CN101509656B - Supercritical DC furnace synthesis type coordinating control method - Google Patents
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Abstract
The invention relates to a comprehensive method for harmonizing and controlling a supercritical monotube boiler, comprising the steps as follows: 1) logic configuration of a traditional harmonizing and controlling system is carried out, the differential signal of the practical load given value is added in main control circuit of the boiler of the traditional harmonizing and controlling system, and interfaces are preserved for an increment-typed state observer, an inertia suppressor and a heat value observer; 2) the logic configuration of the increment-typed state observer is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as a feedforward signal for controlling the combustion rate; 3) the logic configuration of the inertia suppressor is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as the feedforward signal for controlling the combustion rate; 4) the logic configuration of the water-supply increment-typed state observer is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as a feedforward signal for controlling the water-supply; 5) the heat value observer is added in the heat value calculation circuit of the traditional harmonizing and controlling system, thus leading the heating-value signal of the quantity of the coal entering the boiler to be corrected. The method obtains excellent control effect during the controlling to the supercritical monotube boiler.
Description
Technical field
The present invention relates to a kind of thermal technology's autocontrol method, particularly about a kind of supercritical DC furnace synthesis type coordinating control method.
Background technology
Along with the continuous development of China's electric utility, the generate output of unit thermal power generation unit also is greatly improved.Active cell thermal power generation unit is changed to 600MW supercritical DC furnace, 1000MW ultra supercritical direct current stove by the subcritical drum boiler of original 300MW.But, China's thermal technology's automation field that is controlled at for supercritical DC furnace still is a newer research field, and because supercritical DC furnace does not have drum, supercritical unit working medium stream and energy stream intercouple, thereby at each control loop, as existing very strong non-linear coupling between feedwater, steam temperature and the load control loop.This control method for supercritical DC furnace is also had higher requirement.
Summary of the invention
At the problems referred to above, the objective of the invention is to propose a kind of supercritical DC furnace synthesis type coordinating control method, make the supercritical DC furnace unit efficiently participate in network load scheduling, and make the supercritical DC furnace unit in dispatching cycle, can adapt to load timely and accurately significantly to change.
For achieving the above object, the present invention takes following technical scheme: a kind of supercritical DC furnace synthesis type coordinating control method, it may further comprise the steps: the Logical Configuration that 1) carries out traditional coordinated control system, in the boiler master loop of traditional coordinated control system, add the differential signal of actual load setting value, and be that increment type state observer, inertia TVS and value observer reserve interface; 2) carry out the Logical Configuration of increment type state observer, and its output is incorporated in traditional coordinated control system feed-forward signal as combustion rate control; 3) carry out the Logical Configuration of inertia TVS, and its output is incorporated in traditional coordinated control system feed-forward signal as combustion rate control; 4) the feed water Logical Configuration of increment type state observer, and its output is incorporated in traditional coordinated control system as the feed-forward signal of giving water management; 5) in the calorific value calculation loop of traditional coordinated control system, introduce a value observer, proofread and correct the caloric value signal of the coal amount that enters boiler.
Carry out step 2) time, the content that comprises following two aspects: 1. utilize probabilistic method, according to the mathematical expectation of loading in the long-time running and the actual corresponding relation of coal amount is obtained, the functional relation of load and the coal amount of adjusting under the different load, thereby the parameter to described incremental state observer is adjusted, and finds out under the different operating modes relation curve between load and the coal amount; 2. according to the design concept of increment type state observer, relation curve between described load and the coal amount is introduced described increment type state observer as the reference signal, through drawing the feedback of status value after the calculating of the algorithm in the described incremental state observer, introduce described feedback of status value in the boiler master system loop of described traditional coordinated control system as feed-forward signal then, the coal amount that the various loads of monoblock are corresponding is down located in advance, strengthen the response speed of boiler.
