CN106287659A - Reheat steam temperature degree control method and device - Google Patents

Abstract

The present invention relates to thermal control process field, disclose a kind of reheat steam temperature degree control method and device, the method comprise the steps that and receive spray desuperheating to the controlled quentity controlled variable of reheat steam temperature degree, gas baffle to the controlled quentity controlled variable of reheat steam temperature degree and the burner controlled quentity controlled variable to reheat steam temperature degree；According to described spray desuperheating, controlled quentity controlled variable, the gas baffle of reheat steam temperature degree are exported the temperature value of subsequent time to controlled quentity controlled variable and the burner of reheat steam temperature degree to the controlled quentity controlled variable of reheat steam temperature degree by the temperature prediction model of described reheat steam temperature degree；And determine that according to the difference between temperature value and the preset value of this subsequent time of described subsequent time the controlled quentity controlled variable that should apply is to control described reheat steam temperature degree.System is applied control action reheat steam temperature degree can be effectively ensured by the controlled quentity controlled variable that should apply according to this calculating meet system requirements.

Description

Reheat steam temperature degree control method and device

Technical field

The present invention relates to thermal control process field, in particular it relates to a kind of reheat steam temperature degree control method and device.

Background technology

The reheat steam temperature degree of station boiler is one of important parameter of unit safety, economical operation.Reheat steam temperature degree is higher, Ability to bear close to material, it is easy to booster；Temperature is on the low side, then directly reduce the business efficiency of unit.

The method of temperature control of reheater is mainly regulated by burner pivot angle, gas baffle regulation control common with water spray regulation System, the specific works principle of these three mode is as follows:

(1) burner pivot angle regulation: Fig. 1 shows the structural representation of burner.As it is shown in figure 1, in burner 10 from Under supreme be broadly divided into three districts: primary combustion zone 11, again combustion zone 13, burning-out zone 13, can be adjusted by tilting burner Flame kernel, thus change reheater and be heated situation to change reheater outlet temperature；

(2) gas baffle regulation: Fig. 2 shows boiler back end ductwork structural representation.As in figure 2 it is shown, boiler tail cigarette Road comprises 2 flues arranged side by side (reheater flue and superheater flue), wherein includes low-temperature reheater in reheater flue 21 and economizer 22, superheater flue includes primary superheater 23 and economizer 24.Economizer 22 He that cigarette temperature is relatively low 24 arrange controllable gas baffle 25 and 26 separately below, in gas baffle 25 in reheater flue and superheater flue Gas baffle 26 interoperation, changes the flue gas flow flowing through reheater flue, thus controls the temperature of reheating vapour.

(3) water spray regulation: Fig. 3 shows the scheme of installation of water injector.As it is shown on figure 3, low-temperature reheater 31 He The both sides of high temperature reheater 32 are provided with direct-contact desuperheater 33 and 34, and these two direct-contact desuperheaters 33 and 34 are jointly urgent in reply Spray water during accident.

Owing to water spray regulation can reduce the thermal efficiency of unit, therefore when properly functioning, it is desirable to water spray is zero.But, make Operation mostly can not be automatically engaged for the main regulating measure of reheat steam temperature degree, the regulation of burner pivot angle and gas baffle regulation, And homoiothermic is slow, for ensureing unit safety operation, still need to use water spray regulation as auxiliary adjustment means.And at present, The concrete execution action the most effectively adjusting above-mentioned three kinds of modes is still relatively difficult to realize.

The control of steam temperature overwhelming majority of large-sized boiler uses cas PID control mode at present.Many research worker propose Some Advanced Control Strategies, such as Self Adaptive Control, fuzzy control strategy etc..But these control strategies need operator to grasp greatly The advanced technology of amount, and be awkward in debugging, running, therefore do not come into operation in a large number.

Summary of the invention

It is an object of the invention to provide a kind of reheat steam temperature degree control method and device, it is possible to when effectively determining current Quarter should put on the control action of system.

