CN105183023A - Main steam pressure feedforward control method and apparatus of unit set - Google Patents
Main steam pressure feedforward control method and apparatus of unit set Download PDFInfo
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Abstract
The invention provides a main steam pressure feedforward control method and apparatus of a unit set. The method comprises: an initial pressure target value is received and thus after the initial pressure target value is processed by measuring range restriction, first rate restriction, and a third-order inertia link, a pressure set value simulating an actual pressure is generated; a pressure target value is received and a new pressure set value simulating an actual pressure is generated, and a current actual pressure is locked as a pressure changing initial value; an energy requiring quantity is generated based on the pressure target value and the pressure changing initial value; a boiler entrance energy value is obtained and whether a supply and demand relation is in balance mode is determined based on the energy requiring quantity and the boiler entrance energy value; second rate restriction is carried out on a preset coal feeding rate number, and if the current supply and demand relation is in an unbalance mode, the coal feeding rate number after the second rate restriction is used as a feedforward signal; and a current actual pressure value is obtained and the actual pressure value and a new pressure set value are sent into a PID controller, and a coal quantity instruction is generated according to the output value of the feedforward signal of the PID controller.
Description
Technical field
The invention relates to thermal power plant's monoblock Pressure Control Technology, particularly, is about a kind of monoblock main vapour pressure feed forward control method and device.
Background technology
Modern Power Plant monoblock is usually using the mark of main steam pressure as measurement boiler, steam turbine homenergic balance between supply and demand and unit safety operation, if main steam pressure is constant, then show that the main steam flow (main steam heat energy) that boiler supplies is equal with the main steam flow (main steam heat energy) needed for steam turbine, if main steam pressure is higher or on the low side, supply exceed demand or demand exceeds supply then to show energy, certainly will affect security and the economy of boiler and unit.So the main production task of boiler is the demand adapting to load under the prerequisite that main steam pressure fluctuation is as far as possible little as quickly as possible.In the middle of practical application, this task has been come by unit coordinatedcontrol system (CCS) usually, and in CCS system, main steam pressure is as main regulated variable.
In Modern Power Plant, boiler capacity is large, thermal inertia is large, the coal of burning is changeable, and network load demand shift is also large, this adds increased the difficulty of Boiler Combustion Regulating System, causes main steam pressure frequent fluctuation, must seek good regulation strategy.
In existing CCS, main vapour pressure control system mainly adopts feedforward-feedback complex control system.FEEDBACK CONTROL mainly refers to the single loop regulation strategy based on main steam pressure and deviation from the index value, namely only carrys out adjust fuel amount (coal amount) using deviation as control signal.Feedback control system has that framework is simple, parameter is few and advantage easily of adjusting, but exists and control the slower shortcoming of response speed.Feedforward control is used for compensating delaying and inertia of boiler dynamic response, accelerates pressure-responsive speed.In prior art, feed-forward signal is mainly differentiated to the setting value that pressure target value is formed after speed limit, is then multiplied by coefficient, when pressure set points changes, adds certain coal amount immediately, as shown in Figure 1.
In above-mentioned control procedure, as long as pressure set points is in change, feedforward will in the certain coal amount of controller outlet superposition, energy is provided for improving boiler heat storage, superposition coal amount is omnidistance in change procedure to be existed, and in the overall process of pressure set points change, it is uniform distribution that institute's coal amount changes in time, can not flexible configuration, such as can suitably add coal amount in early stage and improve the speed of response.Because boiler exists very large inertia and delays, actual pressure value must have compared with pressure set points necessarily delays, and now pressure set points and actual pressure value can produce deviation, and respond slower, this deviation is larger, and FEEDBACK CONTROL will work.If pressure target value changes greatly, pressure set points transformation period is then corresponding longer, and in dynamic process, PID exports will play retroaction to Stress control result.
Summary of the invention
The fundamental purpose of the embodiment of the present invention is to provide a kind of monoblock main vapour pressure feed forward control method and device, to be optimized configuration to the coal amount of coal amount in whole pressure setting change procedure, increase the effect of feedforward and reduce the corrective action of PID, thus improve the unit speed of response, reduce the time delay of unit pressure change.
