Protection method, device and equipment of frequency converter cabinet and medium

Abstract

The invention discloses a protection method, device and equipment of a frequency converter cabinet and a medium, and belongs to the technical field of metallurgy. The method comprises the following steps: acquiring the temperature in the frequency converter cabinet and the production line speed of the production line; if the temperature is larger than or equal to a preset first temperature threshold value and the production line speed is larger than a preset speed threshold value, the draught fan is controlled to be started; if the temperature is smaller than a preset second temperature threshold value or the production line speed is smaller than or equal to the speed threshold value, the fan is controlled to stop; wherein the first temperature threshold value is greater than the second temperature threshold value. According to the method, the draught fan can be installed on the frequency converter cabinet, the temperature in the frequency converter cabinet is adjusted through the draught fan, the temperature of the frequency converter can be adjusted more effectively, the time for starting and stopping the draught fan is determined according to the temperature in the frequency converter cabinet and the condition of a production line, the heat dissipation effect in the frequency converter cabinet can be guaranteed, and energy consumption can be saved.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and in particular to a protection method, device, equipment and medium for a frequency converter cabinet. Background Technology

[0002] A variable frequency drive (VFD) cabinet is an electrical cabinet used in industrial automation for the centralized installation, control, and protection of frequency converters and their associated equipment. The VFD regulates the frequency and voltage of the motor power supply, achieving precise control of the motor speed.

[0003] In existing technologies, fans, air conditioners, and other equipment are installed in the inverter room. The fans carry the heat from the inverter cabinet to other areas of the room through airflow, and the air conditioners use their cooling function to lower the indoor temperature to a suitable range, thereby meeting the heat dissipation requirements of the inverter cabinet.

[0004] However, the above-mentioned heat dissipation methods have poor heat dissipation effect, and sometimes the temperature of the inverter cabinet cannot meet the requirements, affecting the normal operation of the inverter. Summary of the Invention

[0005] In view of the above problems, this application is made to provide a protection method, device, equipment and medium for inverter cabinets that solves the above problems. A fan can be installed on the inverter cabinet to regulate the temperature inside the inverter cabinet, which can more effectively regulate the temperature of the inverter. At the same time, the start and stop times of the fan can be determined according to the temperature inside the inverter cabinet and the production line conditions, which can not only ensure the heat dissipation effect inside the inverter cabinet, but also save energy.

[0006] In a first aspect, this application provides a protection method for a frequency converter cabinet, wherein a frequency converter is arranged inside the frequency converter cabinet, a fan is arranged on the frequency converter cabinet, the air inlet and air outlet of the fan are respectively inside and outside the frequency converter cabinet, and the output terminal of the frequency converter is electrically connected to a production line, the method comprising:

[0007] The temperature inside the inverter cabinet and the production line speed of the production line are obtained.

[0008] If the temperature is greater than or equal to a preset first temperature threshold and the production line speed is greater than a preset speed threshold, then the fan is controlled to start.

[0009] If the temperature is less than a preset second temperature threshold or the production line speed is less than or equal to the speed threshold, then the fan is controlled to stop.

[0010] Wherein, the first temperature threshold is greater than the second temperature threshold.

[0011] Optionally, the inverter cabinet is provided with an air inlet, and the air inlet is embedded with a filter screen. After the fan is started, the method further includes:

[0012] Obtain the pressure difference between the inside and outside of the filter screen;

[0013] Calculate the temperature difference between the stated temperature and the first temperature threshold;

[0014] The fan speed is adjusted according to the temperature difference, the production line speed, and the pressure difference, all of which are positively correlated with the fan speed.

[0015] Optionally, after obtaining the pressure difference between the inside and outside of the filter, the method further includes:

[0016] If the differential pressure is greater than a preset differential pressure threshold, a prompt message will be displayed to remind maintenance personnel to clean the filter.

[0017] Optionally, adjusting the fan speed based on the temperature difference, the production line speed, and the pressure difference includes:

[0018] Calculate the temperature difference range in which the temperature difference lies, and determine the first speed increase value corresponding to the temperature difference range;

[0019] Determine the speed range in which the difference between the production line speed and the preset speed threshold lies, and determine the second speed increase value corresponding to the speed range;

[0020] Determine the pressure difference range in which the difference between the pressure difference and the preset pressure difference threshold lies, and determine the third rotational speed increase value corresponding to the pressure difference range;

[0021] Calculate the sum of the first speed increase, the second speed increase, and the third speed increase to obtain the total speed increase.

