CN113311701A - Boiler master control feedforward compensation method under main steam pressure deviation locking working condition of thermal power generating unit - Google Patents
Boiler master control feedforward compensation method under main steam pressure deviation locking working condition of thermal power generating unit Download PDFInfo
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Abstract
The invention discloses a boiler main control feedforward compensation method under the main steam pressure deviation locking working condition of a thermal power generating unit, which aims at the inherent large delay and large inertia characteristics of the boiler powder making, combustion and heat transfer processes of the unit, particularly under the abnormal working condition of a combustion system, such as coal break, untimely start and stop of a coal mill, sudden change of coal quality and the like, the abnormal fluctuation of the main steam pressure is caused, under the load locking working condition with large main steam pressure deviation, a boiler feedforward algorithm is optimized, the defects of the existing load dynamic feedforward method are overcome, by setting a boiler main control load dynamic feedforward slow adjustment function, a boiler main control feedforward compensation quantity under the locking working condition is overlapped to form a boiler main control total feedforward to compensate the required coal feeding quantity, and the situation that the boiler main control reverse action is continuously deteriorated due to the load dynamic feedforward quantity adjustment under the load instruction locking condition is prevented, the locking working condition is eliminated quickly, and the recovery performance of the abnormal working condition in the load dynamic response process of the thermal power generating unit is improved.
Description
Technical Field
The invention relates to the field of boiler main control feedforward of a thermal power unit coordinated control system, in particular to a control method for optimizing the boiler main control feedforward under the working condition of large main steam pressure deviation and locked load of the thermal power unit.
Background
With the higher requirement of power grid dispatching on the AGC adjusting function of the thermal power generating unit, the unit sets a higher variable load rate for quickly responding to the load instruction of the AGC, and a similar load dynamic feedforward method is generally adopted in the existing boiler main control feedforward control strategy to ensure the quickness of the unit in responding to the load, as detailed in patent CN 106249589B. However, due to the inherent characteristics of large delay and large inertia in the processes of pulverizing, burning and heat transfer of the boiler, the main steam pressure fluctuates abnormally especially under the abnormal working conditions of the combustion system, such as coal break, untimely start and stop of the coal mill, sudden change of the coal quality and the like. In the existing coordination control strategy, a function of locking and increasing and decreasing a load instruction when the main steam pressure deviation is large is arranged, and a steam turbine keeps the current load to prevent the main steam pressure deviation from further worsening to cause the coordination control to quit so as to quit AGC. However, in the control algorithm of the boiler master control feedforward, the load instruction is used as an important input parameter, after the load instruction is locked, the load dynamic feedforward is quickly adjusted back, the PID integral effect of the boiler master control cannot compensate the adjustment back quantity of the dynamic feedforward, so that the coal supply quantity changes towards the direction of deteriorating the main steam pressure parameter, and the main steam pressure deviation is easily adjusted back slowly or even continuously deteriorated under the load locking working condition, so that the condition that the coordinated control mode exits is achieved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art in practical application, and provides a boiler main control feedforward compensation method under the working condition of main steam pressure deviation locking of a thermal power generating unit.
