High-voltage frequency converter redundancy control driving system based on multi-machine parallel connection structure

Abstract

The utility model relates to a high-voltage frequency converter redundancy control driving system based on a multi-machine parallel connection structure, which comprises a plurality of high-voltage frequency converters respectively connected with a main control cabinet circuit, and the plurality of high-voltage frequency converters are connected with a motor circuit in a parallel connection mode and jointly output current to drive a motor to operate. The main control cabinet is provided with two sets of independent main control systems and is respectively provided with an independent main control board, and each high-voltage frequency converter is provided with two sets of independent sub-control systems and is respectively provided with an independent sub-control board. The sub-control boards of the two sets of sub-control systems are respectively in one-to-one correspondence and communication connection with the main control boards of the two sets of main control systems through optical fibers to form a control circuit of the parallel driving system of the two paths of high-voltage frequency converters, redundant backups of the two paths of high-voltage frequency converters can be mutually realized, and the main control boards of the two sets of main control systems are also in communication connection through optical fibers. According to the utility model, redundancy control design is adopted, the frequency converter parallel drive system is not affected by faults, and stable operation of the motor is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of high-voltage frequency converter multi-machine parallel drive system for driving motor, in particular to a kind of high-voltage frequency converter redundancy control drive system based on multi-machine parallel structure. BACKGROUND

[0002] With the development of industrial technology, the application occasions of motor speed regulation or torque and position control using frequency converters are more and more widely. The motor power in some application scenarios is very large, and as a kind of power electronic device, it is difficult to achieve high power due to factors such as power devices, heat dissipation technology, manufacturing process and production cost. Therefore, people consider using parallel connection of frequency converters to increase the overall output power of the frequency converter system.

[0003] Due to the parallel output of the frequency converter, the output waveforms of multiple frequency converters need to be coordinated and synchronized to ensure balanced output current and suppress circulating current, which will lead to a complex control system. In traditional frequency converter drive systems, there are master-slave control, hierarchical control, central control and other parallel control methods for frequency converters. Currently, there are patents such as CN 104167907A and CN 113676069A that propose frequency converter parallel topology and its control method to achieve high-power parallel output and improve circulating current. However, regardless of which control method is used, it will increase the size of the drive system, increase the number of nodes in the drive system, and any single node failure in the drive system will make the entire parallel frequency converter drive system unusable, thereby greatly reducing the reliability of the parallel frequency converter drive system. Even if the main control system in the frequency converter drive system is designed with redundancy control, it still cannot guarantee the operational reliability of each system node in the high-voltage frequency converter multi-machine parallel structure.

[0004] CN117013921A proposes a frequency converter redundancy control system for parallel driving of frequency converters. It configures two frequency converters as master-slave, and each frequency converter includes its own main and backup controllers. This method can achieve redundancy of the control system of each of the two frequency converters and redundancy backup of the two frequency converters. It uses two sets of frequency converters to improve the reliability of the system, but its parallel operation condition is that the frequency converter power unit fails and the output of a single frequency converter is limited. It is not a normal operating condition, and its two frequency converters each output 50% of the rated power. The essence is that the two frequency converters are backup for each other, and they cannot achieve multi-machine parallel to increase the output power to drive the motor together. Moreover, since this method is based on master-slave backup, it needs time for fault switching and cannot achieve disturbance-free switching. At the same time, this method can only be applied to the case of 2 frequency converters as master-slave backup, and cannot be applied to the case of 3 or more frequency converters in parallel output.

[0005] CN 211127643U proposes a high-voltage frequency converter double control machine redundancy topology structure, which improves the reliability of single high-voltage frequency converter control system through control system redundancy, but since multiple frequency converters are connected in parallel, the control systems of each frequency converter need to be in synchronous working mode and need to communicate with each other for coordination. If multiple frequency converters have double control and redundancy topology structure, the synchronous communication interaction link of each control machine will increase in factorial form, and it will be a very difficult challenge to make the parallel system after parallel still have redundancy function. Therefore, the method cannot be applied to the occasion of multiple frequency converters in parallel through simple modification. Content of the utility model

[0006] The utility model aims at solving the defects of prior art, and designs a high-voltage frequency converter redundancy control driving system based on multiple machine parallel structure, multiple high-voltage frequency converters adopt parallel structure, and the main control system and the sub control system in traditional scheme are combined with redundancy control design, so that the control system redundancy of multiple machine parallel frequency converter system is realized while improving the output power of frequency converter. The redundancy control driving system of the utility model carries out high-voltage frequency converter multiple machine parallel connection, can effectively improve the reliability of entire motor driving system, when single node fault in driving system, the spare redundancy control system component can replace the control component of fault and put into operation, and since the control system of entire system has no distinction between master and slave, so switching process theoretically does not need time, and can realize undisturbed switching. The entire frequency converter parallel driving system can keep normal operation and is not affected by fault, effectively guarantees the stable operation of motor.

