CN222234706U - High-voltage frequency conversion system for starting permanent magnet synchronous motor - Google Patents
High-voltage frequency conversion system for starting permanent magnet synchronous motor Download PDFInfo
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- CN222234706U CN222234706U CN202420853242.4U CN202420853242U CN222234706U CN 222234706 U CN222234706 U CN 222234706U CN 202420853242 U CN202420853242 U CN 202420853242U CN 222234706 U CN222234706 U CN 222234706U
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Abstract
The utility model discloses a high-voltage frequency conversion system for starting a permanent magnet synchronous motor, which comprises a high-voltage frequency converter, switching equipment, a plurality of 6kV power switch cabinets, the permanent magnet synchronous motors A-F and a unit DCS control system, wherein the high-voltage frequency converter and the switching equipment comprise a high-voltage frequency converter I, a high-voltage frequency converter II, a disconnecting switch QS21, a disconnecting switch QS22, a disconnecting switch QS23, vacuum contactors KM 11-KM 16 and disconnecting switches QS 11-QS 16, and starting and switching control commands of the high-voltage frequency converter and the switching equipment come from the unit DCS control system.
Description
Technical Field
The utility model belongs to the technical field of high-voltage frequency converter application, and relates to a high-voltage frequency conversion system for starting a permanent magnet synchronous motor.
Background
The traditional driving mode of the medium-speed coal mill in the thermal power plant generally adopts the mode of an asynchronous motor, a coupler and a vertical shaft bevel gear box (speed reducer), the motor is horizontally arranged, the coal mill is vertically arranged, the vertical shaft bevel gear box realizes torque transmission and driving direction change, chain driving is long and efficiency is low, the rated capacity of the asynchronous motor is selected according to rated working conditions, the nameplate power of the asynchronous motor is relatively large, and the running efficiency and the power factor of the asynchronous motor are obviously reduced when the coal mill runs under low load rate.
The permanent magnet synchronous motor rotor is a permanent magnet, no rotor winding coil exists, no rotor current exists in steady-state operation, so that the permanent magnet synchronous motor has higher efficiency in the range of 25% -120% rated load, meanwhile, the stator winding of the permanent magnet synchronous motor has resistive load characteristics, the power factor of the motor is close to 1, the higher power factor can be kept in the range of 20% -120% load, and the energy-saving effect is remarkable in light operation.
Although the permanent magnet synchronous motor has the characteristics of high power factor and high operation efficiency, the permanent magnet synchronous motor cannot be started directly like an asynchronous motor, most permanent magnet synchronous motors need to be started in a variable frequency mode, the frequency of a power supply input into the motor is changed through a frequency converter, so that the rotating speed of a stator rotating magnetic field is changed, the frequency of an output power supply of the frequency converter is gradually increased, the rotating speed of the motor is increased along with the rotating speed of the frequency converter, and the permanent magnet synchronous motor is brought into the synchronous rotating speed to finish the starting.
According to the different unit capacities, the number of medium speed coal mills configured by each unit of the thermal power plant is also different, a 600 MW-level unit is generally configured with 6 medium speed coal mills, and each coal mill is configured with 1 permanent magnet synchronous motor. The high-voltage frequency converter is arranged for meeting the starting requirement of the permanent magnet synchronous motor, if each permanent magnet synchronous motor is provided with 1 set of high-voltage frequency converter, the wiring is simple and clear, but the high-voltage frequency converter is only used for starting, when the motor normally operates, the high-voltage frequency converter is out of operation, the scheme is poor in economical efficiency, and the number and wiring types of the high-voltage frequency converters are determined by comprehensively considering the reliability, rationality and economical efficiency of a starting system of the permanent magnet synchronous motor.
