CN113657738A - Method for checking whether actual measurement load curve of coal-fired unit reaches standard - Google Patents
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Abstract
The invention relates to a method for checking whether an actual measurement load curve of a coal-fired unit reaches the standard, which comprises the steps of calculating the load curve of the unit when the frequency changes; when the unit frequency changes, the unit load is changed from P1When the step is started, the time t is recorded1Locating the intersection point a of the moment and the initial load; t is t1The +15s time should correspond to the load P1+ 75% Δ P, locating the intersection b with the load at that time; t is t1The +30s time should correspond to the load P1+ 90% Δ P, locating the intersection c with the load at that time; respectively connecting ab and bc with straight line, extending bc and target load P2Intersecting point d, the load curve should be in the upper region of the abc connecting line and the stable value should not exceed P2If the area is not in the area, the system parameters are adjusted and then the test is carried out again under the working condition. The method can help the tester to check and analyze the actual measurement load curve, and can quickly and accurately determineAnd whether the actual measurement curve is qualified or not is determined, the actual measurement efficiency is improved, the time of the unit grid-related test is reduced, and the compiling and auditing period of the modeling report is shortened.
Description
Technical Field
The invention belongs to the field of thermal power generation grid-related tests, relates to a detection technology of an actual measurement load curve of a parameter of a coal-fired unit adjusting system, and particularly relates to a method for checking whether the actual measurement load curve of the coal-fired unit reaches the standard.
Background
The prime motor regulation system is actually measured and modeled, accurate calculation data is provided for system stability analysis and power grid daily production scheduling, the method is an effective measure for ensuring the safe operation of the power grid and improving the labor productivity, and has important social significance and economic benefit. Different prime movers and adjusting system models and parameters thereof are adopted in the power system stability calculation, and the calculation results have larger difference. Therefore, mathematical models and parameters which can correctly reflect the actual equipment running state are adopted in the system calculation analysis, so that the calculation result is real and reliable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the calculation method for rapidly checking whether the measured load curve of the coal-fired unit adjusting system parameter modeling test reaches the standard or not, so that the reasonability of the measured curve of the test is enhanced, the test quality is improved, and the time for modeling the measured curve when compiling the report is shortened.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for checking whether an actual measurement load curve of a coal-fired unit reaches the standard or not comprises the following steps:
(1) calculating the step quantity of a load curve of the unit when the frequency changes according to the formula (1) by the rated power generation power and the unequal rate of the rotating speed of the unit;
wherein, the delta P is the theoretical step quantity of the load curve of the unit, PForehead (forehead)The rated generating power of the unit and the delta r are the rotating speed deviation; delta is the rotating speed unequal rate;
target load is P2＝P1+ΔP (2)
In the formula P2For unit target load, P1Setting the initial load of the unit;
(2) determining the change rate range of the load curve meeting the standard requirement by combining the moment when the load starts to step when the frequency changes, wherein the steps are as follows:
firstly, when the frequency of the unit changes, the load of the unit changes from P1When the step is started, the time t is recorded1Locating the intersection point a of the moment and the initial load;
②t1the +15s time should correspond to the load P1+ 75% Δ P, locating the intersection b with the load at that time;
③t1the +30s time should correspond to the load P1+ 90% Δ P, locating the intersection c with the load at that time;
respectively connecting ab and bc with straight line, extending bc and target load P2Intersecting point d, the load curve should be in the upper region of the abc connecting line and the stable value should not exceed P2If not, the adjustment system parameters should be adjustedAfter several times, the test was carried out again in this operating condition.
Moreover, the unit to be tested needs to have more than 80% of rated load, and the frequency difference variation needs to be more than +/-0.15 Hz.
Furthermore, the rated generating power P of the unitForehead (forehead)The rated power of the generator nameplate of the unit.
And the rotating speed unequal rate delta is a primary frequency modulation test result of the unit, and a parameter modeling test of the regulating system is performed after the primary frequency modulation test.
