CN113364010A - Unit frequency modulation mode judgment method - Google Patents
Unit frequency modulation mode judgment method Download PDFInfo
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- CN113364010A CN113364010A CN202110694396.4A CN202110694396A CN113364010A CN 113364010 A CN113364010 A CN 113364010A CN 202110694396 A CN202110694396 A CN 202110694396A CN 113364010 A CN113364010 A CN 113364010A
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- frequency modulation
- modulation mode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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- Power Engineering (AREA)
- Feedback Control In General (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
The invention provides a method for judging a frequency modulation mode of a unit. The frequency mode judging method of the invention judges the AGC instruction reversal through the product of the adjacent secondary AGC step length being negative, judges whether the AGC instruction changes frequently according to the variable load rate linearity, and triggers the frequency modulation mode by adopting a specific triggering strategy based on the AGC instruction. The frequency modulation mode judgment method can adjust the trigger threshold, screen the instruction change section and select the proper reset threshold to exit the frequency modulation mode in time. The frequency modulation mode judgment method can effectively avoid the difficulty in tracking the unit load.
Description
Technical Field
The invention relates to the field of generator sets, in particular to a method for judging a frequency modulation mode of a set.
Background
In recent years, renewable energy in China continues to grow rapidly, and the problem of grid connection consumption is prominent. In order to promote the coordinated development and effective utilization of renewable energy sources, each province successively issues a frequency modulation auxiliary service mileage compensation policy and forms a complementary relationship with a new energy source unit. Under the guidance of files such as AGC power generation unit frequency modulation index calculation specifications and the like, thermal power generating units strive to promote auxiliary frequency modulation plug-in service, market competitiveness of the units is optimized, variable load rate of the units is improved, and mileage compensation of the auxiliary frequency modulation service is obtained. The dispatching mechanism measures and calculates market frequency modulation capacity requirements, evaluates comprehensive frequency modulation performance of each power generation unit, selects part of units to participate in frequency modulation service (called winning for short or the units are in a frequency modulation mode), and cannot accurately predict the variable load of the units in the frequency modulation mode due to the fact that the variable load of the units is very frequent and the characteristics such as periodicity do not exist.
Because the heat release inertia time of the boiler is long, fuel must be added or reduced in advance to improve the variable load rate, the AGC instruction changes frequently and is often reversed in the frequency modulation mode, the fuel action time interval is easily reversed with the AGC instruction, and further large steam pressure and steam temperature fluctuation is caused, so that the accurate judgment of the frequency modulation mode is the key point for stabilizing the parameters of the unit. The unit can not send a bid-winning result instruction after bid-winning scheduling, and a mature frequency modulation mode judging method is not available at present, so that the bid-winning condition cannot be known in real time. The existing methods for judging whether the generator set is in the frequency modulation mode have the following defects: and (4) putting in/exiting from a frequency modulation mode after manual visual inspection, and analyzing the AGC instruction change condition in real time by an operator to roughly estimate whether to win a bid. The method depends heavily on the experience of operators and cannot automatically switch on or off. The AGC command is put into a frequency modulation mode when changing quickly, and a common AGC command is easily judged as the frequency modulation mode by mistake, so that the adjusting performance of the unit is reduced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for judging the frequency modulation mode of a unit. In order to achieve the purpose of the invention, the technical scheme of the invention is as follows.
A method for judging the frequency modulation mode of machine set features that after winning a bid in machine set, the machine set can judge if the bid is correctPn、Pn+1Opposite sign and Δ t<When T is reached, triggering a frequency modulation mode based on an AGC instruction; where, t is2-t1，T is a predetermined time threshold, T1Is SP and PenAt equal times, SP is set for the unit load, t2For the (n + 1) th AGC command Pen+1Time of delivery, PenFor the nth AGC command, Pn、Pn+1Is the step length;
and the AGC commands include a first AGC command, a second AGC command and a third AGC command, and
under the first AGC instruction, Pn、Pn+1Of opposite sign, and Δ t>0；
Under the second AGC instruction, Pn、Pn+1Opposite sign, and Δ t ═ 0;
under the third AGC instruction, Pn、Pn+1Of opposite sign, and Δ t<0。
Preferably, if the (n + 1) th AGC command Pen+1When issuing, the unit load sets SP and PenIf there is also a difference Δ P, then Δ t ═ t2-t1Δ P/v, where v is the load factor.
Preferably, the triggering the frequency modulation mode based on the AGC instruction includes:
when T is greater than 0, under the second AGC instruction or the third AGC instruction, the frequency modulation mode can be triggered;
when T is equal to 0, under a second AGC instruction or a third AGC instruction, triggering a frequency modulation mode, and under the first AGC instruction, not triggering the frequency modulation mode;
and when T <0, the frequency modulation mode is not triggered under the second AGC instruction or the third AGC instruction.
Preferably, when T >0, under the first AGC instruction and Δ T < T is satisfied, the frequency modulation mode may be triggered;
preferably, when T <0, the frequency modulation mode may be triggered under the first AGC instruction and Δ T < T is satisfied.
Compared with the prior art, the invention has the beneficial technical effects that: the frequency mode judging method of the invention judges the AGC instruction reversal through the product of the adjacent secondary AGC step length as negative; when the AGC instruction is reversed, the load setting SP cannot keep up with the AGC instruction, T1 is found out through linear extrapolation of the variable load rate v and is compared with delta T through setting threshold time T, whether the AGC instruction changes frequently is further judged, after the frequency modulation mode is triggered, if the AGC instruction is not triggered again within T1 time, the frequency modulation mode is exited, the loop can be continuously put into use, and the automatic reset function is also realized. The frequency mode judging method can adjust the trigger threshold, screen the required instruction change section, select the proper reset threshold and exit the frequency modulation mode in time, thereby avoiding the difficulty of unit load tracking.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic view of the load trend of the time group with Δ t > 0;
fig. 2 is a schematic view of the group load trend at the time when Δ t is 0;
fig. 3 is a diagram illustrating the load trend of the group at Δ t < 0.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments.
