Synchronous control method for converter tilting transmission system by using S120 frequency converter

Abstract

The invention discloses a converter tilting transmission system applied S120 frequency converter synchronous control method, which comprises a control system and an S120 frequency converter, and comprises the following steps: acquiring parameters of a system model selection CU control unit, a power unit and a motor speed detection module, the CU control unit and the motor speed detection module are respectively connected with the S120 frequency converter power unit; acquiring a connection communication interface between the CU control unit and the S120 frequency converter power unit and between the motor speed detection module and the S120 frequency converter power unit, and configuring a network topology structure in the debugging system; the S120 frequency converter comprises a master frequency converter and a slave frequency converter, the master frequency converter and the slave frequency converter respectively select control modes, and the slave frequency converter sets control parameters along with the master frequency converter. By applying the multi-axis control function of the S120 frequency converter control unit, multi-split control is achieved, and therefore the problem that multiple drives are not synchronous is thoroughly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical drive automation control, and particularly to a synchronous control method for a converter tilting drive system applying an S120 frequency converter. Background Art

[0002] The converter tilting system is the most critical link in the steelmaking process. The stability and high precision of the converter tilting system are directly related to whether the output index and various economic and technical indexes can be achieved. Therefore, when designing the converter tilting system, the imported brand Siemens' PLC controller and Siemens' 6SE70 series drive system were mainly considered for the automation control and drive system. During the project construction stage, it was already the best choice at that time to use 1 set of Siemens PLC controller and 4 sets of Siemens 6SE70 drive systems for the converter tilting system, which could better meet the requirements of the production working conditions and also laid a foundation for the output of the steelmaking system and the achievement of various economic and technical indexes. However, the Siemens 6SE70 frequency converter has its limitations. It does not have the multi-axis control function. Even by networking, the synchronization of 4 tilting drives is achieved through ring network communication. However, since the 4 frequency converters have their own control centers, the synchronization is poor.

[0003] There are mainly the following defects:

[0004] 1. The tilting drive system is controlled by Siemens 6SE70 frequency converters. The 4 frequency converters have their own control centers. There are time differences in synchronous control. Due to the response speed time differences of the mechanical drive reducers, the problems of out-of-synchronization and high frequency converter failure rates have always existed, and the reducers are severely worn.

[0005] 2. The communication connection between the 4 frequency converters for tilting drive control is a profibus-dp connection. The control connection is relatively complex. Once a front-end failure occurs, the entire system equipment cannot operate, and the maintenance difficulty is large.

[0006] 3. The communication between the frequency converters is profibus-dp communication, and the communication rate is low. Summary of the Invention

[0007] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a synchronous control method for a converter tilting drive system applying an S120 frequency converter. By applying the multi-axis control function of the control unit CU320-2DP of the new generation Siemens S120 frequency converter, the one-to-many control is realized, thus completely solving the problem of out-of-synchronization of multiple drives, improving the stability of the system, and reducing the wear of the mechanical reducer caused by out-of-synchronization of the mechanical drive.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a synchronous control method for the converter tilting drive system applying the S120 frequency converter, including a control system and the S120 frequency converter, and comprising the following steps:

[0009] Obtain the parameters of the system selection CU control unit, power unit and motor speed detection module. The power unit includes multiple S120 frequency converter power units, and the CU control unit and the motor speed detection module are respectively connected to the S120 frequency converter power units;

[0010] Obtain the connection communication interfaces of the CU control unit and the motor speed detection module with the S120 frequency converter power units, and configure the network topology structure in the debugging system;

[0011] The S120 frequency converter includes a main frequency converter and a slave frequency converter. The main frequency converter and the slave frequency converter respectively select control modes, and the slave frequency converter follows the control parameters set by the main frequency converter.

[0012] As a further improvement of the present invention: the obtained system selection power unit includes: selecting the power unit according to the control signal of the control system. The power unit includes multiple Motor_Module modules, and the Motor_Module module has a third DRIVE-CLIQ communication interface.

[0013] As a further improvement of the present invention: the obtained system selection CU control unit includes: selecting the CU control unit according to the control signal of the control system and configuring the CU320-2DP module. The CU320-2DP module has a first DRIVE-CLIQ communication interface, and the CU320-2DP module is connected to multiple Motor_Module modules.

[0014] As a further improvement of the present invention: the obtained system selection motor speed detection module includes: selecting the motor speed detection module according to the control signal of the control system. The motor speed detection module includes an SMC30 speed encoder module. The SMC30 speed encoder module has a second DRIVE-CLIQ communication interface, and the SMC30 speed encoder module is connected to the corresponding Motor_Module module.

