CN114722340A - Power distribution network power failure range analysis method - Google Patents
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Abstract
The invention relates to a power distribution network power failure range analysis method, belongs to the technical field of power distribution network power failure emergency repair and power supply service, and can effectively solve the problem that a power failure range cannot be effectively analyzed and identified by using a traditional method when a power distribution network switch is not additionally provided with monitoring equipment or information of outdoor switch monitoring equipment is not reported. According to the method for analyzing the power failure range of the power distribution network, the probability of tripping of different circuit breakers (or switches) of the line is obtained only by utilizing the actual power failure information of the power distribution station area, the power failure range is analyzed, and a new thought is provided for analyzing the power failure range of the power distribution network.
Description
Technical Field
The invention belongs to the technical field of power distribution network power failure emergency repair and power supply service, and particularly relates to a power distribution network power failure range analysis method.
Background
With the acceleration of the digital transformation of the power distribution network, more and more sensing devices are widely installed in the power distribution network, and the power distribution network has observability and measurability from the original 'blind area'. However, one distribution line, especially a rural distribution line, is generally long, the number of related circuit breakers, section switches, fuses and station area low-voltage circuit breakers is large, and monitoring equipment is not additionally arranged on all switches or circuit breakers. When a line breaks down, a certain switch is subjected to overcurrent rapid tripping to remove the fault, 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 provided with the monitoring device, the condition that the tripping information is missed or not received may occur after the circuit breaker (or switch) is tripped, and the conventional method for identifying the power failure range through the switch tripping fails.
Therefore, a power distribution network power failure range analysis method needs to be designed at the present stage to solve the above problems.
Disclosure of Invention
The invention aims to provide a power distribution network power failure range analysis method, which is used for solving the technical problems in the prior art, such as: the traditional power distribution network power failure range is identified according to switch trip information and a network topological relation, however, monitoring equipment is not additionally arranged on all switches in the power distribution network, meanwhile, information is not reported in the outdoor switch monitoring equipment, and the traditional method cannot analyze and identify the power failure range when the traditional method meets the above conditions.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a power distribution network power failure 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 switch tripping information exists, the power distribution network power failure range is directly generated according to the topological connection relation of the power distribution network, and if no switch tripping information exists, the step 2 is skipped;
and 2, step: starting power failure range recognition according to the power failure information of the transformer area, firstly determining a specifically analyzed line by utilizing the hooking relation between the line and the transformer area, and collecting the power failure information conditions of all the transformer areas under the line at the same time;
and step 3: according to the mapping table of the tripping information of the circuit breaker and the power loss information of the transformer substation, comparing the actually received power loss information of the transformer substation to calculate the tripping probability of different circuit breakers;
and 4, step 4: selecting a breaker with the maximum 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 power distribution automation master station, and the monitoring equipment is a power distribution network outgoing line breaker protection device, a power distribution automation terminal, a station area intelligent fusion terminal and a station area intelligent leakage protection device.
Further, before the step 1 is carried out, the distribution automation master station acquires a distribution network line topological relation from a production management system to form a basic database of a breaker tripping and distribution area power loss information mapping table;
the tripping information comes from a power distribution network outgoing line breaker protection device and a power distribution automation terminal which are installed on site, and the station area power loss information comes from the station area intelligent fusion terminal and the station area intelligent leakage protection device and is transmitted to the power distribution automation main station in real time.
Furthermore, before step 2 is executed, the distribution automation master station needs to meet the condition that only the power loss information of the distribution area is received at the same time period and no trip information of a breaker exists on a circuit connected with the distribution area, and the power failure range starting analysis and identification are realized in the distribution automation master station.
Further, in step 3, the mapping table of the trip information and the power loss information of the circuit breaker in the transformer area is obtained in the following manner:
firstly, acquiring corresponding relations between a circuit breaker and an upstream and a downstream of a transformer area according to a power supply side by a topological connection relation of a power distribution network;
when the breaker trips, the power loss information of the station area at the downstream of the breaker is necessary and is represented by '1'; no power loss information exists in an upstream or other station areas, and the information is represented by '0', so that a mapping matrix A is obtained;
wherein M represents the number of circuit breakers on the distribution network line, N represents the number of transformer areas hung on the distribution network line, AMNRepresenting the trip of the Mth breaker, and the existence of the power loss information of the Nth station area.