The embodiment provides a method for judging a frequency modulation mode of a unit, which specifically comprises the following steps:
let the nth AGC command be PenStep length of PnNth AGC command PenAfter the order is given, the unit load is set to SP and PenEqual time is t1；
Let the (n + 1) th AGC command be Pen+1Step length Pn+1N +1 th AGC command Pen+1The downward time is t2The time difference between the two is t ═ t2-t1；
If the (n + 1) th AGC command Pen+1When issuing, the unit load sets SP and PenIf there is also a difference Δ P, linear extrapolation is performed according to the current load factor v to obtain t1At this time t1Greater than t2。Δt＝t2-t1＝ΔP/v<0。
If P isn、Pn+1If the signs are opposite, the AGC commands are opposite; according to the load instruction characteristics after bid winning in the group machine, the load instruction with frequent reverse change can be divided into the following 3 cases, as shown in fig. 1-3:
Pn、Pn+1of opposite sign,. DELTA.t>0。
Pn、Pn+1In the opposite sign, Δ t is 0.
Pn、Pn+1Of opposite sign,. DELTA.t<0。
According to the operation characteristics after winning the bid in the unit, when Pn、Pn+1When the signs are opposite, a time threshold T can be set, and when delta T is opposite<And T, the load instruction changes very frequently, namely, the frequency modulation mode can be triggered.
The case of Δ T < T in fig. 1, fig. 2 and fig. 3 may trigger a frequency modulation mode when T > 0;
when T is 0, fig. 2 and 3 may trigger the fm mode, which is not the case in fig. 1;
when T <0, the case of Δ T < T in fig. 3 may trigger fm mode, and fig. 1 and 2 will not trigger fm mode;
the frequency modulation mode determination method of the present embodiment changes the sensitivity of the frequency modulation mode identification method by setting the size of T. The larger T is, the easier the frequency modulation mode is triggered; the smaller T is, the harder it is to trigger the fm mode. And when the frequency modulation mode is triggered and the trigger signal is not received again after T1 seconds, exiting the frequency modulation mode.
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A method for judging a frequency modulation mode of a unit is characterized by comprising the following steps: when P is presentn、Pn+1Opposite sign and Δ t<When T is reached, triggering a frequency modulation mode based on an AGC instruction; where, t is2-t1，T is a predetermined time threshold, T1Is SP and PenAt equal times, SP is set for the unit load, t2For the (n + 1) th AGC command Pen+1Time of delivery, PenFor the nth AGC command, Pn、Pn+1Is the step length;
and the AGC commands include a first AGC command, a second AGC command and a third AGC command, and
under the first AGC instruction, Pn、Pn+1Of opposite sign, and Δ t>0；
Under the second AGC instruction, Pn、Pn+1Opposite sign, and Δ t ═ 0;
under the third AGC instruction, Pn、Pn+1Of opposite sign, and Δ t<0。
2. A unit frequency modulation mode decision method according to claim 1, characterized in that if the (n + 1) th AGC command Pen+1When issuing, the unit load sets SP and PenIf there is also a difference Δ P, then Δ t ═ t2-t1Δ P/v, where v is the load factor.
3. The method for determining a unit frequency modulation mode according to claim 2, wherein the triggering a frequency modulation mode based on an AGC command comprises:
when T is greater than 0, under the second AGC instruction or the third AGC instruction, the frequency modulation mode can be triggered;
when T is equal to 0, under a second AGC instruction or a third AGC instruction, triggering a frequency modulation mode, and under the first AGC instruction, not triggering the frequency modulation mode;
and when T <0, the frequency modulation mode is not triggered under the second AGC instruction or the third AGC instruction.
4. A method for determining a unit frequency modulation mode according to claim 3, wherein when T >0, the frequency modulation mode is triggered under the first AGC command and Δ T < T is satisfied.
5. A method for determining a frequency modulation mode of a unit according to claim 3, wherein when T <0, the frequency modulation mode is triggered under the first AGC command and Δ T < T is satisfied.
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| CN202110694396.4A CN113364010B (en) | 2021-06-22 | 2021-06-22 | Unit frequency modulation mode judgment method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012156989A (en) * | 2011-01-07 | 2012-08-16 | Alps Electric Co Ltd | Broadcast receiver |
| CN109921438A (en) * | 2019-03-13 | 2019-06-21 | 国网山东省电力公司电力科学研究院 | The primary frequency modulation dynamic adjusting method and device that meter and AGC are reversely adjusted |
| JP2019115249A (en) * | 2017-12-25 | 2019-07-11 | 赫普科技発展（北京）有限公司 | Method, apparatus, and system for frequency modulation in power grid |
| CN111082438A (en) * | 2020-01-03 | 2020-04-28 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Control method for locking AGC instruction by priority primary frequency modulation function |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012156989A (en) * | 2011-01-07 | 2012-08-16 | Alps Electric Co Ltd | Broadcast receiver |
| JP2019115249A (en) * | 2017-12-25 | 2019-07-11 | 赫普科技発展（北京）有限公司 | Method, apparatus, and system for frequency modulation in power grid |
| CN109921438A (en) * | 2019-03-13 | 2019-06-21 | 国网山东省电力公司电力科学研究院 | The primary frequency modulation dynamic adjusting method and device that meter and AGC are reversely adjusted |
| CN111082438A (en) * | 2020-01-03 | 2020-04-28 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Control method for locking AGC instruction by priority primary frequency modulation function |
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