CN110930015A - Method and system for preventing large-scale power distribution network accidents - Google Patents
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Abstract
The application relates to a method and a system for preventing accidents of a large power distribution network. The method for preventing the accident of the large-scale power distribution network comprises the following steps: collecting abnormal alarm signals in a main power network and a power distribution network; judging an abnormal alarm event according to the abnormal alarm signal; carrying out risk evaluation on the abnormal alarm event; and generating an accident emergency treatment plan according to the risk evaluation result of the abnormal alarm event. The accident emergency treatment plan can be provided in time before an abnormal accident occurs, and further the abnormal accident can be effectively prevented. And the collected abnormal alarm signals comprise the abnormal alarm signals of the target power distribution network and the abnormal alarm signals of all main power networks related to the target power distribution network. Therefore, the accident emergency treatment plan generated by the target power distribution network can fully consider the conditions of all the main power grids, and the accident can be prevented more accurately.
Description
Technical Field
The application relates to the technical field of power grids, in particular to a method and a system for preventing accidents of a large-scale power distribution network.
Background
In an urban power distribution network, once a large-scale fault occurs, a plurality of power supply lines stop working, and large-area urban loads lose power supply. This will bring a lot of inconvenience for resident's life, and can cause huge economic loss for mill, enterprise.
Meanwhile, due to the congenital defects of multiple points and wide points of the distribution network (radial networks, nonstandard equipment models, insufficient automation information, unbalanced resource distribution and the like), the urban distribution network faces a severe test in the aspect of large-scale fault response processing.
Therefore, how to prevent accidents of the large-scale power distribution network, reduce the harm to the urban power distribution network and improve the power supply reliability of users is a problem to be solved urgently in the field.
Disclosure of Invention
In view of the above, it is necessary to provide a method and a system for preventing accidents in large power distribution networks.
A method for preventing accidents of a large power distribution network is characterized by comprising the following steps:
collecting abnormal alarm signals in a main power network and a power distribution network;
judging an abnormal alarm event according to the abnormal alarm signal;
carrying out risk evaluation on the abnormal alarm event;
and generating an accident emergency treatment plan according to the risk evaluation result of the abnormal alarm event.
In one embodiment, the risk assessment of the abnormal alarm event comprises:
performing risk assessment on each user related to the abnormal alarm event;
and carrying out risk assessment on the power distribution network.
In one of the embodiments, the first and second electrodes are,
performing risk assessment on each user associated with the abnormal alarm event comprises: performing risk assessment on the user power failure probability risk value, the user power failure duration risk value and the user electric quantity loss risk value of each user related to the abnormal alarm event;
the risk assessment of the power distribution network comprises the following steps: and accumulating the user power failure time length risk values and the user electric quantity loss risk values of all the users related to the abnormal alarm event to obtain the power distribution network power failure time length risk value and the power distribution network electric quantity loss risk value of the whole power distribution network.
In one embodiment, the performing risk assessment on each user associated with the abnormal alarm event further comprises:
and evaluating the user risk level of each user related to the abnormal alarm event according to the user power failure probability risk value, the user power failure duration risk value and the user electric quantity loss risk value of each user related to the abnormal alarm event.
In one embodiment, the performing risk assessment on each user associated with the abnormal alarm event further comprises:
and evaluating the importance level of each user related to the abnormal alarm event.
In one embodiment, the evaluation of the importance level of each user associated with the abnormal alarm event comprises: and evaluating the importance level of each user related to the abnormal alarm event according to the electricity utilization load.
In one embodiment, the performing, according to the user outage probability risk value, the user outage duration risk value, and the user power loss risk value of each user related to the abnormal alarm event, the user risk level assessment on each user related to the abnormal alarm event includes:
setting safety thresholds of a user power failure probability risk value, a user power failure duration risk value and a user electric quantity loss risk value corresponding to the importance level according to the importance level of each user related to the abnormal alarm event;
and evaluating the user risk level of each user related to the abnormal alarm event according to the user power failure probability risk value, the user power failure duration risk value and the safety threshold of the user electric quantity loss risk value.
In one embodiment, the step of setting the user with the importance level higher than the preset level as an important user, and the step of generating an accident emergency treatment plan according to the risk assessment result of the abnormal alarm event comprises the following steps:
and when the user risk level of the important user is greater than a preset level, generating a plurality of accident handling transfer plans for the important user.
In one embodiment, the plurality of accident handling offers generated for the important user include:
and sequencing the multiple accident emergency treatment plans according to the electricity utilization load, the number of operation switches and the load balancing degree.
