CN103806959A - Method and device for preventing turbine control system of nuclear power station from generating disturbance - Google Patents
Method and device for preventing turbine control system of nuclear power station from generating disturbance Download PDFInfo
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- CN103806959A CN103806959A CN201210457607.3A CN201210457607A CN103806959A CN 103806959 A CN103806959 A CN 103806959A CN 201210457607 A CN201210457607 A CN 201210457607A CN 103806959 A CN103806959 A CN 103806959A
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Abstract
The invention is suitable for the professional technical field of a million kilowatt level pressurized water rector nuclear power station and provides a method and a device for preventing a turbine control system of the nuclear power station from generating disturbance. The method comprises the steps of detecting the maximum acceleration of a rotor of the turbine in the nuclear power station when a power grid is subjected to a transient fault; setting the acceleration limitation of a high cylinder cutoff valve of the turbine in the nuclear power station to be larger than or equal to the maximum acceleration of the rotor of the turbine in the nuclear power station when the power grid is subjected to the transient fault; limiting a switch of the high cylinder cutoff valve of the turbine according to the acceleration of the high cylinder cutoff valve of the turbine in the nuclear power station. According to the method and the device for preventing the turbine control system of the nuclear system from generating disturbance, the high cylinder cutoff valve of the turbine is prevented from being subjected to the turbine locking phenomenon during the transient fault of the power grid.
Description
Technical field
The invention belongs to kilowatt pressurized water reactor nuclear power station professional skill field, relate in particular to a kind of method and apparatus of short circuit malfunction to steam turbine for nuclear power station control system generation disturbance that prevent.
Background technique
The steam turbine control system of kilowatt pressurized water reactor nuclear power station generally has the functions such as rotating speed control, load control, overspeed protection, the supervision of steam turbine power generation parameter, thermal stress calculating.Wherein the mode of overspeed protection has multiplely, and wherein a kind of mode is acceleration overspeed protection mode.In the time that steam turbine adopts acceleration overspeed protection mode; if there is electrical network transient fault; due to the mechanical property of the high cylinder stop valve of steam turbine; will cause steam turbine generation vapour lock phenomenon; thereby cause generator set to be forced to maintain low power operating state, when serious, will affect the parameters such as Steam Turbine Vibration and cause steam turbine to be forced to beat lock.Wherein the principle of steam turbine generation vapour lock phenomenon is as follows:
In the time that steam turbine for nuclear power station control system suffers large disturbance (as near electrical network generation two-phase generator of nuclear power station group or three-phase ground fault), various Operational Limitss in steam turbine for nuclear power station control system are (as voltage, electric current and power etc.) will occur sharply to change, cause generator electromagnetic power to decline, even if but the output power of steam turbine can not be adjusted with the transient change of generator electromagnetic power due to inertia effects, thereby make the balance between generated output power and the input power of steam turbine be subject to heavy damage, the uneven torque of corresponding appearance in unit rotating shaft, make steam turbine for nuclear power station rotor acceleration exceed predefined value.
When cause the acceleration of this fault point steam turbine for nuclear power station rotor around to exceed predefined value due to electrical network transient fault, think that turbine speed is out of control, now will close the high cylinder modulating valve of steam turbine and the high cylinder stop valve of steam turbine simultaneously.After electrical network transient fault disappears, under automatic Load control, the high cylinder modulating valve of steam turbine and the high cylinder stop valve of steam turbine will be opened rapidly, but the opening speed of the high cylinder modulating valve of steam turbine is faster more than 10 times than the opening speed of the high cylinder stop valve of steam turbine, this will cause the high cylinder stop valve of steam turbine also in pilot valve open stage, the high cylinder modulating valve of steam turbine has reached very large aperture, let out the vapor pressure of having adjusted the high cylinder stop valve of steam turbine downstream, thereby before and after making the high cylinder stop valve of steam turbine, differential pressure is excessive, and for cannot overcoming the front and back pressure reduction of the high cylinder stop valve of steam turbine to the oil engine of steam turbine fuel feeding, the high cylinder stop valve of steam turbine is pinned by steam differential pressure, be that the high cylinder stop valve of steam turbine can not continue to open after its pilot valve standard-sized sheet.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of and prevents that short circuit malfunction from producing the method for disturbance to steam turbine for nuclear power station control system, is intended to solve the problem of vapour lock phenomenon how to avoid steam turbine in the time of electrical network generation transient fault.
The embodiment of the present invention is achieved in that a kind of method that prevents steam turbine for nuclear power station control system to produce disturbance, and described method comprises:
Detect the maximum acceleration of turbine rotor in nuclear power station in the time of electrical network generation transient fault;
In nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine is set to be greater than or equal in the time of electrical network generation transient fault the maximum acceleration of turbine rotor in nuclear power station;
According to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of steam turbine in nuclear power station.
