CN110556844A - automatic frequency modulation method for asynchronous transmitting-end power grid - Google Patents
automatic frequency modulation method for asynchronous transmitting-end power grid Download PDFInfo
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Abstract
The embodiment of the application provides an automatic frequency modulation method for an asynchronous transmitting-end power grid, which comprises the following steps: detecting the frequency variation and the frequency variation rate of the power grid system; comparing the frequency variation with a frequency modulation high threshold; if the frequency variation is smaller than the frequency modulation high threshold, obtaining the frequency modulation level of the power grid system in the time dimension according to the frequency variation rate; starting a corresponding frequency modulation domain according to the frequency modulation level; obtaining a frequency modulation object of the power grid system in a frequency modulation domain according to the frequency variation; and starting a frequency modulation object to perform frequency modulation on the power grid system. According to the method and the device, the frequency modulation objects are determined by integrating the time dimension and the object dimension, the step control over the multiple frequency modulation objects is realized, and the mutual interference of the multiple frequency modulation objects is effectively reduced.
Description
Technical Field
The application relates to the technical field of power grid frequency modulation, in particular to an automatic frequency modulation method for an asynchronous transmitting-end power grid.
Background
With the development of power electronic technology, high-voltage direct-current transmission is increasingly applied to power systems, and in addition, the permeability of new energy in a power grid is gradually increased, stable operation of the power system faces many challenges, and poor frequency stability is one of the challenges.
The power system mainly realizes primary adjustment of the power grid frequency through a primary frequency modulation function of the hydroelectric generating set or the thermal power generating set, but the frequency modulation effect of the hydroelectric generating set or the thermal power generating set is gradually weakened along with the increase of the access proportion of new energy and high-voltage direct-current transmission of asynchronous networking.
In the related art, in order to improve the frequency modulation effect of the asynchronous transmission grid, in addition to primary frequency modulation of a hydroelectric power unit or a thermal power unit, new energy frequency modulation and FLC (frequency limiting control) frequency modulation are also performed. However, interaction and mutual influence exist among multiple frequency modulation modes, and the frequency modulation functions are difficult to cooperate with each other, even can be restricted and interfered with each other, so that the overall frequency modulation effect is reduced, and the frequency stability of the power grid is difficult to ensure.
disclosure of Invention
the application provides an automatic frequency modulation method for an asynchronous transmitting-end power grid, which aims to solve the problem that multiple frequency modulation modes of the asynchronous transmitting-end power grid interfere with each other.
The application provides an automatic frequency modulation method for an asynchronous transmitting-end power grid, which comprises the following steps:
detecting the frequency variation and the frequency variation rate of the power grid system;
Comparing the frequency variation with a frequency modulation high threshold;
If the frequency variation is smaller than the frequency modulation high threshold, obtaining the frequency modulation level of the power grid system on the time dimension according to the frequency variation rate;
starting a corresponding frequency modulation domain according to the frequency modulation level;
obtaining a frequency modulation object of the power grid system in the frequency modulation domain according to the frequency variation;
And starting the frequency modulation object to modulate the frequency of the power grid system.
Optionally, obtaining a frequency modulation level of the power grid system in a time dimension according to the frequency change rate includes:
comparing the frequency change rate with a first frequency modulation threshold and a second frequency modulation threshold respectively;
if the frequency change rate is larger than the first frequency modulation threshold value, determining that the frequency modulation level is millisecond level;
If the frequency change rate is smaller than or equal to the first frequency modulation threshold and larger than the second frequency modulation threshold, determining that the frequency modulation level is hundred milliseconds;
and if the frequency change rate is less than or equal to the second frequency modulation threshold value, determining that the frequency modulation level is in the second level.