A system for preventing accidents in a large power distribution network, comprising:
the abnormal alarm signal collection module is used for collecting abnormal alarm signals in the main power network and the power distribution network;
the abnormal alarm event judging module is used for judging an abnormal alarm event according to the abnormal alarm signal and the expert alarm rule base;
the risk evaluation module is used for carrying out risk evaluation on the abnormal alarm event;
and the plan generating module is used for generating an accident emergency treatment plan according to the risk evaluation result of the abnormal alarm event.
The method for preventing the accidents of the large power distribution network can provide the accident emergency treatment plan in time before the abnormal accidents occur, and further can effectively prevent the abnormal accidents. And the collected abnormal alarm signals comprise the abnormal alarm signals of the target power distribution network and the abnormal alarm signals of all main power networks related to the target power distribution network. Therefore, the accident emergency treatment plan generated by the target power distribution network can fully consider the conditions of all the main power grids, and the accident can be prevented more accurately. .
Drawings
FIG. 1 is a flow chart of a method for preventing accidents in a large power distribution network according to one embodiment;
FIG. 2 is a diagram illustrating a merging method of abnormal alarm signals according to an embodiment;
fig. 3 is a schematic diagram of a system for preventing accidents in a large power distribution network according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, referring to fig. 1, there is provided a method for preventing accidents in a large power distribution network, comprising the steps of:
and step S1, collecting abnormal alarm signals in the main power grid and the power distribution network.
In a power grid system, a substation is located in a main power grid and a consumer is located in a power distribution grid. The voltage in the main grid (e.g. 500kV, 220kV, 110kV) is typically higher in class, whereas the voltage in the distribution grid (e.g. 10kV) is typically lower in class. According to the embodiment of the application, all types of abnormal alarm signal information of all main power networks related to the target power distribution network and all types of primary and secondary equipment of all voltage levels in the power distribution network are collected, and the collected signal content is improved.
Before an abnormal accident occurs, the voltage, the current, the active power flow, the reactive power flow and the like of fault equipment are changed rapidly. The sudden change of the electrical quantity monitored by various protection devices can generate a large number of abnormal alarm signals. And multiple abnormal alarm signals may accompany a single abnormal event before it occurs. The abnormal alarm signals are respectively uploaded to the scheduling master station in an independent mode according to the occurrence time and the area, and then the collection of the abnormal alarm signals is realized.
It is to be understood that the "abnormal alarm signal" herein is a signal generated before the occurrence of an abnormal event, which is different from the "abnormal fault signal" generated after the occurrence of an abnormal event.
And step S2, judging an abnormal alarm event according to the abnormal alarm signal.
Before this, an expert alarm rules base may be established. When the expert alarm rule base is established, the typical mode of urban power distribution network wiring is taken as the background, comprehensive judgment is carried out by combining a network topology structure and an experience knowledge base, abnormal alarm signals are classified and summarized, and the internal relation between discrete alarm events and the abnormal alarm signals is provided.
In the step, various discrete alarm events can be deduced according to the collected abnormal alarm signals and the expert alarm rule base through the alarm merging analysis engine, and then all the discrete alarm events related to the collected abnormal alarm signals are merged, so that the abnormal alarm events are extracted and judged, and the reason for generating the abnormal alarm signals is found out.
That is, the merging method may infer an abnormal alarm event through a causal relationship provided by the alarm merging analysis engine and the expert alarm rule base, and find out a cause of generating an abnormal alarm signal.
As shown in fig. 2, after all the collected abnormal alarm signals are merged to refine and determine the abnormal alarm event, the internal relationship between the abnormal alarm event and the abnormal alarm signal may also be established. The internal relation is used as experience and input into an experience knowledge base to be combined with a network topology structure to further optimize and enrich an expert alarm rule base to form a progressive closed loop. Therefore, when a large number of abnormal alarm signals occur, the abnormal alarm event associated with the abnormal alarm signal can be quickly analyzed according to the internal relation between the abnormal alarm signal and the abnormal alarm event, and the reason for generating the abnormal alarm signal can be quickly found out.
And step S3, performing risk assessment on the abnormal alarm event.
After the abnormal alarm event is judged, and the reason for generating the abnormal alarm signal is found out, the risk evaluation of relevant indexes can be carried out on all power failure accidents possibly caused by the abnormal alarm event.
And step S4, generating an accident emergency treatment plan according to the risk evaluation result of the abnormal alarm event.
After the risk evaluation is carried out on the abnormal alarm event, an accident emergency treatment plan is automatically generated according to the risk evaluation result of the abnormal alarm event, so that the scheduling personnel and the monitoring personnel can be helped to analyze, position and treat various abnormal alarm signals, the analysis and problem treatment capacity of the scheduling personnel for dealing with various complex conditions is improved, and the scheduling personnel is assisted to make the most suitable scheduling decision.
