CN111276984B - Method and system for cooperative control of primary frequency modulation subareas of direct-current floor point near-district power grid - Google Patents
Method and system for cooperative control of primary frequency modulation subareas of direct-current floor point near-district power grid Download PDFInfo
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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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
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Abstract
The invention discloses a method and a system for primary frequency modulation zone cooperative control of a direct current floor point near-zone power grid, wherein the method comprises the following steps: monitoring an operation state signal of an extra-high voltage direct current line in real time, and sending the operation state signal to a unit set participating in primary frequency modulation cooperative control in a direct current drop point near area; performing primary frequency modulation compensation area division on a near area of a direct current landing place; and generating a primary frequency modulation control instruction of the direct-current drop point near-zone unit set, and performing zone control. The invention effectively improves the primary frequency modulation capability of the power grid, shortens the frequency recovery time of the power grid and ensures the safe and stable operation of the power grid.
Description
Technical Field
The invention relates to a primary frequency modulation partition cooperative control method for a direct-current floor point near-region power grid, and belongs to the technical field of power grid control.
Background
With the maturity of the technology of the direct-current extra-high voltage transmission equipment, high-voltage and high-power direct-current transmission is rapidly developed. At present, 10 ultrahigh voltage direct current transmission lines which are put into operation in China have the highest direct current rated voltage of +/-1100 kilovolts, the transmission distance of 3293 kilovolts and the transmission capacity of 1200 kilovolts, and play an important role in supporting the aspects of balance supply, remote energy secondary adjustment and the like of the whole power system.
Due to the technical characteristics of large transmission capacity, lack of reactive support and the like of extra-high voltage direct current transmission, the influence on the stability of a receiving end power grid system in a near area of a direct current grounding point is large, the direct current blocking load reduction can cause larger fluctuation of the power grid frequency in the same active power shortage in the power grid, and the safe and stable operation of the near area power grid of the direct current grounding point is not facilitated.
With the wide application of the extra-high voltage direct current transmission line, the long-distance transfer application of the large-capacity load becomes a new normal state of a future power grid. For a receiving-end power grid, the frequency modulation technical means of the power grid also needs to be further improved, and the safe and stable operation of the power grid is ensured. Therefore, a grid primary frequency modulation partition cooperative control measure needs to be provided for solving the problems of large grid frequency fluctuation and long recovery time caused by load reduction of a receiving-end grid when an ultrahigh-voltage direct-current line is locked due to faults.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a system for primary frequency modulation partition cooperative control of a near-area power grid of a direct-current floor point, which can effectively reduce the fluctuation of the power grid frequency during the locking of extra-high voltage direct current and shorten the recovery time of the power grid frequency.
The technical scheme adopted for solving the technical problems is as follows:
on one hand, the method for cooperative control of primary frequency modulation subareas of a direct-current floor point near-district power grid provided by the embodiment of the invention comprises the following steps:
monitoring an operation state signal of an extra-high voltage direct current line in real time, and sending the operation state signal to a unit set participating in primary frequency modulation cooperative control in a direct current drop point near area;
performing primary frequency modulation compensation area division on a near area of a direct current landing place;
and generating a primary frequency modulation control instruction of the direct-current drop point near-zone unit set, and performing zone control.
As a possible implementation manner of this embodiment, the operation state signal of the extra-high voltage direct current line includes normal operation or latch-up shutdown.
As a possible implementation manner of this embodiment, when the operation state of the extra-high voltage dc line is a lock-up shutdown, the dc floor point near area is divided into an emergency frequency modulation compensation area, a buffer frequency modulation compensation area, and a normal frequency modulation compensation area according to the historical data of the lowest drop value of the power grid frequency.
As a possible implementation manner of this embodiment, when the operation state of the extra-high voltage dc line is normal operation, the near zone of the dc floor point is a normal regulation zone.