Another object of the embodiment of the present invention is to provide a kind of device that prevents steam turbine for nuclear power station control system to produce disturbance, and described device comprises:
Maximum acceleration detection unit, for detection of the maximum acceleration of turbine rotor in nuclear power station when the electrical network generation transient fault;
Stop valve restriction setting unit, is set to be greater than or equal to when the electrical network generation transient fault maximum acceleration of turbine rotor in nuclear power station for the acceleration limit of the high cylinder stop valve of nuclear power station steam turbine;
Stop valve response unit, for according to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of nuclear power station steam turbine.
In embodiments of the present invention, the maximum acceleration of turbine rotor while being set to electrical network generation transient fault by the acceleration limit of the high cylinder stop valve of steam turbine, and according to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of steam turbine, thereby avoid because the transient fault of electrical network makes the high cylinder stop valve of steam turbine generation vapour lock fault, further avoid being forced to maintain due to the generator set that the high cylinder stop valve of steam turbine generation vapour lock fault causes the state of low power run.
Accompanying drawing explanation
Fig. 1 is that the short circuit malfunction that prevents that the embodiment of the present invention provides produces the realization flow figure of the method for disturbance to steam turbine for nuclear power station control system;
Fig. 2 is the detection that provides of embodiment of the present invention realization flow figure of the maximum acceleration of turbine rotor in nuclear power station in the time of electrical network generation transient fault;
Fig. 3 is that the short circuit malfunction that prevents that another embodiment of the present invention provides produces the realization flow figure of the method for disturbance to steam turbine for nuclear power station control system;
Fig. 4 is steam turbine high cylinder modulating valve response curve and the high cylinder stop valve of the steam turbine response curve comparison diagram that the embodiment of the present invention provides;
Fig. 5 is that the short circuit malfunction that prevents that the embodiment of the present invention provides produces the structured flowchart of the device of disturbance to steam turbine for nuclear power station control system.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
In embodiments of the present invention, the acceleration limit of the high cylinder stop valve of steam turbine is set to be greater than or equal to the maximum acceleration of turbine rotor in the time of electrical network generation transient fault, in the time of electrical network generation transient fault, if the actual acceleration of turbine rotor is less than the acceleration limit of the high cylinder stop valve of steam turbine, controlling the high cylinder stop valve of steam turbine is held open, thereby avoid because the transient fault of electrical network makes the high cylinder stop valve of steam turbine generation vapour lock fault, further avoid being forced to maintain due to the generator set that the high cylinder stop valve of steam turbine generation vapour lock fault causes the state of low power run.
For technical solutions according to the invention are described, describe below by specific embodiment.
The short circuit malfunction that prevents that Fig. 1 shows the embodiment of the present invention to be provided produces the realization flow of the method for disturbance to steam turbine for nuclear power station control system, details are as follows:
In step S101, detect the maximum acceleration of turbine rotor in nuclear power station in the time of electrical network generation transient fault.
Wherein electrical network generation transient fault refers to the fault that the generator set outlet voltage transient in nuclear power station power station declines.This electrical network generation transient fault includes but not limited to electrical network generation two-phase or three-phase ground fault or the electrical network fault etc. that is short-circuited.
In the present embodiment, in the time of electrical network generation transient fault, to make near steam turbine for nuclear power station control system fault point suffer larger disturbance, the various Operational Limitss (as voltage, electric current, power etc.) of steam turbine for nuclear power station control system are by the variation occurring sharply, as voltage sharply descends degradation, further cause generator electromagnetic power to decline.But the output power of steam turbine is because inertia effects can not reduce immediately, the output power that is steam turbine can not be adjusted in time along with the transient change of generator electromagnetic power, thereby make the balance between generated output power and steam turbine input power be subject to heavy damage, make to occur on rotating shaft of steam turbine corresponding uneven torque, thereby accelerate the rotating speed of turbine rotor and the relative angle between turbine rotor is changed.In the time of electrical network generation transient fault, turbine rotor accelerates because of the electromagnetic power bust of generator, and merit angle increases.
In the time that faulty line excises, if make the electromagnetic power of generator be greater than steam turbine power because merit angle increases this moment, steam turbine slows down, in the time that generator speed is greater than certain predefined value (turning as 3000), merit angle continues to increase, until generator speed reverts to synchronous speed, now electromagnetic power is still greater than steam turbine power, so turbine rotor speed continues to reduce, merit angle starts to reduce, and is greater than electromagnetic power when crossing steam turbine power after equinoctial point, and steam turbine starts again to accelerate, so repeatedly, until reach new equinoctial point.
In the above-mentioned equilibrium process of steam turbine, exist one to reach a peaked process because transient fault causes the acceleration of turbine rotor, the present embodiment is and detects in the time of electrical network generation transient fault the maximum acceleration of turbine rotor in nuclear power station.
Wherein detect in the time of electrical network generation transient fault in nuclear power station the detailed process of the maximum acceleration of turbine rotor as follows:
Basic principle is: due to determine turbine rotor acceleration magnitude be the poor of steam turbine machine torque and generator electromagnetic torque.And steam turbine output power equals steam turbine torque times with rotating speed, the per unit value of torque of thinking that can be similar in the situation that rotation speed change scope is little equals the per unit value of power, can think that the acceleration magnitude of turbine rotor and the output work rate variance of steam turbine have the relation of approximately linear under such assumed condition.
