A high voltage frequency conversion system seamless switching device and method

Abstract

The present invention discloses a high-voltage frequency conversion system seamless switching device and method, including a main control system, a first frequency converter system, a second frequency converter system, a switching device and a high-voltage motor; the switching device is controlled by the main control system and is connected to the input ends of the first frequency converter system and the second frequency converter system, and the switching device is controlled by the main control system to switch the power supply of the first frequency converter system and the second frequency converter system; the output ends of the first frequency converter system and the second frequency converter system are respectively connected to the high-voltage motor. In this solution, the new frequency converter system can be used as a backup for the old frequency converter system, and the new and old systems can be switched for use, so that the high-voltage frequency converter system of the main inclined shaft belt conveyor of the coal mine user can be replaced without stopping production, which guarantees the reliability of the drive of the main inclined shaft belt conveyor of the coal mine to the greatest extent.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical control, and in particular to a device and method for seamless switching of a high-voltage frequency converter system of a main inclined shaft belt conveyor in a coal mine. Background Art

[0002] The main inclined shaft belt conveyor is the main transportation route of the coal mine. Whether it is normal or not directly determines the normal coal output of the coal mine. As time goes by, the main inclined shaft belt conveyor of the coal mine is gradually facing the risk of stopping production due to the expiration of the high-voltage inverter. If the inverter is replaced directly, the old inverter needs to be removed and the new inverter needs to be installed and debugged. This process will cause the coal mine user to stop production and cause huge economic losses to the user.

[0003] It can be seen that how to improve the reliability of the belt conveyor drive in the main inclined shaft of a coal mine to reduce economic losses is a problem that needs to be solved in this field. Summary of the invention

[0004] In view of the technical problem that the existing high-voltage frequency converters in the main inclined shaft of coal mines have low reliability, the purpose of the present invention is to provide a device for seamless switching of the high-voltage frequency converter system of the belt conveyor in the main inclined shaft of coal mines, which can realize the replacement of the high-voltage frequency converter system of the main inclined shaft belt conveyor of coal mine users without stopping production, and the new frequency converter system can be used as a backup for the old frequency converter system, and the new and old systems can be switched between use, thereby ensuring the reliability of the drive of the belt conveyor in the main inclined shaft of coal mines to the greatest extent; on this basis, a method for seamless switching is also given, which well overcomes the methods existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a seamless switching device for a high-voltage frequency conversion system, comprising a main control system, a first frequency converter system, a second frequency converter system, a switching device and a high-voltage motor; the switching device is controlled by the main control system and is connected with the input ends of the first frequency converter system and the second frequency converter system, and the switching device is controlled by the main control system to switch the power supply of the first frequency converter system and the second frequency converter system on and off; the output ends of the first frequency converter system and the second frequency converter system are respectively connected with the high-voltage motor.

[0006] Further, the switching device includes an intermediate relay, a first bus repeater, a second bus repeater, and a third bus repeater; the first bus repeater input end is connected to the main control system, the first bus repeater receives the bus of the main control system and separates two buses;

[0007] The second bus repeater and the third bus repeater are respectively connected to the two buses at the output end of the first bus repeater; the second bus repeater and the third bus repeater are respectively connected to the first frequency converter system and the second frequency converter system;

[0008] The intermediate relay is controlled by the main control system and drives the second bus repeater and the third bus repeater to control the closing of the second bus repeater or the third bus repeater.

[0009] Furthermore, the first inverter system includes a first high-voltage power distribution system, a first high-voltage inverter system and a first inverter master-slave switching cabinet; the first high-voltage power distribution system is respectively connected to the first high-voltage inverter system and the second inverter system to provide power for them; the first inverter master-slave switching cabinet is controlled by the main control system and driven to connect to the first high-voltage inverter system; the first high-voltage inverter system is connected to the high-voltage motor.

[0010] Furthermore, the first high-voltage inverter system includes at least three high-voltage inverters; the high-voltage motor includes at least two high-voltage motors; the number of high-voltage inverters is one more than the number of high-voltage motors; the plurality of high-voltage inverters are correspondingly connected to the plurality of high-voltage motors, and the extra high-voltage inverter is a backup inverter.