As a possible implementation manner of this embodiment, the process of generating the primary frequency modulation control instruction of the direct-current drop point near-zone unit set includes the following steps:
respectively generating frequency modulation instructions of an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to the state signals divided by the direct-current floor near area;
when the unit set is in a normal frequency modulation compensation area, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F1 (x);
when the unit set is in a buffer frequency modulation compensation area and the direct-current line normally runs, primary frequency modulation compensation is carried out according to the power grid running frequency difference delta F and the output instruction of a primary frequency modulation compensation calculation function F1 (x); when the direct current is locked, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F2 (x);
when the unit set is in an emergency frequency modulation compensation area and the direct current line normally runs, primary frequency modulation compensation is carried out according to the power grid running frequency difference delta F and the output instruction of a primary frequency modulation compensation calculation function F1 (x); when the direct current line has unipolar latching or bipolar latching, the unipolar latching preset value C1 or the bipolar latching preset value C2 is directly selected as a primary frequency modulation compensation command to carry out emergency frequency modulation compensation.
As a possible implementation manner of this embodiment, the bipolar latch-up preset value C2 is set as the primary frequency modulation maximum adjustment compensation amount, and the unipolar latch-up preset value C1 is set as 80% of the primary frequency modulation maximum adjustment compensation amount.
On the other hand, the system for cooperative control of primary frequency modulation subareas of a direct-current floor-point near-district power grid provided by the embodiment of the invention comprises:
the running state monitoring module is used for monitoring running state signals of the extra-high voltage direct current line in real time and sending the running state signals to the unit set participating in primary frequency modulation cooperative control in the direct current drop point near area;
the area division module is used for carrying out primary frequency modulation compensation area division on the near area of the direct current landing place;
and the instruction generating module is used for generating a primary frequency modulation control instruction of the direct-current falling point near-zone unit set and guiding the direct-current falling point near-zone unit set to perform zone control.
As a possible implementation manner of this embodiment, the operation state signal of the extra-high voltage direct current line includes normal operation or latch-up shutdown.
As a possible implementation manner of this embodiment, the area division module includes a blocking outage area division module and a normal operation area division module, and the blocking outage area division module is configured to divide a dc floor point near area into an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to historical data of a lowest drop value of a power grid frequency when an operation state of the extra-high voltage dc line is a blocking outage; and the normal operation area division module is used for taking the near area of the direct current grounding point as a normal regulation division area when the operation state of the extra-high voltage direct current line is normal operation.
As a possible implementation manner of this embodiment, the instruction generating module includes:
the frequency modulation instruction generation module is used for respectively generating frequency modulation instructions of an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to the state signals divided by the direct-current floor near area;
the normal frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F1(x) when the unit set is in a normal frequency modulation compensation area;
the buffer frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and a primary frequency modulation compensation calculation function F1(x) output instruction when the unit set is in a buffer frequency modulation compensation area and the direct-current line normally operates; when the direct current is locked, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F2 (x);
the emergency frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and a primary frequency modulation compensation calculation function F1(x) output instruction when the unit set is in an emergency frequency modulation compensation area and the direct-current line normally operates; when the direct current line has unipolar latching or bipolar latching, the unipolar latching preset value C1 or the bipolar latching preset value C2 is directly selected as a primary frequency modulation compensation command to carry out emergency frequency modulation compensation.
As a possible implementation manner of this embodiment, the bipolar latch-up preset value C2 is set as the primary frequency modulation maximum adjustment compensation amount, and the unipolar latch-up preset value C1 is set as 80% of the primary frequency modulation maximum adjustment compensation amount.
The technical scheme of the embodiment of the invention has the following beneficial effects:
aiming at the problem that the frequency fluctuation of a near-area power grid of a direct-current grounding point is large when an ultrahigh-voltage direct-current line is locked, the technical scheme of the embodiment of the invention provides a method for the primary frequency modulation zone cooperative control of the near-area power grid of the direct-current grounding point, which comprises the following steps: monitoring an operation state signal of an extra-high voltage direct current line in real time, and sending the operation state signal to a unit set participating in primary frequency modulation cooperative control in a direct current drop point near area; performing primary frequency modulation compensation area division on a near area of a direct current landing place; and generating a primary frequency modulation control instruction of the direct-current drop point near-zone unit set, and performing zone control. The invention effectively improves the primary frequency modulation capability of the power grid, shortens the frequency recovery time of the power grid and ensures the safe and stable operation of the power grid.