[0007] The utility model discloses a high -voltage frequency changer redundancy control drive system based on parallelly connected structure of many machines, including many high -voltage frequency changers with main control cabinet circuit connection respectively, the many high -voltage frequency changer with motor circuit connection in parallel mode, constitute high -voltage frequency changer parallel drive system, and the total rated output current value of many high -voltage frequency changer after parallel connection is greater than the rated output current value of single high -voltage frequency changer, the motor is driven by the common output current of many high -voltage frequency changer, and the main control cabinet is equipped with two independent main control systems, and each main control system is equipped with independent main control board, and each high -voltage frequency changer is equipped with two independent sub -control systems, and each sub -control system is equipped with independent sub -control board, and the sub -control board of two sub -control systems of high -voltage frequency changer is connected with the main control board of two main control systems one -one through fiber communication connection, constitutes the control circuit of two -way high -voltage frequency changer parallel drive system, and the main control board of two main control systems is also connected through fiber communication, and the main control system is also equipped with output voltage sampling module, communication module and auxiliary power module, and is connected with the main control board circuit of respective corresponding, and the sub -control system is also equipped with current voltage sampling module, drive signal output module, communication module and auxiliary power module, and is connected with the sub -control board circuit of respective corresponding.

[0008] One way of the control circuit of two -way high -voltage frequency changer parallel drive system is in -use control circuit, and one way is redundancy control circuit, when in -use control circuit fails, redundancy control circuit switches to working state, after removing the fault, the running redundancy control circuit resets to redundancy backup working state, and in -use control circuit switches to working state, all internal components and control procedures of in -use control circuit and redundancy control circuit are same, realize undisturbed switching.

[0009] The main control system and the sub -control system are also respectively equipped with human -computer interaction interface HMI and programmable logic controller PLC, and the main control board in the main control system is also provided with a voltage sampling circuit for sampling the three-phase voltage input to the motor, and the sub -control board in the sub -control system is also provided with a current sampling circuit for sampling the output current of the connected frequency converter, and the programmable logic controller PLC of each sub -control system is connected with the programmable logic controller PLC of the main control system through field bus communication, and the programmable logic controller PLC of the main control system is connected with the upper computer system UCS of the external upper layer.

[0010] The three-phase output end of the multiple high -voltage frequency changers is connected to the three -phase input end of the motor through a smoothing reactor in parallel.

[0011] The utility model discloses the beneficial effect is: the utility model discloses the redundancy control design, any one set of main control system contains the complete frequency converter parallel drive system's all functions, can independently to frequency converter parallel drive system carry out operation control, when the single node of drive system occurs the fault, can switch to the standby control system operation, avoid drive system and lead to the shutdown of motor because of the fault, and this utility model still designs the fault reset function, when the trouble spot is repaired and is excluded, and the standby control system can reenter the redundancy backup state, the utility model discloses a set of standby control system is realized the redundancy backup of control system to the combination of the parallel structure of multiple high voltage frequency converters, effectively improves the power output and operation reliability of high voltage frequency converter multistage parallel drive system, guarantees motor can continuously and stably operate. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the composition structure schematic diagram of high voltage frequency converter redundancy control drive system based on multiple machine parallel structure.

[0013] In the drawing: 1, main control cabinet;2, field bus;3, optical fiber;4, current sampling circuit;5, voltage sampling circuit;6, smoothing reactor. DETAILED DESCRIPTION

[0014] The utility model will be further explained in connection with the drawings and specific embodiment.

