CN111835032B - Control method, system, medium and electronic equipment of wind power plant - Google Patents
Control method, system, medium and electronic equipment of wind power plant Download PDFInfo
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- CN111835032B CN111835032B CN202010729587.5A CN202010729587A CN111835032B CN 111835032 B CN111835032 B CN 111835032B CN 202010729587 A CN202010729587 A CN 202010729587A CN 111835032 B CN111835032 B CN 111835032B
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- 238000000034 method Methods 0.000 title claims abstract description 78
- 238000010248 power generation Methods 0.000 claims abstract description 26
- 238000012216 screening Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims description 46
- 230000009467 reduction Effects 0.000 claims description 38
- 238000012163 sequencing technique Methods 0.000 claims description 31
- 238000004590 computer program Methods 0.000 claims description 11
- 238000011217 control strategy Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000005059 dormancy Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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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Abstract
The invention discloses a control method, a control system, a control medium and electronic equipment of a wind power plant. The control method of the wind power plant comprises the following steps: s100: screening controllable fans which are not affected by sector management; s201: judging whether the real-time utilization rate of the wind farm is greater than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind farm, if so, executing step 210; s210: starting a new controllable fan; the real-time utilization rate of the wind power plant is the ratio of the sum of the active power target value of the wind power plant and the available power of the started fan. The control method and the control system can make a control strategy capable of reasonably distributing the power generation tasks of each fan to the greatest extent in a short time.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a control method, a control system, a control medium and electronic equipment of a wind power plant.
Background
Wind energy is a clean energy source, has considerable attraction at present with deficient resources and increasingly prominent environmental problems, and is a development trend of the electric power industry to replace traditional coal burning and fuel oil thermal power by utilizing the wind power generation technology. The wind power generation has the advantages of cleanness and good environmental benefit; wind energy can be regenerated and never exhausted; the construction period is short; flexible installation scale, low operation and maintenance cost and the like.
Although wind power generation has various advantages, the wind power generation set is usually built in mountain areas or plateau areas with complex environmental factors, so that the running condition of the wind power generation set is bad and is easily influenced by large turbulence, and the condition of power generation overrun easily occurs in the power generation process of the wind power generation set. Therefore, a SCADA (Supervisory Control And Data Acquisition) system, i.e. a data acquisition and monitoring control system, is generally used in the prior art to manually set or receive power grid dispatching instructions for performing unit start-stop control.
However, the existing start-stop control mode of the wind farm has the following problems:
1. the reaction of the mode to the power grid dispatching instruction is relatively slow;
2. a control strategy capable of reasonably distributing the power generation tasks of each fan to the greatest extent cannot be made in a short time;
3. the health of the fans is not considered.
Therefore, a new wind farm start-stop control method is expected, and the wind farm can automatically start and stop the fan by adopting an optimal control strategy by combining the natural conditions of the sector, the power grid dispatching instruction and the state value fed back by the wind farm, so that the power grid dispatching instruction is met, and the redundancy of power generation of the wind farm is ensured.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a control method, a control system, a control medium and electronic equipment for a wind power plant.
The invention solves the technical problems by the following technical scheme:
a method of controlling a wind farm comprising the steps of:
s100: screening controllable fans which are not affected by sector management;
s201: judging whether the real-time utilization rate of the wind farm is greater than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind farm, if so, executing step 210;
s210: judging whether to start the controllable fan in a stop state;
the real-time utilization rate of the wind power plant is the ratio of the sum of the active power target value of the wind power plant and the available power of the started fan.
In the scheme, on the basis of sector management, whether the real-time utilization rate of the wind farm is too high or not is judged, namely whether the sum of available power of started fans is too low or not, and under proper conditions, the controllable fans in a shutdown state are started to make up for the deficiency of the available power of the fans.
Preferably, step S100 includes:
step S101: judging whether the local time is in the time of sector management work or not, if not, the fan is a controllable fan; if yes, executing step S102;
Step S102: judging whether the fan is at an applicable angle of sector management or not; if yes, executing step S103; if not, judging that the fan is a controllable fan;
step S103: judging whether the power reduction predicted value of the fan caused by sector management is larger than a power reduction preset value preset by a wind power plant, if not, judging that the fan is a controllable fan; if yes, judging that the fan is not a controllable fan.
In the scheme, the controllable fan can be screened out through the working time of sector management, the applicable angle of sector management and the power reduction amount of the fan.
Preferably, in step S103, if it is determined that the predicted value of the power reduction amount of the fan caused by the sector management is greater than the preset value of the power reduction amount preset in the wind farm, the following operations are performed: if the fan is in a stop state, stopping is continued, and if the fan is in a power generation state, stopping is required.
In this scheme, the preset value of the power reduction amount of the wind farm is generally a value that enables the fan to effectively operate, and if the power reduction amount of the fan is too large due to sector management, the fan keeps an operation state and causes excessive loss, so that the fan is stopped, and unnecessary loss is avoided.
Preferably, in step S201,
if it is determined that the real-time utilization rate of the wind farm is greater than the sum of the minimum utilization rate and the lag utilization rate of the wind farm, step S202 is executed: judging whether a controllable fan in the starting process exists or not,
if yes, after the controllable fan in the starting process is started, repeating the step S201;
if not, step S210 is performed.
In the scheme, before the fan in the shutdown state is started, whether the real-time power of the wind power plant reaches the steady state or is fluctuating is firstly confirmed, so that the real-time utilization rate of the wind power plant is accurately judged.
Preferably, step S210 includes the steps of:
s211: selecting a controllable fan to be started;
s215: judging whether the new utilization rate Pi of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
if yes, starting the selected controllable fan, and repeating the step S201;
wherein the new utilization rate Pi of the wind power plant is the ratio of the active power target value of the wind power plant to Pti, and Pti is the sum of the available active power of the started fans and the sum of the available active power of the controllable fans to be started.
