CN110021943B - Primary frequency modulation adjusting method based on closed-loop per unit - Google Patents
Primary frequency modulation adjusting method based on closed-loop per unit Download PDFInfo
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- CN110021943B CN110021943B CN201910347794.1A CN201910347794A CN110021943B CN 110021943 B CN110021943 B CN 110021943B CN 201910347794 A CN201910347794 A CN 201910347794A CN 110021943 B CN110021943 B CN 110021943B
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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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention relates to a closed-loop per unit-based primary frequency modulation adjusting method, which comprises the following steps: the CCS system outputs a CCS instruction to the DEH system to control the unit load, and the CCS instruction value is an instruction for real-time closed-loop adjustment of the CCS system according to the unit real-time load; dividing the load of the unit by the CCS instruction, namely, the CCS instruction value corresponding to the 1MW load actually sent by the unit is defined as a one-time frequency modulation per unit coefficient K; and defining the value obtained by correcting the frequency difference function F (x) by using the primary frequency modulation per unit coefficient K as a primary frequency modulation per unit load value, and then superposing the primary frequency modulation per unit load value on the CCS instruction, wherein the primary frequency modulation per unit load value is a real-time closed-loop regulating value, so that the method adapts to different working conditions. The method has simple parameter setting and strong adaptability after parameter setting.
Description
Technical Field
The invention relates to a frequency modulation method, in particular to a primary frequency modulation adjusting method based on closed-loop per unit.
Background
With the increase of the wind power proportion, the deviation value of the grid frequency of the power grid is increased, the optimization of the grid frequency is imperative, the requirement of the power grid on the primary frequency modulation index of the generator set is more and more strict, and the checking strength is continuously increased.
Disclosure of Invention
The invention provides a closed-loop per unit-based primary frequency modulation adjusting method aiming at the problems in the prior art, and solves the problem that the primary frequency modulation is difficult to accurately act through main steam pressure open-loop correction in different working conditions of a unit in the prior art.
The technical scheme of the invention is as follows:
a closed-loop per unit-based primary frequency modulation adjusting method comprises the following steps:
the CCS System outputs a CCS instruction to a DEH System (Digital Electric Hydraulic Control System) to Control the load of the unit, and the CCS instruction value is an instruction of the CCS System for real-time closed-loop adjustment according to the real load of the unit; dividing the load of the unit by the CCS instruction, namely, the CCS instruction value corresponding to the 1MW load actually sent by the unit is defined as a one-time frequency modulation per unit coefficient K; and defining the value obtained by correcting the frequency difference function F (x) by using the primary frequency modulation per unit coefficient K as a primary frequency modulation per unit load value, and then superposing the primary frequency modulation per unit load value on the CCS instruction, wherein the primary frequency modulation per unit load value is a real-time closed-loop regulating value, so that the method adapts to different working conditions.
The working conditions comprise any one of DEH system sequence valve mode operation, DEH system single valve mode operation, DEH system heat supply working conditions and DEH system deep peak regulation working conditions.
The one-time frequency modulation per-unit load value is provided with an advanced loop.
The longest action time of the primary frequency modulation is 60 seconds, the primary frequency modulation is adjustable within 0 to 3 seconds, 3 to 15 seconds, 15 to 45 seconds and 45 to 60 seconds.
The invention has the following advantages and effects:
1. the parameter setting is simple: the frequency difference function is unchanged, the closed loop per unit is unchanged, the parameter default values in the logic setting parameters M2 (1), M5 (1), M7 (1) and M8 (0) are kept unchanged, the '1, 1 and 0' in the brackets are the parameter default values, and the logic setting parameters M1, M3, M4 and M6 only need to be adjusted according to the primary frequency modulation curve of the power grid.
2. After the parameters are set, the adaptability is strong: the method is suitable for a single valve mode, a sequence valve mode, a deep peak regulation working condition and a unit heat supply working condition.
Drawings
Fig. 1 is a block diagram of a main steam pressure open loop correction system in the prior art.
Fig. 2 is a block diagram of a closed-loop per-unit primary frequency modulation adjusting method according to the present invention.
Detailed Description
Examples
In order to evaluate index values B1, B2, B3 and Bu of the standard power grid, M1-M8 are additionally arranged to carry out detailed adjustment on the quality of B1, B2, B3 and Bu.
