Method and device for realizing load batch control and electronic equipment

Abstract

The invention discloses a method and a device for realizing load batch control and electronic equipment, and relates to the field of power grid safety control strategies, and the key points of the technical scheme are as follows: inputting parameter information of an operable power transmission line in an SCADA (Supervisory Control and Data Acquisition) system according to an accident power limiting sequence table; establishing a real-time topological relation of the operable power transmission line in the SCADA system according to the parameter information; wherein the real-time topological relation is used for describing the affiliation relation of the switch; when it is detected that the power grid breaks down, the load gap amount of the whole grid and / or all power transmission and transformation sections and the executable load amount of the whole grid and / or all power transmission and transformation sections are determined according to an SCADA system; generating a control strategy of load batch control according to the load gap amount and the executable load amount in combination with the turn information of the accident power limiting sequence table and the real-time topological relation of the operable power transmission line; and realizing load batch control of the whole network and / or each power transmission and transformation section according to the control strategy.

Description

Technical Field

[0001] The present invention relates to the field of power grid security control strategies, and more specifically, to a method, a device and an electronic device for realizing load batch control. Background Art

[0002] In an emergency, the power grid may experience frequency drop, equipment overload, etc. If it cannot be dealt with quickly, it may cause the power grid to collapse. To ensure the safety of the power grid, the power grid dispatching department must issue emergency power restriction orders in a timely manner according to the plan. Among them, load batch control is the last line of defense to ensure the safety of the power grid.

[0003] The existing load batch control method adopts "pre-entry of accident plans and execution of accident plans during the event", but there are more significant drawbacks. First, personnel are required to enter the controlled feeder switches into the system one by one in advance according to the plan, and the control plan generated by this process takes a lot of time; secondly, after the power grid operation mode changes, maintenance personnel must manually adjust and enter the feeder switches according to the power grid operation mode, and then modify the control strategy, resulting in poor real-time performance; finally, the accident plan must be entered into the system in advance. Once an accident occurs without a plan, the system will not be able to perform batch control.

[0004] Therefore, how to achieve fast, accurate and real-time load batch control of 10kV feeder switches to avoid indiscriminate disconnection of important, high-risk and sensitive users in the event of a power grid failure, thereby minimizing the impact of power rationing caused by accidents. Summary of the invention

[0005] The purpose of the present invention is to provide a method, device and electronic equipment for realizing load batch control, so as to solve the problem that the prior art cannot quickly, accurately and real-time complete the load batch control of 10kV feeder switch.

[0006] In a first aspect of the present application, a method for implementing load batch control is provided, the method comprising:

[0007] Entering parameter information of operable transmission lines in the SCADA system according to the accident power restriction priority table, and establishing a real-time topological relationship of the operable transmission lines in the SCADA system according to the parameter information; wherein the real-time topological relationship is used to describe the subordinate relationship of the switches;

[0008] When a power grid fault is detected, the load shortfall of the entire network and / or each power transmission and transformation section, as well as the executable load of the entire network and / or each power transmission and transformation section, are determined according to the SCADA system;

[0009] Based on the load gap and executable load, combined with the round information of the accident power restriction priority table and the real-time topological relationship of the operable transmission lines, a control strategy for load batch control is generated;

[0010] According to the control strategy, batch control of loads in the entire network and / or each transmission and transformation section is achieved.

[0011] In one implementation, the parameter information includes one or more of the dual name, round, sequence, load type, affiliated unit, and security load of the transmission line.

[0012] In one implementation, a real-time topological relationship of operable transmission lines is established, specifically:

[0013] Take any 10kV feeder switch included in the accident power restriction priority list of the substation as the charge starting point, control the charge starting point to migrate on the main transformer, transmission line and busbar until it encounters the 220kV side switch of the 500kV main transformer or the disconnected switch, and use all the power equipment passed by the charge starting point during the migration process as the free pool of any 10kV feeder switch;

[0014] According to the 10kV feeder switch in the free pool, the 220kV switch of the 500kV main transformer is preset as the one-way main isolation pool, the 220kV line switch of the transmission section is the one-way auxiliary isolation pool, and the 220kV side switch of the 220kV main transformer is the one-way sub-isolation pool;

[0015] The topological relationship of the 10kV feeder switch is verified. When the topological relationship verification result of the 10kV feeder switch is correct, the topological relationship between the unidirectional sub-isolation pool and the unidirectional auxiliary isolation pool, the topological relationship between the unidirectional sub-isolation pool and the unidirectional main isolation pool, and the topological relationship between the unidirectional auxiliary isolation pool and the unidirectional main isolation pool are established.

[0016] In one implementation, the topological relationship of the 10kV feeder switch is verified, specifically: when any 10kV feeder switch is only in one unidirectional sub-isolation pool, in at least one unidirectional main isolation pool, or in zero or more unidirectional auxiliary isolation pools, the topological relationship of the 10kV feeder switch is verified to be correct.

