CN101504135B - Steam pressure equalization controller for boiler-turbine unit - Google Patents

Abstract

The invention discloses a steam pressure balance controller of a boiler-turbine unit, and belongs to the technical field of generating equipment control. The controller consists of a pressure difference compensator and a pressure setting point optimizer, wherein the pressure difference compensator dynamically adjusts the speed and the direction of the load command change according to the size of a stream pressure deviation signal PE and generates an actual load target value NR; and the pressure setting point optimizer dynamically adjusts a setting valve of the steam pressure under the drivingof the steam pressure deviation signal PE and generates an actual steam pressure target value P TR. Values of differencing the N R and an actual load signal N and differencing the P TR and an actual steam pressure deviation signal P TR respectively are used as input of a boiler-turbine coordinated controller to achieve the steam pressure balance control of the boiler-turbine unit. The steam pressure balance controller is arranged on the basis of the conventional boiler-turbine coordinated control so as to conveniently and effectively solve the problem that the steam pressure is frequently transfinite when the output power of a machine unit changes in a large scope, achieve the balance control of the steam pressure and improve the operation level of the machine unit.

Description

The vapour pressure balance controller of boiler-steam turbine unit

Technical field

The invention belongs to equipment control technology field, the vapour pressure balance controller of particularly a kind of boiler-steam turbine unit.Specifically be a kind of that drive, that constitute by differential pressure compensator and pressure set-point optimizer two parts by the steam pressure deviation signal, be the optimal controller of purpose to guarantee the steam pressure stable equilibrium.

Background technology

Boiler-steam turbine unit has become at present domestic the most popular and generating set form that generally adopt, its characteristic feature is: supply with a single steam turbine by a single boiler (subcritical, overcritical, recirculating fluidized bed, biomass boiler etc.) preparation steam, drive generator by steam turbine again and produce electric energy.A boiler, a steam turbine, a generator and relevant auxiliary equipment constitute unit system generating set jointly.

Verified, in the generating set of burning mineral fuel, boiler-steam turbine unit is a kind of the most efficient and economic form.However, the intrinsic contradictions that in the whole production flow process of boiler-steam turbine unit, still exist some to influence the unit operation quality, for example:

Fuel adds boiler furnace and needs the long period to the generation of high temperature and high pressure steam, and electrical network to demand n-hour of unit power output all in variation, in order to improve the speed of boiler side steam output, the aperture μ of main steam control valve _TOften be used as a kind of regulating measure, when the load command N _SpDuring increase, by increasing the aperture of main steam control valve, the accumulation of heat in the overdraw Boiler Metallic material prepare steam apace, thereby the workload demand of responsive electricity grid simultaneously, correspondingly is added to the relation between supply and demand that stove fuel quantity B comes equilibrium energy; But the variation of the aperture of main steam control valve will have influence on the steam pressure P of jet chimney outlet (before the main steam control valve) inevitably _T(being called main steam pressure), make its generation fluctuation in a big way, and main steam pressure is boiler-steam turbine unit of paramount importance procedure parameter in service, its stability will directly have influence on safety, the economical operation of unit.

In sum, the load follow speed of boiler-steam turbine unit and vapour pressure stationarity are contradictory.Existing control mode (control mode that especially connects the unit of automatic electricity generation control system AGC) is emphasized the rapidity of load responding more; and tolerance or ignore the frequent fluctuation of steam pressure to a certain extent; but under the excitation of the frequent network load demand that changes; the fluctuation of steam pressure tends to worsen sometimes, and then causes the parallel off even the shutdown of automatic system.

How when not influencing boiler-steam turbine unit load response speed, to improve the stationarity of steam pressure, realize that promptly the isostasy control under the various working is a problem demanding prompt solution.