According to the technical scheme of the embodiment of the invention, the power supply participating in primary frequency modulation in the near-area power grid of the extra-high voltage direct current grounding point is subjected to zone setting according to the space distribution of power grid frequency drop when the direct current is locked, the control parameters and the logic configuration of the power supply participating in primary frequency modulation are optimized, and the primary frequency modulation power supply in the regional power grid which is close in electrical connection distance and large in influence is subjected to maximum capacity compensation within a safe operation permission range; the compensation amplitude of the primary frequency modulation power supply in the regional power grid which is far away from the electrical connection distance and has smaller influence is smaller, and the whole extra-high voltage floorpoint near-region power grid carries out zone control response to replace all control compensation schemes of the same type participating in synchronous passive frequency modulation action of the primary frequency modulation power supply in the direct-current floorpoint near-region power grid.
Description of the drawings:
fig. 1 is a flow chart illustrating a method for cooperative control of primary frequency modulation partitions of a near-zone power grid of a dc floor site according to an exemplary embodiment;
fig. 2 is a schematic diagram of a primary frequency modulation zone of a dc site near-zone grid according to an exemplary embodiment;
fig. 3 is a logic diagram illustrating a dc drop point near zone unit set primary frequency modulation control command generation according to an exemplary embodiment.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Fig. 1 is a flowchart illustrating a method for cooperative control of primary frequency modulation partitions of a near-zone power grid of a dc landing point according to an exemplary embodiment. As shown in fig. 1, a method for cooperative control of primary frequency modulation partitions of a near-zone power grid of a dc floor point provided in an embodiment of the present invention includes the following steps:
monitoring an operation state signal of an extra-high voltage direct current line in real time, and sending the operation state signal to a unit set participating in primary frequency modulation cooperative control in a direct current drop point near area;
performing primary frequency modulation compensation area division on a near area of a direct current landing place;
and generating a primary frequency modulation control instruction of the direct-current drop point near-zone unit set, and performing zone control.
As a possible implementation manner of this embodiment, the operation state signal of the extra-high voltage direct current line includes normal operation or latch-up shutdown.
As a possible implementation manner of this embodiment, when the operation state of the extra-high voltage dc line is a latch-up shutdown, the dc floor point near zone is divided into an emergency frequency modulation compensation zone, a buffer frequency modulation compensation zone, and a normal frequency modulation compensation zone according to the historical data of the lowest drop value of the power grid frequency, as shown in fig. 2.
As a possible implementation manner of this embodiment, when the operation state of the extra-high voltage dc line is normal operation, the near zone of the dc floor point is a normal regulation zone.
As a possible implementation manner of this embodiment, the process of generating the primary frequency modulation control instruction of the direct-current drop point near-zone unit set includes the following steps:
respectively generating frequency modulation instructions of an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to the state signals divided by the direct-current floor near area;
when the unit set is in a normal frequency modulation compensation area, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F1 (x);
when the unit set is in a buffer frequency modulation compensation area and the direct-current line normally runs, primary frequency modulation compensation is carried out according to the power grid running frequency difference delta F and the output instruction of a primary frequency modulation compensation calculation function F1 (x); when the direct current is locked, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F2 (x);
when the unit set is in an emergency frequency modulation compensation area and the direct current line normally runs, primary frequency modulation compensation is carried out according to the power grid running frequency difference delta F and the output instruction of a primary frequency modulation compensation calculation function F1 (x); when the direct current line has unipolar latching or bipolar latching, the unipolar latching preset value C1 or the bipolar latching preset value C2 is directly selected as a primary frequency modulation compensation command to carry out emergency frequency modulation compensation.
As a possible implementation manner of this embodiment, the bipolar latch-up preset value C2 is set as the primary frequency modulation maximum adjustment compensation amount, and the unipolar latch-up preset value C1 is set as 80% of the primary frequency modulation maximum adjustment compensation amount.
On the other hand, the system for cooperative control of primary frequency modulation subareas of a direct-current floor-point near-district power grid provided by the embodiment of the invention comprises:
the running state monitoring module is used for monitoring running state signals of the extra-high voltage direct current line in real time and sending the running state signals to the unit set participating in primary frequency modulation cooperative control in the direct current drop point near area;
the area division module is used for carrying out primary frequency modulation compensation area division on the near area of the direct current landing place;
and the instruction generating module is used for generating a primary frequency modulation control instruction of the direct-current falling point near-zone unit set and guiding the direct-current falling point near-zone unit set to perform zone control.
As a possible implementation manner of this embodiment, the operation state signal of the extra-high voltage direct current line includes normal operation or latch-up shutdown.
