CN107767978A - A kind of nuclear plant safety stably cuts wheel secondary control method - Google Patents
A kind of nuclear plant safety stably cuts wheel secondary control method Download PDFInfo
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- CN107767978A CN107767978A CN201710814206.1A CN201710814206A CN107767978A CN 107767978 A CN107767978 A CN 107767978A CN 201710814206 A CN201710814206 A CN 201710814206A CN 107767978 A CN107767978 A CN 107767978A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to million kilowatt nuclear power station security control field, there is provided a kind of nuclear plant safety stably cuts wheel secondary control method, and methods described includes：The output power performance of nuclear power generating sets is measured, and according to each nuclear power generating sets actual motion state in the output power performance monitoring nuclear power station；The cost reloaded according to the phase in longevity of the nuclear power generating sets fuel and nuclear reactor, set that each nuclear power generating sets in nuclear power station cut machine cuts the preferential round table of machine；Corresponding nuclear power generating sets are carried out to cut machine operation according to each nuclear power generating sets actual motion state, and according to the preferential round table of machine of cutting.The present invention employs the preferential round table of the machine of cutting in different nuclear power generating sets running statuses, and specify that nuclear power station unit station cuts machine priority rule, reduces electric energy loss of the nuclear power generating sets in machine operation is cut, and improves the stability of nuclear power Force system.
Description
Technical field
The invention belongs to million kilowatt nuclear power station security control field, more particularly to a kind of nuclear plant safety stably to cut machine
Round control method.
Background technology
Nuclear plant safety is always the important focus of attention of current nuclear power field, because nuclear power station produces during generating
Raw substantial amounts of radioactive substance, if nuclear power station breaks down in the process of running, these radioactive particulates once enter extraneous
Environment, it will very serious destruction, such as Japanese Fukushima nuclear power plant accident are caused for whole to the life security of the mankind
The ecology of East Asia Region all causes larger baneful influence.Therefore, nuclear plant safety stability contorting has become current nuclear power
Most important research direction in Force system.
When nuclear power station internal fault occurs in the process of running, nuclear power station mainly controls unit by cutting machine operation
Stalling, the reactor shut-down of incident area is outwards powered by the core unit of normal work, in the process, starts nuclear power
Self overhaul procedure of station failure, until threatening the factor of nuclear plant safety operation to be eliminated, nuclear power station is just powered with all strength；Work as nuclear power
The external load too high of transmission line of electricity of standing, nuclear power station by cutting machine operation limitation power output, prevent in nuclear power station element due to
Current overload and there is excessive heating phenomenon, cause other even more serious accidents.
But existing nuclear power station safety full control method is clearly present problems with：1st, for the running status of nuclear power generating sets
Do not do careful differentiation, be only divided into malfunction and normal condition, and the nuclear power generating sets failure in reality can be subdivided into it is more
Class, and prior art does not have definite rule to weigh the running status of nuclear power generating sets, to various nuclear power generating sets failure modes
It can not clearly be defined and easily cause erroneous judgement；2nd, in nuclear power generating sets failure is handled, art methods are not clear and definite
Machine rule is cut, easily causes to cut by mistake, or even during nuclear power station normal work, also occurs and cuts machine operation, reduce core
The generating efficiency in power station, cause larger electric energy loss.
The content of the invention
The present invention provides a kind of nuclear plant safety and stably cuts wheel secondary control method, it is intended to solves nuclear power machine in the prior art
Group cut machine rule it is indefinite caused by electric energy loss it is excessive the problem of.
The present invention provides a kind of nuclear plant safety and stably cuts wheel secondary control method, comprises the following steps：
The output power performance of nuclear power generating sets is measured, and according to each nuclear power machine in the output power performance monitoring nuclear power station
Group actual motion state；
The cost reloaded according to the phase in longevity of the nuclear power generating sets fuel and nuclear reactor, set each nuclear power machine in nuclear power station
What group cut machine cuts the preferential round table of machine；
Corresponding nuclear power generating sets are entered according to each nuclear power generating sets actual motion state, and according to the preferential round table of machine of cutting
Row cuts machine operation.
