CN111598377A - Method and system for acquiring regional power grid reference risk on line - Google Patents
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Abstract
The invention discloses a regional power grid reference risk online acquisition method, which comprises the steps of acquiring a tide result before equipment failure; obtaining a tide result after equipment failure; calling a healing program to judge whether the DAT file is converged; comparing the current result before the equipment failure with the current result after the equipment failure to obtain a grade result converted into an accident event, so as to realize online acquisition of the power grid reference risk; meanwhile, the system comprises an acquisition module, a storage module and a processing module, wherein the acquisition module is used for acquiring a tidal current result before equipment failure and a tidal current result after the equipment failure; the calling module is used for calling the healing program for judgment; and the conversion extraction module is used for acquiring and converting the accident event grade result into a series of accident event grade results according to the accident event grade criterion, and extracting the maximum value of the accident event grade results as the final accident event grade of the risk, so that the online acquisition of the grid reference risk is realized, and the purpose of risk early warning is achieved.
Description
Technical Field
The invention relates to the technical field of power grid risk acquisition, in particular to a regional power grid benchmark risk online acquisition method and system.
Background
Along with the development of the times, people have increasingly large requirements on power resources, so that the power transmission pressure of a power grid is increased, and the important link for ensuring the sustainable transmission of power and making power grid risk early warning in advance becomes essential.
According to the current technology, the workload of a dispatcher is large, the error rate of risk manual statistics is high, and the research and the application of the online regional power grid reference risk acquisition method become very valuable for more reliably and accurately evaluating the power grid risk.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The invention is provided in view of the problems existing in the conventional manual power grid risk early warning.
Therefore, the technical problem solved by the invention is as follows: the problem of current electric wire netting risk early warning lead to dispatcher's work load big, artifical statistics risk error rate high is solved.
In order to solve the technical problems, the invention provides the following technical scheme: a regional power grid reference risk online obtaining method comprises the steps of obtaining a tide result before equipment failure; obtaining a tide result after equipment failure; calling a healing program to judge whether the trend acquisition result is converged; and comparing the current result before the equipment failure with the current result after the equipment failure to obtain a grade result converted into an accident event, so as to realize the online acquisition of the power grid reference risk.
As an optimal scheme of the method for acquiring the regional power grid reference risk on line, the method comprises the following steps: obtaining the trend result before the equipment failure comprises obtaining a voltage-loss station, a bus, a loss load and a loss user number by calling a BPA program under the condition that the spare power automatic switching is considered to be normal based on the failure condition; converting into corresponding risk accident event grades according to the power grid accident event grade criterion; extracting the maximum risk accident event grade as the final accident event grade obtained by the risk; acquiring an equipment fault set according to a reference risk acquisition condition; and calling the BPA program to obtain a trend result before the equipment fails.
As an optimal scheme of the method for acquiring the regional power grid reference risk on line, the method comprises the following steps: obtaining a power flow result after the equipment fault comprises a fault equipment set corresponding to the DAT file; and carrying out tide acquisition again.
As an optimal scheme of the method for acquiring the regional power grid reference risk on line, the method comprises the following steps: if the power flow result after the equipment failure is obtained is not converged, the net rack structure is automatically adjusted by calling the healing program until the DAT file power flow is obtained and converged, and then the power flow result after the equipment failure is obtained again.
As an optimal scheme of the method for acquiring the regional power grid reference risk on line, the method comprises the following steps: and calling the healing program to adjust the grid structure, wherein when the DAT file acquisition result is not converged, the DAT file acquisition result is converged by capturing error reporting information of the BPA program and closing a subsystem formed by spare power automatic switching or deletion of corresponding equipment.
As an optimal scheme of the method for acquiring the regional power grid reference risk on line, the method comprises the following steps: the healing program comprises load flow calculation, judging whether an unidentifiable branch is generated, if so, deleting the branch and then carrying out load flow calculation again, and if not, continuously judging whether an isolated node exists; if the isolated node exists, judging whether the bus tie spare power automatic switching exists, if so, closing the bus tie spare power automatic switching switch and then carrying out load flow calculation again, and if not, deleting the isolated node and then carrying out load flow calculation again; if no isolated node exists, judging whether an isolated subsystem exists, if yes, judging whether a bus tie spare power automatic switching device exists, if yes, closing a bus tie spare power automatic switching switch and then carrying out load flow calculation again, and if not, deleting all nodes of the whole isolated subsystem and then carrying out load flow calculation again; no isolated nodes or isolated subsystems are generated and the computation results converge.