Optionally, obtaining a frequency modulation object of the power grid system in the frequency modulation domain according to the frequency variation includes:
Comparing the frequency variation with a sixth frequency modulation dead zone, a fifth frequency modulation dead zone, a fourth frequency modulation dead zone and a third frequency modulation dead zone respectively according to the condition that the frequency modulation domain is in millisecond level;
If the frequency variation is larger than the sixth frequency modulation dead zone, all frequency modulation objects of the millisecond level are selected;
If the frequency variation is smaller than or equal to the sixth frequency modulation dead zone and larger than the fifth frequency modulation dead zone, selecting the millisecond-level first frequency modulation object;
If the frequency variation is smaller than or equal to the fifth frequency modulation dead zone and larger than the fourth frequency modulation dead zone, selecting a second frequency modulation object of the millisecond level;
If the frequency variation is smaller than or equal to the fourth frequency modulation dead zone and larger than the third frequency modulation dead zone, selecting a third frequency modulation object of the millisecond level;
comparing the frequency variation with a second frequency modulation dead zone and a first frequency modulation dead zone respectively according to the second level of the frequency modulation domain;
if the frequency variation is larger than the second frequency modulation dead zone, all frequency modulation objects of the second level are selected;
And if the frequency variation is smaller than or equal to the second frequency modulation dead zone and larger than the first frequency modulation dead zone, selecting a fourth frequency modulation object of the millisecond level.
Optionally, the method further comprises:
According to the fact that the frequency modulation domain is in a millisecond level, if the frequency variation is smaller than or equal to the third frequency modulation dead zone, the frequency modulation object in the millisecond level is not started;
And if the frequency variation is smaller than or equal to the first frequency modulation dead zone, not starting the frequency modulation object of the second level.
Optionally, the first frequency modulation object includes an energy storage frequency modulation, a photovoltaic frequency modulation, and a wind power frequency modulation, the second frequency modulation object includes the photovoltaic frequency modulation and the wind power frequency modulation, the third frequency modulation object includes the wind power frequency modulation, the fourth frequency modulation object includes a thermal power frequency modulation, and the millisecond-level frequency modulation object further includes a direct current FLC frequency modulation.
optionally, the frequency modulation high threshold comprises 0.16Hz, the sixth frequency modulation dead zone comprises 0.14Hz, the fifth frequency modulation dead zone comprises 0.1Hz, the fourth frequency modulation dead zone comprises 0.08Hz, the third frequency modulation dead zone comprises 0.06Hz, the second frequency modulation dead zone comprises 0.05Hz, the first frequency modulation dead zone comprises 0.033Hz, the first frequency modulation threshold comprises 0.1Hz/s, and the second frequency modulation threshold comprises 0.05 Hz/s.
optionally, detecting a frequency change amount and a frequency change rate of the power grid system, and the method further includes: and dividing the frequency modulation level of the frequency modulation object according to the response time.
Optionally, the method further comprises:
and if the frequency variation is larger than the frequency modulation high threshold, starting all frequency modulation objects of all frequency modulation levels to modulate the frequency of the power grid system.
The asynchronous sending end power grid automatic frequency modulation method provided by the application has the beneficial effects that:
the automatic frequency modulation method for the asynchronous transmitting-end power grid provided by the embodiment of the application has the following characteristics:
1. The power grid frequency modulation is subjected to architecture design, function positioning and frequency modulation region division from a system level.
2. The method comprises the steps of carrying out frequency modulation interval division on various frequency modulation modes, introducing frequency change rate, realizing response division of different modulation frequency domains, adopting a frequency modulation object with quick response when the frequency change is quick, and adopting a frequency modulation object with slower response when the frequency change is slow. When the frequency changes rapidly, the frequency modulation object with slow response has no time to act, and the spare capacity arrangement is rotated according to different frequency modulation domains so as to reduce the frequency fluctuation amplitude. When the frequency changes slowly, the frequency modulation object with fast response is easy to cause the interleaving action. The frequency modulation domain is divided according to the frequency change rate, so that the division and the positioning of each frequency modulation function are effectively ensured.
3. the functional positioning of different frequency modulation objects is carried out through the frequency modulation dead zone on a specific time frequency modulation level (corresponding to a specific frequency modulation domain), so that the step adjustment of different frequency modulation objects on the frequency modulation domain is realized, and the frequency fluctuation and the frequency oscillation caused by the staggered action of all the frequency modulation objects on the frequency modulation domain are effectively avoided.
