CN107767978B - A kind of nuclear plant safety is stable to cut wheel secondary control method - Google Patents
A kind of nuclear plant safety is stable to cut wheel secondary control method Download PDFInfo
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- CN107767978B CN107767978B CN201710814206.1A CN201710814206A CN107767978B CN 107767978 B CN107767978 B CN 107767978B CN 201710814206 A CN201710814206 A CN 201710814206A CN 107767978 B CN107767978 B CN 107767978B
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to million kilowatt nuclear power station security control fields, it provides a kind of nuclear plant safety stabilization and cuts wheel secondary control method, the described method includes: the output power performance of measurement nuclear power unit, and according to nuclear power unit actual motion state each in the output power performance monitoring nuclear power station；The cost reloaded according to the phase in longevity of the nuclear power unit fuel and nuclear reactor, set that each nuclear power unit in nuclear power station cut machine cuts the preferential round table of machine；Corresponding nuclear power unit is carried out to cut machine operation according to each nuclear power unit actual motion state, and according to the preferential round table of machine of cutting.The present invention uses in different nuclear power unit operating statuses and cuts the preferential round table of machine, and specify nuclear power station unit station cuts machine priority rule, reduces nuclear power unit and is cutting the electric energy loss in machine operation, improves the stability of nuclear power Force system.
Description
Technical field
The invention belongs to million kilowatt nuclear power station security control fields more particularly to a kind of nuclear plant safety stabilization to cut machine
Round control method.
Background technique
Nuclear plant safety is always the important focus of attention of current nuclear power field, since nuclear power station produces during power generation
Raw a large amount of radioactive substance, if nuclear power station breaks down in the process of running, these radioactive particulates once enter extraneous
Environment, it will cause destruction very serious, such as Japanese Fukushima nuclear power plant accident for entire the life security of the mankind
The ecology of East Asia Region all causes biggish 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 powered outward by the core unit worked normally, 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 output power, 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 following problems: 1, for the operating status of nuclear power unit
Do not do careful differentiation, be only divided into malfunction and normal condition, and the nuclear power unit failure in reality can be subdivided into it is more
Class, and the prior art does not have exact rule to measure the operating status of nuclear power unit, to various nuclear power unit failure modes
It can not clearly be defined and be easy to cause erroneous judgement；2, in processing nuclear power unit failure, art methods are not specific
Machine rule is cut, is easy to cause and accidentally cuts, or even during nuclear power station works normally, also will appear and cut machine operation, reduce core
The generating efficiency in power station causes biggish electric energy loss.
Summary of the invention
The present invention provides a kind of nuclear plant safety stabilization and cuts wheel secondary control method, it is intended to solve nuclear power machine in the prior art
Group cuts the excessive problem of the indefinite caused electric energy loss of machine rule.
The present invention provides a kind of nuclear plant safety stabilization and cuts wheel secondary control method, comprising the following steps:
The output power performance of nuclear power unit is measured, and according to nuclear power machine each in the output power performance monitoring nuclear power station
Group actual motion state；
According to the cost that the phase in longevity of the nuclear power unit fuel and nuclear reactor reload, each nuclear power machine in nuclear power station is set
What group cut machine cuts the preferential round table of machine；
According to each nuclear power unit actual motion state, and according to it is described cut the preferential round table of machine to corresponding nuclear power unit into
Row cuts machine operation.
