Substation damage assessment system and method based on power loss in the station after switch tampering

Abstract

The present application discloses a substation damage assessment system and method based on power outages in the station after switch tampering. The system includes: a partition numbering module, a tampering simulation module and a damage assessment module; the partition numbering module is used to virtually partition the substation and number the electrical equipment; the tampering simulation module is used to simulate different damage scenarios of the substation; the damage assessment module is used to assess the damage situation based on the damage scenario. The present application narrows the analysis scope of substation damage assessment, and makes the damage assessment more concrete through a single switch or circuit breaker tampering method; it increases the scenarios of damage assessment, and is no longer limited to a single condition or large-scale switch or circuit breaker tampering method, so that the strike and post-strike recovery in the actual application process have a basis to rely on and the effectiveness is more significant.

Description

Technical Field

[0001] This application belongs to the technical field of substation damage assessment, and specifically relates to a substation damage assessment system and method based on power loss in the substation after switch tampering. Background Art

[0002] With the development of social economy, people's requirements for safe and stable power supply are getting higher and higher. As the core link in the power system, substations play an irreplaceable role. Under the background of the rapid development of modern communication and information technology, in order to ensure the safe and economic operation of the large power grid, the substation integrated automation system has become increasingly perfect and widely used, and the safety zoning management of substations is also constantly evolving. Various substation vulnerability problems have followed. Therefore, the problem to be solved in this application is to study the damage assessment model when the switches in the substation are affected. Summary of the Invention

[0003] This application aims to solve the deficiencies of the existing technology, and proposes a substation damage assessment system and method based on power loss in the substation after switch tampering. By introducing the substation zoning mechanism, the substation is physically and network partitioned, and through the analysis of different scenarios, the damage effect assessment under single or multiple ways of tampering with switches or circuit breakers is realized.

[0004] To achieve the above object, this application provides the following solutions:

[0005] A substation damage assessment system based on power loss in the substation after switch tampering, comprising: a zoning numbering module, a tampering simulation module, and a damage assessment module;

[0006] The zoning numbering module is used to virtually partition the substation and number the electrical equipment;

[0007] The tampering simulation module is used to simulate different damage scenarios of the substation;

[0008] The damage assessment module is used to assess the damage situation based on the damage scenario.

[0009] Preferably, the zoning numbering module includes: a zoning unit and a numbering unit;

[0010] The zoning unit is used to virtually partition a typical substation;

[0011] The numbering unit is used to number the electrical equipment of the substation after zoning.

[0012] Preferably, the working process of the tampering simulation module includes: based on the virtual partition and the numbering, simulating the tampering of different circuit breakers of the substation to obtain different damage scenarios.

[0013] Preferably, the workflow of the damage assessment module includes:

[0014] Analyze the impact of different damage scenarios on electrical equipment and build a substation loss coefficient model;

[0015] The substation loss coefficient model is used to evaluate the damage of the substation.

[0016] The present application also provides a substation damage assessment method based on power outage in the station after switch tampering, comprising the following steps:

[0017] Virtually partition the substation and number the electrical equipment;

[0018] Simulate different damage scenarios of substations;

[0019] A damage situation assessment is performed based on the damage scenario.

[0020] Preferably, the simulation method of different damage scenarios includes: based on the virtual partitions and the numbers, simulating tampering of different circuit breakers of the substation to obtain different damage scenarios.

[0021] Preferably, the damage assessment method comprises:

[0022] Analyze the impact of different damage scenarios on electrical equipment and build a substation loss coefficient model;

[0023] The substation loss coefficient model is used to evaluate the damage of the substation.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] This application narrows the analysis scope of substation damage assessment and makes the damage assessment more concrete by tampering with a single switch or circuit breaker. It increases the scenarios of damage assessment and is no longer limited to a single condition or large-scale switch or circuit breaker tampering, making the strike and post-strike recovery in actual application more reliable and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic diagram of the system structure of an embodiment of the present application;

[0028] Figure 2 This is the simplified main wiring diagram of the substation for the embodiment of this application;

[0029] Figure 3 This is the schematic diagram of the method flow for the embodiment of this application. Specific embodiments

[0030] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0031] To make the above objects, features, and advantages of this application more obvious and understandable, the following further detailed description of this application will be given in conjunction with the accompanying drawings and specific embodiments.