[0022] Increase the total increase in the rotational speed of the fan by the total increase in rotational speed.

[0023] Optionally, the inverter cabinet door is equipped with a door lock, and the method further includes:

[0024] If the cabinet door switches from the closed state to the open state without receiving an opening command or detecting an unlocking action, an alarm will be triggered.

[0025] The door opening command is sent by the door lock when it recognizes the identity authentication card and the correct password.

[0026] Optionally, after obtaining the temperature inside the inverter cabinet and the production line speed of the production line, the method further includes:

[0027] Determine the rate of temperature rise based on the stated temperature;

[0028] If the temperature rise rate is greater than a preset first rate threshold and less than a preset second rate threshold, then the load on the frequency converter is reduced.

[0029] If the temperature rise rate is greater than or equal to the second rate threshold and less than the preset third rate threshold, then the fan is controlled to run at maximum speed.

[0030] If the temperature rise rate is greater than or equal to the third rate threshold, then the power supply to the inverter cabinet is cut off.

[0031] Optionally, the method further includes:

[0032] Obtain the input current of the frequency converter;

[0033] If the input current is greater than a preset current threshold, the fan is controlled to start.

[0034] Secondly, this application provides a protective device for a frequency converter cabinet, wherein a frequency converter is arranged inside the frequency converter cabinet, a fan is arranged on the frequency converter cabinet, the air inlet and air outlet of the fan are respectively inside and outside the frequency converter cabinet, and the output terminal of the frequency converter is electrically connected to the production line. The device includes:

[0035] The first acquisition module is used to acquire the temperature inside the inverter cabinet and the production line speed of the production line.

[0036] The first control module is used to control the fan to start if the temperature is greater than or equal to a preset first temperature threshold and the production line speed is greater than a preset speed threshold.

[0037] The second control module is used to control the fan to stop if the temperature is less than a preset second temperature threshold or the production line speed is less than or equal to the speed threshold.

[0038] Wherein, the first temperature threshold is greater than the second temperature threshold.

[0039] Thirdly, this application provides an electronic device, including: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method as described in the first aspect.

[0040] Fourthly, this application provides a computer-readable storage medium storing computer instructions for causing the computer to perform the method described in the first aspect.

[0041] The technical solutions provided in this application embodiment have at least the following technical effects or advantages:

[0042] This application provides a protection method, device, equipment, and medium for a frequency converter cabinet. It can acquire the temperature inside the frequency converter cabinet and the production line speed to understand the working environment of the frequency converter. If the temperature is greater than or equal to a preset first temperature threshold and the production line speed is greater than a preset speed threshold, the fan is started to cool the cabinet when the frequency converter temperature is high and the load is heavy. If the temperature is less than or equal to a preset second temperature threshold or the production line speed is less than or equal to the speed threshold, the fan is stopped to save energy when the frequency converter temperature is not high or the load is light. Furthermore, the first temperature threshold being greater than the second temperature threshold avoids frequent fan starts. This method allows for the installation of a fan on the frequency converter cabinet to regulate the temperature inside, thus more effectively controlling the frequency converter temperature. Furthermore, by determining when to start and stop the fan based on the temperature inside the cabinet and the production line conditions, it not only ensures effective heat dissipation within the frequency converter cabinet but also saves energy.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0045] Figure 1 This is a structural schematic diagram of a frequency converter cabinet provided in an embodiment of this application;

[0046] Figure 2 This is a flowchart of a protection method for a frequency converter cabinet provided in an embodiment of this application;

[0047] Figure 3 This is a structural block diagram of a protective device for a frequency converter cabinet provided in an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. Unless otherwise specified, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0049] Before providing a detailed description of the inverter cabinet protection method provided in the embodiments of this application, a brief introduction to the relevant implementation environment will be given first. Figure 1 This is a structural schematic diagram of a frequency converter cabinet provided in an embodiment of this application, as shown below. Figure 1 As shown, inverter cabinet 1 houses inverters (not shown in the figure), and a fan 2 is mounted on top of it. The fan 2 has its inlet and outlet located inside and outside the inverter cabinet, respectively. The inverter's output is electrically connected to the production line. An air inlet with a filter 3 is embedded in the bottom of inverter cabinet 1. The inverter is used to regulate the frequency of the input power supply to the production line. The fan 2 promotes air circulation within inverter cabinet 1. The filter 3 filters the air entering inverter cabinet 1.

