CN105020693B - Once-through Boiler intellectuality feedwater separator temperature control method based on UCPS - Google Patents
Once-through Boiler intellectuality feedwater separator temperature control method based on UCPS Download PDFInfo
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- CN105020693B CN105020693B CN201410158053.6A CN201410158053A CN105020693B CN 105020693 B CN105020693 B CN 105020693B CN 201410158053 A CN201410158053 A CN 201410158053A CN 105020693 B CN105020693 B CN 105020693B
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Abstract
The present invention relates to a kind of Once-through Boiler intellectuality feedwater separator temperature control method based on UCPS, comprise the following steps：1) in the stabilization of power grids, input signal E3=T of PID controller0T, wherein T are separator temperature, T0For temperature definite value；2) when power network application of load, feedwater is controlled using application of load model；3) when power network load shedding, feedwater is controlled using load shedding model.Compared with prior art, the present invention, which has, realizes the different control tasks that feed water, and reaches the advantages of preferably coordinating target.
Description
Technical field
It is intelligent more particularly, to a kind of Once-through Boiler based on UCPS the present invention relates to a kind of Once-through Boiler water supply control method
Feed water separator temperature control method.
Background technology
With the great-leap-forward development of domestic electrical equipment manufacture, 600MW and ratings above supercritical unit have become
Main force's unit of power network, carries main peak regulation-frequency modulation task.How unit good load adjustment ability, and energy are ensured
Reducing the cost of peak load regulation-frequency modulation assistant service turns into urgent problem instantly.
Drum boiler feedwater only influences steam water-level, does not interfere with generated output, vapour pressure and steam temperature.And supercritical unit is (straight
Flow stove) boiler capacity with confluent synchronously change, so feedwater can directly affect generated output, vapour pressure and steam temperature.It can be seen that
Supercritical unit is increasingly complex multi input, a multiple output system, due to being without solid between forced circulation and heated section
Delimit, substantial amounts of coupling phenomenon is there are between each parameter；The direct current cooker of supercritical parameter participates in thermodynamic property after peak regulation and become
Change bigger, delayed, time-varying that its dynamic characteristic is shown and non-linear just stronger；Simultaneously because supercritical once-through boiler accumulation of energy
Ability is relatively smaller, and generation load control and the contradiction that boiler parameter is controlled are just more prominent.
Feedwater can quickly change unit generation power, while response of the steam temperature to feedwater is also fast more than fuel, especially have
Larger powder processed delay medium-speed milling pulverization system.Feedwater increase, load increase, steam temperature declines, it is seen that the load of once-through boiler unit
Control is contradictory with control of steam temperature, and by the regulation varying duty that feeds water, varying duty performance is good, but Temperature Deviation is larger, on the contrary
Feedwater regulation steam temperature, then steam temperature change is smaller, but varying duty poor performance.
Current supercritical unit still continues to use the coordinated control system for being primarily adapted for use in drum boiler unit, it is difficult to meet super face
Boundary's unit operation requirement, needs to have studied a kind of new intelligent UCPS coordinated control systems for supercritical unit for this.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of based on the straight of UCPS
Flow stove intellectuality feedwater separator temperature control method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of Once-through Boiler intellectuality feedwater separator temperature control method based on UCPS, it is characterised in that including following
Step：
1) in the stabilization of power grids, input signal E3=T of PID controller0- T, wherein T are separator temperature, T0It is fixed for temperature
Value；
2) when power network application of load, feedwater is controlled using application of load model, wherein application of load model is as follows：
Temperature definite value during application of load：T0i=MAX[(T0- ρ), MIN (T0, T)] (1)
The input signal of PID controller during application of load：E3=T0i-T (2)
Wherein T0iTemperature definite value during for application of load, ρ is the temperature deviation allowed；
3) when power network load shedding, feedwater is controlled using load shedding model, wherein load shedding model is as follows：
Temperature definite value during load shedding：T0d=MIN[(T0+ ρ), MAX (T0, T)] (3)
The input signal of PID controller during load shedding：E3=T0d-T (4)
Wherein T0dTemperature definite value during for load shedding.