[0017] In one implementation, establishing a topological relationship between a unidirectional sub-isolation pool and a unidirectional auxiliary isolation pool includes:

[0018] If all feeder switches of any one-way sub-isolation pool are in any one or more one-way auxiliary isolation pools, then any one-way sub-isolation pool is subordinate to any one or more one-way auxiliary isolation pools; wherein, the one-way sub-isolation pool may not belong to any one-way auxiliary isolation pool;

[0019] Establishing a topological relationship between a unidirectional sub-isolation pool and a unidirectional main isolation pool, including: if all feeder switches of any unidirectional sub-isolation pool are in any one or more unidirectional main isolation pools, then any unidirectional sub-isolation pool is subordinate to any one or more unidirectional main isolation pools; wherein, a unidirectional sub-isolation pool belongs to at least one unidirectional main isolation pool;

[0020] A topological relationship between the unidirectional auxiliary isolation pool and the unidirectional main isolation pool is established, including: if all feeder switches of any unidirectional auxiliary isolation pool are in any one or more unidirectional main isolation pools, then any unidirectional auxiliary isolation pool is subordinate to any one or more unidirectional main isolation pools; wherein, the unidirectional auxiliary isolation pool belongs to at least one unidirectional main isolation pool.

[0021] In one implementation, the load gap of the entire network and / or each transmission and transformation section is determined according to the SCADA system, including:

[0022] The difference between the current actual load of the entire network and the load plan value issued by the superior dispatcher is calculated to obtain the load gap of the entire network;

[0023] Determine the active power difference between the 500kV main transformer offline active power, the transmission section active power and the 220kV main transformer offline active power, and calculate the difference between the active power difference and the set rated active power to obtain the load gap of each transmission and transformation section;

[0024] Determine the executable load of the entire network and / or each transmission and transformation section based on the SCADA system, including: carry out control verification of the 10kV feeder switch that can be pulled in the SCADA system, and include the load supplied by the 10kV feeder switch that has passed the verification in the executable load.

[0025] In one implementation, the control verification of the 10kV feeder switch that can be pulled in the SCADA system includes: switch position verification, switch flow verification, basic model verification, protection signal verification, sign verification, pressure plate verification and communication protocol verification.

[0026] In one implementation, a control strategy for load batch control is generated based on the load gap and executable load, combined with the round information of the accident power restriction priority table, including:

[0027] When the whole network is in a state of power shortage, but each transmission and transformation section is not short of power, the executable load of the whole network is distributed according to the proportion of the actual load value of the power supply area round information, until the total amount of distributed load batch control is greater than the load gap of the whole network;

[0028] When the whole network is not short of electricity, but each transmission and transformation section is short of electricity, the load in each transmission and transformation section is transferred to the area without power shortage. If there is still a load gap in each transmission and transformation section after the load transfer, the executable load of each transmission and transformation section is allocated according to the proportion of the actual load value of the round information in the transmission and transformation section according to the topology search result of the real-time topology relationship, until the total amount of allocated load batch control is greater than the load gap of each transmission and transformation section;

[0029] When the whole network is in a state of power shortage and each transmission and transformation section is in a state of power shortage, the load in each transmission and transformation section will be transferred to the area without power shortage. If after the load transfer, only the state of power shortage in the whole network is handled, the operation process when the whole network is in a state of power shortage and each transmission and transformation section is not in a state of power shortage will be executed; if after the load transfer, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the executable load of the whole network will be distributed according to the proportion of the actual load value of the first round in the power supply area. If after the first round of load distribution, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the operation process when the whole network is in a state of power shortage and each transmission and transformation section is in a state of power shortage will be executed; if after the first round of load distribution, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the next round of load distribution will be executed until the total amount of load batch control is greater than the load gap.

[0030] In a second aspect of the present application, a device for implementing load batch control is provided, the device comprising:

[0031] A topology relationship establishment module is used to input parameter information of operable transmission lines in the SCADA system according to the accident power restriction order table, and establish a real-time topology relationship of the operable transmission lines in the SCADA system according to the parameter information; wherein the real-time topology relationship is used to describe the subordinate relationship of the switches;

[0032] A load parameter determination module is used to determine the load gap of the entire network and / or each power transmission and transformation section, and the executable load of the entire network and / or each power transmission and transformation section according to the SCADA system when a power grid fault is detected;

[0033] A control strategy generation module is used to generate a control strategy for load batch control based on the load gap and executable load, combined with the round information of the accident power restriction ranking table and the real-time topological relationship of the operable transmission lines;

[0034] The load control module is used to realize load batch control of the entire network and / or each transmission and transformation section according to the control strategy.

[0035] The third aspect of the present application provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and executable by the processor, wherein when the computer program is executed by the processor, the steps of a method for realizing load batch control as provided in the first aspect of the present application are implemented.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention provides a method for realizing load batch control, which inputs parameter information of operable transmission lines into a SCADA system according to an accident power restriction ranking table, and establishes a real-time topological relationship of the operable transmission lines in the SCADA system according to the parameter information; when a power grid failure is detected, the load gap amount of the entire network and / or each transmission and transformation section, and the executable load amount of the entire network and / or each transmission and transformation section are determined according to the SCADA system; according to the load gap amount and the executable load amount, combined with the round information of the accident power restriction ranking table and the real-time topological relationship of the operable transmission lines, a control strategy for load batch control is generated. The present invention avoids the indiscriminate removal of important, high-risk, and sensitive users in the event of a failure, and minimizes the impact of accident power restriction. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0039] Figure 1 A flow chart of a method for implementing load batch control provided by an embodiment of the present invention;

[0040] Figure 2 A principle block diagram of a device for implementing load batch control provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0042] It should be noted that the terms "include" or "may include" used in various embodiments of the present application indicate the presence of the function, operation or element applied for, and do not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present application, the terms "include", "have" and their cognates are only intended to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items.