In the scheme, before the controllable fan in the shutdown state is started, whether the wind power plant new utilization rate Pi is still more than or equal to the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant is further judged, if the wind power plant new utilization rate Pi is still more than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant after the controllable fan in the shutdown state is started, the situation that the fan needs to be started and whether the fan in the shutdown state still needs to be started is still needed to be continuously judged.
Preferably, step S211 includes the steps of:
s212: sequencing the controllable fans according to the off-grid time, wherein the controllable fans with long off-grid time are arranged in front, and the controllable fans with short off-grid time are arranged behind;
s214: and selecting the controllable fans arranged at the forefront end as controllable fans to be started according to the arranged sequence.
In the scheme, the controllable fan to be started is selected, and the fan with longer off-grid time is selected, so that the dormancy time of the fan is prolonged, and the situation that a certain fan is vulnerable to long-term use is avoided.
Preferably, step S211 further comprises the steps of:
s213: judging whether the controllable fans arranged at the forefront end have no faults,
if yes, go to step S214,
if not, the controllable fan is removed from the arranged sequence, and step S212 is repeated.
In the scheme, before the controllable fan in the shutdown state is started, the controllable fan is checked, and the controllable fan is started without faults, so that the situation that the active power of the wind power plant cannot reach an expected value due to the fact that the faulty fan is started is avoided.
Preferably, in step S201,
if it is determined that the real-time utilization rate of the wind farm is not greater than the sum of the minimum utilization rate and the lag utilization rate of the wind farm, step S204 is executed: judging whether the real-time utilization rate of the wind power plant is smaller than the minimum utilization rate of the wind power plant,
If yes, go to step 220: and stopping a controllable fan in operation.
In the scheme, after judging that the sum of the available powers of the started fans is not too low, further judging whether the sum of the available powers of the started fans is too high or not, wherein the sum of the available powers of the started fans is too high, so that one running fan has to be stopped.
Preferably, in step S201,
if it is determined that the real-time utilization rate of the wind farm is not greater than the sum of the minimum utilization rate and the lag utilization rate of the wind farm, step S203 is executed: judging whether a controllable fan in the shutdown process exists or not,
if so, after waiting for the shutdown of the controllable fan in the shutdown process, repeating the step S201,
if not, step S204 is performed: and judging whether the real-time utilization rate of the wind power plant is smaller than the minimum utilization rate of the wind power plant.
In the scheme, before stopping a fan, whether the real-time power of the wind power plant reaches a stable state or is fluctuating is firstly confirmed, so that the real-time utilization rate of the wind power plant is accurately judged.
Preferably, step S220 includes the steps of:
s221: selecting a controllable fan to be stopped;
s222: judging whether the new utilization rate Ps of the wind power plant is less than 1,
If yes, controlling the selected controllable fan to stop, and repeating the step S201;
wherein the wind farm new utilization Ps is the ratio of the wind farm active power target value to Pts, which is the difference between the sum of the available active power of the started fans and the available active power of the controllable fans to be shut down.
In the scheme, before stopping the selected controllable fan, judging whether stopping of the controllable fan can cause the wind power plant new utilization rate Ps to be too large, and if the wind power plant new utilization rate Ps is still smaller than 1 after stopping the controllable fan, indicating that the controllable fan can be stopped.
Preferably, in step S221,
sequencing the controllable fans according to the grid connection time, sequencing the controllable fans with long grid connection time before the controllable fans with short grid connection time after the controllable fans with short grid connection time, and selecting the controllable fans which are sequenced at the forefront end as the controllable fans to be stopped according to the sequenced sequences.
In the scheme, the fan with longer grid connection time is selected to stop so as to prolong the dormancy time of the fan and avoid the damage caused by long-term use of a certain fan.
A control system for a wind farm, comprising:
the control module is used for controlling the start and stop of a fan in the wind power plant;
The screening module is used for screening controllable fans which are not affected by sector management in the wind power plant; and
a first judging module for judging whether the real-time utilization rate of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
if yes, a control module is called to start the controllable fan in a stop state;
the real-time utilization rate of the wind power plant is the ratio of the active power target value of the wind power plant to the sum of the available power of the started fans.
Preferably, the screening module includes: the device comprises a first judging unit, a second judging unit and a third judging unit;
the first judging unit is used for judging whether the local time is in the time of sector management work,
if not, the fan is a controllable fan,
if yes, calling the second judging unit;
the second judging unit is used for judging whether the fan is at an applicable angle for sector management,
if the second judging unit judges that the fan is not at the applicable angle of sector management, the fan is a controllable fan,
if the second judging unit judges that the fan is at the applicable angle of sector management, the third judging unit is called;
the third judging unit is used for judging whether the predicted value of the power reduction amount of the fan caused by sector management is larger than the preset value of the power reduction amount of the wind farm,
If so, the fan is not a controllable fan,
if not, the fan is a controllable fan.
Preferably, if the third judging unit judges that the predicted value of the power reduction amount of the fan caused by sector management is greater than the preset value of the power reduction amount of the wind farm, the control module is invoked to control the fan to stop.
Preferably, the control system further comprises: a starting-up process judging module;
the starting-up process judging module is used for judging whether a controllable fan in the starting process exists or not after the first judging module judges that the real-time utilization rate of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
if yes, after the controllable fan in the starting process is started, the first judging module is called again,
if not, the control module is called to start the controllable fan in the stop state.
Preferably, the control system further comprises:
the starting-up selection module is used for selecting a controllable fan to be started; and
the second judging module is used for judging whether the new utilization rate Pi of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant, if yes, the control module is called to start the controllable fan selected by the starting selection module, and then the first judging module is called again;
Wherein the new utilization rate Pi of the wind power plant is the ratio of the active power target value of the wind power plant to Pti, and Pti is the sum of the available active power of the started fans and the sum of the available active power of the controllable fans to be started.