[0011] Furthermore, a first high-voltage inverter switching cabinet system is provided between the first high-voltage inverter system and the high-voltage motor; the first high-voltage inverter switching cabinet system includes at least two high-voltage frequency conversion switching cabinets and are respectively connected to the high-voltage inverters in the first high-voltage inverter system; when any high-voltage inverter fails, the corresponding high-voltage frequency conversion switching cabinet switches the standby high-voltage inverter to establish a circuit connection with the corresponding high-voltage motor.

[0012] Furthermore, the second inverter system includes two high-voltage power distribution systems, a second high-voltage inverter system, a second high-voltage inverter switching cabinet system, and a second inverter master-slave switching cabinet, and the composition of its components and the connection structure between the components are the same as the first inverter system structure.

[0013] Furthermore, the device for seamless switching of the high-voltage frequency converter system further comprises a high-voltage cable tangent cabinet, which comprises a first power cable, a second power cable, a third power cable, and a fourth power cable;

[0014] The first power cable is connected to the first high-voltage inverter switching cabinet, and the first high-voltage inverter switching cabinet is respectively connected to the first high-voltage inverter and the spare high-voltage inverter in the first high-voltage inverter; the second power cable is connected to the second high-voltage inverter switching cabinet; the third power cable is connected to the second high-voltage inverter system; the fourth power cable is connected to the spare high-voltage inverter in the second high-voltage inverter system.

[0015] In order to achieve the above-mentioned purpose, the present invention provides a switching method for a seamless switching device of a high-voltage frequency conversion system, including that when a main frequency converter in a high-voltage frequency converter connected to a high-voltage motor fails, a standby machine can be put into use through a corresponding high-voltage frequency converter switching cabinet to communicate with the high-voltage motor, and the standby machine switches the failed main machine.

[0016] Furthermore, a switching device is provided to switch the power supply of the main frequency converter and the standby machine.

[0017] Furthermore, the high-voltage motor and the standby machine are connected to the high-voltage motor via a high-voltage cable switching cabinet.

[0018] This solution provides a device and method for seamless switching of the high-voltage inverter system of the main inclined shaft belt conveyor of a coal mine. It adds a high-voltage switch cabinet and a low-voltage switch cabinet to the original system, and also adds a new system. The new inverter system can be used as a backup for the old inverter system, and the new and old systems can be switched. The high-voltage inverter system of the main inclined shaft belt conveyor of the coal mine user can be replaced without stopping production, thereby ensuring the reliability of the drive of the main inclined shaft belt conveyor of the coal mine to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 This is the system structure diagram of the seamless switching device of the high-voltage inverter system;

[0021] Figure 2 This is a schematic diagram of the power cable distribution in the seamless switching system of this high-voltage inverter system.

[0022] The following is a description of the components in the accompanying drawings:

[0023] 1. First high-voltage power distribution system 1a. First high-voltage cabinet 1b. First high-voltage incoming line cabinet 1c. First contact cabinet 1d. First inverter front-stage cabinet 1e. Second inverter front-stage cabinet 1f. Third inverter front-stage cabinet 1g. Second high-voltage incoming line cabinet 1h. Second high-voltage cabinet 2. First high-voltage inverter system 2a. First high-voltage inverter 2b. Second high-voltage inverter 2c. Third high-voltage inverter 3. First high-voltage inverter switch cabinet system 3a. First high-voltage inverter switch cabinet 3b Second high-voltage inverter switch cabinet 4. High-voltage Cable tangent cabinet 4a. First high-voltage cable switching cabinet 4b. Second high-voltage cable switching cabinet 5. High-voltage motor 5a. First high-voltage motor 5b. Second high-voltage motor 6. Main control system 6a. First controller power module 6b. First controller CPU module 6c. First digital input module 6d. Digital output module 6e. Analog input module 7. First inverter master-slave switching cabinet 7a. Second controller power module 7b. Second controller CPU module 7c. First bus expansion module 7d. Second digital input module 7e. Second digital output module 8. Second inverter master-slave switching cabinet 8a. Third controller power module 8b. Third controller CPU module 8c. Second bus expansion module 8d. Third digital input module 8e. Third digital output module 8f. Intermediate relay 8g. First bus repeater 8h. Second bus repeater 8i. Third bus repeater 9. Communication bus 10. High-voltage power cable 11. Second high-voltage power distribution system 11a. First incoming line cabinet 11b. Second link Network cabinet 11c. Fourth inverter front cabinet 11d. Fifth inverter front cabinet 11e. Sixth inverter front cabinet 11f. Second incoming line cabinet 12. Second high-voltage inverter system 12a. Fourth high-voltage inverter 12b. Fifth high-voltage inverter 12c. Sixth high-voltage inverter 13. Second high-voltage inverter switch cabinet system 13a. Fourth high-voltage inverter switch cabinet 13b. Fifth high-voltage inverter switch cabinet 14. First power cable 15. Second power cable 16. Third power cable 17. Fourth power cable DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0025] In view of the technical problem that the existing high-voltage frequency converter of the main inclined shaft of a coal mine has low reliability, based on this technical problem, the present invention provides a device for seamless switching of the high-voltage frequency converter system of the belt conveyor of the main inclined shaft of a coal mine, which can realize the replacement of the high-voltage frequency converter system of the main inclined shaft belt conveyor of the coal mine user without stopping production, thereby ensuring the reliability of the drive of the main inclined shaft belt conveyor of the coal mine to the greatest extent.

