CN115986848A - Method and device for controlling variable power tracking characteristic of fan based on inertia demand - Google Patents
Method and device for controlling variable power tracking characteristic of fan based on inertia demand Download PDFInfo
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Abstract
The application is suitable for the technical field of wind power, and provides a method and a device for controlling variable power tracking characteristics of a fan based on inertia requirements. The method comprises the following steps: calculating the required rotating speed variation of the fan according to the inertia requirement of the power system on the fan; calculating the change time when the variable quantity of the frequency of the power system reaches the preset frequency deviation according to the frequency response when the power system is disturbed; and determining a novel proportionality coefficient of a power tracking curve of the fan according to the change time and the required rotating speed variation, so that the fan generates extra active power according to the novel proportionality coefficient within the change time to participate in the inertial response of the power system. The inertia response capability of the fan can be effectively improved, and the active output of the fan after the power system is disturbed can meet the inertia requirement of the power system.
Description
Technical Field
The application relates to the technical field of wind power, in particular to a method and a device for controlling variable power tracking characteristics of a fan based on inertia requirements.
Background
The rotational speed of a wind driven generator (hereinafter referred to as a fan) is decoupled from the frequency of a power grid, so that inertia cannot be provided for a power system, and the inertia can measure the capacity of hindering sudden frequency change of the power system. Therefore, the effective inertia of the power system is reduced due to the large-scale fan grid connection, and hidden dangers are brought to the safe operation of the power grid.
In order to solve the above-mentioned problems, researchers have proposed a virtual inertia control method, such as a conventional additional inertia control, which enables the wind turbine to generate a coupling relationship with the power grid. Taking frequency drop as an example, when the traditional additional inertia control is adopted and a power system is disturbed, active power generated by a fan due to frequency mutation is added on an active power reference value of maximum power tracking, the fan releases rotor kinetic energy to provide active power support for the power system, and the rotating speed of a rotor of the fan is reduced. However, in the maximum power tracking area, the rotating speed of the fan drops to reduce the active power reference value, so that the active power output of the fan cannot meet the inertia requirement of the power system. Therefore, in order to solve the contradiction between the two, and eliminate the mutual restriction of the traditional additional inertia control and the maximum power tracking control, a variable power tracking characteristic control method is urgently needed.
Disclosure of Invention
In view of this, the embodiment of the present application provides a method and an apparatus for controlling a variable power tracking characteristic of a wind turbine based on an inertia demand, so as to solve a technical problem that an active power output of the wind turbine in a conventional virtual inertia control method cannot meet the inertia demand of a power system.
In a first aspect, an embodiment of the present application provides a method for controlling a variable power tracking characteristic of a fan based on an inertia demand, including: calculating the required rotating speed variation of the fan according to the inertia requirement of the power system on the fan; calculating the change time when the variable quantity of the frequency of the power system reaches the preset frequency deviation according to the frequency response when the power system is disturbed; and determining a novel proportionality coefficient of a power tracking curve of the fan according to the change time and the required rotating speed variation, so that the fan generates extra active power according to the novel proportionality coefficient within the change time to participate in the inertial response of the power system.
In a possible implementation manner of the first aspect, determining a new scaling factor of a power tracking curve of a wind turbine according to a change time and a change amount of a required rotation speed includes: determining a rotor motion expression of the fan in the maximum power tracking area according to the active power of the fan in the maximum power tracking area; and performing integral operation on the rotor motion expression based on the change time and the required rotating speed variation to determine a novel proportional coefficient of a power tracking curve of the fan.