Through retrieval, find special research at the steam pressure equalization problem to existing science and technical literature.And focus mostly in trial and emulation contrast to various advanced control algorithms for the research of boiler-steam turbine unit controls problem, as:

People such as Gao Fuyan were " energy project " (2004, the 6th phase, the 12-15 page or leaf) article of delivering on " fuzzy neural network controller is used for the research of power station master's Steam Pressure Control of Circulated " is according to the dynamic characteristic of main vapour pressure controlled device, designed a fuzzy neural network adaptive control system, this system for quoting the Fuzzy Gaussian Basis Function Neural Networks structure, and adopted based on the modified learning algorithm that becomes dimensional optimization study, emulation experiment has proved the validity of this method.But, from the engineering application point of view, there is the problem of two aspects in this research: one, regard main steam pressure as an isolated system in the literary composition and carry out Control System Design, do not take into full account the coupled relation between vapour pressure and the unit power output, only the fuel quantity that enters burner hearth by adjusting is controlled steam pressure, and the restriction to the main steam control valve aperture is not set, as network load demand generation wide variation, this method will be difficult to guarantee the stable of steam pressure; Its two, in the literary composition control system based on the neural network structure complexity, unknown parameter is many and physical significance is indeterminate, has quantity of parameters to be determined by the mode of optimizing.Therefore, this method is difficult in the industrial control system and realizes, practical value is not high.

Summary of the invention

The objective of the invention is to propose at the deficiencies in the prior art the vapour pressure balance controller of a kind of boiler-steam turbine unit, this controller architecture is simple, closing to reality ruuning situation, is easy to Project Realization.

Technical scheme of the present invention is: the vapour pressure balance controller is made of differential pressure compensator and pressure set-point optimizer two parts, both output N _RAnd P _TRRespectively with actual load signal N and actual vapour pressure signal P _TAsk of the input of difference back, can realize the balanced control of vapour pressure this boiler-steam turbine unit as the boiler-turbine coordinated controller.

N _RAnd P _TRBy vapour pressure deviation signal P _E, target load desired value N _SpWith steam pressure desired value P _Tsp, differential pressure compensator and pressure set-point optimizer the output rule determine jointly.Wherein, P _EBe conditional-variable, the foundation that relation is hinted obliquely in conversion between the driving Different Rule and I/O; N _SpAnd P _TspBe target variable, N after system's arrival stable state _RAnd P _TRFinal and N _SpAnd P _TspBe consistent; The output rule of differential pressure compensator and pressure set-point optimizer departs from the degree set of desired value according to unit operation operating mode and steam pressure.

Concrete implementation step is as follows:

1) set up the output rule of differential pressure compensator:

Depart from the degree of desired value, i.e. deviation signal P according to steam pressure _ESize, set up the output rule of differential pressure compensator according to following five kinds of situations.

1. vapour pressure deviation signal P _EIn allowed band, as | P _E|≤| 0.03P _Tsp|, and target load desired value N _SpRate of change in setting range, then adopt the output rule of discrete expression to be:

N _R(k)=N _Sp(k), as | P _E(k) |≤| 0.03P _Tsp(k) | and $F_N<\frac{N_{\mathrm{sp}}\left(k\right)-N_R(k-1)}{t\left(k\right)-t(k-1)}<R_N,$

Wherein, N _R(k) and N _R(k-1) be respectively the actual load desired value of a current sampling instant and a last sampling instant, N _Sp(k) be the target load desired value of current sampling instant, P _E(k) be the steam pressure deviation signal of current sampling instant, P _Tsp(k) be the steam pressure desired value of current sampling instant, t (k) and t (k-1) are respectively the time of a current sampling instant and a last sampling instant, F _NAnd R _NBe respectively the actual load desired value N of (can revise) given in advance _RFall off rate and climbing speed.| 0.03P _Tsp| error boundary can make amendment according to actual needs.