[0050] Fan 2 can be installed at the center of the top of the cabinet, with its air outlet vertically upwards and tightly connected to the cabinet via a sealing flange. When fan 2 starts running, it creates a negative pressure environment inside the cabinet. Based on the principle of airflow, outside air flows in from the air inlet at the bottom of the cabinet, passes through the inverter's heat sink, absorbs heat, and is then discharged from the air outlet at the top, thus forming a unidirectional airflow channel of "bottom in, top out". This unique airflow organization method can prevent dust from accumulating in the heat dissipation channel, ensuring both good heat dissipation and dust prevention.

[0051] The filter can be a dual-layer dust filter. The outer layer is a large filter with a mesh diameter between 1-2mm, and it uses a detachable frame for installation. Its advantage is that inspectors can directly observe larger foreign objects such as fibers and particles attached to the filter and clean them quickly. The inner layer is a small filter, using a HEPA (High-Efficiency Particulate Air) filter, which further blocks fine dust. Through the graded protection of the outer coarse filtration layer and the inner fine filtration layer, highly efficient dust prevention is achieved.

[0052] Figure 2 This is a flowchart of a protection method for a frequency converter cabinet provided in an embodiment of this application, such as... Figure 2 As shown, the method includes:

[0053] Step S210: Obtain the temperature inside the inverter cabinet and the production line speed of the production line.

[0054] In this embodiment, temperature sensors can be arranged inside the inverter cabinet to detect the temperature inside the cabinet. Multiple temperature sensors can be arranged on the top, middle, and bottom layers of the cabinet, 10cm away from the heating element. The average of the detected temperatures is taken as the temperature inside the inverter cabinet. The temperature sensor model can be selected as PT100 (accuracy ±0.3℃).

[0055] The production line speed can be obtained from the production line control system. The production line speed can reflect the production status of the production line, and thus reflect the load status of the frequency converter.

[0056] Step S220: If the temperature is greater than or equal to the preset first temperature threshold and the production line speed is greater than the preset speed threshold, then control the fan to start.

[0057] In this embodiment, if the temperature is greater than or equal to a preset first temperature threshold, it indicates that the temperature inside the inverter cabinet is too high. If the production line speed is greater than a preset speed threshold, it indicates that the production intensity of the production line is high and the load on the inverter is high. At this time, it is necessary to turn on the fan to cool down. By using the fan on the inverter cabinet to adjust the temperature inside the inverter, a better adjustment effect can be achieved, so that the temperature of the inverter can quickly meet the requirements.

[0058] Step S230: If the temperature is less than the preset second temperature threshold or the production line speed is less than or equal to the speed threshold, then control the fan to stop.

[0059] In this embodiment, if the temperature is less than a preset second temperature threshold, it indicates that the temperature inside the inverter cabinet is low; if the production line speed is less than or equal to a speed threshold, it indicates that the production intensity of the production line is low. If either condition is met, the fan is stopped, and the temperature inside the inverter cabinet is no longer adjusted, thus saving energy. The intelligent monitoring system, combining production line speed and temperature parameters, enables the fan to start and stop on demand, saving electricity and achieving intelligent energy saving.

[0060] Specifically, the system starts controlling the fan to stop when the temperature is lower than a preset second temperature threshold or when the production line speed is lower than or equal to a speed threshold, and after a set time, the fan is controlled to stop. In other words, the fan is controlled to delay for a set time before stopping; the set time can be set from 0 to 60 seconds.

[0061] The first temperature threshold is greater than the second temperature threshold.

[0062] In this embodiment, to avoid frequent fan starts and reduced lifespan, the temperature thresholds for fan start-up and shutdown are set differently. For example, the first temperature threshold is 28°C, the second temperature threshold is 25°C, and the speed threshold is 0.

[0063] Optionally, after step S220, the method further includes:

[0064] The first step is to obtain the pressure difference between the inside and outside of the filter screen.

