CN108561194B - Primary frequency modulation control device and method for generator set - Google Patents
Primary frequency modulation control device and method for generator set Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
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Abstract
The embodiment of the invention provides a primary frequency modulation control device and method for a generator set, and belongs to the technical field of power generation. Generating set primary control device includes: the detection unit is used for detecting whether a power grid frequency sudden change working condition exists in the generator set, wherein the power grid frequency sudden change working condition indicates that the power grid frequency is suddenly changed from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value, and/or is suddenly changed from the second frequency to the first frequency; and the primary frequency modulation unit is used for enhancing the action intensity of primary frequency modulation when the condition that the power grid frequency sudden change exists is detected. Therefore, the problem that the frequency of the power grid is insufficient under the condition that the frequency suddenly changes from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value and/or from the second frequency to the first frequency under the condition that the frequency suddenly changes is solved, and the stable operation of the power grid is guaranteed.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a primary frequency modulation control device and method for a generator set.
Background
With the increasing proportion of large-capacity units in the power grid and the improvement of the requirement of users on the quality of electric energy, the frequency stability of the power grid becomes more and more important. The fault tripping of the large-capacity unit can generate huge impact on the frequency of a power grid, and the hysteresis of a power grid dispatching system and automatic power generation control and regulation cannot meet the requirement of stable operation of the power grid. The effective input of the primary frequency modulation function of the grid-connected unit can fully make up the deficiency.
Primary Frequency Modulation (PFR) is the inherent capability of the Frequency characteristics of the speed control system of a generator set, and changes the steam inlet amount of a turbonator with the Frequency change, and adjusts the Frequency of a power grid by increasing or decreasing the output power of the generator.
The national standard power grid frequency is 50HZ (the corresponding gas turbine rotating speed is +/-3000 rpm and is/min), if the system frequency variation exceeds the dead zone range (for example, the deviation is +/-0.033 HZ, and the corresponding rotating speed is +/-2 rpm), the gas turbine speed regulating system automatically changes the opening of a gas inlet regulating valve of a gas turbine so as to change the gas inlet quantity, increase and decrease the output power of a generator, and finally the power grid frequency is pulled back to the dead zone range to ensure the power grid frequency quality.
In the prior art, as shown in fig. 1A and 1B, for example, the rotational speed unequal rate of a 1000MW generator set is set to be 5%, the load regulation amplitude range is maximum ± 60MW, and at present, a primary frequency modulation control method based on the frequency difference of a power grid is generally used. Specifically, when it is detected that the grid frequency exceeds a dead zone value (frequency corresponding to 2998rpm, frequency corresponding to 3002 rpm), the turbine adjusts the turbine governor according to a grid frequency difference query setting curve, where the larger the frequency difference is, the stronger the adjustment amplitude is, for example: assuming that the grid frequency is in the dead band range before and then drops to a frequency corresponding to 2997rpm, according to the curve, the frequency modulation load is 6.7MW, and the generator output theoretically needs to be increased by about 6.7MW in order to reset the grid frequency back to the dead band range.
However, the inventor of the present application finds that the above solution of the prior art has at least the following disadvantages in the process of practicing the present invention: if the grid frequency drops rapidly from a value exceeding the upper dead band (for example, a frequency corresponding to 3003 rpm) to a value lower than the lower dead band (for example, a frequency corresponding to 2997 rpm), which generally occurs when a plurality of units are disconnected on the grid or under other operating conditions, the theoretical regulation amplitude is still 6.7MW corresponding to 2997rpm by using the prior art. Under such conditions, on the one hand, the contribution rate (the ratio of the actual integrated electric quantity to the theoretical integrated electric quantity) is mostly not satisfactory, and on the other hand, the adjustment process is relatively delayed.