2. vapour pressure deviation signal P _EIn allowed band, but target load desired value N _SpClimbing speed exceeded setting speed R _N, then adopt the output rule of discrete expression to be:

N _R(k)=R _N[t (k)-t (k-1)]+N _R(k-1), as | P _E(k) |≤| 0.03P _Tsp(k) | and $\frac{N_{\mathrm{sp}}\left(k\right)-N_R(k-1)}{t\left(k\right)-t(k-1)}>R_N,$

3. vapour pressure deviation signal P _EIn allowed band, but target load desired value N _SpFall off rate exceeded setting speed F _N, then adopt the output rule of discrete expression to be:

N _R(k)=F _N[t (k)-t (k-1)]+N _R(k-1), as | P _E(k) |≤| 0.03P _Tsp(k) | and $\frac{N_{\mathrm{sp}}\left(k\right)-N_R(k-1)}{t\left(k\right)-t(k-1)}<F_N,$

4. steam pressure deviation signal P _EExceed allowed band but still be in the safe range, will temporarily stop actual load desired value N this moment _RVariation, wait for P _EGet back in the allowed band, then adopt the output rule of discrete expression to be: N _R(k)=N _R(k-1), as | 0.03P _Tsp(k) |＜| P _E(k) |≤| 0.05P _Tsp(k) |

This rule is at pressure divergence signal P _EAt [0.05P _Tsp(k) ,-0.03P _TspAnd (0.03P (k)) _Tsp(k), 0.05P _TspHave hysteresis characteristic when (k)] changing in the scope, can prevent actual load desired value N _RFrequent switching at boundary point.

5. vapour pressure deviation signal P _EExceed safe range, this moment will be with actual load desired value N _RDo oppositely to regulate, impel P _EGet back in the safe range, then adopt the output rule of discrete expression to be:

$N_R\left(k\right)=N_R(k-1)-\mathrm{\&alpha;}\frac{{\mathrm{\&tau;}}_{1}s+1}{{\mathrm{\&tau;}}_{2}s+1}{P}_E\left(k\right),$ When | P _E(k) |＞| 0.05P _Tsp(k) |

In this rule

Item is to N _RAnti-accent, influence the aperture μ of main steam control valve with this _TThereby, initiatively reduce the deviation of steam pressure.α is anti-coefficient, the generally value between 10～20 of transferring; In advance-delay component

Be in order dynamically to strengthen anti-accent intensity, to eliminate pressure divergence fast, should getting τ generally speaking ₁＞τ ₂, also desirable τ ₁=τ ₂, this moment, the anti-item of transferring just became proportional component.

In sum, the available set of equations of the output of differential pressure compensator rule is described:

2) the output rule of build-up pressure set-point optimization device

According to vapour pressure deviation signal P _ESize, according to the output rule of following six kinds of situation build-up pressure set-point optimization devices.

1. steam pressure deviation signal P _EIn allowed band, as | P _E|≤| 0.03P _Tsp|, and steam pressure desired value P _TspRate of change in setting range, then adopt the output rule of discrete expression to be:

P _TR(k)=P _Tsp(k), as | P _E(k) |≤| 0.03P _Tsp(k) | and $F_P<\frac{P_{\mathrm{Tsp}}\left(k\right)-P_{\mathrm{TR}}(k-1)}{t\left(k\right)-t(k-1)}<R_P$

Wherein, P _TR(k) and P _TR(k-1) be respectively the actual vapour pressure desired value of a current sampling instant and a last sampling instant, F _PAnd R _PBe respectively the actual vapour pressure desired value P of (can revise) given in advance _TRFall off rate and climbing speed.| 0.03P _Tsp| error boundary can make amendment according to actual needs.