In the present invention, nuclear power machine is judged such as electric current, voltage, power according to measurable index every in nuclear power unit
The locating operating status of group sets nuclear power station according to the cost that the phase in longevity of the nuclear power unit fuel and nuclear reactor reload
In each nuclear power unit cut machine cut the preferential round table of machine, to specify that nuclear power station unit station cuts the rule of machine, for each
Nuclear power unit under kind operating status executes orderly machine of cutting and operates, and reduces electric energy of nuclear power unit during handling failure
Loss, to ensure that the stabilization of nuclear power unit transmission system.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is that a kind of nuclear plant safety provided in an embodiment of the present invention stablizes the implementation process for cutting wheel secondary control method
Figure；
Fig. 2 is nuclear power unit 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 unit is in overlond running state, and nuclear plant safety stabilization is cut
The specific flow chart of wheel secondary control method.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
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 a kind of nuclear plant safety provided in an embodiment of the present invention and stablizes the realization stream for cutting wheel secondary control method
Journey, for ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
Step S101: the output power performance of nuclear power unit is measured, and according to the output power performance monitoring nuclear power station
In each nuclear power unit actual motion state；
In conjunction with the nuclear power unit actual motion condition monitoring figure in Fig. 2, the electrical performance of nuclear power unit input can be more
A: electrical performance 1, electrical performance 2 ... electrical performance N, wherein N is the positive integer more than or equal to 1, passes through the items electricity of input
Power performance meets corresponding conditions, can determine whether out the state of nuclear power unit actual motion: state 1, state 2 ... state N, and wherein N is
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 corresponding actual state of nuclear power unit may is that stoppage in transit state, normal operation, operation exception state etc., run different
Normal state includes: overlond running state, N-2 failure etc..
Embodiment one: wherein the electrical performance is active power of output and output electric current, by measuring nuclear power unit
Active power of output and output electric current, and according to the active power of output and output current monitoring nuclear power unit actual motion
State；
If the active power of output meets the following conditions:
|P-0.2s|≥Ps1, | Pt|≤Ps2And I≤IS
Wherein, | P-0.2s| it is the active power that the nuclear power unit exports before movement 0.2 second, | Pt| it is the nuclear power
The active power that unit exports in movement, wherein " movement 0.2 second before " refer to selection monitoring 0.2 second time point it
Before, for example, in 8:00 monitor nuclear power unit active power of output | Pt|=100KW, and | P-0.2s| it is in the monitoring in 7:58
Obtain the active power of output of nuclear power unit | P-0.2s|=120KW；
Ps1And Ps2For the output power being set in advance, I is that the nuclear power unit exports electric current, I in movementSFor the core
Motor group maximum output current under normal operating conditions；
Meanwhile the nuclear power unit output electric current meets the following conditions:
And t >=ts1
Wherein IkFor output electric current of the nuclear power unit in movement, Ik-24It is the nuclear power unit 24 before movement
The output electric current of second, UNFor the rated output voltage of the nuclear power unit, Ps1And Ps2For the output power being set in advance, t is institute
State the delay time that nuclear power unit exports electric current in movement, ts1Prolonging for electric current is exported in normal state for the nuclear power unit
When the time, α and β are the intrinsic coefficient of the nuclear power unit, | Δ I |dtThe current floating threshold value being set in advance for nuclear power unit；
Then there is normal trip phenomenon or the phenomenon that normally has a power failure in the nuclear power unit, then does not need cut machine operation.
Embodiment two: wherein the electrical performance is active power of output and output electric current, by measuring nuclear power unit
Active power of output and output electric current, and according to the active power of output and output current monitoring nuclear power unit actual motion
State；
If the nuclear power unit output electric current meets the following conditions:
I≥ISET
Wherein I is the actual output current of the nuclear power unit, ISETFor the output-current rating of the nuclear power unit；
And the active power of output of the nuclear power unit meets the following conditions:
P≥PSET
Wherein P is the actual output power of the nuclear power unit, PSETFor the specified output wattful power of the nuclear power unit
Rate；
The delay time of the nuclear power unit output electric current is greater than or equal to 1 second simultaneously；
Then the nuclear power unit is in overlond running state.
Embodiment three: wherein the electrical performance is output voltage and output electric current, passes through the defeated of measurement nuclear power unit
Voltage and output electric current out, and according to the output voltage and output current monitoring nuclear power unit actual motion state；
If the output voltage of the nuclear power unit meets the following conditions:
U>US2；
Wherein U is the actual output voltage of the nuclear power unit, US2It is under normal operating condition for the nuclear power unit
Output voltage；
There are any biphase currents to meet the following conditions in the three-phase current of output simultaneously:
I>Igz；
Wherein I is the actual output current of the nuclear power unit, IgzIt is under normal operating condition for the nuclear power unit
Output electric current；
And the actuation time of the nuclear power unit meets the following conditions:
t>tgz；
Wherein t is the actual act time of the nuclear power unit, tgzFor the nuclear power unit actuation time threshold being set in advance；
Wherein actuation time refers to that the output voltage of nuclear power unit and output three-phase current all meet above-mentioned condition, nuclear power machine
The time of group actual motion；
Then the nuclear power unit is in overlond running state.
