CN114884430A - Speed detection method, device, equipment and medium for steelmaking converter - Google Patents

Abstract

The application relates to the technical field of metallurgy, and discloses a speed detection method, a speed detection device, speed detection equipment and a speed detection medium for a steelmaking converter. The method comprises the following steps: receiving a working instruction, sending a given speed and a current output by a main frequency converter to the main frequency converter according to the working instruction, obtaining exciting current feedback according to the current output by the main frequency converter and vector calculation of the main frequency converter, and obtaining a motor parameter and an internal fixed model of the main frequency converter through the main frequency converter to obtain a given exciting current; acquiring speed feedback detected by an encoder connected with the main frequency converter; judging whether the speed feedback is abnormal or not according to the output current, the exciting current given value, the exciting current feedback, the output torque, the speed given value and the speed feedback; and if the speed feedback is abnormal, sending an abnormal prompt. The method and the device can judge whether the feedback numerical value of the encoder is correct or not in advance, accurately and timely.

Description

A speed detection method, device, equipment and medium for a steel-making converter

technical field

The present application relates to the field of metallurgical technology, in particular, to a speed detection method, device, equipment and medium for a steelmaking converter.

Background technique

The steelmaking converter is heavily loaded and changes all the time, and the direction of the load also changes. During the operation, it starts and brakes frequently, with multiple speed switching and short time. The converter is driven by four identical frequency converters to drive identical motors. It adopts torque master-slave control, one master and three slaves. The main inverter corresponds to the main motor, and the slave inverter corresponds to the slave motor. One is the master (slave) and the other is the slave (master). Only the master inverter receives the speed given by the PLC and the speed feedback from the encoder, forming a closed speed loop, and the slave inverter receives the torque of the master inverter as the given torque, and drives the slave motor to run, forming a torque closed loop, and the slave inverter The speed varies with the torque from the inverter. In this case, when the speed detection of the encoder of the main inverter is abnormal, the current method still takes a long time to determine the abnormality of the encoder, and it is necessary to filter out the overshoot and time at the time of starting and stopping, which makes the The alarm of speed detection is delayed, and the alarm is not timely and accurate. In order to judge the abnormal speed detected by the encoder more quickly, this method is designed. The transformation of the current can judge the abnormality of the encoder more quickly and accurately, so as to avoid the accident that the molten steel of the converter is poured from the intersection.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a speed detection method, device, equipment and medium for a steelmaking converter, so as to improve the accuracy of the detection speed, thereby avoiding the accident of pouring molten steel from the furnace mouth of the converter.

Other features and advantages of the present application will become apparent from the following detailed description, or be learned in part by practice of the present application.

According to an aspect of the embodiments of the present application, there is provided a speed detection method for a steel-making converter, wherein the steel-making converter includes a master inverter, at least one slave inverter connected to the master inverter, and the master inverter An encoder is connected to at least one slave inverter, the slave inverter receives the output torque of the master inverter, and the method includes: receiving a work instruction, and sending the master inverter according to the work instruction. The speed is given, the output current of the main inverter, according to the output current of the main inverter, the vector calculation of the main inverter, the excitation current feedback is obtained, and the excitation current is obtained through the main inverter to obtain the motor parameters and the internal fixed model of the main inverter. The speed feedback detected by the encoder connected to the main frequency converter; according to the output current, excitation current given, excitation current feedback, output torque, speed given and speed feedback to determine whether the speed feedback is abnormal; if all If the speed feedback is abnormal, an abnormal prompt will be issued.

According to some embodiments of the present application, the steelmaking converter further includes that at least one of the at least one slave frequency converter is switchable with the master frequency converter, and the method further includes: if the speed feedback is abnormal, Then, the master-slave relationship between the master inverter and the slave inverter is switched.