In power network application of load：
1) for energy multicomputer, T0i=T0, input signal E3=T of PID controller0-T；
2) for the unit that energy is low but does not transfinite, T0i=T, input signal E3=0 of PID controller；
3) for the unit that energy is low and transfinites, T0i=T0- ρ, input signal E3=T of PID controller0-ρ-T。
In power network load shedding：
1) for little energy unit, T0d=T0, input signal E3=T of PID controller0-T；
2) for the unit that energy is high but does not transfinite, T0d=T, input signal E3=0 of PID controller；
3) for the unit that energy is high and transfinites, T0d=T0+ ρ, input signal E3=T of PID controller0+ρ-T。
Compared with prior art, the present invention has advantages below：
By changing PID input deviation E3, the different control tasks that feed water are realized, reaches and preferably coordinates target.Become
During load, the control of steam temperature is suitably abandoned, control of steam turbine governing valve power is assisted, has unit and preferably continues varying duty performance,
Complete after varying duty, feedwater is smoothly transitted into control steam temperature.
Brief description of the drawings
Fig. 1 is control logic figure of the present invention；
Fig. 2 is the control logic figure of concrete application of the present invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in figure 1, Once-through Boiler intellectuality feedwater separator temperature control method of the present invention based on UCPS mainly passes through
Change PID input deviation E3, realize the different control task of feedwater, reach and preferably coordinate target.Separator temperature during varying duty
The input E3 logics of the controller of degree, such as using the control of separator enthalpy, as long as separator temperature is changed into corresponding enthalpy.
" application of load state 2 ", " load shedding state 2 " refers to return to normal steam temperature control to feedwater since the load that adds deduct
System.
When there is varying duty requirement, by the Trigger Function of varying duty state, control system is set to switch to the load shape that adds deduct
State, by handoff functionality block " T " select add deduct load when separator temperature definite value (T0iOr T0d), and selected by height
Function ">”、“<" and other calculation functions realize steam temperature definite value and E3 whole calculating.
Desuperheating water is used to adjust corresponding vapor (steam) temperature, and it is similar to feedwater on power and vapour pressure influence, simply more quicker.
The control system of intelligent UCPS desuperheating waters can refer to feedwater and perform.
DCS and existing control logic should be combined in the specific implementation, if any definite value SP and regulated variable PV PID, as long as
Change its definite value SP.
Symbol description：
T is separator temperature, T0For temperature definite value；T0iTemperature definite value during for application of load；T0dTemperature during for load shedding
Definite value, ρ is the temperature deviation allowed.
Water management is given during the stabilization of power grids
When stable, drawn by Fig. 1：E3=T0-T.Now feedwater adjusts separator temperature (or specific enthalpy), desuperheating water regulation phase
The vapor (steam) temperature answered.Feedwater by dynamic compensation, makes steam temperature keep constant, realizes decoupling of the steam temperature to BM when following the BM to change,
Feedwater, the control of desuperheating water should make Temperature Deviation try one's best reduction.Be conducive to stabilization, the economical operation of unit.Reached to water management
Control is required.
Power network have increase power requirement when give water management
When power network application of load, feedwater is controlled using application of load model, wherein application of load model is as follows：
Temperature definite value during application of load：T0i=MAX[(T0- ρ), MN (T0, T)] (1)
The input signal of PID controller during application of load：E3=T0i-T (2)
Wherein T0iTemperature definite value during for application of load, ρ is the temperature deviation allowed；
1) energy unit on the high side give water management analysis
Such as unit energy is on the high side, and steam temperature is higher, T0i=T0, PID is for adjusting separator temperature, and now desuperheating water is also assisted in
Temperature adjustment, feedwater and desuperheating water are because steam temperature is higher and increases, and vapour pressure and power rise therewith, and vapour pressure, which rises, makes pitch open greatly, accelerates
Power rise.
Visible energy unit on the high side, either vapour pressure is higher but steam temperature is higher, and the performance of its application of load can all be better than
Required value.Although the power of the assembling unit to feedwater and desuperheat water-responsive not as pitch it is fast, its influence or it is very important.
2) the relatively low unit that do not transfinite of energy give water management analysis
Due to application of load process, feedwater increases in advance, and steam temperature can typically be less than temperature definite value, such as separator temperature it is relatively low
In permissible value, obtained by formula 1：T0i=T, PID3 input are 0, are not in reduce feedwater flow because steam temperature declines, make unit
Power drop situation, now feedwater is mainly used in the auxiliary adjustment power of the assembling unit.Now desuperheating water can pass through output limiting command
Fall off rate limit the influence to power and vapour pressure.There is unit and preferably continue application of load performance.
3) the relatively low unit that transfinites of energy give water management analysis
If the relatively low temperature that shows as of energy is too low, i.e., more than permissible value, obtained if separator by formula 1：T0i=T0- ρ,
Now feedwater recovers regulation separator temperature, and same desuperheating water also returns to normal steam temperature regulation, cancels the rate limit of instruction,
Prevent steam temperature too low, it is ensured that unit safety, varying duty performance can decline.
