Intelligent low-frequency load shedding device

Abstract

The invention relates to an intelligent low-frequency load shedding device applied to the technical field of power system protection, which comprises a frequency monitoring load shedding unit and a delay timing unit, and is characterized in that the frequency monitoring load shedding unit comprises a threshold setting module, a frequency monitoring module, an analysis master control module and a load shedding execution module; the delay timing unit comprises a timing control module and an electronic timing module, when the operation frequency of a power system is lower than a normal range, the low-frequency load shedding device can carry out further, comprehensive and intelligent analysis and judgment according to the frequency reduction degree, whether load shedding is executed immediately or not can be intelligently judged according to the frequency reduction degree, and the operation efficiency of the power system is improved. According to the method, intelligent delay can be carried out according to the frequency reduction degree if the frequency is reduced or the execution of load removal is delayed, so that unnecessary load removal under non-emergency conditions can be avoided, sufficient load can be effectively and quickly removed under emergency conditions, and stable operation of a power system can be effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to a low-frequency load shedding device, in particular to an intelligent low-frequency load shedding device applied in the technical field of power system protection. Background Art

[0002] In the power system, when there is a shortage of active power in the system, the frequency will drop. The low-frequency load shedding device is an important safety automatic device, which is used to automatically cut off part of the load when the system frequency drops to a certain level to maintain the stable operation of the system. As the line of defense of the power system, low-frequency load shedding is an important means to ensure that the system does not experience frequency collapse and maintain stable operation. It is the "lifeline" for the safe and stable operation of the new power system.

[0003] A Chinese patent with application number CN202311686282.0 discloses an electric power low-frequency load reduction system, including a D5000 system with a built-in marketing system, a computer room server and a circuit breaker low-frequency load reduction device; the D5000 system includes a marketing system, a user collection system, a fee control switch, a frequency collection and remote control module; the circuit breaker low-frequency load reduction device includes an active load line, a high-voltage user fee control switch, a frequency collection and remote control module; the D5000 system calculates power grid operation data and load forecasts in real time; the present invention can not only accurately cut off power grid loads to ensure the selectivity of low-frequency load cutting, but also dynamically analyze and predict the power grid operation status to achieve dynamic adjustability of low-frequency load reduction constants.

[0004] The low-frequency load shedding device in the prior art can remove part of the load when the operating frequency of the power system is lower than the normal range, but it can only perform simple shedding operations according to the preset threshold. This method may lead to unnecessary load shedding in non-emergency situations, and may not be able to effectively and quickly remove enough load in emergency situations, thus affecting the stable operation of the power system. Therefore, we propose an intelligent low-frequency load shedding device. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is: although the low-frequency load reduction device in the prior art can cut off part of the load when the operating frequency of the power system is lower than the normal range, it can often only perform simple cutting operations according to a preset threshold value. This method may lead to unnecessary load cutting in non-emergency situations, and may also fail to effectively and quickly cut off enough load in emergency situations, thereby affecting the stable operation of the power system.

[0006] In order to solve the above problems, the present invention provides an intelligent low-frequency load shedding device, including a frequency monitoring load shedding unit and a delay timing unit, wherein the frequency monitoring load shedding unit includes a threshold setting module, a frequency monitoring module, an analysis master control module, and a load shedding execution module, and the delay timing unit includes a timing control module and an electronic timing module; The threshold setting module and the frequency monitoring module are both connected to the analysis master control module by signal, the analysis master control module is connected to the timing control module and the load reduction execution module by signal, the threshold setting module is also connected to the timing control module by signal, and the timing control module is connected to the electronic timing module by signal; The threshold setting module is used to set the frequency threshold and send the frequency threshold to the analysis and control module. The frequency monitoring module is used to monitor the real-time frequency data during the operation of the power system and transmit the real-time frequency data to the analysis and control module in real time. The analysis and control module is used to receive the frequency threshold and the real-time frequency data and compare the real-time frequency data with the frequency threshold, and control the load shedding execution module to perform the load shedding operation. The load shedding execution module is used to perform the load shedding operation. The threshold setting module is also used to set the duration threshold and send the duration threshold to the timing control module.