[0043] In various embodiments of the present application, the expression "or" or "at least one of B or / and C" includes any combination or all combinations of the words listed at the same time. For example, the expression "B or C" or "at least one of B or / and C" may include B, may include C, or may include both B and C. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0044] The existing load batch control method adopts "pre-entry of accident plans and execution of accident plans during the event", but there are more significant drawbacks. First, personnel are required to enter the controlled feeder switches into the system one by one in advance according to the plan, and the control plan generated by this process takes a lot of time; secondly, after the power grid operation mode changes, maintenance personnel must manually adjust and enter the feeder switches according to the power grid operation mode, and then modify the control strategy, resulting in poor real-time performance; finally, the accident plan must be entered into the system in advance. Once an accident occurs without a plan, the system will not be able to perform batch control.

[0045] Therefore, how to quickly, accurately and in real time complete the load batch control of 10kV feeder switches to avoid indiscriminate disconnection of important, high-risk and sensitive users in the event of a power grid failure, thereby minimizing the impact of power rationing due to accidents, is a technical problem that urgently needs to be solved.

[0046] Therefore, this embodiment provides a method, device and electronic equipment for implementing load batch control, which solves the problem that the related technology cannot quickly, accurately and real-time complete the load control of 10kV switches in large quantities, and provides a load batch control that can realize adaptive topology search, self-generation of strategies, automatic control and orderly recovery, thereby improving the accident handling efficiency of the power grid in emergency situations, avoiding the indiscriminate removal of important, high-risk and sensitive users in fault situations, and minimizing the impact of accident power rationing.

[0047] The following will describe in detail the method for implementing load batch control provided by the present application in conjunction with specific implementation methods. Figure 1 , Figure 1A flow chart of a method for implementing load batch control provided by an embodiment of the present invention is as follows: Figure 1 As shown, the method includes:

[0048] S101, inputting parameter information of operable transmission lines into the SCADA system according to the accident power restriction priority table, and establishing real-time topological relationship of operable transmission lines in the SCADA system according to the parameter information; wherein the real-time topological relationship is used to describe the subordinate relationship of switches.

[0049] In this embodiment, the accident power restriction ranking table is a table for ranking power users for power restriction in order to ensure the safe and stable operation of the power grid in the event of a power grid accident or emergency. The accident power restriction ranking table usually includes the following contents: User classification: According to factors such as the nature and importance of the user's electricity consumption, users are divided into different categories, such as dedicated line users, non-dedicated line users, residential users, public utility users, important and high-risk load users, etc. Power restriction ranking: According to the classification of users and the actual situation of the power grid, the power restriction order of different users is determined. Generally speaking, dedicated line users and non-dedicated line users (excluding residents, public utilities, important and high-risk loads) will be prioritized over residential users, public utility users, important and high-risk load users for power restriction. However, it should be noted that important and high-risk load users usually take special protection measures in the event of a power grid accident to avoid power restriction as much as possible. Load nature: Clarify the load nature of each user, such as pure industrial lines, mixed industrial and commercial lines, lines excluding residential lines, lines involving residential customers, etc., so that the user's electricity demand and impact can be more accurately judged when power is restricted.

[0050] Secondly, the SCADA (Supervisory Control And Data Acquisition) system, or supervisory control system, is a computer-based production process control and dispatching automation system. It can be used in power systems to monitor and control the operation status of power grids, and also includes remote meter reading, fault location, load management and other functions to ensure the stability and safety of power supply.

[0051] The parameter information includes one or more of the dual name, round, sequence, load type, affiliated unit, and security load of the transmission line.

[0052] In some embodiments, a real-time topological relationship of an operable transmission line is established, specifically: any 10kV feeder switch included in the accident power restriction priority table of the substation is used as the charge starting point, and the charge starting point is controlled to migrate on the main transformer, transmission line and busbar until it encounters the 220kV side switch of the 500kV main transformer or a disconnected switch, and all the power equipment passed by the charge starting point during the migration process are used as the free pool of any 10kV feeder switch; according to the 10kV feeder switch in the free pool, a 500kV feeder switch is preset. The 220kV switch of the V main transformer is the unidirectional main isolation pool, the 220kV line switch of the transmission section is the unidirectional auxiliary isolation pool, and the 220kV side switch of the 220kV main transformer is the unidirectional sub-isolation pool; the topological relationship of the 10kV feeder switch is verified, and when the topological relationship verification result of the 10kV feeder switch is correct, the topological relationship between the unidirectional sub-isolation pool and the unidirectional auxiliary isolation pool, the topological relationship between the unidirectional sub-isolation pool and the unidirectional main isolation pool, and the topological relationship between the unidirectional auxiliary isolation pool and the unidirectional main isolation pool are established.

[0053] Specifically, a 10kV feeder switch included in the power limitation priority table of the substation is used as the power connection point, also known as the charge starting point. The charge can migrate freely on the main transformer, transmission line, and busbar until it encounters the 220kV side switch of the 500kV main transformer or a disconnected switch, making it impossible for the charge to migrate freely. All the equipment passed by the charge is its free pool.

[0054] The 220kV switch of the 500kV main transformer is set as a one-way main isolation pool. The charge starting point can only flow in through the 220kV busbar of the 220kV line-500kV substation, and cannot flow in from the 500kV busbar-500kV main transformer 500kV switch. If there are charges from different free pools, the 220kV power grid in the area is set to the same 500kV main transformer area closed loop operation state, and all 10kV switches in the 500kV isolation pool are all 10kV feeder switches contained under the 500kV main transformer.

[0055] The 220kV line switch of the transmission and transformation section is set as a one-way auxiliary isolation pool. The charge flowing into the isolation pool cannot include any 220kV switch of the 500kV main transformer. The 10kV switch corresponding to the charge flowing into the one-way isolation pool is all the 10kV feeder switches in the closed transmission section.

