CN112671003B - Multi-machine collaborative frequency modulation control method and device based on wind turbine generator - Google Patents
Multi-machine collaborative frequency modulation control method and device based on wind turbine generator Download PDFInfo
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Abstract
The application provides a multi-machine collaborative frequency modulation control method and device based on a wind turbine, wherein the method comprises the following steps: dividing M wind turbines of a target wind power plant to obtain N groups; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; and controlling the N groups to exit the frequency modulation according to the supporting time corresponding to each of the N groups. According to the application, on the premise of fully playing the frequency modulation capability of the wind power plant, the wind power generation set is scattered and orderly withdrawn from frequency modulation, so that the secondary drop of the system frequency is greatly improved, and the stability of the power system is further improved.
Description
Technical Field
The application relates to the technical field of power grid frequency modulation, in particular to a multi-machine collaborative frequency modulation control method and device based on a wind turbine generator.
Background
With the increasing exhaustion of traditional energy and the increasing aggravation of environmental problems, new energy power generation technologies represented by photovoltaic and wind power are rapidly developed. The variable-speed constant-frequency wind turbine generator system (mainly comprising a double-fed unit and a direct-drive unit) occupies a large proportion in new energy power generation, the output power of the wind turbine generator system is basically decoupled from the frequency of a power grid, and necessary frequency support is difficult to provide for the power grid. With the continuous improvement of the permeability of the variable-speed constant-frequency wind turbine in a power grid, the frequency adjustment capability of a power system is gradually weakened, and the wind turbine is urgently required to have the frequency adjustment capability similar to that of a conventional synchronous generator.
At present, an additional module with inertia and primary frequency modulation functions is added in a control strategy of the wind turbine generator to actively support the frequency of the power system, but when the wind turbine generator exits from frequency modulation, active power can drop greatly, secondary drop of the frequency of the power system is caused, and stability of the power system is not facilitated. When the active frequency modulation strategy of the wind turbine is applied to a wind power plant, the problem of secondary drop becomes more serious and complex due to the difference of operation conditions among the wind turbines.
The existing method can relieve or eliminate the secondary frequency drop to a certain extent on the premise of fully playing the frequency modulation capability of the wind turbine generator, and improves the problem of the secondary frequency drop. However, the existing methods are too complex, and often need to provide detailed power system parameters, so that engineering implementation difficulty is high.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a multi-machine collaborative frequency modulation control method and device based on a wind turbine, which can greatly improve the frequency secondary drop of a power system by enabling the wind turbine to exit frequency modulation in order on the premise of fully exerting frequency modulation of a wind farm, thereby improving the stability of the power system.
In order to solve the technical problems, the application provides the following technical scheme:
in a first aspect, the application provides a multi-machine collaborative frequency modulation control method based on a wind turbine, which comprises the following steps:
dividing M wind turbines of a target wind power plant to obtain N groups;
determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation;
and controlling the N groups to exit the frequency modulation according to the supporting time corresponding to each of the N groups.
Further, before the controlling the N packets to exit from frequency modulation according to the support time corresponding to each of the N packets, the method further includes:
optimizing the supporting time corresponding to each of the N groups to obtain target supporting time corresponding to each of the N groups;
correspondingly, controlling the N groups to exit from frequency modulation according to the supporting time corresponding to each of the N groups, including:
and controlling the N groups to exit the frequency modulation according to the target supporting time corresponding to each of the N groups.
The optimizing the supporting time corresponding to each of the N groups includes:
determining a limitation condition of the supporting time;
and reducing the supporting time corresponding to each of the N groups based on the limiting condition.
Wherein the constraint condition includes:
the absolute value of the difference value of the supporting time of any two groups is not less than the recovery time of the rotating speed of the first-withdrawn frequency-modulated group in the two groups;
the support time of any group is not more than the limit support time of the group; the limit support time is the support time when the rotation speed is reduced to a set protection threshold value.
The method for dividing M wind turbines of a target wind power plant into N groups comprises the following steps:
determining wind speeds of M wind turbines;
and aggregating the wind turbine generators with the wind speed difference value within a preset range into a group.
