CN104793656A - Determining method and device of bypass pressure setting value - Google Patents
Determining method and device of bypass pressure setting value Download PDFInfo
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- CN104793656A CN104793656A CN201510160459.2A CN201510160459A CN104793656A CN 104793656 A CN104793656 A CN 104793656A CN 201510160459 A CN201510160459 A CN 201510160459A CN 104793656 A CN104793656 A CN 104793656A
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Abstract
An embodiment of the invention provides a determining method and device of a bypass pressure setting value. The method includes: according to a real-time process variable of a bypass control system, predicting variance trend and rate of main steam pressure of a bypass control system and variance trend and rate of main steam temperature by a prediction algorithm of a state observer; according to the predicted variance trend and rate of the main steam pressure, the predicted variance trend and rate of the main steam temperature, actual operation condition of the bypass control system and bypass operation characteristics, calculating a given function of the bypass pressure setting value; entering the predicted variance trend and rate of the main steam pressure and the predicted variance trend and rate of the main steam temperature into the given function of the bypass pressure setting value, and calculating the bypass pressure setting value. The determining method and device has the advantages that precision of the bypass pressure setting value is improved and the actual condition of a random set of the bypass pressure setting values can also be improved so as to allow adapting.
Description
Technical field
The present invention relates to gas-steam combined cycle set technical field, particularly a kind of defining method of bypass pressure setting value and device.
Background technology
Turbine bypass system is improving unit starting performance, is reducing steam turbine thermal stress, is improving important role in unit load adaptability and generator protection.
Gas-steam combined cycle set has and starts setup time short, the feature such as start and stop are quick, and bear the important task of peak load regulation network, now full-automatic Bypass Control System is particularly important.Along with the raising of Power Plant Thermal Process automatization level, APS (automatic start-stop control system) makes the start and stop of gas-steam combined cycle set become more efficiently convenient, greatly reduce the manipulation strength of operations staff, and the full-automatic Bypass Control System of steam turbine is the important leverage realizing APS.When gas-steam combined cycle set starts, Bypass Control System starts to get involved, and effectively reduces gas bypass device action, accelerates steam/water circulating and shortens radiator warm-up period; During combustion engine underrun, Bypass Control System intervention realization stops steam turbine and does not stop waste heat boiler; When the accident such as load dump occurs, comprise that unit opens, the stopping time, Bypass Control System gets involved carries out decompression protection, prevents air-out tube valve events, reduces noise pollution.
Whether appropriate the controlling difficulties of full-automatic Bypass Control System is that how given unit starting initial stage bypass pressure setting value is, bypass pressure setting value given, will directly affect start-up time and the operational efficiency of unit.
Unit high, medium and low voltage Bypass Control strategy is substantially identical, given for the pressure set points of unit high pressure turbine by control system analysis bypass.
In the prior art, the unit starting initial stage, bypass pressure setting value is a smaller definite value, along with boiler main steam pressure parameter improves, bypass pressure setting value is followed actual main steam pressure with given pace and is changed, and following criterion is that actual main steam pressure is greater than bypass pressure setting value.Now bypass pressure control mode is closed-loop automatic control mode, and control deviation is eliminated in PID (correcting unit) loop.When pressure before machine reaches after steam turbine red switch pressure, bypass pressure controls to transfer constant DP control to, maintains red switch pressure.In main steam condition intensification, boost process, in order to prevent the excessive unfavorable rolling parameter of bypass pitch aperture from improving, bypass pitch is carried out amplitude limit.
It is single, delayed that the disadvantage of above-mentioned Bypass Control strategy is that bypass pressure setting value follows criterion, the bad adaptability when unit operating mode changes, Automatic adjusument cannot be carried out according to the actual conditions of unit, bypass pressure setting value degree of accuracy is low, and then extend unit starting and rush the car time, reduce unit operation efficiency.
