A method and system for switching and troubleshooting dual frequency converter starting devices

Abstract

This invention discloses a method and system for switching and handling faults of dual frequency converter starters, relating to the field of frequency converter starter control technology. The method includes: receiving a unit start command from monitoring; selecting a suitable frequency converter starter based on the current status of the dual frequency converter starters; controlling the switching switch to achieve unit start-up. The system pre-builds an electrical circuit to achieve bidirectional transmission of fault signals between the unit / unit excitation and the frequency converter starter. This invention reduces switching delay and signal processing time, improves system stability and reliability, effectively enhances the real-time performance and accuracy of fault handling, simplifies operator procedures, reduces the possibility of operational errors, improves system operating efficiency and safety, reduces the complexity of system maintenance and upgrades, enhances system maintainability and operability, optimizes the start-up process and coordination of energy equipment, and improves equipment utilization and operating efficiency.

Description

Technical Field

[0001] This invention relates to the field of variable frequency starter control technology, and in particular to a method and system for switching and troubleshooting dual variable frequency starters. Background Technology

[0002] Static frequency converters (SFCs) are crucial equipment for starting large water pumps. Variable frequency starting offers smooth, rapid, and reliable operation, eliminating step loss issues, providing excellent speed regulation performance, high success rate, and minimal maintenance. In the past, when the number of large water pump units was small, one SFC was generally sufficient for starting requirements. However, in recent years, with the increasing number of large water pump units, one SFC is no longer adequate for on-site starting needs. Most sites now employ two SFCs. When both SFCs are functioning correctly, they can independently control the starting of the corresponding unit. Conversely, if one SFC fails, the other SFC can control the starting of the unit on the faulty unit's side.

[0003] Existing technologies typically rely on manual or automatic switching mechanisms. When the primary variable frequency drive (VFD) starter fails, switching delays may occur, affecting the unit's startup and operation. Especially in automatic switching mechanisms, switching delays can prevent the unit from starting in a timely manner, impacting production or service continuity. In existing technologies, fault detection and handling may involve multiple steps and devices, increasing system complexity. Fault signals may need to pass through multiple control units and relays, potentially causing signal delays or processing errors. The limited number of inputs and outputs of the VFD starter may prevent it from processing multiple fault signals simultaneously. Existing technologies may require complex switching between fault signal processing and VFD starter control, leading to untimely or inaccurate fault signal processing. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by this invention is: how to quickly switch to the backup variable frequency starter for control to ensure that the unit can start normally.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a method for switching and troubleshooting a dual-frequency conversion starter device, including:

[0008] Determine the status of the No. 1 frequency converter starter. When the No. 1 frequency converter starter is fault-free and meets the start-up conditions, use the No. 1 frequency converter and start the unit on the side of the No. 1 frequency converter through the selector switch.

[0009] Determine the status of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start conditions, use the No. 2 frequency converter and start the unit on the side of the No. 2 frequency converter through the selector switch.

[0010] When the No. 1 inverter starter fails, and the No. 2 inverter starter is fault-free and meets the start-up conditions, the unit on the side of the No. 1 inverter starter is started by coordinating the selector switch and the tie switch.

[0011] When the No. 2 inverter starter fails, and the No. 1 inverter starter is fault-free and meets the start-up conditions, the unit on the side of the No. 2 inverter starter is started by coordinating the selector switch and the tie switch.

[0012] Based on the unit being started and the selected variable frequency starter, a fault electrical circuit is pre-built. When a fault occurs in the unit or the unit's excitation, the fault signal is directly transmitted to the variable frequency starter.

[0013] Depending on the unit being started and the selected variable frequency starter, the system will transmit the starting unit or the unit's excitation-related status information to the selected variable frequency starter, or transmit the selected variable frequency starter's related status information to the unit or the unit's excitation.

[0014] As a preferred solution for the switching and fault handling method of dual frequency conversion starter, wherein:

[0015] The process of determining the status of the No. 1 inverter starter, when the No. 1 inverter starter is fault-free and meets the start-up conditions, involves using the No. 1 inverter to start the units on the side of the No. 1 inverter via a selector switch, including:

[0016] The host computer sends a start-up command to the unit on the side of the No. 1 inverter starter. When the No. 1 inverter starter is fault-free and meets the start-up conditions, the corresponding selector switch of the unit is closed, and the No. 1 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the selector switch is closed.