According to above basic principle, refer to Fig. 2, the detection providing for embodiment of the present invention realization flow of the maximum acceleration of turbine rotor in nuclear power station in the time of electrical network generation transient fault, details are as follows:
S201, the difference power of generator set before and after collection fault.Wherein concrete detecting method belongs to prior art, does not repeat them here.
S202, while gathering fault, the top speed of turbine rotor changes amplitude, the acceleration of turbine rotor while being converted into fault.Its concrete conversion process belongs to prior art, does not repeat them here.
S203, obtains the maximum work rate variance of generator set before and after fault under extreme case.
S204, the maximum work rate variance of fault front and back generator set under the acceleration of turbine rotor and extreme case during according to the difference power of generator set before and after fault, fault, according to the linear relationship between the acceleration of turbine rotor and the difference power of steam turbine, the maximum acceleration of turbine rotor in nuclear power station when estimation electrical network generation transient fault.
In order to make method provided by the invention clearer, easy to understand, below describes as an example of electrical network generation three-phase ground fault example:
Before and after assumed fault, actual measurement to the output work rate variance of certain generator be 778 megawatts (MW), when fault actual measurement to the maximum acceleration of turbine rotor be 9.67% per second, under extreme case, before and after fault, the maximum work rate variance of generator set is 993MW, and when the electrical network generation three-phase ground being estimated to hinders, in nuclear power station, the maximum acceleration of turbine rotor is: (993 × 9.67)/778=12.34% is per second.
In another embodiment of the present invention, also can be by the maximum acceleration of turbine rotor in electrical network generation three-phase ground when barrier nuclear power station in the multiple different generator set of estimation, the maximum acceleration of turbine rotor in nuclear power station while therefrom selecting a maximum value to be short-circuited fault as the final electrical network detecting, like this, can guarantee that the plurality of different generator set all can not produce vapour lock phenomenon.
For make to detect electrical network generation transient fault time nuclear power station in the maximum acceleration of turbine rotor more accurate, in another embodiment of the present invention, the method also comprises the steps:
The maximum acceleration of turbine rotor in nuclear power station when different transient fault occurs detection of grid respectively.
Its testing process is described above, does not repeat them here.The maximum acceleration of turbine rotor in nuclear power station during as difference detection of grid generation double earthfault, the maximum acceleration of turbine rotor in nuclear power station when electrical network generation three-phase ground fault, and electrical network maximum acceleration of turbine rotor in nuclear power station while being short-circuited fault.
A maximum maximum acceleration for turbine rotor in nuclear power station when the final electrical network detecting is short-circuited fault in the maximum acceleration of turbine rotor in nuclear power station when different transient fault occurs electrical network, like this, no matter, can not cause the vapour lock phenomenon in nuclear power generating sets if there is which kind of transient fault in electrical network.
In the present embodiment, while there is different transient fault by above-mentioned detection of grid, in nuclear power station, the maximum acceleration of turbine rotor is generally all less than 15% per second, for the ease of understanding, when different transient fault occurs electrical network, in nuclear power station, the maximum acceleration of turbine rotor is got 15% per second.
In order further to prevent that nuclear power generating sets from producing vapour lock phenomenon, in another embodiment of the present invention, the method also comprises the steps:
For detect electrical network generation transient fault time nuclear power station in the maximum acceleration of turbine rotor increase default nargin.Wherein default nargin can require arrange for the difference of Security according to different nuclear power station, if default nargin can be 1/3 etc., but is not limited with this value.
In the present embodiment, in the time there is different transient fault for the electrical network that detects, in nuclear power station, the maximum acceleration of turbine rotor increases after 1/3 default nargin, and when different transient fault occurs this electrical network, in nuclear power station, the maximum acceleration of turbine rotor becomes 20% per second.
In step S102, in nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine is set to be greater than or equal in the time of electrical network generation transient fault the maximum acceleration of turbine rotor in nuclear power station.
Wherein the acceleration limit of the high cylinder stop valve of steam turbine refers to the maximum acceleration that can not cause the turbine rotor that the high cylinder stop valve of steam turbine closes of permission.
In the present embodiment, in order to guarantee the security of operation of steam turbine, need to overspeed protection mechanism be set for steam turbine.Wherein the principle of turbine over mechanism is summarized as follows:
The acceleration of Real-Time Monitoring turbine rotor, in the time that the acceleration of turbine rotor exceedes acceleration limit, the high cylinder modulating valve of quick closedown steam turbine and the high cylinder stop valve of steam turbine, badly damaged with the steam turbine equipment that prevents from causing due to Steam Turbine Over-speed Accident.
