CN101355340B - Control method for automatically switching standby power of synchronous motor - Google Patents
Control method for automatically switching standby power of synchronous motor Download PDFInfo
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- CN101355340B CN101355340B CN2007100441860A CN200710044186A CN101355340B CN 101355340 B CN101355340 B CN 101355340B CN 2007100441860 A CN2007100441860 A CN 2007100441860A CN 200710044186 A CN200710044186 A CN 200710044186A CN 101355340 B CN101355340 B CN 101355340B
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Abstract
The invention discloses a method for automatically switching and controlling a spare power supply for a synchronous motor. When a main power supply has low voltage or current failure, the operating synchronous motor trips instantaneously, the rotating speed is reduced at once, at the moment that the synchronous motor trips, a protection control system closes an LCI transducer and a circuit breaker connected with the synchronous motor, a thyristor of the LCI transducer triggers a pulse trigger, the speed of the synchronous motor which is in the state of reducing the rotating speed due to breakdown is increased again to the synchronous rated rotating speed; after the rotating speed is up to the synchronous rated rotating speed, if the power supply with failure is normal, the circuit breaker of the synchronous motor and the power supply is closed through an automatic synchronizer after the corresponding process is performed, the circuit breaker of the LCI transducer connected with the synchronous motor is disconnected, and the synchronous motor operates normally. The control method increases the speed of the synchronous motor which is in the state of reducing the rotating speed due to breakdown to the synchronous rated rotating speed, and prevents the synchronous motor from stopping running.
Description
Technical field
The present invention relates to electric drive technology, relate in particular to the control method that standby power of synchronous motor automaticallyes switch.
Background technology
Dragged by synchronous motor for some important productions load, when synchronous motor during because of mains supply power supply dead electricity or low-voltage, the protection control system can be protected tripping operation, and synchronous motor will be stopped running, and will cause very big loss to production.
The technology of existing synchronous motor power supply control method for automatically switching has the synchronous switching control or the automatic switching device of standby power supply (being called for short " BZT ") of alternating current motor inverter supply and mains supply.Chinese patent CN02139514.4 discloses a kind of " the synchronous switching control of alternating current motor inverter supply and mains supply ", this device mainly is from how the alternating current motor that moves being switched between by inverter supply and mains supply, but to some jumbo synchronous motors, owing to when the power supply dead electricity causes motor speed to descend, be not have the handoff technique function.Automatic switching device of standby power supply mainly is to solve when one road power supply dead electricity, by the logical condition of autotomying, drops into another road stand-by power supply automatically, guarantees to power not interrupt.But this technology can not solve the electric drive function to the synchronous motor pull-in step speed again that causes rotating speed decline owing to the power supply dead electricity.
For the very high production load of continuous service requirement, as synchronous motor-driven blast furnace air, when synchronous motor shuts down, to cause the blast furnace air feed to interrupt, cause blast furnace filling slag, production causes very big loss, the life-span of also reducing blast furnace to blast furnace, above-mentioned two kinds of prior aries can not satisfy its requirement, thereby because the power supply dead electricity is brought massive losses.
Summary of the invention
The object of the present invention is to provide a kind of control method for automatically switching standby power of synchronous motor, this control method for automatically switching is when power supply generation low-voltage or outage, adopt the LCI inverter supply from incision technology, the LCI frequency converter is that thyristor load nature commutation current mode ac-dc-ac frequency converter is (hereinafter to be referred as the LCI frequency converter, wherein the English of LCI is: Load commutatedinverter), with synchronous motor because of dead electricity be in rotating speed decline state again raising speed to synchronous rated speed, thereby avoid causing synchronous motor to shut down because of power failure or low-voltage.
For achieving the above object, the present invention is achieved in that
A kind of control method for automatically switching standby power of synchronous motor, it is characterized in that: the automatic switchover system of standby power of synchronous motor comprises duplex feeding power supply, LCI frequency converter, synchronous device, excitation unit, protection control system, several circuit breakers, the LCI frequency converter is provided with circuit breaker respectively at mains side, can connect with the two-way power supply respectively by circuit breaker, also connect by circuit breaker and synchronous motor in the synchronous motor side;
Synchronous motor is when normal operation, and directly from the main power source power taking, LCI frequency converter and stand-by power supply are connect by circuit breaker;
When main power source generation low-voltage or outage, synchronous motor moment of operation will trip, rotating speed descends at once, in the moment of synchronous motor protection tripping operation, the protection control system is closed the circuit breaker of LCI frequency converter and the connection of this synchronous motor, LCI frequency converter thyristor trigger pulse triggers will be in the rotating speed decline state synchronization motor extremely synchronous rated speed of raising speed again because of dead electricity at once;
After synchronous rated speed, if eliminating, the power failure that breaks down recovers normal, then find with the close circuit breaker of synchronous motor and power supply of after date by synchronous device, disconnect the circuit breaker that LCI frequency converter and synchronous motor connect simultaneously, synchronous motor recovers normal operation.