Preferably, the power-on selection module includes:
the startup sequencing unit is used for sequencing the controllable fans, the controllable fans with long off-grid time are arranged in front, and the controllable fans with short off-grid time are arranged behind; and
the starting-up selection unit is used for selecting the controllable fans arranged at the forefront end as the controllable fans to be started according to the sequencing of the sequencing module.
Preferably, the power-on selection module further includes: a fault judging unit and a rejecting unit;
the fault judging unit is used for judging whether the controllable fans arranged at the forefront end have no faults,
if yes, the starting-up selection unit is called,
if not, the rejecting unit is called to reject the controllable fans arranged at the forefront end in the arranged sequence, and the starting sequencing unit is called again.
Preferably, the control system further comprises: a third judging module;
the third judging module is used for judging whether the real-time utilization rate of the wind power plant is smaller than the minimum utilization rate of the wind power plant when the first judging module judges that the real-time utilization rate of the wind power plant is not larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
If yes, the control module is called to stop a controllable fan in operation.
Preferably, the control system further comprises a shutdown process judging module;
the shutdown process judging module is used for judging whether a controllable fan in the shutdown process exists or not after the first judging module judges that the real-time utilization rate of the wind power plant is not more than the sum of the minimum utilization rate and the lag utilization rate of the wind power plant,
if so, after the controllable fan in the stopping process is stopped, the first judging module is called again,
and if not, calling the third judging module.
Preferably, the control system further comprises: a shutdown selection module and a fourth judgment module;
the shutdown selection module is used for selecting a controllable fan to be shutdown;
the fourth judging module is used for judging whether the new utilization rate Ps of the wind power plant is smaller than 1,
if yes, the control module is called to stop the controllable fan selected by the shutdown selection module, and then the first judgment module is called again;
wherein the new utilization rate Ps of the wind farm is the sum of the active power target value of the wind farm and Pts, and Pts is the difference between the sum of the available active power of the started fans and the available active power of the controllable fans to be stopped.
Preferably, the shutdown selection module further comprises: the machine comprises a machine stop sequencing unit and a machine stop selecting unit;
the shutdown sequencing unit is used for sequencing the controllable fans according to the grid connection time, wherein the controllable fans with long grid connection time are arranged in front, and the controllable fans with short grid connection time are arranged in back;
the shutdown selecting unit is used for selecting the controllable fans which are arranged at the forefront end in the sequence arranged by the shutdown sequencing unit as controllable fans to be shutdown.
An electronic device, comprising a memory: a processor and a computer program stored on a memory and executable on the processor, which processor, when executing the computer program, implements the steps of the method of controlling a wind farm as described above.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a method of controlling a wind farm as described above.
The invention has the positive progress effects that: the control method of the wind power plant comprises two signal sources: one is sector management (Sector Management, SM) for determining, based on the local time and the location of each fan nacelle in the wind farm, whether the sector management suppresses the amount of power reduction caused by the fan output to be large enough to disable the fan or to be forced to shut down (due to excessive reduction resulting in inefficiency); another signal source is a power reference value distributor (Power reference Distributor, PRD) that determines whether a fan should be started or stopped in a later state based on power grid scheduling instructions and the status values fed back by the wind farm fans. Thus, a control strategy capable of reasonably distributing the power generation tasks of each fan to the greatest extent can be made in a short time. (definition of the Power reference allocator may be found in the description of the examples section)
Drawings
Fig. 1 is a general flow chart of a control method according to embodiment 1 of the present invention.
Fig. 2 is a flow chart of step 100 according to embodiment 1 of the present invention.
Fig. 3 is a flow chart of step 200 according to embodiment 1 of the present invention.
Fig. 4 is a flow chart of step 210 according to embodiment 1 of the present invention.
Fig. 5 is a flow chart of step 220 of embodiment 1 according to the present invention.
Fig. 6 is a block diagram of the control system according to embodiment 2 of the present invention.
Fig. 7 is a schematic structural diagram of an electronic device according to embodiment 3 of the present invention.
Reference numerals illustrate:
electronic equipment 2
Processor 3
Memory 4
RAM 41
Cache memory 42
ROM 43
Program modules 44
Program tool 45
Bus 5
External device 6
I/O interface 7
Network adapter 8
Control system 100
First judgment module 101
Second judgment module 102
Third judging module 103
Fourth judgment module 104
Screening module 110
First judgment unit 111
The second judging unit 112
Third judging unit 113
Boot selection module 120
Boot ordering unit 121
Fault determination unit 122
Boot selection unit 123
Rejection unit 124
Shutdown selection module 130
Shutdown sequencing unit 131
Shutdown selection unit 132
Boot process determination module 140
Shutdown process determination module 150
Control module 160
Detailed Description
The invention will be further illustrated by way of example with reference to the accompanying drawings, without thereby limiting the scope of the invention to the examples.
Example 1
The embodiment provides a control method of a wind power plant, which has two signal sources: one is sector management (Sector Management, SM) for determining, based on the local time and the location of each fan nacelle in the wind farm, whether the sector management suppresses the amount of power reduction caused by the fan output to be large enough to disable the fan or to be forced to shut down (due to excessive reduction resulting in inefficiency); another signal source is a power reference value distributor (Power reference Distributor, PRD) that determines whether a fan should be started or stopped in a later state based on power grid scheduling instructions and state values fed back from the wind farm fans. Thus, a control strategy capable of reasonably distributing the power generation tasks of each fan to the greatest extent can be made in a short time.
The power reference value distributor herein may be a virtual functional module, which is used to calculate a real-time active power reference value (real-time active power target value) and a reactive power reference value of each fan, and determine whether to start or stop the fan according to the running condition of the whole wind farm, where the functional module may be a program stored in a control device of an electronic device or a readable storage medium of a computer. The power reference value allocator may also be understood as an entity device installed in an electronic device or a computer, such as a controller or the like, which may be a PLC, a CPU, or the like.
