CN102607053A - Intermittent control method for eliminating static deviation of main steam pressure of fossil fuel fired power unit - Google Patents

Intermittent control method for eliminating static deviation of main steam pressure of fossil fuel fired power unit Download PDF

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CN102607053A
CN102607053A CN2012100490158A CN201210049015A CN102607053A CN 102607053 A CN102607053 A CN 102607053A CN 2012100490158 A CN2012100490158 A CN 2012100490158A CN 201210049015 A CN201210049015 A CN 201210049015A CN 102607053 A CN102607053 A CN 102607053A
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vapour pressure
main vapour
boiler
static deviation
instruction
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CN102607053B (en
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陈雨亭
吕剑虹
崔晓波
秦文炜
沈炯
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Southeast University
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Abstract

The invention discloses an intermittent control method for eliminating static deviation of main steam pressure of a fossil fuel fired power unit, which includes the steps: monitoring the static deviation of the main steam pressure of the fossil fuel fired power unit in real time; and when the static deviation of the main steam pressure exceeds a specified value, making use of the step output characteristic of a derivative control module to adjust fuel quantity of a boiler based on an original boiler fuel quantity instruction by means of the intermittent rapid superposition of fuel quantity instruction offset corresponding to the static deviation of the main steam pressure, thereby eliminating the static deviation of the main steam pressure of the unit. By the method, the static deviation of the main steam pressure of the fossil power unit can be monitored in real time, and when the static deviation of the main steam pressure exceeds the specified value, the fuel quantity of the boiler can be adjusted timely by means of the intermittent rapid superposition of fuel quantity instruction offset corresponding to the static deviation of the main steam pressure, so that the static deviation of the main steam pressure of the unit can be eliminated quickly, and the precision of controlling the main steam pressure of the unit is improved effectively.

Description

A kind of intermittent control method of eliminating fired power generating unit main vapour pressure static deviation
Technical field
The present invention relates to a kind of intermittent control method of quick elimination fired power generating unit main vapour pressure static deviation; Particularly a kind of step output characteristics of utilizing the differential control module; On the basis of former boiler oil amount instruction,, in time adjust the fuel quantity of boiler through intermittent quick stack and the corresponding fuel quantity instruction of vapour pressure static deviation biasing; Thereby eliminate the advanced control method of unit main vapour pressure static deviation fast, belong to thermal power engineering and automation field.
Background technology
The load control system of boiler is that thermal power plant regulates load and stablizes one of most important control system of unit operation, and it mainly comprises boiler master loop and fuel control loop.In traditional boiler load control scheme (as shown in Figure 1), the instruction that each layer produced is:
Ground floor is the boiler master layer, calculates the fuel quantity instruction BM of boiler:
BM＝PD(N 0)+PID[k 1(P 0-P T)]
In the formula, N 0Power instruction for unit; P 0Be the main vapour pressure definite value; P TBe main vapour pressure; k 1Be selectable proportionality coefficient; PD, PID are respectively proportion differential and proportional integral derivative controller.
The second layer is the fuel key-course, calculates the mean speed instruction CFB of feeder:
CFB＝k 3*BM+PI[k 2(BM-FU)]
In the formula, BM is the instruction of boiler oil amount; FU is that the total coal amount of boiler is through the filtered output valve of one order inertia; k 2, k 3Be selectable proportionality coefficient; PI is a proportional and integral controller.
The mean speed instruction CFB of adjustment coal feeder of boiler just can realize the adjustment of boiler oil amount.
In traditional boiler load control scheme, the static deviation (P of main vapour pressure 0-P T) mainly rely on integral action I in the PID adjuster to eliminate.Because the boiler coal feeding amount is controlled process (about about 120 seconds of the pure hysteresis of a big inertia, large time delay to the influence of main vapour pressure; Between inertial time about about 1000 seconds); Therefore control the stability of system in order to ensure boiler load; Integral action in the PID adjuster can only obtain very little (to big Inertial Processing, big integral action can cause the instability of control system), and often reach more than 400 seconds the time of integration.On the other hand, the static deviation (P of main vapour pressure 0-P T) often have only about (0.1-0.3) Mpa; The input deviation of PID adjuster is very little; Very little integral action often makes the poor ability of the boiler load control elimination vapour pressure static difference that system had, and in the most of the time of thermal power unit operation, always has the vapour pressure static deviation that is difficult to eliminate; The 300MW unit of particularly direct-firing Subcritical Units such as domestic a large amount of operations exists the situation of vapour pressure static difference particularly evident all the time.At present, also do not meet and adopt other effective ways to eliminate the vapour pressure static difference with the method that improves its control accuracy and the report of control scheme.