The embodiment can provide an accident emergency treatment plan in time before an abnormal accident occurs, so that the abnormal accident can be effectively prevented. And the collected abnormal alarm signals comprise the abnormal alarm signals of the target power distribution network and the abnormal alarm signals of all main power networks related to the target power distribution network. Therefore, the accident emergency treatment plan generated by the target power distribution network can fully consider the conditions of all the main power grids, and the accident can be prevented more accurately.
In one embodiment, step S3 (risk assessment of abnormal alarm event) includes:
and step S31, performing risk assessment on each user related to the abnormal alarm event.
And step S32, carrying out risk assessment on the power distribution network.
And risk assessment is carried out from two angles of the power distribution network and the user, so that the influence of the abnormal alarm event on the power distribution network can be comprehensively reflected.
Specifically, step S31 (performing risk assessment on users related to the abnormal alarm event) may include step S311: and evaluating the user power failure probability risk value, the user power failure duration risk value and the user electric quantity loss risk value of each user related to the abnormal alarm event, namely obtaining the user power failure probability risk value, the user power failure duration risk value and the user electric quantity loss risk value of each user related to the abnormal alarm event.
Step S32 (risk assessment of the distribution network) may include: and accumulating the user power failure time length risk values and the user electric quantity loss risk values of all the users related to the abnormal alarm event to obtain the power distribution network power failure time length risk value and the power distribution network electric quantity loss risk value of the whole power distribution network.
Further, step S31 (performing risk assessment on each user related to the abnormal alarm event) may further include step S312: and evaluating the user risk level of each user related to the abnormal alarm event according to the user power failure probability risk value, the user power failure duration risk value and the user electric quantity loss risk value of each user related to the abnormal alarm event.
Meanwhile, step S31 (performing risk assessment on each user related to the abnormal alarm event) may further include step S313: and evaluating the importance level of each user related to the abnormal alarm event. Specifically, the evaluation of the importance level of each user related to the abnormal alarm event may include: and evaluating the importance level of each user related to the abnormal alarm event according to the electricity utilization load. The national standard defines the load grade of the power consumption, and the users can be divided into primary users, secondary users and tertiary users according to the power consumption load.
Step S313 may precede step S312. At this time, step S312 (performing user risk level evaluation on each user related to the abnormal alarm event according to the user outage probability risk value, the user outage duration risk value, and the user power loss risk value of each user related to the abnormal alarm event) may include:
and S3121, setting a user power failure probability risk value, a user power failure duration risk value and a user electric quantity loss risk value safety threshold value corresponding to the importance level according to the importance level of each user related to the abnormal alarm event.
Here, the "safety threshold" refers to a safety upper limit value that a user can bear a certain kind of risk influence, and the value is adjusted by referring to historical data and combining with the actual situation and the requirement of the user.
And S3122, evaluating the user risk grade of each user related to the abnormal alarm event according to the user power failure probability risk value, the user power failure duration risk value and the safety threshold of the user electric quantity loss risk value.
The user risk levels can be divided into four levels specifically, the criterion can be that ① user 3-class risk values (a user power failure probability risk value, a user power failure time length risk value and a user electric quantity loss risk value) are all in a safety range to indicate that a user is in a safe operation state, ② the user is considered to be in a warning state if 1-class risk value exceeds a safety threshold, ③ the user is considered to be in an emergency state if 2-class risk values exceed the safety threshold, and ④ the user is considered to be in a dangerous state if 3-class risk values exceed the safety threshold.
With equal risk values, the loss for users with higher importance levels may be far greater. Thus, users with higher importance levels have higher power supply reliability requirements and therefore require lower risk safety thresholds for such users.
Of course, the present application does not limit the sequence between step S312 and step S313 to the above sequence.
In one embodiment, the user with the importance level higher than the preset level is set as an important user, and the step S4 (generating an accident emergency treatment plan according to the risk assessment result of the abnormal alarm event) includes:
and step S41, when the user risk level of the important user is greater than a preset level, generating a plurality of accident handling transfer plans for the important user.
The preset level may indicate a level at which the user's importance level is sufficiently high. The preset level means a level where the user risk level is large and the power outage risk is large. At this time, generating a plurality of accident handling transfer plans for the important users can assist the dispatcher to select a preferred plan and a standby plan.
The multiple accident handling transfer plans can be obtained by calculation through carrying out topology analysis and network reconstruction on the power distribution network through an algorithm. And finally, the dispatching personnel confirms the multiple accident handling plan and selects the preferred scheme and the standby scheme.
