CN109245098B - Method and device for generating fault set in power grid safety analysis and storage medium - Google Patents
Method and device for generating fault set in power grid safety analysis and storage medium Download PDFInfo
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Abstract
The invention discloses a method for generating a fault set in power grid safety analysis, which comprises the steps of firstly, acquiring first power grid data of a bus connected with each device in a power grid management system; then scanning each device, and calculating to obtain second power grid data of the bus connected after each device fails and is cut off; and finally, comparing the difference value of the first power grid data and the second power grid data, determining first target equipment with the difference value larger than a first threshold value to form a target fault set, wherein the target fault set is determined under the same standard, so that the randomness is low, a reasonable threshold value can be selected through experiments and the like, equipment with large influence on the power grid after the fault is determined, and a more accurate fault set is generated. The method can determine which devices should be listed in the fault set and which devices should not be listed in the fault set, and the generated fault set has low randomness and high accuracy. In addition, the invention also discloses a device for generating the fault set in the power grid safety analysis and a storage medium, and the effect is as above.
Description
Technical Field
The invention relates to the field of power system application, in particular to a method and a device for generating a fault set in power grid safety analysis and a storage medium.
Background
In order to improve the safety and reliability of the power grid, online safety analysis of the power grid is generally required. The online security analysis mainly comprises static security analysis and dynamic security analysis. The main means of safety analysis is to analyze and calculate the expected faults possibly occurring in the power grid by setting an expected fault set, and determine the state of the power grid in the fault occurrence process and after the fault is finished, thereby providing a basis for taking corresponding control measures. The static safety analysis mainly analyzes whether the voltage, active power, reactive power and the like exceed the operation limit value after the equipment with the fault exits the operation and the power grid enters a new operation state; the dynamic safety analysis is dynamic analysis in the accident process, and is used for evaluating the capability of the system to transition to a new stable operation state after being greatly disturbed by focusing on whether the system is in danger of losing stability and collapsing in the expected failure, and simultaneously providing necessary preventive measures and remedial schemes. With the development of alternating-current and direct-current extra-high voltage hybrid-band power grids in recent years, the risk of power grid voltage collapse possibly caused in the fault process is increased day by day, and the role of power grid online safety analysis, particularly dynamic safety analysis in power grid daily scheduling operation management is also continuously promoted. Therefore, the expected failure set is in an important position in the power grid safety analysis, and the effectiveness of the expected failure set directly influences the safety analysis effect.
Faults in the expected fault set generally include N-1 faults, N-2 faults and other faults, where an N-1 fault refers to a fault occurring in one device (e.g., a single line and a single transformer) of the power grid in the current operation mode, an N-2 fault refers to a fault occurring in two devices (mostly related devices, e.g., a double-circuit line on the same tower and 2 parallel transformers in the same station) of the power grid in the current operation mode, and other faults are faults occurring in three or more devices at the same time. In the normal operation process, the faults of N-1 and N-2 occur frequently, and the number of the faults is large, so that the faults are main analysis objects of online safety analysis. The conventional expected fault set generation mode mainly depends on a manual mode, one mode is that related personnel select certain equipment in the power grid system through experience to form a fault set, and the mode not only can leave out equipment which has a large influence on the power grid system after a fault is missed, but also can cause the problem that the fault sets selected by different personnel are inconsistent, namely the fault set has high randomness; the other method is that related personnel take all the devices in the power grid system as devices with concentrated faults to form a fault set with huge data volume, however, in the actual operation of the power grid, the operation of the whole power grid cannot be greatly affected by some device faults, so that the devices are not necessarily put into the fault set. Therefore, it cannot be determined manually which devices should be listed in the fault set and which devices should not be listed in the fault set, so that the finally formed fault set has high randomness and low accuracy.
Therefore, the problem that how to overcome the problems of large randomness and low accuracy of the fault set generated by a manual mode is a problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The embodiment of the application provides a method and a device for generating a fault set in power grid safety analysis and a storage medium, and aims to solve the problems that the fault set generated manually in the prior art is high in randomness and low in accuracy.
In order to solve the technical problem, the invention provides a method for generating a fault set in power grid safety analysis, which comprises the following steps:
acquiring first power grid data of buses connected with equipment in a power grid management system;
scanning each device and calculating second power grid data of the bus connected after each device is cut off due to faults;
and determining first target equipment with the difference value between the first power grid data and the second power grid data larger than a first threshold value to generate a target fault set.
Preferably, the scanning each of the devices and calculating the second grid data of the bus connected to the device after the device is failed and removed is specifically:
scanning each device to determine N-1 fault devices;
and calculating second power grid data of the bus connected with the N-1 fault equipment.
Preferably, the calculating the second grid data of the bus connected to the N-1 fault device specifically includes:
with the N-1 fault equipment as a starting point, searching a first bus which is associated with the N-1 fault equipment and has an electrical distance to the N-1 fault equipment smaller than a second threshold value by adopting a breadth-first search algorithm;
and calculating the power grid flow of the first bus based on a correction method, and taking the calculated power grid flow value as second power grid data of the first bus.