The frequency of a power grid on a thermal power unit network requires 3000 revolutions per minute and 2 revolutions per minute, when the rotating speed of the unit exceeds 3002 revolutions per minute, the load of each increased unit is reduced by 2MW (300 MW)/4 MW (600 MW) and is reduced by 24MW/36MW at most; when the unit rotating speed is lower than 2998 rpm, the unit load is increased by 2MW (300 MW)/4 MW (600 MW) per reduced one-revolution unit, and the maximum load is increased by 24MW/36MW. When the rotating speed value of the unit is not in the dead zone range, the longest duration of 1 minute is a primary frequency modulation assessment range, and assessment indexes B1, B2, B3 and Bu have the following meanings:
the primary frequency modulation action is qualified once, namely four indexes of B1, B2, B3 and Bu are qualified:
b1=1, namely, the response of primary frequency modulation within 3 seconds, the B1 index is qualified, B1=0, namely, the response of primary frequency modulation within 3 seconds is not realized, and the B1 index is unqualified;
b2 is more than 90 percent (usually 90 to 200 percent), namely when the primary frequency modulation action is carried out for 15 seconds, the response value of the primary frequency modulation load reaches 90 percent of the theoretical load value of the primary frequency modulation, the B2 index is qualified, otherwise, the B2 index is unqualified;
b3 is less than 25% (usually 0-25%), namely when the primary frequency modulation action is 60 seconds, the primary frequency modulation load response value is between 75% and 125% of the primary frequency modulation theoretical load value, the B3 index is qualified, otherwise the B3 index is unqualified;
bu is more than 80% (usually 80-200%), namely within 60 seconds of primary frequency modulation action, the integral area of the primary frequency modulation load response value is more than 80% of the integral area of the primary frequency modulation theoretical load value, the Bu index is qualified, otherwise, the Bu index is unqualified.
The daily average qualification or the monthly average qualification of the primary frequency modulation is as follows:
b1 is greater than 0.5 (usually 0.5-1), B1 index is qualified, namely within 3 seconds of primary frequency modulation action, the primary frequency modulation response times reach more than half;
b2 is more than 90 percent (usually 90 to 200 percent), the B2 index is qualified, namely the average primary frequency modulation load response value reaches 90 percent of the theoretical load value of the primary frequency modulation when the primary frequency modulation acts for 15 seconds;
b3 is less than 30% (usually 0-30%), B3 index is qualified, namely when the primary frequency modulation action is 60 seconds, the average primary frequency modulation load response value is between 70% and 130% of the theoretical load value of the primary frequency modulation;
bu is more than 80% (usually 80-200%), the Bu index is qualified, namely within 60 seconds of primary frequency modulation action, the integral area of the average primary frequency modulation load response value is more than 80% of the integral area of the theoretical load value of the primary frequency modulation.
In order to adapt to the assessment index of the power grid, logic setting parameters M1, M2-M8 are added in the closed-loop per-unit primary frequency modulation adjusting scheme for local adjustment. The logic setting parameters M1, M3, M5 and M7 are multiplied 3 seconds before the primary frequency modulation action, and the multiplication is simplified into the multiplication of the parameters M1 and M3 after the corresponding parameter B1 is set to be 1 before 45 seconds and 60 seconds, and corresponds to B1; multiplying the parameters M2, M3, M5 and M7 when the time is 3-15 seconds, and simplifying the parameters M2, M5 and M7 into M3 corresponding to the parameter B2 after the corresponding parameters B2, M5 and M7 are constantly set to 1; similarly, when the time is 15 seconds to 45 seconds, M4 corresponds to the parameter Bu; when 45 seconds to 60 seconds, M4 and M6 are multiplied by each other, and the parameter B3 is associated therewith. And in the secondary frequency modulation time (after the primary frequency modulation continuously acts for 60 seconds), as M8 is always set to be 0, the per-unit load value of the primary frequency modulation is 0, so that the load value of the unit is closer to the AGC load value, and the AGC tracking index is further optimized.
When optimizing the B1, B2, B3, bu indexes, the logical parameters M1, M3, M4, M6 are adjusted with reference to table 1.
The invention relates to a closed-loop per unit-based primary frequency modulation adjusting method, which specifically comprises the following steps of:
step 1, the frequency difference broken line function is unchanged, and the load values corresponding to the rotating speeds and the frequency differences of the 300MW and 600MW units are shown in a table 2.
