CN106597138A - Generator set AGC test evaluation method - Google Patents
Generator set AGC test evaluation method Download PDFInfo
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- CN106597138A CN106597138A CN201510669691.9A CN201510669691A CN106597138A CN 106597138 A CN106597138 A CN 106597138A CN 201510669691 A CN201510669691 A CN 201510669691A CN 106597138 A CN106597138 A CN 106597138A
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Abstract
The invention relates to an evaluation method of an AGC test performed by a power grid dispatching center and a power plant generator set. The method is characterized in that through analyzing set AGC test data and comparing to a corresponding quality index, set AGC performance can be correspondingly evaluated and finally a test evaluation result ( excellent, qualified and unqualified) is acquired. The method is used to carry out test evaluation on a power plant set and functions of a DCS control system (mainly a CCS coordination control system) and a remote-action system (RTU).
Description
Technical field
The present invention relates to a kind of generating set AGC Test model synthetic techniques, the evaluation methodology of AGC tests is carried out there is provided a kind of grid dispatching center and power plants generating electricity unit, the method by unit AGC test data analyzers and with the corresponding index of quality contrast after, corresponding evaluation can be made to unit AGC performances, test evaluation result is finally drawn.The method is related to technology and is mainly used in Power Plant, DCS control systems（Mainly CCS coordinated control systems）And telecontrol system（RTU）Function carries out test evaluation.
Background technology
According to requirement of the electrical network to AGC operating units, the regulation efficiency of AGC operating units is decomposed into three key elements：Adjust Rong Liang ﹑ regulations speeds and degree of regulation.Pondage refers under normal circumstances, peak power and the difference of minimum power that AGC operating units controlled period can reach.Pondage is to determine one of importance of AGC operating unit system effectiveness sizes, and contribution of the big unit of pondage to system is big, otherwise then contributes little.Regulations speed refers to the speed of unit responding power instruction, and it includes climbing speed and fall off rate.In actual motion, due to affected by various factors, unit regulations speed is often variant with setting value, and difference is also very big sometimes.Degree of regulation refers to the difference between the last firm power of unit and target power value.In actual motion, after set steady, its power is often had differences and power instruction between, and this can bring negative effect to system stable operation.To AGC operating unit requirements, also there is important directive function to AGC test evaluations equally.
At present, the evaluation index of unit AGC tests mainly considers regulations speed and degree of regulation, and response delay time, does not consider to adjust capacity of experiment.In actual use, there is following practical problem：1. differ greatly due to carrying out unit operational factor when AGC is tested, operational factor is larger to load variations range effects during test, causes that AGC test load excursions are less, and test data is not comprehensive enough.2. due to not considering capacity of experiment index, cause test evaluation index not comprehensive enough, result of the test lacks credibility.
With reference to power industry standard DL/T 657-2006《Thermal power plant analog control system Acceptance Test code》In to AGC load follows test technical requirements, on the basis of former code, we to the AGC load follow test behaviour index of quality carried out expand, improve and optimize, increased the capacity of experiment index of quality so as to more feasibility and practicality.
In DL/T 657-2006《Thermal power plant analog control system Acceptance Test code》In, there is specific requirement to one of index of analog control system quality, i.e. the AGC load follows test behaviour index of quality.Index is shown in Table 1 content.
The 1 AGC load follow test behaviour index of quality of table.
Although this active target has formulated particular technique requirement to the test of AGC load follows, also there is important directive significance to carrying out electrical network AGC tests, but from the point of view of Large-scale fire-electricity unit in recent years implements the effect of AGC tests, the index is perfect not enough, also needs further to improve, optimize and improve..
The content of the invention
The technical problem to be solved is that, for above-mentioned deficiency of the prior art, on the basis of former code, proposition carries out the new evaluating method of AGC tests to power plants generating electricity unit, creatively increased the capacity of experiment index of quality.By to unit AGC test data analyzers and with the contrast of the corresponding index of quality after, corresponding evaluation can be made to unit AGC performances, it is as excellent, qualified and unqualified.The present invention solves that AGC test load excursions are less, not comprehensive etc. enough practical problem of test evaluation index, the AGC tests index of quality has been carried out expanding, improve and optimizing so as to more feasibility and practicality.
The technical solution used in the present invention proposes following 4 points of improvement to AGC test evaluations index：
（1）Increase the capacity of experiment index of quality so that the AGC load follow test behaviour index of quality are more perfect；
（2）The pure delay time index of load responding in former active target, according to the AGC test situations for actually carrying out in recent years from the point of view of, hence it is evident that deviation is excessive, is not inconsistent with practical situation, need improve and it is perfect；
（3）Former active target only has qualified index, and no excellent measure, differentiation are not careful enough；And in the load change test behaviour index of quality existing qualified index, have excellent measure again.So excellent measure should be increased to the test of AGC load follows, to optimize and improve the active target；
（4）Some detail criterias in former active target can also suitably simplify and refine so as in specific AGC test practices have more feasibility and practicality.The index parameters such as reheat steam temperature degree, steam water-level, furnace pressure and flue gas oxygen content and electrical network relation are not too closely, to carry out the change of these parameters is considered when AGC is tested；And although main vapour pressure and Stream temperature degree parameter are also with electrical network relation less, the two parameters are the important parameters for reflecting unit operation situation, so still being retained.
Improve and perfect problem for the above-mentioned needs that the AGC load follow test behaviours index of quality is present, with reference to the concrete practice experience for carrying out AGC tests in recent years, the AGC load follow test behaviour index of quality after expanding, improving and optimize are proposed on the basis of systematic analysiss, this is for guidance and the test of specification AGC are with important reference value.The AGC load follow test behaviour index of quality after optimization are shown in Table 2 contents.