[0015] According to the Figure 1The utility model discloses a kind of high voltage frequency converter redundancy control driving systems based on multi-machine parallel structure, its component structure includes multiple high voltage frequency converters respectively with main control cabinet 1 circuit connection, the main control cabinet 1 is equipped with two independent main control systems, respectively main control system one and main control system two, each main control system is equipped with independent main control board (two main control systems The main control board correspondingly set is main control board one and main control board two) and with main control board circuit connection output voltage sampling module, communication module and auxiliary power module, each the high voltage frequency converter is equipped with two independent sub control systems, respectively sub control system one and sub control system two, each sub control system is equipped with independent sub control board (two sub control systems The sub control board correspondingly set is sub control board one and sub control board two) and with sub control board circuit connection current voltage sampling module, drive signal output module, communication module and auxiliary power module.The sub control board one of the high voltage frequency converter is connected with the main control board one in main control cabinet 1 respectively through respective optical fiber 3 and establishes communication, the sub control board two of the high voltage frequency converter is connected with the main control board two in main control cabinet 1 respectively through respective optical fiber 3 and establishes communication, main control board one and main control board two are connected through optical fiber and establish communication, multiple high voltage frequency converters are connected with motor circuit in parallel, and the total rated output current value of multiple high voltage frequency converters after parallel connection is greater than the rated output current value of single high voltage frequency converter, and the motor is driven by the common output current of multiple high voltage frequency converters.

[0016] In the embodiment, in normal operation, the high voltage frequency converter redundancy control driving system based on multi-machine parallel structure controls the frequency converter with the control circuit corresponding to main control board one and sub control board one as in-use control circuit, and the control circuit corresponding to main control board two and sub control board two as redundant control circuit in a redundant backup state. When main control system one detects that any component in the control circuit corresponding to main control board one and sub control board one fails in operation, it can immediately switch to operation through the control circuit corresponding to main control board two and sub control board two without disturbance, and the whole frequency converter parallel driving system continuously drives the motor to operate without shutdown. After the failed component in the control circuit of main control board one and sub control board one is repaired, the frequency converter system can be switched back to be controlled by the control circuit of main control board one and sub control board one, and the control circuit of main control board two and sub control board two returns to the redundant backup state, without master-slave distinction between the two control circuits, and all internal components and control programs are not different, and can be exchanged without disturbance at any time, so that the control system redundancy of the high voltage frequency converter parallel driving system is realized, and the operation reliability of the whole driving system is improved.

[0017] Embodiment:

[0018] According to the accompanying Figure 1The redundant control drive system described in the embodiment is provided with three high-voltage frequency converters, i.e., 1# frequency converter 1#VFD, 2# frequency converter 2#VFD and 3# frequency converter 3#VFD, which commonly drive a motor M. Each frequency converter is respectively provided with a sub-control board one and a sub-control board two (correspondingly 1# sub-control board one, 1# sub-control board two, 2# sub-control board one, 2# sub-control board two, 3# sub-control board one and 3# sub-control board two), a human-machine interface (HMI) and a programmable logic controller (PLC), wherein each sub-control board one is connected with the main control board one in the main control cabinet 1 through an optical fiber 3, each sub-control board two is connected with the main control board two in the main control cabinet 1 through an optical fiber 3, each sub-control board one and each sub-control board two are respectively provided with an independent current sampling circuit 4 to sample the output current of the corresponding frequency converter (1# frequency converter 1#VFD, 2# frequency converter 2#VFD and 3# frequency converter 3#VFD), and the three-phase output ends of the three frequency converters (1# frequency converter 1#VFD, 2# frequency converter 2#VFD and 3# frequency converter 3#VFD) are connected to the three-phase input end of the motor M in parallel through a smoothing reactor 6. The main control cabinet 1 is provided with the main control board one, the main control board two, the human-machine interface (HMI) and the programmable logic controller (PLC), the main control board one and the main control board two in the main control cabinet 1 have independent voltage sampling circuits 5 to sample the three-phase voltage input by the motor M, the programmable logic controllers (PLCs) of the three frequency converters (1# frequency converter 1#VFD, 2# frequency converter 2#VFD and 3# frequency converter 3#VFD) are connected with the programmable logic controller (PLC) of the main control cabinet 1 in a field bus 2 (DP / Profinet bus) mode to establish a communication connection, and then the programmable logic controller (PLC) of the main control cabinet 1 is connected with the external upper-layer host computer system (UCS) to establish a communication connection, the main control board one and the main control board two in the main control cabinet 1 are connected through an optical fiber 3 to establish a communication and synchronously control the running state of the main control system one and the main control system two.