In one possible embodiment of the first aspect, the rotor motion expression is:
in the formula, k t Is a new scale factor, k opt Controlling the proportionality coefficient, omega, for maximum power tracking of a fan r Is the real-time rotating speed of the fan,
the active power of the fan under the power tracking control of the novel proportionality coefficient after the power system is disturbed is selected, and the fan is selected>
The active power H of the fan in the maximum power tracking area before the power system is disturbed w Is the inherent inertia time constant of the fan, and t is time; and (3) performing integral operation on the rotor motion expression:
in the formula, t f To vary the time, ω r0 Is the initial speed of the fan, omega r1 ＝ω r0 +Δω r ，Δω r Is the required rotation speed variation; the novel scaling factor is expressed as:
in one possible implementation of the first aspect, the inertia demand of the power system on the wind turbine is a virtual inertia time constant of the wind turbine; the expression of the virtual inertia time constant of the fan is as follows:
in the formula, H v Is the virtual inertia time constant, Δ ω, of the fan r For the required speed variation, ω e For synchronous speed of the grid, Δ ω e For synchronous speed variation of the power system, ω r0 Is the initial speed of the fan, H w Is the inherent inertia time constant of the fan; determining the required rotating speed variation as follows according to the expression of the virtual inertia time constant of the fan:
in one possible implementation of the first aspect, the frequency response is expressed as:
in the formula, H g Is inertia time constant of the power system, Δ f (t) is preset frequency deviation, t is time, Δ P L As a disturbance amount of load, D s Is a damping coefficient; delta P m To send out synchronouslyThe mechanical power variation of the motor can be expressed as:
in the formula, K s For the primary frequency-modulation coefficient, T, of the synchronous generator G Delaying the primary frequency modulation of the synchronous generator; based on the frequency response and the mechanical power variation of the synchronous generator, the variation time is determined according to the preset frequency deviation.
In one possible implementation of the first aspect, the method further comprises: determining a recovery proportionality coefficient of a power tracking curve of the fan according to the novel proportionality coefficient and a maximum power tracking control proportionality coefficient of the fan, so that the fan is smoothly switched to maximum power tracking control according to the recovery proportionality coefficient within recovery time; the recovery time is a time when the variation of the frequency of the power system reaches a preset frequency deviation and then gradually decreases to 0.
In one possible implementation of the first aspect, the recovery scale factor is expressed as:
in the formula, k tt To recover the scale factor, k t Is a new scale factor, k opt Controlling a proportional coefficient for maximum power tracking of the fan, wherein delta f (t) is a preset frequency deviation, and delta f max The maximum value of the frequency deviation of the power system.
In a second aspect, an embodiment of the present application provides a fan variable power tracking characteristic control apparatus based on an inertia demand, including:
the first calculation module is used for calculating the required rotating speed variation of the fan according to the inertia requirement of the power system on the fan.
And the second calculation module is used for calculating the change time when the change quantity of the frequency of the power system reaches the preset frequency deviation according to the frequency response when the power system is disturbed.
And the determining module is used for determining a novel proportionality coefficient of a power tracking curve of the fan according to the change time and the required rotating speed variation, so that the fan generates extra active power according to the novel proportionality coefficient within the change time to participate in the inertial response of the power system.
In a third aspect, an embodiment of the present application provides an electronic device, which includes a memory and a processor, where the memory stores a computer program that is executable on the processor, and the processor, when executing the computer program, implements the method for controlling a variable power tracking characteristic of a wind turbine based on an inertia demand according to any one of the first aspect.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for controlling a variable power tracking characteristic of a wind turbine based on an inertia demand according to any one of the first aspect is implemented.
In a fifth aspect, the present application provides a computer program product, which when run on an electronic device, causes the electronic device to execute the method for controlling a variable power tracking characteristic of a wind turbine based on an inertia demand according to any one of the above first aspects.
It is understood that the beneficial effects of the second aspect to the fifth aspect can be referred to the related description of the first aspect, and are not described herein again.
