CN102368316A - Real-time topology based precontrol method for reliability of distribution network - Google Patents

Abstract

The invention discloses a distribution network reliability pre-control method based on real-time topology. Based on the distribution network automation system, the switch remote signaling information in each line section in the distribution network automation system is input into the distribution network automation system; the pre-control method of the present invention In order to: monitor the switch remote signal displacement information in the distribution network in real time; group the captured remote signal displacement switches according to the line and electrical island; and then evaluate whether each group of switches is powered off or Power transmission operation; for the switch group of power failure operation, carry out the local topology of the whole network, record the start time of power failure, the switch section of power failure, and the distribution transformer and load included in the power failure switch section; for the switch group of power transmission operation, query the registered Find the corresponding power outage event for closed-loop processing, and update its power outage end time, household hours, power shortage and other information. This method can ensure the real-time recording of all blackout events, thus laying the foundation for the accuracy of reliability statistics.

Description

A Reliability Pre-control Method of Distribution Network Based on Real-time Topology

technical field

The invention relates to the field of power distribution reliability application technology in power systems, in particular to a distribution network reliability pre-control method based on real-time topology.

Background technique

In the power system, the power distribution system is directly connected to the power generation and transmission system and users, and is responsible for directly supplying and distributing electric energy to users. It has the characteristics of a large amount of equipment and complex operation methods. According to effective statistics, about 80% of user power outages are planned power outages. Therefore, reliability management is of great significance in the planning, construction and operation of power distribution systems.

The power supply reliability of the power distribution network is directly related to the safety and reliability of users' electricity consumption, the survival and development of power supply enterprises, and the development of the entire city. Therefore, how to ensure and improve the safe and reliable operation of the distribution network is an important issue that every power supply enterprise must care about. the

The definition of power supply reliability is: the ability of the power supply system to continuously supply power to users. It is an important content of power reliability management, which reflects the degree to which the power industry meets the power demand of the national economy, and it uses the reliability rate of power supply as a measurement index. The reliability rate of power supply refers to the ratio of the total hours of effective power supply to users to the number of hours in the statistical period during the statistical period. the

The power distribution system is at the end of the power system and is directly connected to the user. Once the power distribution system or equipment fails or undergoes maintenance or testing, it will often cause the system to interrupt the power supply to the user at the same time until the fault of the power distribution system and its equipment is eliminated. The power supply capacity and quality of the entire power system to users must be reflected through the power distribution system. The reliability index of the power distribution system is actually the structure and quality of the entire power system. Concentrated reflection of operating characteristics.

Distribution reliability involves many factors:

On the one hand, it includes management measures to improve the sense of responsibility and technical level of technicians, and to pay attention to the reliability of power supply in the management of urban power grids;

On the other hand, it is mainly the improvement of technology and facilities: under the premise of considering the economy, optimize the structure of the old power distribution network, and update and transform the equipment.

However, the current status quo is that many power supply enterprises are not strict enough in reliability management, and it is difficult to grasp the specific power outage time and scope, so it is difficult to provide basic support for management decision-makers. Therefore, how to ensure real-time and accurate reliability basic data is the primary problem to be solved in distribution network reliability management.

Many professionals focus on reliability evaluation methods and have done a lot of research work. For example, in the patent application with the publication number [102013085A], it is proposed to use the analytic hierarchy process to establish a distribution network reliability evaluation system; the publication number is [101685968] The patent proposes a fault diffusion method for distribution network reliability assessment, which involves a radially operating medium-voltage distribution network reliability assessment method. Mainly use the computer, through the software program, use the state enumeration method to enumerate the fault event enumeration calculation of each component in the distribution network, and perform the calculation and output of the power flow calculation of the distribution network and the reliability index of the distribution network. The patent application with the publication number [101562339] realizes the calculation method of distribution system reliability index based on success flow, which has the characteristics of simple model, less time-consuming calculation, high precision, and can be used in large-scale systems, and can obtain The indicators of each load point provide a basis for the microscopic limit value management of individual reliability.

