CN110943480B - Power system frequency modulation method and device, computer equipment and storage medium - Google Patents
Power system frequency modulation method and device, computer equipment and storage medium Download PDFInfo
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- CN110943480B CN110943480B CN201911165362.5A CN201911165362A CN110943480B CN 110943480 B CN110943480 B CN 110943480B CN 201911165362 A CN201911165362 A CN 201911165362A CN 110943480 B CN110943480 B CN 110943480B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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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Abstract
The embodiment of the invention discloses a power system frequency modulation method, a power system frequency modulation device, computer equipment and a storage medium. The method comprises the following steps: setting the lowest rotating speed of the fans at different wind speeds, and performing group control on the fans; controlling the DFIG to stably operate in an overspeed load shedding mode, and detecting the system frequency of the power system in real time; if the system frequency deviation amount of the power system is detected to be larger than a preset deviation amount threshold value, determining an active power reference value of the power system according to the lowest rotating speed of the fan, the current rotating speed of the fan, the system frequency deviation amount of the power system, the current network time delay of the power system and a frequency sampling difference value; judging whether the rotating speed of the fan is lower than a preset minimum rotating speed or not; if the rotating speed of the fan is lower than the lowest rotating speed, the fan is controlled to be switched to the rotating speed recovery module so as to improve the rotating speed of the fan, and therefore the DFIG can participate in frequency modulation according to self-adaptive adjusting parameters and keep good performance under the condition that network communication uncertainty exists.
Description
Technical Field
The invention relates to the technical field of frequency modulation, in particular to a method and a device for modulating the frequency of a power system, computer equipment and a storage medium.
Background
In recent years, with the increasing severity of energy shortage, environmental pollution and other problems, wind power generation has been rapidly developed. However, as the proportion of wind power generation in the power system is larger and larger, a series of problems are caused to occur. The frequency stability is an important condition for stable operation of a power grid, but the DFIG (double-fed induction generator) which is most widely applied to the wind power plant at present does not have a frequency modulation function due to the working characteristics of the DFIG, so that the frequency stability and the frequency modulation capability of a power system are concerned by people with the continuous increase of the scale of wind power integration. The DFIG is different from a traditional synchronous motor, in order to pursue maximum wind power capture, the rotor speed and the grid frequency of the DFIG are decoupled, and the DFIG cannot automatically participate in system frequency modulation. In the power system, in a frequency event, the dynamic power grid frequency response is supported by the system inertia at first, and because the wind power plant cannot respond to the power grid frequency, the grid connection reduces the system inertia, so that the frequency modulation problem is increasingly highlighted.
In addition, power systems are evolving at high speed towards smart grids. With the advent of devices such as PMU (phasor measurement unit), WAMS (model wide-area measurement system) and WAPS (wide-area power system) are gradually being formed. Under the WAPS, information interaction and machine communication are transmitted through a network, so that in the context of rapid development of power information physical systems, the influence of network uncertainty, such as network delay, packet loss and the like, on the control performance is considered in the design of the controller. With the innovation of technology, the power system is also developed towards large scale and complication. The grid connection and transmission distance of the wind power plant can also affect the performance of network transmission.
In summary, the problem of frequency regulation based on wind farm integration is getting more and more attentive, and thus the various situations of traction are also considered in parallel to pursue the best control effect. Currently, there are many studies on the participation of the DFIG in system frequency modulation, such as droop control, inertial control or additional energy management systems, in supporting wind farms at frequency events. However, the methods basically do not consider the operating state of the wind turbine and the existence of uncertainty of network communication, but the methods influence the performance of the wind power plant participating in system frequency modulation in actual operation.
Disclosure of Invention
The embodiment of the invention provides a power system frequency modulation method, a device, computer equipment and a storage medium, which aim to solve the problems that: under the condition that network communication uncertainty (such as time delay) exists in the WAPS, how to enable the DFIG in the wind power plant to participate in the primary frequency modulation of the system according to self-adaptive adjustment parameters of the running state of the DFIG and keep good performance.