Wherein, the controlling the N groups to exit from frequency modulation according to the support time corresponding to each of the N groups includes:
and sequencing the N support times, and sequentially controlling the N groups to exit the frequency modulation according to the sequence after sequencing.
The recovery mode of the rotating speed of the wind turbine generator comprises the following steps: a mode of tracking a curve along a maximum power point and a mode of comprehensively recovering the rotating speed.
In a second aspect, the application provides a multi-machine collaborative frequency modulation control device based on a wind turbine, which comprises:
the grouping unit is used for dividing M wind turbines of the target wind power plant to obtain N groups;
the processing unit is used for determining the recovery mode of the rotating speeds of the M wind turbines and calculating the supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation;
and the control unit is used for controlling the N groups to exit the frequency modulation according to the supporting time corresponding to each of the N groups.
Further, the method further comprises the following steps:
the optimizing unit is used for optimizing the supporting time corresponding to each of the N groups to obtain target supporting time corresponding to each of the N groups;
correspondingly, the control unit comprises:
and the control subunit is used for controlling the N groups to exit the frequency modulation according to the target supporting time corresponding to each of the N groups.
Wherein the optimizing unit includes:
the inquiry module is used for determining the limiting condition of the supporting time;
and the calculation module is used for reducing the supporting time corresponding to each of the N groups based on the limiting condition.
Wherein the grouping unit includes:
the wind speed subunit is used for determining wind speeds of M wind turbines;
and the aggregation subunit is used for aggregating the wind turbine generators with the wind speed difference value within a preset range into one group.
Wherein the control unit includes:
and the control subunit is used for sequencing the N supporting times and sequentially controlling the N groups to exit the frequency modulation according to the sequence after sequencing.
In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the steps of the multi-machine collaborative frequency modulation control method based on wind turbine generator are implemented when the processor executes the program.
In a fourth aspect, the present application provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the steps of the multi-machine collaborative frequency modulation control method based on wind turbines.
According to the technical scheme, the application provides a multi-machine collaborative frequency modulation control method and device based on wind turbine generators, and N groups are obtained by dividing M wind turbine generators of a target wind power plant; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation; according to the supporting time corresponding to each of the N groups, the N groups are controlled to exit frequency modulation, and on the premise of fully playing the frequency modulation capacity of the wind power plant, the wind power units are enabled to exit frequency modulation in a dispersed and orderly mode, so that the secondary drop of the system frequency is greatly improved, and the stability of the power system is further improved. And the realization method is simple and convenient, the cost is low, and the engineering large-scale popularization is easy.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a multi-machine collaborative frequency modulation control method based on a wind turbine according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a principle of the comprehensive recovery of the rotational speed in the embodiment of the application.
Fig. 3 is a schematic diagram of the relationship between the point F and the recovery time in the embodiment of the application.
FIG. 4 is a graph showing the relationship between the recovery time and the support time at different wind speeds according to an embodiment of the present application.
Fig. 5 is a second flow chart of a multi-machine collaborative frequency modulation control method based on a wind turbine according to an embodiment of the present application.
FIG. 6 is a graph illustrating a relationship between a limit support time and a wind speed of a typical wind turbine according to an embodiment of the application.
FIG. 7 is a schematic diagram of a topology of a simulation system according to an embodiment of the present application.
Fig. 8 is a system frequency waveform of the embodiment of the present application in which the load disturbance accounts for 2%, 3% and 4% of the installed capacity of the system.
Fig. 9 is a first structural schematic diagram of a multi-machine collaborative frequency modulation control device based on a wind turbine in an embodiment of the application.
Fig. 10 is a second structural schematic diagram of a multi-machine collaborative frequency modulation control device based on a wind turbine in an embodiment of the application.
Fig. 11 is a schematic structural diagram of an electronic device in an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides an embodiment of a multi-machine cooperative frequency modulation control method based on a wind turbine, and referring to fig. 1, the multi-machine cooperative frequency modulation control method based on the wind turbine specifically comprises the following contents:
s101: dividing M wind turbines of a target wind power plant to obtain N groups;
it can be appreciated that a large wind farm generally has tens to hundreds of wind turbines, and the control method accurate to a single wind turbine is excessively calculated, and based on the calculated calculation, M wind turbines of a target wind farm to be controlled are grouped.