However, if the basic data of the power outage event is vague, all methods and principles are difficult to reflect the objective reality. For example, in the current actual power outage event, the start and end time of the power outage are manually reported by the dispatcher, and there is a considerable time error; the scope of the power outage is manually checked by the reliability management personnel, and it is inevitable that there will be mistakes, etc., and the power outage information cannot be guaranteed. is accurate.

Contents of the invention

The present invention provides a distribution network reliability pre-control method based on real-time topology. On the basis of distribution network automation, the accuracy and reliability of the two core indicators of power outage reliability statistics - power outage time and number of users are guaranteed from the source of data, thereby Ensure real-time, accurate and comprehensive power outage events.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a distribution network reliability pre-control method based on real-time topology, based on the distribution network automation system, the distribution network automation system includes more than one line segment identified by ID; each The switch remote signaling information in the line section is input into the distribution network automation system; including the following steps:

(1). Real-time monitoring of the switch remote signal displacement information in each line segment in the distribution network, divide the segmented switches that capture the displacement information into more than one distribution network switch group according to the line, and then divide each contact switch according to its belonging The electrical islands of the distribution network are merged into the corresponding distribution network switch group, and the main network circuit breaker is merged into the corresponding distribution network switch group according to the electrical island to which the node of the power distribution end belongs;

The electrical island refers to a group of electrical equipment ranges that are topologically connected to the feeder section of a main network switch outlet through the switch and the feeder section. For example, an independent medium-voltage line not connected with a tie switch, or multiple medium-voltage lines connected to each other through a tie switch and accessible to any two internal points. It reflects the static structure of electrical equipment connections, determined by internal connectivity, regardless of the state of devices such as switches;

(2). According to the switch type and its operating state of each switch in the switch group, evaluate whether the operation type of each group of switches is power-off operation or power-on operation;

(3). For the switch group in power failure operation, the local topology of the whole network is carried out from the power distribution end of the main network circuit breaker, including steps:

(3.1) Determine whether there is a distribution network switch in the switch group according to the switch type. If not, record each switch segment according to the main network switch topology of the entire line, that is, record all switch segment objects on the line, including each switch segment. Which switches are composed, which distribution transformers and load information are in the switch section; if there is a distribution network switch, query the line ID according to the distribution network switch, then query the main network switch according to the line ID, and then record each switch section;

(3.2) With the main network switch and the contact switch operated by pulling and closing as the power point, perform dyeing operation on each switch section in the topology structure to judge whether the switch section is charged; record the power-off switch section and its power-off start time, and Distribution transformer and load information included in the power-off switch section;

(4). For the switch group of power transmission operation, query the registered power outage events, find the corresponding power outage event from the switch line section that has not yet been closed-loop and is in the power-off state, and perform closed-loop processing, and update the current switch group record in Attribute information in the distribution network automation system.

As an improvement, when the remote signal displacement information of the distribution network switch is monitored in real time in step (1), the distance between the remote signal displacement information captured by each scan and the switch object that finally obtains the remote signal displacement is set. There is a waiting time; the end of the waiting time is based on the fact that the number of remote signaling switches no longer changes.

In the distribution network, the section switch (normally closed) and the contact switch (normally opened) are switch types classified according to the nature of use. For power failure operation, it is generally necessary to open the corresponding section switch. If there is a load transfer, it is necessary to close the corresponding contact switch; for power transmission operation, it is generally necessary to pull the corresponding section switch. If there is an associated The tie switch may also be split to divert the load from the original line. Therefore, it can be deduced inversely from the type of the switch and its corresponding operation type whether the group of switches realizes the power-off operation or the power-transmitting operation. Therefore, the method for evaluating the operation type of each group of switches described in step (2) of the present invention includes steps:

2.1). Define the possibility of power failure as X and the possibility of power transmission as Y;

2.2). Judging the operation type of the segment switch, if it is a separate operation, X=X+1, if it is a pull operation, then Y=Y+1;

2.3). Judging the operation type of the contact switch, if it is a separate operation, then Y=Y+1, if it is a pull operation, then X=X+1;

2.3). Comprehensively compare the size of X and Y. If X is greater than Y, the current group of switches implements a power-off operation, otherwise it is a power-on operation.