The present invention is owing to adopted above-mentioned technical scheme, make it compared with prior art, solved that synchronous motor trips because of power failure or because of dead electricity be in rotating speed decline state synchronization motor again raising speed avoided the influence that the high production load of continuous service requirement is caused to the difficult problem of rated speed synchronously.
Description of drawings
Fig. 1 is the principle schematic of control method for automatically switching standby power of synchronous motor of the present invention.
Among the figure: 1 first power supply (main power source), 2 second sources (stand-by power supply), 3 first circuit breakers; 4 second circuit breakers; 5 the 3rd circuit breakers, 6 the 4th circuit breakers, 7 the 5th circuit breakers; 8 the 6th circuit breakers; the 9LCI frequency converter, 10 synchronous devices, 11 protection control system; 12 synchronous motors, 13 excitation units.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, the automatic switchover system of standby power of synchronous motor comprises duplex feeding power supply, LCI frequency converter 9, synchronous device 10, excitation unit 13, protection control system 11, several circuit breakers.The duplex feeding power supply i.e. first power supply 1 and second source 2, LCI frequency converter 9 is provided with the 3rd circuit breaker 5 and the 4th circuit breaker 6 respectively at mains side, can connect with first power supply 1 and second source 2 respectively by circuit breaker 5,6, also connect by the 6th circuit breaker 8 and synchronous motor 12 in the synchronous motor side.The effect of synchronous device 10 is frequency and the initial phases by control LCI frequency converter 9 trigger impulses, make frequency, initial phase, the amplitude of LCI frequency converter 9 output voltages and supply voltage frequency, initial phase, the amplitude that will be incorporated into the power networks consistent.Excitation unit 13 starts field power supply and running field power supply for motor provides.Protection control system 11 realizes above-mentioned control procedure and realizes defencive function by the PLC programming.
The course of work of control method for automatically switching standby power of synchronous motor is:
During synchronous motor 12 normal operations, the 3rd circuit breaker 5, the 6th circuit breaker 8 are in the gate-dividing state position, first circuit breaker 3, the 5th circuit breaker 7 are in the closure state position, and synchronous motor 12 is not by LCI frequency converter 9 and directly by first power supply, 1 powered operation; The 4th circuit breaker 6 and second circuit breaker 4 also are in closure state, and LCI frequency converter 9 is connect by circuit breaker 6,4 with second source 2.
When low-voltage or outage take place in first power supply 1, the moment of the synchronous motor 12 protection tripping operations of operation, rotating speed descends at once, simultaneously, in the moment of synchronous motor 12 protection tripping operations, protection control system 11 is closed LCI frequency converter 9 and the 6th circuit breaker 8 that this synchronous motor 12 connects, and LCI frequency converter 9 thyristor trigger pulse triggers will be in the rotating speed decline state synchronization motor 12 extremely synchronous rated speed of raising speed again because of dead electricity at once; And the device 13 that puts into excitation.
After reaching rated speed and being in synchronous operation, if eliminating, first power supply, 1 fault that breaks down recovers normal, then find with close the 5th circuit breaker 7 of 1 of synchronous motor 12 and first power supply of after date by synchronous device 10, disconnect the 6th circuit breaker 8 that LCI frequency converter 9 and synchronous motor 12 connect simultaneously, synchronous motor 12 recovers normal operation.
When LCI frequency converter 9 need in service looked for the same period with the recovery normal operating mode by synchronous device 10, it is consistent with frequency, initial phase, the amplitude of first power supply, 1 voltage that then the output voltage frequency of LCI frequency converter 9, initial phase, amplitude should be passed through synchronous device 10 adjustment backs.
