CN105402713A - Control method, equipment and system for boiler-turbine coordinated system - Google Patents
Control method, equipment and system for boiler-turbine coordinated system Download PDFInfo
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- CN105402713A CN105402713A CN201511009208.0A CN201511009208A CN105402713A CN 105402713 A CN105402713 A CN 105402713A CN 201511009208 A CN201511009208 A CN 201511009208A CN 105402713 A CN105402713 A CN 105402713A
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- load
- value
- boiler
- pressure divergence
- turbine systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
Abstract
The invention discloses a control method, equipment and a system for a boiler-turbine coordinated system, which belong to the field of automatic control of a coal-fired generator set. The method comprises the steps of determining a load process according to a load value and a load target value of the boiler-turbine coordinated system, wherein the load process is a load-up process, a load-down process or a stable load process; determining pressure deviation feedforward quantity according to the determined load process and pressure deviation differential quantity, and outputting the determined pressure deviation feedforward quantity, so as to control the generator set of the boiler-turbine coordinated system to operate. According to the control method, the pressure deviation dynamic compensation and the main control output of a boiler are in the same direction, so that the load rate reduction caused by the difference between the increment direction of the pressure deviation differential quantity and the main control output direction of the boiler is avoided, and the effectiveness of the whole boiler-turbine coordinated control system is increased.
Description
Technical field
The present invention relates to automation field, particularly, relate to a kind of control method for Boiler-Turbine Systems, a kind of control appliance for Boiler-Turbine Systems and a kind of control system for Boiler-Turbine Systems.
Background technology
Turbine-boiler coordinated control system is integrally considered monoblock, the load instruction requirement that dispatching patcher that what it can ensure that unit makes the load of unit fast as far as possible under the prerequisite of safe and stable operation follow sends, for boiler, it is that boiler master instruction is to control the operation of boiler that boiler-turbine coordinated controls the final control instruction produced.
And in prior art, boiler master instruction is exported by PID adjuster and adds that two feed-forward signals provide, the deviation being input as main steam engine pressure target value and actual main steam engine force value of PID adjuster.Section 1 feedforward is the static state feedforward formed by unit load instruction.Section 2 feedforward is Control platform in order to improve main steam pressure, and the differential feedforward amount produced according to pressure divergence is as the energy compensating improving main steam pressure regulation quality.
But, for the cooperation control of Thermal Power Station, there are the following problems for this derivative compensation control logic: the increase causing pressure divergence differential to export according to the positive-negative relationship of pressure divergence change or the characteristic of reduction produce bad effect sometimes in practical application is produced.Such as, when load up, the output increase of boiler master has carried out the increase of fuel, feedwater thus has reached the object improving unit output.But in lifting unit load process, likely pressure divergence occurs that suddenly negative value causes the differential producing negative sense to export (namely differential exports to the change of reduction direction), this decline that will boiler master caused to export, thus cause the decline of boiler load up rate, namely reduce the Load Regulation ability of unit.In like manner, in load down process, reduction is also reduced exerting oneself of unit by the output of boiler master instruction fast, but under this operating mode main steam engine pressure divergence be on the occasion of time, the micro component of pressure divergence exports can to the direction variation increased, and the generation of this situation also will cause the decline of unit load down speed.
Namely lack pressure divergence dynamic compensation in prior art and boiler master exports (instruction) control method in the same way, equipment and system, can not ensure that the increment direction of pressure divergence micro component and boiler master export in the same way.
Summary of the invention
The problem of the unit load rate reduction do not caused in the same way is exported for the increment direction of the pressure divergence micro component existed in prior art and boiler master, the invention provides a kind of control method for Boiler-Turbine Systems, the method comprises: according to load value and the load desired value determination load process of Boiler-Turbine Systems, described load process is load up process, load down process or steady state load process; And according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount and by determined pressure divergence feedforward amount output, to control the operation of the unit of Boiler-Turbine Systems; Wherein said pressure divergence micro component is carry out the pressure divergence value after differential calculation to the pressure divergence between the main steam engine force value of Boiler-Turbine Systems and main steam engine pressure target value.
Correspondingly, present invention also offers a kind of control appliance for Boiler-Turbine Systems, this equipment comprises: load judge module, for according to the load value of Boiler-Turbine Systems and load desired value determination load process, described load process is load up process, load down process or steady state load process; And for according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount; Output module, is connected with described load judge module, for exporting, determined pressure divergence feedforward amount to control the operation of the unit of Boiler-Turbine Systems; And differential algorithm module, be connected with described load judge module, for carrying out differential calculation to obtain pressure divergence micro component to the pressure divergence between the main steam engine force value of Boiler-Turbine Systems and main steam engine pressure target value.