After the closed-loop processing in step (4) of the present invention, the attribute information of the current switch group updated in the distribution network automation system includes the end time of the power outage, the number of household hours, the amount of power shortage, and other basic parameters of reliability statistics. The power outage end time is the operation time of the last segment switch in the process of realizing the closed-loop processing of the power outage event in the current switch group.

The pre-control method of the present invention can be programmed according to the existing mature software technology, and combined with the hardware in the distribution network automation system to realize the purpose of the real-time topology-based distribution network reliability pre-control method of the present invention.

Beneficial effect

The basis of reliability statistics lies in the perfection and timely maintenance of power outage event information. When the present invention is applied based on the distribution network automation system, because whether it is a planned power outage or a fault power outage, it will be accompanied by the tripping and closing action of the switch, that is, it must be accompanied by Because of the generation of switch remote signal displacement information, the present invention uses remote signal displacement information to trigger the monitoring process of power outage events, and can accurately record reliability basic parameters such as power outage and power transmission time, range, and household hours.

In order to distinguish the possibility of different power failure and power transmission events at the same time, the present invention also independently groups the captured remote signal displacement information switches, a group of switches corresponds to a possible power failure or power transmission event, and then according to the type of each group of switches and The operation state determines the operation type of the current switch group, thus ensuring that there is no interference between the switch operations among multiple power failure events at the same time.

In order to accurately analyze all switch section objects on the line, for the switch group operated by power failure, the present invention uniformly performs the whole line topology from the source of the line-the power distribution end of the main network circuit breaker, and records each power-off switch section; after the topology is completed , each switch section on the line will be in a tree structure, after the switch section dyeing operation is performed with the main network switch and the tie switch operated by pull-on operation as the power point, all the power-off switch sections and the included ones can be accurately analyzed Distribution transformer and load information.

Since the distribution network automation system can automatically monitor the generated power outage events, it must also perform closed-loop processing to completely maintain a power outage event information. Therefore, after the present invention is judged to be a power transmission operation, it first needs to inquire about the power outage events that have not yet been closed-loop and include the current switch group switch in the power-off switch section, check the end time of the power outage, and record the current switch group switch if it has not been maintained. The operation time, and at the same time, real-time closed-loop processing of power outage events such as the number of hours of outage households and the amount of power shortage.

This method can ensure the real-time recording of all power outage events, thereby laying the foundation for the accuracy of reliability statistics and providing support for reliability management decision-making.

Description of drawings

Fig. 1 is a schematic flow chart of the overall steps of the present invention;

Fig. 2 is a schematic diagram of the remote signaling displacement information monitoring process in step (1) of the present invention;

Fig. 3 is a schematic diagram of switch grouping process in step (1) of the present invention;

Fig. 4 is a schematic diagram of the evaluation process of switch group operation type in step (2) of the present invention;

Fig. 5 is a schematic flow chart showing the topology analysis and dyeing of the switch group in power failure operation in step (3) of the present invention;

FIG. 6 is a schematic diagram of a closed-loop flow diagram of a power outage event in step (4) of the present invention;

Fig. 7 is a schematic diagram showing the structure of a distribution network ring network in an application example of the present invention.

Detailed ways

In order to make the content of the present invention more obvious and understandable, further description will be made below in conjunction with the accompanying drawings and specific embodiments.

