CN102707620A - Backpressure control system of large air-cooler unit - Google Patents
Backpressure control system of large air-cooler unit Download PDFInfo
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- CN102707620A CN102707620A CN2012101813467A CN201210181346A CN102707620A CN 102707620 A CN102707620 A CN 102707620A CN 2012101813467 A CN2012101813467 A CN 2012101813467A CN 201210181346 A CN201210181346 A CN 201210181346A CN 102707620 A CN102707620 A CN 102707620A
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Abstract
The invention discloses a background control system of a large air-cooler unit, belonging to an automatic control system of a coal-fired power plant. The backpressure control system comprises a PID (Process Identifier), a backpressure automatic setting module, a feedforward signal, a control parameter variable gain module and a step-switching optimization module; a real-time online optimization logic is set up by dispersing a function module, an integrator module, a selection module, an add and subtract module, a division module, a multiply module and a pulse module in the control system, and an independently automatic control system capable of being tracked dynamically and controlled stably; the backpressure control system solves the technical problems that the backpressure control system of the large air-cooler unit has large overshoot and is difficult to realize automation in the whole course, and can be widely applied to the backpressure control of a steam turbine of the large air-cooler unit.
Description
Technical field
The present invention relates to a kind of automatic control system, especially a kind of back pressure closed loop automatic control system of large-scale air cooling unit.
Background technology
Air-cooled Unit back pressure control system mainly is that the measured value through back pressure calculates the needed cooling air delivery of condensation steam turbine exhaust steam; Poor according to back pressure measured value and setting value; In conjunction with blower fan step preface table; Continuously blower fan platform number, fan speed and steam isolating position are adjusted, finally controlled the steam turbine back pressure operation in the scope of safety and economy.
Basically all there is following problem in existing large-scale air cooling unit back pressure control system: (1) along with the variation of environment temperature, unit load, the operations staff has to manually increase and decrease the automatic setting value of back pressure, to satisfy the needs of unit operation.(2) winter, adverse current blower fan reduction of speed program can produce a regular disturbance to back pressure control, and this disturbance is lower in duty ratio, and is under the few operating mode of the air cooling blower fan of operation, especially obvious.(3) after the air cooling step, preface was switched, the blower fan quantity of operation changed, and back pressure control pid parameter can not be inconsistent with actual condition, causes control loop adjusting function variation.(4) it is too short interval time that air cooling step preface is switched setting, after control loop control characteristic variation, can cause going on foot preface and switch back and forth, strengthens the interference to control loop.The existence of these problems causes the control performance of turbine back pressure to descend, even the requirement that does not reach controlling index, has directly had influence on the safety and economic operation of unit.
Summary of the invention
The object of the present invention is to provide a kind of back pressure control system of large-scale air cooling unit, this system can overcome above shortcoming, realizes the whole-process automatic control of Air-cooled Unit.
Technical scheme of the present invention is: a kind of large-scale air cooling unit back pressure control system, and it is characterized in that: said control system comprises: pid control circuit, back pressure automatic setting module, feed-forward signal, controlled variable variable-gain module and cut the step optimal module; Wherein: pid control circuit is the goal-setting value with the turbine back pressure; The back pressure automatic setting module is considered the not enough and preventing freeze in winter performance of the summer capacity of air cooling island tube bank; With reference to the steam turbine plant operations specification, according to the unit practical operation situation, environment temperature, unit load and back pressure relation function have been designed.Unit load and environment temperature are high more, and the turbine back pressure setting value is high more.Back pressure control is changed into the intelligence control system of automatic setting optimal economic back pressure set value by the simple control system of conventional manual setting.On the PID module, use a feed-forward signal in case the antifreeze influence to back pressure control of non-return flow fan reduction of speed, feed-forward signal is a reverse step signal, and snap time is determined by adverse current blower fan reduction of speed program.Step signal is delivered to the back pressure control system as feed-forward signal after speed limit piece speed limit, balance out the influence that the adverse current reduction of speed brings to system.
In order to obtain better regulation quality; In control system, use a controlled variable variable-gain module, when the step preface increased or reduces, the blower fan platform number of operation changed; The open-loop gain of system is corresponding, and variation has taken place; Through this module back pressure control system closed loop proportional coefficient is adjusted accordingly, changed, guarantee the regulation quality of control system to adapt to the controlled device number.
Cutting the step optimal module is the system oscillation in order to have prevented that the continuous switching of step preface from causing; Avoid moving blower fan and adjust surplus in addition with regard to unnecessary start and stop blower fan, cut increase condition in the step program at traditional air cooling: operation blower fan frequency reaches the upper limit and could upwards cut the step; Operation blower fan frequency reaches lower limit and could go on foot to incision.
