Double-machine hot redundancy multi-drive frequency converter system

Abstract

The utility model discloses a double-machine hot redundancy multi-drive frequency converter system, which belongs to the technical field of frequency converters and comprises n double-machine redundancy units, each double-machine redundancy unit comprises two frequency converters and an I / O (input / output) controller, the two frequency converters are connected to the same main power supply through wire inlet switches and are connected to the same motor through wire outlet switches, and the I / O controller is connected to the main power supply through wire outlet switches. The two frequency converters and the I / O controller are connected through a high-speed communication bus, and the I / O controller controls outgoing line switches of the two frequency converters; the two frequency converters exchange frequency converter states and control variables through high-speed communication, and the I / O controller serves as an external interface of the dual-machine redundancy unit; all the frequency converters in the system are connected through a communication bus and are used for multi-drive master-slave control. According to the utility model, each motor load in the multi-drive system is equipped with a dual-machine redundancy unit, and multi-drive master-slave control is also realized under the condition of dual-machine redundancy.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, specifically to a dual-machine thermal redundancy multi-drive frequency converter system. Background Technology

[0002] Multi-drive technology of frequency converters is a key development direction in the field of industrial automation. Its core objective is to achieve efficient, precise and energy-saving operation in complex production scenarios by coordinating the control of multiple motors by multiple frequency converters. It is widely used in scenarios such as metallurgical rolling, textile drawing, conveyor belt linkage, and fan and pump group control.

[0003] In high-risk industries such as chemical, petrochemical, and nuclear power, downtime of critical equipment can lead to significant economic losses or even safety accidents. For example, chemical production equipment often experiences inverter failures due to the harsh environment. If a single inverter is used, a shutdown due to a failure will directly interrupt the process, causing huge economic losses. To address this industrial scenario, the industry has proposed dual-machine redundancy technology for inverters. After the main inverter fails, a backup inverter is activated to ensure continuous production. Early cold redundancy solutions required shutdown before activating the backup unit, resulting in long switching times, large speed fluctuations, sudden changes in airflow, mechanical damage to equipment, and voltage flicker in the power grid. Some dual-inverter systems lack high-speed communication and synchronous control strategies, leading to circulating current phenomena, reducing system efficiency and accelerating component aging. To address these issues, dual-machine hot redundancy inverter technology has gained industry attention for its seamless switching, optimized redundancy architecture, and intelligent fault-tolerant management.

[0004] In some high-continuity production sectors, multi-drive systems are also critical equipment. For example, conveyor belts in the chemical industry require redundancy to prevent production interruptions, equipment damage, or even safety accidents. However, currently available technical solutions rarely apply dual-machine redundancy technology to multi-drive systems. Furthermore, typical frequency converters have built-in analog input, analog output, digital input, digital output, and relay output functions. For dual-machine systems, this adds an extra I / O interface, increasing the complexity of user wiring and control. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the aforementioned multi-drive inverter systems by providing a dual-machine hot-redundant multi-drive inverter system. This system equips each motor load in the multi-drive system with a dual-machine redundancy unit. The two inverters in the unit are hot-standby redundant for each other. In the case of dual-machine redundancy, multi-drive master-slave control is also realized. After the working inverter fails, it quickly switches to the standby inverter, disconnects the outgoing switch of the faulty inverter, and automatically realizes bumpless switching and isolation of the faulty inverter. By introducing an I / O controller, the user only needs to treat the dual inverter system as a single inverter for wiring and control, reducing the wiring in the cabinet and other control circuits.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A dual-machine thermal redundancy multi-drive frequency converter system includes n dual-machine redundancy units, where n is an integer greater than or equal to 2. Each dual-machine redundancy unit includes two frequency converters and one I / O controller. Both frequency converters have input switches at their input terminals and output switches at their output terminals. The two frequency converters are connected to the same main power supply through their respective input switches and connected to the same motor through their respective output switches. The two frequency converters are redundant, with one serving as the operating frequency converter and the other as the standby frequency converter. The two frequency converters and the I / O controller are connected via a high-speed communication bus. The I / O controller includes relays, and the relays of the I / O controller are connected to the control coils of the output switches of the two frequency converters via control lines. All frequency converters in all dual-machine redundancy units are connected via a single communication bus.

[0008] Furthermore, the two frequency converters in each dual-machine redundant unit exchange frequency converter status and control variables through high-speed communication for output voltage synchronization and redundancy switching.

[0009] Furthermore, the I / O controller in each dual-redundant unit acquires digital and analog signals and sends their digital values ​​to the working and standby frequency converters via high-speed communication. The working frequency converter sends the external digital and analog signal values ​​and relay switching commands to the I / O controller output via high-speed communication. The working frequency converter controls the on / off switching of the outgoing switches of the two frequency converters through the relays of the I / O controller. The standby frequency converter does not send data to the I / O controller. The I / O controller provides the user with an RS485 communication interface, and the user controls the dual-redundant unit and obtains its status through RS485 communication.