Control method for automatically switching standby power of synchronous motor of the present invention compared with prior art, the synchronous motor that has solved that synchronous motor trips because of power failure or be in rotating speed decline state because of dead electricity again raising speed has been avoided the impact that the high production load of continuous service requirement is caused to the synchronous difficult problem of rated speed.
Claims (1)
1. control method for automatically switching standby power of synchronous motor, it is characterized in that: the automatic switchover system of standby power of synchronous motor comprises duplex feeding power supply, LCI frequency converter, synchronous device, excitation unit, protection control system and several circuit breakers, the LCI frequency converter is provided with circuit breaker respectively at mains side, can connect with the two-way power supply respectively by circuit breaker, also connect by circuit breaker and synchronous motor in the synchronous motor side;
Synchronous motor is when normal operation, and directly from the main power source power taking, LCI frequency converter and stand-by power supply are connect by circuit breaker;
When main power source generation low-voltage or outage, synchronous motor moment of operation will trip, rotating speed descends at once, in the moment of synchronous motor protection tripping operation, the protection control system is closed the circuit breaker of LCI frequency converter and the connection of this synchronous motor, LCI frequency converter thyristor trigger pulse triggers will be in the rotating speed decline state synchronization motor extremely synchronous rated speed of raising speed again because of dead electricity at once;
After synchronous rated speed, if eliminating, the mains power failure that breaks down recovers normal, then the LCI frequency converter by synchronous device find with main power source with the close circuit breaker of synchronous motor and main power source of after date, disconnect the circuit breaker that LCI frequency converter and synchronous motor connect simultaneously, synchronous motor recovers normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100441860A CN101355340B (en) | 2007-07-25 | 2007-07-25 | Control method for automatically switching standby power of synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100441860A CN101355340B (en) | 2007-07-25 | 2007-07-25 | Control method for automatically switching standby power of synchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101355340A CN101355340A (en) | 2009-01-28 |
| CN101355340B true CN101355340B (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100441860A Expired - Fee Related CN101355340B (en) | 2007-07-25 | 2007-07-25 | Control method for automatically switching standby power of synchronous motor |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368149B (en) * | 2012-04-09 | 2016-03-09 | 无锡华润上华科技有限公司 | Low-voltage distribution system fault monitoring method |
| CN102857153B (en) * | 2012-08-31 | 2015-12-09 | 北京山崎电气设备有限公司 | A kind of energy-conservation steady control device |
| CN104601049B (en) * | 2014-12-31 | 2017-10-13 | 鞍钢集团信息产业有限公司 | A kind of main power source method of reseptance of synchronous motor |
| CN107269508B (en) * | 2017-08-02 | 2020-02-04 | 华润电力（海丰）有限公司 | Power supply system of industrial water pump of thermal power factory |
| CN113364034B (en) * | 2021-06-11 | 2022-08-19 | 重庆普什新能源技术有限公司 | Automatic control method and device for gas generator set |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4315162A (en) * | 1980-05-09 | 1982-02-09 | Control Technology, Incorporated | Reserve power supply for computers |
| US5896948A (en) * | 1994-11-29 | 1999-04-27 | Kone Oy | Reserve power system |
| CN2321105Y (en) * | 1997-12-30 | 1999-05-26 | 潘前鸿 | Automatic transfer device for AC power supply circuit |
-
2007
- 2007-07-25 CN CN2007100441860A patent/CN101355340B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4315162A (en) * | 1980-05-09 | 1982-02-09 | Control Technology, Incorporated | Reserve power supply for computers |
| US5896948A (en) * | 1994-11-29 | 1999-04-27 | Kone Oy | Reserve power system |
| CN2321105Y (en) * | 1997-12-30 | 1999-05-26 | 潘前鸿 | Automatic transfer device for AC power supply circuit |
Non-Patent Citations (4)
| Title |
|---|
| 刘金官等.220kV微机型备用电源自动投入装置研究.电力自动化设备25 1.2005,25(1),95-100. |
| 刘金官等.220kV微机型备用电源自动投入装置研究.电力自动化设备25 1.2005,25(1),95-100. * |
| 夏军.大高炉风机备用电源自动投入装置的设计与实现.计算技术与自动化24 3.2005,24(3),33-35. |
| 夏军.大高炉风机备用电源自动投入装置的设计与实现.计算技术与自动化24 3.2005,24(3),33-35. * |
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| CN101355340A (en) | 2009-01-28 |
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