The invention has the advantages that: constitute the automatic control system that control was followed the tracks of and stablized to an independent dynamic; It is big to have solved the overshoot of large-scale air cooling unit back pressure control system; Be difficult to realize the technical matters of whole-process automatic, can be widely used in the turbine back pressure control of large-scale air cooling unit.
Description of drawings
Fig. 1 is the back pressure control system schematic diagram of a kind of large-scale air cooling unit of the present invention.
Embodiment
Below in conjunction with specific embodiment the present invention is done further description.
The present invention adopts following new approaches
(1) increases optimal economic back pressure automatic setting loop
Consider the not enough and preventing freeze in winter performance of summer capacity of air cooling island tube bank,, designed environment temperature, unit load and back pressure relation function with reference to the steam turbine plant operations specification, according to the unit practical operation situation.Back pressure control is changed into the intelligence control system of automatic setting optimal economic back pressure set value by the simple control system of former manual setting.
(2) increase anti-interference loop
In order to guarantee the stable of unit and back pressure control, prevent the antifreeze influence of adverse current blower fan reduction of speed to back pressure control, in the back pressure control loop, increase a reverse step feed-forward signal, snap time is by the decision of adverse current blower fan reduction of speed control program, and is as shown in fig. 1.Step signal is delivered to the back pressure control loop as feed-forward signal after speed limit piece speed limit, balance out the influence that the adverse current reduction of speed brings to system.
(3) back pressure controlled variable self-adaptation
When the step preface increased or reduces, the blower fan platform number of operation changed, and the open-loop gain of system is corresponding, and variation has taken place; If the step preface changes, the blower fan platform number of paired running changes, and open-loop gain changes; In order to obtain better regulation quality; After the step, preface changed, back pressure control loop closed loop proportional coefficient is adjusted accordingly, changed to adapt to the controlled device number, as shown in fig. 1.
(4) cut the step logic optimization
The tradition air cooling is cut in the step logic, and the trigger condition that the step preface increases (rising the step) is actual back pressure (BP
Survey) surpass and set back pressure (BP
S) 1.4 times; Perhaps work as BP
SurveyAt BP
S1.1 and 1.4 times between the time, with BP
SurveyWith 1.1 times of BP
SDifference to time integral, integrated value reaches setting value, and back pressure is when being in rising edge.The trigger condition that the step preface reduces (falling the step) is BP
SurveyBe lower than BP
S0.6 doubly; Perhaps work as BP
SurveyAt BP
S0.6 and 0.9 times between the time, with 0.9 times of BP
SWith BP
SurveyDifference to time integral, integrated value reaches setting value, and back pressure is when being in negative edge.
Existing is BP with logic Modification
SurveyAt BP
S1.1 and 1.4 times between rise the step condition and increase operation blower fan frequency and reach the upper limit; BP
SurveyAt BP
S0.6 and 0.9 times between the step condition of falling increase operation blower fan frequency and reach lower limit.
Work as BP
SurveyAt BP
S0.9 and 1.1 times between or when going on foot preface and changing, integrated value need continue zero clearing, promptly keeps current step preface.The unit back pressure is mainly adjusted by the blower fan frequency shift of operation.
After each step preface changes, 1 minute dead band is arranged, go on foot preface in the period at this section and remain unchanged.
This invention has strengthened the antijamming capability of back pressure control system, has improved control accuracy.This control system has powerful adaptive faculty to the disturbance operating mode, under nominal situation, back pressure is had perfect regulating effect, and response speed is fast, and automatization level is high, has greatly reduced labour intensity.