Summary of the invention
Technical problem: to the present situation of boiler load control system; For the static deviation of effectively eliminating the unit main vapour pressure to improve its control accuracy; The present invention is on the basis of former boiler oil amount instruction; Propose a kind of intermittent control method of eliminating fired power generating unit main vapour pressure static deviation,, eliminate unit main vapour pressure static deviation fast through intermittent quick stack and the corresponding fuel quantity instruction of vapour pressure static deviation biasing.
Technical scheme: for solving the problems of the technologies described above; The invention provides a kind of intermittent control method of eliminating fired power generating unit main vapour pressure static deviation; This method comprises the steps: to monitor in real time the static deviation of fired power generating unit main vapour pressure, when the static deviation overshoot value of main vapour pressure, utilizes the step output characteristics of differential control module; On the basis of former boiler oil amount instruction; Through intermittent quick stack and the corresponding fuel quantity instruction of main vapour pressure static deviation biasing, the fuel quantity of adjustment boiler, thereby the static deviation of elimination unit main vapour pressure.
Said adjustment boiler oil amount, its object are boiler master layer and fuel key-course:
Adjustment boiler master layer will be according to the power instruction N of fired power generating unit 0And main vapour pressure deviation (P 0-P T) obtain the fuel quantity instruction BM of boiler:
BM＝PD(N 0)+PID[k 1(P 0-P T)]+BMT
In the formula, N 0Power instruction for unit; P 0Be the main vapour pressure definite value; P TBe main vapour pressure; k 1Be selectable proportionality coefficient; PD, PID are respectively proportion differential and proportional integral derivative controller; BMT is the intermittence adjustment biasing of fuel quantity instruction, and its adjusting range is relevant with the static deviation size of main vapour pressure;
The intermittence adjustment biasing BMT of fuel quantity instruction adopts following method to confirm:
Steps A. confirm the Status Flag " STAT " that fuel quantity is intermittently adjusted;
If steps A 1. is main vapour pressure definite value P 0, main vapour pressure P TThe absolute value of rate of change respectively less than LL1 and LL2, vapour pressure deviation (P 0-P T) greater than setting HL, and this state can hold time DT1 more than second, and then there is the static deviation of main vapour pressure in illustrative system, needs the adjustment fuel quantity, and Status Flag " STAT " is answered set; Describe with following production rule:
IF{(abs(LED 1(P 0))≤LL1)AND(abs(LED 2(P T))≤LL2)AND
(abs (P 0-P T)>=HL) can retention time DT1 second then " STAT "=1
In the formula, LL1, LL2 is respectively predefined different limit value with HL; Abs is an ABS function; AND is the logical module; P 0Be the main vapour pressure definite value; P TBe main vapour pressure; LED 1, LED 2Be respectively the first differential module and the second differential module of different parameters, its transfer function is respectively: LED 1 ( s ) = K D 1 T D 1 s 1 + T D 1 s , LED 2 ( s ) = K D 2 T D 2 s 1 + T D 2 s ; K D1It is the proportional gain of the first differential module; T D1It is the derivative time of the first differential module; K D2It is the proportional gain of the second differential module; T D2It is the derivative time of the second differential module; S is a Laplace operator;
Steps A 2. is if the retention time of sign " STAT "=1 surpasses DT2 second, and then " STAT " automatically resets, i.e. " STAT "=0;
The Status Flag " STAT " that step B. based on fuel amount is intermittently adjusted confirms that the intermittence of fuel quantity instruction is adjusted biasing BMT;
In the formula, P 0Be the main vapour pressure definite value; P TBe main vapour pressure; A 1, A 2It is the constant of two settings; F (x) is predefined multiple spot function; LED 3Be the 3rd differential module, its transfer function is:
Figure BDA0000139370190000034
LED 3(A 2-A 1) be with (A 2-A 1) be the differential output of step input; K D3It is the proportional gain of the 3rd differential module; T D3It is the derivative time of the 3rd differential module; S is a Laplace operator;
The fuel key-course, will instruct BM and the actual total coal amount FU of boiler to calculate the mean speed instruction CFB of feeder based on the boiler oil amount:
CFB＝k 3*BM+PI[k 2(BM-FU)]
In the formula, BM is the instruction of boiler oil amount; FU is that the total coal amount of boiler is through the filtered output valve of one order inertia; k 2, k 3Be selectable proportionality coefficient; PI is a proportional and integral controller;
The mean speed instruction CFB of adjustment coal feeder of boiler realizes the adjustment of boiler oil amount.
