CN101977004A - Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper - Google Patents
Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper Download PDFInfo
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- CN101977004A CN101977004A CN 201010256486 CN201010256486A CN101977004A CN 101977004 A CN101977004 A CN 101977004A CN 201010256486 CN201010256486 CN 201010256486 CN 201010256486 A CN201010256486 A CN 201010256486A CN 101977004 A CN101977004 A CN 101977004A
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Abstract
The invention discloses a large current deexcitation loop based on silicon controlled rectifier (SCR) subject to multi-redundancy trigger control of a jumper. A generator end leads out an excitation three-phase alternating-current supply which combines an exciting transformer, a three-phase full-SCR rectifier bridge and a generator rotor winding to form a main loop; the output end of the SCR rectifier bridge is connected with a direct current deexcitation switch in series; and the two ends of the generator rotor winding are connected with an electronic jumper in parallel for deexcitation. The invention is characterized in that the electronic jumper comprises a deexcitation resistor and a forward and reverse SCR which is connected with the deexcitation resistor in series and comprises a forward SCR and n reverse SCRs which are connected with one another in parallel, wherein n is more than or equal to 2; and each SCR is triggered by a pulse loop corresponding to each SCR. The deexcitation loop not only effectively solves the technical problem of large capacity set and large current deexcitation, but also obviously improves the reliability of the whole deexcitation loop.
Description
Technical field
The present invention relates to a kind of highly reliable big electric current deexcitation method of generator that heavy-duty generator group excitation system is had the field suppression protection function, belong to generator excitation circuit control technology field.
Background technology
In recent years, along with the continuous increase of generator unit single-machine capacity, the exciting current of synchronous generator rotor side is increasing, and the at present big exciting current of capacity unit under nominal load is usually up to 4000-8000A.When bringing out bad working environments such as existing three phase short circuit fault, unloaded mistake Qiang Li when these generator machines, exciting current during its fault can be considerably beyond the exciting current under the nominal load, usually require the maximum demagnetization electric current of generator can reach more than the amperes up to ten thousand, big electric current demagnetizing technology is had higher requirement.Therefore, have only the through-current capability that increases jumper in the eliminating magnetism of generator loop, can satisfy the needs of demagnetization under the serious operating mode of big capacity unit.
As everyone knows, when generator generation internal fault or overvoltage, for the influence of accident being reduced to minimum, require de-excitation system to go out the electromagnetic energy safe transfer that is stored in the generator amature with the fastest speed, make generator terminal voltage drop to zero apace.So in order effectively to eliminate the huge energy that stores in the generator amature fast, rapid and reliable deexcitation method is crucial.
At present, the excitation mode of heavy-duty generator group generally adopts certainly and encourages magnetic, Fig. 1 is universal forward controllable silicon, backward diode jumper deexcitation method schematic diagram, draw the excitation three-phase alternating-current supply by generator end, constitute major loop through excitation transformer and three-phase fully-controlled controllable silicon rectifying bridge, generator amature winding, at the output series direct current field suppression switch of controllable silicon rectifying bridge, electronics jumper in parallel carries out demagnetization at generator amature winding two ends.The electronics jumper generally is composed in series by linear resistance nonlinear resistances such as (or) SiC/ZnO and forward and reverse controllable silicon (or diode), wherein the forward controllable silicon mainly act on be restriction forward spike overvoltage and during for the rotor sideslip utmost point negative sequence component path is provided, oppositely the main effect of controllable silicon (or diode) is to provide path for rotor current when the needs demagnetization, to eliminate the huge energy that stores in the rotor.
Below a few class controllable silicons (or diode) of jumper at present commonly used are used in simple introduction of mode of connection work of magnetism elimination circuit DC side:
1. forward controllable silicon, the backward diode demagnetization
Fig. 1 is universal forward controllable silicon, backward diode jumper deexcitation method schematic diagram, and G1 is a controllable silicon among the figure, and the equal diode of D2, this magnetism elimination circuit are applicable to that mainly de-excitation resistance only is the situation of nonlinear resistance ZnO, and applicable surface is narrower.Wherein the forward controllable silicon is mainly used in overvoltage protection control.Because the nonlinear characteristic of ZnO is apparent in view, leakage current is very little when normally moving, and tens uA are generally only arranged, and therefore oppositely need not serial connection controllable silicon again, only need install a series diode additional.When rotor-side back-pressure occurred and needs demagnetization, this diode can natural conducting, thereby constitutes the demagnetization path with nonlinear resistance ZnO, finishes reliable demagnetization function.In general, this jumper demagnetization capacity can be subjected to the restriction of diode through-current capability.
