Condition recognition method and line load reduction system

Abstract

The application relates to a state identification method and a line load reduction system. The state identification method comprises the following steps: acquiring line data, wherein the line data comprises any one of a line electrical quantity and a first line power; acquiring a line allowable switching state according to the line data, wherein the line allowable switching state comprises a line switchable state and a line non-switchable state; acquiring an outlet fixed value state of a low-frequency low-voltage load reduction device, wherein the outlet fixed value state comprises an outlet input state and an outlet non-input state; and acquiring an outlet comprehensive state of the low-frequency low-voltage load reduction device according to the line allowable switching state and the outlet fixed value state, wherein the outlet comprehensive state comprises a comprehensive switchable state and a comprehensive non-switchable state. The method can distinguish between a load line and a power line in real time and accurately judge whether a line can be load-reduced and switched off.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power systems, in particular to a state recognition method and a line load shedding system. BACKGROUND

[0002] With the development of power system technology, low-frequency low-voltage load shedding devices, as an important technical equipment of the third safety and stability line, have played an important role in ensuring the safe and stable operation of power systems and preventing the occurrence of blackouts. However, with the wide access of new energy equipment such as distributed power, micro-grid, energy storage, and electric vehicles, the proportion of traditional load lines with "source and load" dual characteristics is increasing, and the low-frequency low-voltage load shedding measures have become unsuitable, mainly reflected in the difficulty of the device to distinguish between load lines and power lines in real time, and the possibility of cutting off power lines when acting, which seriously affects the stability of the frequency and voltage of the power system. SUMMARY

[0003] Therefore, it is necessary to provide a state recognition method and a line load shedding system that can distinguish between load lines and power lines in real time and accurately determine whether the line can be load shedding and cut off.

[0004] In a first aspect, the present application provides a state recognition method. The method comprises:

[0005] obtaining line data, the line data comprising any one of line electrical quantities and first line power;

[0006] obtaining a line allowable cutting state according to the line data, the line allowable cutting state comprising a line cuttable state and a line non-cuttable state;

[0007] obtaining an outlet fixed value state of a low-frequency low-voltage load shedding device, the outlet fixed value state comprising an outlet input state and an outlet no input state;

[0008] obtaining an outlet comprehensive state of the low-frequency low-voltage load shedding device according to the line allowable cutting state and the outlet fixed value state, the outlet comprehensive state comprising a comprehensive cuttable state and a comprehensive non-cuttable state.

[0009] In one embodiment, the line data is configured with multiple obtaining methods, and the line allowable cutting state is obtained according to the line data, comprising:

[0010] obtaining the line data in the obtaining method;

[0011] determining a state judgment rule corresponding to the obtaining method, and the state judgment rules corresponding to at least two obtaining methods are different;

[0012] obtaining the line allowable cutting state according to the determined state judgment rule and the line data.

[0013] In one of the embodiments, the obtaining manner of the line data comprises at least one of the following:

[0014] When the line data is the line electrical quantity, the obtaining manner is direct sampling obtaining;

[0015] When the line data is the first line power, the obtaining manner is any one of management master station obtaining and monitoring system obtaining.

[0016] In one of the embodiments, the obtaining the line switching state according to the determined state judgment rule and the line data comprises at least one of the following:

[0017] When the line electrical quantity is obtained by the direct sampling, the line switching state is obtained according to a first state judgment rule;

[0018] When the first line power is obtained by the management master station and / or the monitoring system, the line switching state is obtained according to a second state judgment rule;

[0019] When the obtaining manner of the line data does not belong to any one of the direct sampling, the management master station obtaining, the monitoring system obtaining, the line switching state of all lines is a line switchable state.

[0020] In one of the embodiments, the line electrical quantity comprises line voltage and line current, and the line switching state is obtained according to the first state judgment rule when the line electrical quantity is obtained by the direct sampling, comprising:

[0021] A second line power is obtained according to the line voltage and the line current;

[0022] The line switching state is obtained according to the second line power;

[0023] The line switching state is obtained according to the second line power, comprising at least one of the following:

[0024] When the second line power is positive, the line switching state of the line with the positive second line power is the line switchable state;

[0025] When the second line power is negative, the line switching state of the line with the negative second line power is the line non-switchable state.

