CN101090199A - High reliable de-excitation method for generater - Google Patents
High reliable de-excitation method for generater Download PDFInfo
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- CN101090199A CN101090199A CN 200710019840 CN200710019840A CN101090199A CN 101090199 A CN101090199 A CN 101090199A CN 200710019840 CN200710019840 CN 200710019840 CN 200710019840 A CN200710019840 A CN 200710019840A CN 101090199 A CN101090199 A CN 101090199A
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Abstract
This invention relates to a stable demagnetization method, which controls de-magnet according to the time sequence at the state when a generator is faulty: 1, at the time when an excitation regulator gets an excitation trip order from a set protection device, it starts up inversion de-magnet, 2, sending the trip order to an AC de-magnet switch and a DC de-magnet switch, 3, the excitation regulator executes the inversion to set a pulse control angle an inversion angle after delta-t1, 4, closing down the output pulse of the regulator with software or hardware after inverting for delta-t2, in which, delta-t1 is in the sphere greater than 0ms but smaller than or equal to 10ms, and delta-t2 is in the sphere greater than 4ms and smaller than or equal to 10ms, and the demagnetization methods of DC, AC, inverted and non-linear resistor energy-moving and closing pulse of thyristor are used inter-grate to realize stable demagnetization.
Description
Affiliated technical field
The present invention relates to a kind of high reliable de-excitation method for generater that generator excited system is had the field suppression protection function, belong to generator excitation circuit control technology field.
Background technology
When internal fault of electric generator or generation overvoltage, for the influence of accident being reduced to minimum, require de-excitation system to shift away the electromagnetic energy of generator amature with the fastest speed, make generator voltage drop to zero apace.In recent years, along with the continuous increase of generator unit capacity, the generator amature demagnetization has also been realized changing by type to moving from energy-dissipating type, is converted into non-linear demagnetization from linear demagnetization.
At present, exciting method generally adopts certainly and encourages magnetic, its universal excitation system major loop electrical principle as shown in Figure 1, draw the excitation three-phase alternating-current supply by generator end, through excitation transformer and three-phase fully-controlled controllable silicon rectifying bridge, the generator amature winding constitutes major loop, secondary at excitation transformer, it is the input series connection three-phase alternating current field suppression switch of controlled silicon rectification bridge, output series direct current field suppression switch at controllable silicon rectifying bridge, in the two ends parallel connection of generator amature winding by nonlinear resistance and controllable silicon, the jumper that diode is formed, wherein connect with nonlinear resistance after controllable silicon and the diode reverse parallel connection, the auxiliary normally closed interlock of direct current field suppression switch is with diode and controllable silicon parallel connection.
Below a few class deexcitation methods commonly used are at present done simple the introduction.
1, direct current (nonlinear resistance moves energy) demagnetization
Adopt " direct current field suppression switch+nonlinear resistance+direct current field suppression switch is assisted normally closed interlock " among Fig. 1 can realize that direct current (nonlinear resistance) moves the energy demagnetization, during demagnetization, the disjunction of direct current field suppression switch, utilize the electric arc that produces, set up enough arc voltages, utilize this voltage to come the conducting nonlinear resistance, generator rotor current is transferred to the nonlinear resistance loop, consume the magnetic energy of generator amature by resistance heating.The subject matter of this class demagnetization mode is relatively difficulty of direct current field suppression switch type selecting, if little unit selects big switch, cost selects little switch not satisfy working condition requirement than higher; And the selection of the dc switch of large-scale especially huge hydroelectric generator unit is more difficult, simultaneously at more and more jumbo unit, dc switch builds pressure and also there is the problem of limitation and fail safe in arc-rupturing capacity, and because the demagnetization mode is single, also exists the hidden danger of switch tripping simultaneously.
2, ac de-excitation
Adopt " three-phase alternating current field suppression switch+jumper+sealing controllable silicon pulse " among Fig. 1 can realize ac de-excitation.The basic principle of ac de-excitation is to utilize AC power negative half period assist exchanging circuit, in order to realize ac de-excitation, needs to cooperate and adopts sealing controllable silicon pulse measure, and promptly in the disjunction of three-phase alternating current field suppression switch, rectifier bridge silicon controlled pulse input is fallen in locking.The subject matter of this class demagnetization mode is when AC side voltage low (as the machine terminal shortcircuit) or sealing controllable silicon pulse failure, can not realize demagnetization.
At reliability and the security requirement higher problem of big capacity unit for de-excitation system, the simple lifting that relies on direct current field suppression switch or three-phase alternating current field suppression switch performance, be difficult to meet the demands, press for a kind of can be reliable under big capacity machine set condition, the method for safe demagnetization.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of present AC and DC deexcitation method, and a kind of high reliable de-excitation method for generater is provided.