The method and the device for controlling the variable power tracking characteristic of the fan based on the inertia demand achieve the change time of the preset frequency deviation by calculating the variation of the required rotating speed of the fan and the variation of the frequency of the electric power system, and further calculate the novel proportionality coefficient of the power tracking curve of the fan, so that when the electric power system is disturbed, the fan generates active power according to the power tracking curve of the novel proportionality coefficient, the inertia response capacity of the fan is effectively improved, and the active output of the fan after the electric power system is disturbed meets the inertia demand of the electric power system.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the specification.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flowchart of a method for controlling a variable power tracking characteristic of a wind turbine based on an inertia demand according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a power tracking curve switching principle provided by an embodiment of the present application;
FIG. 3 is a topology diagram of a simulation system;
FIG. 4 is a schematic diagram of a frequency response curve of the power system after a disturbance of the simulation system;
FIG. 5 is a schematic diagram of a fan speed response curve after a simulation system is disturbed;
FIG. 6 is a schematic structural diagram of a variable power tracking characteristic control device of a wind turbine based on inertia demand according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The present application will be more clearly described below with reference to specific examples. The following examples will assist those skilled in the art in further understanding the role of the present application, but are not intended to limit the application in any way. It should be noted that numerous variations and modifications could be made by those skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
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 should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
In the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In addition, "a plurality" mentioned in the embodiments of the present application should be construed as two or more.
Fig. 1 is a schematic flow chart of a method for controlling a variable power tracking characteristic of a wind turbine based on an inertia demand according to an embodiment of the present application. As shown in fig. 1, the method in the embodiment of the present application may include:
The inertia requirement of the power system on the fan is a virtual inertia time constant of the fan, and the virtual inertia time constant can be set according to the requirement. The wind turbine can be a double-fed wind driven generator.
The expression of the virtual inertia time constant of the fan is as follows:
in the formula, H v Is the virtual inertia time constant, Δ ω, of the fan r For the required speed variation, ω e For synchronous speed of the grid, Δ ω e For synchronous speed variation of the power system, ω r0 Is the initial speed of the fan, H w Is the inherent inertial time constant of the fan.
In general, the rotation speed adjustment amount of the fan is larger than the synchronous rotation speed variation amount of the power system, so that the fan can virtualize an inertia time constant larger than the inherent inertia time constant of the fan, and compared with a synchronous generator, the fan can be adjusted in a wider rotation speed variation range, and can virtualize an inertia time constant not lower than the synchronous generator.
Determining the required rotating speed variation quantity as follows according to the formula (1):
in the formula,. DELTA.omega r Is the required rotational speed variation.
And 102, calculating the change time when the change quantity of the frequency of the power system reaches the preset frequency deviation according to the frequency response when the power system is disturbed.
Alternatively, when a load disturbance occurs to the power system, the frequency response of the power system may be expressed as:
in the formula, H g Δ f (t) is a predetermined frequency deviation, Δ P, which is an inertia time constant of the power system L As a disturbance amount of load, D s Is the damping coefficient, t is time; delta P m For the variation of the mechanical power of the synchronous generator, with the primary frequency modulation factor of the synchronous generator and the synchronous generatorThe primary frequency modulation delay of the motor is related and can be expressed as:
in the formula, K s For the primary frequency-modulation coefficient, T, of the synchronous generator G For synchronous generator primary frequency modulation delay, s represents laplace transform.
Substituting the formula (4) into the formula (3) to calculate a frequency deviation expression:
wherein the content of the first and second substances,
based on the frequency response and the mechanical power variation of the synchronous generator, the variation time is determined according to the preset frequency deviation.
Optionally, the preset frequency deviation may be an allowable value of a normal frequency deviation of the power system, that is, the preset frequency deviation may be 0.5Hz. Substituting the preset frequency deviation of 0.5Hz into the formula (5) to calculate t as 2 seconds, namely the change time t f 2 seconds, that is to say 2 seconds, the time required for the frequency of the power system to rise or fall by 0.5Hz when the power system is disturbed.
And 103, determining a novel proportionality coefficient of a power tracking curve of the fan according to the change time and the required rotating speed variation, so that the fan generates extra active power according to the novel proportionality coefficient within the change time to participate in inertial response of the power system.
In a possible implementation manner, the determining a new scaling factor of the power tracking curve of the wind turbine in step 103 according to the change time and the change amount of the required rotation speed may specifically include:
and step 1031, determining a rotor motion expression of the fan in the maximum power tracking area according to the active power of the fan in the maximum power tracking area.