In the present invention, according to every measurable index in nuclear power generating sets, such as electric current, voltage, power, nuclear power machine is judged
The residing running status of group, the cost reloaded according to the phase in longevity of the nuclear power generating sets fuel and nuclear reactor, set nuclear power station
In each nuclear power generating sets cut machine cut the preferential round table of machine, so as to specify that nuclear power station unit station cuts the rule of machine, for each
Nuclear power generating sets under kind running status perform orderly machine of cutting and operated, and reduce electric energy of the nuclear power generating sets during handling failure
Loss, so as to ensure that the stabilization of nuclear power generating sets transmission system.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those skilled in the art, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is the implementation process that a kind of nuclear plant safety provided in an embodiment of the present invention stably cuts wheel secondary control method
Figure；
Fig. 2 is nuclear power generating sets actual motion condition monitoring schematic diagram provided in an embodiment of the present invention；
Fig. 3 is provided in an embodiment of the present invention when nuclear power generating sets are in overlond running state, and nuclear plant safety is stably cut
The particular flow sheet of wheel secondary control method.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows that a kind of nuclear plant safety provided in an embodiment of the present invention stably cuts the realization stream of wheel secondary control method
Journey, for convenience of description, the part related to the embodiment of the present invention is illustrate only, details are as follows：
Step S101:The output power performance of nuclear power generating sets is measured, and according to the output power performance monitoring nuclear power station
In each nuclear power generating sets actual motion state；
With reference to the nuclear power generating sets actual motion condition monitoring figure in Fig. 2, the electrical performance of nuclear power generating sets input can be more
It is individual：Electrical performance 1, electrical performance 2 ... electrical performance N, wherein N are the positive integer more than or equal to 1, pass through the items electricity of input
Power performance meets corresponding conditionses, can determine whether out the state of nuclear power generating sets actual motion：State 1, state 2 ... state N, wherein N are
Positive integer more than or equal to 1；In actual application, the electrical performance of input can be voltage, electric current, circuit breaker position
Signal etc., the actual state of corresponding nuclear power generating sets can be：Stoppage in transit state, normal operation, operation exception state etc., operation are different
Normal state includes：Overlond running state, N-2 failures etc..
Embodiment one：Wherein described electrical performance is active power of output and output current, by measuring nuclear power generating sets
Active power of output and output current, and nuclear power generating sets actual motion is monitored according to the active power of output and output current
State；
If the active power of output meets following condition：
|P-0.2s|≥Ps1, | Pt|≤Ps2And I≤IS
Wherein, | P-0.2s| the active power exported for the nuclear power generating sets before acting 0.2 second, | Pt| it is the nuclear power
The active power that unit exports in action, wherein " action 0.2 second before " refer to selection monitoring 0.2 second time point it
Before, such as 8：The active power of output of nuclear power generating sets is monitored when 00 | Pt|=100KW, and | P-0.2s| it is 7：Monitored when 58
Obtain the active power of output of nuclear power generating sets | P-0.2s|=120KW；
Ps1And Ps2For the power output set in advance, I is nuclear power generating sets output current in action, ISFor the core
Group of motors maximum output voltage under normal operating conditions；
Meanwhile the nuclear power generating sets output current meets following condition：
And t >=ts1
Wherein IkFor output current of the nuclear power generating sets in action, Ik-24It is the nuclear power generating sets 24 before action
The output current of second, UNFor the rated output voltage of the nuclear power generating sets, Ps1And Ps2For the power output set in advance, t is institute
State the delay time of nuclear power generating sets output current in action, ts1For the nuclear power generating sets, output current is prolonged in normal state
When the time, α and β are the intrinsic coefficient of the nuclear power generating sets, | Δ I |dtThe current floating threshold value set in advance for nuclear power generating sets；
Then there is normal trip phenomenon or the phenomenon that normally has a power failure in the nuclear power generating sets, then need not carry out cutting machine operation.
Embodiment two：Wherein described electrical performance is active power of output and output current, by measuring nuclear power generating sets
Active power of output and output current, and nuclear power generating sets actual motion is monitored according to the active power of output and output current
State；
If the nuclear power generating sets output current meets following condition：
I≥ISET
Wherein I be the nuclear power generating sets actual output current, ISETFor the output-current rating of the nuclear power generating sets；
And the active power of output of the nuclear power generating sets meets following condition：
P≥PSET
Wherein P is the actual power output of the nuclear power generating sets, PSETFor the specified output wattful power of the nuclear power generating sets
Rate；
The delay time of the nuclear power generating sets output current is more than or equal to 1 second simultaneously；
Then the nuclear power generating sets are in overlond running state.
Embodiment three：Wherein described electrical performance is output voltage and output current, by measuring the defeated of nuclear power generating sets
Go out voltage and output current, and nuclear power generating sets actual motion state is monitored according to the output voltage and output current；
If the output voltage of the nuclear power generating sets meets following condition：
U>US2；
Wherein U be the nuclear power generating sets actual output voltage, US2It is in for the nuclear power generating sets under normal operating condition
Output voltage；
Any biphase current be present in the three-phase current of output simultaneously and meet following condition：
I>Igz；
Wherein I be the nuclear power generating sets actual output current, IgzIt is in for the nuclear power generating sets under normal operating condition
Output current；
And the actuation time of the nuclear power generating sets meets following condition：
t>tgz；
Wherein t be the nuclear power generating sets the actual act time, tgzFor the nuclear power generating sets actuation time threshold set in advance；
Wherein actuation time refers to that the output voltage of nuclear power generating sets and output three-phase current all meet above-mentioned condition, nuclear power machine
The time of group actual motion；
Then the nuclear power generating sets are in overlond running state.