The sector management technology is to implement feathering and shutdown operations on a set of a wind farm in a certain time period, a wind direction period and a wind speed period, reduce the harm of a special wind condition on a certain wind direction to a fan, and ensure the safe operation of the fan at the cost of reducing the generated energy.
As shown in fig. 1 to 5, the control method includes the steps of:
s100, screening controllable fans which are not affected by sector management;
s200, controlling the start and stop of the controllable fan.
It will be appreciated by those skilled in the art that the controllable wind turbine in this embodiment refers to a wind turbine in a wind farm that is screened out to be controlled by the power reference distributor, and is not a wind turbine that can be controlled in a broad sense.
In an embodiment of the present invention, as shown in fig. 2, step S100 includes the following steps:
s101, judging whether the local time is at the time of sector management work,
in an embodiment of the present invention, if the local time is in the sector management working time, that is, the sector management start time < local time < sector management close time, step S102 is executed;
if the local time is not in the sector management working time of the fan, indicating that the fan is not affected by sector management at the moment, the fan is a controllable fan, the fan is scheduled through a power reference value distributor, and the sector management working time of each fan is respectively set;
S102, judging whether the fan is at an applicable angle for sector management according to a start angle, an end angle, a hysteresis angle and a fan cabin position of the sector management;
in an embodiment of the present invention, the judging method is as follows:
if (start angle-retard angle) < (end angle + retard angle),
in this case, if (start angle-lag angle) < fan nacelle position < (end angle + lag angle),
representing that the fan is in the applicable angle of sector management, otherwise, representing that the fan is not in the applicable angle of sector management;
if (start angle-retard angle) is not less than (end angle + retard angle),
in this case, if the fan nacelle position is not less than (start angle-retard angle) or the fan nacelle position is < (end angle + retard angle),
representing that the fan is in the applicable angle of sector management, or else, representing that the fan is not in the applicable angle of sector management,
wherein the start angle, the lag angle and the end angle are all angles of the fan cabin;
if the fan is at the applicable angle of sector management, executing step S103;
if the fan is not at the applicable angle of sector management, the fan is a controllable fan;
s103, judging whether the predicted value of the power reduction amount of the fan caused by sector management is larger than the preset value of the power reduction amount of the wind power plant,
If the predicted value of the power reduction amount of the fan caused by sector management is not greater than the preset value of the power reduction amount of the wind power plant, the fan is a controllable fan,
if the predicted value of the power reduction amount of the fan caused by sector management is larger than the preset value of the power reduction amount of the wind power plant, the fan is not a controllable fan.
In step S103, if it is determined that the predicted value of the power reduction amount of the fan caused by the sector management is greater than the preset value of the power reduction amount of the wind farm, the following operations are performed: if the fan is in a shutdown state, the fan is required to be stopped continuously, and if the fan is in a power generation state, the fan is required to be stopped immediately.
The preset value of the power reduction amount preset by the wind power plant is a value which enables the fan to effectively operate, if the power reduction amount of the fan is too large due to sector management, the fan keeps an operating state and can cause excessive loss, so that the fan is stopped, and unnecessary loss is avoided.
In one embodiment of the present invention, at least one of the following judgment formulas is used in step S200:
formula (1): the real-time utilization rate of the wind power plant is greater than the minimum utilization rate and the hysteresis utilization rate of the wind power plant;
wherein, wind farm real-time utilization = wind farm active power target value +.f. sum of available power of started fans;
The minimum utilization rate and the hysteresis utilization rate of the wind power plant are directly set by the wind power plant, for example, the minimum utilization rate of the wind power plant is set to 40%, and the hysteresis utilization rate is set to 20%, so 60% is the power generation output ratio of each fan under ideal conditions (namely, the current wind speed can lead one fan to generate 10MW at most, and the actual power generation of the fan is 6MW at the moment, so that a new fan is not needed to participate in power generation). If the sum of the two parameters is 1.0, all the fans which are on generate electricity at full power, and no redundancy exists.
Formula (2): wind farm new utilization Pi > wind farm minimum utilization + lag utilization, wherein wind farm new utilization Pi = wind farm active power target value +.pti, pti = sum of available active power of started fans + available active power of controllable fans to be turned on.
Formula (3): the real-time utilization rate of the wind power plant is less than the minimum utilization rate of the wind power plant.
Formula (4): the new utilization rate Ps of the wind power plant is less than 1;
where wind farm new utilization ps=wind farm active power target value +.pts, pts=sum of available active power of started fans-available active power of controllable fans to be shut down.
As shown in fig. 3, step S200 includes the steps of:
s201, judgment formula (1): whether the real-time utilization rate of the wind power plant is greater than the minimum utilization rate of the wind power plant and the hysteresis utilization rate are established,
If the formula (1) is satisfied, step S202 is executed: judging whether a controllable fan in the starting process exists or not,
if the controllable fan in the starting process exists, repeating the step S201 after the controllable fan in the starting process is waited to be started;
if there is no controllable fan in the starting process, step S210 is executed: judging whether a new controllable fan is started. The new controllable fan is the controllable fan in a stop state.
Before a new controllable fan is started, whether the real-time power of the wind power plant reaches a stable state or not is confirmed, and whether the real-time power of the wind power plant is fluctuating is confirmed, so that the real-time utilization rate of the wind power plant is accurately judged.
If equation (1) is true, it represents that the real-time utilization rate of the wind farm may be too high, i.e. the sum of the available powers of the started fans is insufficient, at which time, starting a new controllable fan is considered to increase the sum of the available powers of the running fans, i.e. the real-time utilization rate of the wind farm is reduced.