[0007] In the above-mentioned intelligent low-frequency load reduction device, when the operating frequency of the power system is lower than the normal range, the low-frequency load reduction device will conduct further, comprehensive and intelligent analysis and judgment according to the degree of frequency reduction, thereby avoiding unnecessary load shedding in non-emergency situations, and effectively ensuring that sufficient load can be effectively and quickly sheared off in emergency situations, thereby effectively ensuring the stable operation of the power system.

[0008] As a further improvement of the present application, the frequency threshold includes a normal frequency threshold, a delayed frequency threshold, a fast delayed frequency threshold, and an immediate frequency reduction threshold. The duration threshold includes a delayed duration threshold and a fast delayed duration threshold. The normal frequency threshold matches the lowest frequency during normal operation of the power system. The normal frequency threshold, the delayed frequency threshold, the fast delayed frequency threshold, and the immediate frequency reduction threshold decrease in sequence. The delayed duration threshold is greater than the fast delay duration threshold.

[0009] As a further improvement of the present application, a method for using the intelligent low-frequency load reduction device comprises the following steps: S1. According to the normal operating frequency of the power system, a normal frequency threshold is set through a threshold setting module, and according to the normal frequency threshold and the operation requirements of the power system, a delay frequency threshold, a quick delay frequency threshold, an immediate frequency reduction threshold, a delay time threshold, and a quick delay time threshold are reasonably set through the threshold setting module; S2. When the real-time frequency data is lower than the delay frequency threshold, the analysis master control module will send an instruction to the timing control module to make the delay timing unit perform timing according to the delay time threshold. After the timing time reaches the delay time threshold, the timing control module will send a feedback signal to the analysis master control module. At this time, if the real-time frequency data is still lower than the normal frequency threshold, the analysis master control module will send an instruction to the load shedding execution module to make the load shedding execution module perform the load shedding operation; S3. When the real-time frequency data is lower than the fast-delay frequency threshold, the analysis master control module will send an instruction to the timing control module to make the delay timing unit perform timing according to the fast-delay time threshold. After the timing reaches the fast-delay time threshold, the timing control module will send a feedback signal to the analysis master control module. At this time, if the real-time frequency data is still lower than the normal frequency threshold, the analysis master control module will send an instruction to the load shedding execution module to make the load shedding execution module perform the load shedding operation. S4. When the real-time frequency data is lower than the frequency reduction threshold, the analysis and control module will directly send instructions to the load reduction execution module, so that the load reduction execution module executes the load shedding operation.

[0010] As another improvement of the present application, the frequency monitoring load shedding unit also includes a load shedding setting module and an audible and visual alarm. The load shedding setting module is connected to the signal of the analysis master control module, and the analysis master control module is connected to the signal of the audible and visual alarm. The load shedding setting module is used to classify the load, and the duration threshold also includes a reduction time threshold, which is less than the speed delay time threshold.

[0011] As another improvement supplement to the present application, the time reduction judgment threshold is smaller than the fast delay time threshold. In step S1, when setting the slow delay time threshold and the fast delay time threshold, it is also necessary to set the time reduction judgment threshold, and classify the load through the load reduction setting module, and classify the load into multiple rounds, which can further improve the intelligence, functionality and reliability of the low-frequency load reduction device, thereby further ensuring the stable operation of the power system.

[0012] As another improvement of the present application, the delay timing unit also includes a delay verification mechanism, which includes a light-shielding verification box, a light-shielding partition matching it is fixedly installed in the middle of the light-shielding verification box, an electric meter flashing light and a revolution meter flashing light are fixedly installed on the top inner wall of the light-shielding verification box, and an electric meter brightness sensor and a revolution meter brightness sensor are fixedly installed on the bottom inner wall of the light-shielding verification box.