To achieve these goals, the present invention provides a kind of reheat steam temperature degree control method, and the method includes: receive water spray Desuperheat to the controlled quentity controlled variable of reheat steam temperature degree, gas baffle to the controlled quentity controlled variable of reheat steam temperature degree and burner to reheat steam temperature degree Controlled quentity controlled variable；By the temperature prediction model of described reheat steam temperature degree according to described spray desuperheating to the controlled quentity controlled variable of reheat steam temperature degree, cigarette Gas baffle plate exports the temperature of subsequent time to controlled quentity controlled variable and the burner of reheat steam temperature degree to the controlled quentity controlled variable of reheat steam temperature degree Value；And the control that should apply is determined according to the difference between temperature value and the preset value of this subsequent time of described subsequent time Amount processed is to control described reheat steam temperature degree.

Correspondingly, the present invention also provides for the control device of a kind of reheat steam temperature degree, and this device includes: receiver module, is used for Receive spray desuperheating to the controlled quentity controlled variable of reheat steam temperature degree, gas baffle to the controlled quentity controlled variable of reheat steam temperature degree and burner to reheating The controlled quentity controlled variable of stripping temperature；Temperature value computing module, is used for by the temperature prediction model of described reheat steam temperature degree according to described water spray Desuperheat to the controlled quentity controlled variable of reheat steam temperature degree, gas baffle to the controlled quentity controlled variable of reheat steam temperature degree and burner to reheat steam temperature degree Controlled quentity controlled variable and export the temperature value of subsequent time；And controlled quentity controlled variable computing module, according to temperature value and this of described subsequent time Difference between the preset value of subsequent time determines that the controlled quentity controlled variable that should apply is to control described reheat steam temperature degree.

By technique scheme, set up the temperature prediction model of reheat steam temperature degree, then further according to temperature prediction model Output valve and current preset value between the anti-controlled quentity controlled variable that currently should apply of releasing of difference, and then according to this should apply control Amount processed applies control action and can ensure that reheat steam temperature degree meets system requirements and is unlikely higher or on the low side system.

Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool Body embodiment is used for explaining the present invention together, but is not intended that limitation of the present invention.In the accompanying drawings:

Fig. 1 shows the structural representation of burner；

Fig. 2 shows boiler back end ductwork structural representation；

Fig. 3 shows the scheme of installation of water injector；

Fig. 4 shows the flow chart of reheat steam temperature degree control method in an embodiment；

Fig. 5 shows the flow chart of reheat steam temperature degree control method in another embodiment；

Fig. 6 shows the ultimate principle figure that in another embodiment, reheat steam temperature degree controls；And

Fig. 7 shows the control apparatus structure block diagram of the reheat steam temperature degree that the present invention provides.

Description of reference numerals

10 burner pivot angle 11 primary combustion zone

12 combustion zone 13 burning-out zones again

21 low-temperature reheater 22,24 economizers

23 primary superheater 25,26 gas baffles

31 low-temperature reheater 32 high temperature reheaters

33,34 direct-contact desuperheater 41 receiver module

42 temperature value computing module 43 controlled quentity controlled variable computing modules

Detailed description of the invention

Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.

Fig. 4 shows the flow chart of reheat steam temperature degree control method in an embodiment.As shown in Figure 4, reheat steam temperature degree control Method processed may include that step S11, receives spray desuperheating to the controlled quentity controlled variable of reheat steam temperature degree, gas baffle to reheat steam temperature degree Controlled quentity controlled variable and the burner controlled quentity controlled variable to reheat steam temperature degree, these four controlled quentity controlled variables refer to that current time puts on reheating vapour Controlled quentity controlled variable size；Step S12, by the temperature prediction model of described reheat steam temperature degree according to described spray desuperheating to reheat steam temperature degree Controlled quentity controlled variable, gas baffle controlled quentity controlled variable and the burner of reheat steam temperature degree are exported next to the controlled quentity controlled variable of reheat steam temperature degree The temperature value in moment；And step S13, according to the difference between temperature value and the preset value of this subsequent time of described subsequent time Value determines that the controlled quentity controlled variable that should apply is to control described reheat steam temperature degree.