It should be noted that M is the number of wind turbines in the wind farm, and M is greater than 1.N is the grouping number of M wind turbines. N is less than M and greater than 1.
And during specific grouping, the wind turbine generators with the wind speed difference value within a preset range are grouped into one group according to the wind speed of the position of each wind turbine generator. For example: in the embodiment, the wind turbine generators with the wind speed difference within the range of +/-0.25 m/s are aggregated into one group, and the supporting time, the recovery time and the power fixed value of the wind turbine generators in each group are considered to be consistent.
S102: determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation;
the method is characterized in that different supporting time is provided according to the operation conditions of the wind turbines, each group is dispersed to recover the rotating speed, and the secondary influence on the frequency caused by the simultaneous withdrawal of a large number of wind turbines is reduced as much as possible. Based on the above, a functional relation between the recovery time and the support time of the wind turbine is established, and the functional relation is simplified into a form which is only related to the support time. Therefore, a recovery mode of the rotating speed of the wind turbine generator is required to be determined first, and recovery time is determined according to the recovery mode.
In this step, the recovery method of the rotational speed of the wind turbine includes: a mode of tracking a curve along a maximum power point and a mode of comprehensively recovering the rotating speed.
Ext> inext> theext> implementationext>,ext> aext> modeext> ofext> comprehensiveext> recoveryext> ofext> theext> rotatingext> speedext> isext> adoptedext>,ext> referringext> toext> aext> schematicext> diagramext> ofext> theext> comprehensiveext> recoveryext> ofext> theext> rotatingext> speedext> shownext> inext> fig.ext> 2ext>,ext> aext> typicalext> pathext> ofext> outputext> powerext> whenext> theext> windext> turbineext> isext> frequencyext> modulatedext> isext> Aext> -ext> Bext> -ext> Cext>,ext> andext> aext> typicalext> pathext> ofext> outputext> powerext> whenext> theext> windext> turbineext> isext> frequencyext> modulatedext> isext> Cext> -ext> Fext> -ext> Gext> -ext> Aext>.ext> The method of rotational speed integrated recovery can improve frequency secondary drop compared with the method of tracking (MPPT) curve along the maximum power point.
It should be noted that the value of the point F may be any value between D and E, and referring to fig. 3, the values of different fixed values of the point F have a significant effect on the recovery time of the rotational speed of the wind turbine. In this embodiment F takes the midpoint between D-E.
And determining the relation between the recovery time and the support time under different wind speeds, and calculating the support time corresponding to each of the N groups according to the determined relation.
Referring to the relationship curve of the support time and the recovery time of the wind turbine generator set at different wind speeds shown in fig. 4, wherein (a) corresponds to a wind speed of 8m/s, (b) corresponds to a wind speed of 8.5m/s, (c) corresponds to a wind speed of 9m/s, and (d) corresponds to a wind speed of 9.5m/s. The thin curve is the relation between the recovery time of the rotating speed and the supporting time, and the thick curve is the relation between the recovery time of the rotating speed and the supporting time, which is obtained by adopting linear relation fitting. It can be seen that the relationship between recovery time and support time can be basically represented by linear fitting, and the model can be greatly simplified, so that the method is suitable for engineering application.
S103: and controlling the N groups to exit the frequency modulation according to the supporting time corresponding to each of the N groups.
In this step, when the frequency fluctuation occurs in the power system, active power support is provided according to the support time corresponding to each of the N groups. The wind turbine generator system orderly exits frequency modulation, so that the instantaneous large-amplitude drop of the output of the wind power plant is prevented, and the problem of secondary drop of the frequency of the power system is effectively solved.
In the specific implementation, the support time can be ordered according to the order from small to large, the support time can be ordered according to the order from large to small, or the support time can be ordered according to the use requirement. And sequentially controlling the N groups to exit the frequency modulation according to the ordered sequence.
The frequency modulation supporting time of the wind turbine at different wind speeds is determined, so that the wind turbine can exit frequency modulation orderly, instantaneous large-scale drop of the wind power plant output is prevented, and the problem of frequency secondary drop is effectively solved.