[0026] The solution provides a seamless switching device for the high-voltage inverter system of the coal mine main inclined shaft belt conveyor. A high-voltage switch cabinet is added on each side of the high-voltage power distribution system based on the original system, and the hardware and software of other equipment in the original system do not need to be changed. At the same time, a new system high-voltage power distribution system, inverter, switching cabinet, etc. are added. The new inverter system can be used as a backup for the old inverter system, and the new and old systems can be switched freely, and the main control program and external equipment wiring do not need to be changed.

[0027] Among them, see Figure 1 The original system includes a first high-voltage power distribution system 1, a first high-voltage inverter system 2, a first high-voltage inverter switching cabinet system 3, a high-voltage motor 5, a main control system 6 and a first inverter master-slave switching cabinet 7.

[0028] Among them, the first high-voltage power distribution system 1 includes a first high-voltage cabinet 1a, a first high-voltage incoming line cabinet 1b, a first connecting cabinet 1c, a first inverter pre-stage cabinet 1d, a second inverter pre-stage cabinet 1e, a third inverter pre-stage cabinet 1f, a second high-voltage incoming line cabinet 1g and a second high-voltage cabinet 1h.

[0029] The first high-voltage incoming line cabinet 1b and the second high-voltage incoming line cabinet 1g are connected through the first connecting cabinet 1c to form a dual power supply circuit, which serves as the main power distribution switch of the entire main inclined shaft belt conveyor to ensure the reliability of power supply.

[0030] The first inverter front-stage cabinet 1d, the second inverter front-stage cabinet 1e and the third inverter front-stage cabinet 1f are respectively connected to the first high-voltage inverter system 2 and can serve as front-stage power supply switches for components of the first high-voltage inverter system 2.

[0031] Among them, the third inverter front-stage cabinet 1f is a spare device for emergency use.

[0032] The first high-voltage cabinet 1a and the second high-voltage cabinet 1h are two cabinets added to the original high-voltage power distribution system in this solution and serve as a dual-circuit power supply source for the second high-voltage power distribution system 11.

[0033] Furthermore, the first high-voltage inverter system 2 is an electric energy device for providing power to the high-voltage motor, and has at least three high-voltage inverters, namely a first high-voltage inverter 2a, a second high-voltage inverter 2b and a third high-voltage inverter 2c.

[0034] The power interfaces of the first high-voltage inverter 2a, the second high-voltage inverter 2b and the third high-voltage inverter 2c are respectively connected to the first inverter front-stage cabinet 1d, the second inverter front-stage cabinet 1e and the third inverter front-stage cabinet 1f, and their power is switched on and off through the first inverter front-stage cabinet 1d, the second inverter front-stage cabinet 1e and the third inverter front-stage cabinet 1f.

[0035] At the same time, the third high-voltage inverter 1f corresponds to the third high-voltage inverter 2c in the first high-voltage power distribution system and is a backup device for emergency use.

[0036] The output ends of the first high-voltage frequency converter 2 a and the second high-voltage frequency converter 2 b are normally connected to the high-voltage motor 5 , and the power after frequency conversion is input into the high-voltage motor 5 .

[0037] The high-voltage motor 5 includes at least two high-voltage motors, namely a first high-voltage motor 5a and a second high-voltage motor 5b; wherein the input ends of the first high-voltage motor 5a and the second high-voltage motor 5b are connected to the first high-voltage inverter 2a and the second high-voltage inverter 2c respectively.

