CN114722340B - Power distribution network power outage range analysis method - Google Patents
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Abstract
The invention relates to a power failure range analysis method for a power distribution network, belongs to the technical field of power failure rush repair and power supply service of the power distribution network, and can effectively solve the problem that the power failure range cannot be effectively analyzed and identified by a traditional method when monitoring equipment is not additionally arranged on a power distribution network switch or information of the outdoor switch monitoring equipment is not reported. According to the power distribution network power outage range analysis method provided by the invention, the actual power loss information of the distribution area is only utilized to obtain the tripping probability of different circuit breakers (or switches) of the line, the power outage range is analyzed, and a new thought is provided for power distribution network power outage range analysis.
Description
Technical Field
The invention belongs to the technical field of power distribution network power outage rush repair and power supply service, and particularly relates to a power distribution network power outage range analysis method.
Background
Along with the acceleration of digital transformation of a power distribution network, more and more sensing devices are widely installed in the power distribution network, and the power distribution network is provided with a considerable and measurable area from an original 'blind area'. However, one distribution line, especially a rural distribution line, is generally longer, and more circuit breakers, sectionalizers, fuses and low-voltage circuit breakers in a transformer area are involved, and monitoring equipment is not additionally arranged on all the switches or the circuit breakers. When the line breaks down, a certain switch is subjected to overcurrent fast tripping and fault removal, if the switch is additionally provided with monitoring equipment, the operation monitoring background can receive tripping information in real time, and the power failure range identification of the power distribution network is accurately completed. However, since the monitoring device is installed outdoors or some circuit breakers (or switches) are not additionally provided with the monitoring device, the condition that the circuit breakers (or switches) are not reported or the tripping information is not received may occur after the circuit breakers (or switches) are tripped, and then the conventional method for identifying the power failure range through the tripping of the switches is failed.
Therefore, a power distribution network power outage range analysis method needs to be designed at the present stage to solve the problems.
Disclosure of Invention
The invention aims to provide a power distribution network power outage range analysis method which is used for solving the technical problems in the prior art, such as: the identification of the power failure range of the traditional power distribution network is realized according to the relation between the tripping information of the switches and the network topology, however, monitoring equipment is not additionally arranged in the power distribution network, and meanwhile, the condition that information is not reported by the outdoor switch monitoring equipment exists can not be analyzed and identified when the condition is met by the traditional method.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a power distribution network power outage range analysis method comprises the following steps:
step 1: after the power distribution network fails, the monitoring background analyzes various information sent by the monitoring equipment, if the switching tripping information exists, the power failure range of the power distribution network is directly generated according to the topology connection relation of the power distribution network, and if the switching tripping information does not exist, the step 2 is skipped;
step 2: starting power failure range identification according to the power failure information of the transformer area, firstly determining a specific analyzed line by utilizing the connection relation between the line and the transformer area, and collecting the power failure information conditions of all transformer areas under the line at the same time;
step 3: according to the mapping table of the tripping operation and the power failure information of the circuit breaker, the actually received power failure information of the transformer area is used for comparison and calculation of the tripping probability of different circuit breakers;
step 4: selecting a breaker with the highest tripping probability under the line, and generating a power failure range of the power distribution network according to the topological connection relation of the power distribution network;
the monitoring background is a distribution automation master station, and the monitoring equipment is a distribution network outgoing line breaker protection device, a distribution automation terminal, a platform area intelligent fusion terminal and a platform area intelligent leakage protection device.
Further, before step 1 is performed, the distribution automation master station firstly acquires the topology relation of the distribution network line from the production management system to form a basic database of the breaker tripping and station area power-loss information mapping table;
the tripping information is from a distribution network outgoing line breaker protection device and a distribution automation terminal which are installed on site, and the power loss information of the transformer area is from a transformer area intelligent fusion terminal and a transformer area intelligent leakage protection device and is transmitted to the distribution automation master station in real time.
Furthermore, before executing step 2, the distribution automation master station needs to meet the condition that only the power failure information of the station area is received in the same period and the tripping information of the circuit breaker is not available on the line connected with the station area, and the power failure range starting analysis and recognition are realized in the distribution automation master station.
Further, the mapping table of the breaker tripping and station area power failure information in the step 3 is obtained by the following way:
firstly, obtaining the corresponding relation between the circuit breaker and the upstream and downstream of the transformer area according to the topological connection relation of the power distribution network and the power supply side;
when the circuit breaker trips, the station area downstream of the circuit breaker must have power-down information, which is represented by '1'; upstream or other areas have no power-off information, which is represented by '0', so as to obtain a mapping matrix A;
wherein M represents the number of circuit breakers on the distribution network line, N represents the number of station areas hung on the distribution network line, A MN Representing the tripping of the Mth circuit breaker, and the N-th station area has the information of no-power-loss.