Preferably, the scanning each of the devices and calculating the second grid data of the bus connected to the device after the device is failed and removed is specifically:
scanning each device to determine N-2 fault devices;
and calculating second power grid data of the bus connected with the N-2 fault equipment.
Preferably, the scanning each of the devices to determine the N-2 faulty device specifically includes:
scanning a second target device on the same tower and rack line;
and taking the second target device as the N-2 fault device.
Preferably, the calculating the second grid data of the bus connected to the N-2 fault device specifically includes:
searching a second bus which is associated with the N-2 fault equipment and has an electrical distance to the N-2 fault equipment smaller than a third threshold value by using a breadth-first search algorithm with the N-2 fault equipment as a starting point;
and calculating the power grid flow of the second bus based on a correction method, and taking the calculated power grid flow value as second power grid data of the second bus.
Preferably, after determining that the first target device with the difference value between the first grid data and the second grid data larger than the first threshold value generates the target fault set, the method further includes:
judging whether the same N-2 fault equipment exists in the target fault set or not;
and if so, deleting one of the same N-2 fault devices.
In order to solve the above technical problem, the present invention further provides a device for generating a fault set in power grid security analysis, corresponding to the method for generating a fault set in power grid security analysis, including:
the acquisition module is used for acquiring first power grid data of buses connected with equipment in the power grid management system;
the scanning calculation module is used for scanning each device and calculating second power grid data of the bus connected with each device after the device fails and is cut off;
the determining module is used for determining first target equipment with a difference value between the first power grid data and the second power grid data larger than a first threshold value so as to generate a target fault set.
In order to solve the above technical problem, the present invention further provides another apparatus for generating a fault set in power grid security analysis, corresponding to the method for generating a fault set in power grid security analysis, including:
a memory for storing a computer program;
and the processor is used for executing the computer program to realize the steps of any one of the above-mentioned methods for generating the fault set in the power grid safety analysis.
In order to solve the technical problem, the present invention further provides a computer-readable storage medium corresponding to the method for generating a fault set in power grid safety analysis, where the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement any one of the steps of the method for generating a fault set in power grid safety analysis.
Compared with the prior art, the method for generating the fault set in the power grid safety analysis, provided by the invention, comprises the steps of firstly obtaining first power grid data of a bus connected with each device in a power grid management system, and obtaining the power grid data of the bus connected with each device when the devices normally operate; then scanning each device in the power grid management system, calculating to obtain second power grid data of the bus connected after each device is in fault and removed, and obtaining data of the bus connected after each device is in fault; and finally, by comparing the difference value of the first power grid data and the second power grid data, determining the first target equipment with the difference value larger than the first threshold value to form a target fault set, wherein the target fault set is determined under the same standard, so the randomness is low, a reasonable first threshold value can be selected through experiments and the like, and then the target equipment with large influence on the power grid after the fault occurs is determined, so that a more accurate target fault set is formed. Therefore, by the aid of the method, the target equipment which has a large influence on the power grid system after the fault is determined by selecting the reasonable first threshold, then the target fault set is generated, and the equipment which should be listed in the fault set and the equipment which should not be listed in the fault set can be determined. In addition, the invention also provides a device for generating the fault set in the power grid safety analysis and a storage medium, and the effect is as above.
Drawings
Fig. 1 is a flowchart of a method for generating a fault set in a power grid security analysis according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a topology of a power grid system according to an embodiment of the present invention;
fig. 3 is a schematic composition diagram of a device for generating a fault set in a power grid security analysis according to an embodiment of the present invention;
fig. 4 is a schematic composition diagram of another apparatus for generating a fault set in a power grid safety analysis according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a method and a device for generating a fault set in power grid safety analysis and a storage medium, which can solve the problems of high randomness and low accuracy of the fault set generated manually in the prior art.
In order that those skilled in the art will better understand the concept of the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Fig. 1 is a flowchart of a method for generating a fault set in a power grid safety analysis according to an embodiment of the present invention, and as shown in fig. 1, the method for generating the fault set includes:
s101: the method comprises the steps of obtaining first power grid data of buses connected with equipment in a power grid management system.
Specifically, with a predefined calculation period T, when a calculation time comes, first grid data of a bus connected to each device when the device normally operates, for example, a grid topology, parameters (data of voltage, current, power, and the like), a current grid load flow calculation result, and the like, are read from the grid management system.
S102: and scanning each device and calculating second power grid data of the bus connected after each device is cut off due to faults.
Specifically, assuming that each device in the grid management system has a fault, the fault device is removed, and the second grid data of the bus connected with the device is obtained. The second grid data may also include a grid topology structure, parameters (data such as voltage, current, and power), a current grid load flow calculation result, and the like, and in this embodiment of the present application, the second grid data mainly refers to a voltage value of a bus connected after each device is removed from a fault.
S103: and determining the first target equipment with the difference value between the first power grid data and the second power grid data larger than a first threshold value to generate a target fault set.