When carrying out step 3), the content that comprises following three aspects: 1. when the logical signal set of lifting load, in described boiler master loop, add one and just playing control loop, describedly just playing feedforward that control loop provides an extra increase and decrease coal amount and instructing described boiler master loop, in order to improve the response of boiler control, should instruction disappear through the some time; 2. when the logical signal of lifting load resets, in described boiler master loop, add an anti-control loop of playing, describedly instead play feedforward that control loop provides an extra increase and decrease coal amount and instruct described boiler master loop,, should instruction disappear through the some time in order to prevent the toning of boiler pressure; 3. in described boiler master loop, add one and quicken control loop, described acceleration control loop instructs to described boiler master loop through the feedforward that function generator calculates an extra increase and decrease coal amount of output according to current load deviation, makes it increase or reduce the part of coal amount more extraly.
When carrying out step 3), the content that comprises following three aspects: 1. when the logical signal set of lifting load, in described boiler master loop, add one and just playing control loop, describedly just playing feedforward that control loop provides an extra increase and decrease coal amount and instructing described boiler master loop, in order to improve the response of boiler control, should instruction disappear through the some time; 2. when the logical signal of lifting load resets, in described boiler master loop, add an anti-control loop of playing, describedly instead play feedforward that control loop provides an extra increase and decrease coal amount and instruct described boiler master loop,, should instruction disappear through the some time in order to prevent the toning of boiler pressure; 3. in described boiler master loop, add one and quicken control loop, described acceleration control loop instructs to described boiler master loop through the feedforward that function generator calculates an extra increase and decrease coal amount of output according to current load deviation, makes it increase or reduce the part of coal amount more extraly.
When carrying out step 4), the content that comprises following two aspects: the input variable of 1. described feedwater increment type state observer comprises feedwater flow, the load instruction, the separator outlet pressure and temperature, output is that the increment type feedback of status goes to change the feedwater control instruction, the deviation of the feedwater flow setting value that goes out feedwater flow with by the load command calculations is imitated actual boiler feed water heating by a plurality of inertial elements process, the final output of inertial element and the enthalpy of separator outlet steam compare with the deviation of the enthalpy setting value that the load command calculations goes out, its drift correction inertial element finally makes the feedwater flow deviation behind the inertial element equate with separator outlet enthalpy deviation; 2. get intermediateness variable in each inertial element as the feedback of described feedwater increment type state observer, revise the feedwater control instruction.
The present invention is owing to take above technical scheme, it has the following advantages: 1, the present invention has increased the feedforward of increment type state observer as combustion rate control in traditional coordinated control system, so that the variation tendency of prediction vapour pressure, revise the output in boiler master loop, thereby effectively overcome the output characteristics of boiler master loop PID adjuster and the phenomenon of caused vapour pressure toning of boiler inertia or vibration, supercritical DC furnace vapour pressure stable played critical effect.2, the present invention in traditional coordinated control system, increased just have play, counter playing and the feedforward of the inertia TVS of accelerator function as combustion rate control, reduce the influence of boiler sluggishness and inertia to greatest extent, improved the dynamic response capability of unit varying duty lifting load.3, the present invention has increased feedwater increment type state observer as the feedforward of giving water management in traditional coordinated control system, can well improve the control effect of supercritical DC furnace separator outlet steam, guarantees the safe and stable operation of unit.4, the present invention introduces the value observer in the prior art in the calorific value calculation loop of traditional coordinated control system, can well detect coal-fired calorific value, revise the Coal-fired capacity that enters boiler in real time, can well guarantee the cooperation of fuel and feedwater for supercritical DC furnace, make unit that the situation of overtemperature or low temperature not take place, improve the control stability of unit.In sum, the present invention is in the coordination control of supercritical DC furnace with to the characteristic that has taken into full account supercritical unit in the water management, organically combine the coordination of supercritical DC furnace control with to water management, and in each control, increase advanced control algolithm such as increment type state observer, inertia TVS and value observer, be a synthesis type coordinating control method.The present invention has obtained excellent control effect in the control for supercritical DC furnace.
