CN115149579A - Fan virtual inertia control method and system based on system inertia requirements - Google Patents

Fan virtual inertia control method and system based on system inertia requirements Download PDF

Info

Publication number
CN115149579A
CN115149579A CN202211012768.1A CN202211012768A CN115149579A CN 115149579 A CN115149579 A CN 115149579A CN 202211012768 A CN202211012768 A CN 202211012768A CN 115149579 A CN115149579 A CN 115149579A
Authority
CN
China
Prior art keywords
inertia
fan
virtual inertia
virtual
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211012768.1A
Other languages
Chinese (zh)
Inventor
张祥宇
金召展
付媛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China Electric Power University
Original Assignee
North China Electric Power University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North China Electric Power University filed Critical North China Electric Power University
Priority to CN202211012768.1A priority Critical patent/CN115149579A/en
Publication of CN115149579A publication Critical patent/CN115149579A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The invention provides a method and a system for controlling virtual inertia of a fan based on system inertia requirements, wherein the method comprises the following steps: the method comprises the steps of firstly evaluating the virtual inertia requirements of a system on a fan under different wind power permeabilities and power disturbances according to the frequency change rate constraint of the system, then determining the virtual inertia action time of the fan according to a grid-connected standard, then providing a fan virtual inertia control strategy based on the inertia requirements of the system through rotating speed tracking control according to a fan power response principle, and setting controller parameters according to the virtual inertia requirements to enable the inertia shown by the fan to meet the requirements. The method can quantitatively control the virtual inertia of the fan according to the virtual inertia demand of the system on the fan, so that the virtual inertia presented by the fan always meets the demand of the system.

Description

Fan virtual inertia control method and system based on system inertia requirements
Technical Field
The invention relates to the technical field of evaluation and control of virtual inertia requirements of a new energy high-permeability power system, in particular to a method and a system for controlling virtual inertia of a fan based on system inertia requirements.
Background
With the large-scale access of new energy power generation equipment to a power system, the inertia level of the system is continuously reduced, the frequency safety problem of the system after power disturbance is seriously influenced, the wind turbine generator serves as large-scale rotating equipment, the rotating speed of the wind turbine generator is changed through additional control, the wind turbine generator can have inertial response capacity similar to that of a synchronous machine, the inertia required by the inertial response of a fan cannot be known in advance, the rotating speed of the fan is greatly changed in a short time in the actual control process, and the problems of power overshoot, mechanical load increase, difficulty in rotating speed recovery and the like are caused, so that the fan needs to perform inertial response on the premise of considering the inertia requirement of the system. Therefore, how to evaluate the virtual inertia demand of the system on the fan and make the inertia magnitude represented by the inertia response of the fan meet the inertia demand of the system through additional control becomes an urgent problem to be solved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method and a system for controlling virtual inertia of a fan based on system inertia requirements, which can evaluate the virtual inertia requirements of the system on the fan under different wind power permeabilities and power disturbances according to system frequency change rate constraints, and can complete quantitative control of the virtual inertia of the fan by utilizing fan rotating speed tracking performance, so that the virtual inertia presented by the fan meets the requirements.
In order to achieve the technical purpose, the application provides a method for controlling virtual inertia of a fan based on system inertia requirements, which comprises the following steps:
acquiring the virtual inertia demand of the wind power high permeability system on the fan according to the system frequency change rate constraint of the fan, wherein the system frequency change rate constraint is used for representing the constraint condition of the frequency change rate of the wind power high permeability system;
acquiring virtual inertia action time of a fan according to a wind power grid-connected standard, wherein power generation equipment of a wind power grid-connected system consists of a synchronous machine and the fan, and the virtual inertia action time is used for expressing the time of finishing inertia response of the fan in the process of falling or lifting the frequency to a frequency deviation extreme value;
and generating a fan virtual inertia control strategy of the fan according to the fan power response principle and the virtual inertia action time based on the virtual inertia requirement.
