CN105019952A - Control method for improving load response of primary frequency modulation - Google Patents
Control method for improving load response of primary frequency modulation Download PDFInfo
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- CN105019952A CN105019952A CN201510376847.4A CN201510376847A CN105019952A CN 105019952 A CN105019952 A CN 105019952A CN 201510376847 A CN201510376847 A CN 201510376847A CN 105019952 A CN105019952 A CN 105019952A
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Abstract
The invention relates to a control method for improving the load response of primary frequency modulation. The control method comprises: additionally arranging a rapid control module on the basis of a unit primary frequency modulation control system, receiving a rotating speed difference signal and a power output signal by the rapid control module, and overlapping the output of the rapid control module with a comprehensive opening command signal in an original system; setting a judging link in the rapid control module; setting a function link in the rapid control module; setting an integral link in the rapid control module; and in the rapid control module, setting a judging link and setting a gas turbine opening upper limit. The method can reduce the load difference in the modulation process and improve the unit safety on the basis of finishing the main modulation mission and cannot cause large fluctuation to unit parameters.
Description
Technical field
The invention belongs to Automatic Generation Control technical field, particularly a kind of controlling method improving primary frequency modulation load responding.
Background technique
Primary frequency modulation is designed by digital electric-hydraulic control system (DEH) side and the design of decentralized control system (CCS) side forms, the primary frequency control system that both sides structure one is complete.
Design method speed discrepancy signal being directly superimposed upon speed regulation valve of steam turbine instruction place through speed governor droop design function is taked in the design of DEH side, the power instruction of DEH loop of power circuit also carries out frequency modulation power fixed value compensation according to speed governor droop design objective simultaneously, and the frequency modulation power definite value part of compensation is without rate limit.The design of CCS side adopts decentralized control system (DCS) and has the unit of unit cooperative control and Automatic Generation Control (AGC) function, jointly completes primary frequency function by DEH, CCS.DEH takes side design method speed discrepancy signal being directly superimposed upon speed regulation valve of steam turbine instruction place through speed governor droop design function, and in CCS design frequency corrective loop, and the correction instruction in CCS is without rate limit.In electric power system, define the speed of response of unit primary frequency modulation, coal unit primary frequency modulation responds 15 seconds planted agents and reaches 75% of primary frequency modulation target load, reaches the index of 90% of target load in 30 seconds simultaneously.Under this index at utmost can meet grid disturbance, to the demand of unit primary frequency modulation supporting effect in 15 seconds, the primary frequency modulation characteristic of coal unit also can be given full play to.Gas Generator Set 15 seconds planted agents reach 90% of primary frequency modulation target load, at utmost to play Gas Generator Set advantage.Current most of unit also should improve load responding speed, realizes the rapidity of primary frequency regulation of power network.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, and propose a kind of controlling method improving primary frequency modulation load responding.
The present invention solves its technical problem and takes following technological scheme to realize:
Improve the controlling method of primary frequency modulation load responding, comprise method content as follows:
(1) on the basis of unit primary frequency modulation control system, quick control module is increased, quick control module exports with original system medium speed difference and is connected, reception speed discrepancy outputs signal, be connected with power stage in original system, received output power signal, in the output of this quick control module and original system, comprehensively opening degree instruction signal is superimposed;
(2) judgement link is set in quick control module, when quick control module receives speed discrepancy signal, triggers startup immediately;
(3) function link is set in quick control module, quick control module can receive unit actual power signal after starting, quick control module is according to speed discrepancy instruction and unit actual power, calculate the main valve bit motion amount that unit load makes an immediate response required, then main valve bit motion amount is superimposed upon on the comprehensive opening degree instruction of unit load controller;
(4) in quick control module, arrange integral element, the unit load variable quantity in cumulative certain hour, judging whether unit load responds according to plan fast, as not having, continuing to add great synthesis opening degree instruction, strengthens valve position;
(5) judgement link is set in quick control module, the setting steam turbine aperture upper limit.
And, the concrete grammar of described step (3) is: when quick control module receives the instruction of speed discrepancy, if rotating speed rises, quick control module response, reduces the comprehensive aperture of steam turbine immediately, load is declined, if rotating speed declines, quick control module response, increases the comprehensive aperture of steam turbine, make load increase, primary frequency modulation overall process will proceed on this basis.
Advantage of the present invention and good effect are:
1, in the inventive method when unit receives the instruction of speed discrepancy, change the comprehensive aperture of steam turbine immediately, respond fast, load is changed.Primary frequency modulation overall process will proceed on this basis, on the basis completing total adjustment task, reduce the load deviation in mediation process.