In a first aspect, an embodiment of the present invention provides a power system frequency modulation method, which includes:
setting the lowest rotating speed of the fans at different wind speeds, and performing group control on the fans;
controlling the DFIG to stably operate in an overspeed load shedding mode, and detecting the system frequency of the power system in real time;
if the system frequency deviation delta f of the power system is detected to be larger than a preset deviation threshold value, the lowest rotating speed omega of the fan is usedminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemref；
Judging whether the rotating speed of the fan is lower than a preset minimum rotating speed or not;
and if the rotating speed of the fan is lower than the preset lowest rotating speed, controlling the fan to be switched to a rotating speed recovery module so as to improve the rotating speed of the fan.
In a second aspect, an embodiment of the present invention further provides a power system frequency modulation apparatus, which includes:
the setting unit is used for setting the lowest rotating speed of the fan at different wind speeds and performing grouping control on the fan;
the first control unit is used for controlling the DFIG to stably operate in an overspeed load shedding mode and detecting the system frequency of the power system in real time;
a determining unit, configured to determine, according to a minimum rotation speed ω of the fan, if it is detected that a system frequency deviation Δ f of the power system is greater than a preset deviation thresholdminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemref；
The judging unit is used for judging whether the rotating speed of the fan is lower than a preset minimum rotating speed or not;
and the second control unit is used for controlling the fan to be switched to the rotating speed recovery module if the rotating speed of the fan is lower than the preset lowest rotating speed so as to improve the rotating speed of the fan.
In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the above method when executing the computer program.
In a fourth aspect, the present invention also provides a computer-readable storage medium, which stores a computer program, and the computer program can implement the above method when being executed by a processor.
According to the frequency modulation method for the power system, provided by the embodiment of the invention, the lowest running rotating speed of the fans is set at first, and the safe running of the fans is ensured by grouping. Secondly, for the control scheme, overspeed load shedding and droop control are combined to enable the fan to have a better supporting effect on frequency events. Wherein, for droop control, its droop coefficient (i.e. active power reference value P)ref) Then according to the current rotation speed omega of the fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhAnd (6) setting. Therefore, for the fans in different operation states, the controller can adjust the kinetic energy of the fans in the group according to the kinetic energy, so that the fans can operate in a safe range, and secondary frequency reduction is prevented. In addition, a frequency sampling difference value delta f is added to the tuninghThe controller can respond to the frequency change faster and better at the initial stage of the frequency event, so as to achieve the best effect of increasing the frequency low point.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a frequency modulation method for an electrical power system according to an embodiment of the present invention;
FIG. 2 shows P corresponding to different rotation speeds at different wind speeds in a power system frequency modulation method according to an embodiment of the present inventionmA graph of rate of change;
fig. 3 is a diagram illustrating minimum rotation speed settings at different wind speeds according to a method for frequency modulation of an electrical power system according to an embodiment of the present invention;
fig. 4 is a control block diagram of a WAPS of a power system frequency modulation method according to an embodiment of the present invention;
fig. 5 is a WAPS block diagram of a power system frequency modulation method according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of a frequency modulation apparatus of an electrical power system according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a frequency modulation apparatus of a power system according to another embodiment of the present invention;
fig. 8 is a schematic block diagram of a determination unit of a power system frequency modulation device according to an embodiment of the present invention;
FIG. 9 is a schematic block diagram of a computer apparatus provided by an embodiment of the present invention;
fig. 10 is a simulation frequency result diagram of an example of a frequency modulation method of an electric power system according to an embodiment of the present invention;
FIG. 11 is a simulated DFIG rotation speed diagram of an example of a method for frequency modulation of a power system according to an embodiment of the invention;
fig. 12 is a simulation frequency result diagram of another example of the frequency modulation method of the power system according to the embodiment of the invention;
fig. 13 is a simulated DFIG rotation speed diagram of another example of the power system frequency modulation method according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Referring to fig. 1, fig. 1 is a schematic flow chart of a frequency modulation method for a power system according to an embodiment of the present invention. As shown, the method includes the following steps S1-S5.