4. At a millisecond-level frequency modulation level (corresponding to a millisecond-level frequency modulation domain), a frequency modulation dead zone of new energy (photovoltaic frequency modulation and wind power frequency modulation) is smaller than a frequency modulation dead zone of direct current FLC frequency modulation, DB3 is set to be not less than DB4 and not less than DB5 and not more than DB6, the frequency modulation dead zone of the direct current FLC frequency modulation is larger than other frequency modulation objects, the action frequency of the direct current FLC frequency modulation is effectively reduced, and the power fluctuation of a receiving-end power grid caused by the direct current FLC frequency modulation action of an asynchronous transmitting-end power grid.
5. The frequency modulation level with large response time has a frequency modulation dead zone smaller than that of the frequency modulation level with small response time, so that the fast coarse adjustment of the frequency modulation means with small inertia is realized, the slow fine adjustment of the frequency modulation means with large inertia is realized, the level adjustment of the frequency is realized, and the fast stabilization of the system frequency is facilitated.
6. The frequency modulation method is realized by optimizing the control program and the frequency modulation parameters without adding extra equipment facilities, so that high cost investment caused by transformation is avoided.
7. According to the frequency modulation method and device, the frequency modulation function is planned and organized from the system level, the frequency modulation function is not limited to a single device, the frequency modulation effects of various devices can complement each other, and the system frequency adjustment effect is maximized.
drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic flowchart of an automatic frequency modulation method for an asynchronous transmitting-end power grid according to an embodiment of the present application;
fig. 2 is a schematic diagram of distribution of frequency-modulated objects of an asynchronous transmitting-end power grid according to an embodiment of the present application;
fig. 3 is a schematic diagram of a frequency modulation function logic according to an embodiment of the present disclosure.
Detailed Description
in order to make those skilled in the art better understand the technical solutions in the present application, 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a schematic flow chart of an automatic frequency modulation method for an asynchronous transmitting-end power grid provided in an embodiment of the present application is shown in fig. 1, where the automatic frequency modulation method for the asynchronous transmitting-end power grid provided in the embodiment of the present application includes the following steps:
Step S100: and dividing the frequency modulation level of the frequency modulation object according to the response time.
and carrying out hierarchical setting according to the response time, dividing the hierarchical setting into n frequency modulation levels, and setting the kth level time interval to be [ T k-1, T k ] for the time 0, T 1, T 2.. T k-1 and T k.. T n, wherein the response time is the time required by the frequency modulation object to adjust the frequency to the steady-state frequency.
In the embodiment of the application, the frequency modulation object of the asynchronous transmission end power grid comprises direct current FLC frequency modulation, energy storage frequency modulation, photovoltaic frequency modulation, wind power frequency modulation, thermal power frequency modulation and hydroelectric frequency modulation. According to response time, dividing the frequency modulation objects into 3 different frequency modulation levels, wherein direct current FLC frequency modulation, energy storage frequency modulation, photovoltaic frequency modulation and wind power frequency modulation are divided into millisecond levels, thermal power frequency modulation and hydroelectric frequency modulation are divided into second levels, besides the millisecond levels and the second levels, the frequency modulation levels are also provided with hundred millisecond levels, and the hundred millisecond levels comprise frequency modulation objects formed by variable inertia control and different unit characteristics, such as: wind power and photovoltaic units controlled by variable inertia are adopted to improve the total inertia of the system.
step S110: and detecting the frequency variation quantity and the frequency variation rate of the power grid system.
According to the frequency modulation method and device, the frequency modulation of the power grid system is divided into a time dimension and an object dimension, the time dimension and the object dimension are integrated, and finally the frequency modulation object is determined. In the time dimension, selecting a frequency modulation object with response time meeting the requirement according to the frequency change rate of the power grid system; and in the object dimension, selecting a frequency modulation object with a frequency modulation effect meeting the requirement according to the frequency variation of the power grid system, wherein the frequency variation refers to the difference between the frequency of the power grid system and the power frequency.
step S120: the frequency variation is compared to a frequency modulation high threshold.
the frequency modulation high threshold is a frequency variation reference value of a frequency modulation object selected by the power grid system, and when the frequency variation of the power grid system is higher than the frequency modulation high threshold, the frequency modulation high threshold indicates that the frequency fluctuation of the power grid system is too large, the frequency modulation object does not need to be selected, and all frequency modulation objects are directly started to perform frequency modulation so as to rapidly suppress the frequency fluctuation of the frequency power grid system. In this embodiment, the frequency modulation high threshold may be set to 0.16 Hz.