In addition, present invention also offers a kind of control system for Boiler-Turbine Systems, this system comprises: load-measuring device, for obtaining the load value in described Boiler-Turbine Systems; Pressure sensor, for obtaining the main steam engine force value of the boiler in Boiler-Turbine Systems; And the control appliance for Boiler-Turbine Systems provided by the present invention, the described control appliance for Boiler-Turbine Systems is connected with described load harvester and described pressure sensor respectively.
Adopt the control method for Boiler-Turbine Systems provided by the invention, equipment, and system, by according to the load value of Boiler-Turbine Systems and load desired value determination load process, (described load process is load up process, load down process, or steady state load process), and afterwards according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount and by determined pressure divergence feedforward amount output, to control the operation of the unit of Boiler-Turbine Systems, pressure divergence dynamic compensation can be realized and boiler master exports (instruction) in the same way, namely ensure that the increment direction of pressure divergence micro component and boiler master export in the same way, avoid because the increment direction of pressure divergence micro component and boiler master export the not generation of the unit load rate reduction caused in the same way, substantially increase the validity of whole turbine-boiler coordinated control system.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the schematic diagram of the control appliance for Boiler-Turbine Systems according to one embodiment of the present invention; And
Fig. 2 is the schematic flow diagram of the control method for Boiler-Turbine Systems according to one embodiment of the present invention.
Description of reference numerals
100 differential algorithm module 200 load judge module 300 output modules
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
To illustrate thought of the present invention below, but these examples be to be understood that are non-limiting example, protection scope of the present invention is not limited thereto:
In order to thought of the present invention is clearly described, the control system below for Boiler-Turbine Systems is that example is described in detail control procedure provided by the present invention.Such as, this control system being used for Boiler-Turbine Systems can comprise: load harvester, and for obtaining the load value in described Boiler-Turbine Systems, wherein said load harvester can be any device that can obtain described load value; Pressure sensor, for obtaining the main steam engine force value of the boiler in Boiler-Turbine Systems, described load harvester is similar to prior art with function with the layout of pressure sensor, does not repeat them here; And the control appliance for Boiler-Turbine Systems provided by the present invention (will describe in detail hereinafter), the described control appliance for Boiler-Turbine Systems is connected with described load harvester and described pressure sensor respectively, to receive current loads value and main steam engine force value from load harvester and pressure sensor respectively.
Fig. 1 is the schematic diagram of the control appliance for Boiler-Turbine Systems according to one embodiment of the present invention, as shown in Figure 1, this equipment can comprise: load judge module 200, for according to the load value of Boiler-Turbine Systems and load desired value determination load process, described load process is load up process, load down process or steady state load process; And afterwards according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount; Output module 300, is connected with described load judge module 200, for exporting, determined pressure divergence feedforward amount to control the operation of the unit of Boiler-Turbine Systems; And differential algorithm module 100, be connected with described load judge module 200, for carrying out differential calculation to obtain pressure divergence micro component to the pressure divergence between the main steam engine force value of Boiler-Turbine Systems and main steam engine pressure target value.Wherein said load desired value and main steam engine pressure target value can be stored in advance in the control appliance for Boiler-Turbine Systems, or input in this equipment according to actual conditions via control panel etc.
Adopt such embodiment, because determined pressure divergence feedforward amount is determined according to different load process and pressure divergence micro component, the increase and decrease of pressure divergence micro component is conformed to load process, therefore, it is possible to realize pressure divergence dynamic compensation and boiler master exports (instruction) in the same way, namely ensure that the increment direction of pressure divergence micro component and boiler master export in the same way, avoid because the increment direction of pressure divergence micro component and boiler master export the not generation of the unit load rate reduction caused in the same way, substantially increase the validity of whole turbine-boiler coordinated control system.
Particularly, the load deviation between described load value and described load desired value and load threshold value can compare by described load judge module 200; Be load up process, load down process or steady state load process according to compared result determination load process.
Preferably, described load threshold value can comprise load up threshold value and load down threshold value; Described load judge module 200 can comprise load up judge module, load down judge module and steady state load judge module, wherein:
Described load up judge module be used for load deviation between described load desired value and described load value on the occasion of and determine when exceeding load up threshold value (such as, 5MW) that load process is load up process;
Described load down judge module is used for load deviation between described load desired value and described load value and is negative value and lower than determining when load down threshold value (such as ,-5MW) that load process is load down process; And
Described steady state load judge module be used for load deviation between described load desired value and described load value between load up threshold value and described load down threshold value determine that load process is steady state load process.
Preferably, described load up judge module can comprise signed magnitude arithmetic(al) module, to determine pressure divergence feedforward amount by taking absolute value to pressure divergence micro component, namely when judging that load process is load up, ensure pressure divergence micro component be on the occasion of, to realize pressure divergence dynamic compensation and boiler master exports in the same way.