According to some embodiments of the present application, after the speed reference is sent to the main inverter according to the work instruction, the method further includes: the main inverter filters the speed reference to obtain a filtered speed reference; Determining whether the speed feedback is abnormal according to the output current, excitation current setting, excitation current feedback, output torque, speed setting and speed feedback, further comprising: when the output current of the main inverter is at the first preset When the threshold is set, the first absolute value of the difference between the excitation current setting and the excitation current feedback is obtained, and the second absolute value of the difference between the filtered speed setting and the speed feedback is obtained, If the first absolute value is greater than the second preset threshold and the second absolute value is greater than the third preset threshold, it is determined that the speed feedback is abnormal.

According to some embodiments of the present application, the first preset threshold is that the output current is greater than 0 and less than the rated current of the motor, the second preset threshold is 20%, and the third preset threshold is 3 Hz.

According to some embodiments of the present application, determining whether the speed feedback is abnormal according to the output current, the excitation current setting, the excitation current feedback, the output torque, the speed setting and the speed feedback further includes: if the speed When the given value is 0, the output current is 0, the output torque is 0, and the speed feedback is not 0, it is determined that the speed feedback is abnormal.

According to some embodiments of the present application, the steelmaking converter further includes a programmable controller connected to the main frequency converter, and an intelligent display device connected to the programmable controller, the programmable controller receiving work instruction, and send a given speed to the main inverter according to the work instruction; if the speed feedback is abnormal, issuing an abnormal prompt includes: if the speed feedback is abnormal, controlling the intelligent display device to issue an abnormality hint.

According to an aspect of the embodiments of the present application, there is provided a speed detection device for a steelmaking converter, including: a speed setting module for receiving a work instruction, and sending a speed setting to the main inverter according to the work instruction , the output current of the main inverter, according to the output current of the main inverter, the vector calculation of the main inverter, the excitation current feedback is obtained, and the excitation current given is obtained through the main inverter to obtain the motor parameters and the internal fixed model of the main inverter; To obtain the speed feedback detected by the encoder connected to the main inverter; the judgment module is used to judge the output current, excitation current given, excitation current feedback, output torque, speed given and speed feedback Whether the speed feedback is abnormal; the prompt module is used to issue an abnormal prompt if the speed feedback is abnormal.

According to some embodiments of the present application, the steelmaking converter further includes that at least one of the at least one slave frequency converter and the master frequency converter are switchable for use, and the device further includes: a switching module for if the If the speed feedback is abnormal, switch the master-slave relationship between the master inverter and the slave inverter.

According to an aspect of the embodiments of the present application, a computer-readable medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, implements the speed detection method described in the foregoing embodiments.

According to an aspect of the embodiments of the present application, an electronic device is provided, including: one or more processors; a memory for storing executable instructions of the processors, when the executable instructions are executed by the one or more When executed by multiple processors, the one or more processors are made to implement the speed detection method described in the above embodiments.

Compared with the prior art, the significant beneficial effects of the above technical solution of the present application are: it is more advanced, accurate and timely to judge whether the feedback value of the encoder is correct; when an alarm is detected, an alarm prompt message is issued, but it does not stop The converter automatically controls the two inverters to switch between master and slave. After switching between master and slave, the encoder carried by the slave inverter will not cause the converter to run out of control even if there is a fault, so as to avoid the encoder failure to affect production and prevent molten steel from pouring from the furnace mouth. accident occurred.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not limiting of the present application.

Description of drawings

The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings.

FIG. 1 shows a flowchart according to an embodiment of the present application;

FIG. 2 shows a schematic diagram of a speed detection device of a steelmaking converter according to an embodiment of the present application;

FIG. 3 shows a schematic structural diagram of a computer system suitable for implementing the electronic device according to the embodiment of the present application.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be employed. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the present application.

The block diagrams shown in the figures are merely functional entities and do not necessarily necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices entity.

The flowcharts shown in the figures are only exemplary illustrations and do not necessarily include all contents and operations/steps, nor do they have to be performed in the order described. For example, some operations/steps can be decomposed, and some operations/steps can be combined or partially combined, so the actual execution order may be changed according to the actual situation.