In order to solve the technical problems, the invention also provides the following technical scheme: a regional power grid reference risk online acquisition system comprises an acquisition module, a judgment module and a judgment module, wherein the acquisition module is used for acquiring a current result before equipment failure and a current result after the equipment failure; the calling module is used for calling the healing program for judgment; and the conversion and extraction module is used for acquiring and converting the accident event grade result into a series of accident event grade results according to the accident event grade criterion, extracting the maximum value of the accident event grade results as the final accident event grade of the risk, and realizing the online acquisition of the power grid reference risk.
As an optimal scheme of the system for acquiring the regional power grid reference risk on line, the system comprises: the calling module comprises a calling unit used for realizing the calling of the healing program; and the judging unit is used for judging whether the DAT file is converged by calling the curing unit and simultaneously operating according to a set program.
As an optimal scheme of the system for acquiring the regional power grid reference risk on line, the system comprises: and the established program comprises the step of automatically adjusting the grid structure by calling the healing program if the DAT file is not converged in the flow result after the equipment failure is obtained until the DAT file is converged and then obtaining the flow result after the equipment failure again.
The invention has the beneficial effects that: the method starts from a DAT grid file, relates to three devices of a main transformer, a bus and a line, evaluates the grid annual benchmark risk, obtains the annual benchmark risk through iteration and cure, and finally adjusts the grid operation mode in a manual mode according to the risk evaluation result, so that the grid risk and loss are reduced to the lowest, and more reliable and accurate grid risk evaluation is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a flowchart of a method for acquiring a regional power grid reference risk on line according to the present invention;
FIG. 2 is a block diagram of a regional power grid benchmark risk online acquisition system provided by the invention;
FIG. 3 is an illustration of a 110kV substation;
FIG. 4 is a graph of total load information for a rack of the present invention;
FIG. 5 is a graph of line flow information for a grid of the present invention;
FIG. 6 is a graph of line overload information for a rack of the present invention;
FIG. 7 is an information diagram of convergence status of the acquisition results of the net rack of the present invention;
FIG. 8 is a BPA card information diagram (before adding points) corresponding to a certain 110kV substation;
FIG. 9 is a BPA card information diagram (after dotting) corresponding to a certain 110kV substation;
FIG. 10 is a diagram of DAT net rack file acquisition result information in the present invention;
FIG. 11 is a diagram of the present invention's acquisition application implementation results;
fig. 12 is a logic flow diagram for implementing a healing program provided in the method for acquiring the regional power grid benchmark risk online provided by the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 and fig. 12, a first embodiment of the method for obtaining the regional power grid reference risk on-line provided by the present invention is shown: a regional power grid benchmark risk online obtaining method comprises the following steps:
obtaining a tide result before equipment failure;
obtaining a tide result after equipment failure;
calling a healing program to judge whether the trend acquisition result is converged;
and comparing the current result before the equipment failure with the current result after the equipment failure to obtain the grade result converted into the accident event, thereby realizing the online acquisition of the power grid reference risk.
The obtaining of the trend result before the equipment failure specifically comprises the following steps:
based on any optional fault condition, including tripping of any section of bus, tripping of any transformer, tripping of any return alternating current line, tripping of lines with double loops and above the same tower, total loss of the highest voltage grade bus of the transformer substation, total loss of a single transformer substation, total loss of all voltage grade buses and tripping of any two main transformers with the same voltage grade of the same transformer substation, under the condition that the automatic backup power switching is considered to be normal, a voltage loss station, the bus, loss load and the number of loss users are obtained by calling a BPA (business process architecture) program;
converting into corresponding risk accident event grades according to the power grid accident event grade criterion;
extracting the maximum risk accident event grade as the final accident event grade obtained by the risk;
acquiring an equipment fault set according to a reference risk acquisition condition;
and calling a BPA program to obtain a trend result before the equipment fails.
The obtaining of the trend result after the equipment failure is specifically as follows:
returning and transporting a fault equipment set corresponding to the DAT net rack file;
and carrying out tide acquisition again.
If the DAT file acquisition result is not converged in the flow result after the equipment failure is acquired, automatically adjusting the grid structure by calling a healing program until the DAT file acquisition result is converged and then acquiring the flow result after the equipment failure again; whether the DAT file converges or not is judged according to the fact that PSD-BPA power system load flow calculation software outputs the DAT file, if the DAT file converges, a correct calculation result is output, and if the DAT file does not converge, calculation cannot be carried out, and a prompt of non-convergence is output.