[0017] As a preferred solution for the switching and fault handling method of dual frequency conversion starter, wherein:

[0018] The process of determining the status of the No. 2 inverter starter, and when the No. 2 inverter starter is fault-free and meets the start-up conditions, involves using the No. 2 inverter and starting the units on the side of the No. 2 inverter via a selector switch, including:

[0019] The host computer sends a start-up command to the unit on the side of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start-up conditions, the corresponding selector switch of the unit is closed, and the No. 2 frequency converter starter is used to control the start of the unit. After the frequency converter starter has finished starting, the selector switch is closed.

[0020] As a preferred solution for the switching and fault handling method of dual frequency conversion starter, wherein:

[0021] When the No. 1 inverter starter fails, and the No. 2 inverter starter is fault-free and meets the start-up conditions, starting the unit on the side of the No. 1 inverter starter by coordinating the selector switch and the tie switch includes:

[0022] The host computer sends a start-up command to the unit on the side of the No. 1 inverter starter. When the No. 1 inverter starter fails, and the No. 2 inverter starter is fault-free and meets the start-up conditions, the No. 2 inverter starter is selected, and the corresponding selection switch and tie switch of the unit are closed. The No. 2 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the unit selection switch is opened and the tie switch is closed.

[0023] As a preferred solution for the switching and fault handling method of dual frequency conversion starter, wherein:

[0024] When the No. 2 inverter starter fails, and the No. 1 inverter starter is functioning correctly and meets the start-up conditions, starting the unit on the side of the No. 2 inverter starter via the selector switch and the tie switch includes:

[0025] The host computer sends a start-up command to the unit on the side of the No. 2 inverter starter. When the No. 2 inverter starter fails, the No. 1 inverter starter is selected, and the corresponding selection switch and interconnection switch of the unit are closed. The No. 1 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the unit selection switch is opened and the interconnection switch is closed.

[0026] As a preferred solution for the switching and fault handling method of dual frequency conversion starter, wherein:

[0027] The step of pre-establishing a fault electrical circuit based on the started unit and the selected variable frequency starter, so that when a fault occurs in the unit or its excitation, the fault signal is directly transmitted to the variable frequency starter, includes:

[0028] Design an electrical circuit that pre-activates the unit selection relay and the frequency converter starter selects the relay mode. When a unit malfunctions, the fault signal is directly transmitted to the frequency converter starter without system processing.

[0029] As a preferred solution for the switching and fault handling method of dual frequency conversion starter, wherein:

[0030] The process of transmitting the started unit or unit excitation-related status information to the selected frequency converter, or transmitting the selected frequency converter's related status information to the unit or unit excitation device, based on the started unit and the selected frequency converter starting device, includes:

[0031] When a variable frequency starter drives multiple units to start, the variable frequency starter switching system identifies the current starting unit and the corresponding variable frequency starter, and forwards the unit information required by the variable frequency starter to the variable frequency starter. The variable frequency starter switching system determines the variable frequency starter corresponding to the current unit by the status of the unit's corresponding selection switch and tie switch, and transmits the unit information to the variable frequency starter.

[0032] Secondly, embodiments of the present invention provide a dual-frequency conversion starter switching and fault handling system, including:

[0033] The first judgment module is used to judge the status of the No. 1 frequency converter starter. When the No. 1 frequency converter starter is fault-free and meets the start conditions, the No. 1 frequency converter is used to start the unit on the side of the No. 1 frequency converter through the selector switch.

[0034] The second judgment module is used to judge the status of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start conditions, the No. 2 frequency converter is used to start the No. 2 frequency converter side unit through the selector switch.

[0035] The third judgment module is used to start the unit on the side of the No. 1 inverter starter when the No. 1 inverter starter fails and the No. 2 inverter starter is not faulty and meets the start conditions, by cooperating with the selector switch and the tie switch to start the unit on the side of the No. 1 inverter starter.

[0036] The fourth judgment module is used to start the unit on the side of the No. 2 inverter starter when the No. 2 inverter starter fails, the No. 1 inverter starter is not faulty and meets the start conditions, by cooperating with the selector switch and the tie switch.