To achieve these goals, the embodiment of the present invention provides a kind of monoblock main vapour pressure feed forward control method, described method comprises: receive an original pressure desired value, make described original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generate the pressure set points of simulation actual pressure; Receive a pressure target value, make described pressure target value after overrange restriction, first rate restriction and three rank inertial elements, generate the new pressure set points of simulation actual pressure; Control actual pressure value from described pressure set points to described new pressure set points change, and current actual pressure value is locked as pressure change initial value; According to described pressure target value and pressure change forming initial fields energy requirement amount; Obtain and one enter boiler energy, and according to described energy requirement amount and enter boiler energy and judge whether current supply and demand balances; Second rate limit is carried out, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal to a coal supply rate score preset; Obtain current actual pressure value, described actual pressure value and new pressure set points are sent into PID controller, and generate the instruction of coal amount according to the output quantity of PID controller and described feed-forward signal.
In one embodiment, above-mentioned method also comprises: carry out integral and calculating to the coal supply rate score through the second rate limit, generate an integral result; Described integral result is multiplied by a unit of coal energy parameter, described in generation, enters boiler energy.
In one embodiment, above-mentioned according to described energy requirement amount and enter boiler energy and judge whether current supply and demand balances, and comprising: judge described energy requirement amount deduct described in enter boiler energy difference whether be less than or equal to 0; If so, then the current equilibrium of supply and demand is judged; Otherwise judge current unbalanced supply-demand.
In one embodiment, when judging the present energy equilibrium of supply and demand, the described boiler energy that enters is carried out clearing reset.
In one embodiment, according to described pressure target value and pressure change forming initial fields energy requirement amount, comprising: the difference described pressure target value being deducted described pressure change initial value gained, be multiplied by a heat storage coefficient, the energy requirement amount described in generation.
In one embodiment, generate the instruction of coal amount according to the output quantity of PID controller and described feed-forward signal, comprising: after described output quantity is superposed with described feed-forward signal, the coal amount instruction described in being generated by station of automatically switching on the other hand.
The embodiment of the present invention also provides a kind of monoblock main vapour pressure feedforward control device, described device comprises: pressure set points generation unit, for receiving an original pressure desired value, make described original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generate the pressure set points of simulation actual pressure; New pressure set points generation unit, for receiving a pressure target value, making described pressure target value after overrange restriction, first rate restriction and three rank inertial elements, generating the new pressure set points of simulation actual pressure; The locking of pressure change initial value, for controlling actual pressure value from described pressure set points to described new pressure set points change, and is locked as pressure change initial value by current actual pressure value; Energy requirement amount generation unit, for changing forming initial fields energy requirement amount according to described pressure target value and pressure; Equilibrium of supply and demand judging unit, enters boiler energy for obtaining one, and according to described energy requirement amount and enter boiler energy and judge whether current supply and demand balances; Feed-forward signal generation unit, carries out the second rate limit, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal for the coal supply rate score preset; Coal amount instruction generation unit, for obtaining current actual pressure value, sends described actual pressure value and new pressure set points into PID controller, and generates the instruction of coal amount according to the output quantity of PID controller and described feed-forward signal.
In one embodiment, above-mentioned device also comprises: integral result generation unit, for carrying out integral and calculating to the coal supply rate score through the second rate limit, generates an integral result; Enter boiler energy generation unit, for described integral result is multiplied by a unit of coal energy parameter, described in generation, enter boiler energy.
In one embodiment, above-mentioned equilibrium of supply and demand judging unit specifically for: judge described energy requirement amount deduct described in enter boiler energy difference whether be less than or equal to 0; If so, then the current equilibrium of supply and demand is judged; Otherwise judge current unbalanced supply-demand.
In one embodiment, above-mentioned device also comprises: enter boiler energy reset reset unit, when judge the present energy equilibrium of supply and demand time, described in enter boiler energy reset reset unit by described enter boiler energy carry out clearings reset.
In one embodiment, above-mentioned energy requirement amount generation unit, specifically for the difference that described pressure target value deducted described pressure change initial value gained, is multiplied by a heat storage coefficient, the energy requirement amount described in generation.
In one embodiment, above-mentioned coal amount instruction generation unit specifically for: after described output quantity being superposed with described feed-forward signal, generate the instruction of described coal amount by station of automatically switching on the other hand.