Step S130: and if the frequency variation is smaller than the frequency modulation high threshold, obtaining the frequency modulation level of the power grid system in the time dimension according to the frequency variation rate.
And comparing the frequency change rate with a first frequency modulation threshold and a second frequency modulation threshold, if the frequency change rate is greater than the first frequency modulation threshold, determining that the frequency modulation level is millisecond level, if the frequency change rate is less than or equal to the first frequency modulation threshold and greater than the second frequency modulation threshold, determining that the frequency modulation level is hundred millisecond level, and if the frequency change rate is less than or equal to the second frequency modulation threshold, determining that the frequency modulation level is second level. In this embodiment, the second frequency modulation threshold may be set to 0.05Hz, and the first frequency modulation threshold may be set to 0.1 Hz.
Step S140: and starting the corresponding frequency modulation domain according to the frequency modulation level.
According to the method, a millisecond-level frequency modulation domain is started according to the fact that a frequency modulation level is a millisecond level, only a frequency modulation object of which the frequency modulation level is the millisecond level is controlled in the millisecond-level frequency modulation domain, only a frequency modulation object of which the frequency modulation level is the hundred millisecond level is controlled in the hundred millisecond-level frequency modulation domain, only a frequency modulation object of which the frequency modulation level is the second level is controlled in the second-level frequency modulation domain, the problem that the frequency modulation effect is poor due to the fact that the frequency modulation object is started and does not accord with the frequency modulation level is avoided, for example, thermal power frequency modulation is started in the millisecond-level frequency modulation domain, the response of the thermal power frequency modulation is slow, the frequency modulation effect cannot be reflected in time, wind power frequency modulation is started in the second-level frequency modulation domain, the wind power frequency modulation response is fast; for example, because of different response times, for the same frequency variation, a power adjustment amount and a wind power and thermal power execution adjustment amount are calculated, and because wind power adjustment is fast, the frequency is pulled into a dead zone in a short time, whereas the thermal power adjustment amount is executed slowly, and after the thermal power adjustment amount is executed, the frequency may be pulled out of the dead zone, and the operations are repeated, so that frequency modulation staggering action and system frequency oscillation are caused.
Step S150: and obtaining a frequency modulation object of the power grid system in the frequency modulation domain according to the frequency variation.
Different frequency modulation dead zones are set for different frequency modulation objects, and the cascade adjustment of different frequency modulation objects on one frequency modulation domain is realized. In the step S100, six frequency modulation dead zones are correspondingly set for the six frequency modulation objects: the frequency modulation device comprises a sixth frequency modulation dead zone, a fifth frequency modulation dead zone, a fourth frequency modulation dead zone, a third frequency modulation dead zone, a second frequency modulation dead zone and a first frequency modulation dead zone.
and comparing the frequency variation with a sixth frequency modulation dead zone, a fifth frequency modulation dead zone, a fourth frequency modulation dead zone and a third frequency modulation dead zone respectively according to the condition that the frequency modulation domain is in millisecond level: if the frequency variation is larger than the sixth frequency modulation dead zone, all frequency modulation objects of millisecond level are selected; if the frequency variation is smaller than or equal to the sixth frequency modulation dead zone and larger than the fifth frequency modulation dead zone, selecting a first frequency modulation object with millisecond level; if the frequency variation is smaller than or equal to the fifth frequency modulation dead zone and larger than the fourth frequency modulation dead zone, selecting a second frequency modulation object with millisecond level; if the frequency variation is smaller than or equal to the fourth frequency modulation dead zone and larger than the third frequency modulation dead zone, selecting a third frequency modulation object with millisecond level; and if the frequency variation is less than or equal to the third frequency modulation dead zone, not starting the frequency modulation object in millisecond level.
And comparing the frequency variation with a second frequency modulation dead zone and a first frequency modulation dead zone respectively according to the condition that the frequency modulation domain is in a second level: if the frequency variation is larger than the second frequency modulation dead zone, all frequency modulation objects of a second level are selected; if the frequency variation is smaller than or equal to the second frequency modulation dead zone and larger than the first frequency modulation dead zone, selecting a fourth frequency modulation object with millisecond level; and if the frequency variation is less than or equal to the first frequency modulation dead zone, not starting the frequency modulation object in the second level.