PREDICTIVE CONTROL is the class novel computer control method that developed recently gets up.It need not set up controlled device Accurate mathematical model, but utilize the computing capability of digital computer to carry out online rolling optimization and calculate, thus obtain Control effect.Develop multiple predictive control algorithm at present: have the propositions such as Richalet, Mehra, set up at nonparametric mould Model prediction on the basis of type impulse response inspires and controls (MPHC), or referred to as Model Algorithmic contral (MAC), and Culter etc. Propose, set up the dynamic matrix control (DMC) etc. on the basis of nonparametric model step response.Based on identification process parameter mould Type, and with self-correcting mechanism, the generalized predictive control of the Clarke of the predictive control algorithm of on-line amending model parameter (GPC), the Generalized Prediction pole placement control (GPP) etc. of Lelic.

Owing to the method for temperature control of reheater is mainly regulated with water spray regulation jointly by the regulation of burner pivot angle, gas baffle Controlling, therefore, temperature prediction model in step s 12 can be relevant to respective controlled quentity controlled variable in these three kinds of regulative modes.

It is possible to further initially set up the transmission function about each controlled quentity controlled variable Yu reheat steam temperature degree, then according to being somebody's turn to do Transfer function to set up temperature prediction model.

Alternatively, burner pivot angle-reheat steam temperature degree, gas baffle-reheat steam temperature degree and spray desuperheating-reheat steam temperature degree Transmission function can add the pure pattern delayed with one order inertia and be described:

$G\left(s\right)=\frac{K}{Ts+1}{e}^{-\mathrm{\τ}s}---\left(1\right)$

Wherein K is gain, and T is the one order inertia time, and τ is time delay, and s represents complex field.

As it is shown on figure 3, power plant's spray desuperheating is generally divided into both sides, can be designated as A side and B side, there is a water spray every side This side reheat steam temperature is controlled by attemperator, and gas baffle and burner have effect to both sides reheat steam temperature.Therefore about The temperature prediction model of controlled device can be represented by following formula:

$\left[\begin{array}{c}{\mathrm{\ΔY}}_a\\ {\mathrm{\ΔY}}_b\end{array}\right]=\left[\begin{array}{cccc}{G}_{11}& 0& G_{13}& G_{14}\\ 0& G_{22}& G_{23}& G_{24}\end{array}\right]\×\left[\begin{array}{c}{\mathrm{\ΔU}}_a\\ {\mathrm{\ΔU}}_b\\ {\mathrm{\ΔU}}_{gas}\\ {\mathrm{\ΔU}}_{Burner}\end{array}\right]---\left(2\right)$

Wherein, Δ Y_aFor A side reheat steam temperature degree, Δ Y_bFor B side reheat steam temperature degree, Δ U_aFor A side spray desuperheating to reheating vapour The controlled quentity controlled variable of temperature, Δ U_bFor the B side spray desuperheating controlled quentity controlled variable to reheat steam temperature degree, Δ U_gasFor gas baffle to reheat steam temperature The controlled quentity controlled variable of degree, Δ U_BurnerFor the burner controlled quentity controlled variable to reheat steam temperature degree.G₁₁、G₁₃、G₁₄It is respectively spray desuperheating, flue gas gear Plate, the burner pivot angle form in A side transmission function as shown in formula (1), G₂₂、G₂₃、G₂₄It is respectively spray desuperheating, flue gas Baffle plate, the burner pivot angle form in B side transmission function as shown in formula (1).

Formula (2) is a temperature prediction model about 4 input-2 outputs, and this temperature prediction model can be according to currently Each controlled quentity controlled variable in moment dopes the temperature of subsequent time reheating vapour, by the temperature of this subsequent time reheating vapour and this lower a period of time Carve predetermined temperature value to compare, according to the two difference, above-mentioned 4 inputs are carried out rolling optimization, and then calculate Go out current time and should put on the controlled quentity controlled variable size of system.

