CN118008688A - Wind power plant power limiting shutdown method and system - Google Patents

Wind power plant power limiting shutdown method and system Download PDF

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Publication number
CN118008688A
CN118008688A CN202410113600.2A CN202410113600A CN118008688A CN 118008688 A CN118008688 A CN 118008688A CN 202410113600 A CN202410113600 A CN 202410113600A CN 118008688 A CN118008688 A CN 118008688A
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power
fan
wind
minimum
value
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高静方
赵冰
丁亮
曹扬
王亮
董健
汪正军
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Guodian United Power Technology Co Ltd
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Guodian United Power Technology Co Ltd
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Priority to CN202410113600.2A priority Critical patent/CN118008688A/en
Publication of CN118008688A publication Critical patent/CN118008688A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/028—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
    • F03D7/0284—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power in relation to the state of the electric grid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a wind farm power limiting shutdown method and system, and belongs to the technical field of wind power generation. The method comprises the following steps: acquiring a wind power plant dispatching instruction and fan operation parameters; determining the lowest regulating power of each fan according to the fan operation parameters; and carrying out power limiting shutdown according to the wind farm dispatching instruction, the fan operation parameters and the minimum regulating power of each fan. The power-limiting shutdown includes: adjusting grid-connected fan power according to a wind farm dispatching instruction, fan operation parameters and the lowest adjusting power of each fan, and calculating the number of halts according to the adjusted fan operation parameters when all the grid-connected fan active powers are equal to the corresponding lowest adjusting power and the full-farm active power is larger than the wind farm dispatching instruction; and (3) down-controlling the shutdown instruction to the corresponding fan to finish shutdown adjustment. And determining the minimum regulating power according to the fan operation parameters, and realizing that different minimum regulating powers are adopted under different wind conditions.

Description

Wind power plant power limiting shutdown method and system
Technical Field
The invention relates to the technical field of wind power generation, in particular to a wind power plant power limiting shutdown method and a wind power plant power limiting shutdown system.
Background
Under the condition of large wind power limit, the wind turbine generator needs to be greatly pitched, and adverse effects can be generated on the operation of a fan and the stability of a power system. Firstly, the fatigue load of the fan can be increased, and the fatigue damage of the fan can be possibly caused, so that the service life of the fan is shortened. And secondly, harmonic waves and unbalanced currents can be generated in the running process of the rotor of the fan, so that the stability of the power system is adversely affected.
Aiming at the problem of overlarge pitch, the main control can generally increase a protection strategy of overlarge pitch angle, and the main control is directly stopped when a certain condition is reached. This may result in fans not regulating the lowest regulated power of the energy management system during some windy weather, thereby affecting full-field limited power follow-up. This phenomenon is generally addressed by avoiding the problem of improper regulation by adjusting the minimum power setpoint of the energy management system. However, when the lowest power set value is increased, the problem of frequent start-stop of the fan can be generated, and too many start-stops are also unfavorable for the fan.
Disclosure of Invention
The invention aims to provide a power limiting and stopping method and system for a wind power plant, wherein the method determines the minimum regulating power according to the running parameters of a fan, different minimum regulating powers are adopted under different wind conditions, and the larger minimum regulating power is used for avoiding overlarge power limitation when a propeller is opened for a long time on a large wind day, so that the whole-field regulation is easier to enter a stopping mode for limiting power, and meanwhile, the purpose of protecting the fan is achieved; the minimum regulating power is used in a small wind day, so that the whole-field regulation is limited by adopting a power reduction mode as much as possible, and the frequency of starting and stopping of a fan is reduced.
To achieve the above object, a first aspect of the present invention provides a wind farm power-limiting shutdown method, the method comprising:
Acquiring a wind power plant dispatching instruction and fan operation parameters; the wind power plant dispatching instruction comprises a wind power plant dispatching instruction given power, and the fan operation parameters at least comprise fan wind speed, fan active power and grid connection state;
determining the lowest regulating power of each fan according to the fan operation parameters, including:
calculating the average value of wind speeds of all grid-connected fans within a preset time period according to the fan operation parameters;
Comparing the wind speed average value with a wind speed threshold value, and if the wind speed average value is smaller than a first wind speed threshold value and the preset duration is continued, judging that the current wind condition is a small wind condition; if the average wind speed value is larger than the second wind speed threshold value and the preset duration is continued, judging that the current wind condition is a big wind condition; the second wind speed threshold value is greater than the first wind speed threshold value;
Under the condition of small wind, determining the first minimum regulating power of the corresponding fan as the minimum regulating power; and under the condition of high wind, determining the second minimum regulating power of the corresponding fan as the lowest regulating power, wherein the second minimum regulating power is larger than the first minimum regulating power.