Disclosure of utility model
The utility model aims at the application scene that 6 medium-speed coal mills are arranged on a unit of a thermal power plant, and each medium-speed coal mill adopts 1 permanent magnet synchronous motor for driving.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The high-voltage frequency converter and the switching device comprise a high-voltage frequency converter I, a high-voltage frequency converter II, a disconnecting switch QS21, a disconnecting switch QS22, a disconnecting switch QS23, vacuum contactors KM 11-KM 16 and disconnecting switches QS 11-QS 16, wherein the high-voltage frequency converter I and the high-voltage frequency converter II of the high-voltage frequency converter and the switching device are respectively connected with one 6kV power switch cabinet;
The output end of the vacuum contactor KM13 is connected with the input end of the isolating switch QS11, the output end of the isolating switch QS11 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor A through a cable, the output end of the vacuum contactor KM12 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor B through a cable, the output end of the isolating switch QS12 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor B through a cable, the output end of the vacuum contactor KM13 is connected to the input end of the isolating switch QS13, and the output end of the isolating switch QS13 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor C through a cable;
The 6kV power switch cabinet connected with the high-voltage frequency converter II is connected to the power input end of the high-voltage frequency converter II, the output end of the high-voltage frequency converter II is connected to the input end of the isolating switch QS22, the output end of the QS22 is connected to the input ends of the vacuum contactor KM14, the vacuum contactor KM15, the vacuum contactor KM16 and the output end of the isolating switch QS23, the output end of the vacuum contactor KM14 is connected with the input end of the isolating switch QS14, and the output end of the isolating switch QS14 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor D through a cable; the output end of the vacuum contactor KM15 is connected with the input end of the isolating switch QS15, and the output end of the isolating switch QS15 is connected to a 6kV power switch cabinet connected with the permanent magnet synchronous motor E through a cable;
The permanent magnet synchronous motors A-F are respectively connected with a 6kV power switch cabinet through cables;
The set DCS control system sends a start-stop command and a switching command to the high-voltage frequency converter and the switching equipment through hard wiring, and meanwhile, equipment operation and fault feedback information is sent to the set DCS control system.
Further, 6kV vacuum circuit breakers are respectively arranged in the cabinets of the 6kV power switch cabinets, and the 6kV power switch cabinets respectively provide power for the high-voltage frequency converter I, the high-voltage frequency converter II and the permanent magnet synchronous motors A-F.
Further, the permanent magnet synchronous motors A-F correspond to 1 medium-speed coal mill respectively.
Further, the unit DCS control system can manually control the start and stop of each permanent magnet synchronous motor and monitor the running state of equipment through an operator station of the control system, the unit DCS control system sends start, exit and start switching commands to the high-voltage frequency converter I and the high-voltage frequency converter II, closing and opening commands are sent to the vacuum contactors KM 11-KM 16, the 6kV vacuum circuit breaker QF21 and the 6kV vacuum circuit breaker QF22, and meanwhile, equipment running and fault feedback information is sent to the unit DCS control system.
The utility model has the following beneficial effects:
1.1 sets of high-voltage frequency converter and switching equipment can realize the aim of starting 6 permanent magnet synchronous motors in sequence, so that the initial investment cost of equipment is saved;
2. The high-voltage frequency converter I and the high-voltage frequency converter II are mutually standby, one frequency converter fails, the normal starting of the permanent magnet synchronous motor is not affected, and the reliability of a starting system is high;
3. The switching logic of the permanent magnet synchronous motor starting system is clear and easy to realize.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model;
FIG. 2 is a wiring diagram of the present utility model.
Detailed Description
The novel implementation of the present embodiment will now be described in detail and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all examples of the present utility model. Other embodiments, based on specific embodiments of the utility model, which are obtained by a person of ordinary skill in the art without making any inventive modifications, are within the scope of the protection of the present utility model.
The number of 6kV power switch cabinets is 8, and 6kV power switch cabinets 11, 12, 13, 14, 15, 16, 21 and 22 are used respectively, so that 6 feeder lines are mainly considered, and different types of feeder lines can be easily identified from the number 11 to the number 16.
Referring to fig. 1 and 2, a high-voltage frequency converter I, a high-voltage frequency converter II, a high-voltage frequency converter 23, a high-voltage frequency converter 16, a high-voltage frequency converter 15, a high-voltage frequency converter 16, a vacuum contactor KM14, a vacuum contactor KM15 and a vacuum contactor KM16 jointly form a high-voltage frequency conversion and switching cabinet II, and the high-voltage frequency conversion and switching cabinet I and the high-voltage frequency conversion and switching cabinet II jointly form the high-voltage frequency converter and switching equipment.