And 1032, performing integral operation on the rotor motion expression based on the change time and the required rotating speed variation, and determining a novel proportional coefficient of a power tracking curve of the fan.
Optionally, before the power system is disturbed, the calculation formula of the active power of the wind turbine may be represented as:
in the formula, P ref Active power of the wind turbine before the power system is disturbed, k opt Tracking and controlling a proportionality coefficient for the maximum power of the fan; omega 0 The minimum rotation speed, omega, when the fan is in the maximum power tracking area 1 The maximum rotation speed, omega, when the fan is in the maximum power tracking area r The real-time rotating speed of the fan; p max Is the output power amplitude limit value of the fan, omega max The rotation speed limiting value of the fan.
For example, after the power system is disturbed, the calculation formula of the active power of the wind turbine can be expressed as:
in the formula, P ref1 Is the active power k of the fan after the power system is disturbed t Is a novel proportionality coefficient.
Alternatively, according to equations (6) and (7), the rotor motion expression may be:
in the formula, k t Is a new scale factor, k opt Controlling the proportionality coefficient, omega, for maximum power tracking of a fan r Is the real-time rotating speed of the fan,
the active power of the fan under the power tracking control of the novel proportionality coefficient after the power system is disturbed is selected, and the fan is selected>
The active power H of the fan in the maximum power tracking area before the power system is disturbed w Is the inherent inertia time constant of the fan, and t is time. Among them, the power tracking control of the new scale factor is also called variable power tracking control, and is also called variable power tracking characteristic control.
And (3) simultaneously performing integral operation on two sides of the rotor motion expression:
in the formula, t f To vary the time, ω r0 Is the initial speed of the fan, omega r1 ＝ω r0 +Δω r ，Δω r Is the required rotational speed variation. The new scale factor is obtained as:
the novel proportionality coefficient obtained by formula (9), that is, the novel proportionality coefficient of the power tracking curve of the fan, enables the power tracking curve of the fan to satisfy the requirement that the fan reaches the expected required rotation speed variation within the variation time after the power system receives the disturbance, that is, the active power output of the fan can satisfy the inertia requirement of the power system after the power system receives the disturbance.
Specifically, referring to FIG. 2, the abscissa of FIG. 2 is the real-time rotational speed ω of the wind turbine r The ordinate is the output power P of the fan e . For example, when the power system is stable, the fan is in maximum power tracking control and the rotation speed of the fan is stable. When the power system is disturbed by a load, the frequency of the power system is greatly changed in the initial stage of disturbanceAnd when the frequency change rate of the power system exceeds 0.5Hz/s, the fan is switched to a novel proportionality coefficient of a power tracking curve from the maximum power tracking control proportionality coefficient, namely, the maximum power tracking control is switched to variable power tracking control. Because of the inertia of the rotor of the fan, the rotating speed of the fan can not change suddenly at the initial stage of disturbance, and the active power of the fan is increased suddenly under the condition that the rotating speed is not changed, namely the operating point of the fan is rapidly moved from A1 to A2, and the active power output by the fan is also changed from P A1 Is raised to P A2 And the mechanical power of the fan is smaller than the active power, so that the rotor of the fan starts to decelerate, and the released kinetic energy of the rotor realizes the power support of the power system.
Along with the reduction of the rotating speed of the fan, the output power of the fan can be reduced along a power tracking curve of a novel proportionality coefficient, the operating point of the fan is gradually moved to A3 from A2, the mechanical power and the active power of the fan reach balance at the moment, the rotating speed of the fan is reduced to an expected rotating speed, the fan is recovered to be controlled by maximum power tracking, and the fan is switched to be controlled by the maximum power tracking curve.
As can be seen from the foregoing, when the fan increases or decreases from the initial speed of the fan along the power tracking curve of the fan to the desired required speed variation, the fan needs to switch to the maximum power tracking curve again. If the maximum power tracking curve is directly switched to, the operating point of the fan rapidly moves from A3 to A4 (refer to fig. 2), which causes a secondary frequency drop. For smooth recovery to maximum power tracking control and avoidance of secondary falling of frequency, the method for controlling variable power tracking characteristics of a fan based on inertia requirements, provided by the embodiment of the application, may further specifically include:
and determining a recovery proportionality coefficient of a power tracking curve of the fan according to the novel proportionality coefficient and the maximum power tracking control proportionality coefficient of the fan, so that the fan is smoothly switched to maximum power tracking control according to the recovery proportionality coefficient within recovery time.