Preferably, in the process of acquiring the virtual inertia demand, a first expression for representing a system frequency change rate constraint is generated by acquiring a system maximum frequency change rate based on a system minimum inertia demand;
acquiring a second expression which is used for expressing an inertia time constant of the wind power high ratio system when the virtual inertia is provided by the fan;
and combining the first expression and the second expression to generate a third expression for representing the virtual inertia requirement.
Preferably, in the process of generating the first expression, the second expression and the third expression, the first expression is:
Figure BDA0003811236420000021
in the formula,. DELTA.P d Is a power disturbance; h sys Is the system inertia time constant, H min In order to minimize the inertia requirement of the system,
Figure BDA0003811236420000031
representing the rate of change of the system frequency;
the second expression is:
Figure BDA0003811236420000032
in the formula, H g Is the inertia time constant of the synchronous machine; s g Is the rated capacity of the synchronous generator; s B Is the rated capacity of the system; k is wind power permeability; h vir The time constant is a virtual inertia time constant of the wind turbine generator;
the third expression is:
Figure BDA0003811236420000033
preferably, in the process of obtaining the virtual inertia action time of the wind turbine, a frequency response equation of the wind power grid-connected system after power disturbance is constructed is as follows:
Figure BDA0003811236420000034
wherein H sys Δ f (t) is a frequency deviation signal, Δ P, for the system inertia time constant d For power disturbance, D sys For load regulation factor, Δ P m For synchronous machine power response signals, Δ P w Responding to the signal for the fan power;
and acquiring virtual inertia acting time according to a frequency response equation.
Preferably, in the process of constructing the frequency response equation, the system inertia time constant H sys Depending on the capacity duty of the synchronous machine, it is expressed as:
H sys ＝H g (1-k)。
preferably, the synchronizer power response signal Δ P is used in the construction of the frequency response equation m Equivalent to a first order inertial signal, expressed as:
Figure BDA0003811236420000041
wherein, T g Delay time of primary frequency modulation for synchronous machine, K sys Is a primary frequency modulation coefficient, delta f is a frequency deviation signal, and s is a complex variable;
the primary chirp coefficient is expressed as:
K sys ＝K g (1-k)
wherein, K g Is the primary frequency modulation coefficient of the synchronous machine.
Preferably, in the process of constructing the frequency response equation, the expression of the frequency deviation signal Δ f (t) is:
Figure BDA0003811236420000042
wherein the content of the first and second substances,
Figure BDA0003811236420000043
deriving Δ f (t) to obtain virtual inertia action time t vir Expressed as:
Figure BDA0003811236420000044
preferably, in the process of generating the virtual inertia control strategy of the fan, the rotating speed requirement of the fan is obtained according to the virtual inertia requirement, wherein the rotating speed requirement is used for representing the rotating speed variation meeting the virtual inertia requirement of the fan;
based on the rotating speed requirement, a first-order inertia link is introduced to generate a virtual inertia control strategy of the fan.
Preferably, in the process of acquiring the rotating speed requirement, a tracking control model for the rotating speed of the fan is constructed to acquire the rotating speed requirement;
the expression of the tracking control model is:
Figure BDA0003811236420000051
wherein, ω is r0 Setting the initial rotation speed of the fan; Δ ω r Required amount of change in rotational speed, H, for the fan to meet inertia requirements vir Represents the real-time equivalent inertia time constant delta f in the inertia response process of the fan max Is t vir And (4) frequency deviation value corresponding to time.
The invention discloses a virtual inertia control system of a fan based on system inertia requirements, which comprises:
the virtual inertia demand generation module is used for acquiring the virtual inertia demand of the wind power high permeability system on the fan according to the system frequency change rate constraint, wherein the system frequency change rate constraint is used for representing the constraint condition of the frequency change rate of the wind power high permeability system;
the virtual inertia action time generation module is used for acquiring the virtual inertia action time of the fan according to the wind power grid-connected standard, wherein the power generation equipment of the wind power grid-connected system consists of a synchronous machine and the fan, and the virtual inertia action time is used for expressing the time of finishing inertia response of the fan in the process of falling or lifting the frequency to a frequency deviation extreme value;
and the control strategy generation module is used for generating a virtual inertia control strategy of the fan according to the virtual inertia action time and the fan power response principle based on the virtual inertia requirement.