The method of the invention calculates the reasonable change interval of the unit load curve when the frequency changes when the coal-fired unit is subjected to the actual measurement and modeling test of the parameters of the regulating system according to the rated power and the unequal rate of the rotating speed of the coal-fired unit, the upper and lower limits of the primary frequency modulation load and the requirements of the parameter actual measurement and modeling guide rule of the synchronous generator prime mover and the regulating system thereof (DL/T1235 and 2019) on the load change regulating time of the coal-fired unit and the peak power time of the high-pressure cylinder.
Further, the actual measurement and modeling of the parameters of the adjusting system of the coal-fired unit are divided into a static test and a load test, the actual measurement of the parameters of the adjusting system of the coal-fired unit is a load test part, the unit needs to carry more than 80% of rated load, and the frequency difference change needs to be more than +/-0.15 Hz (+/-9 revolutions).
Furthermore, the rotating speed unequal rate of the thermal power generating unit is set in a DEH system, and the requirement of 3% -6% is met, namely the thermal power generating unit is required to complete a primary frequency modulation test before the actual measurement and modeling test of the parameters of the regulating system and is qualified in the test.
Further, the requirement of the primary frequency modulation test and performance acceptance guide (GBT 30370) of the thermal power generating unit (GBT 20170), the time for the coal-fired unit to reach 75% of the target load is not more than 15 seconds, and the time for the coal-fired unit to reach 90% of the target load is not more than 30 seconds.
The invention has the advantages and positive effects that:
the method can help testers to check and analyze the actual measurement load curve, quickly determine whether the actual measurement curve is qualified or not, improve the actual measurement efficiency, reduce the time of the unit network-related test, shorten the compiling and auditing period of the modeling report, facilitate the newly-built unit to quickly enter the commissioning through the auditing of the regulation and control center, provide correct mathematical models and parameters for the system calculation and analysis, preliminarily check the actual measurement curve of the test, and facilitate the testers to adjust and retest the unit operation when the load curve does not meet the requirements.
Drawings
FIG. 1 is a schematic diagram of the calculation process of the method of the present invention.
FIG. 2 is a schematic view of the load zone of the method of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
When the WFLC-V type electric quantity recording analyzer is used for recording the actual measurement curve, the actual measurement curve is preliminarily checked, and when the load curve does not meet the requirement, the operation of the unit is adjusted and retested.
A calculation method for rapidly checking whether a measured load curve of a parameter modeling test of a coal-fired unit adjusting system reaches the standard or not comprises the following specific steps:
(1) calculating the step quantity of a load curve of the unit when the frequency changes according to the formula (1) by the rated power generation power and the unequal rate of the rotating speed of the unit;
in the formula, the delta P is the theoretical step quantity of a load curve of the unit and the unit MW; pForehead (forehead)The rated generating power of the unit is unit MW; pForehead (forehead)The rated generating power of the unit is the power value on the nameplate of the generator of the unit;
delta r is the deviation of the rotating speed in the unit of r/min; delta is the rate of rotation inequality in%. The unequal rate of the rotating speed is the primary frequency modulation test result of the unit, and the parameter modeling test of the regulating system is carried out after the primary frequency modulation test.
From the formula (1), the target load is P2＝P1+ΔP (2)
In the formula P2The unit is a unit MW for the target load of the unit; p1The unit is the initial load of the unit, unit MW; the stable value of the actually measured load curve after the step change can not exceed the target load P2。
(2) According to the GBT30370-2013 requirements, the time for the coal-fired unit to reach 75% of the target load is not more than 15 seconds, and the time for the coal-fired unit to reach 90% of the target load is not more than 30 seconds: and determining the change rate range of the load curve meeting the standard requirement by combining the moment when the load starts to step when the frequency changes. The method comprises the following steps:
firstly, when the frequency of the unit changes, the load of the unit changes from P1When the step is started, the time t is recorded1(ii) a Locating the intersection point a of the time and the initial load
②“t1The +15s "time corresponds to the load" P1+ 75%. DELTA.P "; locating the intersection point b of the moment and the load;
③“t1the +30s time should correspond to the load "P1+ 90%. DELTA.P "; locating the intersection point c of the moment and the load;
respectively connecting ab and bc with straight line, extending bc and target load P2Intersecting point d, the range of the actually measured load curve is determined, the load curve is in the upper area of the abc connecting line, and the stable value cannot exceed P2Such as the hatched area in fig. 2.