According to the technical means, the lowest regulating power is determined according to the fan operation parameters, and different lowest regulating powers are adopted as lower limits of power regulation under different wind conditions, so that the purpose of avoiding overlarge power limitation when the fan is opened for a long time on a large wind day is achieved, and the larger lowest regulating power is used, so that the whole-field regulation is easier to enter a shutdown mode to limit power, and meanwhile, the purpose of protecting the fan is achieved; the minimum regulating power is used in a small wind day, so that the whole-field regulation is limited by adopting a power reduction mode as much as possible, and the frequency of starting and stopping of a fan is reduced. According to the technical means, judging the current wind condition according to the average wind speed within the preset time of the grid-connected fan, and determining different minimum regulating powers according to different wind conditions, wherein different minimum regulating powers are adopted for different wind conditions; meanwhile, when judging the wind condition, two wind speed thresholds are set, and when the average wind speed is between the two wind speed thresholds, the previous wind condition is used, so that the wind condition back and forth change caused by wind speed fluctuation can be avoided.
In the embodiment of the application, the first minimum regulation power is the minimum regulation active power of the main control of the fan;
When the first minimum regulated power is greater than the power limit, the second minimum regulated power is the sum of the first minimum regulated power and the power margin; when the first minimum regulating power is smaller than the power limit value, the second minimum regulating power is the sum of the power limit value and the power allowance, wherein the power limit value is the power value which can be stably output by the fan when the pitch angle of the fan is opened to the maximum value of the regulating range at the wind speed limit value, and the wind speed limit value is determined according to the storm cut-out wind speed;
The second wind speed threshold value is the difference value between the wind speed limit value and the wind speed allowance; the first wind speed threshold value is the difference value between the second wind speed threshold value and the judging dead zone.
According to the technical means, different minimum adjusting powers and different wind speed thresholds can be determined according to the parameters of the fan, dead zones are judged at intervals between the second wind speed threshold and the first wind speed threshold, and the judged wind conditions are prevented from frequently fluctuating.
In the embodiment of the application, after determining the lowest adjustment power of each fan, the method further comprises the following steps: and adjusting the power of the grid-connected fans according to the wind farm dispatching instruction, the fan operation parameters and the lowest adjusting power of each fan so that the full-farm active power is the same as the wind farm dispatching instruction or the full-grid-connected fan active power is the same as the corresponding lowest adjusting power.
In the embodiment of the application, the power limiting shutdown is performed according to the wind farm dispatching instruction, the fan operation parameters and the minimum regulating power of each fan, and the method comprises the following steps:
And adjusting the power of the grid-connected fans according to the wind farm dispatching instruction, the fan operation parameters and the minimum adjusting power of each fan.
In the embodiment of the application, the grid-connected fan power is adjusted according to the wind farm dispatching instruction, the fan operation parameters and the lowest adjusting power of each fan, and the method comprises the following steps:
Calculating full-field active power of the grid-connected fans according to the current fan operation parameters;
calculating a first full-farm adjustment according to the full-farm active power and the wind farm scheduling instruction;
determining whether the grid-connected fans need to be subjected to power adjustment according to the fan operation parameters and the minimum adjustment power of the corresponding fans;
And determining a single-step adjusting value of the fan according to the full-field active power, the first full-field adjusting quantity and the corresponding minimum adjusting power, and controlling the fan to the corresponding fan for adjustment.
According to the technical means, the power of the grid-connected fans is adjusted according to the full-field active power and the wind power field scheduling instruction, so that the power limiting scheduling requirement is met in a power reducing mode, and the start and stop frequency of the fans is reduced.
In the embodiment of the application, determining the single-step adjusting value of the fan according to the wind farm dispatching instruction, the fan operating parameter and the corresponding minimum adjusting power comprises the following steps:
Calculating a theoretical adjustment quantity of a wind field according to the operation parameters of the fan:
；
Wherein, For the first full field adjustment quantity,/>K p is the proportionality coefficient, T I is the integration time constant, T d is the differential time constant,/>Scheduling instructions for wind farm given power,/>Is full field active power;
Calculating a single regulating value of each fan according to the theoretical regulating quantity of the wind field;
calculating a first difference value between the current power value of the fan and the corresponding lowest regulating power;
and determining a minimum value from the fan single-time adjustment value, the first difference value and the single-step length adjustment value as a fan single-step adjustment value.