For example service condition 1 be present：The actual output voltage U=100KV of the nuclear power generating sets, at the nuclear power generating sets
Output voltage U under normal operating conditionS2=90KV；The actual output current of nuclear power generating sets is I=100A, the nuclear power machine
The output current I that group is under normal operating conditiongz=90A；
And the nuclear power generating sets are in the time t=3S of the actual motion of service condition 1, the actuation time door of the nuclear power station
Threshold value tgz=5S, because nuclear power station is shorter than action threshold value in the time of 1 time actual motion of service condition, therefore situation is planted with regard to nothing
Method judges whether the nuclear power generating sets are in overlond running state, and the only actual act time of nuclear power generating sets is more than nuclear power machine
It can just judge whether the nuclear power generating sets are in overlond running state during group actuation time threshold value.
Example IV：Wherein described electrical performance is the generator rotor angle of nuclear power generating sets, by measuring the generator rotor angle of nuclear power generating sets, and
Nuclear power generating sets actual motion state is monitored according to the power-angle curve of nuclear power generating sets；
If attenuation trend is presented in the power-angle curve of nuclear power generating sets, the nuclear power generating sets occur N-2 failures, then needed to this
Nuclear power generating sets carry out cutting machine operation；
Wherein described generator rotor angle refers to the phase angle between the excitation electric gesture of nuclear power generating sets and the three-phase voltage of output, institute
State power-angle curve and refer to relation curve between generator rotor angle and the active power of output.
Embodiment five：Wherein described electrical performance is the active power of output and output current calculated value of nuclear power generating sets,
Due to during circuit counting, generally requiring to set reference direction, thus by the electric current that is calculated with positive sign "+" or
Negative sign "-", its meaning only represent whether the direction of actual current and reference direction are identical, and wherein Current calculation value refers to not consider
The amplitude of the reference direction of electric current, only electric current；By measuring the active power of output and output current calculated value of nuclear power generating sets,
And nuclear power generating sets actual motion state is monitored according to the active power of output and output current calculated value of nuclear power generating sets；
If meet following condition：
|P|>PT and | I |>IT
Wherein, | P | it is the active power of output of the nuclear power generating sets, PT is that the nuclear power generating sets are in normal operating condition
Under required minimum active power of output, and PT is sets in advance, | I | be the output current calculated value of the nuclear power generating sets,
IT is the minimum output current calculated value needed for the nuclear power generating sets are under normal operating condition, and IT is to set in advance；
Then the nuclear power generating sets are in normal operating condition, then the nuclear power generating sets need not be carried out cutting machine operation；
If meet following condition：
| P |≤0.95 × PT and | I |≤0.95 × IT
Then the nuclear power generating sets are in stoppage in transit state；
If the active power of output and output current calculated value of the nuclear power generating sets are to the normal running (operation) conditions and described
Stoppage in transit condition is all unsatisfactory for；
Then the nuclear power generating sets are in operation exception state, and the operation exception state includes：Overload, N-2 failures etc.,
If N-2 failures occur for nuclear power generating sets, need that the nuclear power generating sets are carried out to cut machine operation.If it need to further segment nuclear power generating sets
Abnormality, then the electrical performance again according to input is needed to be judged.
Embodiment six：As a kind of mode of possible implementation, wherein described electrical performance is interrupted for the nuclear power generating sets
Road device position signalling, the breaker can close, carry and cut-off the electric current in nuclear power generating sets transmission line of electricity；Including：
Breaker position signalling is obtained in the nuclear power generating sets to monitor nuclear power generating sets actual motion state；
If breaker position signalling is closure in the nuclear power generating sets, the nuclear power generating sets are in normal operating condition,
Then the nuclear power generating sets need not be carried out to cut machine operation；
If breaker position signalling is disconnects in the nuclear power generating sets, and meets following condition, then the nuclear power generating sets
In stoppage in transit state；Otherwise the nuclear power generating sets are in operation exception state, and described condition is：
| P |≤0.95 × PT and | I |≤0.95 × IT
Wherein | P | it is the active power of output of the nuclear power generating sets, PT is that the nuclear power generating sets are in normal operating condition
Under required minimum active power of output, and PT is sets in advance, | I | be the output current calculated value of the nuclear power generating sets,
IT is the minimum output current calculated value needed for the nuclear power generating sets are under normal operating condition, and IT is to set in advance.
The operation exception state includes：Overload, N-2 failures etc., if N-2 failures occur for nuclear power generating sets, need pair
The nuclear power generating sets carry out cutting machine operation.