When the first power grid data of the bus connected when each device in the power grid management system is normal and the second power grid data of the bus connected after each device is subjected to fault removal are calculated, the difference value between the first power grid data and the second power grid data is determined, and whether the voltage difference value between the bus connected with the device and the voltage difference value before and after the device is subjected to fault removal is out of limit or not is actually compared. Then, the first target devices with the difference values larger than the first threshold are selected, so as to generate a target fault set, that is, the target fault set includes each first target device, and in this embodiment, the target fault set is a serious fault set formed by devices having a large influence on the stability of the power grid operation and the like after the devices are in fault. In actual operation, a reasonable first threshold value can be determined according to multiple times of experimental verification, and then a first target device is determined through the reasonable first threshold value, so that the influence of the faults of all devices existing in a target fault set on a power grid is ensured to be large, namely a serious fault set is determined accurately. After the critical fault set is determined, the critical fault set is output to the power grid online safety analysis software for online static and dynamic safety analysis. When the next calculation cycle comes, the process returns to step S101 to start determining the next serious fault set.
In practical application, it is only necessary to determine a serious fault set composed of N-1 fault devices and N-2 fault devices, where an N-1 fault refers to a fault occurring in one device (such as a single line and a single transformer) of a power grid in a current operation mode, an N-2 fault refers to a fault occurring in two devices (mostly related devices, such as a double-circuit line on the same tower and 2 parallel transformers operating in the same station) of the power grid in the current operation mode, and another fault refers to a fault occurring in three or more devices at the same time. In the normal operation process of the power grid, N-1 faults and N-2 faults occur frequently and are large in number, so that the N-1 fault equipment and the N-2 fault equipment are main analysis objects of online safety analysis of the power grid.
The invention provides a method for generating a fault set in power grid safety analysis, which comprises the steps of firstly, acquiring first power grid data of a bus connected with each device in a power grid management system, and obtaining the power grid data of the bus connected with each device when the devices normally operate; then scanning each device in the power grid management system, calculating to obtain second power grid data of the bus connected after each device is in fault and removed, and obtaining data of the bus connected after each device is in fault; and finally, by comparing the difference value of the first power grid data and the second power grid data, determining the first target equipment with the difference value larger than the first threshold value to form a target fault set, wherein the target fault set is determined under the same standard, so the randomness is low, a reasonable first threshold value can be selected through experiments and the like, and then the target equipment with large influence on the power grid after the fault occurs is determined, and a more accurate target fault set is generated. Therefore, by the aid of the method, the target equipment which has a large influence on the power grid system after the fault is determined by selecting the reasonable first threshold, then the target fault set is generated, and the equipment which should be listed in the fault set and the equipment which should not be listed in the fault set are determined.
In order to improve the stability of the operation of the power grid, on the basis of the above embodiment, as a preferred implementation, scanning each device and calculating second power grid data of the bus connected after each device fails and is cut off specifically includes:
scanning each device to determine N-1 fault devices;
and calculating second power grid data of the bus connected with the N-1 fault equipment.
Specifically, all devices in the power grid management system are scanned, N-1 fault devices are found, and then second power grid data of buses connected after the N-1 fault devices are in fault are calculated. In consideration of the acquisition speed of the relevant data after the fault of the N-1 fault device, as a preferred embodiment, calculating the second grid data of the bus connected with the N-1 fault device specifically includes:
searching a first bus which is associated with the N-1 fault equipment and has an electrical distance to the N-1 fault equipment smaller than a second threshold value by using an breadth-first search algorithm with the N-1 fault equipment as a starting point;
and calculating the power grid flow of the first bus based on a correction method, and taking the calculated power grid flow value as second power grid data of the first bus.
The detailed process is as follows: firstly, scanning all operation lines, main transformers and generators in a power grid management system to form an initial fault set FN1，FN1Each fault in
Containing 1 line or 1 transformer in operation.
Second step, for FN1Each of the failure devices in
Fault equipment by using breadth-first search algorithm
As a starting point, its associated bus bar (first bus bar) is searched. Setting an associated bus to a faulty device
Has an electrical distance of DkThe physical meaning is the number of ac line segments included on the shortest connection path of the bus to the device. Searching for an electrical distance from the device that is less than a second threshold DKTo form a set, denoted as: b ═ B1,B2,…,Bk}。
Thirdly, calculating the power grid load flow of the first bus by adopting a correction method, namely calculating an initial fault set FN1The calculated power grid tidal current value is used as second power grid data. Then, the voltage change of the t bus in the set is recorded as delta Vt＝|Vt-Vt"|, wherein VtIs the current value of the bus voltage, Vt' calculation for simulation after disconnection of N-1 fault equipment
The voltage value of the bus; if it is
Then the N-1 failed device will be
Joining a Severe Fault set FS(target failure set) of the target,
is a predefined voltage change threshold, i.e. a first threshold, t 1.. k.
Step four, returning to the step two, processing the initial fault set FN1Next fault device in
Up to the initial failure set FN1And all the failed devices are processed.