[0056] The 220kV side switch of the 220kV main transformer is set as a one-way sub-isolation pool, and the charge can only flow in through the 110kV busbar of the 110kV line-220kV substation, and cannot flow in from the 220kV switch of the 220kV busbar-220kV main transformer. The switches corresponding to the charges from different free pools in the isolation pool are regarded as all the 10kV feeder switches contained under the 220kV main transformer.

[0057] The topological relationship of the 10kV feeder switch is verified, specifically: when any 10kV feeder switch is only in one unidirectional sub-isolation pool, in at least one unidirectional main isolation pool, or in zero or more unidirectional auxiliary isolation pools, the topological relationship of the 10kV feeder switch is verified correctly.

[0058] Establishing a topological relationship between a unidirectional sub-isolation pool and a unidirectional auxiliary isolation pool, including: if all feeder switches of any unidirectional sub-isolation pool are in any one or more unidirectional auxiliary isolation pools, then any unidirectional sub-isolation pool is subordinate to any one or more unidirectional auxiliary isolation pools; wherein, a unidirectional sub-isolation pool may not belong to any unidirectional auxiliary isolation pool;

[0059] Establishing a topological relationship between a unidirectional sub-isolation pool and a unidirectional main isolation pool, including: if all feeder switches of any unidirectional sub-isolation pool are in any one or more unidirectional main isolation pools, then any unidirectional sub-isolation pool is subordinate to any one or more unidirectional main isolation pools; wherein, a unidirectional sub-isolation pool belongs to at least one unidirectional main isolation pool;

[0060] A topological relationship between the unidirectional auxiliary isolation pool and the unidirectional main isolation pool is established, including: if all feeder switches of any unidirectional auxiliary isolation pool are in any one or more unidirectional main isolation pools, then any unidirectional auxiliary isolation pool is subordinate to any one or more unidirectional main isolation pools; wherein, the unidirectional auxiliary isolation pool belongs to at least one unidirectional main isolation pool.

[0061] Specifically, the following takes the process of establishing a real-time topology for a 10kV Kaohsiung-Michigan line as an example:

[0062] The first step is to enter the account information. The dual name is 110kV Gaoqing Station 10kV Gaojie Line 1 924 switch, the round is the first round, the ranking is the 4th, the load type is Class I (pure industry), the affiliated unit is Chengdu Power Supply Company Chongzhou Power Supply Branch, and the security load is 0.

[0063] The second step is to establish the topological relationship of the unidirectional sub-isolation pool. The 10kV Gaojie Line 1 is used as the starting point of the charge, and the charge migrates upward to the 10kV II bus of the 110kV Gaoqing Station in the real-time system. Since the 10kV segment 912 switch is disconnected, the charge cannot pass through the 10kV segment 912 switch to the 10kV I bus, and can only continue to migrate to the No. 2 main transformer of the 110kV Gaoqing Station and the 110kV II bus of the 110kV Gaoqing Station. Similarly, since the 110kV segment 123 switch is disconnected, the charge cannot pass from the 110kV II bus to the 110kVIII bus, and can only continue to migrate to the 110kV Longqing Line and reach the 110kV II bus of the 220kV Longxing Station. At this time, the 110kV busbar 112 switch of the 220kV Longxing Station is disconnected, and the charge will continue to migrate to the No. 2 main transformer of the 220kV Longxing Station. The No. 2 main transformer 202 switch of the Longxing Station is the one-way sub-isolation pool of the 10kV Gaojie Line. If the 110kV busbar 112 switch of the 220kV Longxing Station is closed at this time, the charge can migrate to the No. 1 and No. 2 main transformers of Longxing, and the combination of the No. 1 and No. 2 main transformers of Longxing Station forms a one-way sub-isolation pool of the 10kV Gaojie Line.

[0064] The third step is to establish the topological relationship of the one-way main isolation pool. After the 10kV Gaojie Line 1 charge reaches the one-way sub-isolation pool of Longxing Station, it cannot pass through the disconnected 220kV Xingdu Line through the 220kV I and II busbars of Longxing Station, and can only reach the 220kV Shuxing Line 1 and 2, Linxing Line 1 and 2, and pass through the 220kV Shuxing Line 1 and 2-Shuzhou Station 220kV busbar, 220kV Linxing Line 1 and 2-Sulin Line 1 and 2-Shusu Line 1 and 2-Shuzhou Station 220kV busbar path, and stop at the 201 and 202 switches of the No. 1 and No. 2 main transformers of Shuzhou Station. The charge belongs to the one-way main isolation pool of the 500kV Shuzhou Station main transformer. This charge will also pass through the Shuzhou 220kV busbar and the operating 220kV Shujia double-circuit and Yujia double-circuit to reach the 201 and 202 switches of the No. 1 and No. 2 main transformers of Yuti Station. Therefore, this charge also belongs to the one-way main isolation pool of the 500kV Yuti Station main transformer.

[0065] The fourth step is to establish the topological relationship of the one-way auxiliary isolation pool. During the period when the 10kV Gaojie Line 1 migrates from the 10kV voltage level to the 220kV switch of the 500kV Shuzhou main transformer, it passes through the 220kV Shuxing Line 1 and 2, Linxing Line 1 and 2, Sulin Line 1 and 2, and Shusu Line 1 and 2. Since the 220kV Shusu Line 1 and 2 + Shuxing Line 1 and 2 have a preset transmission section, the charge also belongs to the one-way auxiliary isolation pool of the 220kV Shusu Line 1 and 2 + Shuxing Line 1 and 2.