Summary of the invention
Embodiments provide a kind of defining method of bypass pressure setting value, to improve adaptability, the degree of accuracy of bypass pressure setting value.The method comprises: according to the real-time process variable of Bypass Control System, adopts the prediction algorithm of state observer to predict variation tendency and the rate of change of the main steam pressure of Bypass Control System, the variation tendency of main steam temperature and rate of change; According to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate bypass pressure setting value given function; By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value given function, calculate bypass pressure setting value.
In one embodiment, the real-time process variable of described Bypass Control System comprises: drum pressure, drum temperature, main steam pressure, main steam temperature, governor motion aperture one of them or wherein combination in any.
In one embodiment, also comprise: according to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate the given rate function of bypass pressure setting value; By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input the given rate function of described bypass pressure setting value, the rate of change of the bypass pressure setting value that prediction unit runs under different operating mode; According to the bypass pressure setting value that the rate of change Adjustable calculation of described bypass pressure setting value obtains.
In one embodiment, also comprise: according to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate bypass pressure setting value and follow criterion function; By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value and follow criterion function, prediction bypass pressure setting value is followed main steam pressure change and carries out the parameter that changes; According to the bypass pressure setting value that described parameter adjustment calculates.
In one embodiment, also comprise: according to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate bypass pitch amplitude limit given function; By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pitch amplitude limit given function, prediction bypass pitch restriction aperture.
The embodiment of the present invention additionally provides a kind of determining device of bypass pressure setting value, to improve adaptability, the degree of accuracy of bypass pressure setting value.This device comprises: prediction module, for the real-time process variable according to Bypass Control System, adopt variation tendency and the rate of change of the main steam pressure of the prediction algorithm prediction Bypass Control System of state observer, the variation tendency of main steam temperature and rate of change; Function computation module, for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pressure setting value given function; Bypass pressure preset value calculation module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, inputs described bypass pressure setting value given function, calculates bypass pressure setting value.
In one embodiment, the real-time process variable of described Bypass Control System comprises: drum pressure, drum temperature, main steam pressure, main steam temperature, governor motion aperture one of them or wherein combination in any.
In one embodiment, described function computation module, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate the given rate function of bypass pressure setting value; Described device also comprises: change rate forecast module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input the given rate function of described bypass pressure setting value, the rate of change of prediction bypass pressure setting value; Bypass pressure setting value adjusting module, for the bypass pressure setting value obtained according to the rate of change Adjustable calculation of described bypass pressure setting value.
In one embodiment, described function computation module, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pressure setting value and follow criterion function; Described device also comprises: criterion running parameter prediction module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value and follow criterion function, prediction bypass pressure setting value is followed main steam pressure change and carries out the parameter that changes; Described bypass pressure setting value adjusting module, the bypass pressure setting value also for calculating according to described parameter adjustment.
In one embodiment, described function computation module, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pitch amplitude limit given function; Described device also comprises: bypass pitch restriction aperture prediction module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pitch amplitude limit given function, prediction bypass pitch restriction aperture.
In embodiments of the present invention, by the real-time process variable according to Bypass Control System, the prediction algorithm of state observer is adopted to predict variation tendency and the rate of change of the main steam pressure of Bypass Control System, the variation tendency of main steam temperature and rate of change, and calculate bypass pressure setting value according to the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, owing to predicting that the variation tendency of main steam pressure of Bypass Control System and the variation tendency of rate of change and main steam temperature and the basis of rate of change are the real-time process variable of Bypass Control System, with prior art, the criterion of following of bypass pressure setting value is that the situation that actual main steam pressure is greater than bypass pressure setting value is compared, the degree of accuracy of bypass pressure setting value can be improved, the actual conditions that also can improve bypass pressure setting value random groups carry out adaptive adaptability, and then optimize the control strategy of Bypass Control System, shorten unit starting and rush the car time, improve unit operation efficiency.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the process flow diagram of the defining method of a kind of bypass pressure setting value that the embodiment of the present invention provides;
Fig. 2 is the embody rule schematic diagram of the defining method of a kind of bypass pressure setting value that the embodiment of the present invention provides;
Fig. 3 is the structured flowchart of the determining device of a kind of bypass pressure setting value that the embodiment of the present invention provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.
