CN207321150U - A kind of system for solving the problems, such as the cutout of nuclear power generating sets excitation step - Google Patents
A kind of system for solving the problems, such as the cutout of nuclear power generating sets excitation step Download PDFInfo
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- CN207321150U CN207321150U CN201721437103.XU CN201721437103U CN207321150U CN 207321150 U CN207321150 U CN 207321150U CN 201721437103 U CN201721437103 U CN 201721437103U CN 207321150 U CN207321150 U CN 207321150U
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Abstract
The utility model discloses a kind of system for solving the problems, such as the cutout of nuclear power generating sets excitation step, including：Generator, including generator amature winding and main generator；Automatic voltage regulator, is connected with the main generator, for obtaining the voltage and current of the main generator, and the pulse for corresponding to certain Trigger Angle is produced according to the main generator voltage and current；Power rectification device, is connected with the automatic voltage regulator, the generator amature winding respectively, for being exported according to the pulse regulation to the exciting current of the generator amature winding, to adjust the voltage and current of the main generator；And continued flow resistance, it is connected in parallel between the positive-negative output end of the power rectification device, for preventing excitation step from stopping.The utility model can effectively prevent that excitation stops during step response, improves the stability of excitation system work.
Description
Technical field
It the utility model is related to nuclear power plant's technical field, more particularly to a kind of nuclear power generating sets excitation system.
Background technology
National standard GB/T7409.3-2007《Large and medium-sized synchronous generator excited system technical requirements》Section 5.12, regulation：
In the case of unloaded rated voltage, when it is ± 10% that generator voltage, which gives step amount, generator voltage overshoot should be not more than
The 50% of step amount.But the adjustment of field excitation module of nuclear power generating sets excitation system in the prior art carries out unloaded negative step
During operation, find there is exception, show as the abnormal phenomenon that exciting current crosses silicon-controlled shut-off demagnetization after 0, that is, excitation rank occur
Jump cutout so that excitation system job insecurity.
Utility model content
For above-mentioned problems of the prior art, the utility model provides a kind of solution nuclear power generating sets excitation step
The system of cutout problem, can effectively prevent excitation step from stopping, and improve the stability of excitation system work.
The technical solution that the utility model is proposed with regard to above-mentioned technical problem is as follows：
The example of the utility model provides a kind of nuclear power generating sets excitation system, including：
Generator, including generator amature winding and main generator；
Automatic voltage regulator, is connected with the main generator, for obtaining the voltage and current of the main generator, and
The pulse of corresponding certain Trigger Angle is produced according to the main generator voltage and current；
Power rectification device, is connected with the automatic voltage regulator, the generator amature winding, for basis respectively
The pulse regulation is exported to the exciting current of the generator amature winding, to adjust the voltage of the main generator and electricity
Stream；And
Continued flow resistance, is connected in parallel between the positive-negative output end of the power rectification device, for preventing excitation step from stopping.
Further, the system also includes converting unit；
The converting unit is connected between the main generator and the automatic voltage regulator；
The converting unit is used to change the voltage and current of the main generator, adjusts the automatic voltage
Device inputs transformed voltage and current.
Further, the converting unit includes current transformer and voltage transformer；
The current transformer is connected with the main generator, the automatic voltage regulator respectively, the mutual induction of voltage
Device is connected with the current transformer, the automatic voltage regulator respectively；
The current transformer is used to the primary current of the main generator being converted to secondary current；
The voltage transformer is used to the primary voltage of the main generator being converted to secondary voltage.
Further, the system also includes exciter stator winding, exciter rotor winding and rotating rectifier；
The continued flow resistance is connected in parallel between the positive-negative input end of the exciter stator winding；The exciter rotor around
Group is connected with the rotating rectifier, and the rotating rectifier is connected with the generator amature winding；
The power rectification device, which is used to be exported according to the pulse, adjusts electric current to the exciter stator winding；
The rotating rectifier is used to the alternating voltage of exciter rotor winding sensing being converted to DC voltage, with
Exciting current is exported to the generator amature winding.
Further, the system also includes field switch；
The field switch is connected between the power rectification device and the exciter stator winding.
Further, the system also includes exciting transformer；
The exciting transformer is connected between the main generator and the power rectification device；
The exciting transformer is used to provide power supply to the power rectification device.
Preferably, the continued flow resistance is the resistance that resistance value is 300 Ω.
Preferably, the automatic voltage regulator is the adjustable adjuster of narrow pulse width.
Preferably, the automatic voltage regulator is the adjuster that adjusted narrow pulse width is 140uS.
Preferably, the power rectification device is controllable silicon rectifying bridge.