The distribution network reliability pre-control method based on real-time topology of the present invention is based on the distribution network automation system, and the distribution network automation system includes more than one line section identified by ID; the switch remote signaling information in each line section is input to the distribution network In the automation system; In conjunction with Fig. 1, the reliability pre-control method of the present invention comprises the following steps:

(1). Real-time monitoring of the switch remote signal displacement information in each line segment in the distribution network, combined with Figure 3, the segmented switches that capture the displacement information are divided into more than one distribution network switch group according to the line, and then each contact switch According to the electrical island to which it belongs, it is merged into the corresponding distribution network switch group, and at the same time, the main network circuit breaker is merged into the corresponding distribution network switch group according to the electrical island to which the node of the power distribution end belongs;

(2). According to the switch type and operating state of each switch in the switch group, evaluate whether the operation type of each group of switches is power-off operation or power-on operation; the steps are shown in Figure 4, including:

2.1). Define the possibility of power failure as X and the possibility of power transmission as Y;

2.2). Judging the operation type of the segment switch, if it is a separate operation, X=X+1, if it is a pull operation, then Y=Y+1;

2.3). Judging the operation type of the contact switch, if it is a separate operation, then Y=Y+1, if it is a pull operation, then X=X+1;

2.3). Comprehensively compare the size of X and Y. If X is greater than Y, the current group of switches implements a power-off operation, otherwise it is a power-on operation.

(3). For the switch group in power failure operation, the local topology of the whole network is carried out from the power distribution end of the main network circuit breaker. The steps are shown in Figure 5, including:

(3.1) Determine whether there is a distribution network switch in the switch group according to the switch type. If not, record each switch segment according to the main network switch topology of the entire line, that is, record all switch segment objects on the line, including each switch segment. Which switches are composed, which distribution transformers and load information are in the switch section; if there is a distribution network switch, query the line ID according to the distribution network switch, then query the main network switch according to the line ID, and then record each switch section;

(3.2) With the main network switch and the contact switch operated by pulling and closing as the power point, perform dyeing operation on each switch section in the topology structure to judge whether the switch section is charged; record the power-off switch section and its power-off start time, and Distribution transformer and load information included in the power-off switch section;

(4). Combined with Figure 6, for the switch group of power transmission operation, query the registered power outage events, find the corresponding power outage events from the switch line section that has not yet been closed-loop and is in the power-off state, and perform closed-loop processing, and update the current The attribute information of the switch group recorded in the distribution network automation system, including the end time of the power outage, the number of household hours, and the amount of power shortage, etc., where the end time of the power outage is the last segment of the current switch group in the process of realizing the closed-loop processing of the power outage event The operating time of the switch.

Combined with Figure 2, when the real-time monitoring of the remote signaling displacement information of the distribution network switch is carried out in step (1), each scan captures the remote signaling displacement information, and the switch object that finally obtains the remote signaling displacement is set. Waiting time; the end of the waiting time is based on the fact that the number of remote signaling switches no longer changes.

Fig. 7 shows the distribution network ring network structure in an application example of the present invention, A6 and B6 are tie switches, and the others are section switches. Taking Line I of Shanghai Road Substation as an example, if the line section A3-A4 is to be repaired, it needs to be powered off, and the users of the A4-A5 section will be transferred from the opposite line. The specific operation of the dispatcher is: pull the A4 switch, close the A6 switch, and pull the A3 switch. At this time, three switch remote signal displacement information must be generated in the dispatch automation system, including the operation direction and operation time of the switch; if A3 -After the maintenance of A4 is completed, the users in this section need to restore the power supply. Similarly, the dispatching operation is: close the A4 switch, pull the A6 switch, close the A3 switch, and the dispatching automation system will automatically record the operating direction of the switch, Operating time.

According to the power outage event recording process from step (1) to step (4), first, the system monitoring process finds the remote signal displacement information of the relevant switch, and records the operation information of the switch A3, A4, A6; secondly, it can be seen that A3, A4, A6 They belong to the same line and the same electrical island, so they can be divided into the same group of operation switches, that is, one stop and power transmission operation; pulling A4, closing A6, and pulling A3 is obviously a power failure operation, while closing A4, pulling A6, When A3 is closed, it is judged as power transmission operation; for power failure operation, after performing topology analysis of the whole line, all switch section objects are obtained: Shanghai Road Substation I-A1, A1-A2, A2-A3, A3-A4, A4-A5, A5 -A6, then dye the power point, that is, the outlet switch and the contact switch can be identified as the power point, and then dye according to the switch status. Finally, the analysis shows that the power-off switch section is A3-A4 section, and the system will automatically record the configuration in this section. During the power transmission operation, we found that the switches A3, A4, and A6 already existed in the previously recorded unclosed-loop power outage event, and then recorded the operation time of the last section switch A3 operated at this time as the end of the power outage Time, statistics and calculation of power outage hours, power shortage and other information.