As can be seen from the above description, according to the multi-machine collaborative frequency modulation control method based on the wind turbine provided by the embodiment of the application, N groups are obtained by dividing M wind turbines of a target wind farm; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation; according to the supporting time corresponding to each of the N groups, the N groups are controlled to exit frequency modulation, and on the premise of fully playing the frequency modulation capacity of the wind power plant, the wind power units are enabled to exit frequency modulation in a dispersed and orderly mode, so that the secondary drop of the system frequency is greatly improved, and the stability of the power system is further improved. And the realization method is simple and convenient, the cost is low, and the engineering large-scale popularization is easy.
In an embodiment of the present application, referring to fig. 5, step S104 is further included before step S103 of the multi-machine collaborative fm control method based on wind turbine, and specifically includes the following steps:
s104: optimizing the supporting time corresponding to each of the N groups to obtain target supporting time corresponding to each of the N groups;
correspondingly, step S103 controls the N packets to exit from frequency modulation according to the support time corresponding to each of the N packets, including:
s1031: and controlling the N groups to exit the frequency modulation according to the target supporting time corresponding to each of the N groups.
The method is characterized in that different supporting time is provided according to the operation conditions of the wind turbines, each group is dispersed to recover the rotating speed, and the secondary influence on the frequency caused by the simultaneous withdrawal of a large number of wind turbines is reduced as much as possible. Based on the relation between the recovery time and the support time under different wind speeds is determined, and the support time corresponding to each of the N groups is calculated according to the determined relation.
When the support time is optimized, the limitation condition of the support time needs to be determined first, and the support time corresponding to each of the N groups is reduced based on the limitation condition.
Wherein the limiting conditions include: the absolute value of the difference value of any two grouping support time is not smaller than the recovery time of the rotating speed of the grouping which exits the frequency modulation in the two groupings, so that the ordered exiting of the frequency modulation of the grouping of the wind turbine can be ensured;
the supporting time of any grouping is not longer than the limiting supporting time of the grouping, and the safety of the wind turbine generator system body can be ensured. The limit support time is the support time when the rotation speed is reduced to a set protection threshold value.
Establishing a wind farm frequency modulation optimization model with the longest group support time as a target, wherein the model is as follows:
the constraint conditions are as follows:
ΔT i ≤ΔT max ；
wherein DeltaT i Support time defined as frequency modulation of the ith packetThe time from the beginning of frequency modulation of the wind turbine to the exiting of the frequency modulation; delta T max The method comprises the steps of defining limit supporting time, namely frequency modulation supporting time when the rotating speed of the wind turbine generator is reduced to a set protection threshold value; delta T rec The recovery time is defined as the time required for the wind turbine to recover to 95% of the rotation speed before the wind turbine is subjected to frequency modulation from the moment of exiting the frequency modulation; delta T rec,k Is the recovery time of the rotational speed of the first retired modulated packet (kth packet), N i And defining the total number of the ith grouping wind turbine generator.
For each group of wind turbines, the limiting support time Δt of the group is determined max . The limit support time is influenced by unit parameters, frequency modulation and power amplification amplitude, wind speed and rotation speed lower limit threshold, and can be obtained through simulation or calculation in practical application. For example: referring to a relation curve of the limit support time and the wind speed of a typical wind turbine shown in fig. 6, a lower rotation speed limit is set to be 0.8pu, and the increasing power amplitude is set to be 0.1pu.
In order to further explain the scheme, the application provides a specific implementation case of a multi-machine collaborative frequency modulation control method based on a wind turbine, which specifically comprises the following contents:
a simulation system as shown in fig. 7 was constructed in which the installed capacity of the wind farm was 40MW (2 mw×20), and the installed capacity of the synchronous machine was 250mva, and the load disturbance was input at 120 seconds. Three frequency modulation methods were simulated as follows
The method comprises the following steps: the application provides a multi-machine cooperative frequency modulation method;
the second method is as follows: the cooperative multi-machine frequency modulation is not considered;
and a third method: the wind farm does not participate in the system frequency modulation.
Referring to fig. 8, the system frequency waveforms for the case where the load disturbance is 2%, 3% and 4% of the installed capacity of the system are shown, respectively, where (a) corresponds to 2% of the load disturbance, (b) corresponds to 3% of the load disturbance, and (c) corresponds to 4% of the load disturbance.