Disclosure of Invention
The embodiment of the invention aims to provide a primary frequency modulation control device and method for a generator set, which are used for at least solving the problem that primary frequency modulation fails under the working condition that the power grid frequency suddenly changes from an upper limit dead zone to an upper limit dead zone in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a primary frequency modulation control apparatus for a generator set, including: the detection unit is used for detecting whether a power grid frequency sudden change working condition exists in the generator set, wherein the power grid frequency sudden change working condition indicates that the power grid frequency is suddenly changed from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value, and/or is suddenly changed from the second frequency to the first frequency; and the primary frequency modulation unit is used for enhancing the action intensity of primary frequency modulation when the condition that the power grid frequency sudden change exists is detected.
Optionally, the detection unit is configured to perform the following operations: detecting the power grid frequency of the generator set; when the power grid frequency is the first frequency, detecting whether the power grid frequency of the generator set changes to the second frequency suddenly within a preset delay time period, or when the power grid frequency is the second frequency, detecting whether the power grid frequency of the generator set changes to the first frequency suddenly within the delay time period; and if the sudden change exists in the delay time period, determining that the power grid frequency sudden change working condition exists.
Optionally, the detecting unit includes: the first upper limit comparison module is used for comparing the power grid frequency of the generator set with the upper limit dead zone value and outputting a high level when the power grid frequency of the generator set exceeds the upper limit dead zone value; the first delay module is used for prolonging the time of the first upper limit comparison module in a high level state; the first lower limit comparison module is used for comparing the power grid frequency of the generator set with the lower limit dead zone value and outputting a high level when the power grid frequency of the generator set is lower than the lower limit dead zone value; and the first sum operation module is used for generating a high level signal to determine that the power grid frequency sudden change working condition exists in the generator set when the first upper limit comparison module and the first lower limit comparison module simultaneously output high levels.
Optionally, the detecting unit includes: the second lower limit comparison module is used for comparing the power grid frequency of the generator set with the lower limit dead zone value and outputting a high level when the power grid frequency of the generator set is lower than the lower limit dead zone value; the second delay module is used for prolonging the time of the second lower limit comparison module in a high level state; the second upper limit comparison module is used for comparing the power grid frequency of the generator set with the upper limit dead zone value and outputting a high level when the power grid frequency of the generator set exceeds the upper limit dead zone value; and the second sum operation module is used for generating a high level signal to determine that the power grid frequency sudden change working condition exists in the generator set when the second lower limit comparison module and the second upper limit comparison module simultaneously output high levels.
Optionally, the detecting unit further includes: the OR operation module is connected to the first and operation module and the second and operation module and used for generating a high-level signal to determine that the power grid frequency sudden change working condition exists in the generator set when the first and operation module or the second and operation module outputs a high level.
Optionally, the detection unit is configured to perform the following operations: detecting the power grid frequency of the generator set; detecting a rate of change with respect to the grid frequency when the grid frequency is the first frequency or the second frequency; and if the detected change rate exceeds a preset threshold value, determining that the power grid frequency sudden change working condition exists.
Optionally, the primary frequency modulation unit includes: and the multiplication operation module is used for multiplying and expanding the frequency modulation amplitude corresponding to the primary frequency modulation of the generator set when the power grid frequency sudden change working condition is detected.
Another aspect of the embodiments of the present invention provides a method for controlling a primary frequency modulation of a generator set, including: detecting whether a power grid frequency sudden change working condition exists in the generator set, wherein the power grid frequency sudden change working condition is used for indicating that the power grid frequency is suddenly changed from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value and/or from the second frequency to the first frequency; and when the condition that the power grid frequency sudden change exists is detected, the action intensity of primary frequency modulation is enhanced.
Optionally, the detecting whether the power grid frequency sudden change working condition exists in the generator set includes: detecting the power grid frequency of the generator set; when the power grid frequency is the first frequency, detecting whether the power grid frequency of the generator set changes to the second frequency within a preset delay time period, and/or when the power grid frequency is the second frequency, detecting whether the power grid frequency of the generator set changes to the first frequency within the delay time period; and if the sudden change exists in the delay time period, determining that the power grid frequency sudden change working condition exists.
Optionally, the detecting whether the power grid frequency sudden change working condition exists in the generator set includes: detecting the power grid frequency of the generator set; detecting a rate of change with respect to the grid frequency when the grid frequency is the first frequency or the second frequency; and if the detected change rate exceeds a preset threshold value, determining that the power grid frequency sudden change working condition exists.