Further, in step 3, the actually received power loss information of the transformer area is used for comparing and calculating the tripping probability of different circuit breakers, and the method comprises the following steps:
1) obtaining a power loss information matrix B according to a power loss information table of the distribution area actually received by the power distribution automation master station;
B＝[B11 B12…B1N]
wherein, B1NRepresenting the power loss information of the Nth transformer area, wherein the power loss information is 1 if the power loss information is available, and is 0 if the power loss information is not available;
2) comparing each line of data of the power-off information matrix B with the same line of data in different rows of the mapping matrix A to obtain a matrix C;
wherein, CMNRepresents B1NAnd AMNWhen B is a value obtained by comparison of the values of (A)1NAnd AMNTaking 1 when the data are the same, and taking 0 when the data are different;
3) obtaining the tripping probability of different circuit breakers by using the matrix C, and calculating the formula as follows;
wherein: i represents the ith breaker, i ═ 1,2, M, and N represents the nth block.
Further, in step 4, the circuit breaker with the highest trip probability is the slave PiSelecting; probability of tripping P if there are multiple switchesiIf the tripping probabilities calculated by the two switches are the same, the tripping of the section switch is preferentially used for judging the power failure range of the power distribution network.
Compared with the prior art, the invention has the beneficial effects that:
the power distribution network switch monitoring system has the beneficial effect that the problem that the power failure range cannot be effectively analyzed and identified by using a traditional method when the power distribution network switch is not additionally provided with monitoring equipment or information of the switch monitoring equipment arranged outdoors is not reported is effectively solved. According to the method for analyzing the power failure range of the power distribution network, the probability of tripping of different circuit breakers (or switches) of the line is obtained only by utilizing the actual power failure information of the power distribution station area, the power failure range is analyzed, and a new thought is provided for analyzing the power failure range of the power distribution network.
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Fig. 1 is a schematic view of a process flow diagram according to an embodiment of the present application.
Fig. 2 is a schematic diagram of an exemplary power distribution network structure according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. It is noted that relational terms such as "first" and "second," and the like, may be 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.
Furthermore, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example (b):
a distribution line is generally longer, especially rural distribution line, and the circuit breaker, section switch, fuse, the platform district low voltage circuit breaker that relate to are more, and not all switches or circuit breaker have installed monitoring facilities additional. When a line breaks down, a certain switch is subjected to overcurrent rapid tripping to remove the fault, 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 provided with the monitoring device, the condition that the tripping information is missed or not received may occur after the circuit breaker (or switch) is tripped, and the conventional method for identifying the power failure range through the switch tripping fails.
As shown in fig. 1, a method for analyzing the power outage range of a power distribution network is provided, which includes the following steps:
step 1: and (3) after the power distribution network breaks down, the monitoring background analyzes various information sent by the monitoring equipment, if switching trip information exists, the power distribution network power failure range is directly generated according to the topological connection relation of the power distribution network, and if the switching trip information does not exist, the step 2 is skipped.
Step 2: and starting power failure range identification according to the power failure information of the transformer area, determining a specifically analyzed line by using the hooking relation between the line and the transformer area, and collecting the power failure information conditions of all the transformer areas under the line at the same time.
And step 3: according to the mapping table of the trip information of the circuit breaker (or the switch) and the power loss information of the transformer area, the actually received power loss information of the transformer area is utilized to compare and calculate the trip probability of different circuit breakers (switches).
And 4, step 4: and selecting the breaker (switch) with the maximum trip probability under the line, and generating the 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 distribution area intelligent fusion terminal and a distribution area intelligent leakage protection device.
Further, before the step 1, the distribution automation master station acquires a distribution network line topological relation from a Production Management System (PMS) to form a basic database of a mapping table of breaker (or switch) tripping and station area power loss information.
The switch tripping information comes from a power distribution network outgoing line breaker protection device and a power distribution automation terminal which are installed on site, the transformer area power loss information comes from a transformer area intelligent fusion terminal and a transformer area intelligent leakage protection device, and the information of the devices can be transmitted to a power distribution automation main station in real time.
Furthermore, before step 2 is executed, the 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 no trip information of a breaker (or a switch) exists on a circuit connected with the transformer area, and the power failure range starting analysis and identification are realized in the distribution automation master station.
Further, the mapping table of the trip information and the power loss information of the power breaker (or switch) in the step 3 is obtained by the following method:
firstly, the topological connection relation of the power distribution network is used for obtaining the corresponding relation between a breaker (or a switch) and the upstream and downstream of a transformer area according to the power supply side.