The technical solution of the utility model has the following technical effect that：
Nuclear power generating sets excitation system provided by the utility model, by parallel in power rectification device positive and negative anodes output terminal
Continued flow resistance, there is provided power rectification device turns on the current loop at initial stage in adjustment of field excitation module, reduces inductive load to power
Fairing turns on the influence at initial stage, so as to avoid stopping, improves the stability of excitation system work；Increase automatic voltage to adjust
The width of the trigger pulse of device (AVR), improves the ducting capacity again of power rectification device, further avoids step cutout from asking
Topic.
Brief description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the utility model
Example is applied, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structure diagram of the nuclear power generating sets excitation system in the utility model embodiment one；
Fig. 2 is the structural representation of the power rectification device in the nuclear power generating sets excitation system in the utility model embodiment one
Figure；
Fig. 3 is the concrete structure of the power rectification device in the nuclear power generating sets excitation system in the utility model embodiment one
Schematic diagram；
Fig. 4 is the dynamic characteristic of the power rectification device in the nuclear power generating sets excitation system in the utility model embodiment one
Curve map；
Fig. 5 is the concrete structure schematic diagram of the nuclear power generating sets excitation system in the utility model embodiment one.
Embodiment
There are the technical problem that step stops for the nuclear power generating sets excitation system of the prior art for the utility model, there is provided
A kind of nuclear power generating sets excitation system, its core concept are：Generator, adjustment of field excitation module, power rectification device and parallel connection are provided
Continued flow resistance between power rectification device positive-negative output end, there is provided power rectification device turns on initial stage in adjustment of field excitation module
Current loop, reduce influence of the inductive load to power rectification device conducting initial stage, so as to avoid stopping, improve excitation system
The stability of work.
Embodiment one：
As shown in Figure 1, a kind of nuclear power generating sets excitation system is present embodiments provided, including：
Generator, including generator amature winding L1 and main generator G；
Automatic voltage regulator 21, is connected with the main generator G, for obtaining the voltage and electricity of the main generator G
Stream, and the pulse for corresponding to certain Trigger Angle is produced according to the voltage and current of the main generator G；
Power rectification device 22, is connected with the automatic voltage regulator 21, the generator amature winding L1 respectively, uses
Exported according to the pulse regulation to the exciting current of the generator amature winding L1, to adjust the main generator G's
Voltage and current；And
Continued flow resistance R, is connected in parallel between the positive-negative output end of the power rectification device 22, for preventing excitation step from breaking
Stream.
It should be noted that the positive-negative input end of power rectification device and the both ends of continued flow resistance connect.By in excitation
Increase continued flow resistance in system to optimize load characteristic, exciting current is able to maintain that the conducting of power rectification device, so as to keep away
Exempt to stop.
It should be noted that there is built-in variable recording inside automatic voltage regulator (AVR).It is as shown in Fig. 2, right
Generator of the prior art carries out electric to automatic voltage regulator (AVR) builtin voltage setting value, generator terminal during 6% time step
Pressure, exciting current and automatic voltage regulator (AVR) output Uc have carried out recording.It can see by the waveform in Fig. 2
When 1.18S carries out step on 6%, no abnormality seen, set end voltage setting value is 24kV during even running afterwards, and set end voltage is actual
Runtime value is 24kV, and exciting current 40.8A, Trigger Angle is 85.5 °.When 9.28S carries out 6% time step, Uc instantaneously drops to 0
When, Trigger Angle is corresponded at this time as 90 °, and 9.98S causes exciting current of exciter to decline rapidly due to exciter excitation voltage negative top value
0 (occurring resolving flow problem) is reduced to, 11.50S exciting currents gradually recover, and correspond to Trigger Angle at this time as 68.0 °.
Preferably, the power rectification device is controllable silicon rectifying bridge.
It should be noted that power rectification device main element is thyristor, its operation principle turned on can use twin crystal
Body Model explains that an inclined section is such as taken on device, then thyristor is considered as two crystalline substances being made of PNP and NPN
Body pipe forms, as shown in Figure 3 and Figure 4.When dispatch from foreign news agency road direction gate pole G Injection Currents, VT1 and VT2 enter fully saturated state, brilliant lock
Pipe turns on.At this time if removing gate current, strong positive feedback has been formed inside thyristor can still maintain conducting state.If
Turn off thyristor, it is necessary to remove the forward voltage added by anode, either apply back-pressure to anode or make to flow through thyristor
Current reduction under a certain numerical value close to zero, power rectification device could turn off.