[0065] In this embodiment, differential pressure transmitters are installed on the inner and outer sides of the filter screen to detect the pressure difference between the inner and outer sides of the filter screen. The differential pressure transmitter's pressure tap diameter can be 6mm, its length ≤1.5m, and its range 0-500Pa.

[0066] Optionally, after the first step, the method may also include:

[0067] Step 4: If the differential pressure is greater than the preset differential pressure threshold, a prompt message will be displayed to remind maintenance personnel to clean the filter.

[0068] In this embodiment, if the differential pressure exceeds a preset differential pressure threshold, it indicates that the differential pressure is too high and the filter may be clogged. A prompt message is then displayed to remind maintenance personnel to clean the filter, and a text message can be sent to the maintenance personnel's mobile phone. The differential pressure threshold can be 200 Pa. This automatic generation of filter maintenance reminders reduces manual inspection costs and achieves intelligent operation and maintenance.

[0069] The second step is to calculate the temperature difference between the temperature and the first temperature threshold.

[0070] In this embodiment of the application, the difference between the current temperature and the first temperature threshold can be used to determine how many degrees the current temperature has increased compared to the first temperature threshold.

[0071] The third step is to adjust the fan speed according to the temperature difference, production line speed, and pressure difference. The temperature difference, production line speed, and pressure difference are all positively correlated with the fan speed.

[0072] In this embodiment, the fan speed is adjusted based on the temperature rise, the degree of filter clogging, and the production line operation. A greater temperature difference results in a greater temperature rise, allowing for a higher fan speed; a greater pressure difference leads to more severe filter clogging, requiring a higher fan speed; and a faster production line operation and higher load necessitate a higher fan speed for heat dissipation.

[0073] Optional, the third step includes:

[0074] Calculate the temperature difference range and determine the first speed increase value corresponding to the temperature difference range; determine the speed range where the difference between the production line speed and the preset speed threshold is located, and determine the second speed increase value corresponding to the speed range; determine the pressure difference range where the difference between the pressure difference and the preset pressure difference threshold is located, and determine the third speed increase value corresponding to the pressure difference range; calculate the sum of the first speed increase value, the second speed increase value, and the third speed increase value to obtain the total speed increase value; increase the fan speed by the total speed increase value.

[0075] In this embodiment, a first correspondence between the temperature difference range and the first speed increase, a second correspondence between the speed range and the second speed increase, and a third correspondence between the pressure difference range and the third speed increase can be pre-defined. Therefore, after calculating the temperature difference, the first speed increase corresponding to the temperature difference range can be found based on the first correspondence. Similarly, the second and third speed increases can be found. The sum of the first, second, and third speed increases is then used as the total speed increase, controlling the fan to operate at the sum of the initial speed and the total speed increase. The initial speed can be the fan speed when it is first started.

[0076] This can be understood as follows: for every certain increase in temperature, pressure difference, or production line speed, the fan speed will increase by a certain amount. For example, for every 2°C increase in temperature or every 50Pa increase in pressure difference, the fan speed will increase by 10%; for every 100m / min increase in production line speed, the speed will increase by an additional 5%. The speed adjustment range is 200-1400rpm.

[0077] In this embodiment, the fan includes a main fan and a backup fan. When the main fan fails, the backup fan automatically switches in. If the switching fails three times in a row, the system is locked and an alarm is triggered.

[0078] Optionally, the inverter cabinet door is equipped with a door lock; other methods include:

[0079] If the cabinet door switches from the closed state to the open state without receiving an opening command or detecting an unlocking action, an alarm will be triggered.

[0080] The door opening command is sent by the door lock when it recognizes the identity authentication card and the correct password.

[0081] In this embodiment, the door lock employs a physical interlocking layer, with a magnetic protective cover. The cover houses an infrared beam sensor; when someone opens the cover to unlock the lock, the sensor detects the unlocking action. The lock requires an authentication card and a correct password to trigger the opening command and open the cabinet door. If no opening command is received or no unlocking action is detected, but the cabinet door switches from closed to open, it indicates abnormal opening, triggering an audible and visual alarm. This multi-layered anti-misoperation system prevents unauthorized operation of the cabinet door through physical locking, electrical interlocking, and access authentication.

[0082] The magnetic protective cover is transparent and made of 5mm acrylic sheet. Eight magnetic blocks (with a magnetic force ≥50N) are embedded in the edge, and an infrared beam sensor (model E3F-DS30C4) is installed on both sides of the cover.