For example, there are service conditions 1: the actual output voltage U=100KV of the nuclear power unit, at the nuclear power unit
Output voltage U under normal operating conditionS2=90KV；The actual output current of nuclear power unit is I=100A, the nuclear power machine
Output electric current I of the group under normal operating conditiongz=90A；
And the nuclear power unit is in the time t=3S of 1 actual motion of service condition, the actuation time door of the nuclear power station
Threshold value tgz=5S, since the time of nuclear power station actual motion under service condition 1 shorter than acts threshold value, because such situation is with regard to nothing
Method judges whether the nuclear power unit is in overlond running state, and the only actual act time of nuclear power unit is greater than nuclear power machine
Group actuation time threshold value Shi Caineng judges whether the nuclear power unit is in overlond running state.
Example IV: wherein the electrical performance is the generator rotor angle of nuclear power unit, by measuring the generator rotor angle of nuclear power unit, and
Nuclear power unit actual motion state is monitored according to the power-angle curve of nuclear power unit；
If attenuation trend is presented in the power-angle curve of nuclear power unit, the nuclear power unit occurs N-2 failure, then needs to this
Nuclear power unit carries out cutting machine operation；
Wherein the generator rotor angle refers to the phase angle between the excitation electric gesture of nuclear power unit and the three-phase voltage of output, institute
It states power-angle curve and refers to relation curve between generator rotor angle and the active power of output.
Embodiment five: wherein the electrical performance is the active power of output and output electric current calculated value of nuclear power unit,
Due to during circuit counting, generally requiring setting reference direction, thus electric current obtained by calculation with positive sign "+" or
Negative sign "-", meaning only indicate whether the direction of actual current is identical as reference direction, and wherein electric current calculated value refers to and do not consider
The reference direction of electric current, the only amplitude of electric current；By measuring the active power of output and output electric current calculated value of nuclear power unit,
And nuclear power unit actual motion state is monitored according to the active power of output of nuclear power unit and output electric current calculated value；
If the following conditions are met:
| P | > PT and | I | > IT
Wherein, | P | it is the active power of output of the nuclear power unit, PT is that the nuclear power unit is in normal operating condition
Under required minimum active power of output, and PT is to be set in advance, | I | be the output electric current calculated value of the nuclear power unit,
IT is the minimum output current calculated value needed for the nuclear power unit is under normal operating condition, and IT is to be set in advance；
Then the nuclear power unit is in normal operating condition, then does not need to carry out cutting machine operation to the nuclear power unit；
If the following conditions are met:
| P |≤0.95 × PT and | I |≤0.95 × IT
Then the nuclear power unit is in stoppage in transit state；
If the active power of output of the nuclear power unit and output electric current calculated value are to the normal running (operation) conditions and described
Stoppage in transit condition is all unsatisfactory for；
Then the nuclear power unit is in operation exception state, which includes: overload, N-2 failure etc.,
If N-2 failure occurs for nuclear power unit, need to carry out the nuclear power unit to cut machine operation.If nuclear power unit need to be segmented further
Abnormality then needs the electrical performance again according to input to be judged.
Embodiment six: as a kind of mode of possible implementation, wherein the electrical performance is nuclear power unit interruption
Road device position signal, the breaker can close, carry and cut-off the electric current in nuclear power unit transmission line of electricity；Include:
Breaker position signal is obtained in the nuclear power unit to monitor nuclear power unit actual motion state；
If breaker position signal is closure in the nuclear power unit, the nuclear power unit is in normal operating condition,
It does not need then to carry out cutting machine operation to the nuclear power unit；
If breaker position signal is to disconnect, and meet the following conditions in the nuclear power unit, then the nuclear power unit
In stoppage in transit state；Otherwise the nuclear power unit is in operation exception state, the condition are as follows:
| P |≤0.95 × PT and | I |≤0.95 × IT
Wherein | P | it is the active power of output of the nuclear power unit, PT is that the nuclear power unit is in normal operating condition
Under required minimum active power of output, and PT is to be set in advance, | I | be the output electric current calculated value of the nuclear power unit,
IT is the minimum output current calculated value needed for the nuclear power unit is under normal operating condition, and IT is to be set in advance.