Fig. 5 shows the flow chart of reheat steam temperature degree control method in another embodiment.As shown in Figure 5, it is preferable that reheating Stripping temperature control method can also include: step S21, according to described temperature prediction model output current time temperature value with The actual temperature value of this current time determines error weights；Step S22, uses described error weights to described temperature prediction mould Type is modified；And step S23, according to the temperature value of the subsequent time of revised temperature prediction model output with this next Difference between the preset value in moment determines the described controlled quentity controlled variable that should apply.

So that the temperature prediction of reheating vapour is more accurate, can build respectively in the case of different unit load values Vertical for burner pivot angle-reheat steam temperature degree, gas baffle-reheat steam temperature degree and multiple temperature of spray desuperheating-reheat steam temperature degree Degree forecast model, may then pass through and change the weighting parameter of transmission function to determine final temperature prediction model.Assume to build Vertical have m temperature prediction model, if the forecast error of each temperature prediction model is E_m, this forecast error E_mFor temperature prediction mould Difference between output valve and the actual temperature value of type, then error weights q_iCan be expressed as:

$q_i=\frac{1/E_i}{\underset{i=1}{\overset{m}{\Σ}}(1/E_i)}---\left(3\right)$

Wherein, i is integer, and i=1 ..., m.

It is possible to further use error weights q_iCarrying out the temperature prediction model shown in correction formula (2), this correction is main It is for the transmission function in formula (2), with G₁₁As a example by function, the most revised G₁₁Can be expressed as:

$G_{11}\left(s\right)=\frac{\underset{i=1}{\overset{m}{\Σ}}{K}_i{q}_i}{\left(\underset{i=1}{\overset{m}{\Σ}}{T}_i{q}_i\right)s+1}{e}^{-\left(\underset{i=1}{\overset{m}{\Σ}}{\mathrm{\τ}}_i{q}_i\right)s}---\left(4\right)$

Other transmits function G₁₃、G₁₄G₂₂、G₂₃、G₂₄With G₁₁Similar, it is not detailed herein.Then current time is used The reheat steam temperature degree calculating subsequent time predicted by revised temperature prediction model, according to the reheating of the subsequent time of this calculating Difference between the temperature of stripping temperature and default subsequent time carries out rolling optimization to four inputs in formula (2), enters And calculate current time and should put on the controlled quentity controlled variable size of system.

Preferably, it is possible to use quadratic performance index carries out above-mentioned rolling optimization.

Optimize computing formula can be expressed as:

$\begin{array}{c}{J}_p=[y_c(k+1)-R(k+1){]}^{T}Q[y_c(k+1)-R(k+1)]\\ +\mathrm{\Δ}{U}^T\left(k\right)\mathrm{\λ\ΔU}\left(k\right)\end{array}---\left(5\right)$

This formula (5) meets constraints:

$\left\{\begin{array}{c}{y}_{\min }\≤y_c\≤y_{max}\\ {\mathrm{\Δu}}_{\min }\≤\mathrm{\Δ}U\≤{\mathrm{\Δu}}_{max}\\ u_{\min }\≤U\≤u_{max}\end{array}\right.$

Wherein, y_c(k+1) being the prediction output valve of temperature prediction model in k+1 moment, the control that R (k+1) is given is defeated Going out sequence, Q represents regulated variable error weights；Δ U represents the variable quantity of controlled quentity controlled variable；λ represents the weights of controlled quentity controlled variable variable quantity；U table Show controlled quentity controlled variable；y_minRepresent the lower limit of regulated variable；y_maxRepresent the upper limit of regulated variable；Δu_max、Δu_minFor controlled quentity controlled variable rate of change Bound；u_max、u_minBound for controlled quentity controlled variable.

