CN204741287U - Device of load regulation speed dynamic adjustment under coal -fired power unit AGC mode - Google Patents
Device of load regulation speed dynamic adjustment under coal -fired power unit AGC mode Download PDFInfo
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- CN204741287U CN204741287U CN201520241536.2U CN201520241536U CN204741287U CN 204741287 U CN204741287 U CN 204741287U CN 201520241536 U CN201520241536 U CN 201520241536U CN 204741287 U CN204741287 U CN 204741287U
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Abstract
The utility model discloses a device of load regulation speed dynamic adjustment under coal -fired power unit AGC mode, include: subtracter module DEV1, absolute value module ABS, function setting module F (x) be the series connection in proper order, subtracter module DEV2 and height amplitude judge module HLALM series connection, analog quantity generator A1, function setting module F (x) and height amplitude judge module HLALM's output inserts selector module AXSEL's input respectively. The utility model discloses beneficial effect: main air pressure through the dynamic adjustment of regulation speed, can effectively guarantee the unit adjustment of loading fast when stabilizing to reach the load command of control center requirement rapidly, realize the optimization of performance assessment criteria.
Description
Technical field
The utility model relates to fired power generating unit automatic generation control field, particularly relates to the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode.
Background technology
Along with the continuous increase of new-energy grid-connected, load growth and electrical network scale, and the increase of the increase of China's power industry installed capacity and electricity consumption side load peak-valley difference, in order to the safe and stable operation of electrical network, each Large-scale fire-electricity unit all requires to drop into AGC function, Large-scale fire-electricity unit is often in wide load section operation, scope generally in 50% ~ 100% rated load, and requires that unit possesses quick, accurate, stable load-responsive change demand.
AGC examination is mainly examined from regulations speed K1, degree of regulation K2, response time K3 tri-aspect.As Fig. 1 typical case AGC unit sets up an office shown in control procedure, this be in net certain unit once typical AGC unit to set up an office control procedure.In figure, P
min, ithat the adjustable lower limit of this unit is exerted oneself, P
max, ithat its adjustable upper limit is exerted oneself, P
niits rated output, P
diits start and stop mill critical point power.Whole process can describe like this: before the T0 moment, before the T1 moment, this stable operation of unit is going out near force value P1, the T0 moment, AGC control program issues to this unit the order that sets up an office that power is P2, unit starts to swell power, the adjustment dead band of P1 is reliably stepped out to the T1 moment, then arriving the T2 moment enters that to open mill interval, until the T3 moment, open honed journey to terminate, unit continues to swell power, adjustment dead zone range is entered to first time in T4 moment, then but small oscillations near P2, and stable operation is near P2, until the T5 moment, AGC control program sends the new order that sets up an office to this unit, performance number is P3, unit starts to fall the process of exerting oneself subsequently, the T6 moment reliably steps out and regulates dead band, the adjustment dead band of P3 is entered to the T7 moment, and stable operation is near it.
Fig. 2 is fired power generating unit conventional control units schematic diagram, and T is switch, carries out branch road switching; A is analog generator, can set analog quantity numerical value; ≮, ≯ for being not less than and being not more than determining device, receive the restriction of load lower limit from analog generator A2 and A3 and upper load limit respectively, be no more than set point then export with input identical; RTLMT is speed limiting device, and receive the restriction of load changing rate, can control the rate of change of input variable, its Load Regulation rate value sets in analog generator A1, keeps fixing, deliver to forward speed end PR and negative sense speed end NR respectively after setting.Unit is to drop into AGC, prerequisite is under unit is operated in coordination (CCS) mode, unit load instruction LDSP is now through the value after rate limit and load lower limit, ceiling restriction, and described regulations speed and load bound are set by power plant operating personnel.After drop into AGC under CCS mode, the switch before LDSP is switched to AGC branch road, and the value of LDSP is middle tune instruction; Otherwise be the instruction of plant operators's setting.