The operation exception state includes: overload, N-2 failure etc., if N-2 failure occurs for nuclear power unit, is needed pair
The nuclear power unit carries out cutting machine operation.
Embodiment seven: wherein the electrical performance is output current frequency and output voltage, by measuring nuclear power unit
Output current frequency and output voltage, and nuclear power unit actual motion is monitored according to the output current frequency and output voltage
State；
If there are output current frequencies more than two-way all to meet the following conditions for the nuclear power unit:
f≤fs；
Wherein f is the frequency of the actual output current of the nuclear power unit, fsFor the rated output frequency of the nuclear power unit
Rate；
And the output voltage of the nuclear power unit meets the following conditions:
U≤Us；
Wherein U is the actual output voltage of the nuclear power unit, UsElectricity is exported under normal circumstances for the nuclear power unit
Pressure value；
Then the nuclear power unit is in low-frequency operation state, then needs to carry out the nuclear power unit to cut machine operation.
By measuring specific electrical performance, including electric current, voltage etc., by judging that electrical performance meets correlated condition,
To accurately judge that operating status locating for nuclear power unit, this nuclear power unit operation monitor mode have strictly distinguished nuclear power unit
Various malfunctions, overcome the defect for being easy to appear erroneous judgement to the actual motion state of nuclear power unit in the prior art, mention
The high troubleshooting capability of nuclear power unit.
Step S102: the cost reloaded according to the phase in longevity of the nuclear power unit fuel and nuclear reactor is set in nuclear power station
What each nuclear power unit cut machine cuts the preferential round table of machine；
Specifically, nuclear power unit is in actual moving process, due to the generated output of each nuclear power unit, construction-time and
The maintenance frequency of material and each nuclear power unit is not identical, thus each nuclear power unit fuel service condition be also it is not identical,
For example, the fuel of some nuclear power units is due to just replacing and the output power of the unit is relatively low, then phase in longevity of this fuel
It is long；If opposite nuclear power unit transmission power is big, consumed nuclear power fuel is more, then this nuclear power unit fuel just compared with
It is short；
Similarly, each nuclear power unit center reactor refuling process is complex, contains numerous processing steps, and every
Secondary refueling operation is likely to cause the transmission line of electricity of nuclear power unit certain damage, since the construction of each nuclear power unit is deposited
In difference, different nuclear power units carry out the cost that nuclear reactor reloads and are also just not quite similar；
Choose most important two parameters of each nuclear power unit: 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 unit, and the preferential round table of machine is cut in formation, whenever nuclear power unit carries out cutting machine
When operation, machine sequence is cut according to the unit in the preferential round table of machine of cutting, corresponding nuclear power unit is carried out to cut machine operation；By setting
Surely cut the preferential round table of machine specify nuclear power unit cut machine rule, avoid and accidentally cut operation.
Certainly, the embodiment as a kind of relatively optimization, described cuts the preferential round table of machine further include:
What is cut off every time is to influence minimum unit to nuclear power substation stability of power system, and in each nuclear power substation extremely
Retain the nuclear power unit operation less.
The minimum nuclear power unit output power that specifically refers to is influenced in nuclear power substation on stability of power system described in wherein
Middle proportion is minimum, for example there are 4 units: No. 1 unit, No. 2 units, No. 3 units, No. 4 units in nuclear power substation, wherein each
The output power of nuclear power unit are as follows:
P1=100KW
P2=150KW
P3=120KW
P4=80KW
Then above-mentioned 4 unit output powers are from low to high successively are as follows: No. 4 units, No. 1 unit, No. 3 units, No. 2 units,
Correspondingly, nuclear power unit is 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 sequence is cut according in the preferential round table of machine of cutting, it cuts off to nuclear power substation stability of power system
Minimum unit is influenced, No. 4 units should be cut off first.
Step S103: according to each nuclear power unit actual motion state, and according to the preferential round table of machine of cutting to corresponding
Nuclear power unit carries out cutting machine operation.