According to the technical means, the single-step adjusting value of each fan can be obtained through calculation, the first difference value of the current power value of the fan and the corresponding minimum adjusting power, the single-step adjusting value of the fan and the minimum value determined in the single-step adjusting value are used as the single-step adjusting value of the fan, on one hand, the situation that the current power value of the fan is lower than the minimum adjusting power of the fan after adjustment can be avoided, on the other hand, the situation that the single-step adjusting amount is more and the stability of the fan is influenced can be avoided.
In the embodiment of the application, after adjusting the power of the grid-connected fan, the method further comprises the following steps: and carrying out power limiting shutdown according to the wind farm dispatching instruction, the fan operation parameters and the minimum regulating power of each fan.
In the embodiment of the application, the power limiting shutdown is performed according to the wind farm dispatching instruction, the fan operation parameters and the minimum regulating power of each fan, and the method further comprises the following steps:
determining a second full-field adjustment quantity according to the adjusted fan operation parameters under the condition that the active power of all grid-connected fans is equal to the corresponding minimum adjustment power and the full-field active power is larger than the wind power field scheduling instruction;
calculating the number of halts according to the second full-field adjustment quantity and the adjusted fan operation parameters;
and (3) down-controlling the shutdown instruction to the corresponding fan to finish shutdown adjustment.
According to the technical means, under the condition that the wind power plant dispatching instruction cannot be met in a power reduction mode, the power limiting mode is adopted to limit the power, and the wind power plant power is ensured to be identical with the wind power plant dispatching instruction.
In the embodiment of the application, the calculating of the number of shutdown stations according to the second full-field adjustment amount and the adjusted fan operation parameters comprises the following steps:
acquiring real-time active power of the first i grid-connected fans;
If the real-time active power of the first i grid-connected fans is smaller than the second full-field adjustment quantity, updating i=i+1, and returning to the previous step; otherwise, determining i as the number of halts.
According to the technical means, the number of fans needing to be stopped can be rapidly determined, and power-limiting stopping is rapidly realized.
In an embodiment of the present application, the method further includes:
and after the shutdown adjustment is completed, if the full-field active power is smaller than the wind power plant dispatching instruction, adjusting the grid-connected fan power according to the wind power plant dispatching instruction and the fan operation parameter until the full-field active power is the same as the wind power plant dispatching instruction.
According to the technical means, the power of the grid-connected fans is further adjusted, so that the fan power of the wind power plant accords with the power value given by the wind power plant dispatching instruction, and the dispatching requirement is met.
A second aspect of the application provides a wind farm power-limited shutdown system, the system comprising:
The data acquisition unit is used for acquiring a wind power plant dispatching instruction and fan operation parameters;
The minimum regulating power determining unit is used for determining the minimum regulating power of each fan according to the fan operation parameters;
The fan power adjusting unit is used for carrying out power limiting and stopping according to the wind power plant dispatching instruction, the fan operation parameters and the lowest adjusting power of each fan.
According to the technical means, the lowest regulating power is determined according to the fan operation parameters, and different lowest regulating powers are adopted as lower limits of power regulation under different wind conditions, so that the purpose of avoiding overlarge power limitation when the fan is opened for a long time on a large wind day is achieved, and the larger lowest regulating power is used, so that the whole-field regulation is easier to enter a shutdown mode to limit power, and meanwhile, the purpose of protecting the fan is achieved; the minimum regulating power is used in a small wind day, so that the whole-field regulation is limited by adopting a power reduction mode as much as possible, and the frequency of starting and stopping of a fan is reduced.
According to the technical scheme, aiming at different manifestations of power limitation of the heavy wind day and the light wind day, the heavy wind day and the light wind day are automatically identified, the power limitation of the energy management system to the lowest power set value of the fan is improved in order to avoid the overlarge power limitation of long-time pitch on the heavy wind day, and the whole-field adjustment is easier to enter a shutdown mode for power limitation. And the lowest power set value of the energy management system to the fan is reduced in a windy day, so that the full-field regulation can limit electricity in a power reduction mode as much as possible. Therefore, the fan can be protected from being opened and limited electricity for a long time in a high wind day, and can be prevented from being started and stopped excessively in a low wind day distinguishing adjustment mode, so that the shutdown adjustment is suitable for wind control.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of 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, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a wind farm power-limited shutdown method provided by an embodiment of the present invention;
FIG. 2 is a block diagram of a wind farm power-limiting shutdown system provided by an embodiment of the present invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the actual fan adjusting process, the problem that the lowest adjusting power of the energy management system cannot be adjusted by the fan, so that the following of full-field limited power is influenced, and the problem that the fan is frequently started and stopped after the set value of the lowest power is adjusted is solved, the two problems have obvious seasonal performance, such as large wind in winter and large wind power limit low-power operation has great harm to the fan; the power regulating device is more in the summer with small wind and is more suitable for reducing the frequency of starting, stopping and regulating power with lower power limit value.