According to some embodiments, the present application provides a speed detection method for a steelmaking converter, wherein the steelmaking converter includes a master inverter, at least one slave inverter connected to the master inverter, the master inverter and at least one slave inverter. The slave inverters are all connected with encoders, and the slave inverter receives the output torque of the master inverter. The method includes: Step 101 , receiving a work instruction, and sending a work instruction to the master inverter according to the work instruction The speed is given, the output current of the main inverter is obtained, and the excitation current feedback is obtained according to the output current of the main inverter and the vector calculation of the main inverter, and the excitation current is given by obtaining the motor parameters and the internal fixed model of the main inverter through the main inverter; Step 102 , obtain the speed feedback detected by the encoder connected to the main inverter; Step 103, determine the speed according to the output current, excitation current given, excitation current feedback, output torque, speed given and speed feedback Whether the feedback is abnormal; step 104, if the speed feedback is abnormal, an abnormal prompt is issued.

Based on the listed embodiment, the steelmaking converter further includes a programmable controller connected with the master inverter and the slave inverter, the programmable controller sends a speed reference to the master inverter according to the work instruction, and according to the output current of the master inverter, the master inverter Inverter vector calculation, get the feedback of the excitation current, the excitation current given is obtained through the main inverter to obtain the motor parameters and the internal fixed model of the main inverter, after the main inverter receives the programmable controller start and speed given commands, transmit The output torque is sent to the other three slave inverters, and each inverter excites its corresponding motor. The programmable controller obtains the speed feedback detected by the encoder connected to the main inverter, as well as the excitation current feedback. The programmable controller determines whether the speed feedback is abnormal according to the output current, excitation current reference, excitation current feedback, output torque, speed reference and speed feedback. Its determination methods include:

After the sending the speed reference to the main frequency converter according to the work instruction, the method further includes that the main frequency converter filters the speed reference to obtain the filtered speed reference. In some embodiments, it is not necessary to The speed reference is filtered, so in the following description, it can be the speed reference after filtering, or it can be the speed reference.

The following is described in terms of filtered speed reference:

When the output current of the main inverter is within the first preset threshold, obtain the first absolute value of the difference between the excitation current given and the excitation current feedback, and obtain the filtered speed given and The second absolute value of the difference of the speed feedback, if the first absolute value is greater than the second preset threshold, and the second absolute value is greater than the third preset threshold, it is determined that the speed feedback is abnormal. Among them, the first preset threshold is the current value of the normal operation of the motor, that is, the output current is greater than 0 and less than the rated current of the motor, and the second preset threshold is 20%. The second preset threshold can be slightly larger or smaller, according to actual tests. As long as it is below the rated current, the smaller the value is, the faster the alarm will be. The third preset threshold is 3Hz, and the third preset threshold is the speed setting threshold for closing the brake.

If the given speed is 0, the output current is 0, the output torque is 0, and the speed feedback is not 0, it is determined that the speed feedback is abnormal.

It also includes an intelligent display device connected to the programmable controller. If the speed feedback is abnormal, the programmable controller controls the intelligent display device to issue an abnormality prompt.

In some embodiments, the programmable controller adopts a PLC controller, and the intelligent display device adopts wincc upper-level monitoring. The present application can judge in advance, accurately and timely whether the feedback value of the encoder is correct.

According to some embodiments, the steelmaking converter further includes that at least one of the at least one slave frequency converter is switchable with the master frequency converter, and the method further includes: if the speed feedback is abnormal, switching all The master-slave relationship between the master inverter and the slave inverter.