[0083] Optionally, after step S210, the method further includes:

[0084] Based on the temperature, determine the temperature rise rate; if the temperature rise rate is greater than or equal to the preset first rate threshold and less than the preset second rate threshold, reduce the load on the frequency converter; if the temperature rise rate is greater than or equal to the second rate threshold and less than the preset third rate threshold, control the fan to run at maximum speed; if the temperature rise rate is greater than or equal to the third rate threshold, cut off the power supply to the frequency converter cabinet.

[0085] In this embodiment of the application, in order to prevent thermal runaway of the frequency converter, a thermal runaway handling mechanism can be adopted, which is triggered by the temperature rise rate.

[0086] Specifically, if the temperature rise rate is greater than a preset first rate threshold but less than a preset second rate threshold, it indicates a slightly high temperature rise rate, triggering a first-level processing mechanism. This involves reducing the inverter's load, for example, by derating it by 20%, thereby lowering the inverter's temperature. If the temperature rise rate is greater than or equal to the second rate threshold but less than a preset third rate threshold, it indicates a high temperature rise rate, triggering a second-level processing mechanism. This involves controlling the fan to run at maximum speed for full-speed cooling, and alarm information can be displayed on the human-machine interface. If the temperature rise rate is greater than or equal to the third rate threshold, it indicates a very high temperature rise rate, triggering a third-level processing mechanism. This involves cutting off the power supply to the inverter cabinet, causing the inverter to stop working and preventing thermal runaway. This temperature rise rate-based thermal runaway early warning system improves equipment reliability.

[0087] Optionally, the method also includes:

[0088] Obtain the input current of the frequency converter; if the input current is greater than the preset current threshold, control the fan to start.

[0089] In this embodiment, a current sensor can also be installed on the copper busbar on the input side of the frequency converter. The current sensor detects the input current of the frequency converter and outputs a 4-20mA signal to the analog module of the controller. The analog module then converts the 4-20mA signal into an input current. The current sensor can be a Hall effect current sensor (measurement range 0-500A).

[0090] In this embodiment, data such as temperature, production line speed, pressure difference, and input current need to be filtered before use. By combining temperature, input current, production line speed, and filter pressure difference to dynamically adjust the start / stop and speed of the fan, intelligent control of the fan with multiple parameters is achieved.

[0091] The embodiments of this application can:

[0092] Energy saving and consumption reduction: The fan speed can be adjusted as needed, saving an average of 6,075 kWh of electricity per year (calculated based on 30 1.5kW fans), which is equivalent to about 54,670 yuan in electricity costs;

[0093] Reduced failures: Thermal runaway warning reduces the number of downtimes by 70%, and with a single failure loss of 80,000 yuan, annual savings amount to 560,000 yuan.

[0094] Maintenance costs: The filter cleaning cycle is extended from 15 days to 45 days, reducing annual labor maintenance costs by 24,000 yuan;

[0095] Industry applicability: It can be replicated to high-voltage cabinets and PLC control cabinets in industries such as metallurgy, chemical industry, and papermaking. Different equipment can be adapted by modifying the PLC parameters.

[0096] Safety Enhancement: Through a triple anti-misoperation system, the risk of electric shock to operators is reduced by 90%, meeting the safety requirements of GB 50174-2017 "Data Center Design Code".

[0097] Based on the same concept, embodiments of the present invention also provide a protective device for a frequency converter cabinet. Figure 3 This is a structural block diagram of a protective device for a frequency converter cabinet provided in an embodiment of this application, as shown below. Figure 3 As shown, the device 300 includes an acquisition module 301, a first control module 302, and a second control module 303.

[0098] The first acquisition module 301 is used to acquire the temperature inside the inverter cabinet and the production line speed of the production line.

[0099] The first control module 302 is used to control the fan to start if the temperature is greater than or equal to a preset first temperature threshold and the production line speed is greater than a preset speed threshold.

[0100] The second control module 303 is used to control the fan to stop if the temperature is less than or equal to a preset second temperature threshold or the production line speed is less than or equal to a speed threshold.

[0101] The first temperature threshold is greater than the second temperature threshold.

[0102] Optionally, the device also includes:

[0103] The second acquisition module is used to acquire the pressure difference between the inside and outside of the filter screen;

[0104] The calculation module is used to calculate the temperature difference between the temperature and the first temperature threshold.