Embodiment seven：Wherein described electrical performance is output current frequency and output voltage, by measuring nuclear power generating sets
Output current frequency and output voltage, and nuclear power generating sets actual motion is monitored according to the output current frequency and output voltage
State；
If the output current frequency that the nuclear power generating sets have more than two-way all meets following condition：
f≤fs；
Wherein f be the nuclear power generating sets actual output current frequency, fsFor the rated output frequency of the nuclear power generating sets
Rate；
And the output voltage of the nuclear power generating sets meets following condition：
U≤Us；
Wherein U be the nuclear power generating sets actual output voltage, UsElectricity is exported under normal circumstances for the nuclear power generating sets
Pressure value；
Then the nuclear power generating sets are in low-frequency operation state, then need that the nuclear power generating sets are carried out to cut machine operation.
By measuring specific electrical performance, including electric current, voltage etc., by judging that electrical performance meets correlated condition,
So as to accurately judge the running status residing for nuclear power generating sets, this nuclear power generating sets operation monitor mode has strictly distinguished nuclear power generating sets
Various malfunctions, overcome and the defects of erroneous judgement easily occur to the actual motion state of nuclear power generating sets in the prior art, carry
The high troubleshooting capability of nuclear power generating sets.
Step S102:The cost reloaded according to the phase in longevity of the nuclear power generating sets fuel and nuclear reactor, set in nuclear power station
What each nuclear power generating sets cut machine cuts the preferential round table of machine；
Specifically, nuclear power generating sets are in actual moving process, due to the generated output of each nuclear power generating sets, construction-time and
The maintenance frequency of material and each nuclear power generating sets differs, therefore each nuclear power generating sets fuel service condition is also to differ,
For example the fuel of some nuclear power generating sets is due to just changing and the power output of the unit is relatively low, then phase in longevity of this fuel
It is long；If opposite nuclear power generating sets transmitted power is big, the nuclear power fuel consumed is more, then this nuclear power generating sets fuel just compared with
It is short；
Similarly, each nuclear power generating sets center reactor refuling process is complex, contains numerous processing steps, and often
Secondary operation of reloading is likely to cause the transmission line of electricity of nuclear power generating sets certain damage, because the construction of each nuclear power generating sets is deposited
In difference, different nuclear power generating sets carry out the cost that nuclear reactor reloads and are also just not quite similar；
Choose most important two parameters of each nuclear power generating sets：The cost that the phase in longevity of fuel and nuclear reactor reload, according to
The two parameters determine the wheel of cutting of each nuclear power generating sets, and the preferential round table of machine is cut in formation, whenever nuclear power generating sets carry out cutting machine
During operation, machine order is cut according to the unit in the preferential round table of machine of cutting, corresponding nuclear power generating sets are carried out to cut machine operation；By setting
Surely cut the preferential round table of machine specify that nuclear power generating sets cut machine rule, avoid and cut operation by mistake.
Certainly, also include as a kind of embodiment of relatively optimization, the described preferential round table of machine of cutting：
What is cut off every time is that minimum unit is influenceed on nuclear power substation stability of power system, and in each nuclear power substation extremely
Retain a nuclear power generating sets operation less.
It is wherein described that the minimum nuclear power generating sets power output that specifically refers to is influenceed on stability of power system in nuclear power substation
Middle proportion is minimum, for example there are 4 units nuclear power substation：No. 1 unit, No. 2 units, No. 3 units, No. 4 units, wherein each
The power output of nuclear power generating sets is：
P1=100KW
P2=150KW
P3=120KW
P4=80KW
Then above-mentioned 4 unit power outputs are followed successively by from low to high：No. 4 units, No. 1 unit, No. 3 units, No. 2 units,
Accordingly, nuclear power generating sets are successively from low to high on the influence of nuclear power substation stability of power system：No. 4 units, No. 1 unit, No. 3
Unit, No. 2 units, therefore machine order is cut in the preferential round table of machine of cutting, cut off to nuclear power substation stability of power system
Minimum unit is influenceed, No. 4 units should be cut off first.
Step S103:According to each nuclear power generating sets actual motion state, and according to the preferential round table of machine of cutting to corresponding
Nuclear power generating sets carry out cutting machine operation.
Specifically, when N-2 failures occur for nuclear power generating sets, then to cutting machine operation described in nuclear power generating sets execution, its institute is reduced
Nuclear power substation power output.
Further, when N-2 failures occur for nuclear power generating sets, the nuclear power substation operated by cutting machine where reducing it exports
Power, the calculation formula of wherein power output decrement are：
Dg=(PD-PS)×KL
Wherein DgThe nuclear power substation needs the power output cut off, PDThe trend value of transmission line of electricity in the nuclear power substation；
PSFor the action trend value of transmission line of electricity in the nuclear power substation；KLFor the action factor of the nuclear power substation.