Consider the state space incremental model of following linear discrete time system:

$\begin{array}{c}\mathrm{\Δx}(k+1)=\mathrm{A\Δx}\left(k\right)+B_u\mathrm{\Δu}\left(k\right)\\ y_c\left(k\right)=C_c\mathrm{\Δx}\left(k\right)+y_c(k-1)\end{array}---\left(6\right)$

Wherein, Δ x (k)=x (k)-x (k-1), Δ u (k)=u (k)-u (k-1).

In modelIt is state increment, Δ u (k) ∈ R^nuIt is the input increment of controlled quentity controlled variable:It is Controlled output；A,B_u,C_cIt it is the coefficient matrix of corresponding dimension.

Quadratic performance index function is represented by:

$\begin{array}{c}{J}_p=[y_c(k+1)-R(k+1){]}^{T}Q[y_c(k+1)-R(k+1)]\\ +\mathrm{\Δ}{U}^T\left(k\right)\mathrm{\λ\ΔU}\left(k\right)\end{array}---\left(7\right)$

Definition:

$\begin{array}{c}{E}_p(k+1|k)=R(k+1)-S_x\mathrm{\Δx}\left(k\right)-{\mathrm{Iy}}_c\left(k\right)\\ +V(y_c(k-1)-y(k-1))\end{array}---\left(8\right)$

Wherein V is feedback compensation matrix, y_cK () is the predictive value of the temperature prediction model in k moment, y_c(k-1) when being k-1 The predictive value of the temperature prediction model carved, y (k-1) is the actual value in k-1 moment.Consider constraints, then quadratic form performance refers to Scalar functions conversion becomes:

J=Δ U (k)^THΔU(k)+G(k+1|k)^TΔU(k)

$H=S_u^T{\mathrm{\Γ}}_y^T{\mathrm{\Γ}}_y{S}_u+{\mathrm{\Γ}}_u^T{\mathrm{\Γ}}_u---\left(9\right)$

$G(k+1|k)=2S_u^T{\mathrm{\Γ}}_y^T{\mathrm{\Γ}}_y{E}_p(k+1|k)$

Formula (9) meets constraints: C_uΔU≥b(k+1|k)

Wherein in formula, mathematical symbol employing is defined below:

$R(k+1)={\left[\begin{array}{c}r(k+1)\\ r(k+2)\\ .\\ .\\ .\\ r(k+p)\end{array}\right]}_{p\×1},\mathrm{\Δ}U={\left[\begin{array}{c}u\left(k\right)\\ u(k+1)\\ .\\ .\\ .\\ u(k+m-1)\end{array}\right]}_{m\×1},$

$S_u={\left[\begin{array}{ccccc}{C}_u{B}_u& 0& 0& \mathrm{...}& 0\\ \underset{i=1}{\overset{2}{\Σ}}{C}_c{A}^{i-1}{B}_u& C_u{B}_u& 0& \mathrm{...}& 0\\ .& .& .& .& .\\ .& .& .& .& .\\ .& .& .& .& .\\ \underset{i=1}{\overset{m}{\Σ}}{C}_c{A}^{i-1}{B}_u& \underset{i=1}{\overset{m}{\Σ}}{C}_c{A}^{i-1}{B}_u& \mathrm{...}& \mathrm{...}& C_u{B}_u\\ .& .& .& .& .\\ .& .& .& .& .\\ .& .& .& .& .\\ \underset{i=1}{\overset{p}{\Σ}}{C}_c{A}^{i-1}{B}_u& \underset{i=1}{\overset{p-1}{\Σ}}{C}_c{A}^{i-1}{B}_u& \mathrm{...}& \mathrm{...}& \underset{i=1}{\overset{p-m-1}{\Σ}}{C}_c{A}^{i-1}{B}_u\end{array}\right]}_{p\×m}$

$\begin{array}{cc}{S}_x={\left[\begin{array}{c}{C}_{c}A\\ C_c{A}^2+C_{c}A\\ .\\ .\\ .\\ \underset{i=1}{\overset{p}{\Σ}}{C}_c{A}^i\end{array}\right]}_{p\×1}& I={\left[\begin{array}{c}{I}_{n_c\×n_c}\\ I_{n_c\×n_c}\\ .\\ .\\ .\\ I_{n_c\×n_c}\end{array}\right]}_{p\×1}\end{array}$