Based on the listed example, including inverters 1 to 4, encoders 1 to 4, and motors 1 to 4. Among them, No. 1 to No. 4 speed encoders detect the speed feedback of No. 1 to No. 4 motors respectively, and transmit them to No. 1 to No. 4 inverters respectively. Motors 1 to 4 are the power drive equipment for the converter shaker. The No. 1 inverter is the main inverter, and the main inverter receives the speed reference, start and stop commands of the programmable controller, and controls the No. 1 motor to work. The No. 2 inverter, the No. 3 inverter and the No. 4 inverter are slave frequency conversion The inverter receives the torque control of the No. 1 main inverter and the corresponding No. 2 motor, No. 3 motor and No. 4 motor work. In the No. 1 to No. 4 inverters, No. 1 and No. 3 are master-slave inverters each other, that is, one of them If the master is the master, the other is the slave, and No. 2 and No. 4 are the slave inverters. When the speed feedback is abnormal, the programmable controller switches the master-slave relationship between the No. 1 master inverter and the No. 3 slave inverter. After switching, the The No. 3 inverter is the master inverter, and the No. 1 inverter is the slave inverter. Through the master-slave switching method, when an alarm is detected, an alarm prompt message will be issued, but the converter will not be stopped, and the two inverters will be automatically controlled to switch the master-slave. It will cause the converter to be out of control, so as to prevent the encoder failure from affecting the production and avoid the accident of molten steel pouring out of the furnace mouth.

In some embodiments, the No. 1 frequency converter is used as the main frequency converter, the No. 1 motor is used as the main motor, and the No. 1 encoder is used as the main encoder.

After the inverter receives the PLC start and speed given command, it first excites the motor. After the excitation is completed, the speed given by the PLC passes through the ramp function generator of the inverter, and the filtered speed given is recorded as f1. When there is a problem with the encoder speed feedback, the excitation current of the inverter vector control system will oscillate, and the output current will increase but there will be process changes. Therefore, according to the excitation current, the output current, the encoder speed feedback f2 and the filtered speed f1, the abnormality of the encoder can be quickly judged.

When the output current of the inverter is greater than 0 and less than 95% of the rated current of the motor (the daily maximum load rate is below 80%, to ensure that the motor does not exceed the rated current, this value can also be 98%), judge the excitation current given and the excitation current The absolute value of the feedback difference is divided by the excitation current given. When the result is greater than 20%, continue to judge. When the absolute value of the subtraction of the speed given f1 and the encoder speed feedback f2 is greater than 3Hz, the encoder will be reported at this time. Detect failure. The minimum running speed of the converter control system is 5Hz. When the speed reference is removed, the brake will be closed when decelerating to 3Hz. Therefore, the maximum absolute value of the absolute value after the subtraction of f1 and f2 is set to 3Hz. high or consistent speed.

The following describes the device embodiments of the present application, which can be used to implement the speed detection method of the steelmaking converter in the above-mentioned embodiments of the present application.

FIG. 2 shows a schematic diagram of a speed detection device 200 for a steelmaking converter in an embodiment of the present application. According to some embodiments, the speed detection device 200 for a steelmaking converter includes: the steelmaking converter includes a main frequency converter, a At least one slave inverter connected to the master inverter, the master inverter and at least one slave inverter are both connected with an encoder, the slave inverter receives the output torque of the master inverter, and the device includes: The speed setting module 201 is used for receiving a work instruction, and sending a speed setting to the main inverter according to the work instruction, the main inverter outputs a current, and according to the output current of the main inverter, the main inverter vector calculation to obtain the excitation Current feedback, obtains the motor parameters through the main inverter and the internal fixed model of the main inverter to obtain the excitation current given; the feedback acquisition module 202 is used to obtain the speed feedback detected by the encoder connected to the main inverter; the determination module 203 , used to determine whether the speed feedback is abnormal according to the output current, excitation current given, excitation current feedback, output torque, speed given and speed feedback; the prompt module 204 is used for if the speed feedback is abnormal, then An exception message is issued.

Based on the listed embodiment, the steelmaking converter further includes a programmable controller connected with the master inverter and the slave inverter, the programmable controller sends a speed reference to the master inverter according to the work instruction, and according to the output current of the master inverter, the master inverter Inverter vector calculation, get the feedback of the excitation current, the excitation current given is obtained through the main inverter to obtain the motor parameters and the internal fixed model of the main inverter, after the main inverter receives the programmable controller start and speed given commands, transmit The output torque is sent to the other three slave inverters, and each inverter excites its corresponding motor. The programmable controller obtains the speed feedback detected by the encoder connected to the main inverter, as well as the excitation current feedback. The programmable controller determines whether the speed feedback is abnormal according to the output current, excitation current reference, excitation current feedback, output torque, speed reference and speed feedback. Its determination methods include:

After the sending the speed reference to the main frequency converter according to the work instruction, the method further includes that the main frequency converter filters the speed reference to obtain the filtered speed reference. In some embodiments, it is not necessary to The speed reference is filtered, so in the following description, it can be the speed reference after filtering, or it can be the speed reference.