The characteristics of power rectification device is：When static, when thyristor bears backward voltage, no matter whether gate pole has triggering
Electric current, thyristor is all without conducting；When thyristor bears forward voltage, the thyristor only in the case where gate pole has trigger current
It can just turn on；For thyristor once turning on, gate pole just loses control action, no matter gate trigger current whether there is, thyristor
All it is held on；Turned off to the thyristor for making to have turned on, the effect of applied voltage and external circuit can only be utilized to make to flow through brilliant lock
The electric current of pipe drops to a certain number close to zero.During dynamic, since the positive feedback process inside thyristor needs the time, add
The limitation of external circuit inductance, after thyristor is toggled, the growth of its anode current is unlikely to be instantaneous.From gate current
At the step moment, rise to the 10% of steady-state value to anode current, be known as time delay td this periods, at the same time brilliant lock
The forward voltage drop of pipe is also reducing.The time that anode current rises to needed for the 90% of steady-state value from 10% is known as the rise time
Tr, service time tgt are sum of the two.Triode thyristor time delay is 0.5~1.5us, and the rise time is 0.5~3us.
Its time delay reduces with the increase of gate current.Rise time in addition to thyristor self character is reflected, is also subject to external circuit
Inductance seriously affects.
The phenomenon does not meet the principle of continuously smooth control.By oscillograph inspection, trigger pulse is simultaneously without exception, therefore arranges
The problem of except impulse generator.By above-mentioned analysis, there is the root of cutout problem after exciting current is reduced to zero, by
Electric current is maintained in the conducting less than thyristor, is stopped, thyristor is not easy to turn on again.
Analyzed by thyristor conduction characteristic, it is known that can cause during pulse that thyristor cannot when IGBT group is narrow
Conducting, equally when the big inductive load of thyristor load-strap, since inductance also makes the inhibition of firm turning circuit electric current
Thyristor be not easy to turn on.Based on being analyzed above, turned on again to preferably be easy to thyristor after cutout, by whole in power
The DC side of device, the i.e. positive-negative output end of power rectification device and the leakage resistance that continues are flowed, to optimize load characteristic, so as to provide
Power rectification device turns on the current loop at initial stage, reduces the influence that inductive load turns on power rectification device initial stage.
Further, the system also includes converting unit；
The converting unit is connected between the main generator and the automatic voltage regulator；
The converting unit is used to change the voltage and current of the main generator, adjusts the automatic voltage
Device inputs transformed voltage and current.
Further, as shown in figure 5, the converting unit includes Current Transmit and voltage transformer pt；
The Current Transmit is connected with the main generator G, the automatic voltage regulator 21 respectively, the voltage
Mutual inductor PT is connected with the Current Transmit, the automatic voltage regulator 21 respectively；
The Current Transmit is used to the primary current of the main generator being converted to secondary current；
The voltage transformer pt is used to the primary voltage of the main generator being converted to secondary voltage.
Further, the system comprises exciter stator winding L2, exciter rotor winding L3 and rotating rectifier 31；
The continued flow resistance R is connected in parallel between the positive-negative input end of the exciter stator winding L2；The exciter turns
Sub- winding L3 is connected with the rotating rectifier 31, and the rotating rectifier 31 is connected with the generator amature winding L1；
The power rectification device 22, which is used to be exported according to the pulse, adjusts electric current to the exciter stator winding L2；
The rotating rectifier 31 is used to the alternating voltage of exciter rotor winding L3 sensings being converted to direct current
Pressure, to provide exciting current to the generator amature winding L1.
Further, the system also includes field switch 32；
The field switch 32 is connected between the power rectification device 22 and the exciter stator winding L2.
Further, the system also includes exciting transformer T；
The exciting transformer T is connected between the main generator G and the power rectification device 22；
The exciting transformer T is used to provide power supply to excitation system.
Preferably, the continued flow resistance is the resistance that resistance value is 300 Ω.
It should be noted that exciter stator winding is 0.9 Ω, resistance heating, exciting current point during normal operation are considered
Stream etc., by and connect different valued resistors and test, final choice resistance value is that the resistance of 300 Ω is optimal continued flow resistance.And connect
95% to 80% 15% step is carried out after continued flow resistance, overshoot is only 2%, other no abnormality seens.
Preferably, the automatic voltage regulator (AVR) is the adjustable adjuster of narrow pulse width.
Preferably, the automatic voltage regulator (AVR) is the adjuster that adjusted narrow pulse width is 140uS.
It should be noted that being turned on again to preferably be easy to thyristor after cutout, it can also increase automatic voltage adjusting
The pulse width of device (AVR).The trigger pulse form of automatic voltage regulator (AVR) is burst pulse, dipulse, wherein burst pulse
Width is adjustable, is respectively 50uS, 70uS, 100uS and 140uS.The prior art uses the pulse width of 100uS, this practicality is new
The parameter of pulse width is arranged to 140uS by type, it is changed, and minimum, cost is minimum, you can prevents step cutout problem.