[0037] The fault handling module is used to pre-build a fault electrical circuit based on the unit being started and the selected variable frequency starter. When a fault occurs in the unit or the unit excitation, the unit or the unit fault signal is directly transmitted to the variable frequency starter.

[0038] The information transmission module is used to transmit the starting unit or the unit excitation-related status information to the selected frequency converter, or to transmit the selected frequency converter's status information to the unit or the unit excitation, based on the starting unit and the selected frequency converter starting device.

[0039] Thirdly, embodiments of the present invention provide a computing device, including:

[0040] Memory and processor;

[0041] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the one or more programs are executed by the one or more processors, the one or more processors implement the dual-frequency conversion starter switching and fault handling method as described in any embodiment of the present invention.

[0042] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the aforementioned dual-frequency conversion starter switching and fault handling method.

[0043] The beneficial effects of this invention are as follows: This invention introduces intelligent switching control and a pre-built fault electrical circuit, enabling the system to quickly respond to and process status changes of the variable frequency starter and the generator unit, reducing switching delays and signal processing time, and improving system stability and reliability. The designed fault electrical circuit directly transmits generator fault signals to the variable frequency starter, avoiding signal processing delays and potential information loss, effectively improving the real-time performance and accuracy of fault handling. By automatically disabling redundant start-up commands and automatically selecting appropriate starter devices for control, the operating procedures for operators are simplified, reducing the possibility of operational errors and improving system operating efficiency and safety. The simplified system structure and integrated status information transmission mechanism reduce the complexity of system maintenance and upgrades, while optimizing control logic improves system maintainability and operability. Through precise coordinated operation of the generator unit and the variable frequency starter, the start-up process and coordination of energy equipment are optimized, improving equipment utilization and operating efficiency. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is an overall flowchart of the switching and fault handling method of the dual frequency conversion starter device described in the first embodiment of the present invention;

[0046] Figure 2 This is an electrical schematic diagram of the dual frequency conversion starting device of a water pump unit in Yunnan Province, in a simulation example of the switching and fault handling method of the dual frequency conversion starting device described in the second embodiment of the present invention.

[0047] Figure 3This is a simulation example of the switching and fault handling method of the dual frequency converter starting device described in the second embodiment of the present invention, showing the flow chart of the No. 1 frequency converter starting device starting the No. 1 frequency converter starting device side unit.

[0048] Figure 4 This is a simulation example of the switching and fault handling method of the dual frequency converter starting device described in the second embodiment of the present invention, showing the flow chart of the No. 2 frequency converter starting device starting the No. 1 frequency converter starting device side unit.

[0049] Figure 5 This is a schematic diagram of the electrical fault circuit in a simulation example of the switching and fault handling method of the dual frequency conversion starting device described in the second embodiment of the present invention. Detailed Implementation

[0050] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0051] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0052] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0053] Example 1

[0054] Reference Figure 1 This is the first embodiment of the present invention, which provides a method for switching and troubleshooting a dual-frequency converter starting device, including:

[0055] S1: Determine the status of the No. 1 frequency converter starter. When the No. 1 frequency converter starter is fault-free and meets the start conditions, use the No. 1 frequency converter and start the unit on the side of the No. 1 frequency converter through the selector switch.

[0056] In this embodiment of the application, determining the status of the No. 1 inverter starter, and when the No. 1 inverter starter is fault-free and meets the start-up conditions, using the No. 1 inverter to start the unit on the side of the No. 1 inverter via the selector switch includes:

[0057] The host computer sends a start-up command to the unit on the side of the No. 1 inverter starter. When the No. 1 inverter starter is fault-free and meets the start-up conditions, the corresponding selector switch of the unit is closed, and the No. 1 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the selector switch is closed.

[0058] In another possible implementation, if another start-up command is sent to the other units on the side of the No. 1 frequency converter starter during this process, the frequency converter starter switching system will automatically block the command and separate the selection switch after the frequency converter starter has finished starting.

[0059] S2: Determine the status of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start conditions, use the No. 2 frequency converter and start the unit on the side of the No. 2 frequency converter through the selector switch.

[0060] In this embodiment of the application, determining the status of the No. 2 inverter starter, and when the No. 2 inverter starter is fault-free and meets the start-up conditions, using the No. 2 inverter to start the unit on the side of the No. 2 inverter via a selector switch includes:

[0061] The host computer sends a start-up command to the unit on the side of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start-up conditions, the corresponding selector switch of the unit is closed, and the No. 2 frequency converter starter is used to control the start of the unit. After the frequency converter starter has finished starting, the selector switch is closed.