[0105] The adjustment module is used to adjust the fan speed according to the temperature difference, production line speed, and pressure difference. The temperature difference, production line speed, and pressure difference are all positively correlated with the speed.

[0106] Optionally, the device also includes:

[0107] The display module is used to display a prompt message if the differential pressure is greater than the preset differential pressure threshold. The prompt message is used to remind maintenance personnel to clean the filter.

[0108] Optionally, the adjustment module is also used for:

[0109] Calculate the temperature difference range within which the temperature difference exists, and determine the first speed increase value corresponding to the temperature difference range;

[0110] Determine the speed range in which the difference between the production line speed and the preset speed threshold lies, and determine the second speed increase value corresponding to the speed range;

[0111] Determine the pressure difference range containing the difference between the pressure difference and the preset pressure difference threshold, and determine the third speed increase value corresponding to the pressure difference range;

[0112] Calculate the sum of the first speed increase, the second speed increase, and the third speed increase to obtain the total speed increase;

[0113] Increase the fan speed by the total increase in speed.

[0114] Optionally, the inverter cabinet door is equipped with a door lock, and the device also includes an alarm module for:

[0115] If the cabinet door switches from the closed state to the open state without receiving an opening command or detecting an unlocking action, an alarm will be triggered.

[0116] The door opening command is sent by the door lock when it recognizes the identity authentication card and the correct password.

[0117] Optionally, the device includes a third control module for:

[0118] Determine the rate of temperature rise based on the temperature.

[0119] If the rate of temperature rise is greater than the preset first rate threshold but less than the preset second rate threshold, then reduce the load on the frequency converter.

[0120] If the temperature rise rate is greater than or equal to the second rate threshold and less than the preset third rate threshold, the fan is controlled to run at maximum speed.

[0121] If the temperature rise rate is greater than or equal to the third rate threshold, the power supply to the inverter cabinet will be cut off.

[0122] Optionally, the device also includes a fourth control module for:

[0123] Obtain the input current of the frequency converter;

[0124] If the input current is greater than the preset current threshold, the fan will be started.

[0125] It is understood that the device provided in the above embodiments is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0126] This invention also provides an electronic device that may include a processor and a memory, wherein the processor and the memory may be interconnected via a bus or other means.

[0127] The processor can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application. Alternatively, it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or other chips, or combinations of the above types of chips.

[0128] Memory may include mass storage for data or instructions. For example, and not limitingly, memory may include hard disk drives (HDDs), floppy disk drives, flash memory, optical disks, magneto-optical disks, magnetic tape, or Universal Serial Bus (USB) drives, or combinations of two or more of these. Where appropriate, memory may include removable or non-removable (or fixed) media. Where appropriate, memory may be internal or external to an electronic device. In a particular embodiment, memory may be non-volatile solid-state memory.

[0129] In one instance, the memory may be read-only memory (ROM). In one instance, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0130] The processor reads and executes computer program instructions stored in the memory to implement any of the inverter cabinet protection methods in the above embodiments.

[0131] In one example, the electronic device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus to communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or equipment in the embodiments of this application. Where appropriate, the bus may include one or more buses.

[0132] Furthermore, in conjunction with the inverter cabinet protection methods in the above embodiments, this invention can be implemented using a computer-readable storage medium. This computer-readable storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the inverter cabinet protection methods in the above embodiments.

[0133] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. The storage medium can be read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0134] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0135] This application provides a protection method, device, equipment, and medium for a frequency converter cabinet. It can acquire the temperature inside the frequency converter cabinet and the production line speed to understand the working environment of the frequency converter. If the temperature is greater than or equal to a preset first temperature threshold and the production line speed is greater than a preset speed threshold, the fan is started to cool the cabinet when the frequency converter temperature is high and the load is heavy. If the temperature is less than or equal to a preset second temperature threshold or the production line speed is less than or equal to the speed threshold, the fan is stopped to save energy when the frequency converter temperature is not high or the load is light. Furthermore, the first temperature threshold being greater than the second temperature threshold avoids frequent fan starts. This method allows for the installation of a fan on the frequency converter cabinet to regulate the temperature inside, thus more effectively controlling the frequency converter temperature. Furthermore, by determining when to start and stop the fan based on the temperature inside the cabinet and the production line conditions, it not only ensures effective heat dissipation within the frequency converter cabinet but also saves energy.