[0013] As another improvement supplement to the present application, the light-shielding verification box and the light-shielding partition are both made of opaque materials, the electric meter flashing light and the rpm meter flashing light are respectively located on the left and right sides of the light-shielding partition, the electric meter brightness sensor and the rpm meter brightness sensor are respectively located on the left and right sides of the light-shielding partition, the electric meter brightness sensor is located directly below the electric meter flashing light, and the rpm meter brightness sensor is located directly below the rpm meter flashing light.

[0014] As another improvement supplement to the present application, the delay verification mechanism also includes a timing motor and a photoelectric encoder arranged on the output end of the timing motor. The delay timing unit also includes a rotation measurement and timing module and a timing analysis module. The electronic timing module is connected to the signal of the electric meter flashing light. The timing control module is also connected to the signal of the rotation measurement and timing module. The photoelectric encoder is connected to the signal of the rotation measurement and timing module. The rotation measurement and timing module is connected to the flashing light of the rotation meter and the timing motor signal.

[0015] As another improvement supplement of the present application, the delay verification mechanism also includes a reminder light, and the rotation measurement timing module is connected to the reminder light signal, which can greatly improve the accuracy and reliability of the timing function of the delay timing unit, thereby further ensuring the stable operation of the power system.

[0016] To sum up, when the operating frequency of the power system is lower than the normal range, the low-frequency load reduction device in the present application will perform further, comprehensive and intelligent analysis and judgment according to the degree of frequency reduction. It will not only intelligently judge whether to immediately perform load shedding or delay the load shedding according to the degree of frequency reduction, but also perform intelligent delay according to the degree of frequency reduction, thereby avoiding unnecessary load shedding in non-emergency situations, and effectively ensuring that sufficient load can be effectively and quickly sheared off in emergency situations, thereby effectively ensuring the stable operation of the power system. Through the joint setting of the load reduction setting module, the sound and light alarm, etc., the intelligence, functionality and reliability of the low-frequency load reduction device can be further improved; through the joint setting of the delay verification mechanism, the rotation measurement timing module, the timing analysis module, etc., the delay timing unit has two timing means with different principles and methods, and the two timing means can be verified with each other. When a problem with the timing accuracy is found through mutual verification, a reminder will be issued to the relevant technical personnel, prompting the technical personnel to take corresponding measures in time, thereby greatly improving the accuracy and reliability of the timing function of the delay timing unit, thereby further ensuring the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a principle flow chart of the intelligent low-frequency load reduction device in the first embodiment of the present application; Figure 2 This is a system structure block diagram of the frequency monitoring and load shedding unit in the first embodiment of the present application; Figure 3 This is a system structure block diagram of the delay timing unit in the first and second implementation modes of the present application; Figure 4 This is a system structure block diagram of the frequency monitoring and load shedding unit in the second and third implementation modes of the present application; Figure 5 This is a system structure block diagram of a delay timing unit in a third embodiment of the present application; Figure 6 This is a schematic cross-sectional structure diagram of a light-shielding verification box in the third embodiment of the present application.

[0018] Description of the numbers in the figure: 101. Light-shielding verification box; 102. Light-shielding partition; 103. Electric meter flashing light; 104. Turn meter flashing light; 105. Electric meter brightness sensor; 106. Turn meter brightness sensor. DETAILED DESCRIPTION

[0019] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0020] The first implementation method: Figure 1-3 An intelligent low-frequency load shedding device is shown, comprising a frequency monitoring load shedding unit and a delay timing unit. The frequency monitoring load shedding unit comprises a threshold setting module, a frequency monitoring module, an analysis master control module, and a load shedding execution module. The delay timing unit comprises a timing control module and an electronic timing module. The threshold setting module and the frequency monitoring module are both connected to the analysis master control module by signal. The analysis master control module is connected to the timing control module and the load shedding execution module by signal. The threshold setting module is also connected to the timing control module by signal. The timing control module is connected to the electronic timing module by signal. The threshold setting module is used to set the frequency threshold and send the frequency threshold to the analysis master control module. The frequency monitoring module is used to monitor the real-time frequency data during the operation of the power system and transmit the real-time frequency data to the analysis master control module in real time. The analysis master control module is used to receive the frequency threshold and the real-time frequency data and compare the real-time frequency data with the frequency threshold, and control the load shedding execution module to perform the load shedding operation. The load shedding execution module is used to perform the load shedding operation. The threshold setting module is also used to set the duration threshold and send the duration threshold to the timing control module.