And S1, setting the lowest rotating speed of the fans at different wind speeds, and performing group control on the fans.
In specific implementation, the lowest rotating speeds of the fans at different wind speeds are set, and the fans are controlled in groups.
Referring to FIG. 2, in the operating range of the wind turbine (rotor speed from 0.7 to 1.2pu), the mechanical power P captured by the wind turbine is lower as the rotor speed becomes lowermThe drop is faster. If the kinetic energy of the fan is used to obtain system frequency support, the fan captures less mechanical power than at such low speeds, although the speed can be fixed to operate at a minimum of 0.7puAnd the total output power of the fan is less, so that the fan participates in frequency modulation to cause secondary frequency reduction and has adverse effect.
Therefore, the present invention sets the minimum rotation speed of the fan at different wind speeds through the above step S1.
Referring to FIG. 3, FIG. 3 shows the relationship between the final set minimum rotational speed of the wind turbine and the wind speed captured by the wind turbine.
In addition, the wind power plant is divided into a plurality of control groups according to the wind power level captured by each DFIG for the wind turbine so as to uniformly set the controllers, and the complexity of too many controllers is reduced.
And S2, controlling the DFIG to stably operate in a load shedding state, and continuously detecting the operation state of the DFIG and the system frequency of the power system.
In specific implementation, the DFIG is controlled to stably operate in an overspeed load shedding mode, and the system frequency of the power system is detected in real time.
In order to allow the wind farm to have a reserve margin before a frequency event occurs to cope with the frequency event, the DFIG is initially operated in an overspeed load shedding mode with its output power less than MPPT (maximum power point tracking) mode. It should be noted that in order not to lose economic benefit, the degree of overspeed load shedding needs to be limited to a very small range, which is set at 5% by the practice of the present invention. At this time, the entire power system is in a steady state, the controller always detects the system frequency transmitted from the sensor, and thus determines whether the system frequency deviation amount exceeds a set threshold, if so, the controller starts to execute step S3.
In an embodiment, before step S3, the method further includes: acquiring the current network time delay tau of the power systemsc。
Referring to fig. 4, in the WAPS, system information is discretely transmitted in the form of data packets through a network in a cycle of sensors, controllers, and actuators. For the case considered by the invention, the network uncertainty from controller to actuator is ignored and only the uncertainty from sensor to controller is considered, since the controller itself is located in the wind farm and is therefore very close. The sensor not only connects the power gridAnd sending signals such as frequency to the designed controller, and packaging and sending the time corresponding to the sending signals. Therefore, the time stamp and the current time can be compared and calculated at the front end of the controller to obtain the current network time delay tauscFor the controller to function.
S3, if the system frequency deviation delta f of the power system is detected to be larger than a preset deviation threshold value, according to the lowest rotating speed omega of the fanminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemref。
In specific implementation, if the system frequency deviation delta f of the power system is detected to be greater than a preset deviation threshold, the lowest rotation speed omega of the fan is usedminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemref。
Specifically, the preset minimum rotating speed omega of the current fan is obtainedminAnd obtaining the rotating speed omega of the fan in the current running state according to the grouping condition of the wind power plantrObtaining the system frequency deviation delta f of the power system and the current network time delay tau of the power systemscSum frequency sampling difference Δ fhAnd so on.
The frequency sampling difference value Δ fhBy the following formula: Δ fh＝fh，k-fh，k+1Is determined wherein fh，kFrequency sample value at time k, fh，k+1The sampled value of the frequency at the moment k + 1.