The beneficial effect of the embodiment of the present invention is, calculates and enters boiler energy, feedforward control combined with traditional PI D closed-loop control, can reach Stress control effect fast and accurately, thus improves pressure respective rate, minimizing boiler time delay.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the control flow chart of feedforward-feedback complex control system in prior art;
Fig. 2 is the process flow diagram of the monoblock main vapour pressure feed forward control method according to the embodiment of the present invention;
Fig. 3 calculates circuit diagram according to the energy requirement gauge of the embodiment of the present invention;
Fig. 4 changes and pressure variation relation schematic diagram according to the coal amount of the embodiment of the present invention;
Fig. 5 judges circuit diagram according to the energy equilibrium of supply and demand of the embodiment of the present invention;
Fig. 6 generates circuit diagram according to the feed-forward signal of the embodiment of the present invention;
Fig. 7 is the structural representation of the monoblock main vapour pressure feedforward control device according to the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of monoblock main vapour pressure feed forward control method and device.Below in conjunction with accompanying drawing, the present invention is described in detail.
The embodiment of the present invention provides a kind of monoblock main vapour pressure feed forward control method, and as shown in Figure 2, the method mainly comprises following steps:
Step S101: receive an original pressure desired value, makes original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generates the pressure set points of simulation actual pressure;
Step S102: receive a pressure target value, makes pressure target value after overrange restriction, first rate restriction and three rank inertial elements, generates the new pressure set points of simulation actual pressure;
Step S103: control actual pressure value and change to new pressure set points from pressure set points, and current actual pressure value is locked as pressure change initial value;
Step S104: according to pressure target value and pressure change forming initial fields energy requirement amount;
Step S105: obtain and one enter boiler energy, and according to energy requirement amount and enter boiler energy and judge whether current supply and demand balances;
Step S106: the second rate limit is carried out, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal to a coal supply rate score preset;
Step S107: obtain current actual pressure value, sends actual pressure value and new pressure set points into PID controller, and generates the instruction of coal amount according to the output quantity of PID controller and feed-forward signal.
By above-mentioned step S101 ~ step S107, whether the energy requirement amount calculated when utilizing original pressure desired value to change is carried out the current supply and demand of judging unit unit and is balanced, when unbalanced supply-demand, corresponding feed-forward signal is generated according to the change of original pressure desired value, and combine with PID controller according to this feed-forward signal, the coal amount of monoblock is controlled, generates the instruction of corresponding coal amount.
Based on above-mentioned overall plan, the monoblock main vapour pressure feed forward control method of the embodiment of the present invention controls stove coal amount by calculating boiler energy demand and the actual the supply and demand equilibrium entering energy, optimizes the way of output of coal amount, improves pressure-responsive speed.
Below each step of the monoblock main vapour pressure feed forward control method of the embodiment of the present invention is described in detail.
Above-mentioned step S101, receives an original pressure desired value, makes original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generates the pressure set points of simulation actual pressure.
As shown in Figure 3, under Thermal generation unit unit coordinatedcontrol system (CCS) control is dropped into monoblock, an original pressure desired value is set by this control system, as current pressure target parameter, range restriction, rate limit are carried out to this original pressure desired value, to limit a variation range and the amplitude of variation of this original pressure desired value, and make it through three rank inertial element processes, three rank inertial elements are made up of three first order inertial loops.One order inertia transport function is 1/ (TS+1), and original pressure desired value, after this three rank inertial element process, has certain delay, thus can pressure actual change situation before analog machine, reduces PID controller initial stage control action.