[0021] The frequency threshold includes the normal frequency threshold, the delayed frequency threshold, the fast delayed frequency threshold, and the immediate frequency reduction threshold. The duration threshold includes the delayed duration threshold and the fast delayed duration threshold. The normal frequency threshold matches the lowest frequency during normal operation of the power system. The normal frequency threshold, the delayed frequency threshold, the fast delayed frequency threshold, and the immediate frequency reduction threshold decrease in sequence. The delayed duration threshold is greater than the fast delay duration threshold.

[0022] The method for using the intelligent low-frequency load reduction device in this application comprises the following steps: S1. According to the normal operating frequency of the power system, a normal frequency threshold is set through a threshold setting module, and according to the normal frequency threshold and the operation requirements of the power system, a delay frequency threshold, a quick delay frequency threshold, an immediate frequency reduction threshold, a delay time threshold, and a quick delay time threshold are reasonably set through the threshold setting module; S2. When the real-time frequency data is lower than the delay frequency threshold, the analysis master control module will send an instruction to the timing control module to make the delay timing unit perform timing according to the delay time threshold. After the timing time reaches the delay time threshold, the timing control module will send a feedback signal to the analysis master control module. At this time, if the real-time frequency data is still lower than the normal frequency threshold, the analysis master control module will send an instruction to the load shedding execution module to make the load shedding execution module perform the load shedding operation; S3. When the real-time frequency data is lower than the fast-delay frequency threshold, the analysis master control module will send an instruction to the timing control module to make the delay timing unit perform timing according to the fast-delay time threshold. After the timing reaches the fast-delay time threshold, the timing control module will send a feedback signal to the analysis master control module. At this time, if the real-time frequency data is still lower than the normal frequency threshold, the analysis master control module will send an instruction to the load shedding execution module to make the load shedding execution module perform the load shedding operation. S4. When the real-time frequency data is lower than the frequency reduction threshold, the analysis and control module will directly send instructions to the load reduction execution module, so that the load reduction execution module executes the load shedding operation.

[0023] When the operating frequency of the power system is lower than the normal range, the low-frequency load reduction device in the present application will conduct further, comprehensive and intelligent analysis and judgment according to the degree of frequency reduction. It will not only intelligently judge whether to perform load shedding immediately or delay the load shedding according to the degree of frequency reduction, but also perform intelligent delay according to the degree of frequency reduction, thereby avoiding unnecessary load shedding in non-emergency situations, and effectively ensuring that sufficient load can be effectively and quickly sheared off in emergency situations, thereby effectively ensuring the stable operation of the power system.

[0024] In this embodiment, when the delay timing unit performs timing according to the slow delay time threshold or the fast delay time threshold, the timing control module will directly control the electronic timing module to perform timing according to the slow delay time threshold or the fast delay time threshold after receiving the instruction from the analysis control module.