Through the technical scheme, whether a frequency sudden change working condition that the power grid frequency is suddenly changed from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value and/or from the second frequency to the first frequency exists is detected, and the action intensity of primary frequency modulation is enhanced when the power grid frequency sudden change working condition is determined to exist. Therefore, the problem of insufficient primary frequency modulation under the frequency mutation working condition can be effectively solved, and the stable operation of the power grid is guaranteed.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1A is a graph of primary frequency modulation frequency versus load for a 1000MW unit;
FIG. 1B is an example of a prior art primary frequency modulation load adjustment;
fig. 2 is a block diagram of a primary frequency modulation control device of a generator set according to an embodiment of the present invention;
fig. 3 is a block diagram showing a configuration of a detection unit in the primary frequency modulation control apparatus of the generator set shown in fig. 1;
fig. 4 is a block diagram showing a configuration of a detection unit in the primary frequency modulation control apparatus of the generator set shown in fig. 1;
fig. 5 is a schematic connection diagram of a primary frequency modulation control device of a generator set according to an embodiment of the invention;
fig. 6 is a flowchart of a primary frequency modulation control method of a generator set according to an embodiment of the present invention.
Description of the reference numerals
10 primary frequency modulation control device 101 detection unit
102 first upper limit comparison module of primary frequency modulation unit 1011
1012 a first delay module 1013 a first lower bound comparison module
1014 first sum operation module 1015 second lower limit comparison module
1016 second delay block 1017 second upper limit comparison block
1018 second sum operation block 1019 or operation block
1022 analog quantity selection switching module 1021 multiplication operation module
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 2, a primary frequency modulation control apparatus 10 of a generator set according to an embodiment of the present invention includes a detection unit 101 and a primary frequency modulation unit 102, where the detection unit 101 detects whether there is a sudden grid frequency change condition of the generator set, where the sudden grid frequency change condition indicates that a grid frequency suddenly changes from a first frequency exceeding an upper dead zone value to a second frequency lower than a lower dead zone value, and/or from the second frequency to the first frequency. And, the primary frequency modulation unit 102 may strengthen the action strength of the primary frequency modulation when the detection unit 101 detects that the grid frequency abrupt change condition exists. Therefore, the defect that when the power grid frequency suddenly changes from the over-upper limit dead zone to the over-lower limit dead zone, the inherent primary frequency modulation function of the generator set is insufficient is overcome, and the safety and reliability of the operation of the generator set are guaranteed.
More specifically, the detection unit 101 may first detect the grid frequency of the generator set, and when the grid frequency is a first frequency (e.g., a frequency corresponding to 3010 rpm) that exceeds an upper dead zone value (e.g., a frequency corresponding to 3002 rpm), detect whether there is a second frequency (e.g., a frequency corresponding to 2988 rpm) where the grid frequency of the generator set suddenly changes to be less than a lower dead zone value (e.g., a frequency corresponding to 2998 rpm) within a predetermined delay time period (e.g., 5 s), and if so, may determine that there is a grid frequency sudden change condition; and/or the detecting unit 101 may detect whether there is a first frequency, in which the grid frequency of the generator set changes to be greater than the upper limit dead zone value within the delay time period, when the grid frequency is a second frequency less than the lower limit dead zone value, and if so, may determine that there is a grid frequency sudden change condition.
On the other hand, as shown in fig. 3, the detecting unit 101 according to an embodiment of the present invention includes a first upper limit comparing module 1011, a first delay module 1012, a first lower limit comparing module 1013, and a first sum calculating module 1014. The first upper limit comparison module 1011 may compare the power grid frequency of the generator set with an upper limit dead zone value, and output a high level when the power grid frequency of the generator set exceeds the upper limit dead zone value; the first delay module 1012 may prolong the time that the first upper limit comparing module 1011 is in the high state; the first lower limit comparing module 1013 may compare the power grid frequency of the generator set with a lower limit dead zone value, and output a high level when the power grid frequency of the generator set is lower than the lower limit dead zone value; and the first sum operation module is used for generating a high-level signal to determine that the power grid frequency sudden change working condition exists in the generator set when the first upper limit comparison module 1011 and the first lower limit comparison module 1013 output high levels at the same time. In other words, because the existence of the first delay module prolongs the time length for the first upper limit comparison module to output the high level, if the first lower limit comparison module outputs the high level in the prolonged time period, the condition that the power grid frequency sudden change exists can be determined.