In practical application, above-mentioned Thermal generation unit unit coordinatedcontrol system (CCS), substantially stove is all adopted to be primal coordination control mode with machine, namely by pressure before boiler implosion machine, and by steam turbine control generated output, adopt this kind of mode can the workload demand of responsive electricity grid end fast.After unit coordinatedcontrol system drops into, main loads instruction keeps constant, and due to the rapidity of steam turbine pitch regulating power regulated variable, no matter the change of coal amount causes pressure how to change, and all can think that power is constant.For pressure before regulated variable machine, although it is by coal amount and steam turbine pitch co-controlling, pitch action can't produce power, pitch can be thought intermediate link, and not spend too much consideration.Now, when power remains unchanged, can think that coal amount and pressure are that a single-input single-output is without self-balancing ability link.As shown in Figure 4, as coal amount changes delta B, after continuing the Δ t time, change value of pressure is Δ P
t, visible, change value of pressure and the coal supply rate and the time that enter burner hearth, relevant with coal supply total amount in other words.It can thus be appreciated that, control total coal amount, can gross energy be controlled.Boiler pressure represent boiler accumulation of energy number, enter boiler energy so change, i.e. for a change main vapour pressure.Detailed process can represent with following formula:
k∫ΔB·Δt＝ΔP
T·C
b，
Wherein, k is the thermal value of unit coal amount, C
bfor the heat storage coefficient of boiler.
Above-mentioned steps S102, when control system receives a pressure target value, carries out range restriction, rate limit to this pressure target value, and after three rank inertial element processes, generates the new pressure set points of simulation actual pressure.
After generating this new pressure set points, control above-mentioned pressure target parameter and change by original pressure set points to this new pressure set points, at the end of pressure target Parameters variation, the value of this pressure target parameter is above-mentioned new pressure set points.At the pressure target Parameters variation initial stage, pressure set points, owing to there being speed limit effect, can not change immediately, and now this pressure set points is locked as pressure change initial value, this process is above-mentioned step S103.
After obtaining pressure change initial value by above-mentioned steps S103, above-mentioned step S104 can be performed, calculate according to above-mentioned pressure target value and pressure change initial value and obtain energy requirement amount.Particularly, be pressure target value is deducted pressure change initial value, the difference of gained is multiplied by a heat storage coefficient (K1) again, and the result of gained is this energy requirement amount.
Wherein, the deterministic process of above-mentioned heat storage coefficient K1 is: monoblock be in hot after, drop into DEH loop of power circuit control mode, keep the power of the assembling unit, pressure, the major parameters such as Stream temperature degree are stablized.Obtain current boiler pressure P1, steam coal amount step is increased input x, and final pressure is stabilized in P2.Now, then the value of this heat storage coefficient K1 can be asked to be | x/ (P2-P1) |.
Above-mentioned step S105, obtains and one enters boiler energy, and according to energy requirement amount and enter boiler energy and judge whether current supply and demand balances.After obtaining above-mentioned energy requirement amount, this energy requirement amount and one is entered boiler energy and compares, thus can judge whether current system is in equilibrium of supply and demand state.As shown in Figure 5, particularly, be deduct this by this energy requirement amount to enter boiler energy, judge the magnitude relationship of gained difference and 0.When this difference is less than or equal to 0, then can the current state being in the equilibrium of supply and demand of identifying unit unit, then do not need to add coal amount again, make monoblock keep current state; If this difference is greater than 0, then illustrates that monoblock is current and be not in the equilibrium of supply and demand, also needing to regulate by adding coal amount.
Above-mentioned step S106, carries out the second rate limit, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal to a coal supply rate score preset.Particularly, this coal supply rate score can set according to the needs of system cloud gray model, and, as shown in Figure 6, when above-mentioned pressure set points relative to original pressure desired value for rising or declining time, respectively corresponding different coal supply rate score: setting feedforward institute produces coal supply rate score, and to export rear be a.When pressure set points is decline relative to original pressure desired value, this coal supply rate score is K2; When pressure set points relative to original pressure desired value for rise time, this coal supply rate score is K3, wherein, K3 be on the occasion of, K2 is negative value.According to the situation of pressure set points, the coal supply rate score a of output can get K2 or K3 accordingly.
Further, based on the decision process of above-mentioned steps S105, limit the output valve of this coal supply rate score: when the current equilibrium of supply and demand of monoblock, then the final coal supply rate score a exported gets 0, namely the active cell unit equilibrium of supply and demand is represented, without the need to adding more coal amount again; And when the current unbalanced supply-demand of monoblock, then need to carry out rate limit to coal supply rate score a, limit the speed increasing or reduce coal amount, and a feed-forward signal can be generated according to the coal supply rate score after rate limit, as the basis of feedforward control.