In the present embodiment, be set to be greater than or equal to when the electrical network generation transient fault maximum acceleration of turbine rotor in nuclear power station by the acceleration limit of turbine rotor, like this, in the time of near electrical network generation transient fault nuclear power station, due to actual measurement to nuclear power station in the acceleration of turbine rotor be less than all the time the acceleration limit of turbine rotor, thereby can not start the acceleration protection mechanism of steam turbine, also just can not cause the malfunction of the high cylinder stop valve of steam turbine because of near electrical network generation transient fault nuclear power station, further avoid the high cylinder stop valve of steam turbine to produce gas lock phenomenon.
In the present embodiment, in can nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine be set to 20% per second per second to 22.5%, when the maximum acceleration of turbine rotor in nuclear power station reaches 20% time per second, start to close the high cylinder stop valve of steam turbine, in nuclear power station, the maximum acceleration of turbine rotor reaches 22.5% time per second, and the high cylinder stop valve of steam turbine is closed completely.Be appreciated that, in nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine is not limited with this value, can this nuclear power station in the acceleration limit of the high cylinder stop valve of steam turbine be set to be greater than or equal to arbitrarily in the time of electrical network generation transient fault any one value in the maximum acceleration of turbine rotor in nuclear power station.
In step S103, according to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of steam turbine in nuclear power station.Its detailed process is as follows:
In the time that the actual acceleration of turbine rotor in nuclear power station is less than the acceleration limit of the high cylinder stop valve of steam turbine, controls the high cylinder stop valve of steam turbine in nuclear power station and be held open; In the time that the actual acceleration of turbine rotor in nuclear power station reaches the acceleration limit of the high cylinder stop valve of steam turbine, close the high cylinder stop valve of steam turbine.The detailed process of wherein closing the high cylinder stop valve of steam turbine is as follows:
In the time that the actual acceleration of turbine rotor in nuclear power station reaches the acceleration limit of the high cylinder stop valve of steam turbine, start to close the high cylinder stop valve of steam turbine, and in the time that the actual acceleration of turbine rotor reaches the maximum value of acceleration limit of the high cylinder stop valve of steam turbine, the high cylinder stop valve of steam turbine is closed completely.As being 20% per second time per second to 22.5% when the acceleration limit of the high cylinder stop valve of steam turbine, when the actual acceleration of turbine rotor in nuclear power station reaches 20% time per second, start to close the high cylinder stop valve of steam turbine, and reaching 22.5% time per second at the actual acceleration of turbine rotor, the high cylinder stop valve of steam turbine is closed completely.
In embodiments of the present invention, the maximum acceleration of turbine rotor when the acceleration limit of high steam turbine cylinder stop valve is made as to electrical network generation transient fault, thereby in the time there is electrical network transient fault, the actual acceleration of the turbine rotor detecting is all less than the acceleration limit of the high cylinder stop valve of steam turbine, like this, in the time there is electrical network transient fault, can not close the high cylinder stop valve of steam turbine, after electric network fault is got rid of, also just need not open immediately the high cylinder stop valve of steam turbine, avoid the problem of the frequent switch of the high cylinder stop valve of steam turbine causing due to electrical network generation transient fault, thereby avoid steam turbine generation vapour lock phenomenon, further avoid generator set to be forced to maintain the phenomenon of low power operating state, improve the reliability of steam turbine for nuclear power station control system.
The short circuit malfunction that prevents that Fig. 3 shows another embodiment of the present invention to be provided produces the realization flow of the method for disturbance to steam turbine for nuclear power station control system, details are as follows:
In step S301, detect the maximum acceleration of turbine rotor in nuclear power station in the time of electrical network generation transient fault.Its detailed process is described above, does not repeat them here.
In step S302, in nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine is set to be greater than or equal in the time of electrical network generation transient fault the maximum acceleration of turbine rotor in nuclear power station, keeps the acceleration limit of the high cylinder modulating valve of steam turbine in nuclear power station constant simultaneously.
In the present embodiment, by acceleration limit being set respectively for the high cylinder stop valve of steam turbine and the high cylinder modulating valve of steam turbine, by separate the control of high steam turbine cylinder stop valve and the high cylinder modulating valve of steam turbine, thereby the high cylinder modulating valve of steam turbine can be controlled normally according to the original control principle of steam turbine, guarantee the security of operation of nuclear power station, by adjusting the acceleration limit of the high cylinder stop valve of steam turbine, can avoid the high cylinder stop valve of steam turbine to produce vapour lock phenomenon simultaneously.
In the present embodiment, acceleration limit that can the high cylinder stop valve of steam turbine is set to 20% to 22.5%, and the acceleration limit of the high cylinder modulating valve of steam turbine is set to 5% to 6%.
In step S303, according to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of steam turbine in nuclear power station, according to the switch of the high cylinder modulating valve of acceleration limit control steam turbine of the high cylinder modulating valve of steam turbine in nuclear power station.