The technical scheme that the present invention solves its technical problem employing is as follows: a kind of high reliable de-excitation method for generater, be used for following energized circuit: by three-phase alternating-current supply, excitation transformer and three-phase controllable silicon rectifier bridge, in the loop that generator amature constitutes, the input series connection three-phase alternating current field suppression switch of controllable silicon rectifying bridge, output series direct current field suppression switch at controllable silicon rectifying bridge, in the two ends parallel connection of generator amature winding by nonlinear resistance and controllable silicon, the jumper that diode is formed, wherein connect with nonlinear resistance after controllable silicon and the diode reverse parallel connection, the auxiliary normally closed interlock of direct current field suppression switch is in parallel with controllable silicon and diode, it is characterized in that under generator accidental shutdown operating mode, controlling demagnetization: (1) by following time sequencing, field regulator is when the unit protective device obtains the excitation trip signal, the program start inversion field suppression; (2), meanwhile, this trip signal is issued ac de-excitation circuit breaker and direct current field suppression switch; (3), after the Δ t1 time, the field regulator inversion is carried out, putting the pulse pilot angle is the inversion angle; (4), adjuster inversion Δ t2 is after the time, with the output pulse of software or hardware mode locking adjuster, wherein the scope of Δ t1 is for greater than zero millisecond and be less than or equal to 10 milliseconds, the scope of Δ t2 is for greater than 4 milliseconds and be less than or equal to 10 milliseconds.
Beneficial effect of the present invention is as follows: consider that direct current field suppression switch, ac de-excitation circuit breaker all have tens milliseconds operate time usually, with direct current demagnetization, ac de-excitation, inversion field suppression, nonlinear resistance move can demagnetization etc. in addition integrated application of method and sealing controllable silicon pulse measure, design demagnetization action sequence control method accurately and reliably, various operating modes at big capacity unit are in service, realize highly reliable, the high security demagnetization of generator with the shortest demagnetizing time:
During orderly closedown, be inversion field suppression, the direct current field suppression switch is failure to actuate, and ac de-excitation circuit breaker plays buffer action.
Under accident emergency shutdown situation
Sequencing control is inversion at first, sets up back-pressure in DC side, helps the transfer of rotor current to nonlinear resistance.For the sufficiently high unit of anode voltage, inversion just can successfully be transferred to generator rotor current in the nonlinear resistance and go, and finishes demagnetization;
When adjuster was out of control, sequencing control was sealed the controllable silicon pulse, the arc voltage that utilizes the negative half-wave of controllable silicon anode voltage to cooperate switch motion to set up, and the conducting nonlinear resistance is transferred to generator rotor current in the nonlinear resistance and to be gone;
When the silicon controlled anode voltage is not high enough, sequencing control is carried out ac de-excitation, the arc voltage of ac de-excitation circuit breaker can be added on the anode voltage, make when the negative half period dc switch disjunction of anode voltage, guarantee to set up the voltage of enough nonlinear resistance conductings, realize the transfer of rotor current to de-excitation resistance;
If the measure of sealing controllable silicon pulse has also been failed, according to sequencing control, if then the tripping ac de-excitation circuit breaker time regulator pulses disappear, then be equal to the pulse of sealing controllable silicon and cooperate AC and DC field suppression switch demagnetization;
If jumping the ac de-excitation circuit breaker afterpulse still exists, then at first be converted to the afterflow demagnetization after the longest 10 milliseconds, the direct current field suppression switch only need produce greater than the arc voltage of non-linear de-excitation resistance residual voltage and just can finish the transfer of generator rotor current to non-linear de-excitation resistance this moment;
Even field regulator is out of control, sealing controllable silicon pulse failure, ac de-excitation circuit breaker and direct current field suppression switch have any one tripping, still can finish demagnetization.
As seen through the above analysis, use sequential control method of the present invention and carry out demagnetization, not only can overcome the potential safety hazard under the various operating conditions of generator, realize highly reliable, high security demagnetization, and save the control resource, realize quick de-excitation.
Description of drawings
Fig. 1 is universal generator excited system electrical principle schematic diagram.
Fig. 2 is the generator accident emergency shutdown demagnetization sequential chart under the demagnetization timing method control of the present invention.
Embodiment
As shown in Figure 2, when generating set accident is shut down (is example with 50 hertz), field regulator control inversion (inversion postpones about 6-7ms than the tripping operation order) is issued in the tripping operation order simultaneously, while is controlled demagnetization by demagnetization timing method of the present invention behind the inversion field suppression of 1 to 2 control cycle of adjuster, among the figure, Δ t1 is that adjuster is received the time that inversion makes inversion begin; Δ t2 is that inversion begins the time to pulse blocking, and Δ t3 is the time of ac de-excitation circuit breaker action, and Δ t4 is dc switch master fracture operate time, and Δ t5 is the operate time of the normally closed auxiliary fracture of dc switch prior to main fracture.Typical duration is as follows: Δ t1 is 6 to 7 milliseconds, and Δ t2 is 6 to 7 milliseconds, and Δ t3 is 60 milliseconds, and Δ t4 is 60 to 80 milliseconds, and Δ t5 is 1 to 2 millisecond.
Among the embodiment, the voltage of establishing two ends of rotor is U
0, direct current field suppression switch fracture voltage is U
k, the rectifier bridge output voltage is U
zThe electric current that flows through the direct current field suppression switch is I
k, excitation transformer secondary output current is respectively I
a, I
bAnd I
cThe voltage-current characteristic expression formula of whole group nonlinear resistance is U=1005.4i
0.05The initial condition of demagnetization is: exciting current is 10863A, and the rated voltage of controllable silicon anode is got 1243V, and generator amature resistance is got 0.1144 Ω, and inductor rotor is got 0.943H.