As shown in fig. 4, step S210 includes the steps of:
s211, selecting a new controllable fan to be started;
step S211 includes the steps of:
s212: sequencing the controllable fans according to the off-grid time, wherein the controllable fans with long off-grid time are arranged in front, and the controllable fans with short off-grid time are arranged behind; the off-grid time is the downtime of the fan;
Selecting a controllable fan to be started, and selecting a fan with longer off-grid time to prolong the dormancy time of the fan, so as to avoid the damage of a certain fan caused by long-term use;
s213: judging whether the controllable fans arranged at the forefront end have faults or not, if so, executing the step S214, if not, eliminating the controllable fans from the arranged sequence, and repeating the step S212;
before a new fan is started, the new fan is checked and started without faults, so that the situation that the active power of a wind power plant cannot reach an expected value due to the fact that the faulty fan is started is avoided;
s214: selecting a controllable fan arranged at the forefront end as a new controllable fan to be started according to the arranged sequence;
s215: judgment formula (2): whether the new utilization rate Pi of the wind power plant is greater than the minimum utilization rate and the hysteresis utilization rate of the wind power plant are established,
if the formula (2) is satisfied, starting a selected new controllable fan, resetting the off-grid time of the selected new controllable fan to zero, and repeating the step S201; at this time, although a new controllable fan is started, the wind farm active power target value and the actual active power are not represented and reach the active power set value of the power grid, and whether the new fan needs to be started or not needs to be continuously judged;
If equation (2) does not hold, then it means that a new fan does not need to be started, because: if the new wind power plant utilization ratio Pi is reduced to be smaller than the sum of the minimum wind power plant utilization ratio and the lag utilization ratio just because a new wind power plant is added, the wind power plant enters a stable state, the active power target value and the actual active power of the wind power plant reach the active power set value of the power grid, the power generation of each wind power plant is at the highest reasonable efficiency and slightly larger than the sum of the minimum wind power plant utilization ratio and the lag utilization ratio, and the new wind power plant does not need to be started continuously, so that the operation is not performed at the moment.
As shown in fig. 3, in step S201,
if judgment formula (1): if the real-time utilization rate of the wind farm is greater than the minimum utilization rate of the wind farm and the hysteresis utilization rate is not satisfied, executing step S203;
s203, judging whether the controllable fan in the shutdown process exists,
if there is a controllable fan in the process of stopping, repeating step S201 after waiting for the controllable fan in the process of stopping to finish,
if there is no controllable fan in the stopping process, executing step S204;
s204, judging whether the formula (3) is satisfied, wherein the real-time utilization rate of the wind power plant is less than the minimum utilization rate of the wind power plant,
If the formula (3) is established, executing step 220, and stopping a controllable fan in operation;
if the judgment formula (3) is not established, the wind power plant utilization rate is just the same, and no additional starting or stopping operation is needed.
After judging that the sum of the available powers of the started fans is not too low, further judging whether the sum of the available powers of the started fans is too high or not, wherein the sum of the available powers of the started fans is too high, so that one running fan has to be stopped.
Before stopping a wind turbine, it is first confirmed whether the real-time power of the wind power plant has reached a steady state or is fluctuating, so as to accurately judge the real-time utilization rate of the wind power plant.
In an embodiment of the present invention, as shown in fig. 5, step S220 includes the following steps:
s221: selecting a controllable fan to be stopped;
sequencing the controllable fans according to the grid connection time, sequencing the controllable fans with long grid connection time before the controllable fans with short grid connection time after the controllable fans with short grid connection time, and selecting the controllable fans which are sequenced at the forefront end as controllable fans to be stopped according to the sequenced sequences;
s222: judging whether or not the formula (4) is satisfied: the new utilization rate Ps of the wind power plant is less than 1,
if the formula (4) is satisfied, controlling the selected controllable fan to stop, and zeroing the grid-connected time of the selected controllable fan, and then repeating the step S201;
If equation (4) is not satisfied, it means that no shutdown operation is required.
Before stopping the selected controllable fan, judging whether stopping the controllable fan can cause the wind power plant new utilization rate Ps to be too large, and if the wind power plant new utilization rate Ps is still smaller than 1 after stopping the controllable fan, indicating that the controllable fan can be stopped.
If the new utilization rate Ps of the wind farm exceeds 1 simply because the available wind turbines are reduced, the wind farm is indicated to be in a stable state, the active power target value and the actual active power of the wind farm reach the active power set value of the power grid, and at the moment, the power generation of each wind turbine of the wind farm is in reasonable efficiency, and the wind turbines in operation do not need to be stopped, so that the operation is not performed at the moment.
The following is a specific example of the present embodiment:
and the wind power plant is connected to a grid-connected power generation instruction of the upper power grid, the sector management starts to judge whether each fan has a starting condition, and if the power generation time is not in the working time of the sector management, any fan is not limited by the environment. If power is generated during the daytime, the starting and ending angles of sector management and preset reduction parameters are combined to judge whether the power generation inhibition effect of the sector management on one fan is greatly reduced so that the fan has to be in a stop state. If one fan is not affected by sector management or is less affected, all fans of the wind power plant start to start one by one, when the sum of available active power of the started fans reaches a reference value set by a power grid, the control system still judges whether the preset ideal utilization rate of the wind power plant is reached, if the real-time utilization rate of the wind power plant is too high and the redundancy is too low, the new fans are continuously started to enable the actual active power of all fans to be reduced until the redundancy requirement is reached. For example, the power grid requires 40MW of power generation, the available power of fans in the wind power plant at the whole wind speed is 10MW, and if the preset real-time utilization rate of the wind power plant is 1 at the maximum value, only 4 fans are started enough. If the maximum real-time utilization rate of the wind farm is 0.6, which means that each fan sends 6MW at maximum on average, 7 fans need to be started, and each fan sends 5.7MW to meet the redundancy requirement. At the moment, the upper power grid reduces the active power reference value to a certain extent, the generated power of the wind power plant and the real-time utilization rate of the generated power are greatly reduced, the wind power plant starts to judge whether a shutdown condition is met, if so, a fan with long search grid-connected time performs condition judgment to shutdown until the real-time utilization rate of the wind power plant returns to a normal level. And then the upper power grid increases the active power reference value to a certain degree, the wind power plant starts to judge whether the starting condition is met, if so, the fans with longer off-grid time are searched to judge whether the power is started or not, and until the real-time utilization rate of the wind power plant returns to the normal level.