In order to further improve the operation stability of the grid system, on the basis of the above embodiment, as a preferred implementation manner, the scanning each device and calculating the second grid data of the bus connected after each device has a fault and is cut off specifically includes:
scanning each device to determine N-2 fault devices;
and calculating second power grid data of the bus connected with the N-2 fault equipment.
In order to quickly determine the N-2 faulty device, on the basis of the foregoing embodiment, as a preferred implementation, scanning each device to determine the N-2 faulty device specifically includes:
scanning a second target device on the same tower and rack line;
and taking the second target device as the N-2 fault device.
Specifically, all running lines in the power grid system are scanned to form an initial fault set LN2，LN2Each of the failure devices in
Comprises 2 same-pole parallel lines, and is formed by the following method:
in the first step, all the operating lines in the grid system are scanned, and for line k, the head bus B1k and the tail bus B2k are found.
In the second step, the operating lines in the grid system except k are scanned, and for line j (j | ═ k), the head bus B1j and the tail bus B2j are found.
Third, if B1k is the same as B1j or connected by a closed-loop buscouple switch and B2k is the same as B2j or connected by a closed-loop buscouple switch, a group of lines G (k, j) is formed.
Fourth, if B1k is the same as B2j or connected through a closed-loop buscouple switch, and B2k is the same as B1j or connected through a closed-loop buscouple switch, a group of lines G (k, j) is formed.
Step five, if the initial fault set LN2If the fault equipment corresponding to the line group G (k, j) is not included in the network, a new fault equipment is generated according to the line group G (k, j)
The faulty line includes lines k and j, and will
Joining initial failure set LN2。
Sixthly, returning to the first step, and processing the initial fault set LN2Until all the running line processes are completed.
In practical applications, the N-2 faulty device can be determined in other ways besides by scanning the second target device on the same tower line as the N-2 faulty device. For example, scanning all running transformers in the power grid system to form an initial fault set TN2，TN2Each of the failure devices in
The transformer comprises 2 transformers which run in parallel, and the forming method comprises the following steps:
in the first step, all running three-winding transformers in the grid system are scanned, and for transformer k, its high-side bus B1k and medium-side bus B2k are found.
In a second step, a running three-winding transformer other than k in the grid system is scanned, and for transformer j (j | ═ k), its high-side bus B1j and its medium-side bus B2j are found.
Third, if B1k is the same as B1j or connected through a closed-loop buscouple switch, and B2k is the same as B2j or connected through a closed-loop buscouple switch, a transformer group G (k, j) is formed.
Fourth, if B1k is the same as B2j or connected through a closed-loop buscouple switch, and B2k is the same as B1j or connected through a closed-loop buscouple switch, a transformer group G (k, j) is formed.
The fifth step, if TN2If the fault equipment corresponding to the transformer group G (k, j) is not included in the system, new fault equipment is generated according to the transformer group G (k, j)
The fault device includes transformers k and j, and will
Joining initial failure set TN2。
Sixthly, returning to the first step, and processing the initial fault set TN2Until all the running transformers are processed.
In order to quickly obtain relevant data after the N-2 fault device fails, on the basis of the foregoing embodiment, as a preferred implementation, calculating second grid data of a bus connected to the N-2 fault device specifically includes:
searching a second bus which is associated with the N-2 fault equipment and has an electrical distance to the N-2 fault equipment smaller than a third threshold value by using an breadth-first search algorithm with the N-2 fault equipment as a starting point;
and calculating the power grid flow of the second bus based on a correction method, and taking the calculated power grid flow value as second power grid data of the second bus.
Specifically, in the first step, a breadth-first search algorithm is adopted, and a certain device in the N-2 fault device set is taken as a starting point to search a bus (a second bus) associated with the certain device. Setting the electrical distance from the associated bus to the N-2 fault equipment to be DkThe physical meaning is the number of ac line segments included on the shortest connection path of the bus to the device. Searching for an electrical distance from the device that is less than a third threshold DKSet of busbars (second busbars) noted: b ═ B1,B2,…,Bk}. Secondly, calculating the power grid load flow of a second bus by adopting a correction method, namely calculating the power grid load flow of 2 lines or 2 main transformers contained in the initial fault set after the main transformers are disconnected, taking the calculated power grid load flow value as second power grid data, and then recording the voltage change of the t bus in the set as delta Vt＝|Vt-Vt"|, wherein VtIs the current value of the bus voltage, Vt' calculating the voltage value of the N-2 fault equipment after the equipment is switched on and switched off in a simulation way; if it is
Then the satisfactory N-2 failed devices are added to the critical failure set FS(target failure set).
Is a predefined voltage change threshold, i.e. a first threshold, t 1.. k. And thirdly, returning to the first step for processing the next fault equipment in the N-2 fault set until all fault equipment in the N-2 fault set are processed.
In order to avoid the existence of the same N-2 fault device in the target fault set, on the basis of the foregoing embodiment, as a preferred implementation, after determining the first target device whose difference between the first grid data and the second grid data is greater than the first threshold to generate the target fault set, the method further includes:
judging whether the same N-2 fault equipment exists in the target fault set or not;
if so, one of the same N-2 failed devices is deleted.