Refer to Fig. 4, the steam turbine high cylinder modulating valve response curve and the high cylinder stop valve of the steam turbine response curve comparison diagram that provide for the embodiment of the present invention, acceleration limit with the high cylinder stop valve of steam turbine is set to 20% to 22.5%, and the acceleration limit of the high cylinder modulating valve of steam turbine is set to 5% to 6% for example, describe its detailed process in detail as follows:
In the time that the actual acceleration of turbine rotor is less than the acceleration limit (20% is per second) of the high cylinder stop valve of steam turbine, controlling the high cylinder stop valve of steam turbine is held open, in the time that the actual acceleration of turbine rotor reaches the acceleration limit (20% is per second) of the high cylinder stop valve of steam turbine, start to close the high cylinder stop valve of steam turbine, and in the time that the actual acceleration of turbine rotor reaches the maximum value (22.5% is per second) of the acceleration limit of the high cylinder stop valve of steam turbine, the high cylinder stop valve of steam turbine is closed completely.
In the time that the actual acceleration of turbine rotor is less than the acceleration limit (5% is per second) of the high cylinder modulating valve of steam turbine, controlling the high cylinder modulating valve of steam turbine is held open, in the time that the actual acceleration of turbine rotor reaches the acceleration limit (5% is per second) of the high cylinder modulating valve of steam turbine, start to close the high cylinder modulating valve of steam turbine, and in the time that the actual acceleration of turbine rotor reaches the maximum value (6% is per second) of the acceleration limit of the high cylinder stop valve of steam turbine, the high cylinder modulating valve of steam turbine cuts out completely.
In embodiments of the present invention, in the time of electrical network generation transient fault, the acceleration that turbine rotor produces is that power-balance process rotor swings the acceleration instantaneous perturbation causing, actual speed variable quantity is less, now, by closing rapidly of the high cylinder modulating valve of steam turbine in nuclear power station, be enough to respond this electrical network generation transient fault and near the variation of the generator set load fault point that causes.
In embodiments of the present invention, the maximum acceleration of steam turbine when the acceleration limit of high steam turbine cylinder stop valve is made as to electrical network generation transient fault, thereby in the time there is electrical network transient fault, the actual acceleration of the steam turbine detecting is all less than the acceleration limit of the high cylinder stop valve of steam turbine, like this, in the time there is electrical network transient fault, only can close the high cylinder modulating valve of steam turbine, near the variation of the generator set load fault point causing due to electrical network transient fault with response, and can not close the high cylinder stop valve of steam turbine, thereby after electric network fault disappears, the high cylinder modulating valve of steam turbine can be opened rapidly under automatic Load control, and the high cylinder stop valve of steam turbine is not closed due to before it, thereby also need under automatic Load control, not open, thereby avoid steam turbine generation vapour lock phenomenon, further avoid generator set to be forced to maintain the phenomenon of low power operating state.
Fig. 5 shows the structure that prevents steam turbine for nuclear power station control system to produce the device of disturbance that the embodiment of the present invention provides, and only shows for convenience of explanation the part relevant to the embodiment of the present invention.
This device can be for steam turbine control apparatus, can be to run on the unit that software unit, hardware cell or software and hardware in steam turbine control apparatus combine, also can be used as independently suspension member and be integrated in steam turbine control apparatus or run in the application system of steam turbine control apparatus, this device comprises:
Maximum acceleration detection unit 1 is for detection of the maximum acceleration of turbine rotor in nuclear power station when the electrical network generation transient fault.
Wherein electrical network generation transient fault refers to the fault that the generator set outlet voltage transient in nuclear power station power station declines.This electrical network generation transient fault includes but not limited to electrical network generation two-phase or three-phase ground fault or the electrical network fault etc. that is short-circuited.
In the preferred embodiment of the present invention, this maximum acceleration detection unit 1 specifically comprises:
The first difference power acquisition module 11 is for gathering the difference power of fault front and back generator set.
The top speed of acceleration acquisition module 12 turbine rotor when gathering fault changes amplitude, the acceleration of steam turbine rotor while being converted into fault.
The second difference power acquisition module 13 is for obtaining the maximum work rate variance of fault front and back generator set under extreme case.
The maximum work rate variance of generator set before and after fault under the acceleration of maximum acceleration estimation block 14 turbine rotor when according to the difference power of generator set before and after fault, fault and extreme case, according to the linear relationship between the acceleration of turbine rotor and the difference power of steam turbine, the maximum acceleration of turbine rotor in nuclear power station when estimation electrical network generation transient fault.
In another embodiment of the present invention, this maximum acceleration detection unit 1 is the maximum acceleration of turbine rotor in nuclear power station when estimating multiple different generator set electrical network generation three-phase grounds barrier also, the maximum acceleration of turbine rotor in nuclear power station while therefrom selecting a maximum value to be short-circuited fault as the electrical network detecting.
In another embodiment of the present invention, this maximum acceleration detection unit 1 is the maximum acceleration of nuclear power station turbine rotor when different transient fault occurs detection of grid respectively also, and when there is different transient fault in electrical network a maximum maximum acceleration for turbine rotor in nuclear power station when the electrical network detecting is short-circuited fault in the maximum acceleration of turbine rotor in nuclear power station.