Example 2
The present embodiment provides a control system 100 for a wind farm.
As shown in fig. 6, the control system 100 includes:
the control module 160 is used for controlling the start and stop of fans in the wind power plant;
the screening module 110 is used for screening controllable fans which are not affected by sector management in the wind power plant; and
a first judging module 101, configured to judge whether the formula (1) is satisfied, if yes, call the control module 160 to start a new controllable fan (controllable fan in a shutdown state);
wherein, formula (1): the real-time utilization rate of the wind power plant is greater than the minimum utilization rate and the hysteresis utilization rate of the wind power plant;
wind farm real-time utilization = wind farm active power target value/sum of available power of started fans.
The screening module 110 includes: a first judgment unit 111, a second judgment unit 112, and a third judgment unit 113;
the first judging unit 111 is configured to judge whether the local time is at the time of the sector management operation, if not, the fan is a controllable fan,
if yes, call the second judging unit 112;
the second determining unit 112 is configured to determine whether the fan is at an applicable angle for sector management,
if the second judging unit 112 judges that the fan is not at the applicable angle for sector management, the fan is a controllable fan,
If the second judging unit 112 judges that the fan is at the applicable angle for sector management, the third judging unit 113 is called;
the third determining unit 113 is configured to determine whether a predicted value of a power reduction amount of the fan caused by sector management is greater than a preset value of a power reduction amount preset by the wind farm, if yes, the fan is not a controllable fan, and if not, the fan is a controllable fan.
If the third judging unit 113 judges that the predicted value of the power reduction amount of the fan caused by sector management is greater than the preset value of the power reduction amount of the wind farm, the control module 160 is invoked to control the fan to stop.
The control system 100 further includes: a boot process determination module 140;
the startup process judging module 140 is configured to determine whether there is a controllable fan in the startup process after the first judging module 101 determines that the formula (1) is satisfied,
if yes, after waiting for the start of the controllable fan in the starting process, the first judging module 101 is called again,
if not, the control module 160 is invoked to start a new controllable fan.
The control system 100 further includes:
a startup selection module 120, configured to select a controllable fan to be started; and
the second judging module 102 is configured to judge whether the formula (2) is satisfied, if yes, call the control module 160 to start the controllable fan selected by the startup selecting module 120, and then call the first judging module 101 again;
Wherein, formula (2): the new utilization rate Pi of the wind power plant is greater than the minimum utilization rate and the hysteresis utilization rate of the wind power plant;
wind farm new utilization pi=wind farm active power target/Pti, pti=sum of available active power of started fans+available active power of controllable fans to be turned on.
The power-on selection module 120 includes:
the startup sequencing unit 121 is configured to sequence the controllable fans, wherein the controllable fans with long offline time are arranged in front, and the controllable fans with short offline time are arranged behind; and
the startup selection unit 123 is configured to select, according to the sequence ordered by the ordering module, the controllable fans ordered at the forefront end as controllable fans to be started.
The power-on selection module 120 further includes: a failure judgment unit 122 and a rejection unit 124;
the failure determination unit 122 is configured to determine whether the controllable fans arranged at the forefront have no failure,
if so, the power-on selection unit 123 is invoked,
if not, the call rejection unit 124 rejects the controllable fans arranged at the forefront in the arranged sequence, and recalls the start-up sequencing unit 121.
The control system 100 further includes: a third judgment module 103;
the third judging module 103 is configured to judge whether the formula (3) is satisfied when the first judging module 101 judges that the formula (1) is not satisfied,
If yes, calling the control module 160 to stop a controllable fan in operation;
wherein, formula (3): the real-time utilization rate of the wind power plant is less than the minimum utilization rate of the wind power plant.
The control system 100 also includes a shutdown process determination module 150;
the shutdown process determining module 150 is configured to determine whether there is a controllable fan in the shutdown process after the first determining module 101 determines that the equation (1) is not satisfied,
if so, after waiting for the shutdown of the controllable fan in the shutdown process, the first judging module 101 is called again,
if not, a third determination module 103 is invoked.
The control system 100 further includes: the shutdown selection module 130 and the fourth determination module 104;
the shutdown selection module 130 is used for selecting a controllable fan to be shutdown;
the fourth determining module 104 is configured to determine whether the equation (4) is satisfied,
if yes, the control module 160 is called to stop the controllable fan selected by the shutdown selection module 130, and then the first judgment module 101 is called again;
wherein, formula (4): the new utilization rate Ps of the wind power plant is less than 1;
wind farm new utilization ps=wind farm active power target value/Pts, pts=sum of available active power of started fans-available active power of controllable fans to be shut down.
The shutdown selection module 130 further includes: a stop sorting unit 131 and a stop selecting unit 132;
the shutdown sequencing unit 131 is used for sequencing the controllable fans according to the grid connection time, wherein the controllable fans with long grid connection time are arranged in front, and the controllable fans with short grid connection time are arranged in back;
the shutdown selecting unit 132 is configured to select, as the controllable fans to be shutdown, the controllable fans arranged at the forefront in the sequence arranged by the shutdown ordering unit 131.
Example 3
The present embodiment provides an electronic device, as shown in fig. 7, where the electronic device may include a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the steps of the method for controlling a wind farm in the foregoing embodiment 1 are implemented.
It should be understood that the electronic device shown in fig. 7 is merely an example, and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.