[0062] In another possible implementation, if a start-up command for the other units on the side of the No. 2 frequency converter starter is sent during this process, the frequency converter starter switching system will automatically block the command and separate the selection switch after the frequency converter starter has finished starting.

[0063] S3: When the No. 1 inverter starter fails and the No. 2 inverter starter is fault-free and meets the start conditions, the unit on the side of the No. 1 inverter starter is started by coordinating the selector switch and the tie switch.

[0064] In this embodiment of the application, when the No. 1 inverter starter fails and the No. 2 inverter starter is fault-free and meets the start-up conditions, starting the unit on the side of the No. 1 inverter by coordinating the selector switch and the tie switch includes:

[0065] The host computer sends a start-up command to the unit on the side of the No. 1 inverter starter. When the No. 1 inverter starter fails, and the No. 2 inverter starter is fault-free and meets the start-up conditions, the No. 2 inverter starter is selected, and the corresponding selection switch and tie switch of the unit are closed. The No. 2 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the unit selection switch is opened and the tie switch is closed.

[0066] In another possible implementation, if any unit start-up command is sent during this process, the frequency converter starter switching system will automatically block the command and wait for the frequency converter starter to finish starting before disconnecting the unit selection switch and the interconnection switch.

[0067] S4: When the No. 2 inverter starter fails, and the No. 1 inverter starter is fault-free and meets the start-up conditions, the unit on the side of the No. 2 inverter starter is started by coordinating the selector switch and the tie switch.

[0068] In this embodiment of the application, when the No. 2 inverter starter fails, and the No. 1 inverter starter is fault-free and meets the start-up conditions, starting the unit on the side of the No. 2 inverter starter by coordinating the selector switch and the tie switch includes:

[0069] The host computer sends a start-up command to the unit on the side of the No. 2 inverter starter. When the No. 2 inverter starter fails, the No. 1 inverter starter is selected, and the corresponding selection switch and interconnection switch of the unit are closed. The No. 1 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the unit selection switch is opened and the interconnection switch is closed.

[0070] In another possible implementation, if any unit start-up command is sent during this process, the frequency converter starter switching system will automatically block the command and wait for the frequency converter starter to finish starting before disconnecting the unit selection switch and closing the interconnection switch.

[0071] S5: Based on the unit being started and the selected variable frequency starter, a fault electrical circuit is pre-built. When a fault occurs in the unit or the unit's excitation, the fault signal of the unit or the unit is directly transmitted to the variable frequency starter.

[0072] In this embodiment, a fault electrical circuit is pre-established based on the unit being started and the selected variable frequency starter. When a fault occurs in the unit or its excitation, the fault signal is directly transmitted to the variable frequency starter, including:

[0073] Design an electrical circuit that pre-activates the unit selection relay and the frequency converter starter selects the relay mode. When a unit malfunctions, the fault signal is directly transmitted to the frequency converter starter without system processing.

[0074] It should be noted that, due to the limited number of I / Os of the variable frequency starter, only one set of fault signals can be connected. In order to avoid the delay caused by the fault signal switching the system through the variable frequency starter, an electrical circuit is designed. By pre-activating the unit selection relay, the variable frequency starter selects the relay mode. When the unit fails, the fault signal can be directly transmitted to the variable frequency starter without going through the system processing.

[0075] S6: Based on the unit being started and the selected variable frequency starter, the system will transmit the starting unit or the unit excitation-related status information to the selected variable frequency starter, or transmit the selected variable frequency starter-related status information to the unit or the unit excitation.

[0076] In this embodiment of the application, based on the started unit and the selected variable frequency starter, the system transmits the started unit or unit excitation-related status information to the selected variable frequency starter, or transmits the selected variable frequency starter-related status information to the unit or unit excitation, including:

[0077] When a variable frequency starter drives multiple units to start, the variable frequency starter switching system identifies the current starting unit and the corresponding variable frequency starter, and forwards the unit information required by the variable frequency starter to the variable frequency starter. The variable frequency starter switching system determines the variable frequency starter corresponding to the current unit by the status of the unit's corresponding selection switch and tie switch, and transmits the unit information to the variable frequency starter.