In embodiments of the present invention, provide a kind of defining method of bypass pressure setting value, as shown in Figure 1, the method comprises:
Step 101: according to the real-time process variable of Bypass Control System, adopts the prediction algorithm of state observer to predict variation tendency and the rate of change of the main steam pressure of Bypass Control System, the variation tendency of main steam temperature and rate of change;
Step 102: according to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate bypass pressure setting value given function, this bypass pressure setting value given function is used for according to the variation tendency of main steam pressure and rate of change, the variation tendency of main steam temperature and rate of change, the practical operation situation of Bypass Control System and bypass operation characteristic, calculate bypass pressure setting value, initial pressure set value can be provided according to the practical operation situation of Bypass Control System, then, according to variation tendency and the rate of change of main steam pressure, the variation tendency of main steam temperature and rate of change, the practical operation situation of Bypass Control System and bypass operation characteristic calculate dynamic bypass pressure setting value.When the application proposes bypass pressure setting value given function, those skilled in the art know and how to utilize prior art to calculate bypass pressure setting value given function according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, and the concrete form of the application to bypass pressure setting value given function does not limit.
Step 103: by the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value given function, calculates bypass pressure setting value.
Flow process is as shown in Figure 1 known, in embodiments of the present invention, by the real-time process variable according to Bypass Control System, state observer prediction algorithm is adopted to predict variation tendency and the rate of change of the main steam pressure of Bypass Control System, the variation tendency of main steam temperature and rate of change, and calculate bypass pressure setting value according to the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, owing to predicting that the variation tendency of main steam pressure of Bypass Control System and the variation tendency of rate of change and main steam temperature and the basis of rate of change are the real-time process variable of Bypass Control System, with prior art, the criterion of following of bypass pressure setting value is that the situation that actual main steam pressure is greater than bypass pressure setting value is compared, the degree of accuracy of bypass pressure setting value can be improved, the actual conditions that also can improve bypass pressure setting value random groups carry out adaptive adaptability, and then optimize the control strategy of Bypass Control System, shorten unit starting and rush the car time, improve unit operation efficiency.
During concrete enforcement, in order to effectively improve degree of accuracy and the adaptability of bypass pressure setting value, in the present embodiment, the real-time process variable of above-mentioned Bypass Control System comprises: drum pressure, drum temperature, main steam pressure, main steam temperature, governor motion aperture one of them or wherein combination in any.Concrete, by the real-time process variable input state observer prediction algorithm of above-mentioned Bypass Control System, the reference model of Bypass Control System can be doped, the important indicator such as variation tendency and rate of change of main steam pressure, temperature can be obtained, so that as the important references of the relevant given functions such as bypass pressure setting value according to this reference model.
In order to improve the adaptability that bypass pressure setting value random groups is run under different operating mode, in the present embodiment, said method also comprises: according to variation tendency and the rate of change of the main steam pressure of prediction, the variation tendency of main steam temperature and rate of change, the practical operation situation of Bypass Control System and bypass operation characteristic, (output of the given rate function of this bypass pressure setting value is for representing the rate of change of bypass pressure setting value to calculate the given rate function of bypass pressure setting value, when the application proposes the given rate function of bypass pressure setting value, those skilled in the art know and how to utilize prior art according to the variation tendency of main steam pressure and rate of change, the variation tendency of main steam temperature and rate of change, the practical operation situation of Bypass Control System and bypass operation characteristic calculate the given rate function of bypass pressure setting value, the concrete form of the application to the given rate function of bypass pressure setting value does not limit), by the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input the given rate function of described bypass pressure setting value, the rate of change of the bypass pressure setting value that prediction unit runs under different operating mode, and according to the bypass pressure setting value that the rate of change Adjustable calculation of described bypass pressure setting value obtains.Because the steam turbine of unit under different operating mode (cold conditions, warm state, hot, very hot state) starts or when a certain particular state starts, capital produces different impacts to main steam condition due to concrete unit operation operating mode, the bypass pressure setting value that Adjustable calculation obtains is carried out, the requirement under making bypass pressure setting value effectively can adapt to different operating mode by the rate of change of prediction bypass pressure setting value.