Description of drawings
Fig. 1 is a whole control scheme logic chart of the present invention
Fig. 2 is a feedwater increment type state observer logic chart of the present invention
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, basic ideas of the present invention are: increased the feedforward as combustion rate control of increment type state observer and inertia TVS in traditional coordinated control system, and increased feedwater increment type state observer as the feedforward of giving water management, be used to improve dynamic effect to water management.And,, therefore in the calorific value calculation loop of traditional coordinated control system, having increased value observer because certain heat is wanted corresponding certain water for supercritical DC furnace, this observer is revised coal-fired heat signal in real time.
Based on above basic ideas, method of the present invention may further comprise the steps:
1, carries out the Logical Configuration of traditional coordinated control system, in the boiler master loop of traditional coordinated control system (M/A), add the differential signal of actual load setting value, and be that increment type state observer, inertia TVS and value observer reserve interface.In the dynamic process of monoblock lifting load, the coal amount setting value of advancing stove is with load variations, and the then actual coal amount of advancing stove gets soon than coal amount set point change.Therefore, the present invention adds the differential signal of actual load setting value in the boiler master loop, effect through the boiler master pi regulator forms the BM command signal, limit the actual coal amount setting value command signal that computing obtains through intersecting again, so just than the coal amount setting value big (with regard to load up) of sending into the increment type state observer.
2, carry out the Logical Configuration of increment type state observer, and its output be incorporated into the feedforward of controlling as combustion rate in traditional coordinated control system, specifically comprise the content of following two aspects:
1) utilizes probabilistic method, according to the mathematical expectation of loading in the long-time running and the actual corresponding relation of coal amount is obtained, the functional relation of load and the coal amount of adjusting under the different load, thereby the parameter to the incremental state observer is adjusted, and finds out under the different operating modes relation curve between load and the coal amount.Although the caloric value of coal is a stochastic variable, by a large amount of real time datas and the function relation curve asked for according to probability distribution, its representative be best mathematical expectation between load and the coal amount, this signal has important function in the varying duty process.
2) according to the design concept of increment type state observer, relation curve between load and the coal amount is introduced the increment type state observer as the reference signal, through drawing the feedback of status value after the calculating of the algorithm in the incremental state observer, introduce this feedback of status value in the boiler master system loop of traditional coordinated control system as feed-forward signal then, the coal amount that the various loads of monoblock are corresponding is down located in advance, strengthen the response speed of boiler.Owing in the boiler master loop, added STATE FEEDBACK CONTROL based on the increment type state observer, so that the variation tendency of prediction vapour pressure, revise the output in boiler master loop, thereby effectively overcome the output characteristics of boiler master loop PID adjuster and the phenomenon of caused vapour pressure toning of boiler inertia or vibration, supercritical DC furnace vapour pressure stable played critical effect.
3, carry out the Logical Configuration of inertia TVS, and its output is incorporated into the feedforward of controlling as combustion rate in traditional coordinated control system.The effect of inertia TVS is to reduce the influence of the sluggish and inertia of boiler to lifting load to greatest extent, and it comprises the content of following three aspects:
1) when the logical signal set of lifting load, in the boiler master loop, add and just play control loop in the prior art, this is just being played feedforward that control loop provides extra adding (subtracting) coal amount and is instructing the boiler master loop, in order to improve the response of boiler control, through this blackout of some time.
2) when the logical signal of lifting load resets, require the process of lifting load to finish this moment, but because the effect of boiler sluggishness, the coal amount that enter boiler this moment will produce excessive influence in process subsequently.Therefore, in the boiler master loop, add the anti-control loop of playing in the prior art, this is counter plays feedforward that control loop provides extra adding (subtracting) coal amount and instructs the boiler master loop, in order to prevent the toning of boiler pressure, through this blackout of some time.
3) there are delay and inertia because boiler is regulated, therefore in the boiler master loop, add one and quicken control loop.Quickening control loop and formed through a function generator by the difference signal of load instruction setting value with actual load, is non-linear ratio's adjuster.When the difference signal of load instruction setting value and actual load is big, illustrate that boiler does not catch up with the variation of steam turbine, quickening control loop instructs to the boiler master loop through the feedforward that function generator calculates output extra adding (subtracting) coal amount according to current load deviation, make it increase extraly again or minimizing part of coal amount, play " accelerator ".