As a possible implementation manner of this embodiment, the area division module includes a blocking outage area division module and a normal operation area division module, and the blocking outage area division module is configured to divide a dc floor point near area into an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to historical data of a lowest drop value of a power grid frequency when an operation state of the extra-high voltage dc line is a blocking outage; and the normal operation area division module is used for taking the near area of the direct current grounding point as a normal regulation division area when the operation state of the extra-high voltage direct current line is normal operation.
As a possible implementation manner of this embodiment, the instruction generating module includes:
the frequency modulation instruction generation module is used for respectively generating frequency modulation instructions of an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to the state signals divided by the direct-current floor near area;
the normal frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F1(x) when the unit set is in a normal frequency modulation compensation area;
the buffer frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and a primary frequency modulation compensation calculation function F1(x) output instruction when the unit set is in a buffer frequency modulation compensation area and the direct-current line normally operates; when the direct current is locked, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F2 (x);
the emergency frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and a primary frequency modulation compensation calculation function F1(x) output instruction when the unit set is in an emergency frequency modulation compensation area and the direct-current line normally operates; when the direct current line has unipolar latching or bipolar latching, the unipolar latching preset value C1 or the bipolar latching preset value C2 is directly selected as a primary frequency modulation compensation command to carry out emergency frequency modulation compensation.
As a possible implementation manner of this embodiment, the bipolar latch-up preset value C2 is set as the primary frequency modulation maximum adjustment compensation amount, and the unipolar latch-up preset value C1 is set as 80% of the primary frequency modulation maximum adjustment compensation amount.
The specific implementation process of the invention for carrying out primary frequency modulation subarea cooperative control on the direct current floor point near-area power grid is as follows.
(1) And monitoring the running state signal (normal running or locking shutdown) of the extra-high voltage direct current line in real time, and sending the extra-high voltage direct current running state signal to a unit set/generator set which participates in primary frequency modulation cooperative control in a direct current drop point near region.
(2) When the extra-high voltage direct current is locked, the frequency near the grounding point is reduced to the maximum, and the power grid frequency drop value is smaller along with the increase of the electrical distance. And performing primary frequency modulation compensation regional division on the near region of the direct current landing place according to historical data such as the lowest drop value of the power grid frequency of each region and the like when the direct current line is locked. According to the scheme, the direct current floor point near area is divided into an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area, and the schematic diagram of the area division is shown in figure 2.
(3) Partition control enforcement
The unit of the primary frequency modulation is participated in the regulation and compensation emergency area, after receiving the extra-high voltage direct current blocking signal, the active compensation is directly carried out with the maximum compensation capacity (the compensation size can be set according to the system requirement), after the power grid operation frequency is recovered to be normal, the frequency modulation compensation instruction is recovered at a certain speed (the adjustment can be set), and after the recovery is finished, the unit is switched to a normal primary frequency modulation compensation loop.
The primary frequency modulation compensation loop is switched to a buffer adjustment compensation mode after receiving the extra-high voltage direct current blocking signal, so that the unequal rate of the generator set is automatically reduced, a compensation instruction changes according to the change of the power grid frequency, and the primary frequency modulation capacity of the generator set is improved. And switching to a normal primary frequency modulation compensation loop after the running frequency of the power grid is recovered to be normal.
And the unit participating in the primary frequency modulation in the normal regulation and compensation area performs primary frequency modulation according to related technical standards to perform compensation regulation, and does not perform optimal response on the locking of the extra-high voltage direct current.
The logic for generating the primary frequency modulation control instruction of the direct current drop point near-zone unit set is shown in fig. 3. In fig. 3, the Δ f module calculates a power grid frequency deviation Δ f — fn according to the real-time operating frequency f and the rated frequency fn of the power grid, and sends the power grid frequency deviation Δ f to the frequency modulation command calculation module f (x); a module F (x) and a primary frequency modulation compensation calculation function, wherein the primary frequency modulation compensation calculation function comprises F1(x) and F2(x), and a unit primary frequency modulation control instruction is mainly calculated according to power grid frequency deviation, rotating speed unequal rate, primary frequency modulation instruction amplitude limiting and the like; T1-T5 are data selection modules, when the selection condition is 1, the output value is equal to the input value of Y end, when the selection condition is 0, the output end is equal to the input value of N end; c1 and C2 are set constant values.