Using Δ fhThe reason for this is that the signal received by the controller is transmitted in data packets as sensor samples, so that the frequency signal is discrete and remains constant until the next new data packet arrives, and therefore the conventional signal system frequency change rate d Δ f/dt, which reflects the frequency change trend, no longer applies. And Δ fhCan alsoThe frequency change trend can be reflected at the initial stage of the frequency event, and the frequency modulation idea is met.
In one embodiment, the following formula Pref＝Pde+ delta P determines the active power reference value P of the power systemrefWherein P isdeIs the initial output power of the DFIG in the load shedding state, and Δ P is the power increment due to droop control.
The power increment Δ P is represented by the following equation Δ P ═ KdelayΔ f determination;
wherein, Kdelay＝A(ωr 2-ωmin 2)(-Δf+1)(τsc+1)(-Δfh+1)/(ωmax 2-ωmin 2) A is a constant proportionality coefficient, omegamaxAt the maximum speed of rotation, ω, of the fanmaxIs preset. In the embodiment of the invention, the value of A is 2.
As can be seen from the above description, the control method first sets the operating minimum rotational speed of the fans and groups them to ensure safe operation of the fans. Secondly, for the control scheme, overspeed load shedding and droop control are combined to enable the fan to have a better supporting effect on frequency events. Wherein, for droop control, its droop coefficient (i.e. active power reference value P)ref) Then according to the current rotation speed omega of the fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhAnd (6) setting. Therefore, for the fans in different operation states, the controller can adjust the kinetic energy of the fans in the group according to the kinetic energy, so that the fans can operate in a safe range, and secondary frequency reduction is prevented. In addition, a frequency sampling difference value delta f is added to the tuninghThe controller can respond to the frequency change faster and better at the initial stage of the frequency event, so as to achieve the best effect of increasing the frequency low point.
Note that Δ f is the frequency of the eventhBefore Δ f.
And S4, judging whether the rotating speed of the fan is lower than the preset lowest rotating speed or not.
In specific implementation, whether the rotating speed of the fan is lower than a preset minimum rotating speed is judged. The minimum rotation speed is set in step S1.
And S5, if the rotating speed of the fan is lower than the preset lowest rotating speed, controlling the fan to be switched to a rotating speed recovery module so as to increase the rotating speed of the fan.
In specific implementation, if the rotating speed of the fan is lower than a preset minimum rotating speed, the fan is controlled to be switched to the rotating speed recovery module so as to increase the rotating speed of the fan.
Referring to fig. 5, a wind farm is placed in a four-machine two-area power system, and a network communication transmission part is implemented by TrueTime (network simulation tool). The frequency event is a load dump event. G1, G2, G3 and G4 are four conventional synchronous power plants equipped with PSS etc. The system standard parameters refer to standard four-zone two-zone power system parameters. The properties of the communication network are set and the time delay is set to verify the validity of the proposed control method. In addition, it is also necessary to set the frequency event, in this example set to L1 or L2 end load to cause the system frequency to drop suddenly at a certain time.
In order to verify the effectiveness of the proposed method, the proposed method is compared and verified with a non-control version and a droop control parameter version of a common fixed parameter, and the final example simulation result verifies the effectiveness of the proposed method.
Referring to fig. 10-11, fig. 10 and 11 show the variation trend of the system frequency and the rotation speed of the DFIG at a wind speed of 10m/s (medium-low wind speed) and a time delay of 0.18s in one embodiment, respectively.
Referring to fig. 12-13, fig. 12 and 13 show the variation trend of the system frequency and the rotation speed of the DFIG at a wind speed of 11.5m/s (medium and high wind speed) and a time delay of 0.45s in another embodiment, respectively.