Specifically, then to machine operation is cut described in nuclear power unit execution, reducing its institute when N-2 failure occurs for nuclear power unit
Nuclear power substation output power.
Further, it when N-2 failure occurs for nuclear power unit, is exported by cutting the nuclear power substation that machine operates where reducing it
Power, the wherein calculation formula of output power reduction amount are as follows:
Dg=(PD-PS)×KL
Wherein DgThe nuclear power substation needs the output power cut off, PDThe trend value of transmission line of electricity in the nuclear power substation；
PSFor the movement 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 unit is in overlond running state, including with incision machine processing step:
Step A1, when any back transmission line meets the following conditions simultaneously in the nuclear power unit:
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 unit
Border output power, PSETFor the rated output power of nuclear power unit；tBFor the actual time delay time of running current on transmission line of electricity,
tSETElectric current delay rated value is exported for nuclear power unit；
Step A2, according to it is described cut the preferential round table of machine to nuclear power unit execute described in cut machine operation, and cut out every time
One nuclear power unit；
Step A3, rejudge the nuclear power unit transmission line of electricity whether and meanwhile meet condition described in step A1；If
Meet the condition then return step A2, executes cut machine operation again；Otherwise, the nuclear power unit returns to normal operating condition,
It no longer executes and cuts machine operation.
As a preferred embodiment, cutting machine operation to institute to evaluate after cutting machine operation to nuclear power unit execution
The influence degree of the power system transient stability of nuclear power substation where stating nuclear power unit, setpoint power output Sudden Changing Rate Δ P,
Formula is as follows:
Δ P=P1-P2
Wherein P1To take before cutting machine operation, the output power of nuclear power substation；P2After taking machine of cutting to operate, nuclear power
The output power of substation.Since the Sudden Changing Rate of power and the transient stability of electric 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 influenced it is bigger, and in reality
Border nuclear power unit is cut in machine operation, should reduce the output power Sudden Changing Rate of nuclear power substation, as far as possible to ensure the stabilization of nuclear power system
Property.
It is worth noting that, the running current on each item should also meet under the different operating status of nuclear power unit
Correlated condition, the condition include:
On the one hand, when judging the actual motion state of nuclear power unit, the operation electricity of each item in nuclear power unit
Stream should also meet correlated condition, the condition are as follows:
When the nuclear power unit is in normal operating condition, comprising:
The frequency of running current is in 49.2-50.5Hz in the nuclear power unit；
The running current of transmission line of electricity must not exceed the minimum value of the following terms element running current in the nuclear power unit:
Environment temperature be 35 DEG C when the current-carrying capacity of transmission line of electricity, a rated current of route disconnecting link, trap it is primary
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 unit；
When take cut machine measure after, the running current of nuclear power unit will appear certain fluctuation, but as long as running current meet
The following conditions, then nuclear power unit is also in normal operating condition, wherein the condition are as follows:
The running current in single element in the nuclear power unit is no more than failure current limit value, and the running current
Amplitude fluctuations must not exceed 8%；
For example there are a resistance R1, the failure current limit value i of resistance R1 in nuclear power unit1Practical fortune on=50A, resistance R1
Row current average i2=30A, due to cutting machine operation bring disturbance, there are certain waves for the running current in nuclear power unit
It is dynamic, if the maximum value of running current is i on resistance R1max=32A, the minimum value of running current are imin=28.5A, then run electricity
The amplitude fluctuations of stream are as follows:
And i2<i1, then the nuclear power unit is also in normal operating condition, it should be noted that the condition is only applicable to adopt
With cutting the later nuclear power unit normal operating condition of machine measure
The wherein maximum current value that the failure current limit value can carry for the element, and the failure current limit value
It is set in advance.
On the other hand, when judging that the nuclear power unit is in operation exception state, wherein the operation exception state packet
It includes nuclear power unit and N-2 failure, overlond running etc. occurs, then the transmission line of electricity running current in nuclear power unit should meet following item
Part:
Running current frequency is within the scope 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 the thermostabilization limit mode refers to: supertension line is due to self-heating temperature with higher, and one
As temperature up to 100 DEG C even 150 DEG C, conducting wire stable running current at relatively high temperatures.