[0078] It should be noted that when a variable frequency drive (VFD) starter drives multiple generator units, because the number of I / O pins of the VFD starter is limited, it can only receive one set of generator unit information signals. Therefore, the VFD starter switching system needs to identify the currently starting generator unit and its corresponding VFD starter, and forward the generator unit information required by the VFD starter to it. The VFD starter switching system determines the corresponding VFD starter for the current generator unit by checking the status of the generator unit's corresponding selection switch and tie switch, and then transmits the generator unit information to the VFD starter.

[0079] The above is a schematic scheme of the dual-frequency converter starter switching and fault handling method of this embodiment. It should be noted that the technical solution of the dual-frequency converter starter switching and fault handling system and the technical solution of the above-described dual-frequency converter starter switching and fault handling method belong to the same concept. For details not described in detail in the technical solution of the dual-frequency converter starter switching and fault handling system in this embodiment, please refer to the description of the technical solution of the above-described dual-frequency converter starter switching and fault handling method.

[0080] The dual-frequency conversion starter switching and fault handling system in this embodiment includes:

[0081] The first judgment module is used to judge the status of the No. 1 frequency converter starter. When the No. 1 frequency converter starter is fault-free and meets the start conditions, the No. 1 frequency converter is used to start the unit on the side of the No. 1 frequency converter through the selector switch.

[0082] The second judgment module is used to judge the status of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start conditions, the No. 2 frequency converter is used to start the No. 2 frequency converter side unit through the selector switch.

[0083] The third judgment module is used to start the unit on the side of the No. 1 inverter starter when the No. 1 inverter starter fails and the No. 2 inverter starter is not faulty and meets the start conditions, by cooperating with the selector switch and the tie switch to start the unit on the side of the No. 1 inverter starter.

[0084] The fourth judgment module is used to start the unit on the side of the No. 2 inverter starter when the No. 2 inverter starter fails, the No. 1 inverter starter is not faulty and meets the start conditions, by cooperating with the selector switch and the tie switch.

[0085] The fault handling module is used to pre-build a fault electrical circuit based on the unit being started and the selected variable frequency starter. When a fault occurs in the unit or the unit excitation, the unit or the unit fault signal is directly transmitted to the variable frequency starter.

[0086] The information transmission module is used to transmit the starting unit or the unit excitation-related status information to the selected frequency converter, or to transmit the selected frequency converter's status information to the unit or the unit excitation, based on the starting unit and the selected frequency converter starting device.

[0087] This embodiment also provides a computing device applicable to situations involving switching and fault handling of dual-frequency conversion start-up devices, including:

[0088] The system includes a memory and a processor. The memory stores computer-executable instructions, and the processor executes these instructions to implement the switching and fault handling method for the dual-frequency conversion starter device as described in the above embodiments.

[0089] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, it implements the dual-frequency conversion starter switching and fault handling method proposed in the above embodiments.

[0090] The storage medium proposed in this embodiment and the dual-frequency conversion starter switching and fault handling method proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0091] Example 2

[0092] Reference Figures 2-5 As an embodiment of the present invention, a method for switching and fault handling of a dual frequency conversion starting device is provided. In order to verify the beneficial effects of the present invention, a simulation experiment is conducted for scientific demonstration.

[0093] This invention has been used in a water pump unit in Yunnan Province, and it can meet the on-site unit start-up requirements and realize the mutual switching of variable frequency start-up devices. The details are further described in conjunction with the accompanying drawings.

[0094] Figure 2This is the electrical schematic diagram of the dual frequency conversion starter for a water pump unit in Yunnan. There are two sets of frequency conversion starters in the project: No. 1 frequency conversion starter and No. 2 frequency conversion starter, which correspond to the starter unit on the side of No. 1 frequency conversion starter and the starter unit on the side of No. 2 frequency conversion starter, respectively.

[0095] Figure 3 This is a flowchart showing the LCU sending the start-up command to Unit 1 when the No. 1 frequency converter start-up device is fault-free. The start-up steps of the frequency converter are as follows:

[0096] Step 1: The system performs a status check. When the No. 1 frequency converter is fault-free and meets the start-up conditions, and the No. 1 unit meets the start-up conditions, the No. 1 frequency converter is used to start the unit, and the No. 1 unit selection switch closing command is issued.