" power plant, region, North China be incorporated into the power networks management implementation detailed rules and regulations " regulation, the fired power generating unit of the drum boiler of general direct-fired system is 1.5% of the specified active power of unit; The fired power generating unit of general band bin storage type pulverizing system is 2% of the specified active power of unit.That is, the regulations speed A1 value in Fig. 2 should be set to 1.5%Pe or 2%Pe.But when unit runs under AGC mode, due to the difference of unit self character, and the signal lag that causes such as Internet Transmission and signal conversion and delaying, each unit load response time is different with responding ability, for reaching scheduling controlling appraisal standards, generally by unit regulations speed set a little more than basic demand value.The regulations speed of unit lifting load is after exceeding the basic demand value of scheduling controlling agencies dictate, though directly do not affect the performance index of examination, its relative motion cycle of unit can shorten speed faster, for AGC examination brings certain help.When running under AGC mode, unit is cooperation control pattern (CCS), now steamer pusher side regulating power, boiler side regulates pressure, if steamer pusher side power regulations speed is too fast, namely regulations speed is too high, main vapour pressure can be caused to fluctuate and increase, the stability run to unit cooperative and the precision of spatial load forecasting bring certain negative effect, and then have influence on other performance index such as scheduling controlling department appraisal.
Utility model content
The purpose of this utility model is exactly for solving the problem, devise the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode, it is according to the operation characteristic of unit itself, the Load Regulation speed that Dynamic Selection is applicable to the most, ensureing on the stability fundamental that unit cooperative runs, take into account the every result of appraisal of comprehensive improvement, realize source net win-win.
For achieving the above object, the utility model adopts following technical scheme:
A device for Load Regulation rate dynamic adjustment under fired power generating unit AGC mode, comprising: subtracter block DEV1, subtracter block DEV2, absolute value block ABS, function sets module F (x), analog generator A1, selector module AXSEL and high low amplitude value judge module HLALM;
Described subtracter block DEV1, absolute value block ABS, function sets module F (x) are sequentially connected in series, subtracter block DEV2 and high low amplitude value judge module HLALM is connected in series, and the output of described analog generator A1, function sets module F (x) and high low amplitude value judge module HLALM accesses the input of selector module AXSEL respectively.
The input signal of described subtracter block DEV1 is respectively: main vapour pressure set point and main vapour pressure measured value.
The input signal of described subtracter block DEV2 is respectively: unit load set point and unit load measured value.
Described function sets module F (x) for generating the respective function of main vapour pressure absolute value of the bias and regulations speed dynamic conditioning value, and exports current loads regulations speed dynamic conditioning value.
The lower limit R1 of described main vapour pressure absolute value of the bias and regulations speed dynamic conditioning value respective function is the specified regulations speed that scheduling controlling department issues, and upper limit R2 is 1.4-1.7 specified regulations speed doubly.
The higher limit input of described high low amplitude value judge module HLALM is connected with analog generator A; Numerical value and higher limit equal and opposite in direction, the direction of the lower limit input input of high low amplitude value judge module HLALM are contrary.
The Load Regulation rate dynamic adjusted value artificial for regulations speed set point sum functions setting module F (x) exported delivers to Z1 end and the Z2 end of analog quantity switch AXSEL respectively, the command signal that high low amplitude value judge module HLALM exports is delivered to the set end S of analog quantity switch AXSEL.
When the output valve of subtracter block DEV2 exceedes higher limit or the lower limit lower than high low amplitude value judge module HLALM of high low amplitude value judge module HLALM, high low amplitude value judge module HLALM sends " 1 " switching command, and the now output of selector module AXSEL is the output valve of analog generator A1; Otherwise the output of selector module AXSEL is the output valve of function sets module F (x).
The beneficial effects of the utility model are:
(1) quality of the AGC performance of grid-connected unit directly affects the stable of operation of power networks; by the utility model factors such as effectively reducing the conversion of each system in actual AGC process and Internet Transmission cause dysgenic while; the rapidity of unit to network load change response can be improved, guarantee that the Load Regulation ability of unit reaches the requirement of scheduling appraisal standards.
(2) by the dynamic conditioning of regulations speed, effectively can ensure that unit carries out load adjustment fast when main vapour pressure is stablized, to reach rapidly the load desired value of dispatching office requirement, realize the optimization of performance assessment criteria.
(3) realized the dynamic conditioning of regulations speed by the judgement of main vapour pressure deviation amplitude size, be unlikely to affect further expansion when ensureing that the fluctuation of unit main vapour pressure is larger, guarantee the safety of unit, stable operation.