[0010] Furthermore, on the communication bus connecting all frequency converters in all dual-machine redundant units, the communication addresses and master-slave configurations of the two frequency converters in the same dual-machine redundant unit are the same, while the communication addresses and master-slave configurations of the frequency converters in different dual-machine redundant units are different. The working frequency converter sends and receives data on the communication bus, while the standby frequency converter only receives data on the communication bus.

[0011] Furthermore, the high-speed communication bus between the two frequency converters and I / O controllers in each dual-machine redundant unit is a CAN bus, using the CAN FD protocol.

[0012] Furthermore, the communication bus connecting all frequency converters in all dual-redundant units is RS485 communication.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model equips each motor load with a dual-redundant unit, which improves system reliability and reduces the failure rate;

[0015] 2. In this utility model, there is no fixed working frequency converter or standby frequency converter among the two frequency converters; either one can be the working frequency converter.

[0016] 3. In this utility model, the two frequency converters in the dual-machine redundancy unit use CAN communication and CAN FD protocol to communicate with each other. The standby frequency converter can obtain the status and control variables of the working frequency converter in a timely manner and complete the synchronization and redundancy switching in a very short time.

[0017] 4. This utility model can quickly switch to a backup inverter after the inverter fails, achieving a seamless switchover without affecting the normal operation of the equipment;

[0018] 5. This utility model automatically disconnects the outgoing switch of the faulty frequency converter, realizing fault isolation and avoiding secondary faults;

[0019] 6. After disconnecting the corresponding incoming line switch, the faulty frequency converter can be removed, repaired, or the wiring can be replaced. After closing the corresponding incoming line switch, hot standby redundancy is automatically restored without affecting the normal operation of the equipment.

[0020] 7. This utility model introduces an I / O controller, so users only need to treat the dual-machine redundant unit as a single frequency converter for wiring and control, which reduces the complexity of the utility model and reduces wiring and other control circuits in the cabinet.

[0021] 8. The communication parameters and master-slave configuration of the two frequency converters in the dual-machine redundancy unit of this utility model are set to be consistent, which reduces the parameter configuration of the dual-machine hot redundancy multi-drive system. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of an embodiment of a dual-machine thermal redundancy multi-drive frequency converter system provided by this utility model;

[0024] Figure 2 This is a schematic diagram of an embodiment of a dual-machine thermal redundancy multi-drive frequency converter system with two dual-machine redundant units provided by this utility model. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, any changes that fall within the spirit and scope of the present invention as defined and determined by the appended claims are obvious. All inventions utilizing the concept of the present invention are protected.

[0026] Figure 1 This is a schematic diagram of an embodiment of a dual-machine thermal redundancy multi-drive frequency converter system provided by this utility model. Figure 1 As shown, a dual-machine hot-redundant multi-drive frequency converter system includes dual-machine redundancy unit 1, dual-machine redundancy unit 2, ..., dual-machine redundancy unit n, where n is an integer greater than or equal to 2. Each dual-machine redundancy unit includes two frequency converters and one I / O controller. Both frequency converters have input switches at their input terminals and output switches at their output terminals. The two frequency converters are connected to the same main power supply through their respective input switches and connected to the same motor through their respective output switches. The following explanation uses dual-machine redundancy unit n as an example. Figure 1 The dual-machine redundancy unit n includes frequency converters VFDAn and VFDBn, and I / O controller n. The incoming switch QFAn of VFDAn and the incoming switch QFBn of VFDBn are connected to AC power ACn. The outgoing switch KMAn of VFDAn and the outgoing switch KMBn of VFDBn are connected to motor Mn. The frequency converters VFDAn and VFDBn are redundant, with one being the working frequency converter and the other being the standby frequency converter. VFDAn, VFDBn, and I / O controller n are connected through a high-speed communication bus CANn. The I / O controller n contains relays, and the relays of the I / O controller n are connected to the control coils of the outgoing switches KMAn and KMBn of the two frequency converters through control lines. All frequency converters in all dual-machine redundancy units are connected through a single communication bus, i.e., VFDA1, VFDB1, VFDA2, VFDB2, ..., VFDAn, VFDBn are connected through an RS485 bus.

[0027] To more clearly illustrate the dual-machine thermal redundancy multi-drive frequency converter system provided by this utility model, the following detailed description uses two dual-machine redundant units (i.e., n=2) as an example. For those skilled in the art, it is easy to extend this to the case of n>2. Figure 2 A schematic diagram of an embodiment of a dual-machine thermal redundancy multi-drive frequency converter system with two dual-machine redundant units provided by this utility model is given.