Fig. 6 is a schematic block diagram of a frequency modulation apparatus 80 of an electrical power system according to an embodiment of the present invention. As shown in fig. 6, the present invention further provides a power system frequency modulation apparatus 80 corresponding to the above power system frequency modulation method. The power system frequency modulation apparatus 80 includes a unit for executing the power system frequency modulation method, and the apparatus 80 may be configured in a desktop computer, a tablet computer, a laptop computer, a controller, or other terminals. Specifically, referring to fig. 6, the power system frequency modulation apparatus 80 includes a setting unit 81, a first control unit 82, a determining unit 83, a determining unit 84, and a second control unit 85.
The setting unit 81 is used for setting the lowest rotating speed of the fans at different wind speeds and performing grouping control on the fans;
the first control unit 82 is used for controlling the DFIG to stably operate in an overspeed load shedding mode and detecting the system frequency of the power system in real time;
a determining unit 83, configured to determine, according to a minimum rotation speed ω of the fan, if it is detected that the system frequency deviation Δ f of the power system is greater than a preset deviation thresholdminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemref；
A judging unit 84, configured to judge whether the rotation speed of the fan is lower than a preset minimum rotation speed;
and the second control unit 85 is configured to control the fan to be switched to the rotation speed recovery module if the rotation speed of the fan is lower than a preset minimum rotation speed, so as to increase the rotation speed of the fan.
Referring to fig. 7, in an embodiment, the power system frequency modulation device 80 further includes an obtaining unit 86.
An obtaining unit 86, configured to obtain a current network delay τ of the power systemsc。
In one embodiment, the frequency sample difference Δ fhBy the following formula: Δ fh＝fh，k-fh，k+1Is determined wherein fh，kFrequency sample value at time k, fh，k+1The sampled value of the frequency at the moment k + 1.
Referring to fig. 8, in an embodiment, the determining unit 83 includes a calculating unit 831.
A calculating unit 831 for passing the following formula Pref＝Pde+ delta P determines the active power reference value P of the power systemrefWherein P isdeIs the initial output power of the DFIG in the load shedding state, and Δ P is the power increment due to droop control.
In one embodiment, the power increment Δ P is represented by the following formula Δ P ═ KdelayΔ f determination;
wherein, Kdelay＝A(ωr 2-ωmin 2)(-Δf+1)(τsc+1)(-Δfh+1)/(ωmax 2-ωmin 2) A is a constant proportionality coefficient, omegamaxThe maximum rotation speed of the fan.
It should be noted that, as can be clearly understood by those skilled in the art, the specific implementation process of the frequency modulation device 80 and each unit of the power system may refer to the corresponding description in the foregoing method embodiment, and for convenience and brevity of description, no further description is provided herein.
The power system frequency modulation device may be implemented in the form of a computer program that can be run on a computer device as shown in fig. 9.
Referring to fig. 9, fig. 9 is a schematic block diagram of a computer device according to an embodiment of the present application. The computer device 500 may be a terminal or a server, where the terminal may be an electronic device with a communication function, such as a smart phone, a tablet computer, a notebook computer, a desktop computer, a personal digital assistant, and a wearable device. The server may be an independent server or a server cluster composed of a plurality of servers.
Referring to fig. 9, the computer device 500 includes a processor 502, memory, and a network interface 505 connected by a system bus 501, where the memory may include a non-volatile storage medium 503 and an internal memory 504.
The non-volatile storage medium 503 may store an operating system 5031 and a computer program 5032. The computer program 5032, when executed, causes the processor 502 to perform a power system frequency tuning method.
The processor 502 is used to provide computing and control capabilities to support the operation of the overall computer device 500.
The internal memory 504 provides an environment for the operation of the computer program 5032 in the non-volatile storage medium 503, and when the computer program 5032 is executed by the processor 502, the processor 502 may perform a power system frequency modulation method.