In order to ensure that boiler main steam parameter heats up, the rapidity of boosting, ride comfort and stability, in the present embodiment, said method also comprises: according to variation tendency and the rate of change of the main steam pressure of prediction, the variation tendency of main steam temperature and rate of change, the practical operation situation of Bypass Control System and bypass operation characteristic, calculating bypass pressure setting value follows criterion function, and (this bypass pressure setting value follows the output of criterion function for representing the difference between the bypass pressure setting value of calculating and the bypass pressure setting value recorded in real time, this difference represents when the bypass pressure setting value of calculating follows main steam pressure change, when main steam pressure change is followed in stopping.The application propose bypass pressure setting value follow criterion function time, those skilled in the art know and how to utilize prior art to calculate bypass pressure setting value according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic to follow criterion function, and the application does not limit the concrete form that bypass pressure setting value follows criterion function); By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value and follow criterion function, prediction bypass pressure setting value is followed main steam pressure change and carries out the parameter that changes; And according to the bypass pressure setting value that described parameter adjustment calculates.Concrete, boiler main steam parameter heats up, boost but do not reach in rolling parameter process, bypass pressure setting value is followed main steam pressure change and changes, give prediction bypass pressure setting value by prediction to follow main steam pressure change and carry out the parameter that changes (such as, when bypass pressure setting value follows main steam pressure change, when main steam pressure change is followed in stopping, specifically follow main steam pressure change and carry out the parameters such as the numerical value changed), adjust bypass pressure setting value in time, can ensure that boiler main steam parameter heats up, the rapidity of boosting, ride comfort and stability.
During concrete enforcement, better current working is mated in order to make bypass pressure setting value, in the present embodiment, also predict bypass pitch restriction aperture, concrete, said method also comprises: according to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, (output of this bypass pitch amplitude limit given function is for representing the real-time aperture of bypass pitch to calculate bypass pitch amplitude limit given function.When the application proposes bypass pitch amplitude limit given function, those skilled in the art know and how to utilize prior art to calculate bypass pitch amplitude limit given function according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, and the concrete form of the application to bypass pitch amplitude limit given function does not limit); By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pitch amplitude limit given function, prediction bypass pitch restriction aperture, realize adjusting according to real-time condition the bypass pitch restriction aperture adapting to current working, affect red switch pressure and temp to set up to prevent bypass pitch aperture in adjustment process excessive, better current working is mated to make bypass pressure setting value, shorten main steam condition heat up, boosting needed for time, improve unit starting efficiency.When bypass pressure reaches red switch pressure, this slicing circuit resets.
The defining method describing above-mentioned bypass pressure setting value below in conjunction with concrete example in detail is incorporated into the applicable cases that bypass pressure setting value generates loop.As shown in Figure 2, the part in black line frame is for realizing the part of the determination methodological function of above-mentioned bypass pressure setting value, and concrete application process is as follows:
(1) using the input variable of the procedure parameters such as drum pressure, drum temperature, main steam pressure, main steam temperature, bypass governor motion aperture as prediction algorithm, the variation tendency of main steam temperature and the variation tendency of rate of change and main steam pressure and rate of change is doped fast and accurately by the prediction algorithm based on state observer.
(2) according to the variation tendency of main steam temperature that dopes and the variation tendency of rate of change and main steam pressure and rate of change, calculate bypass pressure setting value given function by System Discrimination (i.e. the practical operation situation of Bypass Control System) and bypass operation characteristic, the given rate function of bypass pressure setting value, bypass pressure setting value follow criterion function, bypass pitch amplitude limit given function, obtain reference model.