[0066] The fifth step is to verify the topological relationship: the 10kV Gaojie line belongs to 1 unidirectional sub-isolation pool, 2 unidirectional main isolation pools, and 1 unidirectional auxiliary isolation pool, which meets the requirements.

[0067] The sixth step is to establish the topological relationship between isolation pools. The 220kV Longxing main transformer unidirectional sub-isolation pool of the 10kV Gaojie Line 1 should belong to the unidirectional main isolation pool of the 500kV Shuzhou main transformer and Yudi main transformer, and the single-phase auxiliary isolation pool of the 220kV Shusu Line 1 and 2 + Shuxing Line 1 and 2 sections; the single-phase auxiliary isolation pool of the 220kV Shusu Line 1 and 2 + Shuxing Line 1 and 2 sections belongs to the unidirectional main isolation pool of the 500kV Shuzhou main transformer and Yudi main transformer.

[0068] S102, when a power grid failure is detected, the load shortfall of the entire network and / or each power transmission and transformation section, and the executable load of the entire network and / or each power transmission and transformation section are determined according to the SCADA system.

[0069] In this embodiment, the current actual load of the entire network is subtracted from the load plan value issued by the superior dispatcher to obtain the load gap of the entire network;

[0070] Determine the active power difference between the 500kV main transformer offline active power, the transmission section active power and the 220kV main transformer offline active power, and calculate the difference between the active power difference and the set rated active power to obtain the load gap of each transmission and transformation section;

[0071] Determine the executable load of the entire network and / or each transmission and transformation section based on the SCADA system, including: carry out control verification of the 10kV feeder switch that can be pulled in the SCADA system, and include the load supplied by the 10kV feeder switch that has passed the verification in the executable load.

[0072] Among them, the 10kV feeder switch control verification that can be pulled in the SCADA system includes: switch position verification, switch flow verification, basic model verification, protection signal verification, sign verification, pressure plate verification and communication protocol verification.

[0073] Specifically, switch position verification: the current telemetering state of the controllable switch must be "closed". Switch flow verification: the telemetering quality code of the controllable switch is "normal", the current current i>=10A and the active power p>=0.15MW. Basic model verification: the control point number of the controllable switch is consistent with the data point number in the remote control definition table. Protection signal verification: the first and second type protection signals of the controllable switch cannot be in the initiating state. The first type protection signal includes the switch accident total, protection action, reclosing action signal, etc.; the second type protection signal includes the switch SF6 low pressure lock, the switch spring is not stored, the switch control circuit is disconnected, etc. Hanging sign verification: the first and second type signals in the controllable switch light sign are hung with light signs such as "out of service", "maintenance", "forbidden to close", etc., then the verification fails. Pressure plate verification: the controllable switch pressure plate should be put into the remote. Communication protocol verification: the controllable switch setting parameter selects the controllable communication protocol. When the default setting is 1, the IEC104 communication protocol is controllable and other protocols are not controllable.

[0074] S103, generating a control strategy for load batch control according to the load gap amount and the executable load amount, combined with the round information of the accident power restriction priority table and the real-time topological relationship of the operable transmission lines.

[0075] In this embodiment, it should be noted that in order to avoid the switch in the strategy library from failing to control the load in the subsequent remote control, the stabilization control system generates a control strategy according to 120% of the issued load. Secondly, there are three control preferences for the control strategy, including the least number of switch operations, the least impact on users, and the highest operational safety benefit. Among them, the control strategy with the least number of switch operations is adopted by default. Among them, the least number of switch operations: sort from large to small according to the current load of the controllable switch. The least impact on users: sort from small to large according to the number of users of the line supplied by the controllable switch. The highest operational safety benefit: automatically search for the controllable switches and current loads included in the overloaded equipment according to the real-time topology of the power grid, and sort the loads of the controllable switches of the same overloaded equipment from high to low until the pre-assessed equipment load rate is reduced to below 95%. The priority between different overloaded equipment is sorted according to the equipment load rate, and the switches belonging to the equipment with a higher equipment load rate are ranked higher.

[0076] Secondly, the round information is explained as follows: the round information includes the first round, the second round, the third round, the fourth round and the fifth round. For example, the first round generally refers to power restriction for pure industrial loads, and the second round generally refers to power restriction for industrial and commercial loads.

[0077] The generated control strategies include the following three cases:

[0078] S1031, when the whole network is in a state of power shortage but each transmission and transformation section is not short of power, the executable load of the whole network is distributed according to the proportion of the actual load value of the power supply area round information until the total amount of distributed load batch control is greater than the load gap of the whole network.

[0079] Specifically, if the entire network is short of electricity and each transmission and transformation section is not short of electricity, the executable amount of the entire network will be allocated in proportion to the actual value of the current first round of load in each district and county. If the load gap of the entire network cannot be met after all the first round of loads are allocated, the actual value of the current second round of loads in each district and county will be allocated in proportion. If the load gap of the entire network cannot be met after all the first and second rounds of loads are allocated, the actual value of the third round of loads will be allocated, and so on, until the fifth round of loads, until the total amount of all allocated load batch control is greater than the load gap of the entire network.

[0080] S1032, when there is no power shortage in the whole network but there is power shortage in each transmission and transformation section, the load in each transmission and transformation section is transferred to the area without power shortage. If there is still a load gap in each transmission and transformation section after the load transfer, the executable load of each transmission and transformation section is allocated according to the ratio of the actual load value of the round information in the transmission and transformation section according to the topology search result of the real-time topology relationship, until the total amount of allocated load batch control is greater than the load gap of each transmission and transformation section.