[0032] Embodiment 1

[0033] In this embodiment, as Figure 1 shown, the substation damage assessment system based on the power loss in the station after the switch is tampered with includes: a partition numbering module, a tampering simulation module, and a damage assessment module;

[0034] The partition numbering module is used to virtually partition the substation and number the electrical equipment. The partition numbering module includes: a partitioning unit and a numbering unit; the partitioning unit is used to virtually partition a typical substation; the numbering unit is used to number the electrical equipment in the substation after partitioning.

[0035] In this embodiment, the partitioning unit virtually partitions a typical substation based on this figure. Usually, the primary and secondary equipment in the station is presented in different areas. The primary equipment such as transformers, buses, circuit breakers, disconnectors, reactors, voltage / current transformers, etc. are often arranged in the outdoor area of the station; the secondary equipment such as relay protection and monitoring devices, measuring and metering instruments, signal lights, transfer and control switches, contactors, small low-voltage circuit breakers, fuses, etc. are usually arranged in the form of switchboards in the factory station room to control and monitor the outdoor primary equipment. The numbering unit numbers the circuit breakers and main transformers, numbering them in sequence from high voltage level to low voltage level. The circuit breaker numbers are set as 1XX1 - 1X56, and the main transformer numbers are set as #1 - #6. The high-voltage side includes four incoming lines A, B, C, D of the factory station and three standby lines. The 110kV includes two outgoing lines and the in-station transformer 35kV. The 35kV low-voltage side contains six outgoing lines. The simplified main wiring diagram of the typical substation after partitioning and numbering is as Figure 2 shown.

[0036] The tampering simulation module is used to simulate different damage scenarios of the substation. The working process of the tampering simulation module includes: based on virtual partitioning and numbering, simulating the tampering of different circuit breakers in the substation to obtain different damage scenarios.

[0037] In this embodiment, multiple scenarios are set, and virtual tampering attacks are carried out on the circuit breakers in the station, such as Figure 2 shown.

[0038] Scenario 1: Taking incoming line A TSLIN as an example, the high-voltage side circuit breakers of the two incoming lines are divided into three damage areas. Area ① contains 1 XX1 circuit breaker, Area ② contains 1 XX2 circuit breaker, and Area ③ contains 1 XX3 circuit breaker.

[0039] Suppose in damage area ①, tamper with the 1 XX1 circuit breaker. Since the 3 / 2 wiring method is adopted on the high-voltage side of the substation, there is no impact on the whole line; in damage area ②, tamper with the 1 XX2 circuit breaker, and incoming line A TSLIN is completely de-energized, affecting the #1 main transformer; in damage area ③, tamper with the 1 XX3 circuit breaker, which has the same effect as the strike area ① and also has no impact on the whole line; the damage area division and damage effects for other high-voltage side incoming lines are the same as the above method and the resulting impacts (in the case where a single or multiple incoming lines are severely affected and completely de-energized, the standby line is enabled, and special cases need to be considered at this time).

[0040] Scenario 2: Taking incoming line A TSLIN as an example, tamper with the 1X22 circuit breaker. Since this circuit breaker is directly connected to the #1 main transformer, incoming line A TSLIN is directly completely de-energized after being damaged. Tampering with the 1X23, 1X24, and 1X25 circuit breakers has the same effect as the above method.

[0041] Scenario 3: Taking the 110 kV double busbars on the medium-voltage side as an example, tamper with the 1X26 - 1X35 circuit breakers, then outgoing lines P a 、P b 、S out3 、S out4 are completely de-energized, affecting the #5 and #6 main transformers, and the functions of this substation fail.

[0042] Scenario 4: Taking the 110 kV double busbars on the medium-voltage side as an example, tamper with the 1X36 and 1X37 circuit breakers, then outgoing lines P a 、P b are completely de-energized.

[0043] Scenario 5: Tampering with the 1X38 - 1X43 circuit breakers directly affects the #5 and #6 main transformers, and the 35 kV side busbars and lines in the station completely fail.

[0044] Scenario 6: Taking the 35kV double busbars on the low-voltage side as an example, if circuit breakers numbered 1X44 - 1X56 are tampered with, all 35kV outgoing lines will be completely de-energized.

[0045] The damage assessment module is used to evaluate the damage situation based on the damage scenario.