Further, in step 3, the probability of tripping different circuit breakers is calculated by comparing the actually received power-loss information of the transformer area, comprising the following steps:
1) Obtaining a power failure information matrix B according to a power failure information table of a station area actually received by a power distribution automation master station;
B＝[B 11 B 12 …B 1N ]
wherein B is 1N Representing the situation of power failure information of the N-th station area, wherein the situation is 1 if the power failure information is 1, and the situation is 0 if the power failure information is not 0;
2) Comparing each column of data of the power-off information matrix B of the station area with the same column of data in different rows of the mapping matrix A to obtain a matrix C;
wherein C is MN Represents B 1N And A is a MN The value of (B) after comparison 1N And A is a MN Taking a '1' when the data are the same, and taking a '0' when the data are different;
3) The tripping probability of different circuit breakers is obtained by utilizing the matrix C, and the calculation formula is as follows;
wherein: i represents an i-th breaker, i= [1,2., M ], N represents an N-th bay.
Further, in step 4, the breaker with the highest probability of tripping is the slave P i Selecting; probability of tripping P if there are multiple switches i And if the calculated tripping probabilities of the two switches are the same, the sectionalized switch is tripped to judge the power failure range of the power distribution network.
Compared with the prior art, the invention has the following beneficial effects:
the power distribution network switch has the beneficial effects that the problem that the power outage range cannot be effectively analyzed and identified by the traditional method when monitoring equipment is not additionally arranged on the power distribution network switch or information of the outdoor switch monitoring equipment is not reported can be effectively solved. According to the power distribution network power outage range analysis method provided by the invention, the actual power loss information of the distribution area is only utilized to obtain the tripping probability of different circuit breakers (or switches) of the line, the power outage range is analyzed, and a new thought is provided for power distribution network power outage range analysis.
Drawings
Fig. 1 is a schematic diagram of a step flow principle in an embodiment of the present application.
Fig. 2 is a schematic diagram of a power distribution network structure case according to an embodiment of the present application.
Detailed Description
For the purpose of making the technical solution and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention. It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Examples:
one distribution line, especially a rural distribution line, is generally longer, and more circuit breakers, sectionalizers, fuses and low-voltage circuit breakers in a transformer area are involved, and monitoring equipment is not additionally arranged on all the switches or the circuit breakers. When the line breaks down, a certain switch is subjected to overcurrent fast tripping and fault removal, if the switch is additionally provided with monitoring equipment, the operation monitoring background can receive tripping information in real time, and the power failure range identification of the power distribution network is accurately completed. However, since the monitoring device is installed outdoors or some circuit breakers (or switches) are not additionally provided with the monitoring device, the condition that the circuit breakers (or switches) are not reported or the tripping information is not received may occur after the circuit breakers (or switches) are tripped, and then the conventional method for identifying the power failure range through the tripping of the switches is failed.
As shown in fig. 1, a power outage range analysis method for a power distribution network is provided, which includes the following steps:
step 1: after the power distribution network fails, the monitoring background analyzes various information sent by the monitoring equipment, if the information is switch tripping information, the power failure range of the power distribution network is directly generated according to the topology connection relation of the power distribution network, if the information is not switch tripping information, the step 2 is skipped.
Step 2: and starting power failure range identification according to the power failure information of the transformer area, firstly determining a specific analyzed line by utilizing the connection relation between the line and the transformer area, and collecting the power failure information conditions of all transformer areas under the line at the same time.
Step 3: and comparing and calculating the tripping probability of different circuit breakers (switches) by utilizing the actually received power loss information of the transformer area according to the mapping table of the tripping and the power loss information of the circuit breakers (or switches).
Step 4: and selecting a breaker (switch) with the highest tripping probability under the line, and generating a power failure range of the power distribution network according to the topological connection relation of the power distribution network.
Wherein: the monitoring background is a distribution automation master station, and the monitoring equipment is a distribution network outgoing line breaker protection device, a distribution automation terminal, a transformer area intelligent fusion terminal and a transformer area intelligent leakage protection device.
Further, before step 1, the distribution automation master station firstly obtains the topology relation of the distribution network line from a Production Management System (PMS) to form a basic database of a breaker (or switch) tripping and station zone power loss information mapping table.
The distribution network outgoing line breaker protection device comprises a distribution network outgoing line breaker protection device, a distribution automation terminal, a distribution area power loss information acquisition device, a distribution area intelligent fusion terminal and a distribution area intelligent leakage protection device, wherein the distribution network outgoing line breaker protection device and the distribution automation terminal are installed on site, and the distribution area power loss information can be transmitted to the distribution automation master station in real time.