[0038] It should be noted here that the number of the first high-voltage inverter system 2 and the high-voltage motor 5 is not limited as above, wherein the number of high-voltage inverters is one more than the number of high-voltage motors, which can be determined according to actual conditions.

[0039] In order to prevent the first high-voltage inverter system 2 from failing during operation and thus causing unreliable system operation, a first high-voltage inverter switching cabinet system 3 is connected between the first high-voltage inverter system 2 and the high-voltage motor 5 .

[0040] The first high-voltage frequency converter switching cabinet system 3 is used to switch the power output line between the first high-voltage frequency converter system 2 and the high-voltage motor 5, and it includes at least a first high-voltage frequency converter switching cabinet 3a and a second high-voltage frequency converter switching cabinet 3b, whose working ends are respectively connected to the first high-voltage frequency converter 2a and the second high-voltage frequency converter 2b, and whose output ends are respectively connected to the first high-voltage motor 5a and the second high-voltage motor 5b.

[0041] When the first high-voltage inverter 2a in the first high-voltage inverter system 2 fails, the first high-voltage inverter switching cabinet 3a can be used to switch the output path of the third high-voltage inverter 2c to the first high-voltage motor 5a and the output is valid.

[0042] At the same time, when the second high-voltage inverter 2b fails, like the first high-voltage inverter 2a, the second high-voltage inverter switching cabinet can be switched 3b to connect the output path of the third high-voltage inverter 2c to the second high-voltage motor 5b and make the output effective.

[0043] It should be noted here that the number of the first high-voltage inverter switching cabinet systems 2 is not limited, and can be the same as the number of the high-voltage motors 5, and the specific number can be determined according to actual conditions.

[0044] The main control system 6 , the first inverter master-slave switching cabinet 7 and the first high-voltage inverter system 2 are sequentially driven and connected via a communication bus 9 .

[0045] The main control system 6 includes a first controller power module 6a, a first controller CPU module 6b, a first digital quantity input module 6c, a first digital quantity output module 6d and an analog quantity input module 6e.

[0046] The first controller power supply module 6a is connected to an external power supply and is used to supply power to the first controller of the main control system.

[0047] The first controller CPU module 6b has its own bus ProfiBus interface.

[0048] The first digital quantity input module 6c is used as an input acquisition module for signals of operation return, fault, etc. of external devices, such as tensioning devices and brakes. The main control system 6 makes judgments based on the input acquisition module signals.

[0049] The first digital output module 6d is used as an output to control the start and stop of external devices, such as tensioning devices and brakes.

[0050] The analog input and output module 6e collects analog signals from external devices such as tensioners, brakes, etc.

[0051] Furthermore, the first inverter master-slave switching cabinet 7 includes a second controller power module 7a, a second controller CPU module 7b, a first bus expansion module 7c, a second digital quantity input module 7d, and a second digital quantity output module 7e.

[0052] The second controller power supply module 7a is connected to an external power supply and is used to supply power to the second controller inside the first inverter master-slave control cabinet 7 .

[0053] The second controller CPU module 7b has its own bus ProfiBus interface, which is connected to the first controller CPU module 6b's own bus ProfiBus interface to achieve the interconnection between the first inverter master-slave switching 7 and the main control system 6.

[0054] The second digital input module 7d is used as a closing signal acquisition input of the first inverter front-stage cabinet 1d, the second inverter front-stage cabinet 1e, and the third inverter front-stage cabinet 1f in the first high-voltage power distribution system 1.

[0055] The second digital output module 7e serves as an output control corresponding to the "closing" signal of the indicator light of the first inverter front-stage cabinet 1d, the second inverter front-stage cabinet 1e, and the third inverter front-stage cabinet 1f.

[0056] The first bus expansion module 7c is provided with a bus ProfiBus interface which is connected to the ProfiBus interface on the first high-voltage inverter system 2, so as to realize the interconnection between the first inverter master-slave switching cabinet 7 and the first high-voltage inverter system 2, and drive the first inverter master-slave switching cabinet 7 through the main control system 6 to perform master-slave control on the first high-voltage inverter system 2.

[0057] Based on the above-mentioned original inverter system, this solution adds a new system to this system, which can be used as a backup for the old inverter system. The old and new systems can be switched between them, ensuring the reliability of the belt conveyor drive in the main inclined shaft of the coal mine to the greatest extent.