[0097] Step 2: The system waits for the status feedback of the selector switch and tie switch of Unit 1. When it receives the status signals of the selector switch being closed and the tie switch being open, it issues a start command for the frequency converter.

[0098] Step 3: During startup, the excitation information of Unit 1 / Unit 1 will be exchanged with the No. 1 frequency converter startup device in real time.

[0099] Step 4: After startup is complete, disconnect the unit selection switch and start the next unit.

[0100] Figure 4 The flowchart shows the LCU sending the start-up command to Unit 1 when the No. 1 inverter starter fails and the No. 2 inverter starter is functioning correctly. The start-up steps of the inverter starter are as follows:

[0101] Step 1: The system performs a status check. When there is a fault in the No. 1 frequency converter, and the No. 2 frequency converter starter is fault-free and meets the start-up conditions, and the No. 1 unit meets the start-up conditions, the No. 2 frequency converter is used to start the unit, and the No. 1 unit selection switch closing command and communication switch closing command are issued.

[0102] Step 2: The system waits for the status feedback of the selector switch and tie switch of Unit 1. When it receives the status signals of the selector switch being closed and the tie switch being closed, it issues a start command for the frequency converter starter.

[0103] Step 3: During startup, the excitation information of Unit 1 / Unit 2 will be exchanged in real time with the frequency converter startup device No. 2.

[0104] Step 4: After the No. 2 frequency converter starter has started, disconnect the No. 1 unit selection switch and the tie switch, and wait for the start command to start the next unit.

[0105] Figure 5This is a schematic diagram of an electrical fault circuit. The system constructs an electrical fault circuit as shown in the figure. During the unit startup process, the corresponding unit relay and variable frequency starter relay are activated. When a unit / unit excitation fault signal arrives, it can be directly transmitted to the variable frequency starter, or when a variable frequency starter fault signal arrives, it can be directly transmitted to the unit / unit excitation.

[0106] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for switching and troubleshooting a dual-frequency conversion starting device, characterized in that, include: Determine the status of the No. 1 frequency converter starter. When the No. 1 frequency converter starter is fault-free and meets the start-up conditions, use the No. 1 frequency converter and start the unit on the side of the No. 1 frequency converter through the selector switch. Determine the status of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start conditions, use the No. 2 frequency converter and start the unit on the side of the No. 2 frequency converter through the selector switch. When the No. 1 inverter starter fails, and the No. 2 inverter starter is fault-free and meets the start-up conditions, the unit on the side of the No. 1 inverter starter is started by coordinating the selector switch and the tie switch. When the No. 2 inverter starter fails, and the No. 1 inverter starter is fault-free and meets the start-up conditions, the unit on the side of the No. 2 inverter starter is started by coordinating the selector switch and the tie switch. Based on the unit being started and the selected variable frequency starter, a fault electrical circuit is pre-built. When a fault occurs in the unit or the unit's excitation, the fault signal is directly transmitted to the variable frequency starter. Depending on the unit being started and the selected variable frequency starter, the system will transmit the starting unit or the unit's excitation-related status information to the selected variable frequency starter, or transmit the selected variable frequency starter's related status information to the unit or the unit's excitation.

2. The method for switching and troubleshooting dual-frequency conversion starter as described in claim 1, characterized in that, The process of determining the status of the No. 1 inverter starter, when the No. 1 inverter starter is fault-free and meets the start-up conditions, involves using the No. 1 inverter to start the units on the side of the No. 1 inverter via a selector switch, including: The host computer sends a start-up command to the unit on the side of the No. 1 inverter starter. When the No. 1 inverter starter is fault-free and meets the start-up conditions, the corresponding selector switch of the unit is closed, and the No. 1 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the selector switch is closed.

3. The method for switching and troubleshooting dual-frequency conversion starter as described in claim 2, characterized in that, The process of determining the status of the No. 2 inverter starter, and when the No. 2 inverter starter is fault-free and meets the start-up conditions, involves using the No. 2 inverter and starting the units on the side of the No. 2 inverter via a selector switch, including: The host computer sends a start-up command to the unit on the side of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start-up conditions, the corresponding selector switch of the unit is closed, and the No. 2 frequency converter starter is used to control the start of the unit. After the frequency converter starter has finished starting, the selector switch is closed.