[0026] In one of the embodiments, the line switching state is obtained according to the second state judgment rule when the first line power is obtained by the management master station and / or the monitoring system, comprising:

[0027] when the first line power meets a sending condition, the management master station sends the first line power to the low frequency and low voltage load shedding device;

[0028] the low frequency and low voltage load shedding device acquires the line allowable trip state according to a time length of receiving the first line power and the first line power.

[0029] In one embodiment, the sending condition is any one of the first line power changing from forward power to reverse power and an interval time length between a previous time and a current time of the management master station sending the first line power reaching a preset time length.

[0030] In one embodiment, the low frequency and low voltage load shedding device acquiring the line allowable trip state according to the time length of receiving the first line power and the first line power includes at least one of:

[0031] when the time length of the low frequency and low voltage load shedding device receiving the first line power does not exceed a preset multiple of a preset time length, the low frequency and low voltage load shedding device acquires the line allowable trip state according to the first line power, the preset multiple is an integer and is greater than or equal to 2;

[0032] when the time length of the low frequency and low voltage load shedding device receiving the first line power exceeds the preset multiple of the preset time length, the low frequency and low voltage load shedding device determines that the line allowable trip state of all lines is the line allowable trip state.

[0033] In one embodiment, the low frequency and low voltage load shedding device acquiring the line allowable trip state according to the line allowable trip state and the outlet fixed value state includes:

[0034] the line allowable trip state and the outlet fixed value state are taken and, and the outlet comprehensive state is obtained.

[0035] In a second aspect, the application also provides a line load shedding system. The system includes:

[0036] a plurality of source and load modules, which are switchably operated in one of a power supply state and a load state;

[0037] a plurality of lines, which are respectively connected with the plurality of source and load modules, when the line is connected with the source and load module operated in the power supply state, the line is a power supply line, and when the line is connected with the source and load module operated in the load state, the line is a load line;

[0038] a low frequency and low voltage load shedding device, which is connected with the line, and is used for executing steps of the above method and controlling the line load shedding device to be cut off when the outlet comprehensive state is the comprehensive allowable trip state.

[0039] The state recognition method and the line load shedding system can obtain the line allowable cutting state through any one of the obtained line electrical quantity and the first line power, and when the line allowable cutting state is a line allowable cutting state, the line is a load line, and when the line allowable cutting state is a line unallowable cutting state, the line is a power line. Furthermore, the outlet comprehensive state of the low-frequency low-voltage load shedding device can be obtained through the line allowable cutting state and the obtained outlet fixed value state of the low-frequency low-voltage load shedding device, and when the outlet comprehensive state is a comprehensive allowable cutting state, the line can be cut off by load shedding, and when the outlet comprehensive state is a comprehensive unallowable cutting state, the line cannot be cut off by load shedding. Based on the technical features, the power line and the load line can be distinguished in real time, and whether the line can be cut off by load shedding of the low-frequency low-voltage load shedding device can be accurately judged, so that the power line is effectively avoided from being cut off by the low-frequency low-voltage load shedding device, and the stability of the frequency and voltage of the power system is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 One of the flowcharts of the state recognition method in an embodiment;

[0041] Figure 2 The flowchart of obtaining the line allowable cutting state according to the line data in an embodiment;

[0042] Figure 3 The flowchart of obtaining the line allowable cutting state according to the determined state judgment rule and the line data in an embodiment;

[0043] Figure 4 The flowchart of obtaining the line allowable cutting state according to the first state judgment rule when the line electrical quantity is obtained through the direct sampling in an embodiment;

[0044] Figure 5 The flowchart of obtaining the line allowable cutting state according to the second state judgment rule when the first line power is obtained through the management master station and / or the monitoring system in an embodiment;

[0045] Figure 6 The flowchart of obtaining the line allowable cutting state according to the time length of receiving the first line power and the first line power by the low-frequency low-voltage load shedding device in an embodiment;

[0046] Figure 7 The second flowchart of the state recognition method in an embodiment;

[0047] Figure 8 The structural diagram of the line load shedding system in an embodiment;

[0048] Figure 9 The action principle diagram of the low-frequency low-voltage load shedding device in an embodiment;

[0049] Figure 10FIG. 1 is a diagram of an internal structure of a computer device according to an embodiment. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the embodiments of the present application, the embodiments of the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the embodiments of the present application can be implemented in many different forms and are not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to make the disclosure of the embodiments of the present application more thorough and comprehensive.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of the present application belong. The terminology used in the description of the embodiments of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application.