Accompanying drawing explanation
Fig. 1 is that typical AGC unit sets up an office control procedure schematic diagram;
Fig. 2 is fired power generating unit conventional control units schematic diagram;
Fig. 3 is Load Regulation rate dynamic adjustment System schematic diagram under the utility model fired power generating unit AGC mode.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
The device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode, as shown in Figure 3, comprising: subtracter block DEV1, subtracter block DEV2, absolute value block ABS, function sets module F (x), analog generator A1, selector module AXSEL and high low amplitude value judge module HLALM, analog generator A, multiplier MUL and constant value-1;
Subtracter block DEV1, absolute value block ABS, function sets module F (x) are sequentially connected in series, subtracter block DEV2 and high low amplitude value judge module HLALM is connected in series, and the output of analog generator A1, function sets module F (x) and high low amplitude value judge module HLALM accesses the input of selector module AXSEL respectively.
Wherein, the output of analog generator A1 is held with the Z1 of selector module AXSEL and is connected, the output of function sets module F (x) is held with the Z2 of selector module AXSEL and is connected, and the output of high low amplitude value judge module HLALM is connected with the set end S of selector module AXSEL.
The input signal of subtracter block DEV1 is respectively: main vapour pressure set point and main vapour pressure measured value.The input signal of subtracter block DEV2 is respectively: unit load set point and unit load measured value.
Function sets module F (x) is for generating the respective function of main vapour pressure absolute value of the bias and regulations speed dynamic conditioning value; The lower limit R1 that function exports is the specified regulations speed that scheduling controlling department issues, and upper limit R2 is 1.4-1.7 specified regulations speed doubly; The requirement of " thermal power plants Thermal Automation system overhaul operation maintenance code " in the setting reference China's Electric Power Industry standard of the middle △ P1 and △ P2 of function F (x), △ P1 gets the numerical value that main vapour pressure deviation under load dynamic disturbances should be less than, and △ P2 gets the numerical value that main vapour pressure deviation under stable state should be less than.
The higher limit input of high low amplitude value judge module HLALM is connected with analog generator A, described analog generator A and constant value-1 access the input of multiplier MUL respectively, and the output of multiplier MUL is connected with the lower limit input of high low amplitude value judge module HLALM.The higher limit of high low amplitude value judge module HLALM and lower limit are 1.1-1.2 times of the AGC single Load Regulation amplitude that scheduling controlling department issues.
Operation principle of the present utility model is as follows:
Unit main vapour pressure set point and main vapour pressure measured value are delivered in subtraction block DEV1 respectively, ask for deviate between the two, and the main vapour pressure deviate asked for is delivered in absolute value block ABS, ask for the absolute value of the main vapour pressure deviation calculated; By the absolute value of main vapour pressure deviation asked for, deliver in function sets module F (x), generate main vapour pressure absolute value of the bias and regulations speed dynamic conditioning value respective function, main vapour pressure absolute value of the bias is larger, and regulations speed is lower; Main vapour pressure absolute value of the bias is less, and regulations speed is higher.
Unit load set point and load measurement are delivered in subtraction block DEV2 respectively, ask for deviate between the two, and load deviation value is delivered to high low amplitude value judge module HLALM and judge, when the higher limit of load deviation value more than HLALM module or the lower limit lower than HLALM module, send " 1 " switching command; The higher limit of HLALM module is set by analog generator A, and lower limit is multiplied by "-1 " by the set point in analog generator A, and namely upper lower limit value equal and opposite in direction, on the contrary positive and negative, and limit value size is the AGC single Load Regulation amplitude that scheduling controlling department issues.
Artificial for regulations speed set point and regulations speed dynamic conditioning value are delivered to respectively Z1 end and the Z2 end of selector module AXSEL, the command signal that high low amplitude value judge module HLALM exports is delivered to the set end S of selector module AXSEL; Namely when load variations amplitude exceeds limit value, be not now AGC mode, the value that Z1 holds by selector module AXSEL exports, and namely now Load Regulation speed is artificial set point; When load variations amplitude is less than limit value, the value that Z2 holds by selector module AXSEL exports, and namely now Load Regulation speed is dynamic conditioning value.
Concrete example 1: for the direct-firing drum boiler unit of conventional 300MW level, the AGC single Load Regulation amplitude that scheduling controlling department issues is 3MW, and specified regulations speed is 1.5%Pe=1.5%*300=4.5MW/min; According to the requirement of " thermal power plants Thermal Automation system overhaul operation maintenance code ", 300MW and above unit main vapour pressure deviation under load dynamic disturbances should be less than 0.6MPa, and stable state lower deviation should be less than 0.3MPa, and unit index side reaches qualified.