The network interface 505 is used for network communication with other devices. Those skilled in the art will appreciate that the configuration shown in fig. 9 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation of the computer device 500 to which the present application may be applied, and that a particular computer device 500 may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
Wherein the processor 502 is configured to run the computer program 5032 stored in the memory to implement the following steps:
setting the lowest rotating speed of the fans at different wind speeds, and performing group control on the fans;
controlling the DFIG to stably operate in an overspeed load shedding mode, and detecting the system frequency of the power system in real time;
if the system frequency deviation delta f of the power system is detected to be larger than a preset deviation threshold value, the lowest rotating speed omega of the fan is usedminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemref；
Judging whether the rotating speed of the fan is lower than a preset minimum rotating speed or not;
and if the rotating speed of the fan is lower than the preset lowest rotating speed, controlling the fan to be switched to a rotating speed recovery module so as to improve the rotating speed of the fan.
In one embodiment, processor 502 is implementing the describedAccording to the lowest rotating speed omega of the fanminCurrent rotation speed omega of fanrSystem frequency deviation delta f of electric power system and current network time delay tau of electric power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefWhen the steps are carried out, the following steps are concretely realized:
by the following formula Pref＝Pde+ delta P determines the active power reference value P of the power systemrefWherein P isdeIs the initial output power of the DFIG in the load shedding state, and Δ P is the power increment due to droop control.
In one embodiment, the processor 502 is implementing the minimum speed ω according to the wind turbineminCurrent rotation speed omega of fanrSystem frequency deviation delta f of electric power system and current network time delay tauscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefBefore the steps, the following steps are also realized:
acquiring the current network time delay tau of the power systemsc。
It should be understood that in the embodiment of the present Application, the processor 502 may be a Central Processing Unit (CPU), and the processor 502 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable gate arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will be understood by those skilled in the art that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware. The computer program may be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the flow steps of the embodiments of the method described above.
Accordingly, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program. The computer program, when executed by a processor, causes the processor to perform the steps of:
setting the lowest rotating speed of the fans at different wind speeds, and performing group control on the fans;
controlling the DFIG to stably operate in an overspeed load shedding mode, and detecting the system frequency of the power system in real time;
if the system frequency deviation delta f of the power system is detected to be larger than a preset deviation threshold value, the lowest rotating speed omega of the fan is usedminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemref；
Judging whether the rotating speed of the fan is lower than a preset minimum rotating speed or not;
and if the rotating speed of the fan is lower than the preset lowest rotating speed, controlling the fan to be switched to a rotating speed recovery module so as to improve the rotating speed of the fan.
In an embodiment, the processor implements the lowest rotational speed ω of the fan according to the fan by executing the computer programminCurrent rotation speed omega of fanrSystem frequency deviation delta f of electric power system and current network time delay tau of electric power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefWhen the steps are carried out, the following steps are concretely realized:
by the following formula Pref＝Pde+ delta P determines the active power reference value P of the power systemrefWherein P isdeIs the initial output power of the DFIG in the load shedding state, and Δ P is the power increment due to droop control.