2. forward controllable silicon, oppositely controllable silicon demagnetization
Fig. 2 is universal forward controllable silicon, reverse controllable silicon jumper deexcitation method schematic diagram, G1 among the figure, G2 is controllable silicon, and this magnetism elimination circuit applicable surface is wider, and can satisfy de-excitation resistance is nonlinear resistance ZnO, nonlinear resistance SiC, the situation of several different de-excitation resistances such as linear resistance.The de-excitation resistance loop is by its break-make attitude of SCR control of forward and reverse parallel connection.Wherein the forward controllable silicon is mainly used in overvoltage protection control.Oppositely mainly to act on be demagnetization to silicon controlled, and when rotor-side back-pressure occurred and needs demagnetization, control loop sent control impuls at once, makes the reverse controllable silicon can triggering and conducting, thereby constitute the demagnetization path with nonlinear resistance ZnO, finishes reliable demagnetization function.In general, forward and reverse controllable silicon all uses single controllable silicon in this jumper, and the demagnetization capacity can be subjected to the restriction of controllable silicon through-current capability.In addition, single silicon controlled jumper deexcitation method is not considered redundant loop, in case controllable silicon triggers failure, often exists the reliably shortcoming of demagnetization.
Concerning conventional capacity unit because the demagnetization capacity is little, more than two kinds of jumpers can satisfy its demagnetization requirement.But concerning big capacity unit, conventional jumper more and more can not adapt to the needs of big electric current demagnetization.So, in order to improve the demagnetization capacity and the reliability of big capacity unit, consider to adopt the controllable silicon method of a plurality of high parameters in parallel on the de-excitation system jumper, the through-current capability when significantly improving demagnetization can satisfy the requirement of big electric current demagnetization under the serious operating mode of big capacity unit;
, a plurality of controllable silicons in parallel are not to be the simple and linked method of general circuit on the jumper, need resolve the reliable demagnetization that technical problems such as controllable silicon current-sharing, synchronous triggering could guarantee whole loop.If it is bad that these problems are handled, will make demagnetization unsuccessful, give the consequence of bringing on a disaster property of generator unit.
Summary of the invention
Technical problem to be solved by this invention is that solution heavy-duty generator unit demagnetization electric current is excessive, single controllable silicon jumper can't satisfy the requirement of maximum demagnetization operating mode demagnetization, and overcome the unreliable shortcoming of present single silicon controlled jumper deexcitation method, provide a kind of various operating modes of suitable big capacity unit in service, when can realize highly reliable, high security demagnetization, strive for the high reliable de-excitation method for generater of short demagnetizing time.
For solving the problems of the technologies described above, the invention provides a kind of based on the many redundant big electric current magnetism elimination circuits of control silicon controlled that trigger of jumper, 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, output series direct current field suppression switch at controllable silicon rectifying bridge, electronics jumper in parallel carries out demagnetization at generator amature winding two ends, it is characterized in that: forward and reverse controllable silicon that described electronics jumper comprises de-excitation resistance and connects with de-excitation resistance, described forward and reverse controllable silicon comprises a forward controllable silicon and n reverse controllable silicon parallel with one another, n 〉=2 wherein, each controllable silicon are triggered by separately pulse circuit respectively.
Aforesaid based on the many redundant big electric current magnetism elimination circuits of control silicon controlled that trigger of jumper, it is characterized in that: described de-excitation resistance is linear resistance or nonlinear resistance (ZnO or SiC).
Aforesaid based on the many redundant big electric current magnetism elimination circuits of control silicon controlled that trigger of jumper, it is characterized in that: each pulse circuit triggered time is identical.
The beneficial effect that the present invention reached:
Utilize many controllable silicons redundant field suppression of the present invention loop to carry out big electric current demagnetization, for example a plurality of controllable silicons such as G1, G2...Gn constitute the redundant field suppression loop, simultaneously, trigger control loop and adopt redundant triggering technique, a plurality of controllable silicons to parallel connection carry out independent synchronous triggering, thereby guarantee that each controllable silicon can both reliably trigger, and adopt the strong means such as triggering control impuls that trigger, improve, can effectively improve the triggering power of controllable silicon gate pole, effectively improve the reliability that triggers control; This magnetism elimination circuit not only efficiently solves the technical barrier of the big electric current demagnetization of big capacity unit, has also significantly improved the reliability of whole magnetism elimination circuit.
In addition, the present invention can well realize the cascade expansion of system, guarantees that two and above controllable silicon all work simultaneously, really accomplishes big electric current demagnetization high reliability, effectively discharges the rotor-side energy, protects the safety of main equipments such as generator.
Description of drawings
Fig. 1 is universal forward controllable silicon, backward diode jumper deexcitation method schematic diagram;
Fig. 2 is universal forward controllable silicon, oppositely controllable silicon jumper deexcitation method schematic diagram;
Fig. 3 is the many redundant big electric current deexcitation method of control silicon controlled schematic diagrames that triggers of the present invention;
Fig. 4 is pulsed triggering circuit figure.