The high-voltage frequency converter I and the high-voltage frequency converter II are core equipment of the utility model, and are required to have the characteristics of vector control function, high starting torque, good low-frequency torque characteristic, high frequency control precision and the like, for example, BP series frequency converters of Jingji science and technology limited company can be selected to meet the starting requirement of a permanent magnet synchronous motor.
6KV power switch cabinets 21 and 22, wherein a 6kV vacuum breaker QF21 and a vacuum breaker QF22 are arranged in the cabinet to provide power for the high-voltage frequency converter and the switching equipment, the 6kV power switch cabinet 21 provides power for the high-voltage frequency converter I, and the 6kV power switch cabinet 22 provides power for the high-voltage frequency converter II.
6KV power switch cabinets 11-16, wherein 6kV vacuum circuit breakers QF 11-QF 16 are arranged in the cabinet, and provide normal operation power for the permanent magnet synchronous motor, the 6kV power switch cabinet 11 provides power for the permanent magnet synchronous motor A, the 6kV power switch cabinet 12 provides power for the permanent magnet synchronous motor B, the 6kV power switch cabinet 13 provides power for the permanent magnet synchronous motor C, the 6kV power switch cabinet 14 provides power for the permanent magnet synchronous motor D, the 6kV power switch cabinet 15 provides power for the permanent magnet synchronous motor E, and the 6kV power switch cabinet 16 provides power for the permanent magnet synchronous motor F.
The 6kV power switch cabinet 21 provides power for the high-voltage frequency converter I, is connected to the power input end of the high-voltage frequency converter I, the output end of the high-voltage frequency converter I is connected to the input end of the isolating switch QS21, the output end of the isolating switch QS21 is connected to the input ends of the vacuum contactor KM11, the vacuum contactor KM12, the vacuum contactor KM13 and the isolating switch QS23, the output end of the vacuum contactor KM11 is connected with the input end of the isolating switch QS11 through a cable, the output end of the isolating switch QS11 is connected with the input end of the isolating switch QS12 through a cable, the output end of the isolating switch QS12 is connected with the 6kV power switch cabinet 12 through a cable, the output end of the vacuum contactor KM13 is connected with the input end of the isolating switch QS13 through a cable, the output end of the isolating switch QS23 is connected with the output end of the isolating switch QS22 of the high-voltage frequency conversion and switching cabinet II through a copper bar.
The 6kV power switch cabinet 22 provides power for the high-voltage frequency converter II, is connected to the power input end of the high-voltage frequency converter II, the output end of the high-voltage frequency converter II is connected to the input end of the isolating switch QS22, the output end of the QS22 is connected to the vacuum contactor KM14, the vacuum contactor KM15, the input end of the vacuum contactor KM16 and the output end of the isolating switch QS23, the output end of the vacuum contactor KM14 is connected with the input end of the isolating switch QS14 through a cable, the output end of the vacuum contactor KM15 is connected with the input end of the isolating switch QS15 through a cable, the output end of the isolating switch QS15 is connected with the 6kV power switch cabinet 15, and the output end of the vacuum contactor KM16 is connected with the input end of the isolating switch QS16 through a cable, and the output end of the isolating switch QS16 is connected with the 6kV power switch cabinet 16.
The 6kV power switch cabinet 11 is connected to the permanent magnet synchronous motor A through a cable;
the 6kV power switch cabinet 12 is connected to the permanent magnet synchronous motor B through a cable;
the 6kV power switch cabinet 13 is connected to the permanent magnet synchronous motor C through a cable;
the 6kV power switch cabinet 14 is connected to the permanent magnet synchronous motor D through a cable;
The 6kV power switch cabinet 15 is connected to the permanent magnet synchronous motor E through a cable;
The 6kV power switch cabinet 16 is connected to the permanent magnet synchronous motor F through a cable.