The following is described in terms of filtered speed reference:

When the output current of the main inverter is within the first preset threshold, obtain the first absolute value of the difference between the excitation current given and the excitation current feedback, and obtain the filtered speed given and The second absolute value of the difference of the speed feedback, if the first absolute value is greater than the second preset threshold, and the second absolute value is greater than the third preset threshold, it is determined that the speed feedback is abnormal. Among them, the first preset threshold is the current value of the normal operation of the motor, that is, the output current is greater than 0 and less than the rated current of the motor, and the second preset threshold is 20%. The second preset threshold can be slightly larger or smaller, according to actual tests. As long as it is below the rated current, the smaller the value is, the faster the alarm will be. The third preset threshold is 3Hz, and the third preset threshold is the speed setting threshold for closing the brake.

If the given speed is 0, the output current is 0, the output torque is 0, and the speed feedback is not 0, it is determined that the speed feedback is abnormal.

It also includes an intelligent display device connected to the programmable controller. If the speed feedback is abnormal, the programmable controller controls the intelligent display device to issue an abnormality prompt.

In some embodiments, the programmable controller adopts a PLC controller, and the intelligent display device adopts wincc upper-level monitoring. The present application can judge in advance, accurately and timely whether the feedback value of the encoder is correct.

According to some embodiments, the steelmaking converter further includes that at least one of the at least one slave frequency converter is switchable for use with the master frequency converter, and the device further includes: a switching module for if the speed feedback If abnormal, switch the master-slave relationship between the master inverter and the slave inverter.

Based on the above-mentioned embodiment, it includes inverters No. 1 to No. 4, encoders No. 1 to No. 4, and motors No. 1 to No. 4. Among them, No. 1 to No. 4 speed encoders detect the speed feedback of No. 1 to No. 4 motors respectively, and transmit them to No. 1 to No. 4 inverters respectively. Motors 1 to 4 are the power drive equipment for the converter shaker. The No. 1 inverter is the main inverter, and the main inverter receives the speed reference, start and stop commands of the programmable controller, and controls the No. 1 motor to work. The No. 2 inverter, the No. 3 inverter and the No. 4 inverter are slave frequency conversion The inverter receives the torque control of the No. 1 main inverter and the corresponding No. 2 motor, No. 3 motor and No. 4 motor work. In the No. 1 to No. 4 inverters, No. 1 and No. 3 are master-slave inverters each other, that is, one of them If the master is the master, the other is the slave, and No. 2 and No. 4 are the slave inverters. When the speed feedback is abnormal, the programmable controller switches the master-slave relationship between the No. 1 master inverter and the No. 3 slave inverter. After switching, the The No. 3 inverter is the master inverter, and the No. 1 inverter is the slave inverter. Through the master-slave switching method, when an alarm is detected, an alarm prompt message will be issued, but the converter will not be stopped, and the two inverters will be automatically controlled to switch the master-slave. It will cause the converter to be out of control, so as to prevent the encoder failure from affecting the production and avoid the accident of molten steel pouring out of the furnace mouth.

FIG. 3 shows a schematic structural diagram of a computer system suitable for implementing the electronic device according to the embodiment of the present application.

It should be noted that the computer system 300 of the electronic device shown in FIG. 3 is only an example, and should not impose any limitations on the functions and scope of use of the embodiments of the present application.

As shown in FIG. 3 , the computer system 300 includes a central processing unit (Central Processing Unit, CPU) 301, which can be loaded into a random device according to a program stored in a read-only memory (Read-Only Memory, ROM) 302 or from a storage part 308 Various appropriate actions and processes are performed by accessing the program in the memory (Random Access Memory, RAM) 303, for example, the speed detection method of the steelmaking converter described in the above-mentioned embodiment is performed. In the RAM 303, various programs and data necessary for system operation are also stored. The CPU 301 , the ROM 302 , and the RAM 303 are connected to each other through a bus 304 . An Input/Output (I/O) interface 305 is also connected to the bus 304 .