In another embodiment of the present invention, this device also comprises:
When maximum acceleration amending unit 4 is used to the electrical network generation transient fault detecting, in nuclear power station, the maximum acceleration of turbine rotor increases default nargin.Wherein default nargin can require arrange for the difference of Security according to different nuclear power station, if default nargin can be 1/3 etc., but is not limited with this value.
Stop valve restriction setting unit 2 is set to be greater than or equal to when the electrical network generation transient fault maximum acceleration of turbine rotor in nuclear power station for the acceleration limit of the high cylinder stop valve of nuclear power station steam turbine.
Wherein the acceleration limit of the high cylinder stop valve of steam turbine refers to the maximum acceleration that can not cause the turbine rotor that the high cylinder stop valve of steam turbine closes of permission.
In the present embodiment, in can nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine be set to 20% per second per second to 22.5%, when the maximum acceleration of turbine rotor in nuclear power station reaches 20% time per second, start to close the high cylinder stop valve of steam turbine, in nuclear power station, the maximum acceleration of turbine rotor reaches 22.5% time per second, and the high cylinder stop valve of steam turbine is closed completely.Be appreciated that, in nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine is not limited with this value, can this nuclear power station in the acceleration limit of the high cylinder stop valve of steam turbine be set to be greater than or equal to arbitrarily in the time of electrical network generation transient fault any one value in the maximum acceleration of turbine rotor in nuclear power station.
Stop valve response unit 3 is for according to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of nuclear power station steam turbine.
Its detailed process is as follows:
In the time that the actual acceleration of turbine rotor in nuclear power station is less than the acceleration limit of the high cylinder stop valve of steam turbine, controls the high cylinder stop valve of steam turbine in nuclear power station and be held open; In the time that the actual acceleration of turbine rotor in nuclear power station reaches the acceleration limit of the high cylinder stop valve of steam turbine, close the high cylinder stop valve of steam turbine.The detailed process of wherein closing the high cylinder stop valve of steam turbine is as follows:
In the time that the actual acceleration of turbine rotor in nuclear power station reaches the acceleration limit of the high cylinder stop valve of steam turbine, start to close the high cylinder stop valve of steam turbine, and in the time that the actual acceleration of turbine rotor reaches the maximum value of acceleration limit of the high cylinder stop valve of steam turbine, the high cylinder stop valve of steam turbine is closed completely.
In another embodiment of the present invention, this stop valve response unit 3 is specifically for being less than 20% time per second at the actual acceleration of turbine rotor, controlling the high cylinder stop valve of steam turbine is held open, when the actual acceleration of turbine rotor reaches 20% time per second, start to close the high cylinder stop valve of steam turbine, and reaching 22.5% time per second at the actual acceleration of turbine rotor, the high cylinder stop valve of steam turbine is closed completely.
In another embodiment of the present invention, this device also comprises:
Modulating valve restriction setting unit 5 is for keeping the acceleration limit of the high cylinder modulating valve of nuclear power station steam turbine constant.
In the present embodiment, acceleration limit that can the high cylinder stop valve of steam turbine is set to 20% to 22.5%, and the acceleration limit of the high cylinder modulating valve of steam turbine is set to 5% to 6%.
Modulating valve response unit 6 is for according to the switch of the high cylinder modulating valve of acceleration limit control steam turbine of the high cylinder modulating valve of nuclear power station steam turbine.
Modulating valve response unit 6 is specifically for being less than 5% time per second at the actual acceleration of turbine rotor, controlling the high cylinder modulating valve of steam turbine is held open, when the actual acceleration of turbine rotor reaches 5% time per second, start to close the high cylinder modulating valve of steam turbine, and reaching 6% time per second at the actual acceleration of turbine rotor, the high cylinder modulating valve of steam turbine cuts out completely.
It should be noted that said system, included unit is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
One of ordinary skill in the art will appreciate that, the all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, described program can be being stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
In embodiments of the present invention, the maximum acceleration of turbine rotor when the acceleration limit of high steam turbine cylinder stop valve is made as to electrical network generation transient fault, thereby in the time there is electrical network transient fault, the actual acceleration of the turbine rotor detecting is all less than the acceleration limit of the high cylinder stop valve of steam turbine, like this, in the time there is electrical network transient fault, can not close the high cylinder stop valve of steam turbine, after electric network fault is got rid of, also just need not open immediately the high cylinder stop valve of steam turbine, avoid the problem of the frequent switch of the high cylinder stop valve of steam turbine causing due to electrical network generation transient fault, thereby avoid steam turbine generation vapour lock phenomenon, further avoid generator set to be forced to maintain the phenomenon of low power operating state, improve the reliability of steam turbine for nuclear power station control system.By acceleration limit being set respectively for the high cylinder stop valve of steam turbine and the high cylinder modulating valve of steam turbine, by separate the control of high steam turbine cylinder stop valve and the high cylinder modulating valve of steam turbine, thereby the high cylinder modulating valve of steam turbine can be controlled normally according to the original control principle of steam turbine, guarantee the security of operation of nuclear power station, by adjusting the acceleration limit of the high cylinder stop valve of steam turbine, can avoid the high cylinder stop valve of steam turbine to produce vapour lock phenomenon simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (16)
1. the method that prevents steam turbine for nuclear power station control system to produce disturbance, is characterized in that, described method comprises:
Detect the maximum acceleration of turbine rotor in nuclear power station in the time of electrical network generation transient fault;
In nuclear power station, the acceleration limit of the high cylinder stop valve of steam turbine is set to be greater than or equal in the time of electrical network generation transient fault the maximum acceleration of turbine rotor in nuclear power station;
According to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of steam turbine in nuclear power station.