The set DCS control system sends a start-stop command and a switching command to the high-voltage frequency converter and the switching equipment through hard wiring, and meanwhile, equipment operation and fault feedback information is sent to the set DCS control system.
The permanent magnet synchronous motor starts and switches the operation sequence.
By adopting the configuration scheme of the utility model, the permanent magnet synchronous motors A-F can be started in sequence according to the operation requirement. The isolating switches QS21, QS22, QS23 and QS 11-QS 16 are local manual operation equipment, and the operating principle is that when the high-voltage frequency converter I and the high-voltage frequency converter II are available, the isolating switches QS21 and QS22 are closed, the isolating switch QS23 is opened, when the high-voltage frequency converter I is available, the isolating switches QS21 and QS23 are closed, the isolating switches QS22 are opened, when the high-voltage frequency converter II is unavailable, the isolating switches QS22 and QS23 are closed, the isolating switches QS21 are opened, and when the permanent magnet synchronous motors A-F are required to be started, the isolating switches QS 11-QS 16 are closed, and when a certain synchronous motor fails or overhauls, the corresponding isolating switches are in an open state.
Taking a permanent magnet synchronous motor A as an illustration of a starting and switching operation sequence, and other motors are similar in starting and switching operation sequence, when a high-voltage frequency converter I is available, firstly, a 6kV vacuum breaker QF21 is closed, a vacuum contactor KM11 is closed, the high-voltage frequency converter I is started, the output power frequency of the high-voltage frequency converter I is set to be 0.1Hz, the permanent magnet synchronous motor A is driven to rotate, the frequency of the output power is gradually increased, the rotor of the permanent magnet synchronous motor A is dragged to increase the rotating speed until the rated rotating speed is reached, a set DCS control system sends a starting switching command to the high-voltage frequency converter I, the high-voltage frequency converter I sends a signal for closing the breaker QF11 and opening the vacuum contactor KM11 after receiving the switching command, the permanent magnet synchronous motor A is switched to a power frequency operation mode, the vacuum contactor KM11 is opened, the high-voltage frequency converter I is exited, the vacuum breaker QF21 is opened, and the starting of the permanent magnet synchronous motor A is completed and the power frequency operation is switched to the power frequency operation. If the high-voltage frequency converter I is unavailable and the high-voltage frequency converter II is available, the high-voltage frequency converter II can be utilized to start the permanent magnet synchronous motor A, firstly, the 6kV breaker QF22 is closed, the vacuum contactor KM11 is closed, the high-voltage frequency converter II is started, the output power frequency of the high-voltage frequency converter II is set to be 0.1Hz, the permanent magnet synchronous motor A is driven to rotate, the frequency of the output power is gradually increased, the rotor of the permanent magnet synchronous motor A is dragged to increase the rotating speed until the rated rotating speed is reached, the set DCS control system sends out a starting switching command to the high-voltage frequency converter II, the high-voltage frequency converter II sends out a signal for closing the breaker QF11 and opening the vacuum contactor KM11 after receiving the switching command, the permanent magnet synchronous motor A is switched to a power frequency operation mode, the vacuum contactor KM11 is opened, the high-voltage frequency converter II is exited, the vacuum breaker QF22 is opened, and the starting of the permanent magnet synchronous motor A is completed and the power frequency operation is switched to power frequency operation. Therefore, the purpose of starting any permanent magnet synchronous motor by any high-voltage frequency converter is realized, the single frequency converter fails, the starting of the permanent magnet synchronous motor is not affected, the reliability of a frequency conversion starting system is improved, 6 permanent magnet synchronous motors are arranged, 1 set of high-voltage frequency converter and switching equipment are configured, the starting requirement of 6 permanent magnet synchronous motors is met, and compared with the configuration of 6 sets of frequency converters, the method reduces the initial investment cost of engineering and has good economical efficiency, so that the configuration scheme of starting 6 permanent magnet synchronous motors by using a 'two-to-six' high-voltage frequency conversion system is excellent in reliability, safety and economical efficiency, and can be widely popularized and applied in similar engineering.