Above-mentioned step S107: obtain current actual pressure value, sends actual pressure value and new pressure set points into PID controller, and generates the instruction of coal amount according to the output quantity of PID controller and feed-forward signal.
Obtain the current actual pressure value being in the monoblock of running status, and this actual pressure value is together transferred to PID controller with the new pressure set points generated according to pressure target value carry out pressure adjustment, PID controller exports the Output pressure amount through overregulating, by superimposed for the feed-forward signal generated in this Output pressure amount and step S106, again through receiving and distributing the station MA that automatically switches, the instruction of final generation coal amount, with the coal amount in control module unit.
It should be noted that, when in step S105, identifying unit unit is current be in the equilibrium of supply and demand state time, then the coal supply rate score in feed-forward signal is 0, shows without the need to adding more coal amount.And when judge current supply and demand in step S105 and uneven time, integral and calculating can be carried out according to the coal supply rate score through rate limit generated in step S106, the overall coal amount that need add is obtained according to this coal supply rate score, and this overall coal amount is multiplied by a unit of coal energy parameter K4, generate and above-mentioned enter boiler energy.Thus, this can be entered boiler energy and be applied in above-mentioned step S105 further, again judge whether the monoblock added after corresponding coal amount is in the state of the equilibrium of supply and demand.
The monoblock main vapour pressure feed forward control method of the embodiment of the present invention mainly has the following advantages:
(1) energy entering burner hearth by quantitatively calculating boiler controls coal amount, makes control effects more accurate.
(2) pressure set points to carry out coal amount early stage fast super add/surpass subtract, improve pressure-responsive speed, minimizing boiler time delay.
The embodiment of the present invention provides a kind of monoblock main vapour pressure feedforward control device, as shown in Figure 7, this device mainly comprises following part: pressure set points generation unit 1, new pressure set points generation unit 2, pressure change initial value lock cell 3, energy requirement amount generation unit 4, equilibrium of supply and demand judging unit 5, feed-forward signal generation unit 6 and coal amount instruction generation unit 7 etc.
Above-mentioned pressure set points generation unit 1, for receiving an original pressure desired value, makes original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generates the pressure set points of simulation actual pressure;
New pressure set points generation unit 2, for receiving a pressure target value, makes pressure target value after overrange restriction, first rate restriction and three rank inertial elements, generates the new pressure set points of simulation actual pressure;
Pressure change initial value lock cell 3 changes to new pressure set points from pressure set points for controlling actual pressure value, and current actual pressure value is locked as pressure change initial value;
Energy requirement amount generation unit 4 is for changing forming initial fields energy requirement amount according to pressure target value and pressure;
Equilibrium of supply and demand judging unit 5 enters boiler energy for obtaining one, and according to energy requirement amount and enter boiler energy and judge whether current supply and demand balances;
Feed-forward signal generation unit 6 carries out the second rate limit, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal for the coal supply rate score preset;
Actual pressure value and new pressure set points, for obtaining current actual pressure value, are sent into PID controller by coal amount instruction generation unit 7, and generate the instruction of coal amount according to the output quantity of PID controller and feed-forward signal.
By the Collaboration of above-mentioned various piece, whether the energy requirement amount calculated when utilizing original pressure desired value to change is carried out the current supply and demand of judging unit unit and is balanced, when unbalanced supply-demand, corresponding feed-forward signal is generated according to the change of original pressure desired value, and combine with PID controller according to this feed-forward signal, the coal amount of monoblock is controlled, generates the instruction of corresponding coal amount.
Based on above-mentioned overall plan, the monoblock main vapour pressure feedforward control device of the embodiment of the present invention controls stove coal amount by calculating boiler energy demand and the actual the supply and demand equilibrium entering energy, optimizes the way of output of coal amount, improves pressure-responsive speed.
Below the various piece of the monoblock main vapour pressure feedforward control device of the embodiment of the present invention is described in detail.
Above-mentioned pressure set points generation unit 1, for receiving an original pressure desired value, making original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generating the pressure set points of simulation actual pressure.