[0136] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0137] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0138] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A protection method for a frequency converter cabinet, characterized in that, A frequency converter is arranged inside a frequency converter cabinet, and a fan is arranged on the frequency converter cabinet. The air inlet and air outlet of the fan are respectively inside and outside the frequency converter cabinet. The output terminal of the frequency converter is electrically connected to the production line. The method includes: The temperature inside the inverter cabinet and the production line speed of the production line are obtained. If the temperature is greater than or equal to a preset first temperature threshold and the production line speed is greater than a preset speed threshold, then the fan is controlled to start. If the temperature is less than a preset second temperature threshold or the production line speed is less than or equal to the speed threshold, then the fan is controlled to stop. Wherein, the first temperature threshold is greater than the second temperature threshold.

2. The protection method for the frequency converter cabinet according to claim 1, characterized in that, The inverter cabinet has an air inlet, and the air inlet has an embedded filter. After the fan is started, the method further includes: Obtain the pressure difference between the inside and outside of the filter screen; Calculate the temperature difference between the stated temperature and the first temperature threshold; The fan speed is adjusted according to the temperature difference, the production line speed, and the pressure difference, all of which are positively correlated with the fan speed.

3. The protection method for the frequency converter cabinet according to claim 2, characterized in that, After obtaining the pressure difference between the inside and outside of the filter screen, the method further includes: If the differential pressure is greater than a preset differential pressure threshold, a prompt message will be displayed to remind maintenance personnel to clean the filter.

4. The protection method for the frequency converter cabinet according to claim 3, characterized in that, The step of adjusting the fan speed based on the temperature difference, the production line speed, and the pressure difference includes: Calculate the temperature difference range in which the temperature difference lies, and determine the first speed increase value corresponding to the temperature difference range; Determine the speed range in which the difference between the production line speed and the preset speed threshold lies, and determine the second speed increase value corresponding to the speed range; Determine the pressure difference range in which the difference between the pressure difference and the preset pressure difference threshold lies, and determine the third rotational speed increase value corresponding to the pressure difference range; Calculate the sum of the first speed increase, the second speed increase, and the third speed increase to obtain the total speed increase. Increase the total increase in the rotational speed of the fan by the total increase in rotational speed.

5. The protection method for the frequency converter cabinet according to claim 1, characterized in that, The inverter cabinet door is equipped with a door lock, and the method further includes: If the cabinet door switches from the closed state to the open state without receiving an opening command or detecting an unlocking action, an alarm will be triggered. The door opening command is sent by the door lock when it recognizes the identity authentication card and the correct password.

6. The protection method for the frequency converter cabinet according to claim 1, characterized in that, After obtaining the temperature inside the inverter cabinet and the production line speed of the production line, the method further includes: Determine the rate of temperature rise based on the stated temperature; If the temperature rise rate is greater than a preset first rate threshold and less than a preset second rate threshold, then the load on the frequency converter is reduced. If the temperature rise rate is greater than or equal to the second rate threshold and less than the preset third rate threshold, then the fan is controlled to run at maximum speed. If the temperature rise rate is greater than or equal to the third rate threshold, then the power supply to the inverter cabinet is cut off.

7. The protection method for the frequency converter cabinet according to claim 1, characterized in that, The method further includes: Obtain the input current of the frequency converter; If the input current is greater than a preset current threshold, the fan is controlled to start.

8. A protective device for a frequency converter cabinet, characterized in that, A frequency converter is arranged inside a frequency converter cabinet, and a fan is arranged on the frequency converter cabinet. The air inlet and air outlet of the fan are located inside and outside the frequency converter cabinet, respectively. The output terminal of the frequency converter is electrically connected to the production line. The device includes: The first acquisition module is used to acquire the temperature inside the inverter cabinet and the production line speed of the production line. The first control module is used to control the fan to start if the temperature is greater than or equal to a preset first temperature threshold and the production line speed is greater than a preset speed threshold. The second control module is used to control the fan to stop if the temperature is less than a preset second temperature threshold or the production line speed is less than or equal to the speed threshold. Wherein, the first temperature threshold is greater than the second temperature threshold.

9. An electronic device, characterized in that, include: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method of any one of claims 1-7.

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