[0015] As a further improvement of the present invention: the connection of the CU control unit and the motor speed detection module to the S120 frequency converter power units respectively includes:

[0016] The CU320-2DP module communicates through the first DRIVE-CLIQ communication interface and the third DRIVE-CLIQ communication interface to establish connections with multiple S120 frequency converter power units;

[0017] The SMC30 speed encoder module configured for any S120 frequency converter communicates through the first DRIVE-CLIQ communication interface and the third DRIVE-CLIQ communication interface to establish a connection with the Motor_Module module of the S120 frequency converter itself.

[0018] As a further improvement of the present invention: The configuration of the network topology structure in the debugging system includes:

[0019] Obtain the connection methods of the CU320-2DP module with multiple S120 frequency converter power units and the SMC30 speed encoder module with the corresponding Motor_Module modules, and establish a network topology structure consistent with the topological connection structure of the connection methods of the CU320-2DP module with multiple S120 frequency converter power units and the SMC30 speed encoder module with the corresponding Motor_Module modules in the debugging system.

[0020] As a further improvement of the present invention: The establishment of a network topology structure consistent with the connection method of the topological connection structure in the debugging system includes:

[0021] After the initial configuration of the network topology structure is completed, when replacing the DRIVE-CLIQ network cable during daily maintenance, the corresponding devices are reconnected according to the connection method of the network topology structure, and the network topology structure is automatically generated after the connection configuration.

[0022] As a further improvement of the present invention: The selection of control modes for the main frequency converter and the slave frequency converter respectively includes:

[0023] The main frequency converter adopts a vector control mode with speed closed-loop, and the slave frequency converter adopts a vector control mode with torque closed-loop. The slave frequency converter receives the torque given set value sent by the main frequency converter and performs closed-loop control according to the torque given set value.

[0024] As a further improvement of the present invention: The selection of control modes for the main frequency converter and the slave frequency converter respectively further includes:

[0025] The master-slave selection control of the S120 frequency converter is through the communication interface given by the control system to the CU320-2DP module. The S120 frequency converters are interconnected through CO / BO, and the speed setting parameters of the corresponding Motor_Module modules are adjusted to achieve master-slave switching.

[0026] As a further improvement of the present invention: it further includes brake control, which performs brake debugging on the frequency converter and determines the brake control parameters of the frequency converter according to the debugging results. Specifically, the brake control is frequency converter control. When the starting current reaches the 20% threshold of the rated current, the brake is released and opened. The condition for closing the brake is that there is no enabling and the rotational speed is less than the 50 r / min threshold.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The present invention is a method for improving the synchronization of the main and slave controls of the converter tilting. By applying the multi-axis control function of the S120 frequency converter control unit CU320-2DP, the control of one driving multiple is realized, thus completely solving the problem of non-synchronization of multiple drives, improving the stability of the system, and reducing the wear of the mechanical reducer caused by non-synchronization of the mechanical transmission; solving the problem of the difference in multi-drive synchronization of the converter tilting system, and this control method is more economical and affordable compared to the single-to-single control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0030] Figure 2 It is a schematic diagram of the electrical schematic structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to clearly and completely understand the technical solution, the present invention will be further described below in conjunction with the embodiments and the drawings. Obviously, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0032] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0033] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0034] It should also be further understood that the term "and / or" used in the specification and appended claims of the present invention refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] An embodiment of the present invention provides a synchronous control method for the converter tilting drive system applying the S120 frequency converter. Based on the multi-axis function of the new generation Siemens S120 frequency converter, 4 S120s are selected and the Siemens control system is applied in this embodiment, including the following steps:

[0036] S100. Obtain the parameters of the system selection CU control unit, power unit, and motor speed detection module. The power unit includes multiple S120 frequency converter power units, and the CU control unit and the motor speed detection module are respectively connected to the S120 frequency converter power unit;

[0037] S101. The system selection CU control unit obtained includes: selecting the CU control unit according to the control signal of the control system to configure the CU320-2DP module. The CU320-2DP module has a first DRIVE-CLIQ communication interface, and the CU320-2DP module is connected to multiple Motor_Module modules. In this embodiment, the CU configuration is selected according to the system requirements. By selecting the Siemens CU320-2DP module as the control unit, the model is: 6SL3040-1MA00-0AA0. This model CU320-2DP module control unit has 4 DRIVE-CLIQ communication interfaces, namely X100, X101, X102, and X103, which can realize connecting one CU to 4 Siemens power units.