Specifically, if the same N-2 fault device exists in the target fault set, one of the same N-2 fault devices is deleted, for example, there exists an a, B N-2 fault device and another B, A N-2 fault device, and at this time, it is considered that there exist two same N-2 fault devices, i.e., one of the two same N-2 fault devices is deleted.
According to the method and the device, N-1 and N-2 fault scanning is carried out on the whole network equipment (including branch equipment) by using a breadth-first search algorithm, N-1 and N-2 fault sets are generated, the fault-associated bus set is given according to the set electrical distance of the fault-associated bus, the condition of voltage change of an adjacent bus after the fault alternating current equipment is disconnected from a power grid is calculated through simulation, and when the voltage change of the bus is larger than a specified threshold value, the fault is counted as a serious fault. The serious fault can be used for subsequent online safety analysis, so that the influence caused by the occurrence of the serious fault is avoided, and the robustness of the power grid is improved.
In order to make those skilled in the art better understand the present solution, the following detailed description of the present solution is made in combination with an actual application scenario, fig. 2 is a topological schematic diagram of a power grid system provided in an embodiment of the present invention, and as shown in fig. 2, the present invention includes 3 500kV substations, which are respectively a substation A, B, C, and include buses a0, a1, B0, B1, C0, C1, and C2 main transformers Ta1, T a2, T A3, Tb1, T B2, T C1, and T C2, lines AB1, AB2, AC1, AC2, and BC2, an electrical distance between all associated buses and a fault device is set to be equal to 1, and a voltage change threshold of all associated buses is set to be 0.1% of their own voltage. Table 1 shows the initial voltage of the bus bar, as shown in table 1.
TABLE 1
| Name of bus | A0 | A1 | B0 | B1 | C0 | C1 | C2 |
| Initial voltage/V | 526 | 233 | 525 | 232 | 524 | 231 | 231 |
Predefining a calculation period T, setting T as 30 minutes, and when the calculation time comes:
first, current grid data including grid topology, parameters, and current grid load flow calculation results are read from a grid Energy Management System (EMS).
Secondly, scanning the current power grid equipment to generate N-1 faults in a serious fault set, wherein the detailed process comprises the following steps:
firstly, scanning all running lines, main transformers and generators in a power grid model to form an initial fault set FN1，FN1Each fault in
Containing 1 line or 1 transformer in operation.
FN1＝{Ta1，Ta2，Ta3，Tb1，Tb2，Tc1，Tc2，AB1，AB2，AC1，AC2，BC2}。
Second step, for FN1The following steps are performed for each fault in (1), specifically taking the main transformer Ta1 as an example:
firstly, a breadth-first based search topology search algorithm is adopted, and a fault Ta1 containing equipment is taken as a starting point to search the associated bus. Setting the electrical distance of the associated bus to the fault Ta1 containing the equipment to 1 has the physical meaning of the number of ac line segments contained on the shortest connection path of the bus to the equipment. And searching and finding a bus set with an electrical distance from the equipment smaller than a specified threshold DK, and recording as: b ═ a0, a1, B1, C1, C2 }.
Secondly, a power grid power flow after the device included in the fault Ta1 is cut off is calculated by adopting a cut-off power flow algorithm based on a correction method, and a table 2 shows a bus power flow calculation result as shown in the table 2.
TABLE 2
| Name of bus | A0 | A1 | B0 | B1 | C0 | C1 | C2 |
| Initial voltage/V | 526 | 233 | 525 | 232 | 524 | 231 | 231 |
| Voltage threshold value/V | 0.526 | 0.233 | 0.525 | 0.232 | 0.524 | 0.231 | 0.231 |
| Cut-off Ta1/V | 525 | 232.8 | 524.8 | 231.8 | 523.9 | 230.8 | 230.8 |
| Voltage change Δ Vt | 1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.2 | 0.2 |
The voltage change Δ V of the 2 nd bus a1 is calculated sequentially from the associated bus set B ═ { a0, a1, B1, C1, C2}, anda0is 0.2, voltage change threshold
Is a value of 0.526 of the total weight,
then add N-1 fault Ta1 to critical fault set FSIs { Ta1, Ta2, Ta3, Tb1, Tb2, Tc1, AB1, AB2, AC1, AC2, BC2 }.
Repeating the previous steps to process the next fault
Up to FN1And all the failed devices are processed.
Sequentially treating
When the fault equipment is Tc2, the bus associated with Tc2 is B ═ a1, B1, C0, C1, and C2, and the disconnection table 3 shows the power flow calculation results after the Tc2 is disconnected, as shown in table 3.
TABLE 3
| Name of bus | A0 | A1 | B0 | B1 | C0 | C1 | C2 |
| Initial voltage/V | 526 | 233 | 525 | 232 | 524 | 231 | 231 |
| Voltage threshold value/V | 0.526 | 0.233 | 0.525 | 0.232 | 0.524 | 0.231 | 0.231 |
| Cut-off Tc2/V | 525.9 | 232.8 | 524.9 | 231.8 | 523.9 | 230.9 | 230.8 |
| Voltage change Δ Vt | 0.1 | 0.2 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 |
And sequentially calculating a correlation bus set B ═ A1, B1, C0, C1 and C2, wherein all voltage changes are smaller than a voltage change threshold value, and then adding the serious fault set F into the N-1 fault Tc1S. Finally obtaining a serious fault set FSIs { Ta1, Ta2, Ta3, Tb1, Tb2, AB1, AB2, AC1, AC2, BC2 }.