As shown in Figure 3, under Thermal generation unit unit coordinatedcontrol system (CCS) control is dropped into monoblock, an original pressure desired value is set by this control system, as current pressure target parameter, range restriction, rate limit are carried out to this original pressure desired value, to limit a variation range and the amplitude of variation of this original pressure desired value, and make it through three rank inertial element processes, three rank inertial elements are made up of three first order inertial loops.One order inertia transport function is 1/ (TS+1), and original pressure desired value, after this three rank inertial element process, has certain delay, thus can pressure actual change situation before analog machine, reduces PID controller initial stage control action.
In practical application, above-mentioned Thermal generation unit unit coordinatedcontrol system (CCS), substantially stove is all adopted to be primal coordination control mode with machine, namely by pressure before boiler implosion machine, and by steam turbine control generated output, adopt this kind of mode can the workload demand of responsive electricity grid end fast.After unit coordinatedcontrol system drops into, main loads instruction keeps constant, and due to the rapidity of steam turbine pitch regulating power regulated variable, no matter the change of coal amount causes pressure how to change, and all can think that power is constant.For pressure before regulated variable machine, although it is by coal amount and steam turbine pitch co-controlling, pitch action can't produce power, pitch can be thought intermediate link, and not spend too much consideration.Now, when power remains unchanged, can think that coal amount and pressure are that a single-input single-output is without self-balancing ability link.As shown in Figure 4, as coal amount changes delta B, after continuing the Δ t time, change value of pressure is Δ P
t, visible, change value of pressure and the coal supply rate and the time that enter burner hearth, relevant with coal supply total amount in other words.It can thus be appreciated that, control total coal amount, can gross energy be controlled.Boiler pressure represent boiler accumulation of energy number, enter boiler energy so change, i.e. for a change main vapour pressure.Detailed process can represent with following formula:
k∫ΔB·Δt＝ΔP
T·C
b，
Wherein, k is the thermal value of unit coal amount, C
bfor the heat storage coefficient of boiler.
When above-mentioned new pressure set points generation unit 2 receives a pressure target value, range restriction, rate limit are carried out to this pressure target value, and after three rank inertial element processes, generate the new pressure set points of simulation actual pressure.
After new pressure set points generation unit 2 generates this new pressure set points, pressure change initial value lock cell 3 controls above-mentioned pressure target parameter to be changed by original pressure set points to this new pressure set points, at the end of pressure target Parameters variation, the value of this pressure target parameter is above-mentioned new pressure set points.At the pressure target Parameters variation initial stage, pressure set points, owing to there being speed limit effect, can not change immediately, and now, this pressure set points is locked as pressure change initial value by pressure change initial value lock cell 3.
After obtaining pressure change initial value by above-mentioned pressure change initial value lock cell 3, namely by above-mentioned energy requirement amount generation unit 4, calculate according to above-mentioned pressure target value and pressure change initial value and obtain energy requirement amount.Particularly, be pressure target value is deducted pressure change initial value, the difference of gained is multiplied by a heat storage coefficient (K1) again, and the result of gained is this energy requirement amount.
Wherein, the deterministic process of above-mentioned heat storage coefficient K1 is: monoblock be in hot after, drop into DEH loop of power circuit control mode, keep the power of the assembling unit, pressure, each major parameters such as Stream temperature degree are stablized.Obtain current boiler pressure P1, steam coal amount step is increased input x, and final pressure is stabilized in P2.Now, then the value of this heat storage coefficient K1 can be asked to be | x/ (P2-P1) |.
Above-mentioned equilibrium of supply and demand judging unit 5, enters boiler energy for obtaining one, and according to energy requirement amount and enter boiler energy and judge whether current supply and demand balances.After obtaining above-mentioned energy requirement amount, this energy requirement amount and one is entered boiler energy and compares, thus can judge whether current system is in equilibrium of supply and demand state.As shown in Figure 5, particularly, be deduct this by this energy requirement amount to enter boiler energy, judge the magnitude relationship of gained difference and 0.When this difference is less than or equal to 0, then can the current state being in the equilibrium of supply and demand of identifying unit unit, then do not need to add coal amount again, make monoblock keep current state; If this difference is greater than 0, then illustrates that monoblock is current and be not in the equilibrium of supply and demand, also needing to regulate by adding coal amount.