$\begin{array}{cc}{Y}_{\max }(k+1)={\left[\begin{array}{c}{y}_{\max }(k+1)\\ y_{\max }(k+2)\\ .\\ .\\ .\\ y_{\max }(k+p)\end{array}\right]}_{p\×1}& Y_{\min }(k+1)={\left[\begin{array}{c}{y}_{\min }(k+1)\\ y_{\min }(k+2)\\ .\\ .\\ .\\ y_{\min }(k+p)\end{array}\right]}_{p\×1}\end{array}$

Γ_y=diag{ Γ_y,1 Γ_y,2 … Γ_y,p}_p×p

Γ_u=diag{ Γ_u,1 Γ_u,2 … Γ_u,p}_m×m

$C_u={\left[\begin{array}{cccccc}-T^T& T^T& -L^T& L^T& -S_u^T& S_u^T\end{array}\right]}_{(4m+2p)\×1}^T$

Wherein y_min(k+i)、P represents prediction step number, and m represents control step number, n_uFor control variable Number, n_bFor output variable number.Γ_y, Γ_uFor weighting matrix, r (k+p) is the control output given in (k+p) moment.Table Show n_c×n_cThe unit matrix of dimension.

Fig. 6 shows the ultimate principle figure that in another embodiment, reheat steam temperature degree controls.As shown in Figure 6, in this embodiment In, the temperature value y that current time temperature prediction model is exported_cK () compares with actual temperature value y (k), to determine model Forecast error Ve (k), then can use the temperature value of the subsequent time of this forecast error correction temperature prediction model prediction y_c(k+1), specifically, this forecast error can be added the temperature value y of the subsequent time to temperature prediction model prediction_c(k+ 1), after revising, the temperature value of subsequent time compares with preset temperature value R (k+1) in this moment in reference locus, this ginseng Examine the sequence that track refers to the temperature value in each moment set in advance, afterwards can be by representing quadratic performance index The formula (9) of function carries out rolling optimization, and then can effectively calculating current time, should to put on the controlled quentity controlled variable of system big Little, and then make in the case of the controlled quentity controlled variable of this applying, actual value and the preset value of the reheat steam temperature degree of subsequent time are close Or it is equal.

In actual control, use burner pivot angle and gas baffle that reheat steam temperature degree carries out coarse adjustment, use water spray to subtract Temperature realizes fine tuning, simultaneously need to reduce direct-contact desuperheater valve opening as far as possible, therefore, it can increasing water spray in formula (9) The constraint weight γ of attemperation control amount, then formula (9) can become:

J=Δ U (k)^THΔU(k)+G(k+1|k)^TΔU(k)+U^TγU

$H=S_u^T{\mathrm{\Γ}}_y^T{\mathrm{\Γ}}_y{S}_u+{\mathrm{\Γ}}_u^T{\mathrm{\Γ}}_u---\left(10\right)$

$G(k+1|k)=2S_u^T{\mathrm{\Γ}}_y^T{\mathrm{\Γ}}_y{E}_p(k+1|k)$

The constraints of formula (10) is: EC_uΔU≥Eb(k+1|k)

Formula (10) is carried out arrangement obtain:

J=Δ U (k)^TH′ΔU(k)+G′(k+1|k)^TΔU(k)

$H^{\′}=S_u^T{\mathrm{\Γ}}_y^T{\mathrm{\Γ}}_y{S}_u+{\mathrm{\Γ}}_u^T{\mathrm{\Γ}}_u+\mathrm{\γ}---\left(11\right)$

$G^{\′}(k+1|k)=2S_u^T{\mathrm{\Γ}}_y^T{\mathrm{\Γ}}_y{E}_p(k+1|k)+2\mathrm{\γ}U(k-1)$

The constraints of formula (11) is: EC_uΔU≥Eb(k+1|k)

Can realize spray desuperheating is controlled quantitative limitation by the constraint weight γ of regulation formula (11), and then subtract as far as possible Little direct-contact desuperheater valve opening, improves the thermal efficiency of unit.