The algorithm comprises the following specific steps:
(a) the system carries out topology analysis by taking a power-loss bus as a starting point, firstly, all power-loss circuits are obtained, a first operable distribution network switch at the downstream of a power-loss circuit outgoing line switch is obtained through topology analysis, the operation state of a plan of the switch is assigned, and safety isolation is achieved;
(b) firstly, dividing power-off lines into a plurality of connected areas according to the connected areas;
(c) the system respectively calculates a recoverable power supply scheme of each power loss line;
(d) and (3) carrying out combined analysis on the power restoration schemes of a plurality of lines in each communication area (an area which is in mutual communication relation with each other), thereby obtaining a plurality of accident handling and supply transfer plans.
And sequencing the multiple accident emergency treatment plans according to the electricity utilization load, the number of operation switches and the load balancing degree. The sequencing sequence may be automatically stored for confirmation by the scheduling personnel and selection of the preferred and alternate schedules.
In one embodiment, referring to fig. 3, a system for preventing accidents in a large power distribution network is further provided, which includes an abnormal alarm signal collecting module 100, an abnormal alarm event determining module 200, a risk evaluating module 300, and a plan generating module 400.
The abnormal alarm signal collecting module 100 is configured to collect abnormal alarm signals in a main power grid and a power distribution network. The abnormal alarm event determination module 200 is used for determining an abnormal alarm event according to the abnormal alarm signal and the expert alarm rule base. The risk assessment module 300 is used for performing risk assessment on the abnormal alarm event. The plan generating module 400 is configured to generate an accident emergency treatment plan according to the risk assessment result of the abnormal alarm event.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for preventing accidents of a large power distribution network is characterized by comprising the following steps:
collecting abnormal alarm signals in a main power network and a power distribution network;
judging an abnormal alarm event according to the abnormal alarm signal;
carrying out risk evaluation on the abnormal alarm event;
and generating an accident emergency treatment plan according to the risk evaluation result of the abnormal alarm event.
2. The method of claim 1, wherein performing a risk assessment of an abnormal alarm event comprises:
performing risk assessment on each user related to the abnormal alarm event;
and carrying out risk assessment on the power distribution network.
3. The method of claim 2,
performing risk assessment on each user associated with the abnormal alarm event comprises: performing risk assessment on the user power failure probability risk value, the user power failure duration risk value and the user electric quantity loss risk value of each user related to the abnormal alarm event;
the risk assessment of the power distribution network comprises the following steps: and accumulating the user power failure time length risk values and the user electric quantity loss risk values of all the users related to the abnormal alarm event to obtain the power distribution network power failure time length risk value and the power distribution network electric quantity loss risk value of the whole power distribution network.
4. The method of claim 3, wherein performing a risk assessment for each user associated with the abnormal alarm event further comprises:
and evaluating the user risk level of each user related to the abnormal alarm event according to the user power failure probability risk value, the user power failure duration risk value and the user electric quantity loss risk value of each user related to the abnormal alarm event.
5. The method of claim 4, wherein performing a risk assessment for each user associated with the abnormal alarm event further comprises:
and evaluating the importance level of each user related to the abnormal alarm event.
6. The method of claim 5, wherein the assessing the importance level of each user associated with the abnormal alarm event comprises: and evaluating the importance level of each user related to the abnormal alarm event according to the electricity utilization load.
7. The method of claim 5, wherein performing the user risk level assessment for each user associated with the abnormal alarm event according to the user outage probability risk value, the user outage duration risk value, and the user power loss risk value for each user associated with the abnormal alarm event comprises:
setting safety thresholds of a user power failure probability risk value, a user power failure duration risk value and a user electric quantity loss risk value corresponding to the importance level according to the importance level of each user related to the abnormal alarm event;
and evaluating the user risk level of each user related to the abnormal alarm event according to the user power failure probability risk value, the user power failure duration risk value and the safety threshold of the user electric quantity loss risk value.
8. The method of claim 5, wherein the user with the importance level higher than the preset level is set as an important user, and the generating of the accident emergency treatment plan according to the risk assessment result of the abnormal alarm event comprises:
and when the user risk level of the important user is greater than a preset level, generating a plurality of accident handling transfer plans for the important user.
9. The method of claim 8, wherein generating a plurality of incident handling offers for the important user comprises:
and sequencing the multiple accident emergency treatment plans according to the electricity utilization load, the number of operation switches and the load balancing degree.
10. A system for preventing accidents in a large power distribution network, comprising:
the abnormal alarm signal collection module is used for collecting abnormal alarm signals in the main power network and the power distribution network;
the abnormal alarm event judging module is used for judging an abnormal alarm event according to the abnormal alarm signal and the expert alarm rule base;
the risk evaluation module is used for carrying out risk evaluation on the abnormal alarm event;
and the plan generating module is used for generating an accident emergency treatment plan according to the risk evaluation result of the abnormal alarm event.
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