[0052] It can be understood that the terms "first", "second", and the like can be used herein to describe various line powers, but these line powers are not limited by these terms. These terms are only used to distinguish one line power from another line power. For example, without departing from the scope of the present application, a first line power can be called a second line power, and similarly, a second line power can be called a first line power. Similarly, the terms "first", "second" are used to describe various state determination rules in the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0053] As used herein, the singular forms "a", "an" and "the" can include plural forms unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Meanwhile, the term "and / or" used in the specification includes any and all combinations of the related listed items.

[0054] It should be noted that when one device is considered to be "connected" to another device, it can be directly connected to another device or connected to another device through a central device. In addition, "connected" in the following embodiments should be understood as "electrically connected", "communicatively connected", etc. if there is a transfer of electrical signals, communication signals, etc. between the connected objects.

[0055] In one of the embodiments, as shown in Figure 1 A state identification method is provided. Distributed power sources are not directly connected to centralized power transmission systems, but are distributed at user end and accessed to 35V and below voltage level power grid for local consumption. With the wide access of distributed power sources, the power supply and demand form presents diversified signs. In order to maintain the frequency and voltage stability of the power system, the control rate of low frequency and low voltage load shedding needs to be improved. The embodiment provides a state identification method of low frequency and low voltage load shedding line suitable for wide access of distributed power sources. In the embodiment, the method comprises the following steps:

[0056] Step 100, acquiring line data, wherein the line data comprises any one of line electrical quantity and first line power.

[0057] Step 200, acquiring line allowable cutting state according to the line data.

[0058] The line allowable cutting state comprises line cuttable state and line non-cuttable state. Specifically, the line allowable cutting state can be represented by binary number 1 and 0, wherein 1 represents the line cuttable state and 0 represents the line non-cuttable state. Alternatively, the initial state of all lines is the line non-cuttable state.

[0059] Step 300, acquiring outlet fixed value state of low frequency and low voltage load shedding device.

[0060] The outlet fixed value state of each round of the low frequency and low voltage load shedding device comprises outlet input state and outlet no input state. When each round is in the outlet input state, it means that the corresponding round is in action, and when it is in the outlet no input state, it means that the corresponding round is not in action. Specifically, each round of the low frequency and low voltage load shedding device has the outlet fixed value state, and the outlet fixed value state of the corresponding round is acquired when different rounds are in action. The outlet fixed value state is a state set for the low frequency and low voltage load shedding action to cut off which lines, and can be represented by binary number 1 and 0, wherein 1 represents the outlet input state and 0 represents the outlet no input state.

[0061] Step 400, acquiring outlet comprehensive state of the low frequency and low voltage load shedding device according to the line allowable cutting state and the outlet fixed value state.

[0062] The outlet comprehensive state comprises comprehensive cuttable state and comprehensive non-cuttable state. Specifically, the outlet comprehensive state can also be represented by binary number 1 and 0, wherein 1 represents the comprehensive cuttable state and 0 represents the comprehensive non-cuttable state. The initial state of all low frequency and low voltage load shedding lines is the comprehensive non-cuttable state.

[0063] In the embodiment, the state recognition method, the low-frequency and low-voltage load shedding device can obtain the line allowable cutting state through any one of the line data of the line electrical quantity and the first line power, when the line is in the line allowable cutting state, the line is the load line, and when the line is in the line unallowable cutting state, the line is the power line. Furthermore, the outlet comprehensive state of the low-frequency and low-voltage load shedding device can be obtained through the line allowable cutting state and the outlet fixed value state of the low-frequency and low-voltage load shedding device, when the line is in the comprehensive allowable cutting state, the line can be cut off by load shedding, and when the line is in the comprehensive unallowable cutting state, the line cannot be cut off by load shedding. Based on the technical features, the load line and the power line can be distinguished in real time, and whether the line can be cut off by load shedding of the low-frequency and low-voltage load shedding device can be accurately judged, the power line is effectively avoided from being cut off when the low-frequency and low-voltage load shedding device acts, and the stability of the frequency and voltage of the power system is maintained.