The recovery time is a time (the recovery time does not include the change time) after the variation of the frequency of the power system reaches the preset frequency deviation and gradually decreases to 0.
Alternatively, the recovery scaling factor may be expressed as:
in the formula, k tt To recover the scale factor, k t Is a new scale factor, k opt Controlling a proportional coefficient for maximum power tracking of the fan, wherein delta f (t) is a preset frequency deviation, and delta f max The maximum value of the frequency deviation of the power system.
In the switching control, an allowable value of normal frequency deviation of the power system can be introduced, namely, a preset frequency deviation is introduced, and then the change of the recovery ratio coefficient is controlled through the gradual change of the frequency deviation of the fan, so that the frequency disturbance condition of the fan caused by active power sudden change is avoided.
The embodiment of the application provides a variable power tracking characteristic control method of fan based on inertia demand, the change time of presetting the frequency deviation is reached through the change volume of the demand rotational speed of calculation fan and the frequency of electric power system, and then calculate the novel proportionality coefficient of the power tracking curve of fan, make electric power system when receiving the disturbance, the fan produces extra active power according to the power tracking curve of novel proportionality coefficient in the change time, effectively improve the inertial response ability of fan, make the active output of fan satisfy electric power system's inertial demand, and the fan recovers to maximum power tracking control according to recovering proportionality coefficient smoothness in the recovery time, avoid the secondary of frequency to fall.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
In order to verify the effectiveness and feasibility of the variable power tracking characteristic control method of the wind turbine based on the inertia requirement, a three-machine simulation system incorporated in a wind power plant is built based on a MATLAB/Simulink simulation platform, and FIG. 3 is a topological diagram of the simulation system. The simulation system comprises a synchronous generator G1 with the capacity of 200MVA, a synchronous generator G2 with the capacity of 300MVA and a double-fed wind driven generator DFIG with the total installed capacity of 300MVA, wherein a fan transmits active power to a power grid through an RSC (rotor side converter) and a GSC (grid side converter), the wind power permeability is 37.5%, and the load sudden-increase is set to be 20% at the moment of t =10 s.
Virtual inertia time constant H of air taking machine v 9 seconds, the intrinsic inertia time constant H of the fan w 3.75 seconds, the initial rotation speed omega of the fan r0 Is 0.82pu, and the required rotation speed variation delta omega is obtained by calculation according to the formula (2) r 0.03pu. Taking the time of change t f 2 seconds, the maximum power tracking control proportionality coefficient k of the fan opt Is 1/1.2 3 The new scaling factor of the power tracking curve calculated according to equation (10) is 0.75.
Fig. 4 is a schematic diagram of a frequency response curve of the power system after a disturbance of the simulation system occurs, wherein the abscissa represents time t and the ordinate represents real-time frequency f of the power system. FIG. 5 is a schematic diagram of a fan speed response curve after a simulation system is disturbed, wherein the abscissa represents time t and the ordinate represents a real-time fan speed ω r . As can be seen from fig. 4 and 5, when the initial rotational speed of the fan is 0.822pu, the maximum rotational speed variation of the fan in the variation time is 0.036pu, and the maximum inertia is 9.38 seconds, which are respectively close to the calculated required rotational speed variation and the virtual inertia time constant, which indicates the effectiveness and feasibility of the fan variable power tracking characteristic control method based on the inertia demand provided in the embodiment of the present application.
Fig. 6 is a schematic structural diagram of a variable power tracking characteristic control device of a fan based on an inertia demand according to an embodiment of the present application. As shown in fig. 6, the variable power tracking characteristic control apparatus for a wind turbine based on inertia demand according to this embodiment may include: a first calculation module 201, a second calculation module 202 and a determination module 203.