[0038] S102. The system selection motor speed detection module obtained includes: selecting the motor speed detection module according to the control signal of the control system. The motor speed detection module includes the SMC30 speed encoder module. The SMC30 speed encoder module has a second DRIVE-CLIQ communication interface, and the SMC30 speed encoder module is connected to the corresponding Motor_Module module. In this embodiment, the power unit is selected according to the system requirements. By selecting the Siemens Motor_Module module, the model is 6SL3310-1TE-1AA3. This model power unit has 3 DRIVE-CLIQ communication interfaces, namely X401, X402, and X403, to realize the DRIVE-CLIQ communication connection with the CU and SMC30 modules.

[0039] S103. The power unit for obtaining the system selection type includes: selecting a power unit according to the control signal of the control system. The power unit includes multiple Motor_Module modules, and the Motor_Module module has a third DRIVE-CLIQ communication interface. In this embodiment, a motor speed detection module is selected according to system requirements. By selecting the Siemens SMC30 speed encoder module, model number 6SL3055--0AA00-5CA2, this model of speed encoder module has 1 DRIVE-CLIQ communication port, and is connected to the power unit of the S120 frequency converter.

[0040] S104. The establishment of connections between the CU control unit and the motor speed detection module and the power unit of the S120 frequency converter respectively includes:

[0041] The CU320-2DP module communicates with multiple power units of the S120 frequency converter through the first DRIVE-CLIQ communication interface and the third DRIVE-CLIQ communication interface to establish a connection;

[0042] The SMC30 speed encoder module configured for any S120 frequency converter communicates with the Motor_Module module of the S120 frequency converter itself through the first DRIVE-CLIQ communication interface and the third DRIVE-CLIQ communication interface to establish a connection.

[0043] In this embodiment, by using the 4 DRIVE-CLIQ communication interfaces of the CU320-2DP module control unit body, namely X100, X101, X102, X103, and the 3 communication interfaces of the power unit body of the Motor_Module module, namely X401, X402, X403, and the 1 communication interface of the SMC30 speed encoder module body. In terms of hardware wiring, the X100 interface of the CU320-2DP module control unit is connected to the X401 interface of the Motor_Module module of the No. 1 S120 frequency converter. Similarly, the X101 interface of the CU320-2DP module control unit is connected to the X401 interface of the Motor_Module module of the No. 2 S120 frequency converter,, the X102 interface of the CU320-2DP module control unit is connected to the X401 interface of the Motor_Module module of the No. 3 S120 frequency converter,, the X103 interface of the CU320-2DP module control unit is connected to the X401 interface of the Motor_Module module of the No. 4 frequency converter, and the SMC30 speed encoder module configured for each S120 frequency converter is connected to the X402 interface of the Motor_Module module of its own S120 frequency converter. The above completes the connection of all hardware communication lines.

[0044] S200. Obtain the connection communication interfaces between the CU control unit, the motor speed detection module and the power unit of the S120 frequency converter, and configure the network topology structure within the debugging system;

[0045] S201. Obtain the connection methods between the CU320-2DP module and multiple S120 frequency converter power units, and between the SMC30 speed encoder module and the corresponding Motor_Module module. According to the topological connection structure of the connection methods between the CU320-2DP module and multiple S120 frequency converter power units, and between the SMC30 speed encoder module and the corresponding Motor_Module module, establish a network topology structure in the debugging system that is consistent with the connection method of the topological connection structure.

[0046] S202. After the initial configuration of the network topology structure is completed, when replacing the DRIVE-CLIQ network cable during daily maintenance, the corresponding devices are reconnected according to the connection method of the network topology structure, and the network topology structure is automatically generated after the connection configuration.

[0047] Configure the network topology structure inside the STARTER debugging software. The configuration of the network topology structure should be consistent with the actual interface installation position of the hardware communication line. Otherwise, corresponding topology faults will be reported and real-time data communication between devices cannot be achieved. It should be noted that after the first configuration of the network topology structure is completed, during subsequent daily maintenance when replacing the DRIVE-CLiQ network cable, it must be configured according to the connection configuration of the network topology structure. Otherwise, the actual network will not correspond to the network topology structure, resulting in communication failures. The network topology structure will be automatically generated after reconfiguration.

[0048] S300. The S120 frequency converter includes a main frequency converter and a slave frequency converter. The main frequency converter and the slave frequency converter respectively select control modes, and the slave frequency converter follows the control parameters set by the main frequency converter.