For this differentiation phenomenon, the applicant thought that the solution is to automatically identify the heavy wind days and the light wind days, and to avoid too large limit of long-time pitching on the heavy wind days, to improve the lowest power set point of the energy management system to the fan, so that the whole-field adjustment is easier to enter into a shutdown mode for limiting electricity. And the lowest power set value of the energy management system to the fan is reduced in a windy day, so that the full-field regulation can limit electricity in a power reduction mode as much as possible.
FIG. 1 is a flow chart of a wind farm power-limited shutdown method provided by one embodiment of the invention. As shown in fig. 1, the method includes:
S1: and acquiring a wind power plant dispatching instruction and fan operation parameters. In the embodiment of the application, the wind power plant dispatching instruction comprises a wind power plant dispatching instruction given power, and the fan operation parameters at least comprise: fan speed, fan active power and grid-connected status. The given power of the wind farm scheduling instruction represents the target output power of the wind farm, namely the power which the adjusted wind farm should output. The grid-connected state of the blower indicates whether the corresponding blower is in the power adjustment range, if the grid-connected state is grid-connected, the corresponding blower needs to participate in the power adjustment, otherwise, the corresponding blower does not need to participate in the power adjustment; the active power of the fan can be used for calculating the power quantity which can be adjusted by the corresponding fan and the power quantity which needs to be adjusted by the wind farm; the wind speed of the fan can be used for judging the current wind condition of the fan. In addition, the fan operating parameters may also include active set points, pitch angles, and the like. These values are measured by the existing hardware of the wind turbine, and the method of the application can be obtained from the main control of the fan.
S2: and determining the lowest regulating power of each fan according to the fan operation parameters.
In the embodiment of the application, determining the minimum regulating power of each fan according to the fan operation parameters comprises the following steps:
Firstly, calculating the average value of wind speeds of all grid-connected fans within a preset time according to the fan operation parameters. In general, the preset duration is 10min, the average wind speed is calculated by using a moving average wind speed of 10min, and the average wind speed of the corresponding fans can be calculated according to the wind speed in the running parameters of each fan. The grid-connected fans are determined according to the grid-connected state of each fan.
Then comparing the wind speed average value with a wind speed threshold value, and if the wind speed average value is smaller than a first wind speed threshold value and the preset duration is continued, judging that the current wind condition is a small wind condition; if the average wind speed value is larger than the second wind speed threshold value and the preset duration is continued, judging that the current wind condition is a big wind condition; if the average wind speed is greater than or equal to the first wind speed threshold value and less than or equal to the second wind speed threshold value, the previous wind condition is taken as the current wind condition, and the second wind speed threshold value is greater than the first wind speed threshold value. If the judgment is carried out for the first time, the wind speed average value is located between the first wind speed threshold value and the second wind speed threshold value, and the wind condition is determined according to the setting. In actual setting, the initial value of the situation can be set according to the requirement, and the situation is used without the previous wind condition; in case there is a previous wind condition, the previous wind condition will be used as the current wind condition.
For example, when judging for the first time, the average wind speed is smaller than the first wind speed threshold value, and the preset time is continued, and the wind condition is judged to be a small wind condition, and when judging for the second time, the average wind speed is located between the first wind speed threshold value and the second wind speed threshold value, and at this time, the small wind condition of the previous time needs to be used as the current wind condition; similarly, if the average wind speed is greater than the second wind speed threshold value in the first judgment, and the preset time is continued, the wind condition is judged to be the high wind condition, and if the average wind speed is between the first wind speed threshold value and the second wind speed threshold value in the second judgment, the previous high wind condition needs to be used as the current wind condition.
For another example, when the set wind speed average value is between the first wind speed threshold value and the second wind speed threshold value, the initial state is a small wind condition; if the wind speed average value is between the first wind speed threshold value and the second wind speed threshold value in the first judgment, at the moment, the wind condition is determined to be a small wind condition.