Above-mentioned feed-forward signal generation unit 6 carries out the second rate limit, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal for the coal supply rate score preset.Particularly, this coal supply rate score can set according to the needs of system cloud gray model, and, as shown in Figure 6, when above-mentioned pressure set points relative to original pressure desired value for rising or declining time, respectively corresponding different coal supply rate score: setting feedforward institute produces coal supply rate score, and to export rear be a.When pressure set points is decline relative to original pressure desired value, this coal supply rate score is K2; When pressure set points relative to original pressure desired value for rise time, this coal supply rate score is K3, wherein, K3 be on the occasion of, K2 is negative value.According to the situation of pressure set points, the coal supply rate score a of output can get K2 or K3 accordingly.
Further, based on the decision process that above-mentioned equilibrium of supply and demand judging unit 5 performs, the output valve of this coal supply rate score is limited: when the current equilibrium of supply and demand of monoblock, then the final coal supply rate score a exported gets 0, namely the active cell unit equilibrium of supply and demand is represented, without the need to adding more coal amount again; And when the current unbalanced supply-demand of monoblock, then need to carry out rate limit to coal supply rate score a, limit the speed increasing or reduce coal amount, and a feed-forward signal can be generated according to the coal supply rate score after rate limit, as the basis of feedforward control.
Above-mentioned coal amount instruction generation unit 7, for obtaining current actual pressure value, sends actual pressure value and new pressure set points into PID controller, and generates the instruction of coal amount according to the output quantity of PID controller and feed-forward signal.
Obtain the current actual pressure value being in the monoblock of running status, and this actual pressure value is together transferred to PID controller with the new pressure set points generated according to original pressure desired value carry out pressure adjustment, PID controller exports the Output pressure amount through overregulating, the feed-forward signal this Output pressure amount and feed-forward signal generation unit 6 generated is superimposed, again through receiving and distributing the station MA that automatically switches, the instruction of final generation coal amount, with the coal amount in control module unit.
It should be noted that, when equilibrium of supply and demand judging unit 5 identifying unit unit is current be in the equilibrium of supply and demand state time, then the coal supply rate score in feed-forward signal is 0, shows without the need to adding more coal amount.And when equilibrium of supply and demand judging unit 5 judges current supply and demand and be uneven, the coal supply rate score through rate limit that can generate according to feed-forward signal generation unit 6 carries out integral and calculating, the overall coal amount that need add is obtained according to this coal supply rate score, and this overall coal amount is multiplied by a unit of coal energy parameter K4, generate and above-mentioned enter boiler energy.Thus, this can be entered boiler energy to be applied to above-mentioned equilibrium of supply and demand judging unit 5 further and again to judge whether the monoblock added after corresponding coal amount is in the process of the state of the equilibrium of supply and demand.
The monoblock main vapour pressure feedforward control device of the embodiment of the present invention mainly has the following advantages:
(1) energy entering burner hearth by quantitatively calculating boiler controls coal amount, makes control effects more accurate.
(2) pressure set points to carry out coal amount early stage fast super add/surpass subtract, improve pressure-responsive speed, minimizing boiler time delay.
One of ordinary skill in the art will appreciate that the hardware that all or part of step realized in above-described embodiment method can carry out instruction relevant by program has come, this program can be stored in a computer read/write memory medium, such as ROM/RAM, magnetic disc, CD etc.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a monoblock main vapour pressure feed forward control method, is characterized in that, described method comprises:
Receive an original pressure desired value, make described original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generate the pressure set points of simulation actual pressure;
Receive a pressure target value, make described pressure target value after overrange restriction, first rate restriction and three rank inertial elements, generate the new pressure set points of simulation actual pressure;
Control actual pressure value from described pressure set points to described new pressure set points change, and current actual pressure value is locked as pressure change initial value;
According to described pressure target value and pressure change forming initial fields energy requirement amount;
Obtain and one enter boiler energy, and according to described energy requirement amount and enter boiler energy and judge whether current supply and demand balances;
Second rate limit is carried out, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal to a coal supply rate score preset;
Obtain current actual pressure value, described actual pressure value and new pressure set points are sent into PID controller, and generate the instruction of coal amount according to the output quantity of PID controller and described feed-forward signal.