[0025] The second implementation method: Figure 4An intelligent low-frequency load shedding device is shown. Different from the first embodiment, the frequency monitoring load shedding unit also includes a load shedding setting module and an audible and visual alarm. The load shedding setting module is connected to the analysis master control module signal, and the analysis master control module is connected to the audible and visual alarm signal. The load shedding setting module is used to classify the load. The time threshold also includes a reduction time threshold, the reduction time threshold is less than the fast delay time threshold, and the reduction time threshold is less than the fast delay time threshold. In step S1, when setting the slow delay time threshold and the fast delay time threshold, it is also necessary to set the reduction time threshold, and the load is classified by the load shedding setting module, and the load is classified into multiple rounds (the loads of multiple rounds are ranked first in order of importance from low to high). The first, second, third round...), when the analysis control module sends an instruction to the load shedding execution module to enable the load shedding execution module to perform the load shedding operation, the load shedding execution module will shedding the load according to the rounds. After each round of load shedding, the analysis control module will send an instruction to the timing control module to enable the delay timing unit to time according to the time reduction threshold. After the timing reaches the time reduction threshold, the timing control module will send a feedback signal to the analysis control module. At this time, if the real-time frequency data is still lower than the normal frequency threshold, the analysis control module will send an instruction to the load shedding execution module to enable the load shedding execution module to shedding the next round of load, and so on, until the real-time frequency returns to normal.

[0026] The load shedding setting module is also used to set the warning round threshold and the start-up and cut-off round number values ​​and each cut-off round number values ​​corresponding to the frequency threshold. For example, when the warning round threshold is set to the fourth round, the start-up and cut-off round number values ​​corresponding to the fast-delay frequency threshold are set to the second round, and the each cut-off round number values ​​corresponding to the fast-delay frequency threshold are set to the second round, when the load not less than the fourth round is cut off, the analysis and control module will start the sound and light alarm, causing the sound and light alarm to sound an alarm to remind relevant technical personnel. When the real-time frequency data is lower than the fast-delay frequency threshold, the analysis and control module controls the load shedding execution module to cut off the load, and it will directly start cutting from the second round (that is, when the load is cut off for the first time, the loads of the first and second rounds will be directly cut off), and each subsequent time the load is cut off, the loads of two rounds will be cut off at one time. Therefore, through the joint setting of the load shedding setting module, the sound and light alarm, etc., the intelligence, functionality and reliability of the low-frequency load shedding device can be further improved, thereby further ensuring the stable operation of the power system.

[0027] The third implementation method: Figure 5-6An intelligent low-frequency load reduction device is shown. Different from the first and second embodiments, the delay timing unit also includes a delay verification mechanism, which includes a shading verification box 101. A matching shading partition 102 is fixedly installed in the middle of the shading verification box 101 (the shading partition 102 divides the internal space of the shading verification box 101 into two independent and sealed areas), an electric meter flashing light 103 and a rpm flashing light 104 are fixedly installed on the top inner wall of the shading verification box 101, and an electric meter brightness sensor 105 and a rpm brightness sensor 106 are fixedly installed on the bottom inner wall of the shading verification box 101. The shading verification box 101 and the shading partition 102 are made of opaque materials, and the electric meter flashing light 103 and the rpm flashing light 104 are respectively located on the shading partition 10 2, the electric meter brightness sensor 105 and the revolution meter brightness sensor 106 are respectively located on the left and right sides of the shading partition 102, the electric meter brightness sensor 105 is located directly below the electric meter flashing light 103, and the revolution meter brightness sensor 106 is located directly below the revolution meter flashing light 104. The delay verification mechanism also includes a timing motor and a photoelectric encoder arranged on the output end of the timing motor. The delay timing unit also includes a revolution measurement timing module and a timing analysis module. The electronic timing module is connected to the electric meter flashing light 103 by signal, and the timing control module is also connected to the revolution measurement timing module by signal. The photoelectric encoder is connected to the revolution measurement timing module by signal, and the revolution measurement timing module is connected to the revolution meter flashing light 104 and the timing motor by signal. The delay verification mechanism also includes a reminder light, and the revolution measurement timing module is connected to the reminder light by signal.