Specifically, when the nuclear power generating sets are in overlond running state, including with incision machine processing step：
Step A1, when any back transmission line meets following condition simultaneously in the nuclear power generating sets：
IB≥ISTART；
PB≥PSET；
tB≥tSET；
Wherein IBFor the actual current of transmission line of electricity, ISTARTFor the rated current of transmission line of electricity；PBFor the reality of nuclear power generating sets
Border power output, PSETFor the rated output power of nuclear power generating sets；tBFor the actual time delay time of running current on transmission line of electricity,
tSETFor nuclear power generating sets output current delay rated value；
Step A2, the preferential round table of machine is cut to cutting machine operation described in nuclear power generating sets execution according to described, and cut out every time
One nuclear power generating sets；
Step A3, rejudge the nuclear power generating sets transmission line of electricity whether and meanwhile meet condition described in step A1；If
Meet the condition then return to step A2, perform cut machine operation again；Otherwise, the nuclear power generating sets return to normal operating condition,
No longer perform and cut machine operation.
As a preferred embodiment, after cutting machine operation to nuclear power generating sets execution, machine operation is cut to institute in order to evaluate
The influence degree of the power system transient stability of nuclear power substation where stating nuclear power generating sets, setpoint power output Sudden Changing Rate Δ P, its
Formula is as follows：
Δ P=P1-P2
Wherein P1To take before cutting machine operation, the power output of nuclear power substation；P2After taking machine of cutting to operate, nuclear power
The power output of substation.Because the Sudden Changing Rate of power and the transient stability of power system have dull mathematical relationship, work as output
Chugging amount is bigger, then it represents that it is described cut machine operation nuclear power substation power system transient stability is influenceed it is bigger, and in reality
Border nuclear power generating sets are cut in machine operation, and should try one's best reduces the power output Sudden Changing Rate of nuclear power substation, to ensure the stabilization of nuclear power system
Property.
It is worth noting that, under the different running status of nuclear power generating sets, the running current on each item should also meet
Correlated condition, the condition include：
On the one hand, when judging the actual motion state of nuclear power generating sets, the operation electricity of each item in nuclear power generating sets
Stream should also meet correlated condition, and the condition is：
When the nuclear power generating sets are in normal operating condition, including：
The frequency of running current is in 49.2-50.5Hz in the nuclear power generating sets；
The running current of transmission line of electricity must not exceed the minimum value of the following element running current in the nuclear power generating sets：
The current-carrying capacity of transmission line of electricity when environment temperature is 35 DEG C, circuit disconnecting link rated current, a trap once
Rated current, a rated current of current transformer；
And the apparent energy of transformer station high-voltage side bus is no more than its rated power in the nuclear power generating sets；
When take cut machine measure after, certain fluctuation occurs in the running current of nuclear power generating sets, but as long as running current meet
Following condition, then nuclear power generating sets are also in normal operating condition, wherein described condition is：
The running current in single element in the nuclear power generating sets is no more than failure current limit value, and the running current
Amplitude fluctuations must not exceed 8%；
For example a resistance R1, resistance R1 failure current limit value i in nuclear power generating sets be present1Actual fortune on=50A, resistance R1
Row current average i2=30A, due to cutting the disturbance that brings of machine operation, there is certain ripple in the running current in nuclear power generating sets
It is dynamic, if the maximum of running current is i on resistance R1max=32A, the minimum value of running current is imin=28.5A, then operation is electric
The amplitude fluctuations of stream are：
And i2<i1, then the nuclear power generating sets be also in normal operating condition, it should be noted that the condition is only applicable to adopt
The nuclear power generating sets normal operating condition later with machine measure is cut
The maximum current value that wherein described failure current limit value can carry for the element, and the failure current limit value
Set in advance.
On the other hand, when judging that the nuclear power generating sets are in operation exception state, wherein the operation exception state bag
Include nuclear power generating sets and N-2 failures, overlond running etc. occurs, then the transmission line of electricity running current in nuclear power generating sets should meet following bar
Part：
Running current frequency is in the range of 47.5-51.5Hz in transmission line of electricity, and transmission line of electricity is under thermostabilization limit mode
Running current must not exceed the minimum values of following elements：
The specified cut-off current of transmission line of electricity, the specified cut-off current of trap, 1.2 times of current transformer rated current.
Wherein described thermostabilization limit mode refers to：Supertension line is because self-heating has a higher temperature, and one
As temperature up to 100 DEG C even 150 DEG C, the running current that wire is stablized at relatively high temperatures.