In the embodiment of the application, the second wind speed threshold V m2 is the difference value between the wind speed limit V limit and the wind speed margin V ', V m2=Vlimit -V'; the first wind speed threshold V m1 is the difference between the second wind speed threshold V m2 and the judging dead zone S, and V m1=Vm2 -S, wherein the wind speed limit V limit is lower than the storm cut-out wind speed. And judging dead zones at intervals between the first wind speed threshold value and the second wind speed threshold value, and avoiding frequent fluctuation of judged wind conditions.
Under the condition of small wind, determining the first minimum regulating power of the corresponding fan as the minimum regulating power;
and under the condition of high wind, determining the second minimum regulating power of the corresponding fan as the lowest regulating power, wherein the second minimum regulating power is larger than the first minimum regulating power.
In the embodiment of the application, the first minimum adjustment power P min1 is the minimum adjustment active power of the main control of the fan;
When the first minimum regulated power is greater than the power limit (P min1>Plimit), the second minimum regulated power is the sum of the first minimum regulated power P min1 and the power margin δp: p min2=Pmin1 +δP; when the first minimum regulated power is less than the power limit (P min1<Plimit), the second minimum regulated power is the sum of the power limit and the power margin: and P min2=Plimit +δP, wherein the power limit value P limit is a power value which can be stably output by the fan when the pitch angle of the fan is opened to the maximum value of an adjusting range in the wind speed limit value V limit, the wind speed limit value is determined according to the storm cut-out wind speed, and the adjusting range of the pitch angle is equal to or less than 0-beta max,βmax and is equal to or less than the maximum pitch angle which can be stably and continuously adjusted by the main control pitch angle of the fan.
According to the technical means, judging the current wind condition according to the average wind speed within the preset time of the grid-connected fan, and determining different minimum regulating powers according to different wind conditions, wherein different minimum regulating powers are adopted for different wind conditions; meanwhile, when judging the wind condition, two wind speed thresholds are set, and when the average wind speed is between the two wind speed thresholds, the previous wind condition is used, so that the wind condition back and forth change caused by wind speed fluctuation can be avoided.
S3: and carrying out power limiting shutdown according to the wind farm dispatching instruction, the fan operation parameters and the minimum regulating power of each fan.
In one embodiment, power-limited shutdown is performed according to wind farm scheduling instructions, fan operating parameters, and minimum regulated power for each fan, comprising:
Firstly, calculating the full-field active power of the grid-connected fans according to the current fan operation parameters, wherein the full-field active power is the sum of the active power of all the grid-connected fans.
Then, a first full farm adjustment ΔP 1 is calculated based on the full farm active power P Real world and the wind farm schedule instructions. In an embodiment of the application, the first full-field adjustment is the difference between the full-field active power and the wind farm dispatch instruction given power P Feeding of , ΔP 1=P Feeding of －P Real world .
Finally, determining whether the grid-connected fan needs to be subjected to power adjustment according to the fan operation parameters and the minimum adjustment power of the corresponding fan, and in the embodiment of the application, determining whether the grid-connected fan needs to be subjected to power adjustment by comparing the active power of the fan with the minimum adjustment power of the fan, if the active power of the fan is larger than the minimum adjustment power of the fan, the fan needs to be subjected to power adjustment, otherwise, the power adjustment is not needed.
And determining a single-step adjusting value of the fan according to the full-field active power, the first full-field adjusting quantity and the corresponding minimum adjusting power, and controlling the fan to the corresponding fan for adjustment.
In the embodiment of the application, the single-step adjusting value of the fan is determined according to the following steps:
firstly, calculating a theoretical wind field regulating quantity according to a fan operation parameter:
；
Wherein, For the first full field adjustment quantity,/>K p is the proportionality coefficient, T I is the integration time constant, T d is the differential time constant,/>Scheduling instructions for wind farm given power,/>Is full field active power.
And then, calculating a single adjustment value of each fan according to the theoretical adjustment quantity of the wind field, wherein the single adjustment value of each fan is P delta/ni, and n i is the number of running wind turbines being adjusted.
Calculating a first difference value between the current power value of the fan and the corresponding lowest regulating power;
and determining a minimum value from the fan single-time adjustment value, the first difference value and the single-step length adjustment value as a fan single-step adjustment value.