The first calculating module 201 is configured to calculate a required rotation speed variation of the fan according to an inertia demand of the power system on the fan.
The second calculating module 202 is configured to calculate a change time when a change amount of a frequency of the power system reaches a preset frequency deviation according to a frequency response when the power system is disturbed.
The determining module 203 is configured to determine a novel scaling factor of a power tracking curve of the fan according to the change time and the required rotation speed change amount, so that the fan generates additional active power according to the novel scaling factor within the change time to participate in the inertial response of the power system.
Optionally, the determining module 203 is specifically configured to: determining a rotor motion expression of the fan in the maximum power tracking area according to the active power of the fan in the maximum power tracking area; and performing integral operation on the rotor motion expression based on the change time and the required rotating speed variation to determine a novel proportional coefficient of a power tracking curve of the fan.
Optionally, the determining module 203 is further specifically configured to: determining a recovery proportionality coefficient of a power tracking curve of the fan according to the novel proportionality coefficient and a maximum power tracking control proportionality coefficient of the fan, so that the fan is smoothly switched to maximum power tracking control according to the recovery proportionality coefficient within recovery time; the recovery time is a time when the variation of the frequency of the power system reaches a preset frequency deviation and then gradually decreases to 0.
It should be noted that, for the information interaction, execution process, and other contents between the above-mentioned devices/units, the specific functions and technical effects thereof are based on the same concept as those of the embodiment of the method of the present application, and specific reference may be made to the part of the embodiment of the method, which is not described herein again.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 7, the electronic apparatus 300 of this embodiment includes: a processor 310, a memory 320, wherein the memory 320 stores a computer program 321 that can be run on the processor 310. The processor 310, when executing the computer program 321, implements the steps in any of the various method embodiments described above, such as steps 101 to 103 shown in fig. 1. Alternatively, the processor 310, when executing the computer program 321, implements the functions of each module/unit in each device embodiment described above, for example, the functions of the modules 201 to 203 shown in fig. 6.
Illustratively, the computer program 321 may be partitioned into one or more modules/units, which are stored in the memory 320 and executed by the processor 310 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 321 in the electronic device 300.
Those skilled in the art will appreciate that fig. 7 is merely an example of an electronic device and is not limiting and may include more or fewer components than shown, or combine certain components, or different components, such as input-output devices, network access devices, buses, etc.
The Processor 310 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 320 may be an internal storage unit of the electronic device, such as a hard disk or a memory of the electronic device, or an external storage device of the electronic device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the electronic device. The memory 320 may also include both an internal storage unit and an external storage device of the electronic device. The memory 320 is used for storing computer programs and other programs and data required by the electronic device. The memory 320 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. For the specific working processes of the units and modules in the system, reference may be made to the corresponding processes in the foregoing method embodiments, which are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. 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/electronic device and method may be implemented in other ways. For example, the above-described apparatus/electronic device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
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 can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
The above-mentioned embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A variable power tracking characteristic control method of a fan based on inertia requirements is characterized by comprising the following steps:
calculating the required rotating speed variation of the fan according to the inertia requirement of the power system on the fan;
calculating the change time when the variable quantity of the frequency of the power system reaches the preset frequency deviation according to the frequency response when the power system is disturbed;
and determining a novel proportionality coefficient of a power tracking curve of the fan according to the change time and the required rotating speed variation, so that the fan generates extra active power according to the novel proportionality coefficient in the change time to participate in the inertial response of the power system.
2. The variable power tracking characteristic control method of the fan based on the inertia demand as claimed in claim 1, wherein the determining of the novel proportionality coefficient of the power tracking curve of the fan according to the change time and the demanded rotation speed variation includes:
determining a rotor motion expression of the fan in the maximum power tracking area according to the active power of the fan in the maximum power tracking area;
and performing integral operation on the rotor motion expression based on the change time and the required rotating speed variation, and determining a novel proportional coefficient of a power tracking curve of the fan.