[0046] The working process of the damage assessment module includes: analyzing the impact on electrical equipment in different damage scenarios and constructing a substation loss coefficient model; using the substation loss coefficient model to evaluate the damage situation of the substation.

[0047] In this embodiment, a substation loss coefficient model is established, where the model includes the main transformer impact loss coefficient η i and the line impact loss coefficient η j , and the internal impact and loss coefficients of the substation under different damage scenarios are shown in Table 1.

[0048] Table 1

[0049]

[0050] In this embodiment, the meaning expressed by the defined substation loss coefficient η i，j is the substation load shedding rate, and it is discussed in the following multiple situations:

[0051] (1) Scenario 1: Generally, when one or more incoming line circuit breakers fail and cause the complete power outage of that line, the load will be transferred to the remaining incoming lines or standby lines, then 0 ≤ η i，j < 1, that is, it is considered that the substation can still operate normally or partially normally; when switches numbered 1XX2, 1XX5, 1XX8, 1XX11, 1XX14, 1XX17, 1XX20 on the 220kV high-voltage side are all tampered with and disconnected, then η i，j = 1, that is, it is considered that the substation is completely paralyzed;

[0052] (2) Scenario 2: When switch 1X22 is disconnected, the impact on the substation is the same as when switch 1XX2 in Scenario 1 is disconnected, and the load can be adjusted and transferred to other lines, then 0 ≤ η i，j < 1, that is, it is considered that the substation can still operate normally or partially normally; when switches numbered 1X22 - 1X25 are all tampered with and disconnected, then η i，j = 1, that is, it is considered that the substation is completely paralyzed;

[0053] (3) Scenario 3: When switches numbered 1X26 - 1X35 are tampered with and disconnected, the 110kV medium-voltage side line fails, then η i，j = 1, that is, it is considered that the substation is completely paralyzed;

[0054] (4)Scenario 4: When switch No. 1X36 or 1X37 is tampered with and disconnected, all the outgoing lines from the 110 kV medium-voltage side to the outside of the substation lose power, then 0 < η i，j < 1, which means that the substation is still considered to be operating normally, but the transformation to the outside of the substation fails;

[0055] (5)Scenario 5: When switch No. 1X38 or 1X39 is tampered with and disconnected, it directly affects the #5 and #6 main transformers, and the 110 kV to 35 kV transformation completely fails; when switches No. 1X40 - 1X43 are all tampered with and disconnected, it directly affects the incoming line on the 35 kV low-voltage side. Combining the above two situations, we get 0 < η i，j < 1, which means that the substation is not completely incapacitated and can still achieve the transformation from the external high-voltage station or low-voltage power plant to 220 kV, from 220 kV to 110 kV, and from 110 kV to the outside substation;

[0056] (6)Scenario 6: When switches No. 1X44 - 1X56 are tampered with and disconnected, the 35 kV low-voltage side line fails, directly affecting the outgoing line on the low-voltage side, and the high-voltage side and the medium-voltage side are not affected. This situation is the same as the damage situation in Scenario 5, so 0 < η i，j < 1, which means that the substation is not completely paralyzed and can still achieve the transformation from the external high-voltage station or low-voltage power plant to 220 kV, from 220 kV to 110 kV, and from 110 kV to the outside substation.

[0057] Specifically, in Scenarios 1, 2, 3, and 5, the main transformers are all affected. Therefore, the damage situation of the substation is directly reflected by the load loss rate of the transformer. The calculation of the load loss rate of the transformer is as follows: First, the main transformers of different voltage levels are distinguished as the first-level main transformers (#1 - #4) and the second-level main transformers (#5, #6). Taking the first-level main transformer as an example, assume that the load rate of a single first-level main transformer in the substation is β, and there are n first-level main transformers in the substation. When one or more main transformers fail and become paralyzed, part of the load will be transferred to the remaining main transformers. Suppose m main transformers are paralyzed due to damage, then the load loss rate of the substation can be obtained as:

[0058]

[0059] Secondly, for the tampering of the outgoing line circuit breakers in the substation, such as the affected situations of switches 1X36 - 1X37, 1X44 - 1X56 (excluding 1X47 - 1X50), they all correspond to single outgoing lines. Taking the 35 kV outgoing line as an example, assume that the capacity of the second-level main transformer in this substation is x kVA, there are h second-level main transformers, the number of outgoing lines is k, and the load of any one outgoing line is y τ KW, and the number of paralyzed lines is g. Then the load loss rate of the substation can be obtained as:

[0060]

[0061] Embodiment 2

[0062] In this embodiment, as Figure 3 shown, the substation damage assessment method based on the power loss in the station after switch tampering includes the following steps:

[0063] S1. Virtually partition the substation and number the electrical equipment.