Furthermore, before step 2 is executed, the distribution automation master station needs to meet the condition that only the power failure information of the station area is received in the same period and the tripping information of the circuit breaker (or switch) is not arranged on the line connected with the station area, and the power failure range starting analysis and identification are realized in the distribution automation master station.
Further, the mapping table of the breaker (or switch) trip and station area power loss information in step 3 is obtained by the following way:
firstly, obtaining the corresponding relation between the circuit breaker (or switch) and the upstream and downstream of the transformer area according to the topological connection relation of the power distribution network and the power supply side.
When the breaker (or switch) trips, then the zone downstream of the breaker (or switch) must have power loss information, indicated by a "1"; the upstream or other zones have no power loss information, indicated by a "0", resulting in a mapping matrix a.
Wherein M represents the number of circuit breakers (or switches) on the distribution network line, N represents the number of transformer areas hung on the distribution network line, A MN Representing the tripping of the Mth circuit breaker (or switch), and the existence of the power failure information of the Nth station area.
Further, in step 3, the probability of tripping of different circuit breakers (switches) is calculated by comparing the actually received power-loss information of the transformer area, which comprises the following steps.
1) And obtaining a power failure information matrix B according to the power failure information table of the station area actually received by the power distribution automation master station.
B＝[B 11 B 12 …B 1N ]
Wherein B is 1N The N-th station area power-down information is represented by 1 if it is, and 0 if it is not.
2) And comparing each column of data of the power-off information matrix B of the station area with the same column of data in different rows of the mapping matrix A to obtain a matrix C.
Wherein C is MN Represents B 1N And A is a MN The value of (B) after comparison 1N And A is a MN Data is taken as "1" when the data is the same, and "0" when the data is different.
3) The matrix C is used to derive the trip probabilities for the different circuit breakers (or switches) and the calculation formula is as follows.
Wherein: i represents an i-th circuit breaker (or switch), i= [1,2., M ], N represents an N-th bay.
Further, in step 4, the breaker (switch) with the highest probability of tripping is the slave P i Is selected. Probability of tripping P if there are several switches i And if the calculated tripping probabilities of the two switches are the same, the power failure range of the power distribution network is judged by tripping the sectionalizer switch.
Case analysis:
as shown in fig. 2, a simple distribution network is proposed, which is composed of a feeder line and multiple branch lines, wherein STA is a transformer substation, S1 represents a transformer substation outlet switch, S4 and S8 are segment switches on the feeder line, S2, S3, S5, S6, S7, S9 and S10 are drop fuses, D1 to D7 are leakage protection devices corresponding to 7 transformer areas, and T1 to T7 are distribution transformers. From the foregoing description, it can be seen from fig. 2 that the mapping matrix a has an M parameter of 10 and an n parameter of 7, so that a mapping matrix a with dimensions of 10×7 can be generated:
when a short circuit fault occurs in the area between the switch S1 and the switch S2 in fig. 2, under normal conditions, the distribution automation master station should receive the power-down information of the station areas 3 to 7, and if there is a loss of the actually received power-down information of the station areas, the power-down information matrix B1 is:
B1＝[0 0 1 0 1 1 1]
according to the matrix B1, it can be seen that the power-loss information is not sent to the station area 4, and the matrix B1 is compared with the mapping matrix a, so that the matrix C1 is obtained as follows:
the probability of tripping the 15 switches in fig. 2 can be calculated according to the matrix C1, respectively, as shown in the following table:
table 1 switch trip probability calculation results
As can be seen from the data in the table, the probability of tripping the S4 switch is maximum, and the power outage range from the station 3 to the station 7 can be analyzed according to the network connection relation from the position of the S4 switch.
If two pieces of power-loss information (the probability of occurrence of the situation is extremely low) of the station area actually received by the power distribution automation master station are missing, the power-loss information matrix B2 is as follows:
B2＝[0 0 1 0 1 0 1]
according to the matrix B2, the power failure information is not sent to the station area 4 and the station area 6, and the matrix B2 is compared with the mapping matrix A, so that a matrix C2 is obtained as follows:
the probability of tripping the 15 switches in fig. 2 can be calculated according to the matrix C2, respectively, as shown in the following table:
table 2 switch trip probability calculation results
The data in the table shows that the probability of tripping the S4, S5, S7 and S10 switches is the largest and equal, but note that the S5, S7 and S10 are all drop-out fuses, and the probability of tripping 3 drop-out fuses at the same time (namely, a plurality of short circuit faults exist on the large feeder at the same time) is small, so that the probability of tripping the S4 sectionalized switch is the largest, and the power failure range from the station 3 to the station 7 can be analyzed according to the network connection relation.