2. monoblock main vapour pressure feed forward control method according to claim 1, it is characterized in that, described method also comprises:
Integral and calculating is carried out to the coal supply rate score through the second rate limit, generates an integral result;
Described integral result is multiplied by a unit of coal energy parameter, described in generation, enters boiler energy.
3. monoblock main vapour pressure feed forward control method according to claim 1, is characterized in that, according to described energy requirement amount and enter boiler energy and judge whether current supply and demand balances, and comprising:
Judge described energy requirement amount deduct described in enter boiler energy difference whether be less than or equal to 0;
If so, then the current equilibrium of supply and demand is judged; Otherwise judge current unbalanced supply-demand.
4. monoblock main vapour pressure feed forward control method according to claim 3, is characterized in that, when judging the present energy equilibrium of supply and demand, the described boiler energy that enters is carried out clearing reset.
5. monoblock main vapour pressure feed forward control method according to claim 1, is characterized in that, according to described pressure target value and pressure change forming initial fields energy requirement amount, comprising:
Described pressure target value is deducted the difference of described pressure change initial value gained, be multiplied by a heat storage coefficient, the energy requirement amount described in generation.
6. monoblock main vapour pressure feed forward control method according to claim 1, is characterized in that, generates the instruction of coal amount, comprising according to the output quantity of PID controller and described feed-forward signal:
After described output quantity is superposed with described feed-forward signal, the coal amount instruction described in being generated by station of automatically switching on the other hand.
7. a monoblock main vapour pressure feedforward control device, is characterized in that, described device comprises:
Pressure set points generation unit, for receiving an original pressure desired value, making described original pressure desired value after overrange restriction, first rate restriction and three rank inertial elements, generating the pressure set points of simulation actual pressure;
New pressure set points generation unit, for receiving a pressure target value, making described pressure target value after overrange restriction, first rate restriction and three rank inertial elements, generating the new pressure set points of simulation actual pressure;
Pressure change initial value lock cell, for controlling actual pressure value from described pressure set points to described new pressure set points change, and is locked as pressure change initial value by current actual pressure value;
Energy requirement amount generation unit, for changing forming initial fields energy requirement amount according to described pressure target value and pressure;
Equilibrium of supply and demand judging unit, enters boiler energy for obtaining one, and according to described energy requirement amount and enter boiler energy and judge whether current supply and demand balances;
Feed-forward signal generation unit, carries out the second rate limit, if current unbalanced supply-demand, using the coal supply rate score after the second rate limit as feed-forward signal for the coal supply rate score preset;
Coal amount instruction generation unit, for obtaining current actual pressure value, sends described actual pressure value and new pressure set points into PID controller, and generates the instruction of coal amount according to the output quantity of PID controller and described feed-forward signal.
8. monoblock main vapour pressure feedforward control device according to claim 7, it is characterized in that, described device also comprises:
Integral result generation unit, for carrying out integral and calculating to the coal supply rate score through the second rate limit, generates an integral result;
Enter boiler energy generation unit, for described integral result is multiplied by a unit of coal energy parameter, described in generation, enter boiler energy.
9. monoblock main vapour pressure feedforward control device according to claim 8, is characterized in that, described equilibrium of supply and demand judging unit specifically for:
Judge described energy requirement amount deduct described in enter boiler energy difference whether be less than or equal to 0;
If so, then the current equilibrium of supply and demand is judged; Otherwise judge current unbalanced supply-demand.
10. monoblock main vapour pressure feedforward control device according to claim 9, it is characterized in that, described device also comprises: enter boiler energy and reset reset unit, when judge the present energy equilibrium of supply and demand time, described in enter boiler energy reset reset unit by described enter boiler energy carry out clearings reset.
11. monoblock main vapour pressure feedforward control devices according to claim 7, is characterized in that, described energy requirement amount generation unit specifically for:
Described pressure target value is deducted the difference of described pressure change initial value gained, be multiplied by a heat storage coefficient, the energy requirement amount described in generation.
12. monoblock main vapour pressure feedforward control devices according to claim 7, is characterized in that, described coal amount instruction generation unit specifically for:
After described output quantity being superposed with described feed-forward signal, generate the instruction of described coal amount by station of automatically switching on the other hand.
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| CN113110631B (en) * | 2021-03-29 | 2023-10-24 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Main steam pressure control method for thermal power plant |
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