[0058] The new inverter system provided by this solution includes a second high-voltage power distribution system 11, a second high-voltage inverter system 12, a second high-voltage inverter switching cabinet system 13, a second inverter master-slave switching cabinet 8 and a high-voltage cable switching cabinet 4.

[0059] The power supply of the second high-voltage power distribution system 11 is respectively drawn from the first high-voltage cabinet 1a and the second high-voltage cabinet 1h in the first high-voltage power distribution system.

[0060] The second high-voltage power distribution system 11 includes a first incoming line cabinet 11a, a second connecting cabinet 11b, a fourth inverter front-stage cabinet 11c, a fifth inverter front-stage cabinet 11d, a sixth inverter front-stage cabinet 11e and a second incoming line cabinet 11f.

[0061] The first incoming line cabinet 11a and the second incoming line cabinet 11f are connected through the second connecting cabinet 11b to form a dual power supply line for the power supply circuit, which serves as the main power distribution switch for the entire main inclined shaft belt conveyor to ensure the reliability of power supply.

[0062] The fourth inverter front-stage cabinet 11c, the fifth inverter front-stage cabinet 11d, and the sixth inverter front-stage cabinet 11e are respectively connected to the second high-voltage inverter system 12, and can serve as front-stage power supply switches for components of the second high-voltage inverter system 12.

[0063] The sixth inverter front-stage cabinet 11e is a spare device for emergency use.

[0064] Furthermore, the second high-voltage inverter system 12 is an electric energy device for providing power to the high-voltage motor, and has at least three high-voltage inverters, namely a fourth high-voltage inverter 12a, a fifth high-voltage inverter 12b and a sixth high-voltage inverter 12c.

[0065] The power interfaces of the fourth high-voltage inverter 12a, the fifth high-voltage inverter 12b and the sixth high-voltage inverter 12c are respectively connected to the fourth inverter front-stage cabinet 11c, the fifth inverter front-stage cabinet 11d and the sixth inverter front-stage cabinet 11e, and their power is switched on and off through the fourth inverter front-stage cabinet 11c, the fifth inverter front-stage cabinet 11d and the sixth inverter front-stage cabinet 11e.

[0066] At the same time, the sixth high-voltage inverter 12c corresponds to the third high-voltage inverter 2c in the first high-voltage power distribution system 2 and is a backup device for emergency use.

[0067] The output ends of the fourth high-voltage inverter 12 a and the fifth high-voltage inverter 12 b are normally connected to the high-voltage motor 5 , and the power after frequency conversion is input into the high-voltage motor 5 .

[0068] In order to prevent the second high-voltage inverter system 12 from failing during operation and causing unreliable system operation, a second high-voltage inverter switching cabinet system 13 is connected between the second high-voltage inverter system 12 and the high-voltage motor.

[0069] The second high-voltage frequency converter switching cabinet system 13 is used to switch the power output line between the second high-voltage frequency converter system 12 and the high-voltage motor 5. It at least includes a fourth high-voltage frequency converter switching cabinet 13a and a fifth high-voltage frequency converter switching cabinet 13b, whose working ends are respectively connected to the fourth high-voltage frequency converter 13a and the fifth high-voltage frequency converter 13b, and whose output ends are respectively connected to the first high-voltage motor 5a and the second high-voltage motor 5b.

[0070] When the fourth high-voltage inverter 12a in the second high-voltage inverter system 12 fails, the fourth high-voltage inverter switch cabinet 13a can be used to connect the output path of the sixth high-voltage inverter 12c to the first high-voltage motor 5a and make the output effective.

[0071] At the same time, when the fifth high-voltage inverter 12b fails, like the fourth high-voltage inverter 12a, the fifth high-voltage inverter switching cabinet 13b can be used to connect the output path of the sixth high-voltage inverter 12c to the second high-voltage motor 5b and the output is valid.

[0072] It should be noted here that the number, model and parameters of the second high-voltage inverter system 12 and the second high-voltage inverter switching cabinet system 13 are the same as those of the first high-voltage inverter system 2 and the first high-voltage inverter switching cabinet system 3 .

[0073] The second inverter master-slave switching cabinet 8 includes a third control power supply module 8a, a third controller CPU module 8b, a second bus expansion module 8c, a third digital input module 8d, a third digital output module 8e, an intermediate relay 8f, a first bus repeater 8g, a second bus repeater 8h, and a third bus repeater 8i.