Further, invoking the healing procedure to adjust the grid structure comprises: when the DAT file acquisition result is not converged, the error reporting information of the BPA program is captured, and a subsystem formed by spare power automatic switching or deletion of the corresponding equipment is closed, so that the DAT file acquisition result is converged.
Preferably, as shown in fig. 12, the implementation logic of the healing process includes:
carrying out load flow calculation after the equipment element fails, judging whether an unidentifiable branch is generated, if so, deleting the branch and then carrying out load flow calculation again, and if not, continuously judging whether an isolated node exists;
if the isolated node exists, judging whether the bus tie spare power automatic switching exists, if so, closing the bus tie spare power automatic switching switch and then carrying out load flow calculation again, and if not, deleting the isolated node and then carrying out load flow calculation again;
if no isolated node exists, judging whether an isolated subsystem exists, if yes, judging whether a bus tie spare power automatic switching device exists, if yes, closing a bus tie spare power automatic switching switch and then carrying out load flow calculation again, and if not, deleting all nodes of the whole isolated subsystem and then carrying out load flow calculation again;
and finally, no isolated node or isolated subsystem is generated, and the net rack is normal when the calculation result is converged, and the calculation result data is read.
The method comprises the following steps of comparing a tide result before equipment failure with a tide result after equipment failure to obtain a grade result converted into an accident event, wherein the online obtaining of the power grid reference risk is specifically as follows:
comparing the current result before the equipment failure with the current result after the equipment failure;
acquiring and converting the accident event grade result into a series of accident event grade results according to the power grid accident event grade criterion;
selecting the maximum value of the accident event grade result as the final accident event grade of the risk;
and the online acquisition of the grid reference risk is realized.
It should be noted that:
the BPA program refers to power system flow acquisition software, the DAT file refers to a flow acquisition net rack file, and the BPA program has the following functions: a basic power flow acquisition function, which acquires voltage, power, and the like; self-defining the output function; a load static characteristic simulation function; a generator power control function; acquiring a node P-V, P-Q, Q-V curve; analyzing the sensitivity of nodes, lines and loss; n-1 switching on and off simulation; and controlling the power of the regional tie lines, wherein the accident event grade criterion is an accident event grade evaluation standard issued by the southern power grid.
Secondly, according to the calculation result of the BPA power system load flow calculation software, the damage values such as the number of the transformer substations with the loss load, the number of the users with the loss load and the like are output, and the accident event grade is evaluated by comparing the accident event grade standard of 'investigation regulations of electric power accident events of China southern Power grid Limited liability company'.
Firstly, calculating the number of the voltage-loss transformer stations:
the main idea of calculating the number of the voltage-loss transformer stations is that B card nodes in BPA are used, if B cards exist, the bus is indicated to have voltage, otherwise, the bus is subjected to voltage loss, and if B points of the total stations, namely the buses, are failed, the station is indicated to have voltage loss. Therefore, whether the station is under the voltage can be judged by knowing whether the B cards of the station in the BPA exist or not. The system can judge whether the substation is in voltage loss in the whole substation or not through the soliton node formed by the load flow calculation result, and then the number of the voltage loss substations is counted.
And (3) uniformly calculating the loss load number:
the BPA calculation is utilized to quickly calculate the load number of a certain partition, and corresponding load information is extracted from a generated result file, namely a PFO file, only after the BPA file is operated. According to the principle, whether the load is lost or not can be obtained by only calculating twice. The first time, the calculation is carried out under the intact condition, and the total load a is obtained; the second time is that when one equipment is overhauled, namely quits running, the net rack can run normally and then is calculated to obtain the total load b; the loss load c ═ a-b can be calculated;
and then, calculating the number of the lost users:
all users are hung on a certain bus, and the reverse deduction is that only how many buses are subjected to voltage loss if the number of users needing to calculate loss is required to be known. The bus bar is represented as the B card node at BPA. The bus voltage loss is indicated as adding a note, namely bus fault, before the BPA bus, namely the B card; from this, it can be seen that as long as it is known how many B-cards are annotated under abnormal conditions, i.e. under inspection, the number of users lost can be calculated:
b is a bus node, and P is the number of users mounted on the bus node.
Finally, the accident event rating criteria shown in table 1 below were compared to assess the accident event rating.
And comparing the grade division standard of the power production safety events in the southern power grid power accident investigation regulations according to the calculated number of the voltage-loss transformer stations, the loss load number and the loss user number to obtain the accident grade.