Therefore, the method can effectively solve the problem that the power failure range cannot be effectively analyzed and identified by the traditional method when the monitoring equipment is not additionally arranged on the power distribution network switch or information of the outdoor switch monitoring equipment is not reported. According to the power distribution network power outage range analysis method provided by the invention, the actual power loss information of the distribution area is only utilized to obtain the tripping probability of different circuit breakers (or switches) of the line, the power outage range is analyzed, and a new thought is provided for power distribution network power outage range analysis.
The above is a preferred embodiment of the present invention, and all changes made according to the technical solution of the present invention belong to the protection scope of the present invention when the generated functional effects do not exceed the scope of the technical solution of the present invention.
Claims (4)
1. The power failure range analysis method for the power distribution network is characterized by comprising the following steps of:
step 1: after the power distribution network fails, the monitoring background analyzes various information sent by the monitoring equipment, if the switching tripping information exists, the power failure range of the power distribution network is directly generated according to the topology connection relation of the power distribution network, and if the switching tripping information does not exist, the step 2 is skipped;
step 2: starting power failure range identification according to the power failure information of the transformer area, firstly determining a specific analyzed line by utilizing the connection relation between the line and the transformer area, and collecting the power failure information conditions of all transformer areas under the line at the same time;
step 3: according to the mapping table of the tripping operation and the power failure information of the circuit breaker, the actually received power failure information of the transformer area is used for comparison and calculation of the tripping probability of different circuit breakers;
step 4: selecting a breaker with the highest tripping probability under the line, and generating a power failure range of the power distribution network according to the topological connection relation of the power distribution network;
the monitoring background is a distribution automation master station, and the monitoring equipment is a distribution network outgoing line breaker protection device, a distribution automation terminal, a platform intelligent fusion terminal and a platform intelligent leakage protection device;
the mapping table of the breaker tripping and station area power failure information in the step 3 is obtained by the following modes:
firstly, obtaining the corresponding relation between the circuit breaker and the upstream and downstream of the transformer area according to the topological connection relation of the power distribution network and the power supply side;
when the circuit breaker trips, the station area downstream of the circuit breaker must have power-down information, which is represented by '1'; upstream or other areas have no power-off information, which is represented by '0', so as to obtain a mapping matrix A;
wherein M represents the number of circuit breakers on the distribution network line, N represents the number of station areas hung on the distribution network line, A MN Representing the tripping of an Mth circuit breaker, and whether the Nth station area has power failure information or not;
in the step 3, the actual received power failure information of the transformer area is used for comparison and calculation of the tripping probability of different circuit breakers, and the method comprises the following steps:
1) Obtaining a power failure information matrix B according to a power failure information table of a station area actually received by a power distribution automation master station;
B＝[B 11 B 12 …B 1N ]
wherein B is 1N Representing the situation of power failure information of the N-th station area, wherein the situation is 1 if the power failure information is 1, and the situation is 0 if the power failure information is not 0;
2) Comparing each column of data of the power-off information matrix B of the station area with the same column of data in different rows of the mapping matrix A to obtain a matrix C;
wherein C is MN Represents B 1N And A is a MN The value of (B) after comparison 1N And A is a MN Taking a '1' when the data are the same, and taking a '0' when the data are different;
3) The tripping probability of different circuit breakers is obtained by utilizing the matrix C, and the calculation formula is as follows;
wherein: i represents an i-th breaker, i= [1,2., M ], N represents an N-th bay.
2. The method for analyzing the power outage range of the power distribution network according to claim 1, wherein before the step 1 is carried out, the power distribution automation master station firstly acquires the topology relation of the power distribution network lines from the production management system to form a basic database of a circuit breaker tripping and station area power loss information mapping table;
the tripping information is from a distribution network outgoing line breaker protection device and a distribution automation terminal which are installed on site, and the power loss information of the transformer area is from a transformer area intelligent fusion terminal and a transformer area intelligent leakage protection device and is transmitted to the distribution automation master station in real time.
3. The method for analyzing the power outage scope of the power distribution network according to claim 2, wherein before the step 2 is executed, the power distribution automation master station needs to meet the condition that only the power loss information of the transformer area is received in the same time period and the tripping information of the circuit breaker is not arranged on the line connected with the transformer area, and the power outage scope starting analysis and identification are realized in the power distribution automation master station.
4. A power distribution network outage scope analysis method according to claim 1, wherein in step 4, the breaker having the highest probability of tripping is the slave P i Selecting; probability of tripping P if there are multiple switches i And if the calculated tripping probabilities of the two switches are the same, the sectionalized switch is tripped to judge the power failure range of the power distribution network.
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