According to the technical means, the single-step adjusting value of each fan can be obtained through calculation, the first difference value of the current power value of the fan and the corresponding minimum adjusting power, the single-step adjusting value of the fan and the minimum value determined in the single-step adjusting value are used as the single-step adjusting value of the fan, on one hand, the situation that the current power value of the fan is lower than the minimum adjusting power of the fan after adjustment can be avoided, on the other hand, the situation that the single-step adjusting amount is more and the stability of the fan is influenced can be avoided.
Because the active power of each fan is different, and the single-step adjustment value of the fan needs to be limited according to the single-step size and the minimum adjustment power, after one-step adjustment, the actual adjustment quantity may not meet the first full-field adjustment quantity DeltaP 1, the active power states of each fan are different, the minimum adjustment active power is achieved, and the minimum adjustment active power is not achieved, at this time, the three power adjustment steps can be repeated until the full-field active power is identical to the wind power field scheduling command, or the active power of all grid-connected fans is identical to the corresponding minimum adjustment power.
According to the technical means, the power of the grid-connected fans is adjusted according to the full-field active power and the wind power field scheduling instruction, the power limiting scheduling requirement is preferably met in a power reducing mode, and the start and stop frequency of the fans is reduced.
In another embodiment of the present application, the power limiting shutdown is performed according to the wind farm scheduling instruction, the fan operation parameters, and the minimum adjustment power of each fan, and further includes:
Determining a second full-field adjustment quantity according to the adjusted fan operation parameters under the condition that the active power of all grid-connected fans is equal to the corresponding minimum adjustment power and the full-field active power is larger than the wind power field scheduling instruction; the calculation mode of the second full-field adjustment quantity is the same as that of the first full-field adjustment quantity, and at this time, the active power of each grid-connected fan after adjustment and the given power of the wind power plant dispatching instruction are required to be used for calculating the second full-field adjustment quantity DeltaP 2.
Calculating the number of shutdown stations according to the second full-field adjustment amount and the adjusted fan operation parameters, and specifically comprising:
acquiring real-time active power of the first i grid-connected fans;
If the real-time active power of the first i grid-connected fans is smaller than the second full-field adjustment quantity, updating i=i+1, and returning to the previous step; otherwise, determining i as the number of halts.
For example, if the real-time active power of the first 2 grid-connected fans is smaller than Δp 2, i=2+1=3 is updated, then the real-time active power of the first 3 grid-connected fans is determined, and if the real-time active power of the first 3 grid-connected fans is greater than or equal to Δp 2, the number of shutdown units is determined to be 3.
According to the technical means, the number of fans needing to be stopped can be rapidly determined, and power-limiting stopping is rapidly realized.
And (3) down-controlling the shutdown instruction to the corresponding fan to finish shutdown adjustment.
According to the technical means, the minimum regulating power is determined according to the fan operation parameters, different minimum regulating powers are adopted as the lower limit of power regulation under different wind conditions, larger minimum regulating power is used in a windy day, and a single fan can achieve larger minimum regulating power without too large opening, so that the opening angle is reduced in the windy day, the situation that the opening angle is too large for a long time in order to achieve the power limiting is avoided, and after each fan achieves the larger minimum regulating power, the power limiting can be carried out in a shutdown mode, so that the whole-field regulation is easier to enter the shutdown mode for limiting, and the purpose of protecting the fan is achieved; the small minimum regulating power is used in a small wind day, a single fan can achieve the small minimum regulating power by opening more paddles, the whole-field power can be reduced more, the whole-field regulation adopts a power reduction mode as much as possible to limit electricity, the shutdown quantity is relatively reduced, and therefore the frequency of starting and stopping of the fan is reduced.
In an embodiment of the present application, the method further includes:
And after the shutdown adjustment is completed, if the full-field active power is smaller than the wind power plant dispatching instruction, adjusting the grid-connected fan power according to the wind power plant dispatching instruction and the fan operation parameter until the full-field active power is the same as the wind power plant dispatching instruction. If the number of the shutdown stations is 3, if the real-time active power of the 3 grid-connected fans is greater than DeltaP 2, the reduction amount of the full-field active power is greater than the second full-field adjustment amount after the 3 grid-connected fans are stopped, and the power of the still-running grid-connected fans needs to be increased so that the full-field active power of the grid-connected fans accords with the given power of the wind power plant dispatching instruction. Specifically, the power may be increased according to the power adjustment step described above.
According to the technical means, the power of the grid-connected fans is further adjusted, so that the fan power of the wind power plant accords with the power value given by the wind power plant dispatching instruction, and the dispatching requirement is met.
