CN105020693A - Intelligent direct current furnace water supply separator temperature control method based on UCPS - Google Patents
Intelligent direct current furnace water supply separator temperature control method based on UCPS Download PDFInfo
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- CN105020693A CN105020693A CN201410158053.6A CN201410158053A CN105020693A CN 105020693 A CN105020693 A CN 105020693A CN 201410158053 A CN201410158053 A CN 201410158053A CN 105020693 A CN105020693 A CN 105020693A
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- load
- temperature
- feedwater
- input signal
- pid controller
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Abstract
The invention relates to an intelligent direct current furnace water supply separator temperature control method based on UCPS. The method includes the following steps that firstly, when a power grid is stable, an input signal E3 of a PID controller equals to T0-T, wherein T is separator temperature and To is a fixed temperature value; secondly, when the load of the power grid is added, a load adding model is adopted for controlling water supply; thirdly, when the load of the power grid is reduced, a load reducing model is adopted for controlling water supply. Compared with the prior art, the method has the beneficial effects that different water supply tasks are achieved and the good coordinated purpose is achieved.
Description
Technical field
The present invention relates to a kind of Once-through Boiler water supply control method, especially relate to a kind of Once-through Boiler based on UCPS intellectuality feedwater separator temperature control method.
Background technology
Along with the great-leap-forward development of domestic electrical equipment manufacture, 600MW and above grade supercritical unit have become main force's unit of electrical network, carry main peak regulation-frequency modulation task.How to ensure the load adjustment ability that unit is good, the cost that can reduce again peak load regulation-frequency modulation assistant service becomes urgent problem instantly.
Drum boiler feedwater only affects steam water-level, can not affect generated output, vapour pressure and steam temperature.And the boiler capacity of supercritical unit (Once-through Boiler) synchronously changes with confluent, so feedwater can directly affect generated output, vapour pressure and steam temperature.Visible supercritical unit is more complicated multi input, a multiple output system, owing to being forced circulation and without fixed limit between heated section, having a large amount of coupling phenomenons between each parameter; After the direct current cooker of supercritical parameter participates in peak regulation, thermodynamic property change more greatly, and delayed, time that its dynamic characteristic shows become and non-linear just stronger; Simultaneously because supercritical once-through boiler energy storage capability is relatively less, the contradiction that generation load controls to control with boiler parameter is just more outstanding.
Feedwater energy Rapid Variable Design unit generation power, steam temperature is also fast more than fuel to the response of feedwater simultaneously, especially has larger powder process to postpone medium-speed milling pulverization system.Feedwater increases, and load increases, and steam temperature declines, and the spatial load forecasting of visible once-through boiler unit and control of steam temperature are contradictory, regulate varying duty by feedwater, varying duty performance is good, but Temperature Deviation is larger, otherwise feedwater regulates steam temperature, then steam temperature change is less, but varying duty poor performance.
The coordinated control system being mainly applicable to drum boiler unit still continued to use by current supercritical unit, is difficult to meet supercritical unit service requirement, needs to have studied a kind of novel intelligent UCPS coordinated control system for supercritical unit for this reason.
Summary of the invention
Object of the present invention is exactly provide a kind of Once-through Boiler based on UCPS intellectuality feedwater separator temperature control method to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
Based on an Once-through Boiler intellectuality feedwater separator temperature control method of UCPS, it is characterized in that, comprise the following steps:
1) when the stabilization of power grids, the input signal E3=T of PID controller
0-T, wherein T is separator temperature, T
0for temperature definite value;
2) when electrical network application of load, adopt application of load model to control feedwater, wherein application of load model is as follows:
Temperature definite value during application of load: T
0i=MAX [(T
0-ρ), MIN (T
0, T)] (1)
The input signal of PID controller during application of load: E3=T
0i-T (2)
Wherein T
0ifor temperature definite value during application of load, ρ is the temperature deviation allowed;
3) when electrical network load shedding, adopt load shedding model to control feedwater, wherein load shedding model is as follows:
Temperature definite value during load shedding: T
0d=MIN [(T
0+ ρ), MAX (T
0, T)] (3)
The input signal of PID controller during load shedding: E3=T
0d-T (4)
Wherein T
0dfor temperature definite value during load shedding.