Additionally, in the mathematical symbol of formula (9), it was predicted that the number that step number p is comprised is a lot, and this can cause rolling optimization Burden in terms of calculating, it is therefore preferred that can use block method to reduce what quadratic performance index function correspondence applied The amount of calculation of the solution procedure of controlled quentity controlled variable, i.e. only in prediction step number several selected points (general number is 8-10 point, these Point can be distributed evenly in prediction step number) on carry out rolling optimization and apply constraint weight, thus reduce amount of calculation, improve fortune Calculate speed.For specifically how using block method to belong to general knowledge known in this field, will not be described in great detail here.

Fig. 7 shows the control apparatus structure block diagram of the reheat steam temperature degree that the present invention provides.As it is shown in fig. 7, correspondingly, this Invention also provides for the control device of a kind of reheat steam temperature degree, and this device includes: receiver module 41, is used for receiving spray desuperheating to again The controlled quentity controlled variable of hot stripping temperature, gas baffle are to the controlled quentity controlled variable of reheat steam temperature degree and the burner controlled quentity controlled variable to reheat steam temperature degree； Temperature value computing module 42, for by the temperature prediction model of described reheat steam temperature degree according to described spray desuperheating to reheat steam temperature The controlled quentity controlled variable of reheat steam temperature degree is exported down by the controlled quentity controlled variable of degree, gas baffle by controlled quentity controlled variable and the burner of reheat steam temperature degree The temperature value in one moment；And controlled quentity controlled variable computing module 43, pre-according to the temperature value of described subsequent time and this subsequent time If the difference between value determines that the controlled quentity controlled variable that should apply is to control described reheat steam temperature degree.Reheat steam temperature provided by the present invention The control device of degree is similar to benefit to the operation principle of the control method of above-mentioned reheat steam temperature degree, will not be described in great detail here.

The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality Execute the detail in mode, in the technology concept of the present invention, technical scheme can be carried out multiple letter Monotropic type, these simple variant belong to protection scope of the present invention.

It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to various can The compound mode of energy illustrates the most separately.

Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this The thought of invention, it should be considered as content disclosed in this invention equally.

Claims (16)

1. a reheat steam temperature degree control method, it is characterised in that the method includes:

Receive spray desuperheating to the controlled quentity controlled variable of reheat steam temperature degree, gas baffle to the controlled quentity controlled variable of reheat steam temperature degree and burner pair The controlled quentity controlled variable of reheat steam temperature degree；

Controlled quentity controlled variable, the flue gas of reheat steam temperature degree are kept off according to described spray desuperheating by the temperature prediction model of described reheat steam temperature degree Plate exports the temperature value of subsequent time to controlled quentity controlled variable and the burner of reheat steam temperature degree to the controlled quentity controlled variable of reheat steam temperature degree；With And

The difference between temperature value and the preset value of this subsequent time according to described subsequent time determines the control that should apply Amount is to control described reheat steam temperature degree.

Method the most according to claim 1, it is characterised in that described temperature prediction model is built by following operation Vertical:

Determine about described reception spray desuperheating the controlled quentity controlled variable of reheat steam temperature degree, the gas baffle controlled quentity controlled variable to reheat steam temperature degree And burner is to each transmission function to described reheat steam temperature degree in the controlled quentity controlled variable of reheat steam temperature degree；And

Described temperature prediction model is set up according to described transferring function to.

Method the most according to claim 1, it is characterised in that described method farther includes:

The temperature value of current time according to the output of described temperature prediction model determines with the actual temperature value of this current time Error weights；

Use described error weights that described temperature prediction model is modified；And

Between temperature value and the preset value of this subsequent time of the subsequent time according to the output of revised temperature prediction model Difference determines the described controlled quentity controlled variable that should apply.