Result verification: Through the real system operation, it can be seen that the specific power transmission time of the power outage event is completely equal to the specific switch operation event, and the distribution transformer, load quantity, and capacity in the power outage range are consistent with the real ones, and the system guarantees the power outage event attributes The real-time performance and accuracy have proved the effectiveness of the invention in practice.

The specific implementation cases described in the present invention are only preferred implementation cases of the present invention, and are not intended to limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the content of the patent scope of the present invention should be regarded as the technical scope of the present invention.

Claims (5)

1. the preparatory control method of distribution reliability based on real-time topology based on distribution automation system, comprises the part of path that identifies with ID more than 1 in the distribution automation system; Switch remote signalling information in each part of path inputs in the distribution automation system, it is characterized in that, may further comprise the steps:

Switch remote signalling displacement information in the monitoring distribution in real time in each part of path; Block switch to capturing displacement information is divided into 1 above distribution switches set by circuit; Then each interconnection switch is integrated in the corresponding distribution switches set according to the electric island under it, simultaneously the major network isolating switch is integrated in the corresponding distribution switches set according to the electric island under the node of its distribution end;

Based on the switchtype and the mode of operation thereof of each switch in the switches set, assess the action type of every group of switch and still send the electricity operation for the operation that has a power failure;

To the switches set of the operation that has a power failure, carry out the whole network local topology from the distribution end of major network isolating switch, comprise step:

(3.1) judge according to switchtype whether the distribution switch is arranged in the switches set, if not then, write down each switch segments according to major network switch topology whole piece circuit; If have then, according to circuit ID inquiry major network switch, write down each switch segments more then according to distribution switch inquiry circuit ID;

(3.2) interconnection switch with major network switch, drawing operation is a power supply point, and each switch segments in the topological structure is carried out dying operation; Record dead electricity switch segments and power failure start time thereof, and the dead electricity switch segments comprises in the power failure scope distribution transforming and information on load;

To sending the switches set of electricity operation; Inquire about registered power-off event; From current also do not have closed loop and be in the switching line highway section of power failure state find corresponding power-off event to carry out closed-loop process, upgrade current switches set simultaneously and be recorded in the attribute information in the distribution automation system.

2. the preparatory control method of distribution reliability based on real-time topology according to claim 1; It is characterized in that; When in the step (1) power distribution network switch remote signalling displacement information being monitored in real time; Scan capture arrives remote signalling displacement information each time, and finally obtains between the switch object of remote signalling displacement, is provided with the stand-by period; The termination of stand-by period becomes number of switches with remote signalling and no longer is changed to foundation.

3. the preparatory control method of distribution reliability based on real-time topology according to claim 1 is characterized in that the method for described in the step (2) action type of every group of switch being assessed comprises step:

2.1). definition power failure possibility is X, and sending electric possibility is Y;

2.2). judge the action type of block switch, if be separate operation then X=X+1, if operate then Y=Y+1 for drawing;

2.3). judge the action type of interconnection switch, if be separate operation then Y=Y+1, if operate then X=X+1 for drawing;

2.3). the comprehensive size of X and Y relatively, if X greater than Y, what then the present group switch was realized is the operation that has a power failure, on the contrary then for sending electric the operation.

4. the preparatory control method of distribution reliability based on real-time topology according to claim 1; It is characterized in that; After the closed-loop process, the current switches set attribute information that is updated in the distribution automation system comprises number when having a power failure concluding time, family, lacks delivery in the step (4).

5. the preparatory control method of distribution reliability based on real-time topology according to claim 4 is characterized in that, the said power failure concluding time does, current switches set in the process that realizes the power-off event closed-loop process, the running time of last block switch.

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