In conclusion the nuclear power generating sets excitation system of the utility model, by power rectification device positive-negative output end it
Between continued flow resistance in parallel, there is provided the current loop at power rectification device conducting initial stage in adjustment of field excitation module, reduces inductive load
The influence at initial stage is turned on to power rectification device, so as to avoid stopping, improves the stability of excitation system work；Increase automatic electric
The width of the trigger pulse of adjuster (AVR) is pressed, the ducting capacity again of power rectification device is improved, further avoids step from breaking
Flow problem.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within new spirit and principle, any modification, equivalent replacement, improvement and so on, should be included in the guarantor of the utility model
Within the scope of shield.
Claims (10)
- A kind of 1. system for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that including：Generator, including generator amature winding and main generator；Automatic voltage regulator, is connected with the main generator, for obtaining the voltage and current of the main generator, and according to The voltage and current of the main generator produces the pulse of corresponding certain Trigger Angle；Power rectification device, is connected with the automatic voltage regulator, the generator amature winding respectively, for according to Pulse regulation is exported to the exciting current of the generator amature winding, to adjust the voltage and current of the main generator；With AndContinued flow resistance, is connected in parallel between the positive-negative output end of the power rectification device, for preventing excitation step from stopping.
- 2. the system as claimed in claim 1 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that the system Further include converting unit；The converting unit is connected between the main generator and the automatic voltage regulator；The converting unit is used to change the voltage and current of the main generator, makes the automatic voltage regulator defeated Enter transformed voltage and current.
- 3. the system as claimed in claim 2 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that the conversion Unit includes current transformer and voltage transformer；The current transformer is connected with the main generator, the automatic voltage regulator respectively, the voltage transformer point It is not connected with the current transformer, the automatic voltage regulator；The current transformer is used to the primary current of the main generator being converted to secondary current；The voltage transformer is used to the primary voltage of the main generator being converted to secondary voltage.
- 4. the system as claimed in claim 1 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that the system Further include exciter stator winding, exciter rotor winding and rotating rectifier；The continued flow resistance is connected in parallel between the positive-negative input end of the exciter stator winding；The exciter rotor winding with The rotating rectifier connection, the rotating rectifier are connected with the generator amature winding；The power rectification device, which is used to be exported according to the pulse, adjusts electric current to the exciter stator winding；The rotating rectifier is used to the alternating voltage of exciter rotor winding sensing being converted to DC voltage, with to institute State generator amature winding output exciting current.
- 5. the system as claimed in claim 4 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that the system Further include field switch；The field switch is connected between the power rectification device and the exciter stator winding.
- 6. the system as claimed in claim 1 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that the system Further include exciting transformer；The exciting transformer is connected between the main generator and the power rectification device；The exciting transformer is used to provide power supply to the power rectification device.
- 7. the system as claimed in claim 1 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that the afterflow Resistance is the resistance that resistance value is 300 Ω.
- 8. the system as claimed in claim 1 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that described automatic Voltage regulator is the adjustable adjuster of narrow pulse width.
- 9. the system as claimed in claim 8 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that described automatic Voltage regulator is the adjuster that adjusted narrow pulse width is 140uS.
- 10. the system as claimed in claim 1 for solving the problems, such as the cutout of nuclear power generating sets excitation step, it is characterised in that the work( Rate fairing is controllable silicon rectifying bridge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721437103.XU CN207321150U (en) | 2017-10-27 | 2017-10-27 | A kind of system for solving the problems, such as the cutout of nuclear power generating sets excitation step |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721437103.XU CN207321150U (en) | 2017-10-27 | 2017-10-27 | A kind of system for solving the problems, such as the cutout of nuclear power generating sets excitation step |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510535A (en) * | 2018-12-06 | 2019-03-22 | 国电南瑞科技股份有限公司 | A kind of three-machine excitation single-phase rectifier energized circuit and continued flow resistance selection method |
-
2017
- 2017-10-27 CN CN201721437103.XU patent/CN207321150U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510535A (en) * | 2018-12-06 | 2019-03-22 | 国电南瑞科技股份有限公司 | A kind of three-machine excitation single-phase rectifier energized circuit and continued flow resistance selection method |
| CN109510535B (en) * | 2018-12-06 | 2022-01-25 | 国电南瑞科技股份有限公司 | Three-machine excitation single-phase rectification excitation loop and follow current resistance model selection method |
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