[0049] S301. The main frequency converter adopts a vector control mode with speed closed-loop, and the slave frequency converter adopts a vector control mode with torque closed-loop. The slave frequency converter receives the torque given set value sent by the main frequency converter and conducts closed-loop control according to the torque given set value.

[0050] S302. The master-slave selection control of the S120 frequency converter is through the communication interface given by the control system to the CU320-2DP module. The S120 frequency converters are interconnected through CO / BO, and the speed setting parameters of the corresponding Motor_Module module are adjusted to achieve master-slave switching.

[0051] In this embodiment, the converter tilting system should not only meet the requirements of high control accuracy but also meet the control requirements of one master and three slaves. Therefore, higher requirements are put forward in the design and selection of the control mode. The main frequency converter must adopt the vector control mode with speed closed-loop to ensure the stable speed of the main frequency converter. The slave frequency converters cannot adopt the vector control mode with speed closed-loop. Otherwise, the speeds of the multi-drive devices will be asynchronous, resulting in uneven forces on the equipment at the joints such as the connecting shafts on site, and equipment failures such as tearing and breaking, which will have a greater impact on production. Therefore, the slave frequency converters can only adopt the vector control mode with torque closed-loop. The slave frequency converters receive the torque given set value sent by the main frequency converter and carry out closed-loop control according to the torque given set value, that is, the follow-up control mode, so as to avoid equipment damage caused by inconsistent speeds of the multi-drive devices. In addition, higher requirements are also put forward for the parameter settings of the frequency converters and the optimization of the PI regulators. According to the results of multiple debuggings, reasonable parameter settings and proper settings of the PI regulators can ensure more stable operation of the frequency converters and more efficient process control of the converter tilting system. In addition, in terms of parameter settings, the master-slave selection control of the S120 frequency converter is given to the control unit of the X122 terminal of the CU320-2DP module through the control system (PLC controller), and through CO / BO interconnection, the P742-P745 values of the parameters correspond to P1051 of the Motor_Module module of the 1st to 4th S120 frequency converters to achieve master-slave switching. The slave frequency converters receive the control word and torque setting from the main frequency converter to achieve synchronous operation, and the torque setting comes from the DCC given program.

[0052] S400, brake control, which conducts brake debugging on the frequency converter and determines the brake control parameters of the frequency converter according to the debugging results. Specifically, the brake control is frequency converter control. When the starting current reaches the 20% threshold of the rated current, the brake is released and opened. The condition for closing the brake is that there is no enable and the speed is less than the 50 r / min threshold.

[0053] The converter tilting system also has relatively high control requirements for the motor brake. Once the brake control is unstable, it will cause overcurrent tripping when the frequency converter starts or the vehicle slides during startup. In severe cases, safety accidents may also occur. Therefore, the control principle and control parameters of the brake should be carefully checked and can only be put into normal use after normal debugging. In this embodiment, according to the results of on-site actual debugging, the control logic and threshold of the motor brake are finally determined as follows: the motor brake control is S120 frequency converter control. The condition for the brake to act is that the S120 frequency converter is enabled and there is no emergency stop. When the starting current reaches the 20% threshold of the rated current, the brake is released and opened. The condition for closing the brake is that there is no enable and the speed is less than the 50 r / min threshold.

[0054] 1. The present invention patent is a master-slave synchronization control method for a converter tilting drive system using a single CU of the S120 frequency converter. According to the multi-axis control function of the new generation of Siemens drive control unit CU320-2DP, this method realizes the synchronization control of one driving multiple, with high control accuracy and good system synchronization.

[0055] 2. Based on the principle of electric drive automation control, the present invention has a simpler and more practical structure compared with the old generation of drive systems.

[0056] 3. When the old generation of products is out of production and equipment iteration and upgrading are carried out, the present invention optimizes and improves the defects existing in the original drive control. It not only completes the equipment upgrade, makes up for the defects in equipment functions, but also improves the performance of the equipment.

[0057] In summary, after reading the present invention document, various other corresponding transformation schemes made by ordinary technicians in the art without creative mental labor according to the technical solutions and technical concepts of the present invention all fall within the scope protected by the present invention.