In the present embodiment by the electrical performance of measurement nuclear power unit output, to explicitly distinguish nuclear power unit
Actual motion state can handle different nuclear power unit failures in time；The preferential round table of the machine of cutting has been concurrently set, has been specified
Nuclear power unit cuts machine rule, reduces power consumption caused by due to cutting machine operation, improves nuclear power unit output power
Stability.
Fig. 3 shows provided in an embodiment of the present invention when nuclear power unit is in overlond running state, and nuclear plant safety is steady
Surely the specific flow chart of wheel secondary control method is cut, details are as follows:
Step S301: the output power performance of nuclear power unit 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 unit is in overlond running state, need further judge what nuclear power unit overloaded
Type:
If the transmission cross-section delivering power of the nuclear power unit overloads, S304 is thened follow the steps；
Otherwise, step S303 is executed.
Step S303: taking cutting load to operate the nuclear power unit, then does not need to take nuclear power unit and cut machine operation.
Wherein cutting load refers to the power load for cutting off the nuclear power unit power transmission line terminal, this overload fault type master
If being caused by the power load of power transmission line terminal is excessively high, specifically, user is concentrated use in high-power electricity in peak times of power consumption
Power product, often will lead to the overload operation of electric system, and such case only needs to reduce the power load of power transmission line terminal
?；
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: it takes the machine of cutting to operate nuclear power unit, executes step S305.
Step S305: if the transmission cross-section delivering power of the nuclear power unit overloads, described cut is taken to nuclear power unit
Machine operation judges any back transmission line in the nuclear power unit while satisfaction cuts machine condition, cuts machine condition if meeting, hold
Otherwise row step S307 illustrates that the nuclear power unit has returned to normal operating condition, executes step S306.It is described to cut machine condition
Are as follows:
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 unit
Border output power, PSETFor the rated output power of nuclear power unit；tBFor the actual time delay time of running current on transmission line of electricity,
tSETElectric current delay rated value is exported for nuclear power unit；
Step S306: the nuclear power unit has 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 unit 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 set before step S301-S306
Perhaps it is carried out simultaneously between or with one of step.
Step S308: according to it is described cut the preferential round table of machine to nuclear power unit execute described in cut machine operation, and cut every time
A nuclear power unit out, then return step S305.
In the present embodiment, whether overloaded according to the transmission cross-section delivering power of nuclear power unit, segmented nuclear power unit mistake
The classification of carrying row takes machine operation and the cutting load cut respectively and operates, overcomes and overload in the prior art to nuclear power station
The defect of malfunction processing not in time, improves nuclear power unit for the prevention and control ability of overload.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (14)
1. a kind of nuclear plant safety stabilization cuts wheel secondary control method, which comprises the following steps:
The output power performance of nuclear power unit is measured, and real according to nuclear power unit each in the output power performance monitoring nuclear power station
Border operating status；
Wherein, the electrical performance are as follows: active power of output, output electric current, output voltage, the generator rotor angle of nuclear power unit and nuclear power
Breaker position signal in unit；
The cost reloaded according to the phase in longevity of the nuclear power unit fuel and nuclear reactor, set in nuclear power station each nuclear power unit into
What row cut machine cuts the preferential round table of machine；
Corresponding nuclear power unit is cut according to each nuclear power unit actual motion state, and according to the preferential round table of machine of cutting
Machine operation.
2. the method according to claim 1, wherein wherein the electrical performance is active power of output and defeated
Electric current out, by measuring the active power of output and output electric current of nuclear power unit, and according to the active power of output and output
Current monitoring nuclear power unit actual motion state；
If the active power of output meets the following conditions:
|P-0.2s|≥Ps1, | Pt|≤Ps2And I≤IS
Wherein, | P-0.2s| it is the active power that the nuclear power unit exports before movement 0.2 second, | Pt| it is the nuclear power unit
The active power exported in movement, Ps1And Ps2For the output power being set in advance, I is that the nuclear power unit is defeated in movement
Electric current out, ISFor nuclear power unit maximum output current under normal operating conditions；
Meanwhile the nuclear power unit output electric current meets the following conditions:
And t >=ts1
Wherein IkFor output electric current of the nuclear power unit in movement, Ik-24It is the nuclear power unit 24 seconds before movement
Export electric current, UNFor the rated output voltage of the nuclear power unit, Ps1And Ps2For the output power being set in advance, t is the core
Motor group exports the delay time of electric current, t in movements1When exporting the delay of electric current in normal state for the nuclear power unit
Between, α and β are the intrinsic coefficient of the nuclear power unit, | Δ I |dtThe current floating threshold value being set in advance for nuclear power unit；
Then there is normal trip phenomenon or the phenomenon that normally has a power failure in the nuclear power unit, then does not need to cut the nuclear power unit
Machine operation.
