding to this interval, the recording current channel of the A set protection of this interval, the recording current channel of the B set protection of this interval, and the recording current channel of the acquisition unit of this interval, and the four types of channels of phase A, phase B, phase C, and phase N are associated one by one; Figure 2 Taking the interconnection line 1 interval of substation 2 as an example, it is necessary to establish a one-to-one correspondence between the four types of channels, A phase, B phase, C phase, and N, in the recording current channel of the A set line protection and the B set line protection under the interconnection line 1 interval, and the four types of channels, A phase, B phase, C phase, and N, in the recording current channel of the interconnection line 1 branch of the 220kVA set and the B set busbar protection of substation 2. At the same time, it is also necessary to establish a one-to-one correspondence between the four types of channels, A phase, B phase, C phase, and N, in the recording current channel of the interconnection line 1 in the acquisition unit; at the same time, it is necessary to establish a correspondence between the recording differential current channel of the protection device of the interconnection line 1 of substation 1 and the recording differential current channel of the protection device of the interconnection line 1 of substation 2, and associate the three types of channels, A phase, B phase, and C phase, one by one.

[0039] Step 2: Time deviation calculation is performed between two protection devices with the same source relationship in the same substation;

[0040] The calculation of the time deviation between two protection devices with a homologous relationship in the same substation includes, based on the same mutation amount calculated by the current channel that establishes a corresponding relationship between the two protection devices, finding the starting points of the two protection devices respectively, and taking a certain protection device as a reference to find the first upward zero-crossing point 0.75 cycles after the starting point of this protection device, and at the same time finding the first upward zero-crossing point 0.75 cycles after the starting point of another protection device, and the time difference between the two zero-crossing points is the time deviation between the two protection devices.

[0041] Specifically, Figure 2 Taking the interconnection line 1 interval of the substation 2 as an example, according to the correspondence between the four types of channels A, B, C, and N in the recording current channel of the A set line protection established in step 1 and the four types of channels A, B, C, and N in the recording current channel of the interconnection line 1 branch of the A set busbar protection, the following steps are performed:

[0042] Step 2.1, find the channel with the largest current in the recording channel of the protection device, such as phase A;

[0043] Step 2.2, calculate the starting points of the two protection A-phase current channels respectively through the mutation amount, such as the starting point of the line protection is QD1, and the starting point of the bus protection is QD2;

[0044] Step 2.3, starting from 0.75 cycles after the start point QD1 of the line protection, traverse each sampling point point by point. When the current point is positive and the previous point is negative, the point where the straight line connecting the two points intersects the 0 axis is the alignment point. The time T1 of the alignment point can be calculated using the principle of equal proportion;

[0045] Step 2.4: Calculate the alignment point time T2 of the busbar protection as in step 2.3, and the time deviation between the busbar protection and the line protection is T2-T1;

[0046] Step 3: time deviation calculation is performed between protection devices with the same source relationship in different substations;

[0047] The method for calculating the time deviation between two protection devices with the same source relationship in different substations includes finding the starting points of the two protection devices based on the same mutation amount calculated by the recording difference flow channel of the protection device with corresponding relationship in the interconnection line between the two substations, finding the first upward zero crossing point 0.75 cycles after the starting point of a certain protection device based on the first upward zero crossing point of the protection device, and finding the first upward zero crossing point 0.75 cycles after the starting point of another protection device. The time difference between the two zero crossing points is the time deviation between the two protection devices.

[0048] Specifically, Figure 2Taking the interconnection line 1 between substation 1 and substation 2 as an example, based on the corresponding relationship of the same recording difference current channel of the protection device of the interconnection line between the two substations in step 1, the following steps are performed:

[0049] Step 3.1, find the channel with the largest differential current among the recording differential current channels of the protection device, such as phase A;

[0050] Step 3.2, respectively calculate the starting points of the two protection A phase difference flow channels through the mutation amount, such as the starting point of the substation 1 line protection is QD1, and the starting point of the substation 2 line protection is QD2;