As shown in fig. 7, electronic device 2 may be embodied in the form of a general purpose computing device, such as: which may be a server device. The components of the electronic device 2 may include, but are not limited to: the at least one processor 3, the at least one memory 4, a bus 5 connecting the different system components, including the memory 4 and the processor 3.
The bus 5 may include a data bus, an address bus, and a control bus.
The memory 4 may include volatile memory such as Random Access Memory (RAM) 41 and/or cache memory 42, and may further include Read Only Memory (ROM) 43.
The memory 4 may also include a program tool 45 (or utility) having a set (at least one) of program modules 44, such program modules 44 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.
The processor 3 executes various functional applications and data processing, such as the steps of the control method of the wind farm in the aforementioned embodiment 1 of the present invention, by running a computer program stored in the memory 4.
The electronic device 2 may also communicate with one or more external devices 6, such as a keyboard, pointing device, etc. Such communication may be through an input/output (I/O) interface 7. Also, the model-generated electronic device 2 may communicate with one or more networks (e.g., a local area network, LAN, wide area network, WAN, and/or public network) via the network adapter 8.
As shown in fig. 7, the network adapter 8 may communicate with other modules of the model-generated electronic device 2 via the bus 5. Those skilled in the art will appreciate that although not shown, other hardware and/or software modules may be used in connection with the model-generated electronic device 2, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, data backup storage systems, and the like.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of an electronic device are mentioned, such a division is only exemplary and not mandatory. Indeed, the features and functionality of two or more units/modules described above may be embodied in one unit/module in accordance with embodiments of the present invention. Conversely, the features and functions of one unit/module described above may be further divided into ones that are embodied by a plurality of units/modules.
Example 4
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the control method of a wind farm in the foregoing embodiment 1.
More specific ways in which the computer-readable storage medium may be employed include, but are not limited to: portable disk, hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible embodiment, the invention may also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the steps of implementing the control method of a wind farm as in the aforementioned embodiment 1, when the program product is run on the terminal device.
Wherein the program code for carrying out the invention may be written in any combination of one or more programming languages, the program code may execute entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device, partly on a remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (22)
1. The control method of the wind power plant is characterized by comprising the following steps of:
s100: screening controllable fans which are not affected by sector management;
s201: judging whether the real-time utilization rate of the wind farm is greater than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind farm, if so, executing step 210;
s210: judging whether to start the controllable fan in a stop state;
the real-time utilization rate of the wind power plant is the ratio of the sum of the active power target value of the wind power plant and the available power of the started fan;
the step S100 includes:
step S101: judging whether the local time is in the time of sector management work or not, if not, the fan is a controllable fan; if yes, executing step S102;
step S102: judging whether the fan is at an applicable angle of sector management or not; if yes, executing step S103; if not, judging that the fan is a controllable fan;
step S103: judging whether the power reduction predicted value of the fan caused by sector management is larger than a power reduction preset value preset by a wind power plant, if not, judging that the fan is a controllable fan; if yes, judging that the fan is not a controllable fan.
2. A method of controlling a wind farm according to claim 1, wherein,
In step S103, if it is determined that the predicted value of the power reduction amount of the fan caused by sector management is greater than the preset value of the power reduction amount of the wind farm, the following operations are performed: if the fan is in a stop state, stopping the fan continuously, and if the fan is in a power generation state, stopping the fan.
3. A method of controlling a wind farm according to claim 1, wherein,
in step S210, further includes:
judging whether a controllable fan in the starting process exists or not,
if yes, after the controllable fan in the starting process is started, repeating the step S201;
if not, step S210 is performed.
4. A method of controlling a wind farm according to claim 1, wherein,
step S210 includes the steps of:
s211: selecting a controllable fan which is to be started and is in a shutdown state;
s215: judging whether the new utilization rate Pi of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
if yes, starting the selected controllable fan, and repeating the step S201;
the new utilization rate Pi of the wind power plant is the ratio of the active power target value of the wind power plant to Pti, wherein Pti is the sum of the available active power of the started fans and the sum of the available active power of the controllable fans to be started and in a shutdown state.
5. A method of controlling a wind farm according to claim 4, wherein,
step S211 includes the steps of:
s212: sequencing the controllable fans according to the off-grid time, wherein the controllable fans with long off-grid time are arranged in front, and the controllable fans with short off-grid time are arranged behind;
s214: and selecting the controllable fans arranged at the forefront end as the controllable fans to be started and in a shutdown state according to the arranged sequence.
6. A method of controlling a wind farm according to claim 5,
step S211 further includes the steps of:
s213: judging whether the controllable fans arranged at the forefront end have no faults,
if yes, go to step S214,
if not, the controllable fan is removed from the arranged sequence, and step S212 is repeated.
7. A method of controlling a wind farm according to claim 1, wherein,
in the step S201 of the process of the present invention,
if it is determined that the real-time utilization rate of the wind farm is not greater than the sum of the minimum utilization rate and the lag utilization rate of the wind farm, step S204 is executed: judging whether the real-time utilization rate of the wind power plant is smaller than the minimum utilization rate of the wind power plant,
if yes, go to step 220: and stopping a controllable fan in operation.
8. A method of controlling a wind farm according to claim 7,
In the step S201 of the process of the present invention,
if it is determined that the real-time utilization rate of the wind farm is not greater than the sum of the minimum utilization rate and the lag utilization rate of the wind farm, step S203 is executed: judging whether a controllable fan in the shutdown process exists or not,
if so, after waiting for the shutdown of the controllable fan in the shutdown process, repeating the step S201,
if not, step S204 is performed: and judging whether the real-time utilization rate of the wind power plant is smaller than the minimum utilization rate of the wind power plant.
9. A method of controlling a wind farm according to claim 7,
step S220 includes the steps of:
s221: selecting a controllable fan to be stopped;
s222: judging whether the new utilization rate Ps of the wind power plant is less than 1,
if yes, controlling the selected controllable fan to stop, and repeating the step S201;
wherein the wind farm new utilization Ps is the ratio of the wind farm active power target value to Pts, which is the difference between the sum of the available active power of the started fans and the available active power of the controllable fans to be shut down.