3. the method according to claim 1, wherein wherein the electrical performance is active power of output and defeated
Electric current out, by measuring the active power of output and output electric current of nuclear power unit, and according to the active power of output and output
Current monitoring nuclear power unit actual motion state；
If the nuclear power unit output electric current meets the following conditions:
I≥ISET
Wherein I is the actual output current of the nuclear power unit, ISETFor the output-current rating of the nuclear power unit；
And the active power of output of the nuclear power unit meets the following conditions:
P≥PSET
Wherein P is the actual output power of the nuclear power unit, PSETFor the specified active power of output of the nuclear power unit；
The delay time of the nuclear power unit output electric current is greater than or equal to 1 second simultaneously；
Then the nuclear power unit is in overlond running state.
4. the method according to claim 1, wherein wherein the electrical performance is output voltage and output electricity
Stream, by measuring the output voltage and output electric current of nuclear power unit, and according to the output voltage and output current monitoring nuclear power
Unit actual motion state；
If the output voltage of the nuclear power unit meets the following conditions:
U>US2；
Wherein U is the actual output voltage of the nuclear power unit, US2It is in defeated under normal operating condition for the nuclear power unit
Voltage out；
There are any biphase currents to meet the following conditions in the three-phase current of output simultaneously:
I>Igz；
Wherein I is the actual output current of the nuclear power unit, IgzIt is in defeated under normal operating condition for the nuclear power unit
Electric current out；
And the actuation time of the nuclear power unit meets the following conditions:
t>tgz；
Wherein t is the actual act time of the nuclear power unit, tgzFor the nuclear power unit actuation time threshold being set in advance；
Then the nuclear power unit is in overlond running state.
5. the method according to claim 1, wherein wherein the electrical performance is the generator rotor angle of nuclear power unit,
Nuclear power unit actual motion state is monitored by measuring the generator rotor angle of nuclear power unit, and according to the power-angle curve of nuclear power unit；
If attenuation trend is presented in the power-angle curve of nuclear power unit, N-2 failure occurs for the nuclear power unit；
Wherein the generator rotor angle refers to the phase angle between the excitation electric gesture of nuclear power unit and the three-phase voltage of output, the function
Angular curve refers to the relation curve between generator rotor angle and the active power of output.
6. the method according to claim 1, wherein wherein the electrical performance is that the output of nuclear power unit has
Function power and output electric current calculated value, by measuring the active power of output of nuclear power unit and exporting electric current calculated value, and according to
The active power of output and output electric current calculated value of nuclear power unit monitor nuclear power unit actual motion state；
If the following conditions are met:
| P | > PT and | I | > IT
Wherein, | P | it is the active power of output of the nuclear power unit, PT is in institute under normal operating condition for the nuclear power unit
The minimum active power of output needed, and PT is to be set in advance, | I | it is the output electric current calculated value of the nuclear power unit, IT is
The nuclear power unit is in minimum output current calculated value required under normal operating condition, and IT is to be set in advance；
Then the nuclear power unit is in normal operating condition, then does not need to carry out cutting machine operation to the nuclear power unit；
If the following conditions are met:
| P |≤0.95 × PT and | I |≤0.95 × IT
Then the nuclear power unit is in stoppage in transit state；
If the active power of output of the nuclear power unit and output electric current calculated value are to the normal running (operation) conditions and the stoppage in transit
Condition is all unsatisfactory for；
Then the nuclear power unit is in operation exception state.