4, the feed water Logical Configuration of increment type state observer, and its output is incorporated in traditional coordinated control system as the feed-forward signal of giving water management.In service at supercritical DC furnace, the steam quality of separator outlet is very important, directly affects the security of unit for the quality of water management.Therefore, the present invention has increased feedwater increment type state observer as the feedforward of giving water management in traditional coordinated control system, specifically comprise the content of following two aspects:
1) as shown in Figure 2, the input variable of feedwater increment type state observer comprises feedwater flow, the load instruction, the separator outlet pressure and temperature, output is that the increment type feedback of status goes to change the feedwater control instruction, the deviation of the feedwater flow setting value that goes out feedwater flow with by the load command calculations is imitated actual boiler feed water heating by a plurality of inertial elements process, the final output of inertial element and the enthalpy of separator outlet steam compare with the deviation of the enthalpy setting value that the load command calculations goes out, its drift correction inertial element finally makes the feedwater flow deviation behind the inertial element equate with separator outlet enthalpy deviation.
2) get intermediateness variable in each inertial element as the feedback of feedwater increment type state observer, revise the feedwater control instruction.
5, the value observer in introducing one prior art in the calorific value calculation loop of traditional coordinated control system is proofreaied and correct the caloric value signal of the coal amount that enters the boiler master loop.Because the proportioning of feedwater and coal amount is very important in supercritical DC furnace, just may be very high if feed water main steam temperature less then boiler, this has had a strong impact on the safe operation of monoblock; If during same ature of coal variation, this can cause main steam temperature lower more than feedwater will become relatively, this has also influenced the safe operation of monoblock.Therefore, the present invention introduces the value observer in the prior art in the calorific value calculation loop of traditional coordinated control system, the feasible cooperation that can be good at guaranteeing boiler heat and feedwater to water management, allow its heat of being contained of representative that the total fuel quantity that enters boiler can be real, this is very significant for supercritical DC furnace to water management.
In sum, the present invention is in the coordination control of supercritical DC furnace with to the characteristic that has taken into full account supercritical unit in the water management, organically combine the coordination of supercritical DC furnace control with to water management, and in each control, increase advanced control algolithm such as increment type state observer, inertia TVS and value observer, be a synthesis type coordinating control method.The present invention has obtained excellent control effect in the control for supercritical DC furnace.
Claims (5)
1. supercritical DC furnace synthesis type coordinating control method, it may further comprise the steps:
1) carries out the Logical Configuration of traditional coordinated control system, in the boiler master loop of traditional coordinated control system, add the differential signal of actual load setting value, and be that the first increment type state observer, inertia TVS and value observer reserve interface;
2) carry out the Logical Configuration of the first increment type state observer, and its output is incorporated in traditional coordinated control system feed-forward signal as combustion rate control;
3) carry out the Logical Configuration of inertia TVS, and its output is incorporated in traditional coordinated control system feed-forward signal as combustion rate control;
4) carry out the Logical Configuration of the second increment type state observer, and its output is incorporated in traditional coordinated control system as the feed-forward signal of giving water management;
5) in the calorific value calculation loop of traditional coordinated control system, introduce a value observer, proofread and correct the caloric value signal of the coal amount that enters boiler.
2. a kind of supercritical DC furnace synthesis type coordinating control method as claimed in claim 1 is characterized in that: carry out step 2) time, comprise the content of following two aspects:
1. utilize probabilistic method, according to the mathematical expectation of loading in the long-time running and the actual corresponding relation of coal amount is obtained, the functional relation of load and the coal amount of adjusting under the different load, thereby the parameter to the described first incremental state observer is adjusted, and finds out under the different operating modes relation curve between load and the coal amount;
2. according to the design concept of increment type state observer, relation curve between described load and the coal amount is introduced the described first increment type state observer as the reference signal, through drawing the feedback of status value after the calculating of the algorithm in the described first incremental state observer, introduce described feedback of status value in the boiler master system loop of described traditional coordinated control system as feed-forward signal then, the coal amount that the various loads of monoblock are corresponding is down located in advance, strengthen the response speed of boiler.