Power network have when subtracting power requirement give water management
When power network load shedding, feedwater is controlled using load shedding model, wherein load shedding model is as follows：
Temperature definite value during load shedding：T0d-MIN[(T0+ ρ), MAX (T0, T)] (3)
The input signal of PID controller during load shedding：E3=T0d-T (4)
Wherein T0dTemperature definite value during for load shedding.
The control analysis of unit energy deviation is similar, is not further described.
Steam temperature tolerance ρ, which embodies unit, allows the degree using accumulation of heat, and ρ is bigger to allow the accumulation of heat utilized more, machine
The performance of group peak-frequency regulation is better, but Steam Temperature for Boiler change is bigger, and ρ can not exceed the margin of safety of unit operation.
During peak regulation, ρ=ρ 2 is a larger value, gives full play of the varying duty performance of unit, and power network is balanced in time
Energy.During non-larger varying duty, δ=δ 1 can be set smaller.
Claims (1)
1. a kind of Once-through Boiler intellectuality feedwater separator temperature control method based on UCPS, it is characterised in that including following step
Suddenly：
1) in the stabilization of power grids, the input signal E3=T of PID controller0- T, wherein T are separator temperature, T0For temperature definite value；
2) when power network application of load, feedwater is controlled using application of load model, wherein application of load model is as follows：
Temperature definite value during application of load：T0i=MAX [(T0-ρ),MIN(T0,T)] (1)
The input signal of PID controller during application of load：E3=T0i-T (2)
Wherein T0iTemperature definite value during for application of load, ρ is the temperature deviation allowed；
3) when power network load shedding, feedwater is controlled using load shedding model, wherein load shedding model is as follows：
Temperature definite value during load shedding：T0d=MIN [(T0+ρ),MAX(T0,T)] (3)
The input signal of PID controller during load shedding：E3=T0d-T (4)
Wherein T0dTemperature definite value during for load shedding；
In power network application of load：
1) for energy multicomputer, T0i=T0, the input signal E3=T of PID controller0-T；
2) for the unit that energy is low but does not transfinite, T0i=T, the input signal E3=0 of PID controller；
3) for the unit that energy is low and transfinites, T0i=T0- ρ, the input signal E3=T of PID controller0-ρ-T；
In power network load shedding：
1) for little energy unit, T0d=T0, the input signal E3=T of PID controller0-T；
2) for the unit that energy is high but does not transfinite, T0d=T, the input signal E3=0 of PID controller；
3) for the unit that energy is high and transfinites, T0d=T0+ ρ, the input signal E3=T of PID controller0+ρ-T。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0507730A1 (en) * | 1991-04-05 | 1992-10-07 | ABB Management AG | Apparatus for the load-dependent regulation of the feedwater flow in a forced circulation steam generator |
| CN101988697A (en) * | 2009-08-07 | 2011-03-23 | 华东电力试验研究院有限公司 | Intelligent coordinated control method for thermal power unit |
| CN101995012A (en) * | 2009-08-14 | 2011-03-30 | 华东电力试验研究院有限公司 | Thermal power unit cooperative load change control method |
| CN203175626U (en) * | 2013-03-28 | 2013-09-04 | 国家电网公司 | Power-frequency regulating system of thermal power generating unit |
| CN103604114A (en) * | 2013-11-25 | 2014-02-26 | 广东电网公司电力科学研究院 | Rapid water feeding stabilization control method based on boiler water circulation online monitoring system |
-
2014
- 2014-04-18 CN CN201410158053.6A patent/CN105020693B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0507730A1 (en) * | 1991-04-05 | 1992-10-07 | ABB Management AG | Apparatus for the load-dependent regulation of the feedwater flow in a forced circulation steam generator |
| CN101988697A (en) * | 2009-08-07 | 2011-03-23 | 华东电力试验研究院有限公司 | Intelligent coordinated control method for thermal power unit |
| CN101995012A (en) * | 2009-08-14 | 2011-03-30 | 华东电力试验研究院有限公司 | Thermal power unit cooperative load change control method |
| CN203175626U (en) * | 2013-03-28 | 2013-09-04 | 国家电网公司 | Power-frequency regulating system of thermal power generating unit |
| CN103604114A (en) * | 2013-11-25 | 2014-02-26 | 广东电网公司电力科学研究院 | Rapid water feeding stabilization control method based on boiler water circulation online monitoring system |
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