Thirdly, scanning the current power grid equipment to generate N-2 faults in a serious fault set, wherein the detailed process comprises the following steps:
firstly, scanning all running lines in a power grid system to form an initial fault set LN2，LN2Each fault in
Comprises 2 same-pole parallel lines, and is formed by the following method:
first, all the lines in the grid model that are in operation are scanned, and for line AB1, its head bus a1 and tail bus B1 are found.
Next, the operating lines in the grid model except AB1 are scanned, and for a line (not AB1), its head bus and tail bus are found, and the head and tail buses of each line in table 4 are shown in table 4.
TABLE 4
| Line name | AB2 | AC1 | AC2 | BC2 |
| Head end bus | A1 | A1 | A1 | B1 |
| Terminal bus | B1 | C1 | C2 | C2 |
Again, the leading bus of AB2 and AB1 are the same (a1) and the trailing bus is the same (B1), forming group G (AB1, AB 2).
Finally, LN2If the fault corresponding to the line group G (AB1, AB2) is not included, a new line group G (k, j) is generatedFault of
The fault includes lines k and j, and will
Join set LN2。
And repeating the steps to process the next line until all the running lines are processed. Finally obtain LN2Is { G (AB1, AB2), G (AC1, AC2) }.
Secondly, scanning all running transformers in the power grid system to form an initial fault set TN2，TN2Each fault in
The transformer comprises 2 transformers which run in parallel, and the forming method comprises the following steps:
first, all running three-winding transformers in the grid model are scanned, and for transformer Ta1, its high-side bus a0 and medium-side bus a1 are found.
Next, the three-winding transformer operating except Ta1 in the grid model is scanned, the high-voltage side bus and the medium-voltage side bus of the transformer are found out if the transformer is not Ta1, and the high-voltage side bus and the medium-voltage side bus corresponding to each transformer in table 5 are shown in table 5.
TABLE 5
| Name of transformer | Ta2 | Ta3 | Tb1 | Tb2 | Tc1 | Tc2 |
| High-voltage side bus | A0 | A0 | B0 | B0 | C0 | C0 |
| Medium-voltage side bus | A1 | A1 | B1 | B1 | C1 | C2 |
Thirdly, if the high-voltage side bus of Ta2 and Ta1 is the same (A0) and the medium-voltage side bus is the same (A1), a line group G is formed (Ta1, Ta 2); if the high-voltage side bus of Ta3 is the same as that of Ta1 (a0) and the medium-voltage side bus is the same as that of Ta1 (a1), a line group G is formed (Ta1, Ta 3).
Finally, TN2If the fault corresponding to the transformer group G (Ta1, Ta2) is not included, a new fault is generated according to the transformer group G (Ta1, Ta2)
The fault includes transformers Ta1 and Ta2, and will be
Joining set TN2；TN2If the fault corresponding to the transformer group G (Ta1, Ta3) is not included in the transformer group, the fault is detected according to the transformationGroup G (Ta1, Ta3) generates a new fault
The fault includes transformers Ta1 and Ta3, and will be
Joining set TN2。
And repeatedly executing the steps to process the next transformer until all the running transformers are processed. Finally, a set T is obtainedN2Is { G (Ta1, Ta2), G (Ta1, Ta3), G (Ta2, Ta3), G (Tb1, Tb2) }; since the transformers Tc1 and Tc2 are operated in split mode, they are not added to the set TN2In (1).
Third, F is executedN2＝LN2∪TN2Forming an initial N-2 fault set FN2，FN2Is { G (AB1, AB2), G (AC1, AC2), G (Ta1, Ta2), G (Ta1, Ta3), G (Ta2, Ta3), G (Tb1, Tb2) }; and to FN2Each fault in
Executing: firstly, a search topology search algorithm based on breadth-first is adopted to detect faults
The device included in (1) is a starting point, and its associated bus bar is searched. The electrical distance of the associated bus to the faulty device is set to 1, which has the physical meaning of the number of ac line sections contained on the shortest connection path of the bus to the device. And searching and finding a bus set with an electrical distance from the equipment smaller than a specified threshold value 1, and recording as: b ═ a0, a1, B0, B1, C1, C2} next, fault is calculated by using open-flow algorithm based on correction method
The power grid flow after the disconnection of 2 lines AB1 and AB2 included in table 6 is the power grid flow after the disconnection of lines AB1 and AB2, as shown in table 6.