On the other hand, as shown in fig. 4, the detecting unit 101 according to another embodiment of the present invention includes a second lower limit comparing module 1015, a second delay module 1016, a second upper limit comparing module 1017, and a second sum computing module 1018. The second lower limit comparing module 1015 may compare the power grid frequency of the generator set with the lower limit dead zone value, and output a high level when the power grid frequency of the generator set is lower than the lower limit dead zone value; the second delay module 1016 may extend the time that the second lower limit comparing module is in the high state; the second upper limit comparing module 1017 may compare the grid frequency of the generator set with the upper limit dead zone value, and output a high level when the grid frequency of the generator set exceeds the upper limit dead zone value; the second sum operation module 1018 may generate a high level signal to determine that the power generator set has the grid frequency sudden change condition when the second lower limit comparison module and the second upper limit comparison module output a high level at the same time. In other words, because the existence of the second delay module prolongs the time length for the second lower limit comparison module to output the high level, if the second upper limit comparison module outputs the high level in the prolonged time period, the condition that the power grid frequency sudden change exists can be determined.
It should be noted that, the module structures and the detection principles of the two aspects of the detection unit described above do not conflict with each other and may exist independently, but may also be integrated together, and both belong to the protection scope of the embodiment of the present invention.
As shown in fig. 5, the primary frequency modulation control apparatus 10 of the generator set according to an embodiment of the present invention includes a detection unit 101 and a primary frequency modulation unit 102, wherein the detection unit 101 includes not only a first upper limit comparison module 1011, a first delay module 1012 (denoted as TOF in the drawing), a first lower limit comparison module 1013, and a first sum operation module 1014, but also a second lower limit comparison module 1015, a second delay module 1016, a second upper limit comparison module 1017, and a second sum operation module 1018, and further includes an or operation module 1019 connected to the first sum operation module 1014 and the second sum operation module 1018. Therefore, on the one hand, when the first sum operation module 1018 generates the high level, the or operation module 1019 can generate the high level accordingly to detect a special working condition that the grid frequency suddenly changes from the upper limit dead zone to the upper limit dead zone, for example, the grid frequency originally exceeds the frequency corresponding to the upper limit dead zone value 3002rpm and suddenly drops to a frequency corresponding to the lower limit dead zone value 2998rpm within the delay time, so that the output of the or operation module 1019 is the high level 1 within the delay time; on the other hand, when the second sum operation module 1018 generates the high level, the or operation module 1019 can generate the high level accordingly, and can also detect a special condition that the grid frequency suddenly changes from the over-lower dead zone to the over-upper dead zone, for example, the grid frequency is originally lower than the frequency corresponding to the lower dead zone value 2998rpm, and suddenly exceeds the frequency corresponding to the upper dead zone value 3002rpm in the delay time, so that the or operation module 1019 outputs the high level 1 in the delay time.
Specifically, the primary frequency modulation unit 102 includes a multiplication module 1021 and an analog quantity selection switching module 1022, wherein when the level of the SE L port of the input analog quantity selection switching module 1022 is a high level, a value k2 of the port 1 is selected as an output, otherwise a value k1 at the port 1 is selected as an output, where k2 > k1, and k1 may be a frequency modulation amplitude corresponding to an original normal operating condition, i.e., a frequency modulation amplitude inherent to the generator set.
It should be noted that the detection manner of the above detection unit 101 for detecting the abrupt change condition may be various, and should not be limited to the above embodiment. As an example, the detecting unit 101 may also detect the grid frequency of the generator set first, and detect a change rate of the grid frequency when the grid frequency is a frequency corresponding to the over-limit dead zone or the over-limit dead zone, and determine that the grid frequency sudden change condition exists if the detected change rate exceeds a predetermined threshold.