Claims (2)
1, high reliable de-excitation method for generater, be used for following energized circuit: by three-phase alternating-current supply, excitation transformer and three-phase controllable silicon rectifier bridge, in the loop that generator amature constitutes, the input series connection three-phase alternating current field suppression switch of controllable silicon rectifying bridge, output series direct current field suppression switch at controllable silicon rectifying bridge, in the two ends parallel connection of generator amature winding by nonlinear resistance and controllable silicon, the jumper that diode is formed, wherein connect with nonlinear resistance after controllable silicon and the diode reverse parallel connection, the auxiliary normally closed interlock of direct current field suppression switch is in parallel with controllable silicon and diode, it is characterized in that under generator accidental shutdown operating mode, controlling demagnetization: (1) by following time sequencing, field regulator is when the unit protective device obtains the excitation trip signal, and program start is against handing over demagnetization; (2), meanwhile, this trip signal is issued ac de-excitation circuit breaker and direct current field suppression switch; (3), after the Δ t1 time, the field regulator inversion is carried out, putting the pulse pilot angle is the inversion angle; (4), adjuster inversion Δ t2 is after the time, with the output pulse of software or hardware mode locking adjuster, wherein the scope of Δ t1 is for greater than zero millisecond and be less than or equal to 10 milliseconds, the scope of Δ t2 is for greater than 4 milliseconds and be less than or equal to 10 milliseconds.
2, high reliable de-excitation method for generater according to claim 1 is characterized in that: the scope of Δ t1 is 6 to 7 milliseconds, and the scope of Δ t2 is 6 to 7 milliseconds.
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| CN 200710019840 CN101090199A (en) | 2007-01-31 | 2007-01-31 | High reliable de-excitation method for generater |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977004A (en) * | 2010-08-18 | 2011-02-16 | 国电南瑞科技股份有限公司 | Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper |
| CN101702609B (en) * | 2009-11-10 | 2011-07-20 | 国电南瑞科技股份有限公司 | Generator de-excitation method by utilizing auxiliary inversion pulse generator to participate in de-excitation |
| CN101783497B (en) * | 2010-01-27 | 2013-05-29 | 东方电气集团东方电机有限公司 | Multi-mode redundant field suppression protection loop |
| CN104201651A (en) * | 2014-08-29 | 2014-12-10 | 南京南瑞继保电气有限公司 | Intelligent field suppression control method for generator |
| CN107359831A (en) * | 2017-09-01 | 2017-11-17 | 南京国电南自维美德自动化有限公司 | A kind of intelligence envelope pulse system and method |
| CN109617478A (en) * | 2018-12-17 | 2019-04-12 | 四川茂龙发电设备制造有限公司 | A kind of Excitation Control System of Synchronization Generator |
| CN113162495A (en) * | 2021-05-14 | 2021-07-23 | 济南安瑞信源机电设备有限公司 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
| CN113644850A (en) * | 2021-07-12 | 2021-11-12 | 南京国电南自维美德自动化有限公司 | Pulse mixed transmission method and system of excitation system |
-
2007
- 2007-01-31 CN CN 200710019840 patent/CN101090199A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702609B (en) * | 2009-11-10 | 2011-07-20 | 国电南瑞科技股份有限公司 | Generator de-excitation method by utilizing auxiliary inversion pulse generator to participate in de-excitation |
| CN101783497B (en) * | 2010-01-27 | 2013-05-29 | 东方电气集团东方电机有限公司 | Multi-mode redundant field suppression protection loop |
| CN101977004A (en) * | 2010-08-18 | 2011-02-16 | 国电南瑞科技股份有限公司 | Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper |
| CN104201651A (en) * | 2014-08-29 | 2014-12-10 | 南京南瑞继保电气有限公司 | Intelligent field suppression control method for generator |
| CN107359831A (en) * | 2017-09-01 | 2017-11-17 | 南京国电南自维美德自动化有限公司 | A kind of intelligence envelope pulse system and method |
| CN107359831B (en) * | 2017-09-01 | 2019-12-10 | 南京国电南自维美德自动化有限公司 | intelligent pulse sealing system and method |
| CN109617478A (en) * | 2018-12-17 | 2019-04-12 | 四川茂龙发电设备制造有限公司 | A kind of Excitation Control System of Synchronization Generator |
| CN113162495A (en) * | 2021-05-14 | 2021-07-23 | 济南安瑞信源机电设备有限公司 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
| CN113162495B (en) * | 2021-05-14 | 2022-05-03 | 济南安瑞信源机电设备有限公司 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
| CN113644850A (en) * | 2021-07-12 | 2021-11-12 | 南京国电南自维美德自动化有限公司 | Pulse mixed transmission method and system of excitation system |
| CN113644850B (en) * | 2021-07-12 | 2023-12-22 | 南京国电南自维美德自动化有限公司 | Pulse hybrid transmission method and system of excitation system |
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