(3) as shown in Figure 2, by prediction algorithm, adaptive algorithm and related function carry out Logical Configuration, being incorporated into bypass pressure setting value generates in loop, doping bypass pressure by bypass pressure reference model is ym (t), simultaneously, the bypass pressure recorded in real time is y (t), calculating ym (t) with the difference of y (t) is e (t), bypass pressure setting value is calculated by bypass pressure setting value given function, calculated the parameter of main steam pressure control device in real time according to e (t) by adaptive algorithm, main steam pressure control device is adjusted by parameter, calculated the correction deviation of the aperture r (t) revising bypass pitch in real time according to e (t) by the given adaptive algorithm of bypass pressure setting value simultaneously, the aperture of bypass pitch is adjusted in real time according to this correction deviation.
(4) carry out the test of bypass pressure control system STATIC SIMULATION, check correctness and the accuracy of control loop.
(5) carry out bypass pressure control system dynamic test, test under the operating modes such as cold conditions, warm state, hot, very hot state, adjusting and optimization correlation parameter.
Based on same inventive concept, additionally provide a kind of determining device of bypass pressure setting value in the embodiment of the present invention, as described in the following examples.The principle of dealing with problems due to the determining device of bypass pressure setting value is similar to the defining method of bypass pressure setting value, therefore the enforcement of the determining device of bypass pressure setting value see the enforcement of the defining method of bypass pressure setting value, can repeat part and repeats no more.Following used, term " unit " or " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following examples preferably realizes with software, hardware, or the realization of the combination of software and hardware also may and conceived.
Fig. 3 is a kind of structured flowchart of the determining device of the bypass pressure setting value of the embodiment of the present invention, as shown in Figure 3, comprising: prediction module 301, function computation module 302 and bypass pressure preset value calculation module 303, be described this structure below.
Prediction module 301, for the real-time process variable according to Bypass Control System, adopts variation tendency and the rate of change of the main steam pressure of the prediction algorithm prediction Bypass Control System of state observer, the variation tendency of main steam temperature and rate of change;
Function computation module 302, be connected with prediction module 301, for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pressure setting value given function;
Bypass pressure preset value calculation module 303, function computing module 302 connects, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value given function, calculate bypass pressure setting value.
In one embodiment, the real-time process variable of described Bypass Control System comprises: drum pressure, drum temperature, main steam pressure, main steam temperature, governor motion aperture one of them or wherein combination in any.
In one embodiment, described function computation module 302, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate the given rate function of bypass pressure setting value; Described device also comprises: change rate forecast module, function computing module 302 connects, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input the given rate function of described bypass pressure setting value, the rate of change of prediction bypass pressure setting value; Bypass pressure setting value adjusting module, with change rate forecast model calling, for the bypass pressure setting value obtained according to the rate of change Adjustable calculation of described bypass pressure setting value.
In one embodiment, described function computation module 302, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pressure setting value and follow criterion function; Described device also comprises: criterion running parameter prediction module, function computing module 302 connects, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value and follow criterion function, prediction bypass pressure setting value is followed main steam pressure change and carries out the parameter that changes; Described bypass pressure setting value adjusting module, is connected with criterion running parameter prediction module, the bypass pressure setting value also for calculating according to described parameter adjustment.
In one embodiment, described function computation module 302, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pitch amplitude limit given function; Described device also comprises: bypass pitch restriction aperture prediction module, function computing module 302 connects, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pitch amplitude limit given function, prediction bypass pitch restriction aperture.
In embodiments of the present invention, by the real-time process variable according to Bypass Control System, state observer prediction algorithm is adopted to predict variation tendency and the rate of change of the main steam pressure of Bypass Control System, the variation tendency of main steam temperature and rate of change, and calculate bypass pressure setting value according to the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, owing to predicting that the variation tendency of main steam pressure of Bypass Control System and the variation tendency of rate of change and main steam temperature and the basis of rate of change are the real-time process variable of Bypass Control System, with prior art, the criterion of following of bypass pressure setting value is that the situation that actual main steam pressure is greater than bypass pressure setting value is compared, the degree of accuracy of bypass pressure setting value can be improved, the actual conditions that also can improve bypass pressure setting value random groups carry out adaptive adaptability, and then optimize the control strategy of Bypass Control System, shorten unit starting and rush the car time, improve unit operation efficiency.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the embodiment of the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a defining method for bypass pressure setting value, is characterized in that, comprising:
According to the real-time process variable of Bypass Control System, the prediction algorithm of state observer is adopted to predict variation tendency and the rate of change of the main steam pressure of Bypass Control System, the variation tendency of main steam temperature and rate of change;
According to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate bypass pressure setting value given function;
By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value given function, calculate bypass pressure setting value.