Therefore, when the second method is adopted, the frequency of the power system is severely dropped secondarily, and the lowest frequency value is far lower than the value when the wind farm does not participate in frequency modulation. After the first method is adopted, the lowest point of the system frequency is greatly improved, and meanwhile, the once-falling depth of the frequency is also greatly improved.
The embodiment of the application provides a concrete implementation mode of a multi-machine collaborative frequency modulation control device based on a wind turbine, which can realize the whole content in the multi-machine collaborative frequency modulation control method based on the wind turbine, and referring to fig. 9, the multi-machine collaborative frequency modulation control device based on the wind turbine specifically comprises the following contents:
the grouping unit 10 is used for dividing M wind turbines of the target wind power plant to obtain N groups;
the processing unit 20 is used for determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation;
and the control unit 30 is used for controlling the N groups to exit the frequency modulation according to the supporting time corresponding to each of the N groups.
Wherein the grouping unit 10 comprises:
the wind speed subunit is used for determining wind speeds of M wind turbines;
and the aggregation subunit is used for aggregating the wind turbine generators with the wind speed difference value within a preset range into one group.
Wherein the control unit 20 includes:
and the control subunit is used for sequencing the N supporting times and sequentially controlling the N groups to exit the frequency modulation according to the sequence after sequencing.
In an embodiment of the present application, referring to fig. 10, the multi-machine collaborative fm control device based on a wind turbine unit specifically includes the following contents:
an optimizing unit 40, configured to perform optimization processing on the support times corresponding to the N groups, to obtain target support times corresponding to the N groups;
correspondingly, the control unit comprises:
and the control subunit is used for controlling the N groups to exit the frequency modulation according to the target supporting time corresponding to each of the N groups.
Wherein the optimizing unit includes:
the inquiry module is used for determining the limiting condition of the supporting time;
and the calculation module is used for reducing the supporting time corresponding to each of the N groups based on the limiting condition.
The embodiment of the multi-machine cooperative frequency modulation control device based on the wind turbine can be particularly used for executing the processing flow of the embodiment of the multi-machine cooperative frequency modulation control method based on the wind turbine in the embodiment, and the functions of the embodiment are not repeated herein, and can be referred to in the detailed description of the embodiment of the method.
As can be seen from the above description, the multi-machine collaborative frequency modulation control device based on the wind turbine provided by the embodiment of the application obtains N groups by dividing M wind turbines of a target wind farm; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation; according to the supporting time corresponding to each of the N groups, the N groups are controlled to exit frequency modulation, and on the premise of fully playing the frequency modulation capacity of the wind power plant, the wind power units are enabled to exit frequency modulation in a dispersed and orderly mode, so that the secondary drop of the system frequency is greatly improved, and the stability of the power system is further improved. And the realization method is simple and convenient, the cost is low, and the engineering large-scale popularization is easy.
The application provides an embodiment of electronic equipment for realizing all or part of contents in a multi-machine collaborative frequency modulation control method based on a wind turbine, which comprises the following contents:
a processor (processor), a memory (memory), a communication interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete communication with each other through the bus; the communication interface is used for realizing information transmission between related devices; the electronic device may be a desktop computer, a tablet computer, a mobile terminal, etc., and the embodiment is not limited thereto. In this embodiment, the electronic device may be implemented by referring to an embodiment for implementing the method for implementing the multi-machine collaborative fm control based on wind turbine and an embodiment for implementing the device for implementing the multi-machine collaborative fm control based on wind turbine, and the contents thereof are incorporated herein, and the repetition is omitted.
Fig. 11 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 11, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this fig. 11 is exemplary; other types of structures may also be used in addition to or in place of the structures to implement telecommunications functions or other functions.
In an embodiment, the multi-machine collaborative frequency modulation control function based on wind turbine may be integrated into the central processor 9100. The central processor 9100 may be configured to perform the following control:
dividing M wind turbines of a target wind power plant to obtain N groups; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation; and controlling the N groups to exit the frequency modulation according to the supporting time corresponding to each of the N groups.