Table 1: accident event rating criteria
According to the risk early warning method and system, the risk result obtained through simulation of seven reference risk conditions basically covers the risk condition which can occur when equipment such as a main transformer, a bus and a line in the whole grid network frame fails, and therefore the purpose of risk early warning is achieved. The accuracy of the reference risk assessment result is effectively improved, and a risk pre-control measure can be made in advance according to the reference risk assessment result, so that the purpose of reducing the operation risk of the power grid is achieved.
Example 2
Referring to fig. 3 to 11, the present invention is described in detail by taking the "total loss of a single substation, total loss of all voltage class buses" condition of a 110kV substation as shown in fig. 3 as an example, and is a second embodiment of the method for online obtaining of the regional power grid reference risk provided by the present invention:
1) as shown in fig. 4 to 7, before an equipment failure, load flow acquisition is performed on the DAT net rack file, and whether the total load, line load flow, equipment overload information, and acquisition result of the net rack converge is obtained;
2) as shown in fig. 8 to 9, the fault equipment set is clicked off, and the power flow is obtained again;
3) as shown in fig. 10, it is determined whether the DAT net rack file converges, and if not, the healing process is invoked until the DAT net rack file converges, and the above step is repeated.
When the return fault equipment set acquires the power flow again, the power flow acquisition iteration process and the relevant information data of the balance nodes can be seen at the position shown in fig. 7, and the result of the second acquisition can be known to be not converged. Continuing to observe the result file, the DAT of fig. 10 can be found to not converge and throw abnormal information, and it is found that these abnormal information do not occur when the first power flow acquisition converges, so that a comparison can be made.
The trend results do not converge, resulting in the following reasons: after all the buses of the substation are dotted, the associated main transformer and lines are also returned.
4) As shown in fig. 11, comparing the two previous and next trend results, obtaining and analyzing the accident event risk level corresponding to the current event, and taking the maximum value as the final accident event level of the current fault.
Aiming at the risk type of 'total loss of a single substation, total loss of all voltage class buses', a north mountain station 110kV1M, a north mountain station 10kV1M, a north mountain station 110kV2M and a north mountain station 10kV2M are set as fault elements. The load loss is 37.5MW (five-level event), the load loss proportion is 1.18% (six-level event), the number of the voltage loss users is 20634 households, the voltage loss station is a northern mountain station (four-level event), and the voltage loss bus is [ 110kV1M for the northern mountain station, 110kV2M for the northern mountain station, 10kV1M for the northern mountain station, 10kV1M for the northern mountain station ] (five-level event). And finally, obtaining the accident event grade according to the accident event standard: four levels of events.
Example 3
Referring to fig. 2, a first embodiment of the system for acquiring the regional power grid benchmark risk online provided by the present invention is shown: a regional power grid benchmark risk online acquisition system comprises:
the obtaining module 100 is configured to obtain a current result before the equipment failure and a current result after the equipment failure;
the calling module 200 is used for calling the healing program to judge;
the conversion and extraction module 300 is configured to obtain and convert a series accident event level result according to an accident event level criterion, and extract a maximum value of the accident event level result as a final accident event level of the risk, so as to implement online obtaining of the grid reference risk.
Further, the calling module 200 includes:
the transferring unit is used for realizing the calling of the healing program;
and the judging unit is used for judging whether the DAT file is converged by calling the healing unit and simultaneously operating according to a set program.
Wherein, the established procedure is specifically as follows: if the DAT file is not converged in the flow result after the equipment failure is obtained, the grid structure is automatically adjusted by calling a healing program until the DAT file is converged, and then the flow result after the equipment failure is obtained again.