[0081] Specifically, if the whole network is not short of electricity and each transmission and transformation section is short of electricity, the load in the local section with power shortage will be transferred to the area without power shortage first. If there is still a load gap in the local section after the transfer, the first round of loads in the transmission and transformation section will be allocated according to the topological search results of the real-time topological relationship. If the local load gap cannot be met after all the first round of loads are allocated, the second round of loads will be allocated, and so on, until the total amount of all allocated load batch control is greater than the load gap in the local section.

[0082] S1033, when the whole network is in a state of power shortage and each transmission and transformation section is in a state of power shortage, the load in each transmission and transformation section is transferred to the area without power shortage. If after the load transfer, only the state of power shortage of the whole network is handled, the operation process when the whole network is in a state of power shortage and each transmission and transformation section is not in a state of power shortage is executed; if after the load transfer, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the executable load of the whole network is distributed according to the proportion of the actual load value of the first round of power supply area. If after the first round of load distribution, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the operation process when the whole network is in a state of power shortage and each transmission and transformation section is in a state of power shortage is executed; if after the first round of load distribution, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the next round of load distribution is executed until the total amount of load batch control is greater than the load gap.

[0083] Specifically, if the whole network is short of power and a local section is short of power, the load in the local section with power shortage shall be transferred to the area without power shortage as a priority. If after the transfer, only the whole network is short of power, repeat S1031. If after the transfer, the whole network is still short of power and a local section is short of power, the power shortage problem of the whole network shall be dealt with first, and the first round of load of the whole network shall be distributed in proportion to the actual value of the first round of load of each district and county. After execution, if the whole network is not short of power, but a local section is short of power, execute S1032. If after the first round of load distribution is completed, there is still a power shortage in the whole network and each transmission and transformation section, the second round of load distribution shall be carried out in the local section with power shortage according to the proportion of power shortage load. If after the second round of load distribution is completed, there is still a power shortage in the whole network and a local section, the third round of load distribution shall be carried out in the local section with power shortage according to the proportion of power shortage load. If the third round of load distribution is completed, and there is still power shortage in the entire network and each transmission and transformation section, the second and third rounds of load distribution in the area without power shortage will begin. If the second and third rounds of load distribution in the area without power shortage are also completed, and there is still power shortage in the entire network and each transmission and transformation section, the fourth and fifth rounds of load distribution in the power shortage area will be allocated. If the fourth and fifth rounds of load distribution in the power shortage area are also completed, and there is still power shortage in the entire network and each transmission and transformation section, the fourth and fifth rounds of load distribution in the area without power shortage will be allocated until the total amount of all allocated load batch control is greater than the load gap.

[0084] Specifically, taking the case of power shortage at the 500kV Shuzhou main transformer section and power supply in the entire network as an example, the control strategy that tends to minimize the number of switch operations is explained as follows:

[0085] The first step is to search for all the one-way sub-isolation pools in the power shortage area. The loads under the 500kV Shuzhou main transformer are transferred to the 500kV Guangdu and Xingmeng areas. After the load transfer, assuming that there is still a 50,000-kilowatt load gap in the 500kV Shuzhou main transformer section, all the one-way sub-isolation pools under the 500kV Shuzhou main transformer one-way main isolation pool are output according to the real-time topological relationship. The one-way sub-isolation pool includes its own 10kV feeder.

[0086] The second step is to sort the 10kV feeders. All 10kV feeders in the one-way sub-isolation pool are sorted in rounds of one, two, three, four, and five. The load ratios of each district and county in the same round are distributed, and the loads within the district and county are sorted from large to small. The Shuzhou main transformer includes the loads of Chongzhou, Dayi, Pujiang, Qionglai, and Dujiangyan. In the first round, the load of Chongzhou accounted for 44%. At this time, the load of the 10kV Gaojie Line 1 reached 4,200 kilowatts, so it ranked fifth in the first round of Chongzhou.

[0087] The third step is to form a control sequence. Since there is a 50,000-kilowatt load gap, a control sequence is formed according to 120% of it, that is, 60,000 kilowatts. Since the first round of load in the current 500kV Shuzhou one-way main isolation pool is 370,000 kilowatts, which is greater than 60,000 kilowatts and sufficient for distribution, Chongzhou needs to allocate the first round of load 6*44%=26,400 kilowatts. The 10kV lines in the first round of Chongzhou from 1 to 5 are included in the control strategy. Since the 10kV Gaojie Line 1 is in the 5th place in the first round, it is also included.

[0088] The fourth step is to implement control. During the control process, after the system was operated to the 4th position in the first round of Chongzhou, the controlled load had met the 50,000-kilowatt requirement, so the 10kV Gaojie Line was only included in the control strategy in this round of control but was not actually operated.

[0089] S104, according to the control strategy, realize load batch control of the whole network and / or each transmission and transformation section.

[0090] In this embodiment, the process of implementing load batch control of the entire network and / or each transmission and transformation section is as follows:

[0091] S1041: The operator sends the guardian to enter the 10kV switch load control program. The system provides two modes: single-step execution and continuous control. If single-step execution is selected, the operator needs to confirm the control of each load control switch. Continuous control is selected by default, and the system automatically and continuously completes the control operation of all load control switches without manual intervention in the process.