2. the method for claim 1, is characterized in that, described detection in the time of electrical network generation transient fault in nuclear power station the maximum acceleration of turbine rotor specifically comprise:
Gather the difference power of fault front and back generator set;
While gathering fault, the top speed of turbine rotor changes amplitude, the acceleration of steam turbine rotor while being converted into fault;
Obtain the maximum work rate variance of fault front and back generator set under extreme case;
The maximum work rate variance of fault front and back generator set under the acceleration of turbine rotor and extreme case during according to the difference power of generator set before and after fault, fault, according to the linear relationship between the acceleration of turbine rotor and the difference power of steam turbine, the maximum acceleration of turbine rotor in nuclear power station when estimation electrical network generation transient fault.
3. the method for claim 1, is characterized in that, described method also comprises:
The maximum acceleration of turbine rotor in nuclear power station while estimating the barrier of electrical network generation three-phase ground in multiple different generator set, the maximum acceleration of turbine rotor in nuclear power station while therefrom selecting a maximum value to be short-circuited fault as the electrical network detecting.
4. the method for claim 1, is characterized in that, described method also comprises:
The maximum acceleration of turbine rotor in nuclear power station when different transient fault occurs detection of grid respectively;
A maximum maximum acceleration for turbine rotor in nuclear power station when the electrical network detecting is short-circuited fault in the maximum acceleration of turbine rotor in nuclear power station when different transient fault occurs electrical network.
5. the method as described in claim 1 to 4 any one, is characterized in that, described method also comprises:
For detect electrical network generation transient fault time nuclear power station in the maximum acceleration of turbine rotor increase default nargin.
6. the method as described in claim 1 to 4 any one, is characterized in that, described method also comprises:
Keep the acceleration limit of the high cylinder modulating valve of steam turbine in nuclear power station constant;
According to the switch of the high cylinder modulating valve of acceleration limit control steam turbine of the high cylinder modulating valve of steam turbine in nuclear power station.
7. method as claimed in claim 6, is characterized in that, the acceleration limit of the high cylinder stop valve of described steam turbine is 20% per second to 22.5% per second, and the acceleration limit of the high cylinder modulating valve of described steam turbine is 5% per second per second to 6%.
8. method as claimed in claim 7, is characterized in that, the described switch according to the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of steam turbine in nuclear power station specifically comprises:
When the actual acceleration of turbine rotor is less than 20% time per second, controlling the high cylinder stop valve of steam turbine is held open, when the actual acceleration of turbine rotor reaches 20% time per second, start to close the high cylinder stop valve of steam turbine, and reaching 22.5% time per second at the actual acceleration of turbine rotor, the high cylinder stop valve of steam turbine is closed completely;
The described switch according to the high cylinder modulating valve of acceleration limit control steam turbine of the high cylinder modulating valve of steam turbine in nuclear power station specifically comprises:
When the actual acceleration of turbine rotor is less than 5% time per second, controlling the high cylinder modulating valve of steam turbine is held open, when the actual acceleration of turbine rotor reaches 5% time per second, start to close the high cylinder modulating valve of steam turbine, and reaching 6% time per second at the actual acceleration of turbine rotor, the high cylinder modulating valve of steam turbine cuts out completely.
9. the device that prevents steam turbine for nuclear power station control system to produce disturbance, is characterized in that, described device comprises:
Maximum acceleration detection unit, for detection of the maximum acceleration of turbine rotor in nuclear power station when the electrical network generation transient fault;
Stop valve restriction setting unit, is set to be greater than or equal to when the electrical network generation transient fault maximum acceleration of turbine rotor in nuclear power station for the acceleration limit of the high cylinder stop valve of nuclear power station steam turbine;
Stop valve response unit, for according to the switch of the high cylinder stop valve of acceleration limit control steam turbine of the high cylinder stop valve of nuclear power station steam turbine.
10. device as claimed in claim 9, is characterized in that, described maximum acceleration detection unit specifically comprises:
The first difference power acquisition module, for gathering the difference power of fault front and back generator set;
Acceleration acquisition module, the top speed of turbine rotor changes amplitude, the acceleration of steam turbine rotor while being converted into fault when gathering fault;
The second difference power acquisition module, for obtaining the maximum work rate variance of fault front and back generator set under extreme case;
Maximum acceleration estimation block, the maximum work rate variance of fault front and back generator set under the acceleration of turbine rotor and extreme case while being used for according to the difference power of generator set before and after fault, fault, according to the linear relationship between the acceleration of turbine rotor and the difference power of steam turbine, the maximum acceleration of turbine rotor in nuclear power station when estimation electrical network generation transient fault.