3. The variable power tracking characteristic control method of the fan based on the inertia demand as recited in claim 2, wherein the rotor motion expression is:
in the formula, k t Is a new scale factor, k opt Controlling the proportionality coefficient, omega, for maximum power tracking of a fan r Is the real-time rotating speed of the fan,
the active power of the fan under the power tracking control of the novel proportionality coefficient after the power system is disturbed,
the active power H of the fan in the maximum power tracking area before the power system is disturbed w Is the inherent inertia time constant of the fan, and t is time;
performing integral operation on the rotor motion expression:
in the formula, t f To vary time, ω r0 Is the initial speed of the fan, omega r1 ＝ω r0 +Δω r ，Δω r Is the required rotational speed variation;
the novel scaling factor is expressed as:
4. the variable power tracking characteristic control method of the wind turbine based on the inertia demand as claimed in claim 1, wherein the inertia demand of the power system to the wind turbine is a virtual inertia time constant of the wind turbine; the expression of the virtual inertia time constant of the fan is as follows:
in the formula, H v Is the virtual inertia time constant, Δ ω, of the fan r For the required speed variation, ω e For synchronous speed of the grid, Δ ω e For synchronous speed variation of the power system, ω r0 Is the initial speed of the fan, H w Is the inherent inertia time constant of the fan;
determining the required rotating speed variation as follows according to the expression of the virtual inertia time constant of the fan:
5. the method of controlling variable power tracking characteristics of a wind turbine based on inertia demand of claim 1, wherein the frequency response is expressed as:
in the formula, H g Is inertia time constant of the power system, Δ f (t) is preset frequency deviation, t is time, Δ P L For the amount of disturbance of the load, D s Is a damping coefficient; delta P m The mechanical power variation of the synchronous generator can be expressed as:
in the formula, K s For the primary frequency-modulation coefficient, T, of the synchronous generator G Delaying the primary frequency modulation of the synchronous generator;
and determining the change time according to the preset frequency deviation based on the frequency response and the mechanical power change amount of the synchronous generator.
6. The method of any of claims 1 to 5, further comprising: determining a recovery proportionality coefficient of a power tracking curve of the fan according to the novel proportionality coefficient and a maximum power tracking control proportionality coefficient of the fan, so that the fan is smoothly switched to maximum power tracking control according to the recovery proportionality coefficient within recovery time; the recovery time is a time when the variation of the frequency of the power system reaches a preset frequency deviation and then is gradually reduced to 0.
7. The method of controlling variable power tracking characteristics of a wind turbine based on inertia requirements of claim 6, wherein the recovery scaling factor is expressed as:
in the formula, k tt To recover the scale factor, k t Is a new scale factor, k opt Controlling a proportional coefficient for maximum power tracking of the fan, wherein delta f (t) is a preset frequency deviation, and delta f max The maximum value of the frequency deviation of the power system.
8. The utility model provides a fan variable power tracking characteristic controlling means based on inertia demand which characterized in that includes:
the first calculation module is used for calculating the required rotating speed variation of the fan according to the inertia requirement of the power system on the fan;
the second calculation module is used for calculating the change time when the change quantity of the frequency of the power system reaches the preset frequency deviation according to the frequency response when the power system is disturbed;
and the determining module is used for determining a novel proportionality coefficient of a power tracking curve of the fan according to the change time and the required rotating speed variation, so that the fan generates additional active power according to the novel proportionality coefficient in the change time to participate in the inertial response of the power system.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor, when executing the computer program, implements the method of controlling a variable power tracking characteristic of a wind turbine based on inertia demand according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the method of controlling a variable power tracking characteristic of a wind turbine based on inertia demand according to any one of claims 1 to 7.
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| CN117108444A (en) * | 2023-06-21 | 2023-11-24 | 国网甘肃省电力公司经济技术研究院 | Control method and system for additional inertia of doubly-fed fan based on inertia demand |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117108444A (en) * | 2023-06-21 | 2023-11-24 | 国网甘肃省电力公司经济技术研究院 | Control method and system for additional inertia of doubly-fed fan based on inertia demand |
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