The specific process for generating the primary frequency modulation control instruction of the direct-current drop point near-zone unit set comprises the following steps:
1) firstly, dividing state signals according to a direct current floor near zone, classifying an emergency frequency modulation compensation zone, a buffer frequency modulation compensation zone and a normal frequency modulation compensation zone through two data selection modules T1 and T2.
2) When the unit is in a normal frequency modulation compensation zone, namely the normal regulation zone is judged to be 1, the output end of the T1 module is equal to the input value of the Y end of the unit, namely the unit performs primary frequency modulation compensation according to the power grid operation frequency difference delta F and the output instruction of a primary frequency modulation compensation calculation function F1(x), wherein the F1(x) function setting follows the requirements of the Primary frequency modulation test and Performance acceptance guide rules of the thermal generator set (GBT 30370 and 2013), for example, a 600MW thermal generator set is provided, the dead zone is set to be 0.033Hz, the rotating speed inequality rate is set to be 5%, and the specific compensation function is shown in Table 1.
Primary frequency modulation compensation function of meter 1600 MW thermal generator set
3) When the unit is in the buffer fm compensation zone, i.e., the normal adjustment zone is determined to be 0 and the emergency/buffer zone is determined to be 1, the output terminal of the T1 module is equal to the input value of the N terminal thereof, and the output terminal of the T2 module is equal to the input value of the Y terminal thereof. When the direct-current line normally runs, the compensation buffer mode of the unit is 0, the output end of the T3 module is equal to the input value of the N end of the unit, and the primary frequency modulation compensation of the unit is in a normal mode, namely, the unit carries out primary frequency modulation compensation according to the running frequency difference delta F of a power grid and an output instruction of a primary frequency modulation compensation calculation function F1 (x); when direct current is locked, the compensation buffer mode of the trigger unit is 1, the output end of the T3 module is equal to the input value of the Y end of the trigger unit, the unit performs primary frequency modulation compensation according to the power grid operation frequency difference delta F and the primary frequency modulation compensation calculation function F2(x) output instruction, wherein in the F2(x) function, in order to guarantee the unit operation safety, the primary frequency modulation amplitude limiting value is 6% of rated load and is unchanged, but the rotating speed unequal rate is reduced, the primary frequency modulation capacity of the unit is enhanced, generally 3% (adjustable according to the power grid operation condition) can be set, and at this time, the specific compensation function of the 600MW thermal power unit is shown in Table 2.
TABLE 2 Primary frequency modulation compensation function of 600MW thermal generator set in buffer frequency modulation compensation zone
4) When the unit is in an emergency frequency modulation compensation area, namely the normal regulation subarea is judged to be 0 and the emergency/buffer subarea is judged to be 0, the output end of the T1 module is equal to the input value of the N end thereof, the output end of the T2 module is equal to the input value of the N end thereof, when a direct current line normally runs, the unit compensation emergency mode is 0, the output end of the T4 module is equal to the input value of the N end thereof, the unit primary frequency modulation compensation is in a normal mode, namely, the unit carries out primary frequency modulation compensation according to the power grid running frequency difference delta F and the primary frequency modulation compensation calculation function F1(x) output; when the direct current line is subjected to monopolar locking or bipolar locking, the trigger unit compensation emergency mode is 1, and the output end of the T4 module is equal to the input value of the Y end of the T4 module; and the T5 module directly selects a preset unit value C1 (single-pole locking) or C2 (double-pole locking) as a primary frequency modulation compensation command according to the number of locking poles of the direct-current line to perform emergency frequency modulation compensation. The C1 and C2 can be adjusted according to the actual safe operation of the power grid and the unit, generally, C2 is set as the maximum adjustment compensation amount of the primary frequency modulation, and C1 is set as 80% of the maximum adjustment compensation amount of the primary frequency modulation.