As shown in fig. 6, a method for controlling primary frequency modulation of a generator set according to an embodiment of the present invention includes:
s601, detecting whether a power grid frequency sudden change working condition exists in the generator set, wherein the power grid frequency sudden change working condition is used for indicating that the power grid frequency is suddenly changed from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value, and/or is suddenly changed from the second frequency to the first frequency.
And S602, when the power grid frequency sudden change working condition is detected, the action intensity of primary frequency modulation is strengthened.
In some embodiments, the detecting whether the grid frequency sudden change condition exists in the generator set comprises: detecting the power grid frequency of the generator set; when the power grid frequency is the first frequency, detecting whether the power grid frequency of the generator set changes to the second frequency within a preset delay time period, and/or when the power grid frequency is the second frequency, detecting whether the power grid frequency of the generator set changes to the first frequency within the delay time period; and if the sudden change exists in the delay time period, determining that the power grid frequency sudden change working condition exists.
In some embodiments, the detecting whether the grid frequency sudden change condition exists in the generator set comprises: detecting the power grid frequency of the generator set; detecting a rate of change with respect to the grid frequency when the grid frequency is the first frequency or the second frequency; and if the detected change rate exceeds a preset threshold value, determining that the power grid frequency sudden change working condition exists.
For more specific details and effects of the primary frequency modulation control method for the generator set provided by the embodiment of the present invention, reference may be made to the above description of the primary frequency modulation control device for the generator set, and details are not repeated here.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A generating set primary frequency modulation control device comprises:
the detection unit is used for detecting whether a power grid frequency sudden change working condition exists in the generator set, wherein the power grid frequency sudden change working condition indicates that the power grid frequency is suddenly changed from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value within a preset delay time period, and/or is suddenly changed from the second frequency to the first frequency;
the primary frequency modulation unit is used for enhancing the action intensity of primary frequency modulation relative to the non-abrupt working condition of the power grid frequency when the power grid frequency abrupt change working condition is detected; wherein the non-abrupt working condition of the grid frequency indicates that the grid frequency abruptly changes from a dead zone range to a first frequency exceeding an upper dead zone value or a second frequency lower than a lower dead zone value;
the primary frequency modulation unit comprises a multiplication operation module and an analog quantity selection switching module, wherein the multiplication operation module is used for multiplying and expanding the frequency modulation amplitude corresponding to the primary frequency modulation of the generator set when the power grid frequency mutation working condition is detected; and the analog quantity selection switching module is used for outputting the expanded frequency modulation amplitude corresponding to the primary frequency modulation of the generator set when the power grid frequency is subjected to sudden change working condition.
2. The apparatus of claim 1, wherein the detection unit is configured to:
detecting the power grid frequency of the generator set;
when the power grid frequency is the first frequency, whether the power grid frequency of the generator set changes to the second frequency in the delay time period or not is detected, and/or
When the power grid frequency is the second frequency, detecting whether the power grid frequency of the generator set is suddenly changed into the first frequency in the delay time period; and
and if the sudden change exists in the delay time period, determining that the sudden change working condition of the power grid frequency exists.
3. The apparatus of claim 2, wherein the detection unit comprises:
the first upper limit comparison module is used for comparing the power grid frequency of the generator set with the upper limit dead zone value and outputting a high level when the power grid frequency of the generator set exceeds the upper limit dead zone value;
the first delay module is used for prolonging the time of the first upper limit comparison module in a high level state;
the first lower limit comparison module is used for comparing the power grid frequency of the generator set with the lower limit dead zone value and outputting a high level when the power grid frequency of the generator set is lower than the lower limit dead zone value;
and the first sum operation module is used for generating a high level signal to determine that the power grid frequency sudden change working condition exists in the generator set when the first upper limit comparison module and the first lower limit comparison module simultaneously output high levels.