If the actually measured load curve appears in the interval, the curve trend is reasonable, and the later modeling simulation is convenient; if the actually measured load curve does not appear outside the 'interval', the parameters of the regulating system are regulated and then the test is carried out again under the working condition, so that the reasonability of the actually measured curve of the test is enhanced, the test quality is improved, and the time for modeling the actually measured curve when compiling the report is shortened.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (4)
1. A method for checking whether an actual measurement load curve of a coal-fired unit reaches the standard or not comprises the following steps:
(1) calculating the step quantity of a load curve of the unit when the frequency changes according to the formula (1) by the rated power generation power and the unequal rate of the rotating speed of the unit;
wherein, the delta P is the theoretical step quantity of the load curve of the unit, PForehead (forehead)The rated generating power of the unit and the delta r are the rotating speed deviation; delta is the rotating speed unequal rate;
target load is P2＝P1+ΔP (2)
In the formula P2For unit target load, P1Setting the initial load of the unit;
(2) determining the change rate range of the load curve meeting the standard requirement by combining the moment when the load starts to step when the frequency changes, wherein the steps are as follows:
firstly, when the frequency of the unit changes, the load of the unit changes from P1When the step is started, the time t is recorded1Locating the intersection point a of the moment and the initial load;
②t1the +15s time should correspond to the load P1+ 75% Δ P, locating the intersection b with the load at that time;
③t1the +30s time should correspond to the load P1+ 90% Δ P, locating the intersection c with the load at that time;
respectively connecting ab and bc with straight line, extending bc and target load P2Intersecting point d, the load curve should be in the upper region of the abc connecting line and the stable value should not exceed P2If the area is not in the area, the system parameters are adjusted and then the test is carried out again under the working condition.
2. The method of claim 1, wherein: the unit to be tested needs to carry more than 80% of rated load, and the frequency difference variation needs to be more than +/-0.15 Hz.
3. The method of claim 1, wherein: rated generating power P of the unitForehead (forehead)The rated power of the generator nameplate of the unit.
4. The method of claim 1, wherein: the rotating speed unequal rate delta is a primary frequency modulation test result of the unit, and a parameter modeling test of the regulating system is performed after the primary frequency modulation test.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871842A (en) * | 2010-04-13 | 2010-10-27 | 山东电力研究院 | Method for directly testing speed diversity factor and stagnant rate of turbine electro-hydraulic control system |
| CN102611124A (en) * | 2012-03-10 | 2012-07-25 | 山东电力研究院 | Primary frequency regulation control method applicable to thermal generator set of intelligent power grid |
| CN111638410A (en) * | 2020-05-22 | 2020-09-08 | 国网天津市电力公司电力科学研究院 | Primary frequency modulation dynamic test method for thermal generator set |
| CN111650511A (en) * | 2020-05-22 | 2020-09-11 | 国网天津市电力公司电力科学研究院 | Single-signal-based generator set primary frequency modulation remote disturbance test method |
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2021
- 2021-08-05 CN CN202110895425.3A patent/CN113657738A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871842A (en) * | 2010-04-13 | 2010-10-27 | 山东电力研究院 | Method for directly testing speed diversity factor and stagnant rate of turbine electro-hydraulic control system |
| CN102611124A (en) * | 2012-03-10 | 2012-07-25 | 山东电力研究院 | Primary frequency regulation control method applicable to thermal generator set of intelligent power grid |
| CN111638410A (en) * | 2020-05-22 | 2020-09-08 | 国网天津市电力公司电力科学研究院 | Primary frequency modulation dynamic test method for thermal generator set |
| CN111650511A (en) * | 2020-05-22 | 2020-09-11 | 国网天津市电力公司电力科学研究院 | Single-signal-based generator set primary frequency modulation remote disturbance test method |
Non-Patent Citations (1)
| Title |
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| 旷仲和;: "汽机一次调频转差与调频负荷关系的探讨", 热力透平, vol. 38, no. 4, 31 December 2009 (2009-12-31), pages 273 - 276 * |
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