The electrical performance exported in the present embodiment by measuring nuclear power generating sets, so as to clearly distinguish nuclear power generating sets
Actual motion state, different nuclear power generating sets failures can be handled in time；The preferential round table of the machine of cutting has been concurrently set, specify that
Nuclear power generating sets cut machine rule, reduce because cut machine operation and caused by power consumption, improve nuclear power generating sets power output
Stability.
Fig. 3 shows provided in an embodiment of the present invention when nuclear power generating sets are in overlond running state, and nuclear plant safety is steady
Surely the particular flow sheet of wheel secondary control method is cut, details are as follows：
Step S301：The output power performance of nuclear power generating sets is measured, and nuclear power is judged according to the output power performance
Unit is in overlond running state；
Step S302：When the nuclear power generating sets are in overlond running state, it is necessary to determine whether nuclear power generating sets overload
Type：
If the transmission cross-section delivering power overload of the nuclear power generating sets, performs step S304；
Otherwise, step S303 is performed.
Step S303：Take cutting load to operate the nuclear power generating sets, then nuclear power generating sets need not be taken and cut machine operation.
Wherein cutting load refers to the use electric loading for cutting off the nuclear power generating sets power transmission line terminal, this overload fault type master
If being caused by the electricity consumption load too high of power transmission line terminal, specifically, user is concentrated use in high-power electricity in peak times of power consumption
Power product, often causes the overload operation of power system, and what such case only needed to reduce power transmission line terminal uses electric loading
；
Wherein transmission cross-section delivering power refer on power grid security or electricity transaction on be mutually related one group of power transmission line
The general power exported outside road direction.
Step S304:Take nuclear power generating sets the machine of cutting to operate, perform step S305.
Step S305：If nuclear power generating sets are taken described cut by the transmission cross-section delivering power overload of the nuclear power generating sets
Machine operates, and judges any back transmission line in the nuclear power generating sets while meets to cut machine condition, if meeting to cut machine condition, holds
Row step S307, otherwise, illustrate that the nuclear power generating sets have returned to normal operating condition, perform step S306.It is described to cut machine condition
For：
IB≥ISTART；
PB≥PSET；
tB≥tSET；
Wherein IBFor the actual current of transmission line of electricity, ISTARTFor the rated current of transmission line of electricity；PBFor the reality of nuclear power generating sets
Border power output, PSETFor the rated output power of nuclear power generating sets；tBFor the actual time delay time of running current on transmission line of electricity,
tSETFor nuclear power generating sets output current delay rated value；
Step S306：The nuclear power generating sets have returned to normal operating condition, and machine operation is cut in stopping.
Step S307：The cost reloaded according to the phase in longevity of the nuclear power generating sets fuel and nuclear reactor, sets each nuclear power
What unit cut machine cuts the preferential round table of machine.It should be noted that step 307 can be arranged on before step S301-S306
Carried out simultaneously between either or with one of step.
Step S308：The preferential round table of machine is cut to cutting machine operation described in nuclear power generating sets execution according to described, and is cut every time
Go out a nuclear power generating sets, be then back to step S305.
In the present embodiment, whether overloaded according to the transmission cross-section delivering power of nuclear power generating sets, segmented nuclear power generating sets mistake
The classification of carrying row, machine operation and the cutting load cut is taken respectively and is operated, overcomes and nuclear power station is overloaded in the prior art
The defects of malfunction is handled not in time, improve prevention and control ability of the nuclear power generating sets for overload.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (14)
1. a kind of nuclear plant safety stably cuts wheel secondary control method, it is characterised in that comprises the following steps：
The output power performance of nuclear power generating sets is measured, and it is real according to each nuclear power generating sets in the output power performance monitoring nuclear power station
Border running status；
The cost reloaded according to the phase in longevity of the nuclear power generating sets fuel and nuclear reactor, set each nuclear power generating sets in nuclear power station and enter
What row cut machine cuts the preferential round table of machine；
Corresponding nuclear power generating sets are cut according to each nuclear power generating sets actual motion state, and according to the preferential round table of machine of cutting
Machine operates.
2. according to the method for claim 1, it is characterised in that wherein described electrical performance is active power of output and defeated
Go out electric current, by measuring the active power of output and output current of nuclear power generating sets, and according to the active power of output and output
Current monitoring nuclear power generating sets actual motion state；
If the active power of output meets following condition：
|P-0.2s|≥Ps1, | Pt|≤Ps2And I≤IS
Wherein, | P-0.2s| the active power exported for the nuclear power generating sets before acting 0.2 second, | Pt| it is the nuclear power generating sets
The active power exported in action, Ps1And Ps2For the power output set in advance, I is that the nuclear power generating sets are defeated in action
Go out electric current, ISFor nuclear power generating sets maximum output voltage under normal operating conditions；
Meanwhile the nuclear power generating sets output current meets following condition：
And t >=ts1
Wherein IkFor output current of the nuclear power generating sets in action, Ik-24It is the nuclear power generating sets 24 seconds before action
Output current, UNFor the rated output voltage of the nuclear power generating sets, Ps1And Ps2For the power output set in advance, t is the core
The delay time of group of motors output current in action, ts1For the nuclear power generating sets in normal state the delay of output current when
Between, α and the intrinsic coefficient that β is the nuclear power generating sets, | Δ I |dtThe current floating threshold value set in advance for nuclear power generating sets；
Then there is normal trip phenomenon or the phenomenon that normally has a power failure in the nuclear power generating sets, then the nuclear power generating sets need not be cut
Machine operates.