2, in the inventive method, steam turbine aperture is provided with the upper limit, improves unit safety, can not cause the great fluctuation process of unit parameter.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Be further described the invention process below in conjunction with accompanying drawing, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
Improve a controlling method for primary frequency modulation load responding, as shown in Figure 1, comprise method content as follows:
(2) on the basis that unit primary frequency modulation controls, quick control module is increased, quick control module exports with original system medium speed difference and is connected, reception speed discrepancy outputs signal, be connected with power stage in original system, received output power signal, in the output of this quick control module and original system, comprehensively opening degree instruction signal is superimposed;
(2) judgement link is set in quick control module, when quick control module receives speed discrepancy signal, triggers startup immediately;
(3) function link is set in quick control module, quick control module can receive unit actual power signal after starting, quick control module is according to speed discrepancy instruction and unit actual power, calculate the main valve bit motion amount that unit load makes an immediate response required, then main valve bit motion amount is superimposed upon on the comprehensive opening degree instruction of unit load controller; Concrete,
When quick control module receives the instruction of speed discrepancy, if rotating speed rises, quick control module response, reduces the comprehensive aperture of steam turbine immediately, load is declined, if rotating speed declines, quick control module response, increases the comprehensive aperture of steam turbine, load is made to increase, primary frequency modulation overall process will proceed on this basis, on the basis completing total adjustment task, reduce the load deviation in mediation process.
(4) in quick control module, arrange integral element, the unit load variable quantity in cumulative certain hour, judging whether unit load responds according to plan fast, as not having, continuing to add great synthesis opening degree instruction, strengthens valve position;
(5) in quick control module, arrange judgement link, the setting steam turbine aperture upper limit, improves unit safety, can not cause the great fluctuation process of unit parameter.
Claims (2)
1. improve a controlling method for primary frequency modulation load responding, it is characterized in that: comprise method content as follows:
(1) on the basis of unit primary frequency modulation control system, quick control module is increased, quick control module exports with original system medium speed difference and is connected, reception speed discrepancy outputs signal, be connected with power stage in original system, received output power signal, in the output of this quick control module and original system, comprehensively opening degree instruction signal is superimposed;
(2) judgement link is set in quick control module, when quick control module receives speed discrepancy signal, triggers startup immediately;
(3) function link is set in quick control module, quick control module can receive unit actual power signal after starting, quick control module is according to speed discrepancy instruction and unit actual power, calculate the main valve bit motion amount that unit load makes an immediate response required, then main valve bit motion amount is superimposed upon on the comprehensive opening degree instruction of unit load controller;
(4) in quick control module, arrange integral element, the unit load variable quantity in cumulative certain hour, judging whether unit load responds according to plan fast, as not having, continuing to add great synthesis opening degree instruction, strengthens valve position;
(5) judgement link is set in quick control module, the setting steam turbine aperture upper limit.
2. the controlling method of raising primary frequency modulation load responding according to claim 1, it is characterized in that: the concrete grammar of described step (3) is: when quick control module receives the instruction of speed discrepancy, if rotating speed rises, quick control module response, reduces the comprehensive aperture of steam turbine immediately, load is declined, if rotating speed declines, quick control module response, increases the comprehensive aperture of steam turbine, make load increase, primary frequency modulation overall process will proceed on this basis.
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Cited By (5)
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| CN106089447A (en) * | 2016-07-05 | 2016-11-09 | 国网天津市电力公司 | A kind of method promoting gas turbine group primary frequency modulation responding ability |
| CN107061132A (en) * | 2016-12-15 | 2017-08-18 | 贵州北盘江电力股份有限公司董箐发电厂 | A kind of power station speed regulator power closed-loop adjustment improves power adjusting speed and the regulating system of degree of regulation |
| CN107359624A (en) * | 2017-07-18 | 2017-11-17 | 国网新疆电力公司电力科学研究院 | The method for improving unit primary frequency modulation response precision |
| CN107725123A (en) * | 2017-08-18 | 2018-02-23 | 中国神华能源股份有限公司 | The control method and device of steam turbine |
| CN111884264A (en) * | 2020-07-22 | 2020-11-03 | 国网天津市电力公司电力科学研究院 | Automatic power generation control intelligent variable speed control method for thermal generator set |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089447A (en) * | 2016-07-05 | 2016-11-09 | 国网天津市电力公司 | A kind of method promoting gas turbine group primary frequency modulation responding ability |
| CN107061132A (en) * | 2016-12-15 | 2017-08-18 | 贵州北盘江电力股份有限公司董箐发电厂 | A kind of power station speed regulator power closed-loop adjustment improves power adjusting speed and the regulating system of degree of regulation |
| CN107061132B (en) * | 2016-12-15 | 2019-07-09 | 贵州北盘江电力股份有限公司董箐发电厂 | A kind of power station governor power closed-loop adjustment improves the regulating system of power regulation speed and degree of regulation |
| CN107359624A (en) * | 2017-07-18 | 2017-11-17 | 国网新疆电力公司电力科学研究院 | The method for improving unit primary frequency modulation response precision |
| CN107359624B (en) * | 2017-07-18 | 2020-04-10 | 国网新疆电力公司电力科学研究院 | Method for improving primary frequency modulation response accuracy of unit |
| CN107725123A (en) * | 2017-08-18 | 2018-02-23 | 中国神华能源股份有限公司 | The control method and device of steam turbine |
| CN107725123B (en) * | 2017-08-18 | 2020-07-14 | 中国神华能源股份有限公司 | Method and device for controlling a steam turbine |
| CN111884264A (en) * | 2020-07-22 | 2020-11-03 | 国网天津市电力公司电力科学研究院 | Automatic power generation control intelligent variable speed control method for thermal generator set |
| CN111884264B (en) * | 2020-07-22 | 2023-09-29 | 国网天津市电力公司电力科学研究院 | Intelligent variable rate control method for automatic power generation control of thermal generator set |
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