[0064] S2. Simulate different damage scenarios of the substation.

[0065] The simulation method for different damage scenarios includes: based on the virtual partition and numbering, simulate the tampering of different circuit breakers in the substation to obtain different damage scenarios.

[0066] S3. Evaluate the damage situation based on the damage scenario.

[0067] The method for evaluating the damage situation includes: analyzing the impact on electrical equipment in different damage scenarios, constructing a substation loss coefficient model; using the substation loss coefficient model to evaluate the damage situation of the substation.

[0068] The above-described embodiments are only descriptions of the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present application shall fall within the protection scope determined by the claims of the present application.

Claims

1. A substation damage assessment system based on the loss of power within the station after switch tampering, characterized in that, Including: A partition numbering module, a tampering simulation module, and a damage assessment module; The partition numbering module is used to virtually partition a substation and number electrical equipment; The tampering simulation module is used to simulate different damage scenarios of the substation; The damage assessment module is used to assess the damage situation based on the damage scenario; The working process of the damage assessment module includes: Analyzing the impact on electrical equipment in different damage scenarios and constructing a substation loss coefficient model; Using the substation loss coefficient model to evaluate the damage situation of the substation; Specifically, the damage assessment module directly reflects the damage situation of the substation through the transformer load loss rate. The calculation of the transformer load loss rate is as follows: Distinguish the main transformers of different voltage levels as primary main transformers and secondary main transformers respectively. The load rate of a single primary main transformer is β, and there are n primary main transformers in the substation. When m main transformers fail and are paralyzed, the load loss rate of the substation is obtained as: When the circuit breaker for outgoing lines within the substation is tampered with, and the capacity of the secondary main transformer is x kVA, there are h secondary main transformers, k outgoing lines, and the load of any one outgoing line is y τ KW, and the number of paralyzed lines is g, then the load loss rate of the substation is obtained as follows: 。 2. The substation damage assessment system based on the loss of power within the station after switch tampering according to claim 1, wherein, The partition numbering module includes: a partitioning unit and a numbering unit; The partitioning unit is used to virtually partition a typical substation; The numbering unit is used to number the electrical equipment of the partitioned substation.

3. The substation damage assessment system based on the loss of power within the station after switch tampering according to claim 1, characterized in that, The working process of the tampering simulation module includes: Based on the virtual partition and the numbering, simulating and tampering with different circuit breakers of the substation to obtain different damage scenarios.

4. A substation damage assessment method based on the loss of power within the station after switch tampering, characterized in that, Including the following steps: Virtually partitioning a substation and numbering electrical equipment; Simulating different damage scenarios of the substation; Assessing the damage situation based on the damage scenario; The method for assessing the damage situation includes: Analyzing the impact on electrical equipment in different damage scenarios and constructing a substation loss coefficient model; Using the substation loss coefficient model to evaluate the damage situation of the substation; Specifically, the damage situation of the substation is directly reflected through the transformer load loss rate. The calculation of the transformer load loss rate is as follows: First, distinguish the main transformers of different voltage levels as primary main transformers and secondary main transformers respectively. The load rate of a single primary main transformer is β, and there are n primary main transformers in the substation. When m main transformers fail and are paralyzed, the load loss rate of the substation is obtained as: When the circuit breaker for outgoing lines within the substation is tampered with, the capacity of the secondary main transformer is x kVA, there are h secondary main transformers, there are k outgoing lines, and the load of any one outgoing line is y τ KW, and the number of paralyzed lines is g, then the load loss rate of the substation can be obtained as follows: 。 5. The substation damage assessment method based on the loss of power within the station after switch tampering according to claim 4, wherein, The simulation method for different damage scenarios includes: Based on the virtual partition and the numbering, simulating and tampering with different circuit breakers of the substation to obtain different damage scenarios.

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