[0092] S1042: Before the switch remote control is preset, the system performs protection signal verification again. The load control switch cannot send out a Class I or Class II protection signal in the initiating state. Class I protection signals include total switch accidents, protection actions, reclosing action signals, etc. Class II protection signals include switch SF6 low pressure lock, switch spring without energy storage, switch control circuit disconnection, and protection device abnormality.

[0093] S1043: The operation is performed sequentially in the order of the first round, the second round, the third round, the fourth round, and the fifth round. The switches in the same round are operated simultaneously in parallel control mode.

[0094] S1044: During the operation of the load control switch, the system will monitor the remote signal and telemetry information of the load control switch in real time to determine whether the switch is under control. The switch position and telemetry verification waiting time can be set, and the default is 45 seconds.

[0095] S1045: After the switch remote control fails, the load control device automatically postpones the operation of the backup switch.

[0096] S1046: After completing the load batch operation, an operation record is generated in the dispatching control system area 1, recording the current before all switch operations, the state estimated current, the final current after the actual operation is completed, the switch operation (remote control) time and the actual position change time, the load amount and the number of lines of all intelligent load batch control.

[0097] S1047: Synchronize the control load information to the AVC and AGC systems, which will execute the voltage and frequency regulation strategies.

[0098] Please refer to Figure 2 , Figure 2 A block diagram of a device for implementing load batch control provided by an embodiment of the present invention, such as Figure 2 As shown, the device comprises:

[0099] A topology relationship establishment module 210 is used to input parameter information of operable transmission lines in the SCADA system according to the accident power restriction order table, and establish a real-time topology relationship of the operable transmission lines in the SCADA system according to the parameter information; wherein the real-time topology relationship is used to describe the subordinate relationship of the switches;

[0100] The load parameter determination module 220 is used to determine the load gap of the entire network and / or each power transmission and transformation section and the executable load of the entire network and / or each power transmission and transformation section according to the SCADA system when a power grid fault is detected;

[0101] The control strategy generation module 230 is used to generate a control strategy for load batch control according to the load gap amount and the executable load amount, combined with the round information of the accident power restriction ranking table and the real-time topological relationship of the operable transmission line;

[0102] The load control module 240 is used to implement load batch control of the entire network and / or each transmission and transformation section according to the control strategy.

[0103] The embodiment of the present invention also provides an electronic device, which includes a processor, a memory, a communication interface and at least one communication bus for connecting the processor, the memory and the communication interface. The memory includes but is not limited to a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (PROM) or a portable CD-ROM, and the memory is used for related instructions and data.

[0104] The communication interface is used to receive and send data. The processor can be one or more CPUs. When the processor is a CPU, the CPU can be a single-core CPU or a multi-core CPU. The processor in the electronic device is used to read one or more programs stored in the memory and perform the following operations: enter the parameter information of the operable transmission line in the SCADA system according to the accident power restriction priority table, and establish the real-time topological relationship of the operable transmission line in the SCADA system according to the parameter information; wherein the real-time topological relationship is used to describe the subordinate relationship of the switch; when a power grid failure is detected, determine the load gap amount of the entire network and / or each transmission and transformation section, and the executable load amount of the entire network and / or each transmission and transformation section according to the SCADA system; generate a control strategy for load batch control based on the load gap amount and the executable load amount, combined with the round information of the accident power restriction priority table and the real-time topological relationship of the operable transmission line; according to the control strategy, realize the load batch control of the entire network and / or each transmission and transformation section.

[0105] It should be noted that the specific implementation of each operation can be Figure 1 The corresponding description of the method embodiment shown, the electronic device can be used to execute a method for realizing load batch control in the above method embodiment of the present application, which will not be described in detail here.

[0106] In an embodiment of the present invention, a computer-readable storage medium is also provided, and the computer-readable storage medium is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, and the storage space stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of a method for realizing load batch control in the above embodiment. It should be understood by those skilled in the art that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0107] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for realizing load batch control, characterized in that: Methods include: Enter parameter information of operable transmission lines in the SCADA system according to the accident power restriction priority table, and establish real-time topological relationships of operable transmission lines in the SCADA system based on the parameter information; wherein the real-time topological relationship is used to describe the subordinate relationship of switches; When a power grid fault is detected, the load shortfall of the entire network and / or each power transmission and transformation section, as well as the executable load of the entire network and / or each power transmission and transformation section, are determined according to the SCADA system; Based on the load gap and executable load, combined with the round information of the accident power restriction priority table and the real-time topological relationship of the operable transmission lines, a control strategy for load batch control is generated; According to the control strategy, batch control of loads in the entire network and / or each transmission and transformation section is achieved.

2. A method for realizing load batch control according to claim 1, characterized in that: The parameter information includes one or more of the dual name, round, sequence, load type, affiliated unit, and security load of the transmission line.

3. A method for realizing load batch control according to claim 1, characterized in that: Establish real-time topological relationships of operational transmission lines, specifically: Take any 10kV feeder switch included in the accident power restriction priority list of the substation as the charge starting point, control the charge starting point to migrate on the main transformer, transmission line and busbar until it encounters the 220kV side switch of the 500kV main transformer or the disconnected switch, and use all the power equipment passed by the charge starting point during the migration process as the free pool of any 10kV feeder switch; According to the 10kV feeder switch in the free pool, the 220kV switch of the 500kV main transformer is preset as the one-way main isolation pool, the 220kV line switch of the transmission section is the one-way auxiliary isolation pool, and the 220kV side switch of the 220kV main transformer is the one-way sub-isolation pool; The topological relationship of the 10kV feeder switch is verified. When the topological relationship verification result of the 10kV feeder switch is correct, the topological relationship between the unidirectional sub-isolation pool and the unidirectional auxiliary isolation pool, the topological relationship between the unidirectional sub-isolation pool and the unidirectional main isolation pool, and the topological relationship between the unidirectional auxiliary isolation pool and the unidirectional main isolation pool are established.