And, described load down judge module can comprise signed magnitude arithmetic(al) module and multiplying module, to determine pressure divergence feedforward amount by taking absolute value to pressure divergence micro component and being multiplied with negative one by the pressure divergence micro component after taking absolute value, namely when judging that load process is load down, ensure that pressure divergence micro component is negative value, to realize pressure divergence dynamic compensation and boiler master exports in the same way.
And steady state load judge module, when determined load process is steady state load process, is null value determination pressure divergence feedforward amount by arranging described pressure divergence micro component, to ensure the stable state of whole system.
According to another embodiment of the invention; control system for Boiler-Turbine Systems provided by the present invention can also comprise the proportional-integral-differential PID controller exporting boiler master instruction; this PID controller can carry out PID control to the pressure divergence between main steam engine force value and main steam engine pressure target value; because the control procedure of PID controller is same as the prior art; therefore; in order to not obscure protection scope of the present invention, do not repeat them here.
And the present invention unlike the prior art, the output (namely as above described by embodiment, the output of pressure divergence dynamic compensation) of output module 300 provided by the present invention and the output of PID controller are added the operation of the unit exporting (instruction) to control Boiler-Turbine Systems as boiler master by an adder.Adopt such embodiment can substitute control system of the prior art, realize pressure divergence dynamic compensation and boiler master exports in the same way.
Fig. 2 is the schematic flow diagram of the control method for Boiler-Turbine Systems according to one embodiment of the present invention, and as shown in Figure 2, the method can comprise the following steps:
Step 1001, according to load value and the load desired value determination load process of Boiler-Turbine Systems, described load process is load up process, load down process or steady state load process; And
Step 1002, according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount and by determined pressure divergence feedforward amount output, to control the operation of the unit of Boiler-Turbine Systems; Wherein said pressure divergence micro component is carry out the pressure divergence value after differential calculation to the pressure divergence between the main steam engine force value of Boiler-Turbine Systems and main steam engine pressure target value.
Preferably, comprise according to the load value of Boiler-Turbine Systems and load desired value determination load process: the load deviation between described load value and described load desired value and load threshold value are compared; Be load up process, load down process or steady state load process according to compared result determination load process.
Preferably, comprising according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount: when determined load process is load up process, determining pressure divergence feedforward amount by taking absolute value to described pressure divergence micro component; When determined load process is load down process, determine pressure divergence feedforward amount by taking absolute value to described pressure divergence micro component and being multiplied with negative one by the pressure divergence micro component after taking absolute value; And when determined load process is steady state load process, be null value determination pressure divergence feedforward amount by arranging described pressure divergence micro component.
Preferably, described load threshold value comprises load up threshold value and load down threshold value; According to compared result determination load process be load up process, load down process or steady state load process comprise:
Load deviation between described load desired value and described load value be on the occasion of and exceed load up threshold value, determine that load process is load up process;
Load deviation between described load desired value and described load value be negative value and lower than load down threshold value, determine that load process is load down process; And
Load deviation between described load desired value and described load value is between load up threshold value and described load down threshold value, determine that load process is steady state load process.
Preferably, determined pressure divergence feedforward amount output is added with the output of the PID controller in described Boiler-Turbine Systems, to control the operation of the unit of Boiler-Turbine Systems.
Should be understood that, each detailed description of the invention of the above-mentioned control method for Boiler-Turbine Systems, all do in for the control appliance of Boiler-Turbine Systems and the embodiment of system and explained (as mentioned above), do not repeated them here.And; those skilled in the art can according to of the present invention any one that openly select in above-mentioned various embodiment; or select the combination of above-mentioned various embodiment to be configured for control appliance and the system of Boiler-Turbine Systems, and other replacement embodiment also fall into protection scope of the present invention.
In sum, adopt the control method for Boiler-Turbine Systems provided by the invention, equipment and system, pressure divergence dynamic compensation can be realized and boiler master exports (instruction) in the same way, namely ensure that the increment direction of pressure divergence micro component and boiler master export in the same way, avoid because the increment direction of pressure divergence micro component and boiler master export the not generation of the unit load rate reduction caused in the same way, substantially increase the validity of whole turbine-boiler coordinated control system.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. for a control method for Boiler-Turbine Systems, it is characterized in that, the method comprises:
According to load value and the load desired value determination load process of Boiler-Turbine Systems, described load process is load up process, load down process or steady state load process; And
According to determined load process and pressure divergence micro component determination pressure divergence feedforward amount and by determined pressure divergence feedforward amount output, to control the operation of the unit of Boiler-Turbine Systems;
Wherein said pressure divergence micro component is carry out the pressure divergence value after differential calculation to the pressure divergence between the main steam engine force value of Boiler-Turbine Systems and main steam engine pressure target value.