3. according to the method for claim 1, it is characterised in that wherein described electrical performance is active power of output and defeated
Go out electric current, by measuring the active power of output and output current of nuclear power generating sets, and according to the active power of output and output
Current monitoring nuclear power generating sets actual motion state；
If the nuclear power generating sets output current meets following condition：
I≥ISET
Wherein I be the nuclear power generating sets actual output current, ISETFor the output-current rating of the nuclear power generating sets；
And the active power of output of the nuclear power generating sets meets following condition：
P≥PSET
Wherein P is the actual power output of the nuclear power generating sets, PSETFor the specified active power of output of the nuclear power generating sets；
The delay time of the nuclear power generating sets output current is more than or equal to 1 second simultaneously；
Then the nuclear power generating sets are in overlond running state.
4. according to the method for claim 1, it is characterised in that wherein described electrical performance is output voltage and output electricity
Stream, nuclear power is monitored by measuring the output voltage and output current of nuclear power generating sets, and according to the output voltage and output current
Unit actual motion state；
If the output voltage of the nuclear power generating sets meets following condition：
U>US2；
Wherein U be the nuclear power generating sets actual output voltage, US2It is in defeated under normal operating condition for the nuclear power generating sets
Go out voltage；
Any biphase current be present in the three-phase current of output simultaneously and meet following condition：
I>Igz；
Wherein I be the nuclear power generating sets actual output current, IgzIt is in defeated under normal operating condition for the nuclear power generating sets
Go out electric current；
And the actuation time of the nuclear power generating sets meets following condition：
t>tgz；
Wherein t be the nuclear power generating sets the actual act time, tgzFor the nuclear power generating sets actuation time threshold set in advance；
Then the nuclear power generating sets are in overlond running state.
5. according to the method for claim 1, it is characterised in that wherein described electrical performance is the generator rotor angle of nuclear power generating sets,
Nuclear power generating sets actual motion state is monitored by measuring the generator rotor angle of nuclear power generating sets, and according to the power-angle curve of nuclear power generating sets；
If attenuation trend is presented in the power-angle curve of nuclear power generating sets, N-2 failures occur for the nuclear power generating sets；
Wherein described generator rotor angle refers to the phase angle between the excitation electric gesture of nuclear power generating sets and the three-phase voltage of output, the work(
Angular curve refers to the relation curve between generator rotor angle and the active power of output.
6. according to the method for claim 1, it is characterised in that wherein described electrical performance has for the output of nuclear power generating sets
Work(power and output current calculated value, by measuring the active power of output and output current calculated value of nuclear power generating sets, and according to
Active power of output and output current calculated value the monitoring nuclear power generating sets actual motion state of nuclear power generating sets；
If meet following condition：
|P|>PT and | I |>IT
Wherein, | P | it is the active power of output of the nuclear power generating sets, PT is in institute under normal operating condition for the nuclear power generating sets
The minimum active power of output needed, and PT is to set in advance, | I | it is the output current calculated value of the nuclear power generating sets, IT is
The nuclear power generating sets are in minimum output current calculated value required under normal operating condition, and IT is to set in advance；
Then the nuclear power generating sets are in normal operating condition, then the nuclear power generating sets need not be carried out cutting machine operation；
If meet following condition：
| P |≤0.95 × PT and | I |≤0.95 × IT
Then the nuclear power generating sets are in stoppage in transit state；
If the active power of output and output current calculated value of the nuclear power generating sets are to the normal running (operation) conditions and the stoppage in transit
Condition is all unsatisfactory for；
Then the nuclear power generating sets are in operation exception state.