[0064] In one embodiment, as shown in Figure 2 The line data is configured with multiple acquisition modes, and the step 200 of acquiring the line allowable cutting state according to the line data includes:

[0065] The step 210 is acquiring the acquisition mode of the line data. In the embodiment, the acquisition mode includes the direct sampling acquisition, the management master station acquisition and the monitoring system acquisition. The direct sampling acquisition is acquired by means such as a cable, a set value (SV value) of an electrical element, GOOSE transmission and the like. The management master station acquisition and the monitoring system acquisition are two remote acquisition modes, the management master station acquisition refers to the acquisition through communication with a dispatching master station, a management system for monitoring power operation and the like, and the monitoring system acquisition refers to the acquisition through communication with a monitoring system of a substation.

[0066] The step 220 is determining the state judgment rule corresponding to the acquisition mode, and the state judgment rules corresponding to the at least two acquisition modes are different.

[0067] The step 230 is acquiring the line allowable cutting state according to the determined state judgment rule and the line data.

[0068] In the embodiment, the line can be judged to be in the line allowable cutting state or the line unallowable cutting state under the condition that different line data is acquired by different acquisition modes.

[0069] In one of the embodiments, the way of obtaining the line data in the step 210 comprises at least one of the following: when the line data is the line electrical quantity, the way of obtaining is direct sampling; when the line data is the first line power, the way of obtaining is any one of the management master station and the monitoring system.

[0070] In one of the embodiments, as shown in Figure 3 the step 230, the line switching state is obtained according to the determined state judgment rule and the line data, which comprises at least one of the following:

[0071] In the step 231, when the line electrical quantity is obtained by direct sampling, the line switching state is obtained according to the first state judgment rule.

[0072] In the step 232, when the first line power is obtained by the management master station and / or the monitoring system, the line switching state is obtained according to the second state judgment rule. The state judgment rule for judging the line switching state by the two remote obtaining ways of the management master station and the monitoring system is the same, and in engineering practice, one of the two ways is often selected according to the site condition.

[0073] In the step 233, when the way of obtaining the line data is not any one of the direct sampling, the management master station and the monitoring system, the line switching state of all lines is line switching.

[0074] In this embodiment, the purpose of this method is mainly to deal with the situation of abnormal communication.

[0075] In one of the embodiments, as shown in Figure 4 the line electrical quantity comprises line voltage and line current, and the step 231 comprises:

[0076] In the step 240, the second line power is obtained according to the line voltage and the line current. The line switching state is obtained according to the second line power, which comprises at least one of the following:

[0077] Step 241, when the second line power is positive, obtaining the line allowable cutting state of the line with positive second line power as the line allowable cutting state.

[0078] Step 242, when the second line power is negative, obtaining the line allowable cutting state of the line with negative second line power as the line unallowable cutting state.

[0079] In the embodiment, when the second line power is positive, it indicates that the line is the load line, and thus the low-frequency and low-voltage load shedding device can be actuated to cut off the line under certain conditions; when the second line power is negative, it indicates that the line is the power line, and the low-frequency and low-voltage load shedding device cannot cut off the line.

[0080] In one of the embodiments, as shown in Figure 5 Step 232, when the first line power is obtained by the management master station and / or the monitoring system, obtaining the line allowable cutting state according to the second state judgment rule includes:

[0081] Step 250, when the first line power meets the sending condition, the management master station sends the first line power to the low-frequency and low-voltage load shedding device.

[0082] Step 251, the low-frequency and low-voltage load shedding device obtains the line allowable cutting state according to the time length of receiving the first line power and the first line power. In the embodiment, whether the low-frequency and low-voltage load shedding device receives the first line power within a certain time length is the basis for judging whether a communication interruption occurs. If it is not received within a certain time length, it usually indicates that an abnormal situation such as a communication interruption occurs, and thus the line allowable cutting state also needs to be obtained.

[0083] In one of the embodiments, the sending condition is any one of the first line power changing from positive power to negative power and the interval time length between the previous and the last sending of the first line power by the management master station reaching a preset delay time length. In the embodiment, the positive or negative value of the first line power is the judgment condition of the line allowable cutting state. When the first line power changes, it indicates that the line allowable cutting state changes, and thus it needs to be sent immediately.

[0084] In one of the embodiments, as shown in Figure 6 Step 251, the low-frequency and low-voltage load shedding device obtains the line allowable cutting state according to the time length of receiving the first line power and the first line power includes at least one of the following:

[0085] Step 260: When the duration for which the low-frequency low-voltage load shedding device receives the first line power does not exceed a preset multiple of the preset delay duration, the line cut-off status is obtained based on the first line power, wherein the preset multiple is an integer and greater than or equal to 2.