TABLE 6
| Name of bus | A0 | A1 | B0 | B1 | C0 | C1 | C2 |
| Initial voltage/V | 526 | 233 | 525 | 232 | 524 | 231 | 231 |
| Voltage threshold value/V | 0.526 | 0.233 | 0.525 | 0.232 | 0.524 | 0.231 | 0.231 |
| Break AB1, AB2 | 524.8 | 232.4 | 524.2 | 231.3 | 523.8 | 230.6 | 230.6 |
| Voltage change Δ Vt | 1.2 | 0.6 | 0.8 | 0.7 | 0.2 | 0.4 | 0.4 |
And sequentially calculating the voltage change delta V of the 1 st bus A0, namely the associated bus set B { A0, A1, B0, B1, C1 and C2}, whereina0Is 1.2, threshold value of voltage change
Is a value of 0.526 of the total weight,
then the N-2 fault G (AB1, AB2) is added to the critical fault set FS。
Repeatedly executing the above steps to process the next fault equipment
Up to FN2All fault handling is complete. Finally obtaining a serious fault set FSIs { Ta1, Ta2, Ta3, Tb1, Tb2, Tc1, AB1, AB2, AC1, AC2, BC2, G (AB1, AB2), G (AC1, AC2), G (Ta1, Ta2), G (Ta1, Ta3), G (Ta2,Ta3)，G(Tb1，Tb2)}。
the critical failure set F to be formedSAnd outputting the data to power grid online safety analysis software for online static and dynamic safety analysis. When the next calculation cycle comes, the next round of calculation of the serious fault set is started.
The above embodiment of the method for generating the fault set in the power grid safety analysis is described in detail, and based on the method for generating the fault set in the power grid safety analysis described in the above embodiment, the embodiment of the present invention further provides a device for generating the fault set in the power grid safety analysis corresponding to the method. Since the embodiment of the apparatus portion and the embodiment of the method portion correspond to each other, the embodiment of the apparatus portion is described with reference to the embodiment of the method portion, and is not described again here.
Fig. 3 is a schematic diagram illustrating a fault set generation apparatus in a power grid security analysis according to an embodiment of the present invention, and as shown in fig. 3, the fault set generation apparatus includes an obtaining module 301, a scanning calculation module 302, and a determination module 303.
An obtaining module 301, configured to obtain first power grid data of a bus connected to each device in a power grid management system;
the scanning calculation module 302 is configured to scan each device and calculate second grid data of a bus connected to each device after each device fails and is removed;
a determining module 303, configured to determine a first target device for which a difference between the first grid data and the second grid data is greater than a first threshold, so as to generate a target fault set.
The invention provides a device for generating a fault set in power grid safety analysis, which comprises the steps of firstly, acquiring first power grid data of a bus connected with each device in a power grid management system, and obtaining the power grid data of the bus connected with each device when the devices normally operate; then scanning each device in the power grid management system, calculating to obtain second power grid data of the bus connected after each device is in fault and removed, and obtaining data of the bus connected after each device is in fault; and finally, by comparing the difference value of the first power grid data and the second power grid data, determining the first target equipment with the difference value larger than the first threshold value to form a target fault set, wherein the target fault set is determined under the same standard, so the randomness is low, a reasonable first threshold value can be selected through experiments and the like, and then the target equipment with large influence on the power grid after the fault occurs is determined, so that a more accurate target fault set is formed. Therefore, by the aid of the generation device, the target equipment which has a large influence on the power grid system after the fault is determined by selecting the reasonable first threshold, then the target fault set is generated, and the equipment which should be listed in the fault set and the equipment which should not be listed in the fault set are determined.
The above embodiment of the method for generating the fault set in the power grid safety analysis is described in detail, and based on the method for generating the fault set in the power grid safety analysis described in the above embodiment, the embodiment of the present invention further provides another device for generating the fault set in the power grid safety analysis, which corresponds to the method. Since the embodiment of the apparatus portion and the embodiment of the method portion correspond to each other, the embodiment of the apparatus portion is described with reference to the embodiment of the method portion, and is not described again here.
Fig. 4 is a schematic composition diagram of another fault set generation apparatus in grid safety analysis according to an embodiment of the present invention, and as shown in fig. 4, the fault set generation apparatus includes a memory 401 and a processor 402.
A memory 401 for storing a computer program;
a processor 402 for executing a computer program to implement the steps of the method for generating a fault set in a grid security analysis provided by any of the above embodiments.
According to the other generation device for the fault set in the power grid safety analysis, which is provided by the invention, the target equipment which has a larger influence on the power grid system after the fault is determined by selecting the reasonable first threshold, then the target fault set is generated, and the target equipment which is listed in the fault set and the target equipment which is not listed in the fault set are determined.
The above embodiment of the method for generating a fault set in power grid safety analysis is described in detail, and based on the method for generating a fault set in power grid safety analysis described in the above embodiment, the embodiment of the present invention further provides a computer readable storage medium corresponding to the method. Since the embodiment of the computer-readable storage medium portion and the embodiment of the method portion correspond to each other, please refer to the embodiment of the method portion for describing the embodiment of the computer-readable storage medium portion, which is not described herein again.
A computer readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the steps of the method for generating a fault set in a grid safety analysis provided in any one of the above embodiments.