Beneficial effect: the invention has the beneficial effects as follows: because through monitoring the static deviation of fired power generating unit main vapour pressure in real time; When vapour pressure static deviation overshoot value; Utilize the step output characteristics of differential control module; On the basis of former boiler oil amount instruction, the corresponding fuel quantity instruction of intermittent quick stack and vapour pressure static deviation is setovered, and in time adjusts the fuel quantity of boiler; Thereby can eliminate the static deviation of unit main vapour pressure fast, effectively improve the control accuracy of unit main vapour pressure.
Description of drawings
The flow chart of the traditional scheme of Fig. 1 boiler load control.Among the figure, k1, k2, k3 are the ratio module; PD is the proportion differential module; PI is the proportional integral module; PID is the PID module; LAG is the inertia module.
The flow chart of Fig. 2 boiler load control of the present invention scheme.Among the figure, k1, k2, k3 are the ratio module; PD is the proportion differential module; PI is the proportional integral module; PID is the PID module; LAG is the inertia module; LED is actual differential module; F (x) is a polygronal function; A is for setting coefficient; ABS is an ABS function; H/ is high value monitor module; / L is the low value monitor module; MUL is a multiplier module; T is a handover module; AND is the logical AND module; TD is the charged module of time-delay; RS is the rest-set flip-flop module.
The specific embodiment
The present invention will be described below with reference to accompanying drawings.
The intermittent control method of a kind of quick elimination fired power generating unit main vapour pressure static deviation of the present invention is to realize through following technical scheme:
Monitor the static deviation of fired power generating unit main vapour pressure in real time; When vapour pressure static deviation overshoot value; Utilize the step output characteristics of differential control module, on the basis of former boiler oil amount instruction, through intermittent quick stack and the corresponding fuel quantity instruction of vapour pressure static deviation biasing; In time adjust the fuel quantity of boiler, thereby can eliminate the static deviation of unit main vapour pressure fast.
The fuel adjustment of boiler is divided into two layers up and down, is boiler master layer and fuel key-course:
Ground floor is the boiler master layer, will be according to the power instruction N of generating set 0And main vapour pressure deviation (P 0-P T) wait the fuel quantity instruction BM that calculates boiler:
BM＝PD(N 0)+PID[k 1(P 0-P T)]+BMT
In the formula, N 0Power instruction for unit; P 0Be the main vapour pressure definite value; P TBe main vapour pressure; k 1Be selectable proportionality coefficient; PD, PID are respectively proportion differential and proportional integral derivative controller; BMT is the intermittence adjustment biasing of fuel quantity instruction, and its adjusting range is relevant with the static difference size of main vapour pressure.
BMT adopts following method to confirm:
A. confirm the Status Flag " STAT " that fuel quantity is intermittently adjusted.
A1. if main vapour pressure definite value P 0, main vapour pressure P TThe absolute value of rate of change respectively less than LL1 and LL2, vapour pressure deviation (P 0-P T) greater than setting HL, and this state can hold time DT1 more than second, and then there is the static deviation of main vapour pressure in illustrative system, needs the adjustment fuel quantity, and Status Flag " STAT " is answered set.Available following production rule is described:
IF{(abs(LED 1(P 0))≤LL1)AND(abs(LED 2(P T))≤LL2)AND
(abs (P 0-P T)>=HL) can retention time DT1 second then " STAT "=1
In the formula, LL1, LL2 is respectively different limit values with HL; Abs is an absolute value block; AND is the logical module.LED 1, LED 2Be respectively the differential module of different parameters, its transfer function is respectively:
LED 1 ( s ) = K D 1 T D 1 s 1 + T D 1 s , LED 2 ( s ) = K D 2 T D 2 s 1 + T D 2 s .