Claims

1. A synchronous control method for the converter tilting drive system applying the S120 frequency converter, comprising a control system and the S120 frequency converter, characterized in that, Including the following steps: Obtain the parameters of the system selection CU control unit, power unit, and motor speed detection module. The power unit includes multiple S120 frequency converter power units. The CU control unit and the motor speed detection module are respectively connected to the S120 frequency converter power units; Obtain the connection communication interfaces between the CU control unit, the motor speed detection module and the S120 frequency converter power units, and configure the network topology structure within the debugging system; The S120 frequency converter includes a main frequency converter and a slave frequency converter. The main frequency converter and the slave frequency converter respectively select control modes, and the slave frequency converter follows the control parameters set by the main frequency converter.

2. The synchronous control method of applying the S120 frequency converter to the converter tilting drive system according to claim 1, characterized in that The obtaining of the system selection power unit includes: selecting the power unit according to the control signal of the control system. The power unit includes multiple Motor_Module modules, and the Motor_Module module has a third DRIVE-CLIQ communication interface.

3. A synchronous control method for the converter tilting drive system applying the S120 frequency converter according to claim 2, characterized in that, The obtaining of the system selection CU control unit includes: selecting the CU control unit according to the control signal of the control system and configuring the CU320-2DP module. The CU320-2DP module has a first DRIVE-CLIQ communication interface, and the CU320-2DP module is connected to multiple Motor_Module modules.

4. A synchronous control method for the converter tilting drive system applying the S120 frequency converter according to claim 3, characterized in that, The obtaining of the system selection motor speed detection module includes: selecting the motor speed detection module according to the control signal of the control system. The motor speed detection module includes an SMC30 speed encoder module. The SMC30 speed encoder module has a second DRIVE-CLIQ communication interface, and the SMC30 speed encoder module is connected to the corresponding Motor_Module module.

5. The synchronous control method of the converter tilting drive system applying the S120 frequency converter according to claim 4, characterized in that, The connection between the CU control unit and the motor speed detection module and the S120 frequency converter power units respectively includes: The CU320-2DP module communicates through the first DRIVE-CLIQ communication interface and the third DRIVE-CLIQ communication interface to establish connections with multiple S120 frequency converter power units; The SMC30 speed encoder module configured in any S120 frequency converter communicates through the first DRIVE-CLIQ communication interface and the third DRIVE-CLIQ communication interface to establish a connection with the Motor_Module module of the S120 frequency converter itself.

6. A synchronous control method for the converter tilting drive system applying the S120 frequency converter according to claim 5, characterized in that, The configuration of the network topology structure within the debugging system includes: Obtain the connection methods between the CU320-2DP module and multiple S120 frequency converter power units and between the SMC30 speed encoder module and the corresponding Motor_Module modules, and based on the topological connection structure of the connection methods between the CU320-2DP module and multiple S120 frequency converter power units and between the SMC30 speed encoder module and the corresponding Motor_Module modules, establish a network topology structure within the debugging system that is consistent with the connection method of the topological connection structure.

7. A synchronous control method for the converter tilting drive system applying the S120 frequency converter according to claim 6, characterized in that, The establishment of a network topology structure within the debugging system that is consistent with the connection method of the topological connection structure includes: After the initial configuration of the network topology is completed, when replacing the DRIVE-CLIQ network cable during daily maintenance, the corresponding devices are reconnected according to the connection method of the network topology, and the network topology is automatically generated after the connection configuration.

8. A synchronous control method for the converter tilting drive system applying the S120 frequency converter according to claim 7, characterized in that, The control modes selected by the main frequency converter and the slave frequency converter respectively include: The main frequency converter adopts a vector control mode with a speed closed-loop, and the slave frequency converter adopts a vector control mode with a torque closed-loop. The slave frequency converter receives the torque given set value sent by the main frequency converter and performs closed-loop control according to the torque given set value.

9. A synchronous control method for the converter tilting drive system applying the S120 frequency converter according to claim 8, characterized in that The control modes selected by the main frequency converter and the slave frequency converter respectively also include: The master-slave selection control of the S120 frequency converter is given to the communication interface of the CU320-2DP module through the control system. The S120 frequency converters are interconnected through CO / BO, and the speed setting parameters of the corresponding Motor_Module module are adjusted to achieve master-slave switching.

10. A synchronous control method for the converter tilting drive system applying the S120 frequency converter according to claim 1, characterized in that, It also includes brake control. The brake control performs brake debugging on the frequency converter and determines the brake control parameters of the frequency converter according to the debugging results. Specifically, the brake control is frequency converter control. When the starting current reaches the 20% threshold of the rated current, the brake is released and opened. The condition for the brake to close is that there is no enable and the speed is less than the 50 r / min threshold.

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