[0074] The third controller power supply module 8a is connected to an external power supply and is used to supply power to the second inverter master-slave control cabinet 8 .

[0075] The third controller CPU module 8 b has its own bus ProfiBus interface, which is connected to the first controller CPU module 6 b's own bus ProfiBus interface to achieve interconnection between the second master-slave switching cabinet 8 and the main control system 6 .

[0076] The second bus expansion module 8c is provided with a bus ProfiBus interface connected to the ProfiBus interface on the second high-voltage inverter system 12, so as to realize the interconnection between the second inverter master-slave control cabinet 8 and the second high-voltage inverter system 12, and drive the second inverter master-slave control cabinet 8 through the main control system 6 to perform master-slave control on the second high-voltage inverter system 12.

[0077] The input end of the first bus repeater 8g is connected to the main control system 6; the second bus repeater 8h and the third bus repeater 8i are connected to the output end of the first bus repeater 8g; the second bus repeater 8h and the third bus repeater 8i are respectively connected to the first inverter master-slave switching cabinet 7 and the second inverter master-slave switching cabinet 8; the intermediate relay 8f is controlled by the main control system 6 and drives the second bus repeater 8h and the third bus repeater 8i to control the power supply of the second bus repeater 8h or the third bus repeater 8i.

[0078] After the new system is arranged, the main control software and hardware do not need to be changed. The ProfiBus bus coming out of the main control system 6 only needs to be connected to the first bus repeater 8g first; the first bus repeater 8g outputs 2 ProfiBus buses, one of which is connected to the second bus repeater 8h, and the other is connected to the third bus repeater 8i.

[0079] The second bus repeater 8h outputs a ProfiBus bus to the first frequency converter master-slave control cabinet 7 ; the third bus repeater 8i outputs a ProfiBus bus to the second frequency converter master-slave control cabinet 8 .

[0080] The main control system 6 controls the intermediate relay 8f to control the closing of the power supply of the second bus repeater 8h or the third bus repeater 8i to realize the switching of the first high-voltage inverter system 7 and the second high-voltage inverter system 8, that is, to realize the switching of the inverter system and the new inverter system.

[0081] In order to avoid the switching between the old and new systems affecting the connection of the power cables, this solution adds a high-voltage cable tangent cabinet 4, which is arranged next to the first high-voltage inverter switching cabinet 7. The power cable 10 that originally connected the high-voltage motor 5 to the first high-voltage inverter switching cabinet 7 is replaced with the high-voltage motor 5 connected to the high-voltage cable tangent cabinet 4.

[0082] It should be noted here that both the first high-voltage inverter switching cabinet 7 and the high-voltage cable tangent cabinet 4 use a double-throw knife switch 9 to perform a switching function, and the model of the double-throw knife switch 9 is GN19-10CST.

[0083] The high-voltage cable tangent cabinet 4 includes five power cables, namely a first power cable 14, a second power cable 15, a third power cable 16, and a fourth power cable 17.

[0084] See also Figure 2 The high-voltage cable tangent cabinet 4 has a double-throw knife switch, and a new first power cable 14 is added at one end to connect to the first high-voltage inverter switching cabinet 7, and a new second power cable 15 is added at the other end to connect to the second high-voltage inverter switching cabinet 8.

[0085] Furthermore, the first high-voltage inverter switching cabinet 7 is connected to the first high-voltage inverter system 2 at one end and to the third high-voltage inverter 2c at the other end through a double-throw knife switch without modification.

[0086] Furthermore, the second high-voltage inverter switching cabinet 8 has a double-throw knife switch, a third power cable 16 added at one end to connect to the second high-voltage inverter system 12, and a fourth power cable 17 added at the other end to connect to the sixth high-voltage inverter 12c.

[0087] The newly added high-voltage cable tangent cabinet 4 does not require temporary wiring, and can realize the replacement of the high-voltage inverter system of the main inclined shaft belt conveyor of the coal mine user without stopping production.

[0088] The above-mentioned scheme constitutes a device for seamless switching of the high-voltage inverter system of the main inclined belt conveyor of a coal mine. By adding a repeater switching device to the new master-slave control cabinet controller, it can achieve the purpose of switching between the old and new master-slave control cabinets. The new and old systems can be switched for use, thereby ensuring the reliability of the drive of the main inclined belt conveyor of the coal mine to the greatest extent; at the same time, adding a cable tangent cabinet can realize the replacement of the high-voltage inverter system of the main inclined belt conveyor of the coal mine user without stopping production.