As can be seen from the above description, the electronic device provided by the embodiment of the present application obtains N groups by dividing M wind turbines of a target wind farm; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation; according to the supporting time corresponding to each of the N groups, the N groups are controlled to exit frequency modulation, and on the premise of fully playing the frequency modulation capacity of the wind power plant, the wind power units are enabled to exit frequency modulation in a dispersed and orderly mode, so that the secondary drop of the system frequency is greatly improved, and the stability of the power system is further improved. And the realization method is simple and convenient, the cost is low, and the engineering large-scale popularization is easy.
In another embodiment, the wind turbine generator based multi-machine cooperative frequency modulation control device may be configured separately from the central processor 9100, for example, the wind turbine generator based multi-machine cooperative frequency modulation control device may be configured as a chip connected to the central processor 9100, and the control of the central processor is used to implement the wind turbine generator based multi-machine cooperative frequency modulation control function.
As shown in fig. 11, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 need not include all of the components shown in fig. 11; in addition, the electronic device 9600 may further include components not shown in fig. 11, and reference may be made to the related art.
As shown in fig. 11, the central processor 9100, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, which central processor 9100 receives inputs and controls the operation of the various components of the electronic device 9600.
The memory 9140 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information about failure may be stored, and a program for executing the information may be stored. And the central processor 9100 can execute the program stored in the memory 9140 to realize information storage or processing, and the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, but not limited to, an LCD display.
The memory 9140 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), SIM card, etc. But also a memory which holds information even when powered down, can be selectively erased and provided with further data, an example of which is sometimes referred to as EPROM or the like. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 storing application programs and function programs or a flow for executing operations of the electronic device 9600 by the central processor 9100.
The memory 9140 may also include a data store 9143, the data store 9143 for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers of the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, address book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. A communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, as in the case of conventional mobile communication terminals.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, etc., may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and to receive audio input from the microphone 9132 to implement usual telecommunications functions. The audio processor 9130 can include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100 so that sound can be recorded locally through the microphone 9132 and sound stored locally can be played through the speaker 9131.
The embodiment of the present application further provides a computer readable storage medium capable of implementing all the steps in the multi-machine cooperative frequency modulation control method based on wind turbine in the above embodiment, where the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements all the steps in the multi-machine cooperative frequency modulation control method based on wind turbine in the above embodiment, for example, the processor implements the following steps when executing the computer program:
dividing M wind turbines of a target wind power plant to obtain N groups; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation; and controlling the N groups to exit the frequency modulation according to the supporting time corresponding to each of the N groups.
As can be seen from the above description, the computer readable storage medium provided by the embodiment of the present application obtains N groups by dividing M wind turbines of a target wind farm; determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation; according to the supporting time corresponding to each of the N groups, the N groups are controlled to exit frequency modulation, and on the premise of fully playing the frequency modulation capacity of the wind power plant, the wind power units are enabled to exit frequency modulation in a dispersed and orderly mode, so that the secondary drop of the system frequency is greatly improved, and the stability of the power system is further improved. And the realization method is simple and convenient, the cost is low, and the engineering large-scale popularization is easy.
Although the application provides method operational steps as described in the examples or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented by an actual device or client product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment) as shown in the embodiments or figures.
It will be appreciated by those skilled in the art that embodiments of the present description may be provided as a method, apparatus (system) or computer program product. Accordingly, the present specification embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the one or more processes in the flowchart and/or block diagram
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments. In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The present application is not limited to any single aspect, nor to any single embodiment, nor to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the application may be used alone or in combination with one or more other aspects and/or embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.
Claims (12)
1. A multi-machine collaborative frequency modulation control method based on a wind turbine generator is characterized by comprising the following steps:
dividing M wind turbines of a target wind power plant to obtain N groups, wherein N is greater than 1;
determining a recovery mode of the rotating speeds of the M wind turbines and calculating supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation;
controlling N groups to exit frequency modulation according to the supporting time corresponding to each of the N groups;
dividing M wind turbines of a target wind power plant into N groups comprises:
determining wind speeds of M wind turbines;
the wind turbine generators with the wind speed difference value within a preset range are aggregated into a group;
the calculating the supporting time corresponding to each of the N groups according to the recovery time includes:
and determining the relation between the recovery time and the support time under different wind speeds, and calculating the support time corresponding to each of the N groups according to the determined relation.