The invention discloses the following technical effects:
according to the method, the virtual inertia of the fan is quantitatively controlled according to the virtual inertia demand of the system on the fan, so that the virtual inertia of the fan always meets the system demand.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling virtual inertia of a wind turbine based on system inertia requirements according to an embodiment of the present invention;
FIG. 2 shows a result of evaluating a virtual inertia requirement of a wind turbine according to an embodiment of the present invention;
FIG. 3 is a block diagram of a control of virtual inertia of a wind turbine according to an embodiment of the present invention;
FIG. 4 is a simulation topological graph of a wind power high-occupancy ratio system according to an embodiment of the present invention;
FIG. 5 is a dynamic response curve of the system during a sudden load increase according to an embodiment of the present invention;
FIG. 6 is a dynamic response curve of the system during a sudden load drop according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1 to 6, the present invention provides a method and a system for controlling virtual inertia of a wind turbine based on system inertia requirements, wherein the above objects, features and advantages of the present invention can be more clearly understood through calculation, and the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
Fig. 1 is a flowchart of a method for controlling virtual inertia of a wind turbine based on system inertia requirements according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
step 1: evaluating the virtual inertia demand of the wind power high permeability system on the fan according to the frequency change rate constraint;
step 2: analyzing and calculating the inertia response action time of the fan according to the wind power integration standard;
and step 3: according to a fan power response principle, a fan virtual inertia control strategy based on system inertia requirements is provided.
The inertia of the wind power high-occupancy system is remarkably reduced, and the virtual inertia of the fan is set according to the safety requirement of the system frequency. At present, foreign researches have proposed relevant standards for micro grid island operation, and the system frequency change rate (df/dt) is required to be not higher than +/-0.5 Hz/s. The maximum frequency change rate of the system appears at the initial stage of power disturbance, the primary frequency modulation is not operated, the unbalanced power of the rotor side of the synchronous machine is maximum, and the system frequency change rate can be expressed as
Figure BDA0003811236420000071
In the formula,. DELTA.P d Is the magnitude of the power disturbance; h sys Is the system inertia time constant.
According to the above equation, when the frequency rate of change constraint is determined, the system inertia requirement may be expressed as
Figure BDA0003811236420000081
In the formula, H min The minimum inertia requirement of the system.
When the wind turbine provides virtual inertia, the inertia time constant of the wind power high-occupancy ratio system can be expressed as
Figure BDA0003811236420000082
In the formula, H g Is the inertia time constant of the synchronous machine; s g Is the rated capacity of the synchronous generator; s B Is the rated capacity of the system; k is the wind power permeability; h vir And the time constant is the virtual inertia time constant of the wind turbine generator.
The virtual inertia demand of the wind turbine when the system is disturbed by power can be expressed by the two modes in a simultaneous way
Figure BDA0003811236420000083
Will synchronize the inertia time constant H of the machine g Frequency rate of change constraint (df/dt) max The virtual inertia requirements of the wind turbine under different power disturbances and wind-electricity permeabilities can be obtained by substituting the above formula.
Fig. 2 is a result of evaluating a virtual inertia requirement of a fan according to an embodiment of the present invention. As can be seen from FIG. 2, when the disturbance power is small and the wind power permeability is low, only the inertia H of the synchronous machine g The requirement of system inertia can be met. If the permeability is lower than 20%, the inertia of the synchronous machine can deal with disturbance of more than 8%. However, as wind permeability increases, the ability of the system to cope with power disturbances is gradually diminished, and when wind permeability reaches 50%, the system can cope with disturbances below 5%, which is insufficient to cope with typical failures. At this time, the process of the present invention,the wind turbine generator set provides necessary inertial support according to system requirements. The inertia requirement of the system is increased along with the increase of power disturbance, and the virtual inertia requirement of the fan can be calculated according to the wind power permeability under the same power disturbance. Such as Δ P d When =0.15pu, the system inertia requirement is 7.5s. When k =20%, the fan needs to provide 17.5s of virtual inertia to achieve 7.5s of total system inertia, and when k =50%, the fan needs to provide 10s of virtual inertia to achieve 7.5s of total system inertia.