[0051] Step 3.3, starting from 0.75 cycles after the start point QD1 of the line protection of substation 1, traverse each sampling point backward point by point. When the current point is positive and the previous point is negative, the point where the straight line connecting the two points intersects the 0 axis is the alignment point. The time T3 of the alignment point can be calculated using the principle of equal proportion;

[0052] Step 3.4: Calculate the alignment point time T4 of the line protection of substation 2 in the same way as step 3.3, and the time deviation between the line protection of substation 1 and that of substation 2 is T4-T3;

[0053] Step 4: The two protection devices whose time deviations are calculated in the whole network form a pairwise protection device set, and the intersection of all pairwise protection device sets is calculated. If they intersect, these pairwise protection device sets form a protection device network;

[0054] Traverse the set of all the pairwise protection devices with calculated time deviations as the pairwise protection device set, and determine whether there is a protection device in the protection device network that is the same as any protection device in the pairwise protection device set.

[0055] If not, a new protection device network is created, and the protection device sets are added to the newly created protection device network;

[0056] If only one protection device in a protection device network is the same as a protection device in a pairwise protection device set, that is, one or two protection devices in a protection device network are the same as protection devices in a pairwise protection device set, then the protection devices in the pairwise protection device set belong to this protection device network;

[0057] If the protection devices in multiple protection device networks are the same as the protection devices in the set, that is, in each of the multiple protection device networks there are one or two protection devices that are the same as the protection devices in the pairwise protection device set, then the protection devices in this set belong to the protection device network after the above multiple protection device networks are merged.

[0058] The protection device collection forms a protection device network, and only the protection devices in the same protection device network can perform time deviation calculation.

[0059] Step 5, starting from a selected reference protection device in a protection device network, traverse each associated protection device one by one, and calculate the time deviation between each protection device and the reference protection device based on the time deviation between two protection devices one by one, until all protection devices in the protection device network are traversed;

[0060] The time of all protection devices in the protection device network is converted to synchronization with the reference protection device, including traversing all protection devices in the protection device network and calculating the time deviation of each protection device relative to the reference protection device, including the following steps:

[0061] Step 51, put the reference protection device into a queue as a head element, and the time deviation between the head element and the reference protection device is 0;

[0062] Step 52: Search the protection device network for a protection device directly associated with the team head element;

[0063] Step 53, the time deviation of the directly associated protection device is calculated based on the team head element, and the time deviation between the team head element and the reference protection device is added to obtain the time deviation between the associated protection device and the reference protection device;

[0064] Step 54: Pop out the head element and mark it as visited, and put the protection device directly associated with the head element into the queue; if there is only one protection device directly associated with the head element, it becomes the new head after being put into the queue; if there are multiple protection devices directly associated with the head element, they are all put into the queue, and the last one put into the queue is the new head element;

[0065] Step 55: If no protection device directly associated with the head element is found in the protection device network, the head element is directly popped out and marked as visited;

[0066] Step 56, repeat steps 52 to 55 until all protection devices in the protection device network are marked as visited, then exit the search, and the time deviations of all protection devices relative to the benchmark protection device have been calculated. Based on the time deviations of all protection devices relative to the benchmark protection device, the time of all protection devices in the protection device network is converted to be synchronized with the benchmark protection device.

[0067] Based on the time deviation between each protection device and the benchmark protection device, the time of the protection devices of the entire network is converted to be synchronized with the benchmark protection device.

[0068] In one embodiment, a grid-level fault data synchronization analysis is also provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, each step of the above-mentioned grid-level fault data synchronization analysis method is implemented.

[0069] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, each step in the above-mentioned grid-level fault data synchronization analysis method is implemented.

[0070] In one embodiment, a computer program product is provided, including a computer program, which implements the steps of the above-mentioned grid-level fault data synchronization analysis method when executed by a processor.

[0071] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods.