When the breaker (or switch) is tripped, the power loss information of the station zone at the downstream of the breaker (or switch) is necessary, and is represented by '1'; the upstream or other station areas have no power loss information, indicated by "0", resulting in 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, and AMNRepresenting that the Mth breaker (or switch) is tripped and the Nth station area has power loss information.
Further, the step 3 of comparing the actually received power loss information of the transformer area to calculate the tripping probability of different circuit breakers (switches) comprises the following steps.
1) And obtaining a power loss information matrix B according to the power loss information table of the distribution area actually received by the power distribution automation master station.
B＝[B11 B12…B1N]
Wherein, B1NThe power loss information of the nth station area is 1 in some cases and 0 in other cases.
2) And comparing each column of data of the power-off information matrix B with the same column of data in different rows of the mapping matrix A to obtain a matrix C.
Wherein, CMNRepresents B1NAnd AMNWhen B is a value obtained by comparison of the values of (A)1NAnd AMNWhen the data are the same, "1" is taken, and when the data are different, "0" is taken.
3) The tripping probability of different circuit breakers (or switches) is obtained by using the matrix C, and the formula is calculated as follows.
Wherein: i represents the ith circuit breaker (or switch), i ═ 1,2.., M ], and N represents the nth block.
Further, in step 4, the circuit breaker (switch) with the highest trip probability is the slave PiAnd (4) selecting. Probability of tripping P if there are several switchesiIf the tripping probabilities calculated by the two switches are the same, the tripping of the section switch is preferentially used for judging the power failure range of the power distribution network.
Case analysis:
as shown in fig. 2, a simple distribution network is proposed, which is composed of a feeder and a plurality of branch lines, where STA is a substation, S1 denotes a substation outgoing switch, S4 and S8 denote section switches on the feeder, S2, S3, S5, S6, S7, S9 and S10 are drop-out fuses, D1 to D7 are leakage protection devices corresponding to 7 transformer areas, and T1 to T7 are distribution transformers. As described above, fig. 2 shows that M parameter is 10 and N parameter is 7 in mapping matrix a, so that a mapping matrix a with dimension of 10 × 7 can be generated:
when a short-circuit fault occurs in an area between the switch S1 and the switch S2 in fig. 2, under a normal condition, the distribution automation master station should receive power loss information of the distribution areas 3 to 7, and if one item of actually received power loss information of the distribution areas is missing, the power loss information matrix B1 is:
B1＝[0 0 1 0 1 1 1]
according to the matrix B1, it can be seen that the station zone 4 does not receive power transmission and loss information, and the matrix B1 is compared with the mapping matrix A, so that the matrix C1 is obtained as follows:
the probability of tripping of the 15 switches in fig. 2 can be calculated separately from the matrix C1, as shown in the following table:
TABLE 1 calculation of switch trip probability
As can be seen from the data in the table, the probability of the S4 switch tripping is the largest, and the power failure range from the station zone 3 to the station zone 7 can be analyzed according to the network connection relationship by the position of the S4 switch.
If the distribution area power loss information actually received by the distribution automation master station has two items of loss (the probability of occurrence of the situation is extremely small), the power loss information matrix B2 is:
B2＝[0 0 1 0 1 0 1]
according to the matrix B2, it can be seen that the power transmission and loss information does not exist in the station areas 4 and 6, and the matrix B2 is compared with the mapping matrix A, so that the matrix C2 is obtained as follows:
the probability of tripping of the 15 switches in fig. 2 can be calculated separately from the matrix C2, as shown in the following table:
TABLE 2 calculation of switch trip probability
As can be seen from the data in the table, the probability of tripping of the switches S4, S5, S7 and S10 is the largest and equal, but it should be noted that all of S5, S7 and S10 are drop-type fuses, and the probability of tripping 3 drop-type fuses at the same time (i.e. multiple short-circuit faults simultaneously exist on the large feeder line) is very small, so that the probability of tripping the S4 sectional switch is considered to be the largest, and the power outage range can be analyzed to be from the station zone 3 to the station zone 7 according to the network connection relationship.
Therefore, the method can be used for effectively solving the problem that the power failure range cannot be effectively analyzed and identified by using the traditional method when the monitoring equipment is not additionally arranged on the switch of the power distribution network or the information of the switch monitoring equipment arranged outdoors is not reported. According to the method for analyzing the power failure range of the power distribution network, provided by the invention, the probability of tripping of different circuit breakers (or switches) of the line is obtained only by utilizing the actual power failure information of the power distribution station area, the power failure range is analyzed, and a new thought is provided for analyzing the power failure range of the power distribution network.