The technical scheme adopted by the invention for solving the problems is as follows: a boiler main control feedforward compensation method under a thermal power generating unit main steam pressure deviation locking working condition is characterized in that under the working condition that a main steam pressure deviation large locking load instruction occurs in a unit and no target load reversely exceeds a load instruction, a slow adjusting back function is arranged on the basis of a boiler main control feedforward FF to form a slow returning feedforward FF', and meanwhile, a boiler main control feedforward compensation amount FFadd under the locking working condition is arranged according to the target load, the load instruction deviation and the pressure deviation value to be superposed to an existing boiler main control feedforward, specifically FFGeneral assembly＝FF'+FFadd。
The triggering and resetting of the boiler master control feedforward compensation method under the working condition of main steam pressure blocking load are realized through the following steps:
s01: selecting a main steam pressure deviation delta Pr, a target load Ptar and a load instruction Pset as a triggering and resetting condition reference signal of a compensation algorithm, wherein the main steam pressure deviation delta Pr is equal to a main steam pressure set value SPr-a main steam pressure real-time value Pr;
s02: setting PrI, PrI ', PrD and PrD' as main steam pressure deviation fixed values of load increasing locking compensation triggering, load increasing locking compensation resetting, load reducing locking compensation triggering and load reducing locking compensation resetting, wherein the setting range of PrI is 0.5-0.8, the setting range of PrD is-0.8-0.5, PrI 'is 0.1-0.2 smaller than PrI, and PrD' is 0.1-0.2 larger than PrD;
s03: the target load is reversely judged under the locking working condition, and the target load is specifically: delta Pr is more than or equal to PrI and Ptar is more than Pset; the locking reducing working condition load is reversed, and the method specifically comprises the following steps: Δ Pr is less than or equal to PrD and Ptar is less than Pset;
s04: the main control feedforward compensation algorithm triggering conditions of the locked load-increasing boiler are as follows: delta Pr is more than or equal to PrI;
s05: the main control feedforward compensation algorithm resetting conditions of the locked load-increasing boiler are as follows: delta Pr is less than or equal to PrI' or the target load is reversed;
s06: the main control feedforward compensation algorithm triggering conditions of the locked load-reducing boiler are as follows: delta Pr is less than or equal to PrD;
s07: the main control feedforward compensation algorithm resetting conditions of the locked load-reducing boiler are as follows: delta Pr is more than or equal to PrD' or the target load is reversed;
the boiler main control slow-return feedforward FF' is realized by an inertia hysteresis function by taking the boiler main control feedforward FF as an input signal, and the function is specifically as follows:
wherein lag (FF, T)g) Is an inertial element with variable inertial time constant and transfer function of
The input signal is FF, S is Laplace transform operator, TgThe magnitude of the adjustable inertia time constant can adjust the rate of change of FF'.
The boiler master control feedforward compensation quantity FFadd under the locking working condition is obtained through the following steps:
s11: the compensation amount FFadd is determined by the product of the compensation reference amount Bac and the coefficient M;
s12: the compensation reference quantity Bac is input by the sum of the main steam pressure deviation delta Pr multiplied by a coefficient a and the pressure deviation differential d delta Pr multiplied by a coefficient b and is subjected to a continuous piecewise linear function f2(a × Δ Pr + b × d Δ Pr), specifically:
when a and b are adjustable coefficients, the positive and negative of Bac are determined by a multiplied by delta Pr + b multiplied by d delta Pr;
s13: the coefficient M is a continuous piecewise linear function f from the load and current load instruction deviation value delta P1(Δ P) was obtained, specifically: m ═ f1(Δ P) where the load-to-current load command deviation value Δ P is equal to target load Ptar-load command Pset;
s14: the boiler master control feedforward compensation quantity FFadd under the locking working condition is specifically as follows:
FFadd＝lag[Bac×M，TG]
wherein lag [ Bac × M, TG]Is an inertial element with variable inertial time constant and transfer function of
Its input signal is Bac × M, S is Laplace transform operator, TGThe adjustable inertia time constant is set, and the change rate of the main control feed-forward compensation quantity of the boiler can be adjusted according to the size of the adjustable inertia time constant.
Compared with the prior art, the invention has the following advantages and effects: under the working conditions of large main steam pressure deviation locking increase and load reduction, dynamic feedforward callback of boiler load is slowed down, and boiler main control feedforward compensation components under the locking working condition are superposed according to the main steam pressure deviation and the difference value of target load and load instruction, so that the situation that the main control reverse action of a boiler continuously deteriorates the main steam pressure of the unit due to the callback of the load dynamic feedforward components is prevented, the locking working condition is quickly eliminated, and the quick recovery performance under the abnormal working condition in the load dynamic response process of the thermal power unit is improved.