In the computer-readable storage medium provided by the invention, the processor can read a program stored in the readable storage medium, so that the method for generating the fault set in the power grid safety analysis provided by any one of the embodiments can be realized, the target device which has a large influence on the power grid system after the fault is determined by selecting the reasonable first threshold, then the target fault set is generated, and the devices which should be listed in the fault set and the devices which should not be listed in the fault set are determined.
The method, the device and the storage medium for generating the fault set in the power grid safety analysis provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using several examples, the above description of which is only intended to facilitate the understanding of the method and its core concepts of the present invention; meanwhile, for those skilled in the art, based on the idea of the present invention, there may be variations in the specific embodiments and applications, and in summary, the present disclosure should not be construed as a limitation of the present invention, and those skilled in the art should include modifications, equivalent substitutions, improvements and the like without inventive labor.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the term "comprises/comprising" and the like, such that a unit, device or system comprising a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such unit, device or system.
Claims (8)
1. A method for generating a fault set in power grid safety analysis is characterized by comprising the following steps:
acquiring first power grid data of buses connected with equipment in a power grid management system;
scanning each device and calculating second power grid data of the bus connected after each device is cut off due to faults;
determining first target equipment with a difference value between the first power grid data and the second power grid data larger than a first threshold value to generate a target fault set;
the scanning of each piece of equipment and the calculation of the second grid data of the bus connected with each piece of equipment after the equipment fails and is cut off are specifically as follows:
scanning each device to determine N-1 fault devices;
calculating second power grid data of a bus connected with the N-1 fault equipment;
wherein the calculating second grid data of the bus connected with the N-1 fault device specifically includes:
with the N-1 fault equipment as a starting point, searching a first bus which is associated with the N-1 fault equipment and has an electrical distance to the N-1 fault equipment smaller than a second threshold value by adopting a breadth-first search algorithm;
and calculating the power grid flow of the first bus based on a correction method, and taking the calculated power grid flow value as second power grid data of the first bus.
2. The method for generating a fault set in grid safety analysis according to claim 1, wherein the scanning of each of the devices and the calculation of the second grid data of the bus connected after each of the devices has a fault and is removed specifically includes:
scanning each device to determine N-2 fault devices;
and calculating second power grid data of the bus connected with the N-2 fault equipment.
3. The method for generating the fault set in the power grid safety analysis according to claim 2, wherein the scanning of each device to determine the N-2 fault device specifically comprises:
scanning a second target device on the same tower and rack line;
and taking the second target device as the N-2 fault device.
4. The method for generating a fault set in grid safety analysis according to claim 3, wherein the calculating second grid data of the bus connected to the N-2 fault device specifically includes:
searching a second bus which is associated with the N-2 fault equipment and has an electrical distance to the N-2 fault equipment smaller than a third threshold value by using a breadth-first search algorithm with the N-2 fault equipment as a starting point;
and calculating the power grid flow of the second bus based on a correction method, and taking the calculated power grid flow value as second power grid data of the second bus.
5. The method for generating a fault set in grid safety analysis according to claim 3, wherein after determining that the first target device with the difference value between the first grid data and the second grid data larger than the first threshold value generates the target fault set, the method further comprises:
judging whether the same N-2 fault equipment exists in the target fault set or not;
and if so, deleting one of the same N-2 fault devices.
6. An apparatus for generating a fault set in a grid safety analysis, comprising:
the acquisition module is used for acquiring first power grid data of buses connected with equipment in the power grid management system;
the scanning calculation module is used for scanning each device and calculating second power grid data of the bus connected with each device after the device fails and is cut off;
the determining module is used for determining first target equipment with a difference value between the first power grid data and the second power grid data larger than a first threshold value so as to generate a target fault set;
the scanning of each piece of equipment and the calculation of the second grid data of the bus connected with each piece of equipment after the equipment fails and is cut off are specifically as follows:
scanning each device to determine N-1 fault devices;
calculating second power grid data of a bus connected with the N-1 fault equipment;
wherein the calculating second grid data of the bus connected with the N-1 fault device specifically includes:
with the N-1 fault equipment as a starting point, searching a first bus which is associated with the N-1 fault equipment and has an electrical distance to the N-1 fault equipment smaller than a second threshold value by adopting a breadth-first search algorithm; and calculating the power grid flow of the first bus based on a correction method, and taking the calculated power grid flow value as second power grid data of the first bus.
7. An apparatus for generating a fault set in a grid safety analysis, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the method for generating a fault set in a grid safety analysis according to any one of claims 1 to 5.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program, which is executed by a processor to implement the steps of the method for generating a fault set in a grid safety analysis according to any one of claims 1 to 5.
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| JPH07194010A (en) * | 1993-12-28 | 1995-07-28 | Mitsubishi Electric Corp | Ac/dc converter controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07194010A (en) * | 1993-12-28 | 1995-07-28 | Mitsubishi Electric Corp | Ac/dc converter controller |
| CN106327034A (en) * | 2015-06-18 | 2017-01-11 | 中国电力科学研究院 | Cascading failure search and weak link analysis method based on operation reliability model |
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