The above are preferred embodiments of the present invention, and all changes made according to the technical solutions of the present invention that produce functional effects do not exceed the scope of the technical solutions of the present invention belong to the protection scope of the present invention.
Claims (6)
1. A power distribution network power failure range analysis method is characterized by comprising the following steps:
step 1: after the power distribution network fails, the monitoring background analyzes various information sent by the monitoring equipment, if switch tripping information exists, the power distribution network power failure range is directly generated according to the topological connection relation of the power distribution network, and if no switch tripping information exists, the step 2 is skipped;
step 2: starting power failure range recognition according to the power failure information of the transformer area, firstly determining a specifically analyzed line by utilizing the hooking relation between the line and the transformer area, and collecting the power failure information conditions of all the transformer areas under the line at the same time;
and step 3: according to the mapping table of the trip information of the circuit breaker and the power loss information of the transformer substation, the actually received power loss information of the transformer substation is utilized to compare and calculate the trip probability of different circuit breakers;
and 4, step 4: selecting a breaker with the maximum 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 power distribution automation master station, and the monitoring equipment is a power distribution network outgoing line breaker protection device, a power distribution automation terminal, a station area intelligent fusion terminal and a station area intelligent leakage protection device.
2. The method for analyzing the power failure range of the power distribution network according to claim 1, wherein before the step 1 is carried out, the distribution automation master station first obtains the topological relation of the distribution network lines from a production management system to form a basic database of a mapping table of breaker tripping and station area power failure information;
the tripping information comes from a power distribution network outgoing line breaker protection device and a power distribution automation terminal which are installed on site, and the station area power loss information comes from the station area intelligent fusion terminal and the station area intelligent leakage protection device and is transmitted to the power distribution automation main station in real time.
3. The method for analyzing the power failure range of the power distribution network as claimed in claim 2, wherein before step 2 is executed, the distribution automation master station needs to meet the condition that only power loss information of a distribution area is received in the same time period and no trip information of a breaker exists on a line connected with the distribution area, and the power failure range starting analysis and identification are realized in the distribution automation master station.
4. The method for analyzing the blackout range of the power distribution network as claimed in claim 3, wherein the mapping table of breaker trip and distribution area blackout information in step 3 is obtained by:
firstly, obtaining the corresponding relation between a circuit breaker and the upstream and downstream of a transformer area according to the topological connection relation of a power distribution network and the power supply side;
when the breaker trips, the power loss information of the station area at the downstream of the breaker is necessary and is represented by '1'; no power loss information exists in an upstream or other station areas, and the information is represented by '0', so that a mapping matrix A is obtained;
wherein M represents the number of circuit breakers on the distribution network line, N represents the number of transformer areas hung on the distribution network line, AMNRepresenting that the Mth breaker trips, and the Nth station area has power loss information.
5. The method for analyzing the power failure range of the power distribution network as claimed in claim 4, wherein in the step 3, the probability of tripping of different circuit breakers is calculated by comparing the actually received power failure information of the distribution area, and the method comprises the following steps:
1) obtaining a power loss information matrix B according to a power loss information table of the distribution area actually received by the power distribution automation master station;
B＝[B11 B12…B1N]
wherein, B1NRepresenting the power loss information of the Nth transformer area, wherein the power loss information is 1 if the power loss information is available, and is 0 if the power loss information is not available;
2) comparing each line of data of the power-off information matrix B with the same line of data in different rows of the mapping matrix A to obtain a matrix C;
wherein, CMNRepresents B1NAnd AMNWhen B is a value obtained by comparison of the values of (A)1NAnd AMNTaking 1 when the data are the same, and taking 0 when the data are different;
3) obtaining the tripping probability of different circuit breakers by using the matrix C, and calculating the formula as follows;
wherein: i represents the ith breaker, i ═ 1,2, M, and N represents the nth block.
6. The method for analyzing the blackout range of the power distribution network as claimed in claim 1, wherein in the step 4, the circuit breaker with the highest trip probability is selected from PiSelecting; probability of tripping P if there are multiple switchesiIf the tripping probabilities calculated by the two switches are the same, the tripping of the section switch is preferentially used for judging the power failure range of the power distribution network.
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