[0028] The accuracy of the timing function of the delay timing unit is one of the important factors to ensure the reliability of the low-frequency load reduction device. In this embodiment, when the delay timing unit performs timing according to the slow delay time threshold or the fast delay time threshold, after the timing control module receives the instruction from the threshold setting module, it will not only control the electronic timing module to perform timing according to the slow delay time threshold or the fast delay time threshold, but also send a signal to the rotation measurement timing module, so that the rotation measurement timing module starts the timing motor and controls the timing motor to rotate at a speed of 1r / s. In addition, during the timing process of the electronic timing module, the electronic timing module will control the electric meter to flash 103 times per second. Flashes once, the photoelectric encoder can detect the number of revolutions of the timing motor, and the data detected by the photoelectric encoder will be transmitted to the revolution measuring and timing module in real time. Every time the timing motor rotates one circle, the revolution measuring and timing module will control the revolution meter flashing light 104 to flash once. The delay timing unit has two timing means, one is to perform timing through the electronic timing module, and the other is to perform timing by limiting the rotation of the timing motor and detecting the number of revolutions of the timing motor. The two timing means adopt completely different principles and methods and can verify each other. Due to the flashing of the electric meter flashing light 103 and the revolution meter flashing light 104, the brightness of the electric meter will be respectively The brightness data detected by the sensor 105 and the rpm brightness sensor 106 change significantly. The brightness data detected by the electric meter brightness sensor 105 and the rpm brightness sensor 106 will be transmitted to the timing analysis module in real time, so that the timing analysis module can determine whether there are problems with the two timing means by analyzing the brightness data detected by the electric meter brightness sensor 105 and the rpm brightness sensor 106. When the data is abnormal (that is, the brightness data detected by the electric meter brightness sensor 105 and the rpm brightness sensor 106 are not synchronized or there are differences), the rpm timing module will light up the reminder light to remind the relevant technical personnel, prompting the relevant technical personnel to conduct further inspections on the delay timing unit in time and perform corresponding maintenance on the delay timing unit. Therefore, through the joint setting of the delay verification mechanism, the rpm timing module, the timing analysis module, etc., the delay timing unit has two timing means with different principles and methods. The two timing means can be verified with each other, and when a problem with the timing accuracy is found through mutual verification, a reminder will be issued to the relevant technical personnel, prompting the technical personnel to perform corresponding processing in time, thereby greatly improving the accuracy and reliability of the timing function of the delay timing unit, and further ensuring the stable operation of the power system.

[0029] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An intelligent low-frequency load reduction device, characterized in that: It includes a frequency monitoring and load shedding unit and a delay timing unit. The frequency monitoring and load shedding unit includes a threshold setting module, a frequency monitoring module, an analysis and control module, and a load shedding execution module. The delay timing unit includes a timing control module and an electronic timing module. The threshold setting module and the frequency monitoring module are both connected to the analysis master control module by signal, the analysis master control module is connected to the timing control module and the load reduction execution module by signal, the threshold setting module is also connected to the timing control module by signal, and the timing control module is connected to the electronic timing module by signal; The threshold setting module is used to set the frequency threshold and send the frequency threshold to the analysis and control module. The frequency monitoring module is used to monitor the real-time frequency data during the operation of the power system and transmit the real-time frequency data to the analysis and control module in real time. The analysis and control module is used to receive the frequency threshold and the real-time frequency data and compare the real-time frequency data with the frequency threshold, and control the load shedding execution module to perform the load shedding operation. The load shedding execution module is used to perform the load shedding operation. The threshold setting module is also used to set the duration threshold and send the duration threshold to the timing control module.

2. The intelligent low-frequency load reduction device according to claim 1, characterized in that: The frequency threshold includes a normal frequency threshold, a delayed frequency threshold, a fast delayed frequency threshold, and an immediate frequency reduction threshold. The duration threshold includes a delayed duration threshold and a fast delayed duration threshold. The normal frequency threshold matches the lowest frequency during normal operation of the power system. The normal frequency threshold, the delayed frequency threshold, the fast delayed frequency threshold, and the immediate frequency reduction threshold decrease in sequence. The delayed duration threshold is greater than the fast delay duration threshold.