And 2, the closed-loop per-unit is unchanged, and the real-time CCS instruction is divided by the real-time load of the unit, namely the CCS instruction value corresponding to the unit real-time 1MW load is defined as the logic of the one-time frequency modulation per-unit coefficient K is kept unchanged.
And 3, keeping the default values of M2 (default value 1), M5 (default value 1), M7 (default value 1) and M8 (default value 0), and keeping the logic setting parameters unchanged.
Step 4, setting the lead time of the primary frequency modulation per unit load value lead loop according to the lag time of the primary frequency modulation response curve, for example, on a time axis, the time of the primary frequency modulation response curve lagging the primary frequency modulation theoretical curve is 2 seconds, and the lead time of the lead loop is set to be 2 seconds; for example, if the time of the primary response curve lagging the primary theoretical curve on the time axis is 3 seconds, the lead time of the lead loop is set to 3 seconds, and so on.
Step 5, observing the daily average value or the monthly average value of the primary frequency modulation assessment indexes of the power grid, and adjusting logic setting parameters M1, M3, M4 and M6; and (3) observing a primary frequency modulation response curve in the following step 5), and repeatedly adjusting until the power grid assessment indexes B1, B2, B3 and Bu are qualified.
1) B1 is required to be more than 0.5, namely within 3 seconds, the requirement of primary frequency modulation response is more than half, and if the requirement is not more than 0.5, M1 is increased;
2) B2 is required to be more than 90 percent, namely 15 seconds, the average primary frequency modulation load response value reaches 90 percent of the theoretical load value of the primary frequency modulation when the primary frequency modulation acts for 15 seconds, and if the response value is less than 90 percent, M2 is increased; if greater than 90%, M2 should be decreased while keeping M1 × M3 unchanged;
3) And B3 is required to be less than 30%, namely 60 seconds, the average primary frequency modulation load response value is 70% to 130% of the theoretical load value of the primary frequency modulation, and the adjustment M6 of the primary frequency modulation curve is observed, because the steady state deviation is more than 30% probably because the response value of the primary frequency modulation is more than an ideal value or less than an ideal value, the steady state deviation means that the response value of the primary frequency modulation deviates from the theoretical value of the primary frequency modulation, the primary frequency modulation action curve recorded by the power grid is specifically observed in the process of adjusting M6 to meet the condition that B3 is less than 30%, and the increase or decrease of M6 is determined. If the primary frequency modulation response value is larger than the theoretical value, reducing M6; and if the primary frequency modulation response value is smaller than the theoretical value, increasing M6.
4) Bu is required to be more than 80 percent, namely within 60 seconds of primary frequency modulation action, the integral area of the average primary frequency modulation load response value is more than 80 percent of the integral area of the theoretical load value of the primary frequency modulation, and if the integral area is less than 80 percent, M4 is increased; if more than 80% too much, M4 should be reduced while M4 x M6 should be kept constant to ensure that adjusted B3 is not affected.
TABLE 1
TABLE 2
Claims (6)
1. A closed-loop per unit-based primary frequency modulation adjusting method is characterized by comprising the following steps:
the CCS System outputs a CCS instruction to a DEH System (Digital Electric Hydraulic Control System) to Control the load of the unit, and the CCS instruction value is an instruction of real-time closed-loop adjustment of the CCS System according to the real load of the unit; dividing the load of the unit by the CCS instruction, namely, the CCS instruction value corresponding to the 1MW load actually sent by the unit is defined as a one-time frequency modulation per unit coefficient K; and defining the value obtained by correcting the frequency difference function F (x) by using the primary frequency modulation per unit coefficient K as a primary frequency modulation per unit load value, and then superposing the primary frequency modulation per unit load value on the CCS instruction, wherein the primary frequency modulation per unit load value is a real-time closed-loop regulating value, so that the method adapts to different working conditions.
2. A primary frequency modulation adjusting method based on closed-loop per unit as claimed in claim 1, wherein the operating mode includes any one of sequential valve mode operation of DEH system, single valve mode operation of DEH system, heating operating mode of DEH system, and deep peak-shaving operating mode of DEH system.
3. A method according to claim 1, wherein the per-unit load per-frequency-modulation is advanced by a loop, i.e. the lead time of the per-unit load per-frequency-modulation is set according to the lag time of the response curve of the per-frequency-modulation.