[0086] Step 261: When the duration for which the low-frequency low-voltage load shedding device receives the power of the first line exceeds the preset multiple of the preset delay duration, the line cut-off state of all lines is determined to be the line cut-off state.

[0087] In this embodiment, the preset multiple can be set to 3. Under normal circumstances, the low-frequency low-voltage load shedding device can receive the first line power once within one preset delay period, that is, within 3 times the corresponding time period, it can receive the corresponding data three times in principle. If the low-frequency low-voltage load shedding device still does not receive any data within 3 times the corresponding time period, it can be determined that an abnormal situation such as communication interruption has occurred. At this time, it is necessary to determine that all lines are in the line switchable state.

[0088] In one embodiment, step 300, which involves obtaining the overall output state of the low-frequency low-voltage load shedding device based on the line cut-off state and the output setpoint state, includes: taking the AND operation of the line cut-off state and the output setpoint state to obtain the overall output state. In this embodiment, when the line cut-off state is the line cut-off state 1 and the output setpoint state is the output input state 1, taking the AND operation yields the overall output state as the overall cut-off state 1. At this time, the power of the first line or the power of the second line is positive, the line is the load line, and because the overall output state is 1, the low-frequency low-voltage load shedding device can reduce the load and cut off the line under the given conditions.

[0089] In one embodiment, such as Figure 7 As shown, in step 100, line data is acquired, which includes either line electrical quantities or a first line power. The line data is configured with multiple acquisition methods. In step 211, when the line data is the line electrical quantity, the acquisition method is direct sampling, and the line electrical quantity includes line voltage and line current. In step 212, when the line data is the first line power, the acquisition method is either acquisition by the management master station or acquisition by the monitoring system.

[0090] Step 220: Determine the state judgment rule corresponding to the acquisition method, where at least two acquisition methods have different state judgment rules:

[0091] Firstly, in step 240, a second line power is obtained according to the line voltage and the line current, in step 241, when the second line power is positive, the line allowable cutting state of the line with the positive second line power is the line cutting state, and the line allowable cutting state includes the line cutting state and the line non-cutting state, in step 242, when the second line power is negative, the line allowable cutting state of the line with the negative second line power is the line non-cutting state.

[0092] Secondly, in step 250, when the first line power meets a sending condition, the management master station sends the first line power to the low-frequency low-voltage load shedding device. The sending condition is any one of that the first line power changes from positive power to negative power and that the interval time length between the previous time and the current time when the management master station sends the first line power reaches a preset delay time length. In step 260, when the low-frequency low-voltage load shedding device receives the first line power for a time length not exceeding a preset multiple of the preset delay time length, the line allowable cutting state is obtained according to the first line power, and the preset multiple is an integer and is greater than or equal to 2. In step 261, when the low-frequency low-voltage load shedding device receives the first line power for a time length exceeding the preset multiple of the preset delay time length, the line allowable cutting state of all lines is determined to be the line cutting state.

[0093] Finally, in step 233, when the line data is obtained in a manner not belonging to any one of the direct sampling, the management master station obtaining, and the monitoring system obtaining, the line allowable cutting state of all lines is obtained to be the line cutting state.

[0094] Further, in step 300, an outlet fixed value state of the low-frequency low-voltage load shedding device is obtained, and the outlet fixed value state includes an outlet input state and an outlet non-input state. In step 400, the line allowable cutting state and the outlet fixed value state are taken with each other to obtain an outlet comprehensive state, and the outlet comprehensive state includes a comprehensive cutting state and a comprehensive non-cutting state.

[0095] In the embodiment, according to the first line power or the second line power being positive, it can be judged that the line is in the line cutting state 1, and the line can be distinguished to be the load line, and otherwise, the line is the power line. According to the line allowable cutting state being the line cutting state 1 and the outlet fixed value state being the outlet input state 1, the outlet comprehensive state is taken with each other to be the comprehensive cutting state 1, the low-frequency low-voltage load shedding device acts, and the line can be cut off. Other cases are the comprehensive non-cutting state 0, and the line cannot be cut off. Through the embodiment, the load line and the power line can be distinguished in real time, and it can be accurately judged whether the line can be cut off by the low-frequency low-voltage load shedding device.