A2. if the retention time of sign " STAT "=1 surpasses DT2 second, then " STAT " automatically resets, i.e. " STAT "=0
B. the Status Flag of intermittently adjusting based on fuel quantity " STAT " confirms that the intermittence of fuel quantity instruction is adjusted biasing BMT.
In the formula, P 0Be the main vapour pressure definite value; P TBe main vapour pressure; A 1, A 2It is the constant of two settings; F (x) is predefined multiple spot function; LED 3Be the differential module, its transfer function is:
Figure BDA0000139370190000054
LED 3(A 2-A 1) be with (A 2-A 1) be the differential output of step input.
The second layer is the fuel key-course, will instruct BM and the actual total coal amount FU of boiler to calculate the mean speed instruction CFB of feeder based on the boiler oil amount:
CFB＝k 3*BM+PI[k 2(BM-FU)]
In the formula, BM is the instruction of boiler oil amount; FU is that the total coal amount of boiler is through the filtered output valve of one order inertia; k 2, k 3Be selectable proportionality coefficient; PI is a proportional and integral controller.
The mean speed instruction CFB of adjustment coal feeder of boiler just can realize the adjustment to the boiler oil amount.
The intermittent control method of a kind of quick elimination unit main vapour pressure static deviation of present embodiment; Can monitor the static deviation of fired power generating unit main vapour pressure in real time; When vapour pressure static deviation overshoot value, utilize the step output characteristics of differential control module, on the basis of former boiler oil amount instruction; Through intermittent quick stack and the corresponding fuel quantity instruction of vapour pressure static deviation biasing; In time adjust the fuel quantity of boiler, thereby can eliminate the static deviation of unit main vapour pressure fast, effectively improve the control accuracy of unit main vapour pressure.The boiler load control scheme that present embodiment proposes is shown in accompanying drawing 2.
The fuel quantity instruction BM of boiler:
BM＝PD(N 0)+PID[k 1(P 0-P T)]+BMT
In the formula, N 0Power instruction for unit; P 0Be the main vapour pressure definite value; P TBe main vapour pressure; k 1Be selectable proportionality coefficient; PD, PID are respectively proportion differential and proportional integral derivative controller; BMT is the intermittence adjustment biasing of fuel quantity instruction, and its adjusting range is relevant with the static difference size of main vapour pressure.
BMT adopts following method to confirm:
A. confirm the Status Flag " STAT " that fuel quantity is intermittently adjusted.
A1. if main vapour pressure definite value P 0, main vapour pressure P TThe absolute value of rate of change respectively less than LL1 and LL2, vapour pressure deviation (P 0-P T) greater than setting HL, and this state can hold time DT1 more than second, and then there is the static deviation of main vapour pressure in illustrative system, needs the adjustment fuel quantity, and Status Flag " STAT " is answered set.Available following production rule is described:
IF{(abs(LED 1(P 0))≤LL1)AND(abs(LED 2(P T))≤LL2)AND
(abs (P 0-P T)>=HL) can retention time DT1 second then " STAT "=1
In the formula, LL1, LL2 is respectively different limit values with HL; Abs is an absolute value block; AND is the logical module.LED 1, LED 2Be respectively the differential module of different parameters, its transfer function is respectively:
LED 1 ( s ) = K D 1 T D 1 s 1 + T D 1 s , LED 2 ( s ) = K D 2 T D 2 s 1 + T D 2 s .
A2. if the retention time of sign " STAT "=1 surpasses DT2 second, then " STAT " automatically resets, i.e. " STAT "=0
B. the Status Flag of intermittently adjusting based on fuel quantity " STAT " confirms that the intermittence of fuel quantity instruction is adjusted biasing BMT.