4. The closed-loop per unit-based primary frequency modulation adjusting method according to claim 1, wherein the primary frequency modulation is longest in action for 60 seconds, adjustable from 0 to 3 seconds, adjustable from 3 to 15 seconds, adjustable from 15 to 45 seconds, and adjustable from 45 to 60 seconds.
5. The method for primary frequency modulation adjustment based on closed-loop per unit according to claim 1, wherein logic setting parameters M1, M2-M8 are added for local adjustment, the logic setting parameters M1, M3, M5, M7 are multiplied 3 seconds before a primary frequency modulation action, and are simplified into multiplication of parameters M1, M3 corresponding to B1 after the parameters B1, 45 seconds and 1 before 60 seconds are always set, respectively; multiplying the parameters M2, M3, M5 and M7 when the time is 3-15 seconds, and simplifying the parameters M2, M5 and M7 into the parameter B2 corresponding to M3 after the corresponding parameters B2, M5 and M7 are constantly set to 1; similarly, when 15 seconds to 45 seconds exist, M4 corresponds to the parameter Bu; when the time is 45 seconds to 60 seconds, M4 and M6 are multiplied by each other to correspond to the parameter B3.
6. The closed-loop per-unit-based primary frequency modulation adjusting method according to claim 5, wherein a daily average value or a monthly average value of a primary frequency modulation assessment index of a power grid is observed, and logic setting parameters M1, M3, M4 and M6 are adjusted; observing a primary frequency modulation response curve in the following steps 1), 2), 3) and 4), and repeatedly adjusting until power grid assessment indexes B1, B2, B3 and Bu are qualified;
1) B1 requirement is more than 0.5, namely within 3 seconds, the requirement of primary frequency modulation response is more than half, if not
If the value is more than 0.5, M1 should be increased;
2) B2 is required to be more than 90 percent, namely 15 seconds, when the primary frequency modulation action is 15 seconds, the average primary frequency modulation load response value reaches 90 percent of the theoretical load value of the primary frequency modulation, and if the response value is less than 90 percent, M2 is increased; if greater than 90% M2 should be reduced while keeping M1 x M3 unchanged;
3) B3, when B3 is required to be less than 30%, that is, 60 seconds, the average primary frequency modulation load response value is between 70% and 130% of the theoretical load value of the primary frequency modulation, and the adjustment of the primary frequency modulation curve M6 is observed, because the primary frequency modulation response value is greater than the ideal value or less than the ideal value, it is possible to cause a steady state deviation greater than 30%, and the steady state deviation refers to a deviation of the primary frequency modulation response value from the theoretical value of the primary frequency modulation, so that the primary frequency modulation action curve recorded by the power grid is specifically observed in the process of adjusting M6 to satisfy B3 less than 30%, and it is determined to increase or decrease M6, and if the primary frequency modulation response value is greater than the theoretical value, M6 is decreased; if the primary frequency modulation response value is smaller than the theoretical value, increasing M6;
4) Bu is required to be more than 80%, namely within 60 seconds of primary frequency modulation action, the integral area of the average primary frequency modulation load response value is more than 80% of the integral area of the theoretical load value of the primary frequency modulation, and if Bu is less than 80%, M4 is increased; if more than 80% too much, M4 should be reduced while M4 x M6 should be kept constant to ensure that adjusted B3 is not affected.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101515A1 (en) * | 2012-12-24 | 2014-07-03 | 国家电网公司 | Method for designing automatic generation control model under grid connection of intermittent energy |
| CN105391078A (en) * | 2015-11-03 | 2016-03-09 | 中国大唐集团科学技术研究院有限公司华中分公司 | Primary frequency regulation closed loop control method for generator set |
| CN106410857A (en) * | 2016-04-08 | 2017-02-15 | 国网天津市电力公司 | Unit generating set primary frequency modulation function realization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101515A1 (en) * | 2012-12-24 | 2014-07-03 | 国家电网公司 | Method for designing automatic generation control model under grid connection of intermittent energy |
| CN105391078A (en) * | 2015-11-03 | 2016-03-09 | 中国大唐集团科学技术研究院有限公司华中分公司 | Primary frequency regulation closed loop control method for generator set |
| CN106410857A (en) * | 2016-04-08 | 2017-02-15 | 国网天津市电力公司 | Unit generating set primary frequency modulation function realization method |
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