It should be recognized that embodiments of the present invention can be realized and implemented by hardware of an acquisition machine, a combination of hardware and software, or by acquisition machine instructions stored in a non-transitory acquisition machine-readable memory. The method may be implemented in an acquisition machine program using standard programming techniques, including a non-transitory acquisition machine readable storage medium configured with the acquisition machine program, where the storage medium so configured causes the acquisition machine to operate in a specific and predefined manner, according to the method and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with an acquirer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more fetcher systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more fetcher programs, or one or more applications) that collectively execute on one or more processors, by hardware, or combinations thereof. The fetcher program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of acquisition platform operatively connected to a suitable, including but not limited to a personal computer, mini-acquisition machine, mainframe, workstation, networked or distributed acquisition environment, separate or integrated acquisition machine platform, or in communication with a charged particle tool or other imaging device, etc. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into an acquisition platform, such as a hard disk, an optical read and/or write storage medium, a RAM, a ROM, etc., such that it is readable by a programmable acquisition machine, which when read by the acquisition machine may be used to configure and operate the acquisition machine to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory harvester-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the acquisition machine itself when programmed according to the methods and techniques described herein. The harvester program can be applied to input data to perform the functions described herein to convert the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to an acquisition-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or an acquisition machine. By way of example, both an application running on an acquisition device and the acquisition device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one acquisition machine and/or distributed between two or more acquisition machines. In addition, these components can execute from various acquisition machine readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A regional power grid benchmark risk online acquisition method is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
obtaining a tide result before equipment failure;
obtaining a tide result after equipment failure;
calling a healing program to judge whether the trend acquisition result is converged;
and comparing the current result before the equipment failure with the current result after the equipment failure, and converting the current result into an accident event grade result according to accident event grade criteria to realize the online acquisition of the power grid reference risk.
2. The method for acquiring the regional power grid benchmark risk on line according to claim 1, characterized in that: obtaining the power flow result before the equipment failure comprises,
on the basis of fault conditions, under the condition that the spare power automatic switching is considered to be normal, a BPA program is called to obtain a voltage loss station, a bus, a loss load and the number of loss users;
converting into corresponding risk accident event grades according to the power grid accident event grade criterion;
extracting the maximum risk accident event grade as the final accident event grade obtained by the risk;
acquiring an equipment fault set according to a reference risk acquisition condition;
and calling the BPA program to obtain a trend result before the equipment fails.
3. The method for acquiring the regional power grid benchmark risk on line according to claim 1, characterized in that: obtaining the power flow result after the equipment failure comprises,
returning and transporting a fault equipment set corresponding to the DAT file;
and carrying out tide acquisition again.
4. The method for acquiring the regional power grid benchmark risk on line according to claim 1, characterized in that: if the power flow result after the equipment failure is obtained is not converged, the net rack structure is automatically adjusted by calling the healing program until the DAT file power flow is obtained and converged, and then the power flow result after the equipment failure is obtained again.
5. The method for acquiring the regional power grid reference risk on line according to claim 1 or 4, wherein the method comprises the following steps: invoking the healing process to adjust the grid structure includes,
and when the DAT file acquisition result is not converged, the subsystem formed by spare power automatic switching or deletion of the corresponding equipment is closed by capturing error reporting information of the BPA program, so that the DAT file acquisition result is converged.
6. The method for acquiring the regional power grid benchmark risk on line according to claim 5, wherein: the curing procedure comprises the following steps of,
carrying out load flow calculation, judging whether an unidentifiable branch is generated, if so, deleting the branch and then carrying out load flow calculation again, and if not, continuously judging whether an isolated node exists;
if the isolated node exists, judging whether the bus tie spare power automatic switching exists, if so, closing the bus tie spare power automatic switching switch and then carrying out load flow calculation again, and if not, deleting the isolated node and then carrying out load flow calculation again;
if no isolated node exists, judging whether an isolated subsystem exists, if yes, judging whether a bus tie spare power automatic switching device exists, if yes, closing a bus tie spare power automatic switching switch and then carrying out load flow calculation again, and if not, deleting all nodes of the whole isolated subsystem and then carrying out load flow calculation again;
no isolated nodes or isolated subsystems are generated and the computation results converge.
7. The utility model provides a regional electric wire netting benchmark risk obtains system on line which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the device comprises an acquisition module (100) for acquiring a power flow result before equipment failure and a power flow result after equipment failure;
the calling module (200) is used for calling the healing program to judge;
and the conversion and extraction module (300) is used for acquiring and converting the accident event grade results into a series of accident event grade results according to accident event grade criteria, extracting the maximum value of the accident event grade results as the final accident event grade of the risk, and realizing the online acquisition of the power grid reference risk.
8. The system for acquiring the regional power grid benchmark risk on line according to claim 7, characterized in that: the calling module (200) comprises,
the transferring unit is used for realizing the calling of the healing program;
and the judging unit is used for judging whether the DAT file is converged by calling the curing unit and simultaneously operating according to a set program.
9. The system for acquiring the regional power grid benchmark risk on line according to claim 8, characterized in that: and the established program comprises the step of automatically adjusting the grid structure by calling the healing program if the DAT file is not converged in the flow result after the equipment failure is obtained until the DAT file is converged and then obtaining the flow result after the equipment failure again.
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