[0019] When the main control system one in operation detects a fault in the current control circuit, including a fault in the main control system one or any one of the sub control system one and other components in the circuit, the fault information is reported to the main control system one immediately, at this time, the control circuit of the main control system two is in a redundant backup state, and the fault information is collected to the main control board one and then reported to the main control board two through optical fiber communication to request the main control board two to switch control. The main control board two confirms that the control circuit corresponding to the main control system two has no fault and is in a redundant backup state, and immediately takes over the driving system operation control right, and the driving system continues to be controlled by the corresponding control circuit of the main control system two and the sub control system two. The driving system will not be shut down unexpectedly due to the fault of the control circuit of the main control system one and the sub control system one. When the fault in the control circuit of the main control system one and the sub control system one is eliminated, the main control system two can initiate a reset application, the main control board two requests the main control board one to reset control through optical fiber communication, and the main control board one confirms that the control circuit of the main control system one and the sub control system one has no fault and is in a redundant backup state, and then switches to take over the driving system operation control right, and the driving system resumes operation control by the control circuit of the main control system one and the sub control system one, and the control circuit of the main control system two and the sub control system two resumes the redundant backup state.

[0020] The utility model discloses a plurality of high voltage frequency converters are connected in parallel and drive motor operation in common current output mode, improve the output power of frequency converter system, combine redundancy control design, improve the reliability of frequency converter drive system, make frequency converter can be applied to the application occasion of load exceeding its self -generated single capacity, and also realize the control system redundancy function of whole parallel system.

[0021] The above is only for further explaining and describing the technical scheme of the utility model, and is not a limitation of the utility model, and the person skilled in the art can certainly continue to make the combination of reducing or increasing, equivalent modification, change or equivalent replacement of the specific embodiment according to the content disclosed in the utility model, and these reducing or increasing combinations, equivalent modification, change or equivalent replacement should all belong to the protection scope of the utility model. The protection scope of the utility model is subject to the claims of the application.

Claims

1. A redundant control drive system for a high-voltage frequency converter based on a multi-machine parallel structure, characterized by: The application relates to a high-voltage frequency converter parallel driving system, which comprises a plurality of high-voltage frequency converters connected with a main control cabinet circuit respectively, wherein the plurality of high-voltage frequency converters are connected with a motor circuit in parallel to form a high-voltage frequency converter parallel driving system, the total rated output current value of the plurality of high-voltage frequency converters after parallel connection is greater than the rated output current value of a single frequency converter, the motor is driven by the common output current of the plurality of high-voltage frequency converters, the main control cabinet is provided with two sets of independent main control systems, each set of the main control systems is provided with an independent main control board, each of the high-voltage frequency converters is provided with two sets of independent sub-control systems, each set of the sub-control systems is provided with an independent sub-control board, the sub-control boards of the two sets of sub-control systems of the high-voltage frequency converters are connected with the main control boards of the two sets of main control systems one by one through optical fiber communication to form a control circuit of the two-way high-voltage frequency converter parallel driving system, the main control boards of the two sets of main control systems are also connected through optical fiber communication, each set of the main control systems is further provided with an output voltage sampling module, a communication module and an auxiliary power module and is connected with the corresponding main control board circuit, each set of the sub-control systems is further provided with a current voltage sampling module, a driving signal output module, a communication module and an auxiliary power module and is connected with the corresponding sub-control board circuit.

2. The redundant control drive system of a high-voltage frequency converter based on a multi-machine parallel structure according to claim 1, characterized in that: The control circuit of the two-way high-voltage frequency converter parallel driving system comprises one in-use control circuit and one redundant control circuit, when the in-use control circuit fails, the redundant control circuit is switched to the working state, when the failure is removed, the running redundant control circuit is reset to the redundant backup working state, and the in-use control circuit is switched to the working state, all the internal components and control programs of the in-use control circuit and the redundant control circuit are the same, and the switching is realized without disturbance.

3. The redundant control drive system of claim 1, wherein: Each set of the main control systems and the sub-control systems is further provided with a human-machine interface HMI and a programmable logic controller PLC respectively, the main control board in each set of the main control systems is further provided with an independent voltage sampling circuit for sampling the three-phase voltage input to the motor, the sub-control board in each set of the sub-control systems is further provided with an independent current sampling circuit for sampling the output current of the connected frequency converter, the programmable logic controllers PLC of the sub-control systems are connected with the programmable logic controllers PLC of the main control systems through field bus communication, and the programmable logic controllers PLC of the main control systems are connected with an upper computer system UCS outside.

4. The redundant control drive system of claim 1, wherein: The three-phase output ends of the plurality of high-voltage frequency converters are connected to the three-phase input ends of the motor through a smoothing reactor in parallel.

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