[0096] It should be understood that, although the steps in the flowcharts Figures 1-7 associated with the embodiments described above are shown in sequential order, such steps are not necessarily performed in the order shown by the arrows. Unless explicitly stated otherwise, the execution of the steps is not necessarily limited to the order shown, and the steps can be performed in other orders. Moreover, at least some of the steps in the flowcharts Figures 1-7 associated with the embodiments described above can comprise multiple steps or stages, which are not necessarily performed at the same time, but can be performed at different times, and which are not necessarily performed sequentially, but can be performed alternately or in rotation with at least some of the other steps or stages of other steps.

[0097] As shown in Figure 8 , the embodiments of the present application also provide a line load shedding system, comprising: a plurality of source-load modules 600, a plurality of lines 700 and a low-frequency low-voltage load shedding device 800, wherein:

[0098] The plurality of source-load modules 600 are switchably operated in one of a power supply state and a load state.

[0099] The plurality of lines 700 are respectively connected with the plurality of source-load modules 600, when the lines 700 are connected with the source-load modules 600 operated in the power supply state, the lines 700 are power supply lines, and when the lines 700 are connected with the source-load modules 600 operated in the load state, the lines 700 are load lines.

[0100] The low-frequency low-voltage load shedding device 800 is connected with the lines 700, and is used for performing the steps of any one of the methods described above, and controlling the line load shedding to be cut off when the outlet comprehensive state is the comprehensive available state.

[0101] In the embodiments, the source-load modules are connected with each other through the lines and the low-frequency low-voltage load shedding device. Specifically, as shown in Figure 8As shown, the 1# source-load module is connected with the 2# source-load module through the 1# line, the low-frequency low-voltage load shedding device and the 2# line, and is connected with the 3# source-load module through the 1# line, the low-frequency low-voltage load shedding device and the 3# line. When the 1# source-load module works in the power supply state, the 1# line is the power supply line, the 2# and 3# source-load modules work in the load state, and the 2# and 3# lines are the load lines. At this time, if it is judged according to the above method that the 2# line belongs to the line cuttable state, and it is judged that the outlet comprehensive state of the corresponding round of the low-frequency low-voltage load shedding device is the comprehensive cuttable state, the low-frequency low-voltage load shedding device controls the 2# line to be cut off. At this time, the 1# source-load module still works in the power supply state, and the 3# source-load module still works in the load state.

[0102] In the embodiment, the action principle diagram of the low-frequency low-voltage load shedding device is as shown in Figure 9 The action of the low-frequency low-voltage load shedding device in the distributed power supply line is divided into the input stage of frequency and voltage, the processing stage of the device and the output stage of action. In the input stage, the frequency and voltage of the power supply line or the load line are sampled through the three acquisition modes of the direct sampling acquisition, the management master station acquisition and the monitoring system acquisition. Specifically, the direct sampling acquisition is local sampling, the management master station acquisition and the monitoring system acquisition are remote sampling, the management master station acquisition needs to be dispatched and transmitted, and is protected by the remote gateway, and the monitoring system acquisition needs to be transmitted in the station. In the processing stage, whether the frequency and voltage meet the action conditions of each round of the low-frequency low-voltage load shedding device is judged comprehensively, whether each round is to be acted and whether to be delayed is determined, and the judgment result is output. The action conditions of each round involve that the frequency is less than the action setting value, the RoCoF acceleration action, the RoCoF locking logic, the voltage is less than the action setting value, the voltage rate of change acceleration action, the voltage rate of change locking logic and the like. At the same time, the positive and negative of the power of the line and the line cuttable state are judged, and the judgment result is output. In the output stage, the judgment result is combined with the outlet setting value state of each round, and it is determined whether the corresponding round is to be acted.

[0103] As shown in Figure 10 The embodiment of the application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above state identification method when executing the computer program.

[0104] Those skilled in the art can understand, Figure 10 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the application, and does not constitute a limitation on the computer device to which the scheme of the application is applied. The specific computer device can include moreFigure 10 more or fewer components, or with components arranged in different locations and / or in a different order, or with some components combined.

[0105] The embodiments of the present application further provide a computer readable storage medium. The computer readable storage medium has a computer program stored thereon, and the computer program is executed by a processor to implement the steps of the state recognition method.