Therefore, the mid-several 3*1.1=3.3 of analog generator A, namely the upper limit of HLALM is 3, and lower limit is-3; Δ P1 in function F (x) is set to 0.2MPa, and Δ P2 is set to 0.6MPa, and R1 is 4.5MW/min, R2 is 1.6*4.5=7.2MW/min;
When unit carries out load scheduling at agc mode dispatching, because single Load Regulation amplitude is 3MW, the now output of DEV2 is less than 3.3MW, therefore the output of HLALM is digital signal " 0 ", Z2 end signal exports by AXSEL, namely the regulations speed now exported is the dynamic conditioning value calculated according to main steam power drift gage, to realize the object of stable unit operation.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection range of the present utility model.
Claims (8)
1. the device of Load Regulation rate dynamic adjustment under a fired power generating unit AGC mode, it is characterized in that, comprising: subtracter block DEV1, subtracter block DEV2, absolute value block ABS, function sets module F (x), analog generator A1, selector module AXSEL and high low amplitude value judge module HLALM;
Described subtracter block DEV1, absolute value block ABS, function sets module F (x) are sequentially connected in series, subtracter block DEV2 and high low amplitude value judge module HLALM is connected in series, and the output of described analog generator A1, function sets module F (x) and high low amplitude value judge module HLALM accesses the input of selector module AXSEL respectively.
2. the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode as claimed in claim 1, it is characterized in that, the input signal of described subtracter block DEV1 is respectively: main vapour pressure set point and main vapour pressure measured value.
3. the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode as claimed in claim 1, it is characterized in that, the input signal of described subtracter block DEV2 is respectively: unit load set point and unit load measured value.
4. the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode as claimed in claim 1, it is characterized in that, described function sets module F (x) for generating the respective function of main vapour pressure absolute value of the bias and regulations speed dynamic conditioning value, and exports current loads regulations speed dynamic conditioning value.
5. the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode as claimed in claim 4, it is characterized in that, the lower limit R1 of described main vapour pressure absolute value of the bias and regulations speed dynamic conditioning value respective function is the specified regulations speed that scheduling controlling department issues, and upper limit R2 is 1.4-1.7 specified regulations speed doubly.
6. the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode as claimed in claim 1, it is characterized in that, the higher limit input of described high low amplitude value judge module HLALM is connected with analog generator A; Numerical value and higher limit equal and opposite in direction, the direction of the lower limit input input of high low amplitude value judge module HLALM are contrary.
7. the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode as claimed in claim 1, it is characterized in that, the Load Regulation rate dynamic adjusted value artificial for regulations speed set point sum functions setting module F (x) exported delivers to Z1 end and the Z2 end of analog quantity switch AXSEL respectively, the command signal that high low amplitude value judge module HLALM exports is delivered to the set end S of analog quantity switch AXSEL.
8. the device of Load Regulation rate dynamic adjustment under a kind of fired power generating unit AGC mode as claimed in claim 7, it is characterized in that, when the output valve of subtracter block DEV2 exceedes higher limit or the lower limit lower than high low amplitude value judge module HLALM of high low amplitude value judge module HLALM, high low amplitude value judge module HLALM sends " 1 " switching command, and the now output of selector module AXSEL is the output valve of analog generator A1; Otherwise the output of selector module AXSEL is the output valve of function sets module F (x).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842946A (en) * | 2017-02-21 | 2017-06-13 | 国网山东省电力公司电力科学研究院 | Load emergent method of adjustment and device under fired power generating unit AGC modes |
| CN112072673A (en) * | 2020-09-10 | 2020-12-11 | 华能国际电力股份有限公司玉环电厂 | Power plant power generation side load response method and system thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842946A (en) * | 2017-02-21 | 2017-06-13 | 国网山东省电力公司电力科学研究院 | Load emergent method of adjustment and device under fired power generating unit AGC modes |
| CN106842946B (en) * | 2017-02-21 | 2020-06-05 | 国网山东省电力公司电力科学研究院 | Load emergency adjusting method and device under AGC mode of thermal power generating unit |
| CN112072673A (en) * | 2020-09-10 | 2020-12-11 | 华能国际电力股份有限公司玉环电厂 | Power plant power generation side load response method and system thereof |
| CN112072673B (en) * | 2020-09-10 | 2022-05-06 | 华能国际电力股份有限公司玉环电厂 | Power plant power generation side load response method and system thereof |
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