2. The method for controlling multi-machine cooperation frequency modulation based on wind turbine generators according to claim 1, further comprising, before controlling the N groups to exit frequency modulation according to the support time corresponding to each of the N groups:
optimizing the supporting time corresponding to each of the N groups to obtain target supporting time corresponding to each of the N groups;
correspondingly, controlling the N groups to exit from frequency modulation according to the supporting time corresponding to each of the N groups, including:
and controlling the N groups to exit the frequency modulation according to the target supporting time corresponding to each of the N groups.
3. The method for controlling the multi-machine collaborative frequency modulation based on the wind turbine generator according to claim 2, wherein the optimizing the support time corresponding to each of the N groups comprises:
determining a limitation condition of the supporting time;
and reducing the supporting time corresponding to each of the N groups based on the limiting condition.
4. The multi-machine collaborative frequency modulation control method based on the wind turbine generator set according to claim 3, wherein the limiting conditions comprise:
the absolute value of the difference value of the supporting time of any two groups is not less than the recovery time of the rotating speed of the first-withdrawn frequency-modulated group in the two groups;
the support time of any group is not more than the limit support time of the group; the limit support time is the support time when the rotation speed is reduced to a set protection threshold value.
5. The method for controlling the multi-machine cooperation frequency modulation based on the wind turbine according to claim 1, wherein the controlling the N groups to exit from frequency modulation according to the support time corresponding to each of the N groups comprises:
and sequencing the N support times, and sequentially controlling the N groups to exit the frequency modulation according to the sequence after sequencing.
6. The method for controlling the multi-machine cooperation frequency modulation based on the wind turbine according to claim 1, wherein the recovering mode of the rotating speed of the wind turbine comprises the following steps: a mode of tracking a curve along a maximum power point and a mode of comprehensively recovering the rotating speed.
7. Multi-machine cooperation frequency modulation control device based on wind turbine generator system, characterized by comprising:
the grouping unit is used for dividing M wind turbines of the target wind power plant to obtain N groups, wherein N is greater than 1;
the processing unit is used for determining the recovery mode of the rotating speeds of the M wind turbines and calculating the supporting time corresponding to each of the N groups according to the recovery time; the recovery time is the time for recovering the rotating speed corresponding to the recovery mode; the support time is from the beginning of frequency modulation to the exiting of frequency modulation;
the control unit is used for controlling the N groups to exit frequency modulation according to the supporting time corresponding to each of the N groups;
the grouping unit includes:
the wind speed subunit is used for determining wind speeds of M wind turbines;
the aggregation subunit is used for aggregating the wind turbine generators with the wind speed difference value within a preset range into a group;
the calculating the supporting time corresponding to each of the N groups according to the recovery time includes:
and determining the relation between the recovery time and the support time under different wind speeds, and calculating the support time corresponding to each of the N groups according to the determined relation.
8. The wind turbine generator set-based multi-machine collaborative frequency modulation control apparatus according to claim 7, further comprising:
the optimizing unit is used for optimizing the supporting time corresponding to each of the N groups to obtain target supporting time corresponding to each of the N groups;
correspondingly, the control unit comprises:
and the control subunit is used for controlling the N groups to exit the frequency modulation according to the target supporting time corresponding to each of the N groups.
9. The multi-machine collaborative frequency modulation control apparatus according to claim 8, wherein the optimization unit comprises:
the inquiry module is used for determining the limiting condition of the supporting time;
and the calculation module is used for reducing the supporting time corresponding to each of the N groups based on the limiting condition.
10. The wind turbine generator set-based multi-machine collaborative frequency modulation control apparatus according to claim 7, wherein the control unit comprises:
and the control subunit is used for sequencing the N supporting times and sequentially controlling the N groups to exit the frequency modulation according to the sequence after sequencing.
11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the wind turbine multi-machine collaborative frequency modulation control method according to any of claims 1 to 6 when executing the program.
12. A computer readable storage medium having stored thereon a computer program, which when executed by a processor realizes the steps of the wind turbine generator based multi-machine collaborative frequency modulation control method according to any of claims 1 to 6.
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