3. The intelligent low-frequency load reduction device according to claim 2, characterized in that: The method of use includes the following steps: S1. According to the normal operating frequency of the power system, a normal frequency threshold is set through a threshold setting module, and according to the normal frequency threshold and the operation requirements of the power system, a delay frequency threshold, a quick delay frequency threshold, an immediate frequency reduction threshold, a delay time threshold, and a quick delay time threshold are reasonably set through the threshold setting module; S2. When the real-time frequency data is lower than the delay frequency threshold, the analysis master control module will send an instruction to the timing control module to make the delay timing unit perform timing according to the delay time threshold. After the timing time reaches the delay time threshold, the timing control module will send a feedback signal to the analysis master control module. At this time, if the real-time frequency data is still lower than the normal frequency threshold, the analysis master control module will send an instruction to the load shedding execution module to make the load shedding execution module perform the load shedding operation; S3. When the real-time frequency data is lower than the fast-delay frequency threshold, the analysis master control module will send an instruction to the timing control module to make the delay timing unit perform timing according to the fast-delay time threshold. After the timing reaches the fast-delay time threshold, the timing control module will send a feedback signal to the analysis master control module. At this time, if the real-time frequency data is still lower than the normal frequency threshold, the analysis master control module will send an instruction to the load shedding execution module to make the load shedding execution module perform the load shedding operation. S4. When the real-time frequency data is lower than the frequency reduction threshold, the analysis and control module will directly send instructions to the load reduction execution module, so that the load reduction execution module executes the load shedding operation.

4. The intelligent low-frequency load reduction device according to claim 3, characterized in that: The frequency monitoring load shedding unit also includes a load shedding setting module and an audible and visual alarm. The load shedding setting module is connected to the analysis and general control module signal, and the analysis and general control module is connected to the audible and visual alarm signal. The load shedding setting module is used to classify the load, and the duration threshold also includes a load shedding duration threshold.

5. The intelligent low-frequency load reduction device according to claim 4, characterized in that: The time reduction threshold is smaller than the time delay threshold. In step S1, when setting the time delay threshold and the time delay threshold, the time reduction threshold also needs to be set. The load is graded into multiple rounds through the load reduction setting module.

6. The intelligent low-frequency load reduction device according to claim 1, characterized in that: The delay timing unit also includes a time delay verification mechanism, which includes a light-shielding verification box (101), a light-shielding partition (102) matching the light-shielding verification box (101) is fixedly installed in the middle of the light-shielding verification box (101), an electric meter flashing light (103) and a revolution meter flashing light (104) are fixedly installed on the top inner wall of the light-shielding verification box (101), and an electric meter brightness sensor (105) and a revolution meter brightness sensor (106) are fixedly installed on the bottom inner wall of the light-shielding verification box (101).

7. The intelligent low-frequency load reduction device according to claim 6, characterized in that: The light-shielding verification box (101) and the light-shielding partition (102) are both made of opaque materials; the electric meter flashing light (103) and the revolution meter flashing light (104) are respectively located on the left and right sides of the light-shielding partition (102); the electric meter brightness sensor (105) and the revolution meter brightness sensor (106) are respectively located on the left and right sides of the light-shielding partition (102); the electric meter brightness sensor (105) is located directly below the electric meter flashing light (103); and the revolution meter brightness sensor (106) is located directly below the revolution meter flashing light (104).

8. The intelligent low-frequency load reduction device according to claim 6, characterized in that: The time delay verification mechanism also includes a timing motor and a photoelectric encoder arranged on the output end of the timing motor. The delay timing unit also includes a rotation measurement timing module and a timing analysis module. The electronic timing module is connected to the electric meter flashing light (103) by signal. The timing control module is also connected to the rotation measurement timing module by signal. The photoelectric encoder is connected to the rotation measurement timing module by signal. The rotation measurement timing module is connected to the rotation meter flashing light (104) and the timing motor by signal.

9. The intelligent low-frequency load reduction device according to claim 8, characterized in that: The time delay verification mechanism also includes a reminder light, and the revolution measurement and timing module is connected to the reminder light signal.

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