[0072] It should be noted that the specific embodiments described in the present invention are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A method for synchronous analysis of power grid-level fault data, characterized in that: The following steps are involved: Step 1: Configure the homology relationship between the waveform recording analog channels; Step 2: Time deviation calculation is performed between two protection devices with the same source relationship in the same substation; Step 3: time deviation calculation is performed between protection devices with the same source relationship in different substations; Step 4: The two protection devices whose time deviations are calculated form a pairwise protection device set, and a protection device network is constructed based on the pairwise protection device sets with the intersection of protection devices; Step 5: Calculate the time of all protection devices in the protection device network to be synchronized with the reference protection device.

2. A method for synchronous analysis of grid-level fault data according to claim 1, characterized in that: Configuring the homologous relationship between the recording analog channels in the step 1 includes establishing a corresponding relationship between the recording current channels of each branch of the bus protection with the same interval in the same substation, the recording current channels of the A set protection, the recording current channels of the B set protection, and the recording current channels of the acquisition unit; at the same time, it is necessary to establish a corresponding relationship between the same recording differential current channels of the protection devices of the connecting lines between the two substations.

3. A method for synchronous analysis of grid-level fault data according to claim 1, characterized in that: Calculating the time deviation between two protection devices with a homologous relationship in the same substation in step 2 includes finding the starting points of the two protection devices based on the same mutation amount calculated by the current channel that establishes a corresponding relationship between the two protection devices, and setting the first upward zero-crossing point after the cycle after finding the starting point of a certain protection device as a reference, and at the same time finding the starting point of another protection device and setting the first upward zero-crossing point after the cycle. The time difference between the two zero-crossing points is the time deviation between the two protection devices.

4. A method for synchronous analysis of grid-level fault data according to claim 1, characterized in that: The step 3 of calculating the time deviation between two protection devices with the same source relationship in different substations includes: finding the starting points of the two protection devices according to the same mutation amount calculated by the recording difference flow channel of the protection device with corresponding relationship in the interconnection line between the two substations, and setting the first upward zero crossing point after the cycle after finding the starting point of a certain protection device as a reference, and at the same time finding the starting point of another protection device and setting the first upward zero crossing point after the cycle, and the time difference between the two zero crossing points is the time deviation between the two protection devices.

5. A method for synchronous analysis of grid-level fault data according to claim 1, characterized in that: The protection device network in step 4 is constructed based on the following steps: Determine whether there is a protection device in the protection device network that is the same as any protection device in the pairwise protection device set, If not, a new protection device network is created, and the protection device sets are added to the newly created protection device network; If only one protection device in a protection device network is the same as a protection device in a pairwise protection device set, then the protection devices in the pairwise protection device set belong to this protection device network; If the protection devices in multiple protection device networks are the same as the protection devices in the set, the protection devices in this set belong to the protection device network obtained by merging the above multiple protection device networks.

6. A method for synchronous analysis of grid-level fault data according to claim 1, characterized in that: In step 5, the time of all protection devices in the protection device network is converted to synchronization with the reference protection device, which includes the following steps: Step 51, put the reference protection device into a queue as a head element, and the time deviation between the head element and the reference protection device is 0; Step 52: Search the protection device network for a protection device directly associated with the team head element; Step 53, the time deviation of the directly associated protection device is calculated based on the team head element, and the time deviation between the team head element and the reference protection device is added to obtain the time deviation between the associated protection device and the reference protection device; Step 54: Pop out the head element and mark it as visited, and put the protection device directly associated with the head element into the queue; if there is only one protection device directly associated with the head element, it becomes the new head after being put into the queue; if there are multiple protection devices directly associated with the head element, they are all put into the queue, and the last one put into the queue is the new head element; Step 55: If no protection device directly associated with the head element is found in the protection device network, the head element is directly popped out and marked as visited; Step 56, repeating steps 52 to 55 until all protection devices in the protection device network are marked as visited, then according to the time deviation of all protection devices relative to the reference protection device, the time of all protection devices in the protection device network is converted to synchronization with the reference protection device.

7. A power grid level fault data synchronization analysis device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the grid-level fault data synchronization analysis method described in any one of claims 1 to 6 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the grid-level fault data synchronization analysis method described in any one of claims 1 to 6 are implemented.

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