When electrical network application of load:
1) for energy multicomputer, T
0i=T
0, the input signal E3=T of PID controller
0-T;
2) low for energy but the unit do not transfinited, T
0i=T, the input signal E3=0 of PID controller;
3) low for energy and the unit transfinited, T
0i=T
0-ρ, the input signal E3=T of PID controller
0-ρ-T.
When electrical network load shedding:
1) for little energy unit, T
0d=T
0, the input signal E3=T of PID controller
0-T;
2) high for energy but the unit do not transfinited, T
0d=T, the input signal E3=0 of PID controller;
3) high for energy and the unit transfinited, T
0d=T
0+ ρ, the input signal E3=T of PID controller
0+ ρ-T.
Compared with prior art, the present invention has the following advantages:
By changing PID input deviation E3, achieving the control task that feedwater is different, reaching and coordinate target preferably.During varying duty, suitably abandon the control of steam temperature, assist control of steam turbine governing valve power, unit is had and continues varying duty performance preferably, after completing varying duty, feedwater is smoothly transitted into control steam temperature.
Accompanying drawing explanation
Fig. 1 is control logic figure of the present invention;
Fig. 2 is the control logic figure of embody rule of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, the Once-through Boiler intellectuality feedwater separator temperature control method that the present invention is based on UCPS, mainly through changing PID input deviation E3, realizes the control task that feedwater is different, reaches and coordinate target preferably.The input E3 logic of the controller of separator temperature during varying duty, as adopted separator enthalpy to control, as long as change into corresponding enthalpy separator temperature.
" application of load state 2 ", " load shedding state 2 " refer to and return to normal control of steam temperature to feedwater from the loads that adds deduct.
When there being varying duty to require, by the Trigger Function of varying duty state, making control system switch to the load condition that adds deduct, selecting separator temperature definite value (T when adding deduct load by handoff functionality block " T "
0ior T
0d), and whole calculating of steam temperature definite value and E3 are realized by height selection function " > ", " < " and other calculation functions.
Desuperheating water is for regulating corresponding vapor (steam) temperature, and it is similar to feedwater with vapour pressure impact on power, just more hurry up.The control system of intelligent UCPS desuperheating water can refer to feedwater and performs.
In the specific implementation should in conjunction with DCS and existing control logic, if any the PID of definite value SP and regulated variable PV, as long as revise its definite value SP.
Symbol description:
T is separator temperature, T
0for temperature definite value; T
0ifor temperature definite value during application of load; T
0dfor temperature definite value during load shedding, ρ is the temperature deviation allowed.
During the stabilization of power grids give water management
When stablizing, drawn by Fig. 1: E3=T
0-T.Now feedwater regulates separator temperature (or specific enthalpy), and desuperheating water regulates corresponding vapor (steam) temperature.Feedwater is followed by dynamic compensation when BM changes, and steam temperature is remained unchanged, realizes the decoupling zero of steam temperature to BM, the control of feedwater, desuperheating water should make Temperature Deviation reduce as far as possible.Be conducive to stable, the economical operation of unit.Control overflow is reached to water management.
Electrical network have increase power requirement time give water management
When electrical network application of load, adopt application of load model to control feedwater, wherein application of load model is as follows:
Temperature definite value during application of load: T
0i=MAX [(T
0-ρ), MN (T
0, T)] (1)
The input signal of PID controller during application of load: E3=T
0i-T (2)
Wherein T
0ifor temperature definite value during application of load, ρ is the temperature deviation allowed;
1) the feedwater control analysis of energy unit on the high side
As on the high side in unit energy, steam temperature is higher, T
0i=T
0, PID is for regulating separator temperature, and now desuperheating water also participates in temperature adjustment, and feedwater and desuperheating water increase because steam temperature is higher, and vapour pressure and power rise thereupon, and vapour pressure rises and makes pitch open greatly, accelerates power and rises.
No matter the unit that visible energy is on the high side, be that vapour pressure is higher but steam temperature is higher, and the performance of its application of load all can be better than required value.Although the power of the assembling unit does not have pitch so fast to feedwater and desuperheating water response, its impact or very important.