[0106] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiments of the method. Any reference to memory, database or other medium used in the embodiments provided by the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided by the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided by the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0107] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0108] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A state recognition method, characterized in that, The method includes: Acquire line data, wherein the line data includes either line electrical quantities or a first line power; The line cutting status is obtained based on the line data, and the line cutting status includes the line cutting state and the line cutting non-cutting state. The outlet setpoint status of the low-frequency low-voltage load shedding device is obtained. The outlet setpoint status includes an outlet engaged state and an outlet disengaged state. When the outlet setpoint status is in the outlet engaged state, it indicates that the corresponding cycle is activated. When the outlet setpoint status is in the outlet disengaged state, it indicates that the corresponding cycle is not activated. The overall output status of the low-frequency low-voltage load shearing device is obtained based on the line cut-off status and the output set value status. The overall output status includes an overall cut-off status and an overall uncut-off status. The line data is configured to be acquired in multiple ways, and the process of obtaining the line switching status based on the line data includes: Obtain the acquisition method of the line data; determine the status judgment rule corresponding to the acquisition method, wherein the status judgment rules corresponding to at least two acquisition methods are different; obtain the line cut-off status according to the determined status judgment rule and the line data; The method for acquiring the line data includes at least one of the following: When the line data is the line electrical quantity, the acquisition method is direct sampling. When the line data is the power of the first line, the acquisition method is either acquisition by the management master station or acquisition by the monitoring system; acquisition by the management master station means acquisition by establishing communication with the management system of the dispatch master station to control and monitor the power operation; acquisition by the monitoring system means acquisition by establishing communication with the monitoring system of the substation. The step of obtaining the line cut-off status based on the determined status judgment rule and the line data includes at least one of the following: When the line electrical quantity is obtained through direct sampling, the line cut-off status is obtained according to the first state judgment rule; when the first line power is obtained through the management master station and / or the monitoring system, the line cut-off status is obtained according to the second state judgment rule; when the line data acquisition method does not belong to any of the direct sampling acquisition, the management master station acquisition, or the monitoring system acquisition, the line cut-off status of all lines is obtained as the line cut-off status; The line electrical quantities include line voltage and line current. When the line electrical quantities are obtained through direct sampling, the line cut-off state is determined according to the first state judgment rule, including: The second line power is obtained based on the line voltage and the line current; the line cut-off status is obtained based on the second line power. The step of obtaining the line cutting status based on the second line power includes at least one of the following: when the second line power is positive, the line cutting status of the line with positive second line power is obtained as the line cutting status; when the second line power is negative, the line cutting status of the line with negative second line power is obtained as the line cutting status. When the power of the first line is obtained through the management master station and / or the monitoring system, the process of obtaining the line cut-off status according to the second status judgment rule includes: When the first line power meets the transmission conditions, the management master station sends the first line power to the low-frequency low-voltage load shedding device; the low-frequency low-voltage load shedding device obtains the line cut-off status based on the duration of receiving the first line power and the first line power; the transmission conditions are either the first line power changing from positive power to negative power or the interval between the previous and subsequent transmissions of the first line power by the management master station reaching a preset delay duration. The low-frequency low-voltage load shedding device obtains the line cut-off status based on the duration of receiving the first line power and the first line power, including at least one of the following: When the duration for which the low-frequency low-voltage load shedding device receives the first line power does not exceed a preset multiple of the preset delay duration, the line cut-off status is obtained based on the first line power, where the preset multiple is an integer and greater than or equal to 2. When the duration for which the low-frequency low-voltage load shedding device receives the power of the first line exceeds a preset multiple of the preset delay duration, the line cut-off state of all lines is determined to be the line cut-off state.

2. The method according to claim 1, characterized in that, The step of obtaining the overall output status of the low-frequency low-voltage load shearing device based on the line cut-off status and the output setpoint status includes: The combined output status is obtained by taking the AND operation of the line cut-off status and the output setpoint status.

3. A line load reduction system, characterized in that, include: Multiple source and load modules can switch between power and load states; Multiple lines are connected to multiple source-load modules respectively. When a line is connected to a source-load module operating in a power-on state, the line is a power line. When a line is connected to a source-load module operating in a load state, the line is a load line. A low-frequency, low-voltage load shedding device, connected to the line, is used to perform the steps of the method as described in any one of claims 1 to 2, and to control the line load shedding disconnection when the overall output state is in an overall cut-off state.

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