In the embodiment of the application, the first frequency modulation object comprises an energy storage frequency modulation, a photovoltaic frequency modulation and a wind power frequency modulation, the second frequency modulation object comprises a photovoltaic frequency modulation and a wind power frequency modulation, the third frequency modulation object comprises a wind power frequency modulation, and the fourth frequency modulation object comprises a thermal power frequency modulation. The sixth frequency modulation dead zone comprises 0.14Hz, the fifth frequency modulation dead zone comprises 0.1Hz, the fourth frequency modulation dead zone comprises 0.08Hz, the third frequency modulation dead zone comprises 0.06Hz, the second frequency modulation dead zone comprises 0.05Hz, and the first frequency modulation dead zone comprises 0.033 Hz.
Step S160: and starting a frequency modulation object to perform frequency modulation on the power grid system.
And frequency modulation is carried out on the power grid system according to the frequency modulation object determined in the step S150.
Referring to fig. 2, a schematic diagram of distribution of frequency modulation objects of an asynchronous transmitting-end power grid according to an embodiment of the present application is shown, in fig. 2, an abscissa is a frequency change rate DDB, a DDB1 is a first frequency modulation threshold, a DDB2 is a second frequency modulation threshold, an ordinate is a frequency change amount DB, a DBM is a frequency modulation high threshold, DB1 and DB1 'are first frequency modulation dead zones, DB2 and DB 2' are second frequency modulation dead zones, DB3 and DB3 'are third frequency modulation dead zones, DB4 and DB 4' are fourth frequency modulation dead zones, DB5 and DB5 'are fifth frequency modulation dead zones, and DB6 and DB 6' are sixth frequency modulation dead zones.
MS represents millisecond level, BMS represents hundred millisecond level, S represents second level, RF1 represents direct current FLC frequency modulation, RF2 represents energy storage frequency modulation, RF3 represents photovoltaic frequency modulation, RF4 represents wind power frequency modulation, RF5 represents hydroelectric frequency modulation, and RF6 represents thermal power frequency modulation.
Taking the frequency of the power grid system greater than 50Hz as an example:
When DDB > DDB1 ═ 0.1Hz/s, millisecond-level tone domain is initiated: DB is larger than DB6 and is equal to 0.14Hz, all millisecond-level frequency modulation objects are started, DB5 is larger than DB and is not larger than DB6 and is equal to 0.14Hz, energy storage frequency modulation, photovoltaic frequency modulation and wind power frequency modulation are started, DB4 is larger than 0.08Hz and is not larger than DB5 and is equal to 0.1Hz, photovoltaic frequency modulation and wind power frequency modulation are started, DB3 is larger than DB and is not larger than DB4 and is equal to 0.08Hz, wind power frequency modulation is started, DB3 is not larger than DB 3506 Hz, and millisecond-level frequency modulation objects are not started.
And when the frequency modulation range is 0.05Hz/s, DDB2 is more than DDB and is less than or equal to DDB1, and the frequency modulation range is started in hundred milliseconds.
When DDB is less than or equal to DDB2 and is 0.05Hz/s, a second-level modulation frequency domain is started: and DB is greater than DB2 and equal to 0.05Hz, all frequency modulation objects of second level are started, 0.033Hz is greater than DB1 and less than or equal to DB2 and equal to 0.05Hz, thermal frequency modulation is started, DB is less than or equal to DB1 and equal to 0.033Hz, the frequency modulation objects of second level are not started, and no difference adjustment can be carried out by adopting other frequency modulation modes such as AGC and the like.
and when the DB is more than or equal to the DBM and is equal to 0.16Hz, not judging the frequency change rate, and starting all frequency modulation objects.
And if the frequency of the power grid system is less than 50Hz, determining the frequency modulation object according to DB1 '-DB 6'.