Determining and calculating the virtual inertia action time of the fan according to the wind power integration standard, which specifically comprises the following steps: according to GB/T19963.1-2021 technical Specification for accessing a wind power plant to a power system, a fan needs to have an inertia support function after being accessed to the system, but an additional controller needs to be started to meet the following conditions: Δ f × df/dt > 0. Obviously, the fan should complete inertia response within the time when the frequency falls or rises to the extreme value of the frequency deviation, and the time is taken as the virtual inertia action time of the fan and is used as t vir And (4) showing. Assuming that a power generation device of a wind power grid-connected system consists of a synchronous machine and a fan, and the wind power permeability is k, a frequency response equation of the system after power disturbance can be expressed as follows:
Figure BDA0003811236420000091
in the formula, H sys Δ f (t) is a frequency deviation signal, Δ P, for the system inertia time constant d For power disturbance, D sys For the load regulation factor, 1, Δ P is generally taken m For the synchronous machine power response signal, Δ p w Is a fan power response signal, wherein H sys Depending on the capacity fraction of the synchronous machine, it can be expressed as:
H sys ＝H g (1-k) (6)
in the formula, H g Is the inertia time constant of the synchronous machine; and k is the wind power permeability.
Power response of synchronous machine Δ P m Can be equivalent to a first-order inertia signal, and can be specifically expressed as:
Figure BDA0003811236420000092
in the formula, T g The delay time of primary frequency modulation of a synchronous machine is generally 1s; k sys Is the primary coefficient, which can be expressed as:
K sys ＝K g (1-k) (8)
in the formula, K g Primary frequency modulation coefficient of the synchronous machine; and k is the wind power permeability.
Will be delta P m Substituting the expression into the system frequency response equation and solving the available frequency deviation signal Δ f (t) after the system is subjected to power disturbance can be expressed as:
Figure BDA0003811236420000101
in the formula, a, b, c, d are calculation parameters, which can be respectively expressed as:
Figure BDA0003811236420000102
the derivative of delta f (t) is obtained, and the time when the derivative is 0 is the time t for the frequency to fall or rise from the initial value to the extreme value of the frequency deviation vir It can be expressed as:
Figure BDA0003811236420000103
taking typical parameters of the synchronous generator: h g ＝5s，K g =25MW/Hz, the corresponding tvir values obtained by calculation when the wind power permeability k is respectively 0%, 20% and 40% are respectively 2.3s, 2.298s and 2.305s, so t can be taken vir The 2.3s is taken as typical data of the acting time of the virtual inertia of the fan, and the fan should complete the virtual inertia support in the time.
Combining the inertia requirement of the system, the wind turbine generator can utilize the rotating speed tracking performance thereof at t vir And completing virtual inertial support. FIG. 3 is a schematic diagram of a blower according to an embodiment of the present inventionAnd simulating an inertia control block diagram. The virtual inertia controller structure of the fan consists of a virtual inertia control module and a virtual inertia evaluation module.