Embodiment
Fig. 3 is the many redundant big electric current deexcitation method of control silicon controlled schematic diagrames that triggers of the present invention, among the present invention, the major loop jumper adopts reverse many controllable silicons redundant field suppression loop, and as with a plurality of controllable silicons (G1, G2...Gn etc.) parallel connection, connecting with nonlinear resistance then constitutes magnetism elimination circuit.A plurality of controllable silicons (G1, G2...Gn etc.) to parallel connection in the pulse control loop carry out independent synchronous triggering, thereby guarantee that each controllable silicon can both reliably trigger, and realize the magnetism elimination circuit of many redundant parallels.
The present invention is directed to the problem of excessive, the single controllable silicon of present heavy-duty generator unit demagnetization electric current safe and reliable demagnetization requirement can't satisfy the most serious operating mode the time, on the basis of using for reference conventional magnetism elimination circuit jumper, courageously two of employings even a plurality of controllable silicon are in parallel, be used for improving the through-current capability of whole magnetism elimination circuit, i.e. many controllable silicons redundant field suppression loop.The basic characteristics of this magnetism elimination circuit are: the first, and in the demagnetization control loop, adopt a plurality of controllable silicons parallel connections to connect with the nonlinear resistance loop; The second, controllable silicon in parallel adopts the element of same producer, same model, and considers to adopt the thyristor of high parameter as far as possible; The 3rd, each controllable silicon characterisitic parameter also should match as far as possible, preferably can confirm that its current-sharing is respond well by related experiment, this point is extremely important, must not be careless simply in parallel, otherwise the current-sharing effect is difficult to reach requirement, seriously reduces the demagnetization capacity in whole loop.Adopt many controllable silicons redundant field suppression loop, compare with the single silicon controlled jumper of routine and to have following two advantages at least: the one, overcome the little deficiency of present single silicon controlled jumper demagnetization capacity by the parallel connection of many controllable silicons, effectively improve the through-current capability of whole magnetism elimination circuit, solved the technical barrier of the big electric current demagnetization of big capacity unit.The 2nd, by the redundant loop of a plurality of controllable silicons formation in parallel, the unsuccessful drawback of triggering and conducting when being used for overcoming single silicon controlled jumper demagnetization, even the unsuccessful situation of indivedual controllable silicon conductings occurs, still can constitute magnetism elimination circuit after the controllable silicon conducting of other most of parallel connections, be unlikely to cause whole magnetism elimination circuit to completely lose the demagnetization function, significantly improve the reliability of whole magnetism elimination circuit.
The present invention triggers the many silicon controlleds of parallel connection generally following two kinds of control methods, and a kind of is to adopt all controllable silicons of pulse circuit common trigger, and another kind of method adopts independent pulse circuit to trigger separately respectively exactly.If the shared simply trigger impulse loop of several controllable silicons in parallel, this requires too high to the synchronism that controllable silicon triggers, the power requirement in paired pulses loop is also very high, can not make the equal conducting of controllable silicon in parallel in actual the use, and this is to cause the controllable silicon of conducting to damage probably.So in order to cooperate many controllable silicons redundant field suppression loop, should adopt the redundant control strategy that triggers of many controllable silicons, could really resolve the problem that triggers power and two aspects of reliable trigger.The basic characteristics of this magnetism elimination circuit are: the first, adopt a plurality of independent triggers pulse circuits, and each loop is independent of each other, the redundant respectively controllable silicon that triggers; The second, guarantee that each pulse circuit can keep the synchronous of height, thereby guarantee that each controllable silicon can both trigger simultaneously; The 3rd, adopt means such as triggering, improve trigger waveform by force, effectively improve the triggering power of pulse circuit.Fig. 4 is pulsed triggering circuit figure, device description among Fig. 4: R: the restriction electric current constitutes discharge loop for C simultaneously; Di1: afterflow, the energy of release coil; Di2: the low level of getting pulse triggers; RO: current-limiting resistance; DO1: afterflow, the energy of release coil; DO2: eliminate the negative output pulse.
Major technique characteristics of the present invention are independent pulse circuit, the redundant triggering.Only in this way, could guarantee the conducting that can both be triggered reliably simultaneously of each controllable silicon, be the core technology that many controllable silicons redundant field suppression technology can successful Application.
The jumper of using the big electric current demagnetization of the present invention triggers control method and carries out demagnetization, by many redundancies (two redundancies even 3 and the many redundancies of above branch road) method, effectively solves a difficult problem that triggers control loop and major loop coupling.