A second aspect of the present application provides a wind farm power-limited shutdown system, as shown in fig. 2, the system comprising:
The data acquisition unit is used for acquiring a wind power plant dispatching instruction and fan operation parameters;
The minimum regulating power determining unit is used for determining the minimum regulating power of each fan according to the fan operation parameters;
And the fan power adjusting unit is used for carrying out power limiting and stopping according to the wind power plant dispatching instruction, the fan operation parameters and the minimum adjusting power of each fan.
In some embodiments, the fan power adjustment unit includes:
the fan power adjusting module is used for adjusting grid-connected fan power according to the wind power plant dispatching instruction, the fan operation parameters and the lowest adjusting power of each fan;
The second full-field adjustment amount calculation module is used for determining a second full-field adjustment amount according to the adjusted fan operation parameters under the condition that the active power of all grid-connected fans is equal to the corresponding minimum adjustment power and the full-field active power is larger than the wind power plant scheduling instruction;
The shutdown number calculation module is used for calculating the shutdown number according to the second full-field adjustment quantity and the adjusted fan operation parameters;
And the instruction issuing module is used for issuing a shutdown instruction to the corresponding fan to finish shutdown adjustment.
According to the technical means, the lowest regulating power is determined according to the fan operation parameters, and different lowest regulating powers are adopted as lower limits of power regulation under different wind conditions, so that the purpose of avoiding overlarge power limitation when the fan is opened for a long time on a large wind day is achieved, and the larger lowest regulating power is used, so that the whole-field regulation is easier to enter a shutdown mode to limit power, and meanwhile, the purpose of protecting the fan is achieved; the minimum regulating power is used in a small wind day, so that the whole-field regulation is limited by adopting a power reduction mode as much as possible, and the frequency of starting and stopping of a fan is reduced.
A third aspect of the application provides a machine-readable storage medium having stored thereon instructions for causing a machine to perform the method of wind farm power-limiting shutdown.
Those skilled in the art will appreciate that all or part of the steps in a method for implementing the above embodiments may be implemented by a program stored in a storage medium, where the program includes several instructions for causing a single-chip microcomputer, chip or processor (processor) to perform all or part of the steps in a method according to the embodiments of the invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The alternative embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the embodiments of the present invention within the scope of the technical concept of the embodiments of the present invention, and all the simple modifications belong to the protection scope of the embodiments of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of embodiments of the invention are not described in detail.
In addition, any combination of the various embodiments of the present invention may be made, so long as it does not deviate from the idea of the embodiments of the present invention, and it should also be regarded as what is disclosed in the embodiments of the present invention.

Claims (10)

1. A method for power-limited shutdown of a wind farm, the method comprising:
Acquiring a wind power plant dispatching instruction and fan operation parameters; the wind power plant dispatching instruction comprises a wind power plant dispatching instruction given power, and the fan operation parameters at least comprise fan wind speed, fan active power and grid connection state;
determining the lowest regulating power of each fan according to the fan operation parameters, including:
calculating the average value of wind speeds of all grid-connected fans within a preset time period according to the fan operation parameters;
Comparing the wind speed average value with a wind speed threshold value, and if the wind speed average value is smaller than a first wind speed threshold value and the preset duration is continued, judging that the current wind condition is a small wind condition; if the average wind speed value is larger than the second wind speed threshold value and the preset duration is continued, judging that the current wind condition is a big wind condition; the second wind speed threshold value is greater than the first wind speed threshold value;
Under the condition of small wind, determining the first minimum regulating power of the corresponding fan as the minimum regulating power; and under the condition of high wind, determining the second minimum regulating power of the corresponding fan as the lowest regulating power, wherein the second minimum regulating power is larger than the first minimum regulating power.
2. The method of power-limited shutdown of a wind farm of claim 1, wherein the first minimum regulated power is a fan master minimum regulated active power;
When the first minimum regulated power is greater than the power limit, the second minimum regulated power is the sum of the first minimum regulated power and the power margin;
When the first minimum regulated power is less than the power limit, the second minimum regulated power is the sum of the power limit and the power margin,
The power limit value is a power value which can be stably output by the fan when the pitch angle of the fan is opened to the maximum value of the adjusting range when the wind speed limit value of the fan is set, and the wind speed limit value is determined according to the storm cut-out wind speed;
The second wind speed threshold value is the difference value between the wind speed limit value and the wind speed allowance; the first wind speed threshold value is the difference value between the second wind speed threshold value and the judging dead zone.