4. A method for realizing load batch control according to claim 3, characterized in that: The topological relationship of the 10kV feeder switch is verified, specifically: when any 10kV feeder switch is only in one unidirectional sub-isolation pool, in at least one unidirectional main isolation pool, or in zero or more unidirectional auxiliary isolation pools, the topological relationship of the 10kV feeder switch is verified correctly.

5. A method for realizing load batch control according to claim 4, characterized in that: Establish the topological relationship between the unidirectional sub-isolation pool and the unidirectional auxiliary isolation pool, including: If all feeder switches of any one-way sub-isolation pool are in any one or more one-way auxiliary isolation pools, then any one-way sub-isolation pool is subordinate to any one or more one-way auxiliary isolation pools; wherein, the one-way sub-isolation pool may not belong to any one-way auxiliary isolation pool; Establishing a topological relationship between a unidirectional sub-isolation pool and a unidirectional main isolation pool, including: if all feeder switches of any unidirectional sub-isolation pool are in any one or more unidirectional main isolation pools, then any unidirectional sub-isolation pool is subordinate to any one or more unidirectional main isolation pools; wherein, a unidirectional sub-isolation pool belongs to at least one unidirectional main isolation pool; A topological relationship between the unidirectional auxiliary isolation pool and the unidirectional main isolation pool is established, including: if all feeder switches of any unidirectional auxiliary isolation pool are in any one or more unidirectional main isolation pools, then any unidirectional auxiliary isolation pool is subordinate to any one or more unidirectional main isolation pools; wherein, the unidirectional auxiliary isolation pool belongs to at least one unidirectional main isolation pool.

6. A method for realizing load batch control according to claim 1, characterized in that: Determine the load gap of the entire network and / or each transmission and transformation section based on the SCADA system, including: The difference between the current actual load of the entire network and the load plan value issued by the superior dispatcher is calculated to obtain the load gap of the entire network; Determine the active power difference between the 500kV main transformer offline active power, the transmission section active power and the 220kV main transformer offline active power, and calculate the difference between the active power difference and the set rated active power to obtain the load gap of each transmission and transformation section; Determine the executable load of the entire network and / or each transmission and transformation section based on the SCADA system, including: carry out control verification of the 10kV feeder switch that can be pulled in the SCADA system, and include the load supplied by the 10kV feeder switch that has passed the verification in the executable load.

7. A method for realizing load batch control according to claim 6, characterized in that: The control verification of the 10kV feeder switch with limited pulley capacity carried out in the SCADA system includes: switch position verification, switch flow verification, basic model verification, protection signal verification, sign verification, pressure plate verification and communication protocol verification.

8. A method for realizing load batch control according to claim 1, characterized in that: Based on the load gap and executable load, combined with the round information of the accident power restriction priority table, a control strategy for load batch control is generated, including: When the whole network is in a state of power shortage, but each transmission and transformation section is not short of power, the executable load of the whole network is distributed according to the proportion of the actual load value of the power supply area round information, until the total amount of distributed load batch control is greater than the load gap of the whole network; When the whole network is not short of electricity, but each transmission and transformation section is short of electricity, the load in each transmission and transformation section is transferred to the area without power shortage. If there is still a load gap in each transmission and transformation section after the load transfer, the executable load of each transmission and transformation section is allocated according to the proportion of the actual load value of the round information in the transmission and transformation section according to the topology search result of the real-time topology relationship, until the total amount of allocated load batch control is greater than the load gap of each transmission and transformation section; When the whole network is in a state of power shortage and each transmission and transformation section is in a state of power shortage, the load in each transmission and transformation section will be transferred to the area without power shortage. If after the load transfer, only the state of power shortage in the whole network is handled, the operation process when the whole network is in a state of power shortage and each transmission and transformation section is not in a state of power shortage will be executed; if after the load transfer, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the executable load of the whole network will be distributed according to the proportion of the actual load value of the first round in the power supply area. If after the first round of load distribution, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the operation process when the whole network is in a state of power shortage and each transmission and transformation section is in a state of power shortage will be executed; if after the first round of load distribution, the whole network is still in a state of power shortage and each transmission and transformation section is in a state of power shortage, the next round of load distribution will be executed until the total amount of load batch control is greater than the load gap.

9. A device for realizing load batch control, characterized in that: The device includes: A topology relationship establishment module is used to input parameter information of operable transmission lines in the SCADA system according to the accident power restriction order table, and establish a real-time topology relationship of the operable transmission lines in the SCADA system according to the parameter information; wherein the real-time topology relationship is used to describe the subordinate relationship of the switches; A load parameter determination module is used to determine the load gap of the entire network and / or each power transmission and transformation section, and the executable load of the entire network and / or each power transmission and transformation section according to the SCADA system when a power grid fault is detected; A control strategy generation module is used to generate a control strategy for load batch control based on the load gap and executable load, combined with the round information of the accident power restriction ranking table and the real-time topological relationship of the operable transmission lines; The load control module is used to realize load batch control of the entire network and / or each transmission and transformation section according to the control strategy.

10. An electronic device, characterized in that: The electronic device includes a processor, a memory, and a computer program stored in the memory and executable by the processor, wherein when the computer program is executed by the processor, the steps of a method for realizing load batch control as described in any one of claims 1 to 8 are implemented.

Images