2. vapour pressure deviation signal P _EIn allowed band, but steam pressure desired value P _TspClimbing speed exceeded setting speed R _P, then adopt the output rule of discrete expression to be:

P _TR(k)=R _P[t (k)-t (k-1)]+P _TR(k-1), as | P _E(k) |≤| 0.03P _Tsp(k) | and $\frac{R_{\mathrm{Tsp}}\left(k\right)-P_{\mathrm{TR}}(k-1)}{t\left(k\right)-t(k-1)}>R_P,$

3. vapour pressure deviation signal P _EIn allowed band, but steam pressure desired value P _TspFall off rate exceeded setting speed F _P, then adopt the output rule of discrete expression to be:

P _TR(k)=F _P[t (k)-t (k-1)]+P _TR(k-1), as | P _E(k) |≤| 0.03P _Tsp(k) | and $\frac{P_{\mathrm{Tsp}}\left(k\right)-P_{\mathrm{TR}}(k-1)}{t\left(k\right)-t(k-1)}<F_P,$

4. vapour pressure deviation signal P _EExceed allowed band but still be in the safe range, will temporarily stop actual vapour pressure desired value P this moment _TRVariation, wait for P _EGet back in the allowed band, then adopt the output rule of discrete expression to be:

P _TR(k)=P _TR(k-1), as | 0.03P _Tsp(k) |＜| P _E(k) |≤| 0.05P _Tsp(k) |,

This rule is at pressure divergence signal P _EAt [0.05P _Tsp(k) ,-0.03P _TspAnd (0.03P (k)) _Tsp(k), 0.05P _TspHave hysteresis characteristic when (k)] changing in the scope, can prevent actual vapour pressure desired value P _TRFrequent switching at boundary point.

5. vapour pressure deviation signal P _EGreater than the safe range upper limit+0.05P _Tsp, this moment will be with actual vapour pressure desired value P _TRDo a negative sense step, P initiatively furthers _TRWith P _TDistance, alleviate power and change and the stable contradiction of steam pressure, impel system to get back to stable state as early as possible, then adopt the output rule of discrete expression to be:

P _TR(k)=0.98P _TR(k-1), work as P _E(k)＞+0.05P _Tsp(k)

6. vapour pressure deviation signal P _ELess than safe range lower limit-0.05P _Tsp, this moment will be with actual vapour pressure desired value P _TRDo a positive step, P initiatively furthers _TRWith P _TDistance, alleviate power and change and the stable contradiction of steam pressure, impel system to get back to stable state as early as possible, then adopt the output rule of discrete expression to be:

P _TR(k)=1.02P _TR(k-1), work as P _E(k)＜-0.05P _Tsp(k)

In sum, the available set of equations of the output of pressure set-point optimizer rule is described:

3) the vapour pressure balance controller realize the balanced control of vapour pressure mode

With the mode of above-mentioned rule (1) and (2) application software configuration in scattered control system DCS, or the mode that the application hardware circuit combines with software programming is realized.

Realize that in DCS the vapour pressure balance controller is the most convenient, a mode that only needs to use configuration is regular according to (1) and (2) establishment, then with the output N of differential pressure compensator _ROutput P with the pressure set-point optimizer _TRGiven input as the boiler-turbine coordinated controller gets final product.

If the memory capacity exclusive disjunction of DCS load is limited, the mode that just needs to adopt hardware circuit to combine with software programming realizes the balanced control of vapour pressure.This hardware circuit also comprises I/O interface, communication interface, synchronous circuit, real-time clock, EPROM, RAM, failure detector circuit, power-fail detection circuit etc. except that comprising central processing unit.Wherein the I/O interface is used to connect keyboard and display; Communication interface is used for carrying out data communication with DCS; Synchronous circuit and real-time clock are used for data acquisition and the time synchronized of transmitting; EPROM is used to store the output rule by the differential pressure compensator and the pressure set-point optimizer of software programming; RAM is used to store the real time data from DCS; Failure detector circuit is used for the program that automatically resets when computing is failed; Power-fail detection circuit is used for the status information of protection central processing unit when voltage die or instant cut-off.This circuit obtains steam pressure deviation signal P by communication interface from DCS _E, target load desired value N _SpWith steam pressure desired value P _TspAgain with the output N of the differential pressure compensator that produces after the computing _ROutput P with the pressure set-point optimizer _TRSend back among the DCS,, can realize the equilibrium control of steam pressure as the realistic objective value of boiler-turbine coordinated controller.