2) the feedwater control analysis of the energy unit that do not transfinite on the low side
Due to application of load process, feedwater increases in advance, and steam temperature generally can lower than temperature definite value, as on the low side in separator temperature in permissible value, is obtained: T by formula 1
0i=T, PID3 are input as 0, there will not be because steam temperature declines and reduce feedwater flow, making power of the assembling unit decline situation, and now feedwater is mainly used in the auxiliary adjustment power of the assembling unit.Now desuperheating water can limit impact on power and vapour pressure by the fall off rate of output limiting command.Unit is had and continues application of load performance preferably.
3) the feedwater control analysis of the energy unit that transfinites on the low side
If energy is on the low side, to show as temperature too low, namely exceedes permissible value, as separator is then obtained by formula 1: T
0i=T
0-ρ, now feedwater recovers to regulate separator temperature, and same desuperheating water also returns to normal steam temperature and regulates, and cancels the rate limit of instruction, prevents steam temperature too low, and ensure unit safety, varying duty performance can decline to some extent.
Electrical network have when subtracting power requirement give water management
When electrical network load shedding, adopt load shedding model to control feedwater, wherein load shedding model is as follows:
Temperature definite value during load shedding: T
0d-MIN [(T
0+ ρ), MAX (T
0, T)] (3)
The input signal of PID controller during load shedding: E3=T
0d-T (4)
Wherein T
0dfor temperature definite value during load shedding.
The control analysis of unit energy deviation is similar, no longer describes here.
Steam temperature tolerance ρ embodies the degree that unit allows to utilize accumulation of heat, and ρ is larger, and the accumulation of heat allowing to utilize is more, and the performance of peak load regulation frequency modulation is better, but Steam Temperature for Boiler change greatly, 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, in time the energy of balance electrical network.During non-larger varying duty, δ=δ 1, can arrange less.
Claims (3)
1., based on an Once-through Boiler intellectuality feedwater separator temperature control method of UCPS, it is characterized in that, comprise the following steps:
1) when the stabilization of power grids, the input signal E3=T of PID controller
0-T, wherein T is separator temperature, T
0for temperature definite value;
2) when electrical network application of load, adopt application of load model to control feedwater, wherein application of load model is as follows:
Temperature definite value during application of load: T
0i=MAX [(T
0-ρ), MIN (T
0, T)] (1)
The input signal of PID controller during application of load: E3=T
0i-T (2)
Wherein T
0ifor temperature definite value during application of load, ρ is the temperature deviation allowed;
3) when electrical network load shedding, adopt load shedding model to control feedwater, wherein load shedding model is as follows:
Temperature definite value during load shedding: T
0d=MIN [(T
0+ ρ), MAX (T
0, T)] (3)
The input signal of PID controller during load shedding: E3=T
0d-T (4)
Wherein T
0dfor temperature definite value during load shedding.
2. a kind of intellectuality of the Once-through Boiler based on UCPS feedwater separator temperature control method according to claim 1, is characterized in that, when electrical network application of load:
1) for energy multicomputer, T
0i=T
0, the input signal E3=T of PID controller
0-T;
2) low for energy but the unit do not transfinited, T
0i=T, the input signal E3=0 of PID controller;
3) low for energy and the unit transfinited, T
0i=T
0-ρ, the input signal E3=T of PID controller
0-ρ-T.
3. a kind of intellectuality of the Once-through Boiler based on UCPS feedwater separator temperature control method according to claim 1, is characterized in that, when electrical network load shedding:
1) for little energy unit, T
0d=T
0, the input signal E3=T of PID controller
0-T;
2) high for energy but the unit do not transfinited, T
0d=T, the input signal E3=0 of PID controller;
3) high for energy and the unit transfinited, T
0d=T
0+ ρ, the input signal E3=T of PID controller
0+ ρ-T.
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|---|---|---|---|
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|---|---|---|---|
| CN201410158053.6A CN105020693B (en) | 2014-04-18 | 2014-04-18 | Once-through Boiler intellectuality feedwater separator temperature control method based on UCPS |
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| CN105020693B CN105020693B (en) | 2017-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896569A (en) * | 2016-04-12 | 2016-08-24 | 国网上海市电力公司 | Supercritical unit CCS side primary frequency modulation method |
Citations (5)
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|---|---|---|---|---|
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896569A (en) * | 2016-04-12 | 2016-08-24 | 国网上海市电力公司 | Supercritical unit CCS side primary frequency modulation method |
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