4. The apparatus of claim 3, wherein the detection unit comprises:
the second lower limit comparison module is used for comparing the power grid frequency of the generator set with the lower limit dead zone value and outputting a high level when the power grid frequency of the generator set is lower than the lower limit dead zone value;
the second delay module is used for prolonging the time of the second lower limit comparison module in a high level state;
the second upper limit comparison module is used for comparing the power grid frequency of the generator set with the upper limit dead zone value and outputting a high level when the power grid frequency of the generator set exceeds the upper limit dead zone value;
and the second sum operation module is used for generating a high level signal to determine that the power grid frequency sudden change working condition exists in the generator set when the second lower limit comparison module and the second upper limit comparison module simultaneously output high levels.
5. The apparatus of claim 4, wherein the detection unit further comprises:
the OR operation module is connected to the first and operation module and the second and operation module and used for generating a high-level signal to determine that the power grid frequency sudden change working condition exists in the generator set when the first and operation module or the second and operation module outputs a high level.
6. The apparatus of claim 1, wherein the detection unit is configured to:
detecting the power grid frequency of the generator set;
detecting a rate of change with respect to the grid frequency when the grid frequency is the first frequency or the second frequency; and
and if the detected change rate exceeds a preset threshold value, determining that the sudden change working condition of the power grid frequency exists.
7. A primary frequency modulation control method of a generator set comprises the following steps:
detecting whether a power grid frequency sudden change working condition exists in the generator set, wherein the power grid frequency sudden change working condition is used for indicating that the power grid frequency is suddenly changed from a first frequency exceeding an upper limit dead zone value to a second frequency lower than a lower limit dead zone value within a preset delay time period, and/or is suddenly changed from the second frequency to the first frequency;
when the power grid frequency sudden change working condition is detected, the action intensity of primary frequency modulation is enhanced relative to the non-sudden change working condition of the power grid frequency; wherein the non-abrupt working condition of the grid frequency indicates that the grid frequency abruptly changes from a dead zone range to a first frequency exceeding an upper dead zone value or a second frequency lower than a lower dead zone value;
wherein, the strengthening the action intensity of the primary frequency modulation comprises the following steps: and multiplying and expanding the frequency modulation amplitude corresponding to the primary frequency modulation of the generator set when the condition that the power grid frequency sudden change exists is detected, and outputting the expanded frequency modulation amplitude corresponding to the primary frequency modulation of the generator set.
8. The method of claim 7, wherein detecting whether the grid frequency sudden change condition exists in the generator set comprises:
detecting the power grid frequency of the generator set;
when the power grid frequency is the first frequency, whether the power grid frequency of the generator set changes to the second frequency in the delay time period or not is detected, and/or
When the power grid frequency is the second frequency, detecting whether the power grid frequency of the generator set is suddenly changed into the first frequency in the delay time period; and
and if the sudden change exists in the delay time period, determining that the sudden change working condition of the power grid frequency exists.
9. The method of claim 7, wherein detecting whether the grid frequency sudden change condition exists in the generator set comprises:
detecting the power grid frequency of the generator set;
detecting a rate of change with respect to the grid frequency when the grid frequency is the first frequency or the second frequency; and
and if the detected change rate exceeds a preset threshold value, determining that the sudden change working condition of the power grid frequency exists.
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| EP2015011A1 (en) * | 2007-07-12 | 2009-01-14 | Siemens Aktiengesellschaft | Gas liquefaction facility and method for continuous operation of a gas liquefaction facility |
| CN102709928B (en) * | 2012-05-14 | 2014-12-10 | 南方电网科学研究院有限责任公司 | Emergency frequency modulation control method for micro-grid energy storage system |
| ES2656387T3 (en) * | 2014-07-02 | 2018-02-27 | Vestas Wind Systems A/S | A method for the control of a wind turbine including the inversion of an energy flow through a generator |
| CN105449701B (en) * | 2016-01-18 | 2018-02-16 | 华北电力科学研究院有限责任公司 | A kind of energy-storage system participates in the method and device of mains frequency control |
| CN106571646A (en) * | 2016-09-30 | 2017-04-19 | 深圳市禾望电气股份有限公司 | Dynamic active power frequency modulation method and apparatus of photovoltaic power generation system |
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