Figure BDA0000139370190000063
In the formula, P 0Be the main vapour pressure definite value; P TBe main vapour pressure; A 1, A 2It is the constant of two settings; F (x) is predefined multiple spot function; LED 3Be the differential module, its transfer function is:
Figure BDA0000139370190000064
LED 3(A 2-A 1) be with (A 2-A 1) be the differential output of step input.
The mean speed instruction CFB of feeder:
CFB＝k 3*BM+PI[k 2(BM-FU)]
In the formula, BM is the instruction of boiler oil amount; FU is that the total coal amount of boiler is through the filtered output valve of one order inertia; k 2, k 3Be selectable proportionality coefficient; PI is a proportional and integral controller.
The mean speed instruction CFB of adjustment coal feeder of boiler just can realize the adjustment to the boiler oil amount.
The subcritical fired power generating unit of certain 300MW adopts the control scheme of this patent, and the relevant parameter of following formula is elected as:
The boiler master layer parameter:
PD ( s ) = 0.47 + 12.5 × 12 s 1 + 12 s , PID ( s ) = 1.3 + 1 530 s , k1＝4， LED 1 ( s ) = 20.0 × 10 s 1 + 10 s
Figure BDA0000139370190000074
LL 1＝LL 2＝0.2，HL＝0.1，A1＝0.0，A2＝1.0，A3＝0.0
DT1＝60Sec，DT2＝250Sec，
Figure BDA0000139370190000075
F (x): calculate through linear interpolation by following function point
x -1.0 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 1.0
F(x) -4.0 -4.0 -3.0 -2.0 0.0 2.0 3.0 4.0 4.0
Fuel key-course parameter:
k 2＝0.1，k 3＝1.0， PI ( s ) = 0.02 + 1 6.0 s ,
Figure 000008
The intermittent control method of quick elimination unit main vapour pressure static deviation of the present invention can directly realize that through configuration mode this control system is successful Application on certain 300MW of power plant Subcritical Units in all kinds of scattered control system DCS.Before adopting the present invention, all there is the static deviation between (0.1-0.3) Mpa in unit at main vapour pressure in most running time, and after adopting the present invention, the static deviation of main vapour pressure can be eliminated fast, has effectively improved the control accuracy of main vapour pressure.
The above is merely preferred embodiments of the present invention; Protection scope of the present invention is not exceeded with above-mentioned embodiment; As long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection domain of putting down in writing in claims.

Claims (2)

1. intermittent control method of eliminating fired power generating unit main vapour pressure static deviation; It is characterized in that: this method comprises the steps: to monitor in real time the static deviation of fired power generating unit main vapour pressure; When the static deviation overshoot value of main vapour pressure; Utilize the step output characteristics of differential control module, on the basis of former boiler oil amount instruction, through intermittent quick stack and the corresponding fuel quantity instruction of main vapour pressure static deviation biasing; The fuel quantity of adjustment boiler, thereby the static deviation of elimination unit main vapour pressure.