In an embodiment, the processor implements the lowest rotation according to the wind turbine when executing the computer programSpeed omegaminCurrent rotation speed omega of fanrSystem frequency deviation delta f of electric power system and current network time delay tauscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefBefore the steps, the following steps are also realized:
acquiring the current network time delay tau of the power systemsc。
The storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, which can store various computer readable storage media.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative. For example, the division of each unit is only one logic function division, and there may be another division manner in actual implementation. For example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, while the invention has been described with respect to the above-described embodiments, it will be understood that the invention is not limited thereto but may be embodied with various modifications and changes.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A power system frequency modulation method is applied to a power system, and comprises the following steps:
setting the lowest rotating speed of the fans at different wind speeds, and performing group control on the fans;
controlling the DFIG to stably operate in an overspeed load shedding mode, and detecting the system frequency of the power system in real time;
if the system frequency deviation delta f of the power system is detected to be larger than a preset deviation threshold value, the lowest rotating speed omega of the fan is usedminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefThe active power reference value PrefThe droop coefficient of the power system during droop control is obtained;
judging whether the rotating speed of the fan is lower than a preset minimum rotating speed or not;
if the rotating speed of the fan is lower than the preset lowest rotating speed, controlling the fan to be switched to a rotating speed recovery module so as to improve the rotating speed of the fan;
wherein the frequency sampling difference value Δ fhBy the following formula: Δ fh＝fh，k-fh，k+1Is determined wherein fh，kFrequency sample value at time k, fh，k+1A frequency sampling value at the moment k + 1;
the lowest rotating speed omega according to the fanminCurrent rotation speed omega of fanrSystem frequency deviation delta f of electric power system and current network time delay tau of electric power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefThe method comprises the following steps:
by the following formula Pref＝Pde+ delta P determines the active power reference value P of the power systemrefWherein P isdeIs the initial output power of the DFIG in the load shedding state, and Δ P is the power increment due to droop control;
the power increment Δ P is represented by the following equation Δ P ═ KdelayΔ f determination;
wherein, Kdelay＝A(ωr 2-ωmin 2)(-Δf+1)(τsc+1)(-Δfh+1)/(ωmax 2-ωmin 2) A is a constant proportionality coefficient, omegamaxThe maximum rotation speed of the fan.
2. Method for frequency modulation of an electric power system according to claim 1, characterized in that said minimum rotational speed ω of the wind turbine is determined according to said minimum rotational speed ω of the wind turbineminCurrent rotation speed omega of fanrSystem frequency deviation delta f of electric power system and current network time delay tauscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefPreviously, the method further comprises:
acquiring the current network time delay tau of the power systemsc。
3. An electric power system frequency modulation apparatus, comprising:
the setting unit is used for setting the lowest rotating speed of the fan at different wind speeds and performing grouping control on the fan;
the first control unit is used for controlling the DFIG to stably operate in an overspeed load shedding mode and detecting the system frequency of the power system in real time;
a determining unit, configured to determine, according to a minimum rotation speed ω of the fan, if it is detected that a system frequency deviation Δ f of the power system is greater than a preset deviation thresholdminCurrent rotation speed omega of fanrThe system frequency deviation delta f of the power system and the current network time delay tau of the power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefThe active power reference value PrefThe droop coefficient of the power system during droop control is obtained;
the judging unit is used for judging whether the rotating speed of the fan is lower than a preset minimum rotating speed or not;
the second control unit is used for controlling the fan to be switched to the rotating speed recovery module if the rotating speed of the fan is lower than the preset lowest rotating speed so as to improve the rotating speed of the fan;
wherein the frequency sampling difference value Δ fhBy the following formula: Δ fh＝fh，k-fh，k+1Is determined in which，fh，kFrequency sample value at time k, fh，k+1A frequency sampling value at the moment k + 1;
the lowest rotating speed omega according to the fanminCurrent rotation speed omega of fanrSystem frequency deviation delta f of electric power system and current network time delay tau of electric power systemscAnd the frequency sampling difference value deltafhDetermining an active power reference value P of a power systemrefThe method comprises the following steps:
by the following formula Pref＝Pde+ delta P determines the active power reference value P of the power systemrefWherein P isdeIs the initial output power of the DFIG in the load shedding state, and Δ P is the power increment due to droop control;
the power increment Δ P is represented by the following equation Δ P ═ KdelayΔ f determination;
wherein, Kdelay＝A(ωr 2-ωmin 2)(-Δf+1)(τsc+1)(-Δfh+1)/(ωmax 2-ωnin 2) A is a constant proportionality coefficient, omegamaxThe maximum rotation speed of the fan.
4. A power system frequency modulation apparatus according to claim 3, further comprising:
an obtaining unit, configured to obtain a current network delay τ of the power systemsc。
5. A computer arrangement, characterized in that the computer arrangement comprises a memory having stored thereon a computer program and a processor implementing the method according to any of claims 1-2 when executing the computer program.
6. A computer-readable storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the method according to any one of claims 1-2.
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