2. method according to claim 1, is characterized in that, comprises according to the load value of Boiler-Turbine Systems and load desired value determination load process:
Load deviation between described load value and described load desired value and load threshold value are compared;
Be load up process, load down process or steady state load process according to compared result determination load process.
3. method according to claim 1, is characterized in that, comprises according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount:
When determined load process is load up process, determine pressure divergence feedforward amount by taking absolute value to described pressure divergence micro component;
When determined load process is load down process, determine pressure divergence feedforward amount by taking absolute value to described pressure divergence micro component and being multiplied with negative one by the pressure divergence micro component after taking absolute value; And
When determined load process is steady state load process, be null value determination pressure divergence feedforward amount by arranging described pressure divergence micro component.
4. method according to claim 2, is characterized in that, described load threshold value comprises load up threshold value and load down threshold value; According to compared result determination load process be load up process, load down process or steady state load process comprise:
Load deviation between described load desired value and described load value be on the occasion of and exceed load up threshold value, determine that load process is load up process;
Load deviation between described load desired value and described load value be negative value and lower than load down threshold value, determine that load process is load down process; And
Load deviation between described load desired value and described load value is between load up threshold value and described load down threshold value, determine that load process is steady state load process.
5. the method any one of claim 1-4 described in claim, is characterized in that, determined pressure divergence feedforward amount is exported and is added with the output of the PID controller in described Boiler-Turbine Systems, to control the operation of the unit of Boiler-Turbine Systems.
6. for a control appliance for Boiler-Turbine Systems, it is characterized in that, this equipment comprises:
Load judge module, for according to the load value of Boiler-Turbine Systems and load desired value determination load process, described load process is load up process, load down process or steady state load process; And for according to determined load process and pressure divergence micro component determination pressure divergence feedforward amount;
Output module, is connected with described load judge module, for exporting, determined pressure divergence feedforward amount to control the operation of the unit of Boiler-Turbine Systems; And
Differential algorithm module, is connected with described load judge module, for carrying out differential calculation to obtain pressure divergence micro component to the pressure divergence between the main steam engine force value of Boiler-Turbine Systems and main steam engine pressure target value.
7. equipment according to claim 6, is characterized in that, described load judge module is used for: the load deviation between described load value and described load desired value and load threshold value are compared; Be load up process, load down process or steady state load process according to compared result determination load process.
8. equipment according to claim 7, is characterized in that, described load threshold value comprises load up threshold value and load down threshold value; Described load judge module comprises load up judge module, load down judge module and steady state load judge module, wherein:
Described load up judge module be used for load deviation between described load desired value and described load value be on the occasion of and exceed load up threshold value determine that load process is load up process;
Described load down judge module is used for load deviation between described load desired value and described load value and is negative value and lower than determining when load down threshold value that load process is load down process; And
Described steady state load judge module be used for load deviation between described load desired value and described load value between load up threshold value and described load down threshold value determine that load process is steady state load process.
9. equipment according to claim 8, is characterized in that, described load up judge module comprises signed magnitude arithmetic(al) module, to determine pressure divergence feedforward amount by taking absolute value to pressure divergence micro component; And described load down judge module comprises signed magnitude arithmetic(al) module and multiplying module, to determine pressure divergence feedforward amount by taking absolute value to pressure divergence micro component and being multiplied with negative one by the pressure divergence micro component after taking absolute value.
10. for a control system for Boiler-Turbine Systems, it is characterized in that, this system comprises:
Load harvester, for obtaining the load value in described Boiler-Turbine Systems;
Pressure sensor, for obtaining the main steam engine force value of the boiler in Boiler-Turbine Systems; And
The control appliance for Boiler-Turbine Systems according to any one of claim 6-9, the described control appliance for Boiler-Turbine Systems is connected with described load harvester and described pressure sensor respectively.
11. systems according to claim 10, is characterized in that, this system also comprises:
Proportional-integral-differential PID controller, for carrying out PID control to the pressure divergence between main steam engine force value and main steam engine pressure target value;
Adder, is added with the output of described PID controller for determined pressure divergence feedforward amount being exported, to control the operation of the unit of Boiler-Turbine Systems.
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| CN108954286A (en) * | 2018-05-10 | 2018-12-07 | 湖南省湘电试验研究院有限公司 | A kind of calculation method and system of boiler input dynamic assisted instruction |
| CN112947609A (en) * | 2021-01-27 | 2021-06-11 | 山东中实易通集团有限公司 | Main steam pressure setting control strategy and system for sliding pressure operation unit |
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