3. The method of power-limited shutdown of a wind farm according to claim 1 or 2, further comprising, after determining the lowest regulated power for each fan:
And adjusting the power of the grid-connected fans according to the wind farm dispatching instruction, the fan operation parameters and the lowest adjusting power of each fan so that the full-farm active power is the same as the wind farm dispatching instruction or the full-grid-connected fan active power is the same as the corresponding lowest adjusting power.
4. A wind farm power limit shutdown method according to claim 3, wherein adjusting grid-tie fan power based on wind farm scheduling instructions, fan operating parameters, and minimum adjustment power for each fan comprises:
Calculating full-field active power of the grid-connected fans according to the current fan operation parameters;
calculating a first full-farm adjustment according to the full-farm active power and the wind farm scheduling instruction;
determining whether the grid-connected fans need to be subjected to power adjustment according to the fan operation parameters and the minimum adjustment power of the corresponding fans;
And determining a single-step adjusting value of the fan according to the full-field active power, the first full-field adjusting quantity and the corresponding minimum adjusting power, and controlling the fan to the corresponding fan for adjustment.
5. The method of power-limited shutdown of a wind farm of claim 4, wherein determining a single step adjustment value for the wind turbine based on the wind farm scheduling command, the wind turbine operating parameters, and the corresponding minimum adjustment power comprises:
Calculating a theoretical adjustment quantity of a wind field according to the operation parameters of the fan:
；
Wherein, For the first full field adjustment quantity,/>K p is the proportionality coefficient, T I is the integration time constant, T d is the differential time constant,/>Scheduling instructions for wind farm given power,/>Is full field active power;
Calculating a single regulating value of each fan according to the theoretical regulating quantity of the wind field;
calculating a first difference value between the current power value of the fan and the corresponding lowest regulating power;
and determining a minimum value from the fan single-time adjustment value, the first difference value and the single-step length adjustment value as a fan single-step adjustment value.
6. The method of power-limited shutdown of a wind farm of claim 5, further comprising, after adjusting the grid-tie fan power: and carrying out power limiting shutdown according to the wind farm dispatching instruction, the fan operation parameters and the minimum regulating power of each fan.
7. The method of power-limited shutdown of a wind farm according to claim 6, wherein the power-limited shutdown according to wind farm scheduling instructions, fan operating parameters, and minimum regulated power for each fan comprises:
determining a second full-field adjustment quantity according to the adjusted fan operation parameters under the condition that the active power of all grid-connected fans is equal to the corresponding minimum adjustment power and the full-field active power is larger than the wind power field scheduling instruction;
calculating the number of halts according to the second full-field adjustment quantity and the adjusted fan operation parameters;
and (3) down-controlling the shutdown instruction to the corresponding fan to finish shutdown adjustment.
8. The method of power-limited shutdown of a wind farm according to claim 7, wherein calculating the number of shutdown based on the second full farm adjustment and the adjusted fan operating parameter comprises:
acquiring real-time active power of the first i grid-connected fans;
If the real-time active power of the first i grid-connected fans is smaller than the second full-field adjustment quantity, updating i=i+1, and returning to the previous step; otherwise, determining i as the number of halts.
9. The wind farm power limiting shutdown method of claim 7, further comprising:
and after the shutdown adjustment is completed, if the full-field active power is smaller than the wind power plant dispatching instruction, adjusting the grid-connected fan power according to the wind power plant dispatching instruction and the fan operation parameter until the full-field active power is the same as the wind power plant dispatching instruction.
10. A wind farm power-limited shutdown system, the system comprising:
The data acquisition unit is used for acquiring a wind power plant dispatching instruction and fan operation parameters;
The minimum regulating power determining unit is used for determining the minimum regulating power of each fan according to the fan operation parameters;
And the fan power adjusting unit is used for carrying out power limiting and stopping according to the wind power plant dispatching instruction, the fan operation parameters and the minimum adjusting power of each fan.
CN202410113600.2A 2024-01-26 2024-01-26 Wind power plant power limiting shutdown method and system Pending CN118008688A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410113600.2A CN118008688A (en) 2024-01-26 2024-01-26 Wind power plant power limiting shutdown method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410113600.2A CN118008688A (en) 2024-01-26 2024-01-26 Wind power plant power limiting shutdown method and system

Publications (1)

Publication Number Publication Date
CN118008688A true CN118008688A (en) 2024-05-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN118008688A (en)

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