Referring to fig. 3, a logic diagram of a frequency modulation function provided for the embodiment of the present application is shown, in fig. 3, L1 is a boundary between a millisecond-level frequency modulation and a hundred millisecond-level frequency modulation, L2 is a boundary between a hundred millisecond-level frequency modulation and a second-level frequency modulation, t1-t7 respectively represent frequency modulation delays of RF1-RF6, and t1 '-t 7' respectively represent frequency modulation delay adjustment values of RF1-RF6, when a frequency variation of a grid system is higher than a DBM, a corresponding frequency modulation means is directly activated, frequency modulation delays are set to be t1 '-t 7', and t1 '-t 7' is set to be smaller than corresponding t1-t7, so that frequency modulation efficiency is improved and frequency stabilization is performed. Of course, t1-t7 and t1 '-t 7' may be set to 0 without setting the fm delay. When the frequency variation of the power grid system is lower than the DBM, the frequency modulation level is determined according to the value (positive value) of the DDB, and the frequency modulation means is determined according to the values (positive value or negative value) of the DDB and the DB.
As can be seen from the foregoing embodiments, the asynchronous transmitting-end power grid automatic frequency modulation method provided by the embodiment of the present application has the beneficial effects that:
1. The power grid frequency modulation is subjected to architecture design, function positioning and frequency modulation region division from a system level.
2. the method comprises the steps of carrying out frequency modulation interval division on various frequency modulation modes, introducing frequency change rate, realizing response division of different modulation frequency domains, adopting a frequency modulation object with quick response when the frequency change is quick, and adopting a frequency modulation object with slower response when the frequency change is slow. When the frequency changes rapidly, the frequency modulation object with slow response has no time to act, and the spare capacity arrangement is rotated according to different frequency modulation domains so as to reduce the frequency fluctuation amplitude. When the frequency changes slowly, the frequency modulation object with fast response is easy to cause the interleaving action. The frequency modulation domain is divided according to the frequency change rate, so that the division and the positioning of each frequency modulation function are effectively ensured.
3. the functional positioning of different frequency modulation objects is carried out through the frequency modulation dead zone on a specific time frequency modulation level (corresponding to a specific frequency modulation domain), so that the step adjustment of different frequency modulation objects on the frequency modulation domain is realized, and the frequency fluctuation and the frequency oscillation caused by the staggered action of all the frequency modulation objects on the frequency modulation domain are effectively avoided.
4. At a millisecond-level frequency modulation level (corresponding to a millisecond-level frequency modulation domain), a frequency modulation dead zone of new energy (photovoltaic frequency modulation and wind power frequency modulation) is smaller than a frequency modulation dead zone of direct current FLC frequency modulation, DB3 is set to be not less than DB4 and not less than DB5 and not more than DB6, the frequency modulation dead zone of the direct current FLC frequency modulation is larger than other frequency modulation objects, the action frequency of the direct current FLC frequency modulation is effectively reduced, and the power fluctuation of a receiving-end power grid caused by the direct current FLC frequency modulation action of an asynchronous transmitting-end power grid.
5. The frequency modulation level with large response time has a frequency modulation dead zone smaller than that of the frequency modulation level with small response time, so that the fast coarse adjustment of the frequency modulation means with small inertia is realized, the slow fine adjustment of the frequency modulation means with large inertia is realized, the level adjustment of the frequency is realized, and the fast stabilization of the system frequency is facilitated.
6. The frequency modulation method is realized by optimizing the control program and the frequency modulation parameters without adding extra equipment facilities, so that high cost investment caused by transformation is avoided.
7. According to the frequency modulation method and device, the frequency modulation function is planned and organized from the system level, the frequency modulation function is not limited to a single device, the frequency modulation effects of various devices can complement each other, and the system frequency adjustment effect is maximized.
since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
the above-described embodiments of the present application do not limit the scope of the present application.
Claims (8)
1. An automatic frequency modulation method for an asynchronous transmitting-end power grid is characterized by comprising the following steps:
Detecting the frequency variation and the frequency variation rate of the power grid system;
comparing the frequency variation with a frequency modulation high threshold;
If the frequency variation is smaller than the frequency modulation high threshold, obtaining the frequency modulation level of the power grid system on the time dimension according to the frequency variation rate;
Starting a corresponding frequency modulation domain according to the frequency modulation level;
Obtaining a frequency modulation object of the power grid system in the frequency modulation domain according to the frequency variation;
and starting the frequency modulation object to modulate the frequency of the power grid system.