7. the method according to claim 1, wherein further include:
Breaker position signal is obtained in the nuclear power unit to monitor nuclear power unit actual motion state；
If breaker position signal is closure in the nuclear power unit, the nuclear power unit is in normal operating condition, then not
Need to carry out the nuclear power unit to cut machine operation；
If breaker position signal is to disconnect, and meet the following conditions in the nuclear power unit, then the nuclear power unit is in
Stoppage in transit state does not need then to carry out cutting machine operation to the nuclear power unit；Otherwise the nuclear power unit is in operation exception state, institute
The condition stated are as follows:
| P |≤0.95 × PT and | I |≤0.95 × IT
Wherein | P | it is the active power of output of the nuclear power unit, PT is in institute under normal operating condition for the nuclear power unit
The minimum active power of output needed, and PT is to be set in advance, | I | it is the output electric current calculated value of the nuclear power unit, IT is
The nuclear power unit is in minimum output current calculated value required under normal operating condition, and IT is to be set in advance.
8. the method according to claim 1, wherein described cut the preferential round table of machine further include:
What is cut off every time is to influence minimum unit to nuclear power substation stability of power system, and at least protect in each nuclear power substation
Stay the nuclear power unit operation.
9. the method according to claim 1, wherein the nuclear power unit is in normal operating condition, comprising:
The frequency of running current is in 49.2-50.5Hz in the nuclear power unit；
The running current of transmission line of electricity must not exceed the minimum value of the following terms element running current in the nuclear power unit:
Environment temperature be 35 DEG C when the current-carrying capacity of transmission line of electricity, a rated current of route disconnecting link, trap it is primary 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 unit；
When take cut machine measure after, the running current in single element in the nuclear power unit is no more than failure current limit value, and
And the amplitude fluctuations of the running current must not exceed 8%；
The wherein maximum current value that the failure current limit value can carry for the element, and the failure current limit value shifts to an earlier date
Setting.
10. the method according to claim 1, wherein the nuclear power unit is in operation exception state, comprising:
Running current frequency is within the scope 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. the method according to claim 1, wherein further include,
When N-2 failure occurs for nuclear power unit, then to machine operation is cut described in nuclear power unit execution, the nuclear power substation where it is reduced
Output power.
12. according to the method for claim 11, which is characterized in that when nuclear power unit occur N-2 failure when, where core
The calculation formula of electronic station output power reduction amount are as follows:
Dg=(PD-PS)×KL
Wherein DgThe nuclear power substation needs the output power cut off, PDThe trend value of transmission line of electricity in the nuclear power substation；PSFor
The movement trend value of transmission line of electricity in the nuclear power substation；KLFor the action factor of the nuclear power substation.
13. according to claim 1, method described in 3,4,6 or 7, which is characterized in that when the nuclear power unit is in overlond running
State；
If the transmission cross-section delivering power of the nuclear power unit overloads, the machine of cutting is taken to operate nuclear power unit；
Otherwise, cutting load is taken to operate the nuclear power unit.
14. according to the method for claim 13, which is characterized in that when the nuclear power unit is in overlond running state, then
Including following overload processing step:
Step A1, when any back transmission line meets the following conditions simultaneously in the nuclear power unit:
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 unit
Power, PSETFor the rated output power of nuclear power unit；tBFor the actual time delay time of running current on transmission line of electricity, tSETFor core
Motor group exports electric current delay rated value；
Step A2, according to it is described cut the preferential round table of machine to nuclear power unit execute described in cut machine operation, and cut out one every time
Nuclear power unit；
Step A3, rejudge the nuclear power unit transmission line of electricity whether and meanwhile meet condition described in step A1；If meeting
The condition then return step A2 is executed cut machine operation again；Otherwise, the nuclear power unit returns to normal operating condition, no longer
Machine operation is cut in execution.
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| CN104637558A (en) * | 2015-01-23 | 2015-05-20 | 福建省电力勘测设计院 | Safe and stable control method for asynchronous oscillation of nuclear power unit |
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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 |
| CN104637558A (en) * | 2015-01-23 | 2015-05-20 | 福建省电力勘测设计院 | Safe and stable control method for asynchronous oscillation of nuclear power unit |
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