[0089] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-voltage frequency conversion system seamless switching device, characterized in that: It includes a main control system, a first frequency converter system, a second frequency converter system, a switching device and a high-voltage motor; the switching device is controlled by the main control system and is connected to the input ends of the first frequency converter system and the second frequency converter system, and the switching device is controlled by the main control system to switch the power supply of the first frequency converter system and the second frequency converter system on and off; The output ends of the first frequency converter system and the second frequency converter system are respectively connected to the high-voltage motor; The switching device includes an intermediate relay, a first bus repeater, a second bus repeater, and a third bus repeater; The input end of the first bus repeater is connected to the main control system, and the first bus repeater receives the bus of the main control system and separates it into two buses; The second bus repeater and the third bus repeater are respectively connected to the two buses at the output end of the first bus repeater; The second bus repeater and the third bus repeater are connected to the first frequency converter system and the second frequency converter system respectively; The intermediate relay is controlled by the main control system and drives the second bus repeater and the third bus repeater to control the closing of the second bus repeater or the third bus repeater; The first inverter system includes a first high-voltage power distribution system, a first high-voltage inverter system and a first inverter master-slave switching cabinet; the first high-voltage power distribution system is connected to the first high-voltage inverter system and the second inverter system respectively to provide power for them; the first inverter master-slave switching cabinet is controlled by the main control system and driven to connect to the first high-voltage inverter system; the first high-voltage inverter system is connected to the high-voltage motor; A first high-voltage inverter switching cabinet system is provided between the first high-voltage inverter system and the high-voltage motor; the first high-voltage inverter switching cabinet system includes at least two high-voltage frequency conversion switching cabinets and are respectively connected to the high-voltage inverters in the first high-voltage inverter system; when any high-voltage inverter fails, the corresponding high-voltage frequency conversion switching cabinet switches the standby high-voltage inverter to establish a circuit connection with the corresponding high-voltage motor.

2. A high-voltage frequency conversion system seamless switching device according to claim 1, characterized in that: The first high-voltage inverter system includes at least three high-voltage inverters; the high-voltage motors include at least two high-voltage motors; the number of high-voltage inverters is one more than the number of high-voltage motors; the plurality of high-voltage inverters are connected correspondingly to the plurality of high-voltage motors, and the extra high-voltage inverter is a backup inverter.

3. A high voltage frequency conversion system seamless switching device according to claim 1 or 2, characterized in that: The second inverter system includes two high-voltage power distribution systems, a second high-voltage inverter system, a second high-voltage inverter switching cabinet system, and a second inverter master-slave switching cabinet. The composition of its components and the connection structure between the components are the same as those of the first inverter system.

4. A high-voltage frequency conversion system seamless switching device according to claim 1, characterized in that: The device for seamless switching of the high-voltage frequency converter system also includes a high-voltage cable tangent cabinet, which includes a first power cable, a second power cable, a third power cable, and a fourth power cable; The first power cable is connected to the first high-voltage inverter switching cabinet, and the first high-voltage inverter switching cabinet is respectively connected to the first high-voltage inverter and the spare high-voltage inverter in the first high-voltage inverter; the second power cable is connected to the second high-voltage inverter switching cabinet; the third power cable is connected to the second high-voltage inverter system; the fourth power cable is connected to the spare high-voltage inverter in the second high-voltage inverter system.

5. A switching method for a seamless switching device of a high-voltage frequency conversion system, characterized in that: The switching method is based on a seamless switching device for a high-voltage frequency conversion system according to any one of claims 1 to 4, including that when a main frequency converter in a high-voltage frequency converter connected to a high-voltage motor fails, a standby machine can be put into operation through a corresponding high-voltage frequency converter switching cabinet to communicate with the high-voltage motor, and the standby machine switches the failed main machine.

6. The switching method of a seamless switching device of a high-voltage frequency conversion system according to claim 5, characterized in that: The power supply between the main inverter and the standby inverter is switched on by setting a switching device.

7. The switching method of a seamless switching device of a high-voltage frequency conversion system according to claim 5, characterized in that: The high-voltage motor and the standby machine are connected to the high-voltage motor through a high-voltage cable switching cabinet.

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