The AGC load follow test behaviour index of quality after the optimization of table 2.
This evaluation methodology problem to be solved is based in this respect, and on the basis of former code, we have carried out expanding, improve and optimizing to the AGC load follow test behaviour index of quality, increased the capacity of experiment index of quality so as to more feasibility and practicality.
The present invention has advantages below compared with prior art：
1st, reasonable in design, realization is conveniently and input cost is low, using easy to operate, is capable of achieving using existing DCS control systems；
2nd, test data result is analyzed using this evaluation methodology, then provides excellent, qualified and underproof judgement.This is expanded, improves and optimize Test model synthetic techniques to solve the practical problem in engineering；
3rd, the AGC load follow test behaviour index of quality after optimizing are compared with former active target, feasibility and practicality are had more in AGC test practices, the index of quality is also more careful and perfect, for AGC experiment works from now on have important reference value and directive function.
In sum, the present invention is reasonable in design, it is convenient and good using easy to operate, using effect to realize, the AGC test load excursions that the existing unit AGC test evaluations index of energy effectively solving is present are less, test data is not comprehensive enough, test evaluation index is not comprehensive enough, result of the test lack credibility the problems such as.
Description of the drawings
Fig. 1 is unit AGC test evaluation flow charts.
Specific embodiment
After unit AGC tests are completed, by unit actual AGC test datas parameter with optimize after the AGC load follow test behaviour index of quality contrasted, you can draw unit AGC result of the tests, you can unit AGC is tested and makes the judgement of excellent, acceptance or rejection.
Can carry out according to the following steps in the specific implementation：
（1）First unit AGC capacity of experiment is calculated.Capacity of experiment is the percentage ratio of the actual actual load scope carried out when AGC is tested of unit and the load range of unit AGC test requirements documents.Calculate actual load scope and can adopt the difference for carrying out maximum load when AGC is tested and minimum load；50%-100% of the load range of AGC test requirements documents for unit rated load.For direct-firing unit, capacity of experiment >=80% is excellent, and capacity of experiment >=60% is qualified, otherwise for unqualified；For middle storage formula unit, capacity of experiment >=85% is excellent, and capacity of experiment >=65% is qualified, otherwise for unqualified；
（2）Load -response-speed when testing to unit AGC is calculated.Load -response-speed includes load climbing speed and load fall off rate, and when can adopt test, the Mean Speed of certain time period be represented, i.e. the ratio of the unit load variable quantity of the time period and the time period.The actual rate of load change carried out when AGC is tested of unit sets the percentage ratio of speed with unit load.For direct-firing unit, the speed of response >=70% is excellent, and the speed of response >=66.6% is qualified, otherwise for unqualified；For middle storage formula unit, the speed of response >=80% is excellent, and the speed of response >=75% is qualified, otherwise for unqualified；
（3）Response time when testing to unit AGC is calculated.Response time is the unit actual load responding pure delay time carried out when AGC is tested（Second）.For direct-firing unit, response time≤30s is excellent, and response time≤60s is qualified, otherwise for unqualified；For middle storage formula unit, response time≤20s is excellent, and response time≤40s is qualified, otherwise for unqualified；
（4）Response accuracy when testing to unit AGC is calculated.Response accuracy is the percentage ratio of the actual load deviation carried out when AGC is tested of unit and unit rated load.The difference between actual negative charge values and AGC load instruction values when the actual load deviation carried out when AGC is tested of unit refers to that unit load change reaches stable.No matter direct-firing unit or in storage formula unit, response accuracy less than ± 3% for excellent, response accuracy less than ± 5% for qualified, otherwise for unqualified；
（5）Main vapour pressure changing value when testing to unit AGC is calculated.Unit main vapour pressure changing value refer to actual main vapour pressure value of unit load change when reaching stable and carry out AGC tests before difference between unit main vapour pressure value.For direct-firing unit, main vapour pressure changing value is excellent less than ± 0.5MPa, and main vapour pressure changing value is qualified less than ± 0.6MPa, otherwise for unqualified；For middle storage formula unit, main vapour pressure changing value is excellent less than ± 0.4MPa, and main vapour pressure changing value is qualified less than ± 0.5MPa, otherwise for unqualified；
（6）Stream temperature degree changing value when testing to unit AGC is calculated.Unit Stream temperature degree changing value refer to actual Stream temperature angle value of unit load change when reaching stable and carry out AGC tests before difference between unit Stream temperature angle value.No matter direct-firing unit or in storage formula unit, Stream temperature degree changing value less than ± 8 DEG C for excellent, Stream temperature degree changing value less than ± 10 DEG C for qualified, otherwise for unqualified.
Claims (1)
1. a kind of generating set AGC Test model synthetic techniques, it is characterised in that：The evaluation methodology of AGC tests is carried out there is provided a kind of grid dispatching center and power plants generating electricity unit, the method creatively increased the capacity of experiment index of quality, the AGC tests index of quality has been carried out expanding, improve and optimizing, which is made to have more feasibility and practicality, by to unit AGC test data analyzers and with the corresponding index of quality contrast after, corresponding evaluation can be made to unit AGC performances, test evaluation result is finally drawn（It is excellent, qualified and unqualified）, the method is related to technology and is mainly used in Power Plant, DCS control systems（Mainly CCS coordinated control systems）And telecontrol system（RTU）Function carries out test evaluation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111537256A (en) * | 2020-05-22 | 2020-08-14 | 华能平凉发电有限责任公司 | Method and system for analyzing reason for unqualified AGC (automatic gain control) performance of thermal generator set |
| CN112711237A (en) * | 2020-12-29 | 2021-04-27 | 华润电力技术研究院有限公司 | Automatic control quality online evaluation method and system for thermal power generating unit |
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Application publication date: 20170426 |