The emergency compensation adjustment mode replaces a control scheme of primary frequency modulation according to the power grid frequency difference in a conventional scheme, and has the advantages that the primary frequency modulation action is directly performed in advance without waiting for the change of the power grid operating frequency, the response time of the primary frequency modulation of the unit is greatly shortened, and the stable operating capacity of the power grid is improved.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Claims (8)
1. A method for cooperative control of primary frequency modulation subareas of a direct-current floor point near-district power grid is characterized by comprising the following steps:
monitoring an operation state signal of an extra-high voltage direct current line in real time, and sending the operation state signal to a unit set participating in primary frequency modulation cooperative control in a direct current drop point near area;
performing primary frequency modulation compensation area division on a near area of a direct current landing place;
generating a primary frequency modulation control instruction of the direct current drop point near-zone unit set, and performing zone control;
the process of generating the primary frequency modulation control instruction of the direct-current drop point near-zone unit set comprises the following steps:
respectively generating frequency modulation instructions of an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to the state signals divided by the direct-current floor near area;
when the unit set is in a normal frequency modulation compensation area, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F1 (x);
when the unit set is in a buffer frequency modulation compensation area and the direct-current line normally runs, primary frequency modulation compensation is carried out according to the power grid running frequency difference delta F and the output instruction of a primary frequency modulation compensation calculation function F1 (x); when the direct current is locked, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F2 (x);
when the unit set is in an emergency frequency modulation compensation area and the direct current line normally runs, primary frequency modulation compensation is carried out according to the power grid running frequency difference delta F and the output instruction of a primary frequency modulation compensation calculation function F1 (x); when the direct current line has unipolar latching or bipolar latching, the unipolar latching preset value C1 or the bipolar latching preset value C2 is directly selected as a primary frequency modulation compensation command to carry out emergency frequency modulation compensation.
2. The method according to claim 1, wherein the operating status signal of the extra-high voltage dc line comprises normal operation or lock-up shutdown.
3. The method according to claim 2, wherein when the operation status of the extra-high voltage dc line is locked and stopped, the dc ground near-zone is divided into an emergency fm compensation zone, a buffer fm compensation zone, and a normal fm compensation zone according to historical data of a lowest grid frequency drop value.
4. The method according to claim 3, wherein the operating state of the extra-high voltage direct current line is normal operation, and the near-dc-ground-point is a normal regulation zone.
5. The method as claimed in claim 1, wherein the preset bipolar latch-up C2 is set as the maximum primary tuning compensation amount, and the preset unipolar latch-up C1 is set as 80% of the maximum primary tuning compensation amount.
6. A system for cooperative control of primary frequency modulation subareas of a direct-current floor point near-district power grid is characterized by comprising:
the running state monitoring module is used for monitoring running state signals of the extra-high voltage direct current line in real time and sending the running state signals to the unit set participating in primary frequency modulation cooperative control in the direct current drop point near area;
the area division module is used for carrying out primary frequency modulation compensation area division on the near area of the direct current landing place;
the instruction generation module is used for generating a primary frequency modulation control instruction of the direct-current drop point near-zone unit set and guiding the direct-current drop point near-zone unit set to perform zone control;
the instruction generation module comprises:
the frequency modulation instruction generation module is used for respectively generating frequency modulation instructions of an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to the state signals divided by the direct-current floor near area;
the normal frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F1(x) when the unit set is in a normal frequency modulation compensation area;
the buffer frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and a primary frequency modulation compensation calculation function F1(x) output instruction when the unit set is in a buffer frequency modulation compensation area and the direct-current line normally operates; when the direct current is locked, primary frequency modulation compensation is carried out according to the power grid operation frequency difference delta F and an output instruction of a primary frequency modulation compensation calculation function F2 (x);
the emergency frequency modulation compensation module is used for performing primary frequency modulation compensation according to the power grid operation frequency difference delta F and a primary frequency modulation compensation calculation function F1(x) output instruction when the unit set is in an emergency frequency modulation compensation area and the direct-current line normally operates; when the direct current line has unipolar latching or bipolar latching, the unipolar latching preset value C1 or the bipolar latching preset value C2 is directly selected as a primary frequency modulation compensation command to carry out emergency frequency modulation compensation.
7. The system according to claim 6, wherein the operating status signal of the extra-high voltage dc line comprises normal operation or lock-up shutdown.
8. The system according to claim 7, wherein the area division module comprises a blocking and stopping area division module and a normal operation area division module, and the blocking and stopping area division module is used for dividing the near-area of the direct current floor point into an emergency frequency modulation compensation area, a buffer frequency modulation compensation area and a normal frequency modulation compensation area according to the historical data of the lowest drop value of the power grid frequency when the operation state of the extra-high voltage direct current line is blocking and stopping; and the normal operation area division module is used for taking the near area of the direct current grounding point as a normal regulation division area when the operation state of the extra-high voltage direct current line is normal operation.
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