Drawings
FIG. 1 is a schematic flow chart of a method in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1, in this embodiment, in the boiler master control feedforward compensation method under the main steam pressure deviation lockout condition of the thermal power generating unit, under the main steam pressure deviation large lockout load instruction condition, a triggering and resetting algorithm of the boiler master control feedforward compensation is set, and on the basis of an original load dynamic feedforward FF, a load dynamic feedforward slow-adjustment function is set to generate an FF', and simultaneously, a lockout condition boiler master control feedforward compensation component FFadd is superimposed to form a boiler master control total feedforward FFGeneral assemblyThe calculation method is as follows:
the triggering and resetting algorithm of the main control feedforward compensation of the boiler is obtained by the following steps:
s01: calculating main steam pressure deviation delta Pr which is equal to a main steam pressure set value SPr-main steam pressure Pr, and calculating load deviation delta P which is equal to a target load Ptar-load instruction Pset;
s02: when delta P is more than 0.01, the load increasing state is triggered, when delta P is less than-0.01, the load decreasing state is triggered, PrI is 0.6, PrI 'is 0.4, PrD is-0.6 and PrD' is-0.4 are respectively set, when delta Pr is more than 0.6, the load increasing locking is triggered, when delta Pr is less than-0.6, the load decreasing locking is triggered, when delta Pr is more than-0.4, the load decreasing locking is reset, and when delta Pr is less than 0.4, the load increasing locking is reset;
s03: the method comprises the following steps of setting target load reverse judgment logic under a locking working condition, wherein the target load reverse judgment logic specifically comprises the following steps: when the load is in the increasing and locking state, Ptar is less than Pset, and the increasing and locking load reverse state is triggered; when the load is in a load reduction and locking state, Ptar is larger than Pset, and a load reverse state of the reduction and locking state is triggered;
s04: the triggering conditions of the main control feed-forward compensation of the boiler are as follows: load increasing or load reducing lockout;
s05: the main control feedforward compensation reset condition of the boiler is as follows: load increasing locking or load reducing locking or load increasing locking reverse direction or load reducing locking reverse direction;
and the load dynamic feedforward FF is slowly adjusted back after passing through the Lag functional block under the triggering condition of the boiler main control feedforward compensation to obtain FF ', the Lag parameter Tg of the Lag functional block is 60s, and the FF' is FF under the resetting condition of the boiler main control feedforward compensation.
The main control feedforward compensation component FFadd of the boiler is obtained by the main steam pressure deviation delta Pr and the load deviation delta P through the following steps:
s11: the main steam pressure deviation delta Pr multiplied by the coefficient K is 0.8, the differential of the main steam pressure deviation delta Pr multiplied by the coefficient K is 0.5, wherein the differential time t is 10s, and the sum of the two is used as a continuous piecewise linear function f1(x) Outputting as a compensation reference quantity Bac;
s12: the load deviation Δ P is passed through a continuous piecewise linear function f2(x) Outputting as a compensation coefficient M;
s13: selecting BacxM through a switching function block under the triggering condition of the main control feedforward compensation of the boiler;
s14: selecting 0 through a switching function block under the triggering condition of the main control feedforward compensation of the boiler;
s15: the main control feedforward compensation component FFadd of the closed-condition boiler is the output value of the switching block after the output value passes through the Lag function block, and the delay parameter TG＝60s。
Main control total feedforward FF of boilerGeneral assembly＝FF’+FFadd。
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. A boiler main control feedforward compensation method under a thermal power generating unit main steam pressure deviation locking working condition is characterized in that under the working condition that a main steam pressure deviation large locking load instruction occurs in a unit and no target load reversely exceeds a load instruction, a slow adjusting back function is arranged on the basis of a boiler main control feedforward FF to form a slow returning feedforward FF', and meanwhile, a boiler main control feedforward compensation amount FFadd under the locking working condition is arranged according to the target load, the load instruction deviation and the pressure deviation value to be superposed to an existing boiler main control feedforward, specifically FFGeneral assembly＝FF'+FFadd。