Claims (1)
1. large-scale air cooling unit back pressure control system, it is characterized in that: said control system comprises: pid control circuit, back pressure automatic setting module, feed-forward signal, controlled variable variable-gain module and cut the step optimal module; Wherein: pid control circuit is the goal-setting value with the turbine back pressure; The back pressure automatic setting module is considered the not enough and preventing freeze in winter performance of the summer capacity of air cooling island tube bank; With reference to the steam turbine plant operations specification, according to the unit practical operation situation, environment temperature, unit load and back pressure relation function have been designed; Unit load and environment temperature are high more, and the turbine back pressure setting value is high more; Back pressure control is changed into the intelligence control system of automatic setting optimal economic back pressure set value by the simple control system of conventional manual setting; On the PID module, use a feed-forward signal in case the antifreeze influence to back pressure control of non-return flow fan reduction of speed, feed-forward signal is a reverse step signal, and snap time is determined by adverse current blower fan reduction of speed program; Step signal is delivered to the back pressure control system as feed-forward signal after speed limit piece speed limit, balance out the influence that the adverse current reduction of speed brings to system; In control system, use a controlled variable variable-gain module; When the step preface increases or reduces; The blower fan platform number of operation changes, and the open-loop gain of system is corresponding, and variation has taken place, and through this module back pressure control system closed loop proportional coefficient is adjusted accordingly; Change to adapt to the controlled device number, guarantee the regulation quality of control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101813467A CN102707620A (en) | 2012-06-05 | 2012-06-05 | Backpressure control system of large air-cooler unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101813467A CN102707620A (en) | 2012-06-05 | 2012-06-05 | Backpressure control system of large air-cooler unit |
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| CN2012101813467A Pending CN102707620A (en) | 2012-06-05 | 2012-06-05 | Backpressure control system of large air-cooler unit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889413A (en) * | 2012-10-21 | 2013-01-23 | 上海恳工自动化设备有限公司 | Intelligent electric control system and method of redundancy actuator for valve |
| CN106247815A (en) * | 2016-07-19 | 2016-12-21 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit |
| CN107062936A (en) * | 2017-04-01 | 2017-08-18 | 廖原 | The control method of direct air cooling system |
| CN107780982A (en) * | 2017-12-07 | 2018-03-09 | 华电郑州机械设计研究院有限公司 | A kind of online indirect air cooling high back pressure thermal power plant unit backpressure control system and method |
| CN109780884A (en) * | 2018-12-29 | 2019-05-21 | 中国神华能源股份有限公司 | Method for building up, control method, system and the unit of unit back pressuce model |
| CN109779891A (en) * | 2018-12-28 | 2019-05-21 | 河北涿州京源热电有限责任公司 | The optimization method of Turbo-generator Set back pressure and quantity of circulating water |
| CN112947052A (en) * | 2021-01-29 | 2021-06-11 | 华能甘肃能源开发有限公司 | Control method and system for backpressure of direct air cooling unit |
| CN113189862A (en) * | 2021-04-29 | 2021-07-30 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Quality evaluation method for PID control loop of thermal power plant |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889413A (en) * | 2012-10-21 | 2013-01-23 | 上海恳工自动化设备有限公司 | Intelligent electric control system and method of redundancy actuator for valve |
| CN106247815A (en) * | 2016-07-19 | 2016-12-21 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of control method of the in line big machine air cooling system of the little machine of supercritical thermal power unit |
| CN106247815B (en) * | 2016-07-19 | 2018-04-20 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of control method of the in line big machine air cooling system of the small machine of supercritical thermal power unit |
| CN107062936B (en) * | 2017-04-01 | 2019-07-19 | 廖原 | The control method of direct air cooling system |
| CN107062936A (en) * | 2017-04-01 | 2017-08-18 | 廖原 | The control method of direct air cooling system |
| CN107780982A (en) * | 2017-12-07 | 2018-03-09 | 华电郑州机械设计研究院有限公司 | A kind of online indirect air cooling high back pressure thermal power plant unit backpressure control system and method |
| CN107780982B (en) * | 2017-12-07 | 2024-05-14 | 华电郑州机械设计研究院有限公司 | Back pressure control system and method for online indirect air cooling high back pressure heat supply unit |
| CN109779891A (en) * | 2018-12-28 | 2019-05-21 | 河北涿州京源热电有限责任公司 | The optimization method of Turbo-generator Set back pressure and quantity of circulating water |
| CN109779891B (en) * | 2018-12-28 | 2020-04-24 | 河北涿州京源热电有限责任公司 | Method for optimizing backpressure and circulating water quantity of steam turbine generator unit |
| CN109780884A (en) * | 2018-12-29 | 2019-05-21 | 中国神华能源股份有限公司 | Method for building up, control method, system and the unit of unit back pressuce model |
| CN112947052A (en) * | 2021-01-29 | 2021-06-11 | 华能甘肃能源开发有限公司 | Control method and system for backpressure of direct air cooling unit |
| CN112947052B (en) * | 2021-01-29 | 2022-09-09 | 华能甘肃能源开发有限公司 | Control method and system for backpressure of direct air cooling unit |
| CN113189862A (en) * | 2021-04-29 | 2021-07-30 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Quality evaluation method for PID control loop of thermal power plant |
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Application publication date: 20121003 |