Method the most according to claim 1, it is characterised in that described method farther includes:

Difference between output valve and the actual temperature value of this current time of the current time calculating described temperature prediction model；

Use described difference that the temperature value of the subsequent time that described temperature prediction model exports is modified；And

The difference between temperature value and the preset value of this subsequent time according to revised subsequent time determines described answering The controlled quentity controlled variable applied.

5. according to the method described in claim 3 or 4, it is characterised in that use the mode of rolling optimization to calculate and described should execute The controlled quentity controlled variable added.

Method the most according to claim 5, it is characterised in that use quadratic performance index function to perform described rolling Optimize.

Method the most according to claim 6, it is characterised in that use block method to reduce described quadratic form performance and refer to The scalar functions amount of calculation to the solution procedure of the described controlled quentity controlled variable that should apply.

Method the most according to claim 6, it is characterised in that use described quadratic performance index function to perform described Rolling optimization includes:

Constraint weight is added in about the described spray desuperheating controlled quentity controlled variable to reheat steam temperature degree.

9. the control device of a reheat steam temperature degree, it is characterised in that this device includes:

Receiver module, for receiving spray desuperheating to the controlled quentity controlled variable of reheat steam temperature degree, the gas baffle control to reheat steam temperature degree Amount and the burner controlled quentity controlled variable to reheat steam temperature degree；

Temperature value computing module, for by the temperature prediction model of described reheat steam temperature degree according to described spray desuperheating to reheating vapour The controlled quentity controlled variable of reheat steam temperature degree is exported by the controlled quentity controlled variable of temperature, gas baffle by controlled quentity controlled variable and the burner of reheat steam temperature degree The temperature value of subsequent time；And

Controlled quentity controlled variable computing module, comes really according to the difference between temperature value and the preset value of this subsequent time of described subsequent time Surely the controlled quentity controlled variable that should apply is to control described reheat steam temperature degree.

Device the most according to claim 9, it is characterised in that described device also includes:

Transmission function determination module, keeps off controlled quentity controlled variable, the flue gas of reheat steam temperature degree about described reception spray desuperheating for determining Plate in the controlled quentity controlled variable of reheat steam temperature degree and the burner controlled quentity controlled variable to reheat steam temperature degree each to described reheat steam temperature degree Transmission function；And

Model building module, for transferring function to set up described temperature prediction model described in basis.

11. devices according to claim 10, it is characterised in that described device also includes:

Error weights determine module, when temperature value and this of the current time according to the output of described temperature prediction model are current The actual temperature value carved determines error weights；

Correcting module, is used for using described error weights to be modified described temperature prediction model,

The temperature value of the subsequent time that described controlled quentity controlled variable computing module exports according to revised temperature prediction model with this next Difference between the preset value in moment determines the described controlled quentity controlled variable that should apply.

12. devices according to claim 10, it is characterised in that described device also includes:

Difference calculating module, the reality of output valve with this current time for calculating the current time of described temperature prediction model Difference between temperature value；

Correcting module, for using described difference to repair the temperature value of the subsequent time that described temperature prediction model exports Just；And

Described controlled quentity controlled variable computing module is according between temperature value and the preset value of this subsequent time of revised subsequent time Difference determine the described controlled quentity controlled variable that should apply.

13. according to the device described in claim 11 or 12, it is characterised in that described controlled quentity controlled variable computing module uses rolling optimization Mode calculate the described controlled quentity controlled variable that should apply.

14. devices according to claim 13, it is characterised in that described controlled quentity controlled variable computing module uses quadratic form performance to refer to Scalar functions performs described rolling optimization.

15. devices according to claim 14, it is characterised in that described controlled quentity controlled variable computing module uses block method Reduce the described quadratic performance index function amount of calculation to the solution procedure of the described controlled quentity controlled variable that should apply.

16. devices according to claim 14, it is characterised in that described controlled quentity controlled variable computing module uses described quadratic form Energy target function performs described rolling optimization and includes:

Constraint weight is added in about the described spray desuperheating controlled quentity controlled variable to reheat steam temperature degree.