2. the method for automatically tuning an asynchronous transmitting power grid according to claim 1, wherein obtaining the tuning level of the power grid system in the time dimension according to the frequency change rate comprises:
comparing the frequency change rate with a first frequency modulation threshold and a second frequency modulation threshold respectively;
If the frequency change rate is larger than the first frequency modulation threshold value, determining that the frequency modulation level is millisecond level;
If the frequency change rate is smaller than or equal to the first frequency modulation threshold and larger than the second frequency modulation threshold, determining that the frequency modulation level is hundred milliseconds;
And if the frequency change rate is less than or equal to the second frequency modulation threshold value, determining that the frequency modulation level is in the second level.
3. the method for automatically tuning the asynchronous transmitting-end power grid according to claim 1, wherein obtaining the tuning target of the power grid system in the tuning domain according to the frequency variation comprises:
Comparing the frequency variation with a sixth frequency modulation dead zone, a fifth frequency modulation dead zone, a fourth frequency modulation dead zone and a third frequency modulation dead zone respectively according to the condition that the frequency modulation domain is in millisecond level;
If the frequency variation is larger than the sixth frequency modulation dead zone, all frequency modulation objects of the millisecond level are selected;
If the frequency variation is smaller than or equal to the sixth frequency modulation dead zone and larger than the fifth frequency modulation dead zone, selecting the millisecond-level first frequency modulation object;
If the frequency variation is smaller than or equal to the fifth frequency modulation dead zone and larger than the fourth frequency modulation dead zone, selecting a second frequency modulation object of the millisecond level;
If the frequency variation is smaller than or equal to the fourth frequency modulation dead zone and larger than the third frequency modulation dead zone, selecting a third frequency modulation object of the millisecond level;
Comparing the frequency variation with a second frequency modulation dead zone and a first frequency modulation dead zone respectively according to the second level of the frequency modulation domain;
If the frequency variation is larger than the second frequency modulation dead zone, all frequency modulation objects of the second level are selected;
And if the frequency variation is smaller than or equal to the second frequency modulation dead zone and larger than the first frequency modulation dead zone, selecting a fourth frequency modulation object of the millisecond level.
4. an asynchronous transmit-side power grid auto-frequency modulation method as defined in claim 3, further comprising:
According to the fact that the frequency modulation domain is in a millisecond level, if the frequency variation is smaller than or equal to the third frequency modulation dead zone, the frequency modulation object in the millisecond level is not started;
and if the frequency variation is smaller than or equal to the first frequency modulation dead zone, not starting the frequency modulation object of the second level.
5. the method for automatically modulating the frequency of an asynchronous transmitting-end power grid according to claim 3, wherein the first frequency modulation object comprises an energy storage frequency modulation, a photovoltaic frequency modulation and a wind power frequency modulation, the second frequency modulation object comprises the photovoltaic frequency modulation and the wind power frequency modulation, the third frequency modulation object comprises the wind power frequency modulation, the fourth frequency modulation object comprises a thermal power frequency modulation, and the millisecond-level frequency modulation object further comprises a direct current FLC frequency modulation.
6. The asynchronous transmit-side power grid auto-frequency tuning method of claim 3, wherein the frequency tuning high threshold comprises 0.16Hz, the sixth frequency tuning dead zone comprises 0.14Hz, the fifth frequency tuning dead zone comprises 0.1Hz, the fourth frequency tuning dead zone comprises 0.08Hz, the third frequency tuning dead zone comprises 0.06Hz, the second frequency tuning dead zone comprises 0.05Hz, the first frequency tuning dead zone comprises 0.033Hz, the first frequency tuning threshold comprises 0.1Hz/s, and the second frequency tuning threshold comprises 0.05 Hz/s.
7. The method of claim 1, wherein detecting the frequency change amount and frequency change rate of the grid system further comprises: and dividing the frequency modulation level of the frequency modulation object according to the response time.
8. An asynchronous transmit-side power grid auto-frequency modulation method as defined in claim 1, further comprising:
And if the frequency variation is larger than the frequency modulation high threshold, starting all frequency modulation objects of all frequency modulation levels to modulate the frequency of the power grid system.
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