The following components are connected to the I/O interface 305: an input section 306 including a keyboard, a mouse, etc.; an output section 307 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc. ; a storage part 308 including a hard disk and the like; and a communication part 309 including a network interface card such as a LAN (Local Area Network) card, a modem, and the like. The communication section 309 performs communication processing via a network such as the Internet. A drive 310 is also connected to the I/O interface 305 as needed. A removable medium 311, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is mounted on the drive 310 as needed so that a computer program read therefrom is installed into the storage section 308 as needed.

In particular, according to embodiments of the present application, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the method illustrated in the flowchart. In such an embodiment, the computer program may be downloaded and installed from the network via the communication portion 309 and/or installed from the removable medium 311 . When the computer program is executed by the central processing unit (CPU) 301, various functions defined in the system of the present application are executed.

It should be noted that the computer-readable medium shown in the embodiments of the present application may be a computer-readable signal medium or a computer-readable storage medium, or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. More specific examples of computer readable storage media may include, but are not limited to, electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable Erasable Programmable Read Only Memory (EPROM), flash memory, optical fiber, portable Compact Disc Read-Only Memory (CD-ROM), optical storage device, magnetic storage device, or any suitable of the above The combination. In this application, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, however, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code therein. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device . Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination of the foregoing.

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. Wherein, each block in the flowchart or block diagram may represent a module, program segment, or part of code, and the above-mentioned module, program segment, or part of code contains one or more executables for realizing the specified logical function instruction. It should also be noted that, in some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It is also noted that each block of the block diagrams or flowchart illustrations, and combinations of blocks in the block diagrams or flowchart illustrations, can be implemented in special purpose hardware-based systems that perform the specified functions or operations, or can be implemented using A combination of dedicated hardware and computer instructions is implemented.

The modules involved in the embodiments of the present application may be implemented in software or hardware, and the described modules may also be provided in a processor. Among them, the names of these modules do not constitute a limitation on the module itself under certain circumstances.

As another aspect, the present application also provides a computer program product or computer program, where the computer program product or computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device executes the speed detection method for a steelmaking converter described in the above embodiments.

As another aspect, the present application also provides a computer-readable medium. The computer-readable medium may be included in the electronic device described in the above embodiments; it may also exist alone without being assembled into the electronic device. middle. The above computer readable medium carries one or more programs, when the one or more programs are executed by an electronic device, the electronic device implements the speed detection method for a steelmaking converter described in the above embodiments.

It should be noted that although several modules or units of the apparatus for action performance are mentioned in the above detailed description, this division is not mandatory. Indeed, according to embodiments of the present application, the features and functions of two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of one module or unit described above may be further divided into multiple modules or units to be embodied.

From the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein may be implemented by software, or may be implemented by software combined with necessary hardware. Therefore, the technical solutions according to the embodiments of the present application may be embodied in the form of software products, and the software products may be stored in a non-volatile storage medium (which may be CD-ROM, U disk, mobile hard disk, etc.) or on the network , which includes several instructions to enable a computing device (which may be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the speed detection method for a steelmaking converter described in the above embodiments.

Other embodiments of the present application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses or adaptations of this application that follow the general principles of this application and include common knowledge or conventional techniques in the technical field not disclosed in this application .

It is to be understood that the present application is not limited to the precise structures described above and illustrated in the accompanying drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A method for detecting a speed of a steel converter, wherein the steel converter includes a master converter and at least one slave converter connected to the master converter, an encoder is connected to each of the master converter and the at least one slave converter, and the slave converter receives an output torque of the master converter, the method comprising:

receiving a working instruction, sending a given speed and a current output by a main frequency converter to the main frequency converter according to the working instruction, obtaining exciting current feedback according to the current output by the main frequency converter and vector calculation of the main frequency converter, and obtaining a motor parameter and an internal fixed model of the main frequency converter through the main frequency converter to obtain a given exciting current;

acquiring speed feedback detected by an encoder connected with the main frequency converter;

judging whether the speed feedback is abnormal or not according to the output current, the exciting current given value, the exciting current feedback, the output torque, the speed given value and the speed feedback;

and if the speed feedback is abnormal, sending an abnormal prompt.