2. the defining method of bypass pressure setting value as claimed in claim 1, it is characterized in that, the real-time process variable of described Bypass Control System comprises: drum pressure, drum temperature, main steam pressure, main steam temperature, governor motion aperture one of them or wherein combination in any.
3. the defining method of bypass pressure setting value as claimed in claim 1 or 2, is characterized in that, also comprise:
According to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate the given rate function of bypass pressure setting value;
By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input the given rate function of described bypass pressure setting value, the rate of change of the bypass pressure setting value that prediction unit runs under different operating mode;
According to the bypass pressure setting value that the rate of change Adjustable calculation of described bypass pressure setting value obtains.
4. the defining method of bypass pressure setting value as claimed in claim 3, is characterized in that, also comprise:
According to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate bypass pressure setting value and follow criterion function;
By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value and follow criterion function, prediction bypass pressure setting value is followed main steam pressure change and carries out the parameter that changes;
According to the bypass pressure setting value that described parameter adjustment calculates.
5. the defining method of bypass pressure setting value as claimed in claim 4, is characterized in that, also comprise:
According to practical operation situation and the bypass operation characteristic of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System, calculate bypass pitch amplitude limit given function;
By the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pitch amplitude limit given function, prediction bypass pitch restriction aperture.
6. a determining device for bypass pressure setting value, is characterized in that, comprising:
Prediction module, for the real-time process variable according to Bypass Control System, adopts variation tendency and the rate of change of the main steam pressure of the prediction algorithm prediction Bypass Control System of state observer, the variation tendency of main steam temperature and rate of change;
Function computation module, for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pressure setting value given function;
Bypass pressure preset value calculation module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, inputs described bypass pressure setting value given function, calculates bypass pressure setting value.
7. the determining device of bypass pressure setting value as claimed in claim 6, it is characterized in that, the real-time process variable of described Bypass Control System comprises: drum pressure, drum temperature, main steam pressure, main steam temperature, governor motion aperture one of them or wherein combination in any.
8. the determining device of bypass pressure setting value as claimed in claims 6 or 7, it is characterized in that, described function computation module, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate the given rate function of bypass pressure setting value;
Described device also comprises:
Change rate forecast module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, inputs the given rate function of described bypass pressure setting value, the rate of change of prediction bypass pressure setting value;
Bypass pressure setting value adjusting module, for the bypass pressure setting value obtained according to the rate of change Adjustable calculation of described bypass pressure setting value.
9. the determining device of bypass pressure setting value as claimed in claim 8, it is characterized in that, described function computation module, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pressure setting value and follow criterion function;
Described device also comprises:
Criterion running parameter prediction module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, input described bypass pressure setting value and follow criterion function, prediction bypass pressure setting value is followed main steam pressure change and carries out the parameter that changes;
Described bypass pressure setting value adjusting module, the bypass pressure setting value also for calculating according to described parameter adjustment.
10. the determining device of bypass pressure setting value as claimed in claim 9, it is characterized in that, described function computation module, also for according to the practical operation situation of the variation tendency of the variation tendency of main steam pressure of prediction and rate of change, main steam temperature and rate of change, Bypass Control System and bypass operation characteristic, calculate bypass pitch amplitude limit given function;
Described device also comprises:
Bypass pitch restriction aperture prediction module, for will the variation tendency of main steam pressure of prediction and the variation tendency of rate of change and main steam temperature and rate of change, inputs described bypass pitch amplitude limit given function, prediction bypass pitch restriction aperture.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510160459.2A CN104793656B (en) | 2015-04-07 | 2015-04-07 | The determination method and device of bypass pressure setting value |
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