Consider the complexity of real system, in engineering is used, also need in conjunction with field trial to the pressure control boundary point selected in the above-mentioned rule (| 0.03P _Tsp| and | 0.05P _Tsp|) suitably adjust and reset.

The invention has the beneficial effects as follows the method that the present invention proposes of using, engineers and technicians can be at various types of boilers-steam turbine unit, newly-increased vapour pressure balance controller on the basis of conventional boiler-turbine coordinated control, the problem that steam pressure frequently transfinites when solving unit power output wide variation easily and effectively, realize the equilibrium control of steam pressure, improve the unit operation level.

Description of drawings

Fig. 1 is the composition structure of boiler-steam turbine unit vapour pressure balance controller and the raw material schematic diagram that turbine-boiler coordinated control system connects thereof.

The hardware circuit figure of Fig. 2 boiler-steam turbine unit vapour pressure balance controller.

Shown in Figure 3 is the nonlinear model figure of certain 500MW of power plant boiler-steam turbine unit.

Fig. 4 is the response curve of vapour pressure balance controller performance test under the fixed pressure operation mode among the embodiment.

Fig. 5 is the sliding pressure operation curve map of certain 500MW of power plant boiler-steam turbine unit.

Fig. 6 is the response curve that the balanced control performance of vapour pressure is tested under the sliding pressure operation mode among the embodiment.

The specific embodiment

The present invention proposes the vapour pressure balance controller of a kind of boiler-steam turbine unit, below in conjunction with drawings and Examples technical scheme of the present invention is further described.

Shown in Figure 1, vapour pressure balance controller 1 is made of differential pressure compensator 2 and pressure set-point optimizer 3 two parts.Output N with differential pressure compensator 2 _ROutput P with set-point optimization device 3 _TRRespectively with actual load signal N and actual vapour pressure signal P _TAsk of the input of difference back, can realize the balanced control of vapour pressure boiler-steam turbine unit 5 as boiler-turbine coordinated controller 4.

Figure 2 shows that the implementation that vapour pressure balance controller 1 adopts hardware circuit to combine with software programming.This hardware circuit also comprises I/O interface, communication interface, synchronous circuit, real-time clock, EPROM, RAM, failure detector circuit, power-fail detection circuit etc. except that comprising central processing unit.Wherein the I/O interface is used to connect keyboard and display; Communication interface is used for carrying out data communication with DCS; Synchronous circuit and real-time clock are used for data acquisition and the time synchronized of transmitting; EPROM is used to store the output rule by the differential pressure compensator and the pressure set-point optimizer of software programming; RAM is used to store the real time data from DCS; Failure detector circuit is used for the program that automatically resets when computing is failed; Power-fail detection circuit is used for the status information of protection central processing unit when voltage die or instant cut-off.This circuit obtains steam pressure deviation signal P by communication interface from DCS _E, target load desired value N _SpWith steam pressure desired value P _TspAgain with the output N of the differential pressure compensator that produces after the computing _ROutput P with the pressure set-point optimizer _TRSend back among the DCS,, can realize equilibrium control steam pressure as the realistic objective value of boiler-turbine coordinated controller.

Embodiment: shown in Figure 3 is the nonlinear model of certain 500MW of power plant boiler-steam turbine unit, and the nominal parameter of unit is respectively: main steam pressure 16.18Mpa, drum pressure 18.97Mpa, main steam flow 1650t/h, power output 500MW.Fuel quantity B% and main steam control valve aperture μ % satisfy speed and amplitude limitation respectively: | dB/dt|≤1.0/s, 0.0≤B≤100.0 and 0.0≤μ≤100.0.Based on above-mentioned model, the method that application the present invention provides realizes the balanced control of the vapour pressure of boiler-steam turbine unit, and concrete implementation step is as follows:

1) at first, design the boiler-turbine coordinated controller of this model according to linear decoupling zero control theory:

$\left[\begin{array}{c}B\\ {\mathrm{\&mu;}}_T\end{array}\right]=\left[\begin{array}{cc}6.91+760s& 0.1298+0.001/s\\ -0.0625/s& 0.001/s\end{array}\right]\left[\begin{array}{cc}0.01& 0\\ 0& 0.018+0.4s\end{array}\right]\left[\begin{array}{c}{P}_E\\ N_E\end{array}\right]$

2) then, realize differential pressure compensator and pressure set-point optimizer according to the form of formula (1) and formula (2) in the mode of software programming, the two forms vapour pressure balance controller.Wherein, pressure control boundary point elect as (| 0.03P _Tsp| and | 0.05P _Tsp|), anti-factor alpha=18, the timeconstant transferred ₁=τ ₂

3) then, the form of pressing Fig. 1 connects vapour pressure balance controller and boiler-turbine coordinated controller, can realize the isostasy control to this boiler-steam turbine model of element.

In order to check the performance of the vapour pressure balance controller that the present invention proposes, carry out two groups of l-G simulation tests respectively:

1. vapour pressure balance controller performance test under the fixed pressure operation mode

Set unit and be operated in fixed pressure operation mode (setting value of main steam pressure not random groups power output and change), lifting load speed is unrestricted (to be F _N=-∞, R _N=+∞) tested from t=50s target load desired value N _SpDrop to 400MW from the 500MW step, the power output response curve is shown in Fig. 4 upper curve.Chain-dotted line among the figure

Be actual load desired value N _RWith actual vapour pressure desired value P _TRDotted line

Be target load desired value N _SpWith steam pressure desired value P _TspDotted line-----be the power output of unit when not adding the vapour pressure balance controller; Vapor curve is shown in Fig. 4 lower curve; Solid line---be the power output and the vapor curve of unit behind the adding vapour pressure balance controller.From trial curve as can be seen, since the adding of vapour pressure balance controller, actual load desired value N _RWith actual vapour pressure desired value P _TRThan being target load desired value N _SpWith steam pressure desired value P _TspObvious change is arranged, and under this effect, the pressure stationarity of unit obviously improves, and has kept the original follow-up capability to the network load demand of unit simultaneously.

2. vapour pressure balance controller performance test under the sliding pressure operation mode

Set unit and be operated in sliding pressure operation mode (variation of the definite value random groups power output definite value of main steam pressure and change, the corresponding relation curve as shown in Figure 5).Lifting load speed and vapour pressure rate of change are set at F _N=-15MW/min, R _N=+15MW/min, F _P=-0.3MPa/min, R _P=+0.3MPa/min.Test is from t=50s, target load desired value N _SpRise to 400MW, steam pressure desired value P from 300MW with the speed of 12MW/min _TspBy sliding pressure curvilinear motion response curve as shown in Figure 6.From trial curve as can be seen, even under the sliding pressure operation mode, the adding of vapour pressure balance controller also can obviously improve the pressure stationarity of unit, keeps the good load follow-up capability simultaneously.What more than set forth is the good control effect that a embodiment that the present invention provides shows.It is pointed out that the present invention is not only limited to the foregoing description, do not departing from essence spirit of the present invention and do not exceeding under the prerequisite of the related scope of flesh and blood of the present invention and can adapt to polytype boiler-steam turbine unit by it being carried out suitable distortion.