2. The method of claim 1, wherein the steelmaking converter further comprises at least one of the at least one slave frequency converter being switchable to use with the master frequency converter, the method further comprising:

and if the speed feedback is abnormal, switching the master-slave relationship between the master frequency converter and the slave frequency converter.

3. The method of claim 1, wherein after said sending a speed specification to said primary transducer according to said operating command, further comprising, said primary transducer filtering said speed specification to obtain a filtered speed specification;

the determining whether the speed feedback is abnormal according to the output current, the exciting current given value, the exciting current feedback, the output torque, the speed given value and the speed feedback further comprises:

and when the output current of the main frequency converter is within a first preset threshold value, acquiring a first absolute value of a difference value between the given exciting current and the feedback exciting current and acquiring a second absolute value of a difference value between the given filtered speed and the feedback speed, and if the first absolute value is greater than a second preset threshold value and the second absolute value is greater than a third preset threshold value, judging that the feedback speed is abnormal.

4. The method according to claim 3, wherein the first preset threshold is an output current greater than 0 and less than a rated current of the motor, the second preset threshold is 20%, and the third preset threshold is a speed setting threshold for closing the band-type brake.

5. The method of claim 1, wherein said determining whether said speed feedback is abnormal based on said output current, field current set, field current feedback, output torque, speed set, and speed feedback, further comprises:

if the speed is given as 0, the output current is 0, and the output torque is 0, the speed feedback is not 0, it is determined that the speed feedback is abnormal.

6. The method of claim 1, wherein the steelmaking converter further comprises a programmable controller connected to the main converter and an intelligent display device connected to the programmable controller, wherein the programmable controller receives operating instructions and sends speed commands to the main converter according to the operating instructions;

if the speed feedback is abnormal, the sending out an abnormal prompt comprises the following steps:

and if the speed feedback is abnormal, controlling the intelligent display equipment to send an abnormal prompt.

7. A speed detection device of a steel converter is characterized in that the steel converter comprises a main frequency converter and at least one slave frequency converter connected with the main frequency converter, the main frequency converter and the at least one slave frequency converter are both connected with encoders, the slave frequency converter receives the output torque of the main frequency converter, and the device comprises:

the speed setting module is used for receiving a working instruction, sending a speed setting to the main frequency converter according to the working instruction, outputting current by the main frequency converter, performing vector calculation by the main frequency converter according to the output current of the main frequency converter to obtain excitation current feedback, and obtaining motor parameters and an internal fixed model of the main frequency converter through the main frequency converter to obtain the excitation current setting;

the feedback acquisition module is used for acquiring the speed feedback detected by the encoder connected with the main frequency converter;

the judging module is used for judging whether the speed feedback is abnormal or not according to the output current, the given exciting current, the feedback exciting current, the output torque, the given speed and the feedback speed;

and the prompting module is used for sending out an abnormal prompt if the speed feedback is abnormal.

8. The apparatus of claim 7, wherein the steelmaking converter further comprises at least one of the at least one slave frequency converter being switchable to use with the master frequency converter, the apparatus further comprising:

and the switching module is used for switching the master-slave relation between the master frequency converter and the slave frequency converter if the speed feedback is abnormal.

9. An electronic device, comprising one or more processors and one or more memories having at least one program code stored therein, the at least one program code being loaded into and executed by the one or more processors to perform operations performed by the method of detecting speed of a steelmaking converter according to any one of claims 1 to 6.

10. A computer-readable storage medium having at least one program code stored therein, the at least one program code being loaded into and executed by a processor to perform operations performed by the method of detecting a speed of a steelmaking converter as claimed in any one of claims 1 to 6.

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