7. according to the method for claim 1, it is characterised in that also include：
Breaker position signalling is obtained in the nuclear power generating sets to monitor nuclear power generating sets actual motion state；
If breaker position signalling is closure in the nuclear power generating sets, the nuclear power generating sets are in normal operating condition, then not
Need that the nuclear power generating sets are carried out to cut machine operation；
If breaker position signalling is disconnects in the nuclear power generating sets, and meets following condition, then the nuclear power generating sets are in
Stoppage in transit state, then the nuclear power generating sets need not be carried out cutting machine operation；Otherwise the nuclear power generating sets are in operation exception state, institute
The condition stated is：
| P |≤0.95 × PT and | I |≤0.95 × IT
Wherein | P | it is the active power of output of the nuclear power generating sets, PT is in institute under normal operating condition for the nuclear power generating sets
The minimum active power of output needed, and PT is to set in advance, | I | it is the output current calculated value of the nuclear power generating sets, IT is
The nuclear power generating sets are in minimum output current calculated value required under normal operating condition, and IT is to set in advance.
8. according to the method for claim 1, it is characterised in that the preferential round table of machine of cutting also includes：
What is cut off every time is that minimum unit is influenceed on nuclear power substation stability of power system, and is at least protected in each nuclear power substation
Stay a nuclear power generating sets operation.
9. according to the method for claim 1, it is characterised in that the nuclear power generating sets are in normal operating condition, including：
The frequency of running current is in 49.2-50.5Hz in the nuclear power generating sets；
The running current of transmission line of electricity must not exceed the minimum value of the following element running current in the nuclear power generating sets：
Environment temperature be 35 DEG C when the current-carrying capacity of transmission line of electricity, a rated current of circuit disconnecting link, trap it is once specified
Rated current of electric current, current transformer；
And the apparent energy of transformer station high-voltage side bus is no more than its rated power in the nuclear power generating sets；
When take cut machine measure after, the running current in single element in the nuclear power generating sets is no more than failure current limit value, and
And the amplitude fluctuations of the running current must not exceed 8%；
The maximum current value that wherein described failure current limit value can carry for the element, and the failure current limit value shifts to an earlier date
Setting.
10. according to the method for claim 1, it is characterised in that the nuclear power generating sets are in operation exception state, including：
Running current frequency is in the range of 47.5-51.5Hz in transmission line of electricity, fortune of the transmission line of electricity under thermostabilization limit mode
Row electric current must not exceed the minimum value of following elements：
The specified cut-off current of transmission line of electricity, the specified cut-off current of trap, 1.2 times of current transformer rated current.
11. according to the method for claim 1, it is characterised in that also include,
When N-2 failures occur for nuclear power generating sets, then to cutting machine operation described in nuclear power generating sets execution, the nuclear power substation where it is reduced
Power output.
12. according to the method for claim 11, it is characterised in that when N-2 failures occur for nuclear power generating sets, the core where it
The calculation formula of electronic station power output decrement is：
Dg=(PD-PS)×KL
Wherein DgThe nuclear power substation needs the power output cut off, PDThe trend value of transmission line of electricity in the nuclear power substation；PSFor
The action trend value of transmission line of electricity in the nuclear power substation；KLFor the action factor of the nuclear power substation.
13. according to the method described in claim 1,3,4,6 or 7, it is characterised in that be in carrying when the nuclear power generating sets
Row state；
If the transmission cross-section delivering power overload of the nuclear power generating sets, the machine of cutting is taken nuclear power generating sets to operate；
Otherwise, cutting load is taken to operate the nuclear power generating sets.
14. according to the method for claim 13, it is characterised in that overlond running state is in when the nuclear power generating sets,
Then include following overload processing step：
Step A1, when any back transmission line meets following condition simultaneously in the nuclear power generating sets：
IB≥ISTART；
PB≥PSET；
tB≥tSET；
Wherein IBFor the actual current of transmission line of electricity, ISTARTFor the rated current of transmission line of electricity；PBFor the reality output of nuclear power generating sets
Power, PSETFor the rated output power of nuclear power generating sets；tBFor the actual time delay time of running current on transmission line of electricity, tSETFor core
Group of motors output current delay rated value；
Step A2, the preferential round table of machine is cut to cutting machine operation described in nuclear power generating sets execution according to described, and cut out one every time
Nuclear power generating sets；
Step A3, rejudge the nuclear power generating sets transmission line of electricity whether and meanwhile meet condition described in step A1；If meet
Then machine operation is cut in return to step A2, again execution to the condition；Otherwise, the nuclear power generating sets return to normal operating condition, no longer
Machine operation is cut in execution.
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| JPH10326112A (en) * | 1997-05-27 | 1998-12-08 | Mitsubishi Heavy Ind Ltd | Plant operation controller |
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| JPH10326112A (en) * | 1997-05-27 | 1998-12-08 | Mitsubishi Heavy Ind Ltd | Plant operation controller |
| CN101740153A (en) * | 2009-12-01 | 2010-06-16 | 中国广东核电集团有限公司 | Device and system for monitoring and displaying normal operating condition of unit of nuclear power plant |
| CN102820069A (en) * | 2011-06-10 | 2012-12-12 | 中广核工程有限公司 | Nuclear power station unit control method and system |
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