4. The method for switching and troubleshooting dual-frequency conversion starter as described in claim 3, characterized in that, When the No. 1 inverter starter fails, and the No. 2 inverter starter is fault-free and meets the start-up conditions, starting the unit on the side of the No. 1 inverter starter by coordinating the selector switch and the tie switch includes: The host computer sends a start-up command to the unit on the side of the No. 1 inverter starter. When the No. 1 inverter starter fails, and the No. 2 inverter starter is fault-free and meets the start-up conditions, the No. 2 inverter starter is selected, and the corresponding selection switch and tie switch of the unit are closed. The No. 2 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the unit selection switch is opened and the tie switch is closed.

5. The method for switching and troubleshooting dual-frequency conversion starter as described in claim 4, characterized in that, When the No. 2 inverter starter fails, and the No. 1 inverter starter is functioning correctly and meets the start-up conditions, starting the unit on the side of the No. 2 inverter starter via the selector switch and the tie switch includes: The host computer sends a start-up command to the unit on the side of the No. 2 inverter starter. When the No. 2 inverter starter fails, the No. 1 inverter starter is selected, and the corresponding selection switch and interconnection switch of the unit are closed. The No. 1 inverter starter is used to control the start of the unit. After the inverter starter has finished starting, the unit selection switch is opened and the interconnection switch is closed.

6. The method for switching and troubleshooting dual-frequency conversion starter as described in claim 5, characterized in that, The step of pre-establishing a fault electrical circuit based on the started unit and the selected variable frequency starter, so that when a fault occurs in the unit or its excitation, the fault signal is directly transmitted to the variable frequency starter, includes: Design an electrical circuit that pre-activates the unit selection relay and the frequency converter starter selects the relay mode. When a unit malfunctions, the fault signal is directly transmitted to the frequency converter starter without system processing.

7. The method for switching and troubleshooting dual-frequency conversion starter as described in claim 6, characterized in that, The process of transmitting the started unit or unit excitation-related status information to the selected frequency converter, or transmitting the selected frequency converter's related status information to the unit or unit excitation device, based on the started unit and the selected frequency converter starting device, includes: When a variable frequency starter drives multiple units to start, the variable frequency starter switching system identifies the current starting unit and the corresponding variable frequency starter, and forwards the unit information required by the variable frequency starter to the variable frequency starter. The variable frequency starter switching system determines the variable frequency starter corresponding to the current unit by the status of the unit's corresponding selection switch and tie switch, and transmits the unit information to the variable frequency starter.

8. A system employing the switching and fault handling method for a dual-frequency conversion starter as described in any one of claims 1 to 7, characterized in that, include: The first judgment module is used to judge the status of the No. 1 frequency converter starter. When the No. 1 frequency converter starter is fault-free and meets the start conditions, the No. 1 frequency converter is used to start the unit on the side of the No. 1 frequency converter through the selector switch. The second judgment module is used to judge the status of the No. 2 frequency converter starter. When the No. 2 frequency converter starter is fault-free and meets the start conditions, the No. 2 frequency converter is used to start the No. 2 frequency converter side unit through the selector switch. The third judgment module is used to start the unit on the side of the No. 1 inverter starter when the No. 1 inverter starter fails and the No. 2 inverter starter is not faulty and meets the start conditions, by cooperating with the selector switch and the tie switch to start the unit on the side of the No. 1 inverter starter. The fourth judgment module is used to start the unit on the side of the No. 2 inverter starter when the No. 2 inverter starter fails, the No. 1 inverter starter is not faulty and meets the start conditions, by cooperating with the selector switch and the tie switch. The fault handling module is used to pre-build a fault electrical circuit based on the unit being started and the selected variable frequency starter. When a fault occurs in the unit or the unit excitation, the unit or the unit fault signal is directly transmitted to the variable frequency starter. The information transmission module is used to transmit the starting unit or the unit excitation-related status information to the selected frequency converter, or to transmit the selected frequency converter's status information to the unit or the unit excitation, based on the starting unit and the selected frequency converter starting device.

9. A computing device, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, they implement the steps of the switching and fault handling method of the dual frequency conversion starter device according to any one of claims 1 to 7.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the dual-frequency conversion starter switching and fault handling method according to any one of claims 1 to 7.

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