On-the-spot test and industrialization operation test result show that the demagnetization that utilizes this method to carry out big unit has high reliability, not only can overcome the potential safety hazard under the various operating conditions of generator, can also realize high reliability, high security, rapidity demagnetization.It is big to efficiently solve large-scale unit demagnetization electric current, the industry technical barrier of demagnetization difficulty.
Below disclose the present invention with preferred embodiment, so it is not in order to restriction the present invention, and all employings are equal to replaces or technical scheme that the equivalent transformation mode is obtained, all drops within protection scope of the present invention.
Claims (3)
1. one kind based on the many redundant big electric current magnetism elimination circuits of control silicon controlleds that trigger of jumper, 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, output series direct current field suppression switch at controllable silicon rectifying bridge, electronics jumper in parallel carries out demagnetization at generator amature winding two ends, it is characterized in that: forward and reverse controllable silicon that described electronics jumper comprises de-excitation resistance and connects with de-excitation resistance, described forward and reverse controllable silicon comprises a forward controllable silicon and n reverse controllable silicon parallel with one another, n 〉=2 wherein, each controllable silicon are triggered by separately pulse circuit respectively.
2. according to claim 1 based on the many redundant big electric current magnetism elimination circuits of control silicon controlled that trigger of jumper, it is characterized in that: described de-excitation resistance is linear resistance or nonlinear resistance.
3. according to claim 1 and 2 based on the many redundant big electric current magnetism elimination circuits of control silicon controlled that trigger of jumper, it is characterized in that: each pulse circuit triggered time is identical.
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| CN 201010256486 CN101977004A (en) | 2010-08-18 | 2010-08-18 | Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper |
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| CN 201010256486 CN101977004A (en) | 2010-08-18 | 2010-08-18 | Large current deexcitation loop based on silicon controlled rectifier subject to multi-redundancy trigger of jumper |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386827A (en) * | 2011-11-03 | 2012-03-21 | 东方电气集团东方电机有限公司 | High-voltage resistant jumper and de-excitation protective circuit based on same |
| CN102684156A (en) * | 2012-03-15 | 2012-09-19 | 哈尔滨电机厂有限责任公司 | Field discharge and overvoltage protective device for large-sized generator rotor |
| CN105093034A (en) * | 2015-09-01 | 2015-11-25 | 中国长江电力股份有限公司 | De-excitation time-based circuit and method for detecting performance of silicon carbide de-excitation resistor |
| CN105471342A (en) * | 2015-12-31 | 2016-04-06 | 上海发电设备成套设计研究院 | Rapid de-excitation apparatus and method for rod control generator for nuclear power plant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101090199A (en) * | 2007-01-31 | 2007-12-19 | 国网南京自动化研究院 | High reliable de-excitation method for generater |
| CN201004550Y (en) * | 2007-01-31 | 2008-01-09 | 国网南京自动化研究院 | Magnetism extinguishment over voltage protection circuit for power generator |
| CN101783497A (en) * | 2010-01-27 | 2010-07-21 | 东方电气集团东方电机有限公司 | Multi-mode redundant field suppression protection loop |
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- 2010-08-18 CN CN 201010256486 patent/CN101977004A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101090199A (en) * | 2007-01-31 | 2007-12-19 | 国网南京自动化研究院 | High reliable de-excitation method for generater |
| CN201004550Y (en) * | 2007-01-31 | 2008-01-09 | 国网南京自动化研究院 | Magnetism extinguishment over voltage protection circuit for power generator |
| CN101783497A (en) * | 2010-01-27 | 2010-07-21 | 东方电气集团东方电机有限公司 | Multi-mode redundant field suppression protection loop |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386827A (en) * | 2011-11-03 | 2012-03-21 | 东方电气集团东方电机有限公司 | High-voltage resistant jumper and de-excitation protective circuit based on same |
| CN102386827B (en) * | 2011-11-03 | 2014-05-28 | 东方电气集团东方电机有限公司 | High-voltage resistant jumper and de-excitation protective circuit based on same |
| CN102684156A (en) * | 2012-03-15 | 2012-09-19 | 哈尔滨电机厂有限责任公司 | Field discharge and overvoltage protective device for large-sized generator rotor |
| CN105093034A (en) * | 2015-09-01 | 2015-11-25 | 中国长江电力股份有限公司 | De-excitation time-based circuit and method for detecting performance of silicon carbide de-excitation resistor |
| CN105471342A (en) * | 2015-12-31 | 2016-04-06 | 上海发电设备成套设计研究院 | Rapid de-excitation apparatus and method for rod control generator for nuclear power plant |
| CN105471342B (en) * | 2015-12-31 | 2018-09-18 | 上海发电设备成套设计研究院 | A kind of device and method of nuclear power station stick control generator quick de-excitation |
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Application publication date: 20110216 |