2. The main control feed-forward compensation method of the boiler under the main steam pressure deviation locking working condition of the thermal power generating unit according to claim 1, wherein the triggering and resetting of the main control feed-forward compensation method of the boiler under the main steam pressure locking load working condition are realized through the following steps:
s01: selecting a main steam pressure deviation delta Pr, a target load Ptar and a load instruction Pset as a triggering and resetting condition reference signal of a compensation algorithm, wherein the main steam pressure deviation delta Pr is equal to a main steam pressure set value SPr-a main steam pressure real-time value Pr;
s02: setting PrI, PrI ', PrD and PrD' as main steam pressure deviation fixed values of load increasing locking compensation triggering, load increasing locking compensation resetting, load reducing locking compensation triggering and load reducing locking compensation resetting, wherein the setting range of PrI is 0.5-0.8, the setting range of PrD is-0.8-0.5, PrI 'is 0.1-0.2 smaller than PrI, and PrD' is 0.1-0.2 larger than PrD;
s03: the target load is reversely judged under the locking working condition, and the target load is specifically: delta Pr is more than or equal to PrI and Ptar is more than Pset; the locking reducing working condition load is reversed, and the method specifically comprises the following steps: Δ Pr is less than or equal to PrD and Ptar is less than Pset;
s04: the main control feedforward compensation algorithm triggering conditions of the locked load-increasing boiler are as follows: delta Pr is more than or equal to PrI;
s05: the main control feedforward compensation algorithm resetting conditions of the locked load-increasing boiler are as follows: delta Pr is less than or equal to PrI' or the target load is reversed;
s06: the main control feedforward compensation algorithm triggering conditions of the locked load-reducing boiler are as follows: delta Pr is less than or equal to PrD;
s07: the main control feedforward compensation algorithm resetting conditions of the locked load-reducing boiler are as follows: delta Pr is greater than or equal to PrD' or the target load is reversed.
3. The boiler main control feedforward compensation method under the main steam pressure deviation locking working condition of the thermal power generating unit according to claim 2, wherein the boiler main control slow-return feedforward FF' function with the boiler main control feedforward FF as an input signal is realized by an inertia hysteresis function, which is specifically as follows:
wherein lag (FF, T)g) Is an inertial element with variable inertial time constant and transfer function of
The input signal is FF, S is Laplace transform operator, TgThe magnitude of the adjustable inertia time constant can adjust the rate of change of FF'.
4. The main control feedforward compensation method of the boiler under the thermal power generating unit main steam pressure deviation locking working condition according to claim 3, wherein the main control feedforward compensation amount FFadd of the boiler under the locking working condition is obtained through the following steps:
s11: the compensation amount FFadd is determined by the product of the compensation reference amount Bac and the coefficient M;
s12: the compensation reference quantity Bac is input by the sum of the main steam pressure deviation delta Pr multiplied by a coefficient a and the pressure deviation differential d delta Pr multiplied by a coefficient b and is subjected to a continuous piecewise linear function f2(a × Δ Pr + b × d Δ Pr), specifically:
when a and b are adjustable coefficients, the positive and negative of Bac are determined by a multiplied by delta Pr + b multiplied by d delta Pr;
s13: the coefficient M is a continuous piecewise linear function f from the load and current load instruction deviation value delta P1(Δ P) was obtained, specifically: m ═ f1(Δ P) where the load-to-current load command deviation value Δ P is equal to target load Ptar-load command Pset;
s14: the boiler master control feedforward compensation quantity FFadd under the locking working condition is specifically as follows:
FFadd＝lag[Bac×M，TG]
wherein lag [ Bac × M, TG]Is an inertial element with variable inertial time constant and transfer function of
Its input signal is Bac × M, S is Laplace transform operator, TGThe adjustable inertia time constant is set, and the change rate of the main control feed-forward compensation quantity of the boiler can be adjusted according to the size of the adjustable inertia time constant.
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