3. a kind of supercritical DC furnace synthesis type coordinating control method as claimed in claim 1 is characterized in that: when carrying out step 3), comprise the content of following three aspects:
1. when the logical signal set of lifting load, in described boiler master loop, add one and just playing control loop, describedly just playing feedforward that control loop provides an extra increase and decrease coal amount and instruct described boiler master loop, in order to improve the response of boiler control;
2. when the logical signal of lifting load resets, in described boiler master loop, add an anti-control loop of playing, describedly instead play feedforward that control loop provides an extra increase and decrease coal amount and instruct described boiler master loop, in order to prevent the toning of boiler pressure;
3. in described boiler master loop, add one and quicken control loop, described acceleration control loop instructs to described boiler master loop through the feedforward that function generator calculates an extra increase and decrease coal amount of output according to current load deviation, makes it increase or reduce the part of coal amount more extraly.
4. a kind of supercritical DC furnace synthesis type coordinating control method as claimed in claim 2 is characterized in that: when carrying out step 3), comprise the content of following three aspects:
1. when the logical signal set of lifting load, in described boiler master loop, add one and just playing control loop, describedly just playing feedforward that control loop provides an extra increase and decrease coal amount and instruct described boiler master loop, in order to improve the response of boiler control;
2. when the logical signal of lifting load resets, in described boiler master loop, add an anti-control loop of playing, describedly instead play feedforward that control loop provides an extra increase and decrease coal amount and instruct described boiler master loop, in order to prevent the toning of boiler pressure;
3. in described boiler master loop, add one and quicken control loop, described acceleration control loop instructs to described boiler master loop through the feedforward that function generator calculates an extra increase and decrease coal amount of output according to current load deviation, makes it increase or reduce the part of coal amount more extraly.
5. as claim 1 or 2 or 3 or 4 described a kind of supercritical DC furnace synthesis type coordinating control methods, it is characterized in that: when carrying out step 4), comprise the content of following two aspects:
The input variable of the 1. described second increment type state observer comprises feedwater flow, the load instruction, the separator outlet pressure and temperature, output is that the increment type feedback of status goes to change the feedwater control instruction, the deviation of the feedwater flow setting value that goes out feedwater flow with by the load command calculations is imitated actual boiler feed water heating by a plurality of inertial elements process, the final output of inertial element and the enthalpy of separator outlet steam compare with the deviation of the enthalpy setting value that the load command calculations goes out, the drift correction inertial element that obtains after relatively finally makes the feedwater flow deviation behind the inertial element equate with separator outlet enthalpy deviation;
2. get intermediateness variable in each inertial element as the feedback of the described second increment type state observer, revise the feedwater control instruction.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102679314A (en) * | 2012-06-04 | 2012-09-19 | 上海迪吉特控制系统有限公司 | Self-adaptive correcting method for dynamic accelerating feedforward of supercritical boiler |
| CN105955030A (en) * | 2016-06-08 | 2016-09-21 | 江苏南热发电有限责任公司 | Turbine and boiler coordination control method based on improved input weighted prediction controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102679314A (en) * | 2012-06-04 | 2012-09-19 | 上海迪吉特控制系统有限公司 | Self-adaptive correcting method for dynamic accelerating feedforward of supercritical boiler |
| CN102679314B (en) * | 2012-06-04 | 2014-01-29 | 上海迪吉特控制系统有限公司 | Self-adaptive correcting method for dynamic accelerating feedforward of supercritical boiler |
| CN105955030A (en) * | 2016-06-08 | 2016-09-21 | 江苏南热发电有限责任公司 | Turbine and boiler coordination control method based on improved input weighted prediction controller |
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