2. the intermittent control method of elimination fired power generating unit main vapour pressure static deviation according to claim 1 is characterized in that said adjustment boiler oil amount, and its object is boiler master layer and fuel key-course:
Adjustment boiler master layer will be according to the power instruction N of fired power generating unit 0And main vapour pressure deviation (P 0-P T) obtain the fuel quantity instruction BM of boiler:
BM＝PD(N 0)+PID[k 1(P 0-P T)]+BMT
In the formula, N 0Power instruction for unit; P 0Be the main vapour pressure definite value; P TBe main vapour pressure; k 1Be selectable proportionality coefficient; PD, PID are respectively proportion differential and proportional integral derivative controller; BMT is the intermittence adjustment biasing of fuel quantity instruction, and its adjusting range is relevant with the static deviation size of main vapour pressure;
The intermittence adjustment biasing BMT of fuel quantity instruction adopts following method to confirm:
Steps A. confirm the Status Flag " STAT " that fuel quantity is intermittently adjusted;
If steps A 1. is main vapour pressure definite value P 0, main vapour pressure P TThe absolute value of rate of change respectively less than LL1 and LL2, vapour pressure deviation (P 0-P T) greater than setting HL, and this state can hold time DT1 more than second, and then there is the static deviation of main vapour pressure in illustrative system, needs the adjustment fuel quantity, and Status Flag " STAT " is answered set; Describe with following production rule:
IF{(abs(LED 1(P 0))≤LL1)AND(abs(LED 2(P T))≤LL2)AND
(abs (P 0-P T)>=HL) can retention time DT1 second then " STAT "=1
In the formula, LL1, LL2 is respectively predefined different limit value with HL; Abs is an ABS function; AND is the logical module; P 0Be the main vapour pressure definite value; P TBe main vapour pressure; LED 1, LED 2Be respectively the first differential module and the second differential module of different parameters, its transfer function is respectively: LED 1 ( s ) = K D 1 T D 1 s 1 + T D 1 s , LED 2 ( s ) = K D 2 T D 2 s 1 + T D 2 s ; K D1It is the proportional gain of the first differential module; T D1It is the derivative time of the first differential module; K D2It is the proportional gain of the second differential module; T D2It is the derivative time of the second differential module; S is a Laplace operator;
Steps A 2. is if the retention time of sign " STAT "=1 surpasses DT2 second, and then " STAT " automatically resets, i.e. " STAT "=0;
The Status Flag " STAT " that step B. based on fuel amount is intermittently adjusted confirms that the intermittence of fuel quantity instruction is adjusted biasing BMT;
Figure FDA0000139370180000021
In the formula, P 0Be the main vapour pressure definite value; P TBe main vapour pressure; A 1, A 2It is the constant of two settings; F (x) is predefined multiple spot function; LED 3Be the 3rd differential module, its transfer function is:
Figure FDA0000139370180000022
LED 3(A 2-A 1) be with (A 2-A 1) be the differential output of step input; K D3It is the proportional gain of the 3rd differential module; T D3It is the derivative time of the 3rd differential module; S is a Laplace operator;
The fuel key-course, will instruct BM and the actual total coal amount FU of boiler to calculate the mean speed instruction CFB of feeder based on the boiler oil amount:
CFB＝k 3*BM+PI[k 2(BM-FU)]
In the formula, BM is the instruction of boiler oil amount; FU is that the total coal amount of boiler is through the filtered output valve of one order inertia; k 2, k 3Be selectable proportionality coefficient; PI is a proportional and integral controller;
The mean speed instruction CFB of adjustment coal feeder of boiler realizes the adjustment of boiler oil amount.
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CN103216826A (en) * 2013-04-02 2013-07-24 国家电网公司 Main steam pressure self-adaptive predictor of generator set of circulating fluidized bed boiler
CN103216826B (en) * 2013-04-02 2015-03-11 国家电网公司 Main steam pressure self-adaptive predictor of generator set of circulating fluidized bed boiler
CN104132367A (en) * 2014-07-30 2014-11-05 国家电网公司 Method for controlling amount of coal conveyed into furnace of thermal generator set on basis of virtual fuel quantity
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CN107589662B (en) * 2017-11-10 2023-04-28 中国大唐集团科学技术研究院有限公司西北分公司 Main steam pressure adjusting method and main steam pressure adjusting system
CN108227501A (en) * 2018-01-16 2018-06-29 云南电网有限责任公司电力科学研究院 A kind of compensation method of fired power generating unit spatial load forecasting static deviation
CN108227501B (en) * 2018-01-16 2020-09-22 云南电网有限责任公司电力科学研究院 Compensation method for load control static deviation of thermal power generating unit
CN112503567A (en) * 2020-11-24 2021-03-16 北方魏家峁煤电有限责任公司 Feedforward coefficient determining method and device for boiler master control instruction
CN112947049A (en) * 2021-01-28 2021-06-11 国网湖南省电力有限公司 Thermal power generating unit control method, system and medium for hysteresis characteristic object
CN112947049B (en) * 2021-01-28 2023-10-27 国网湖南省电力有限公司 Thermal power generating unit control method, system and medium for hysteresis characteristic object
CN113483317A (en) * 2021-07-14 2021-10-08 华电国际电力股份有限公司邹县发电厂 Main steam pressure control system with static deviation intelligent elimination

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