[0028] Figure 2In this dual-machine redundancy unit 1, frequency converters VFDA1 and VFDB1 and I / O controller 1 are included. The incoming line switches QFA1 and QFB1 of VFDA1 and VFDB1 are connected to AC power AC1. The outgoing line switches KMA1 and KMB1 of VFDA1 and VFDB1 are connected to motor M1. Frequency converters VFDA1 and VFDB1 are redundant, with one serving as the operating frequency converter and the other as a standby. VFDA1, VFDB1, and I / O controller 1 are connected via a high-speed communication bus CAN1. I / O controller 1 includes relays, which are connected to the control coils of the outgoing line switches KMA1 and KMB1 of the two frequency converters via control lines. Frequency converters VFDA1 and VFDB1 exchange frequency converter status and control variables via high-speed communication for output voltage synchronization and redundancy switching. I / O controller 1 acquires digital and analog signals and transmits the digital values ​​to the working and standby frequency converters via high-speed communication for their control. The working frequency converter sends the external digital and analog signals and relay switching commands to I / O controller 1 via high-speed communication. The working frequency converter controls the on / off state of outgoing switches KMA1 and KMB1 through the relays of I / O controller 1. The standby frequency converter does not send data to I / O controller 1. I / O controller 1 provides an RS485 communication interface for users to control dual-redundant unit 1 and obtain its status. To achieve faster output voltage synchronization and redundancy switching, the CAN1 communication bus between VFDA1, VFDB1, and I / O controller 1 adopts the CANFD protocol. The above description of dual-redundant unit 1 also applies to dual-redundant unit 2, and will not be repeated here.

[0029] All frequency converters in dual-redundant units 1 and 2 are connected via a single communication bus; specifically, VFDA1, VFDB1, VFDA2, and VFDB2 are connected via an RS485 bus. On this communication bus, the communication addresses of VFDA1 and VFDB1 are the same as in the master-slave configuration, as are those of VFDA2 and VFDB2. However, the communication addresses of VFDA1 / VFDB1 and VFDA2 / VFDB2 are different from their master-slave configurations. The operating frequency converters send and receive data on this communication bus, while the standby frequency converters only receive data.

[0030] Although specific embodiments of this utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A dual hot-redundant multi-drive frequency converter system, comprising: The double-machine redundancy unit includes two frequency converters and an I / O controller, the incoming line end of the two frequency converters is provided with an incoming line switch, the outgoing line end of the two frequency converters is provided with an outgoing line switch, the two frequency converters are connected to the same main power supply through the respective incoming line switches, the two frequency converters are connected to the same motor through the respective outgoing line switches, the two frequency converters are redundant to each other, one of which is a working frequency converter, and the other is a standby frequency converter, the two frequency converters and the I / O controller are connected by a high-speed communication bus, the I / O controller includes a relay, and the relay of the I / O controller is connected to the control coil of the outgoing line switch of the two frequency converters through a control line; all the frequency converters of all the double-machine redundancy units are connected by a communication bus.

2. The dual hot-redundant multi-drive variable frequency drive system of claim 1, wherein, The two frequency converters in each double-machine redundancy unit exchange frequency converter states and control variables through high-speed communication, for output voltage synchronization and redundancy switching.

3. The dual hot-redundant multi-drive variable frequency drive system of claim 1, wherein, The I / O controller in each double-machine redundancy unit collects digital and analog signals and sends the digital quantities to the working frequency converter and the standby frequency converter through high-speed communication, the working frequency converter sends the outgoing digital and analog signal digital quantities and the relay switch command to the I / O controller output through high-speed communication, the working frequency converter controls the on-off of the outgoing line switch of the two frequency converters through the relay of the I / O controller, the standby frequency converter does not send data to the I / O controller, the I / O controller provides an RS485 communication interface for the user, and the user controls the double-machine redundancy unit and obtains its state through RS485 communication.

4. The dual hot-redundant multi-drive variable frequency drive system of claim 1, wherein, On the communication bus connecting all the frequency converters of all the double-machine redundancy units, the communication addresses of the two frequency converters in the same double-machine redundancy unit are the same as the master-slave configuration, the communication addresses of the frequency converters of different double-machine redundancy units are different from the master-slave configuration, the working frequency converter sends and receives data on the communication bus, and the standby frequency converter only receives data on the communication bus.

5. The dual hot-redundant multi-drive variable frequency drive system of claim 1, wherein, The high-speed communication bus between the two frequency converters and the I / O controller in each double-machine redundancy unit is a CAN bus, and the CAN FD protocol is used.

6. The dual hot-redundant multi-drive variable frequency drive system of claim 1, wherein, The communication bus connecting all the frequency converters of all the double-machine redundancy units is RS485 communication.

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