Claims (4)
1. The high-voltage frequency conversion system for starting the permanent magnet synchronous motor is characterized by comprising a high-voltage frequency converter, switching equipment, a plurality of 6kV power switch cabinets, permanent magnet synchronous motors A-F and a set DCS control system, wherein the high-voltage frequency converter and the switching equipment comprise a high-voltage frequency converter I, a high-voltage frequency converter II, a disconnecting switch QS21, a disconnecting switch QS22, a disconnecting switch QS23, vacuum contactors KM 11-KM 16 and disconnecting switches QS 11-QS 16, the high-voltage frequency converter I and the high-voltage frequency converter II of the high-voltage frequency converter and the switching equipment are respectively connected with one 6kV power switch cabinet, starting and switching control commands of the high-voltage frequency converter and the switching equipment are from the set DCS control system, and the permanent magnet synchronous motors A-F are respectively connected with one 6kV power switch cabinet;
The output end of the vacuum contactor KM13 is connected with the input end of the isolating switch QS11, the output end of the isolating switch QS11 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor A through a cable, the output end of the vacuum contactor KM12 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor B through a cable, the output end of the isolating switch QS12 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor B through a cable, the output end of the vacuum contactor KM13 is connected to the input end of the isolating switch QS13, and the output end of the isolating switch QS13 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor C through a cable;
The 6kV power switch cabinet connected with the high-voltage frequency converter II is connected to the power input end of the high-voltage frequency converter II, the output end of the high-voltage frequency converter II is connected to the input end of the isolating switch QS22, the output end of the QS22 is connected to the input ends of the vacuum contactor KM14, the vacuum contactor KM15, the vacuum contactor KM16 and the output end of the isolating switch QS23, the output end of the vacuum contactor KM14 is connected with the input end of the isolating switch QS14, and the output end of the isolating switch QS14 is connected to the 6kV power switch cabinet connected with the permanent magnet synchronous motor D through a cable; the output end of the vacuum contactor KM15 is connected with the input end of the isolating switch QS15, and the output end of the isolating switch QS15 is connected to a 6kV power switch cabinet connected with the permanent magnet synchronous motor E through a cable;
The permanent magnet synchronous motors A-F are respectively connected with a 6kV power switch cabinet through cables;
the unit DCS control system is connected with the high-voltage frequency converter and the switching equipment through hard wires.
2. The high-voltage frequency conversion system for starting the permanent magnet synchronous motor according to claim 1, wherein 6kV vacuum circuit breakers are respectively arranged in the 6kV power switch cabinets, and the 6kV power switch cabinets respectively provide power for the high-voltage frequency converter I, the high-voltage frequency converter II and the permanent magnet synchronous motors A-F.
3. The high-voltage variable frequency system for starting the permanent magnet synchronous motor according to claim 1, wherein the permanent magnet synchronous motors A-F correspond to 1 medium-speed coal mill respectively.
4. The high-voltage frequency conversion system for starting the permanent magnet synchronous motors according to claim 1, wherein an operator can manually control the starting and stopping of each permanent magnet synchronous motor and monitor the running state of equipment through an operator station of the control system, the set DCS control system sends starting, exiting and starting switching commands to the high-voltage frequency converter I and the high-voltage frequency converter II, and closing and opening commands are sent to vacuum contactors KM 11-KM 16, a 6kV vacuum circuit breaker QF21 and a 6kV vacuum circuit breaker QF22, and meanwhile equipment running and fault feedback information is sent to the set DCS control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420853242.4U CN222234706U (en) | 2024-04-23 | 2024-04-23 | High-voltage frequency conversion system for starting permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420853242.4U CN222234706U (en) | 2024-04-23 | 2024-04-23 | High-voltage frequency conversion system for starting permanent magnet synchronous motor |
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| Publication Number | Publication Date |
|---|---|
| CN222234706U true CN222234706U (en) | 2024-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420853242.4U Active CN222234706U (en) | 2024-04-23 | 2024-04-23 | High-voltage frequency conversion system for starting permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222234706U (en) |
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- 2024-04-23 CN CN202420853242.4U patent/CN222234706U/en active Active
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