10. A method of controlling a wind farm according to claim 9,
in the step S221 of the process of the present invention,
sequencing the controllable fans according to the grid connection time, sequencing the controllable fans with long grid connection time before the controllable fans with short grid connection time after the controllable fans with short grid connection time, and selecting the controllable fans which are sequenced at the forefront end as the controllable fans to be stopped according to the sequenced sequences.
11. A control system for a wind farm, comprising:
the control module is used for controlling the start and stop of a fan in the wind power plant;
the screening module is used for screening controllable fans which are not affected by sector management in the wind power plant; and
a first judging module for judging whether the real-time utilization rate of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
if yes, a control module is called to start the controllable fan in a stop state;
the real-time utilization rate of the wind power plant is the ratio of the sum of the active power target value of the wind power plant and the available power of the started fan;
the screening module comprises: the device comprises a first judging unit, a second judging unit and a third judging unit;
the first judging unit is used for judging whether the local time is in the time of sector management work,
if not, the fan is a controllable fan,
if yes, calling the second judging unit;
the second judging unit is used for judging whether the fan is at an applicable angle for sector management,
if the second judging unit judges that the fan is not at the applicable angle of sector management, the fan is a controllable fan,
if the second judging unit judges that the fan is at the applicable angle of sector management, the third judging unit is called;
The third judging unit is used for judging whether the predicted value of the power reduction amount of the fan caused by sector management is larger than the preset value of the power reduction amount of the wind farm,
if so, the fan is not a controllable fan,
if not, the fan is a controllable fan.
12. The control system of a wind farm according to claim 11, wherein if the third determining unit determines that the predicted value of the power reduction amount of the fan caused by the sector management is greater than the preset value of the power reduction amount of the wind farm, the control module is invoked to control the fan to stop.
13. A control system for a wind farm according to claim 11, wherein the control system further comprises: a starting-up process judging module;
the starting-up process judging module is used for judging whether a controllable fan in the starting process exists or not after the first judging module judges that the real-time utilization rate of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
if yes, after the controllable fan in the starting process is started, the first judging module is called again,
if not, the control module is called to start the controllable fan in the stop state.
14. A control system for a wind farm according to claim 11, wherein the control system further comprises:
the starting-up selection module is used for selecting a controllable fan to be started; and
the second judging module is used for judging whether the new utilization rate Pi of the wind power plant is larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant, if yes, the control module is called to start the controllable fan selected by the starting selection module, and then the first judging module is called again;
wherein the new utilization rate Pi of the wind power plant is the ratio of the active power target value of the wind power plant to Pti, and Pti is the sum of the available active power of the started fans and the sum of the available active power of the controllable fans to be started.
15. The control system of a wind farm of claim 14, wherein the power-on selection module comprises:
the startup sequencing unit is used for sequencing the controllable fans, the controllable fans with long off-grid time are arranged in front, and the controllable fans with short off-grid time are arranged behind; and
the starting-up selecting unit is used for selecting the controllable fans arranged at the forefront end as the controllable fans to be started according to the sequence of the starting-up sequencing unit.
16. The control system of a wind farm of claim 15, wherein the power-on selection module further comprises: a fault judging unit and a rejecting unit;
The fault judging unit is used for judging whether the controllable fans arranged at the forefront end have no faults,
if yes, the starting-up selection unit is called,
if not, the rejecting unit is called to reject the controllable fans arranged at the forefront end in the arranged sequence, and the starting sequencing unit is called again.
17. A control system for a wind farm according to claim 11, wherein the control system further comprises: a third judging module;
the third judging module is used for judging whether the real-time utilization rate of the wind power plant is smaller than the minimum utilization rate of the wind power plant when the first judging module judges that the real-time utilization rate of the wind power plant is not larger than the sum of the minimum utilization rate and the hysteresis utilization rate of the wind power plant,
if yes, the control module is called to stop a controllable fan in operation.
18. The control system of a wind farm according to claim 17, wherein the control system further comprises a shutdown process determination module;
the shutdown process judging module is used for judging whether a controllable fan in the shutdown process exists or not after the first judging module judges that the real-time utilization rate of the wind power plant is not more than the sum of the minimum utilization rate and the lag utilization rate of the wind power plant,
If so, after the controllable fan in the stopping process is stopped, the first judging module is called again,
and if not, calling the third judging module.
19. The control system of a wind farm of claim 17, wherein the control system further comprises: a shutdown selection module and a fourth judgment module;
the shutdown selection module is used for selecting a controllable fan to be shutdown;
the fourth judging module is used for judging whether the new utilization rate Ps of the wind power plant is smaller than 1,
if yes, the control module is called to stop the controllable fan selected by the shutdown selection module, and then the first judgment module is called again;
wherein the new utilization rate Ps of the wind farm is the sum of the active power target value of the wind farm and Pts, and Pts is the difference between the sum of the available active power of the started fans and the available active power of the controllable fans to be stopped.
20. A control system for a wind farm according to claim 19, wherein the shutdown selection module further comprises: the machine comprises a machine stop sequencing unit and a machine stop selecting unit;
the shutdown sequencing unit is used for sequencing the controllable fans according to the grid connection time, wherein the controllable fans with long grid connection time are arranged in front, and the controllable fans with short grid connection time are arranged in back;
The shutdown selecting unit is used for selecting the controllable fans which are arranged at the forefront end in the sequence arranged by the shutdown sequencing unit as controllable fans to be shutdown.
21. An electronic device, comprising a memory: a processor and a computer program stored on a memory and executable on the processor, characterized in that the processor implements the steps of the method of controlling a wind farm according to any of the claims 1-10 when the computer program is executed.
22. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the method of controlling a wind farm according to any of claims 1-10.
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