Claims (2)

1. the vapour pressure balance controller of boiler-steam turbine unit is characterized in that:

The vapour pressure balance controller of boiler-steam turbine unit is made up of differential pressure compensator and pressure set-point optimizer two parts; Described differential pressure compensator is according to vapour pressure deviation signal P _ESize produce actual load desired value N _R, the rule that foundation is following:

In the formula, N _R(k) and N _R(k-1) be respectively the actual load desired value of a current sampling instant and a last sampling instant, N _Sp(k) be the target load desired value of current sampling instant, P _E(k) be the vapour pressure deviation signal of current sampling instant, P _Tsp(k) be the steam pressure desired value of current sampling instant, t (k) and t (k-1) are respectively the time of a current sampling instant and a last sampling instant, F _NAnd R _NBe respectively actual load desired value N given in advance _RFall off rate and climbing speed,

Item is to N _RAnti-accent, influence the aperture μ of main steam control valve with this _TThereby, initiatively reducing the deviation of steam pressure, α is the anti-coefficient of transferring, span is between 10～20, and is leading-delay component

Be in order dynamically to strengthen anti-accent intensity, to eliminate pressure divergence fast, getting τ ₁〉=τ ₂

Described pressure set-point optimizer is according to vapour pressure deviation signal P _ESize produce actual vapour pressure desired value P _TR, the rule that foundation is following:

In the formula, P _TR(k) and P _TR(k-1) be respectively the actual vapour pressure desired value of a current sampling instant and a last sampling instant, F _PAnd R _PBe respectively actual vapour pressure desired value P given in advance _TRDecline and climbing speed;

Above-mentioned vapour pressure deviation signal P _EGreater than the safe range upper limit+0.05P _TspThe time will be with actual vapour pressure desired value P _TRDoing an amplitude is 0.02P _TR(k-1) negative sense step, P initiatively furthers _TRWith P _TDistance, alleviate power and change and the stable contradiction of steam pressure, impel system to get back to stable state as early as possible; In like manner, vapour pressure deviation signal P _ELess than safe range lower limit-0.05P _TspThe time will be with actual vapour pressure desired value P _TRDoing an amplitude is 0.02P _TR(k-1) positive step is alleviated power and is changed and the stable contradiction of steam pressure;

Above-mentioned vapour pressure deviation signal P _EAt [0.05P _Tsp(k) ,-0.03P _TspAnd (0.03P (k)) _Tsp(k), 0.05P _TspHave hysteresis characteristic when (k)] changing in the scope, can prevent actual load desired value N _RFrequent switching at boundary point; | 0.03P _Tsp| and | 0.05P _Tsp| error boundary can make amendment;

Described pressure compensator is according to rule, according to vapour pressure deviation signal P _ESize dynamically adjust speed and the direction that the load instruction changes, produce actual load desired value N _RThe pressure set-point optimizer is according to operating condition, at vapour pressure deviation signal P _EDriving under, dynamically adjust the setting value of steam pressure according to rule, produce actual vapour pressure desired value P _TRWith N _RAnd P _TRRespectively with actual load signal N and actual vapour pressure deviation signal P _TAsk of the input of difference back, thereby realize the balanced control of vapour pressure boiler-steam turbine unit as the boiler-turbine coordinated controller.

2. the vapour pressure balance controller of a kind of boiler according to claim 1-steam turbine unit, it is characterized in that, described vapour pressure balance controller adopts the mode of application software configuration in scattered control system DCS, or the mode that the application hardware circuit combines with software programming is realized; Except that comprising central processing unit, also comprise I/O interface, communication interface, synchronous circuit, real-time clock, EPROM, RAM, failure detector circuit and power-fail detection circuit in the hardware circuit; Wherein the I/O interface is used to connect keyboard and display; Communication interface is used for carrying out data communication with DCS; Synchronous circuit and real-time clock are used for data acquisition and the time synchronized of transmitting; EPROM is used to store the output rule by the differential pressure compensator and the pressure set-point optimizer of software programming; RAM is used to store the real time data from DCS; Failure detector circuit is used for the program that automatically resets when computing is failed; Power-fail detection circuit is used for the status information of protection central processing unit when voltage die or instant cut-off; Communication interface obtains vapour pressure deviation signal P from DCS _E, target load desired value N _SpWith steam pressure desired value P _TspAgain with the output N of the differential pressure compensator that produces after the computing _ROutput P with the pressure set-point optimizer _TRSend back among the DCS realistic objective value as the boiler-turbine coordinated controller.

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