11. devices as claimed in claim 9, it is characterized in that, described maximum acceleration detection unit is the maximum acceleration of turbine rotor in nuclear power station when estimating multiple different generator set electrical network generation three-phase grounds barrier also, the maximum acceleration of turbine rotor in nuclear power station while therefrom selecting a maximum value to be short-circuited fault as the electrical network detecting.
12. devices as claimed in claim 9, it is characterized in that, described maximum acceleration detection unit is the maximum acceleration of nuclear power station turbine rotor when different transient fault occurs detection of grid respectively also, and when there is different transient fault in electrical network a maximum maximum acceleration for turbine rotor in nuclear power station when the electrical network detecting is short-circuited fault in the maximum acceleration of turbine rotor in nuclear power station.
13. devices as described in claim 9 to 12 any one, is characterized in that, described device also comprises:
Maximum acceleration amending unit, while being used to the electrical network generation transient fault detecting, in nuclear power station, the maximum acceleration of turbine rotor increases default nargin.
14. devices as described in claim 9 to 12 any one, is characterized in that, described device also comprises:
Modulating valve restriction setting unit, for keeping the acceleration limit of the high cylinder modulating valve of nuclear power station steam turbine constant;
Modulating valve response unit, for according to the switch of the high cylinder modulating valve of acceleration limit control steam turbine of the high cylinder modulating valve of nuclear power station steam turbine.
15. devices as claimed in claim 14, is characterized in that, the acceleration limit of the high cylinder stop valve of described steam turbine is 20% per second to 22.5% per second, and the acceleration limit of the high cylinder modulating valve of described steam turbine is 5% per second per second to 6%.
16. devices as claimed in claim 15, it is characterized in that, described stop valve response unit is specifically for being less than 20% time per second at the actual acceleration of turbine rotor, controlling the high cylinder stop valve of steam turbine is held open, when the actual acceleration of turbine rotor reaches 20% time per second, start to close the high cylinder stop valve of steam turbine, and reach 22.5% time per second at the actual acceleration of turbine rotor, the high cylinder stop valve of steam turbine is closed completely;
Described modulating valve response unit is specifically for being less than 5% time per second at the actual acceleration of turbine rotor, controlling the high cylinder modulating valve of steam turbine is held open, when the actual acceleration of turbine rotor reaches 5% time per second, start to close the high cylinder modulating valve of steam turbine, and reaching 6% time per second at the actual acceleration of turbine rotor, the high cylinder modulating valve of steam turbine cuts out completely.
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| CN201210457607.3A CN103806959B (en) | 2012-11-14 | 2012-11-14 | Method and device for preventing turbine control system of nuclear power station from generating disturbance |
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| CN201210457607.3A CN103806959B (en) | 2012-11-14 | 2012-11-14 | Method and device for preventing turbine control system of nuclear power station from generating disturbance |
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| CN107402124A (en) * | 2017-07-20 | 2017-11-28 | 中广核工程有限公司 | A kind of nuclear power plant's Steam Turhine Adjustment valve group periodic test method and apparatus |
| CN109415949A (en) * | 2016-07-08 | 2019-03-01 | 通用电器技术有限公司 | Turbine trip speed and acceleration restrictor |
| CN109642470A (en) * | 2016-08-31 | 2019-04-16 | 通用电器技术有限公司 | Tightness for valve and actuator monitoring system tests assessment module |
| CN111927575A (en) * | 2020-06-30 | 2020-11-13 | 西门子工业透平机械（葫芦岛）有限公司 | Control system, control method, electronic device, and computer-readable storage medium |
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| CN103806959B (en) | 2015-06-24 |
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Address after: Shenzhen science and technology building, No. 1001 Futian District Road, Shenzhen city in Guangdong province 518031 17-19 floor Patentee after: China General Nuclear Power Corporation Patentee after: Dayawan Nuclear Power Running Management Co., Ltd. Address before: Shenzhen science and technology building, No. 1001 Futian District Road, Shenzhen city in Guangdong province 518031 17-19 floor Patentee before: China Guangdong Nuclear Power Group Co., Ltd. Patentee before: Dayawan Nuclear Power Running Management Co., Ltd. |
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Effective date of registration: 20151127 Address after: 518031 Guangdong province Futian District Shangbu Road West of the city of Shenzhen Shenzhen science and technology building, 15 Floor Patentee after: Lingao Nuclear Power Co., Ltd. Patentee after: China General Nuclear Power Corporation Address before: Shenzhen science and technology building, No. 1001 Futian District Road, Shenzhen city in Guangdong province 518031 17-19 floor Patentee before: China General Nuclear Power Corporation Patentee before: Dayawan Nuclear Power Running Management Co., Ltd. |