In the virtual inertia evaluation module of the fan, according to the formula (4), the inertia demand of the fan can be calculated by introducing disturbance power and wind-electricity permeability, and according to the evaluation result of the inertia demand of the fan, the rotating speed demand of the fan can be calculated, and the specific analysis is as follows:
real-time equivalent inertia time constant H in fan inertia response process vir Can be expressed as
Figure BDA0003811236420000111
In the formula,. DELTA.P w And (t) the real-time inertial support power of the fan. In the time of frequency conversion extreme value, the two sides of the upper type are integrated simultaneously
Figure BDA0003811236420000112
In the formula,. DELTA.f max Is t vir The frequency deviation value corresponding to the time can be calculated according to equation (9) under the assumption that the system inertia meets the requirement. In the inertial response process of the fan, the motion equation of the rotor of the wind turbine generator can be expressed as
Figure BDA0003811236420000113
In the formula, H w Is the inherent inertia time constant of the fan; p we The electromagnetic power output by the fan; p wm Mechanical power captured by the fan. The two formulas are combined and solved, and the rotating speed variation quantity meeting the virtual inertia requirement of the fan can be expressed as
Figure BDA0003811236420000114
In the formula, ω r0 The initial rotating speed of the fan is set; delta ofω r The required rotational speed variation when meeting inertia demand for the fan. According to the formula, the required rotating speed variation delta omega of the fan under different initial rotating speeds can be obtained by bringing the operating state parameters and the inertia requirements of the fan into r . Then t vir Corresponding rotation speed omega of fan at any moment r1 ＝Δω r +ω r0 。
The virtual inertia control module of the fan generates an additional power signal through rotating speed tracking control to enable the real-time rotating speed of the fan to track the reference rotating speed, wherein the reference rotating speed is omega r_ref According to omega r1 And (4) setting. Firstly, to ensure that the rotating speed of the fan can be t vir Inner by omega r0 Change to omega r1 The principle of designing the tracking control of the rotating speed based on the equation of motion of the fan rotor is as follows
Figure BDA0003811236420000121
In the formula, K p The controller parameters are tracked for rotational speed. From the above equation, it can be calculated at t vir Inner K p Take a value of
Figure BDA0003811236420000122
In the formula, ω r_ref Is a reference rotation speed; omega r_ref ＝ω r1 ±Δω r1 ；Δω r1 Is the rotational speed variation margin. Calculating Kp value according to the formula to realize that the rotating speed of the fan is t vir Internal channel of omega r0 Change to omega r1 Thereby realizing the quantitative control of the rotating speed of the fan.
Secondly, ensuring the inertial support power of the fan at t vir And smoothly exiting after the moment, and introducing a first-order inertia link. When the rotating speed of the fan is t 0 +t vir Change in time to ω r1 And then, the rotating speed tracking control is quitted through a first-order inertia link. Under the control, the inertial support power signal of the fan can be expressed as
Figure BDA0003811236420000123
In the formula, t 0 The time when the power disturbance occurs to the system; and T is a first-order inertia link time parameter and is taken as 5s.
Under the control of the above formula, the power of the inertial support of the fan is maximum at the initial disturbance moment, so that the frequency change rate can be effectively inhibited; after the frequency reaches an extreme point, the rotating speed is changed to the demand evaluation value omega r1 And the smooth exit of the inertia support power is realized under the action of a first-order inertia link.
Example 1: FIG. 4 is a simulation topological diagram of a wind power high-occupancy system according to an embodiment of the present invention; in the embodiment, the IEEE3 machine 9 node wind Power high-ratio simulation system shown in FIG. 4 is built on the basis of DIGSILENT/Power Factory simulation platform. The test system comprises three thermal power plants (G) 1 、G 2 、G 3 ) And a wind power plant (DFIG) which can change the wind power permeability by adjusting the capacity of the thermal power generating unit and the fan. Assuming that the wind speed remains constant at 8m/s, the main system parameters are shown in Table 1. Setting the system at t 0 Load sudden change occurred when =2.0 s.
TABLE 1 System parameters
Figure BDA0003811236420000131
In order to verify the effectiveness of the fan virtual inertia control strategy based on the system inertia requirement, simulation example parameters are set as shown in table 2:
TABLE 2 example parameter settings
Figure BDA0003811236420000132
Under the calculation example, the wind power permeability k =20%, and the power disturbance delta P d =0.12pu, according to equation (4), the virtual inertia requirement of the fan is 10s. The traditional differential control and the virtual inertia control of the fan based on the inertia requirement of the system are respectively added to the fan, and the dynamic response curve of the system after power disturbance is obtained as shown in fig. 5 and 6。
FIG. 5 is a dynamic response curve of the system during a sudden load increase according to an embodiment of the present invention; at Δ P d When the frequency is more than 0 and no additional control is carried out, the fan hardly responds to the frequency change, and the maximum frequency drop amplitude delta f of the system max Is-0.61 Hz, maximum rate of frequency change (df/dt) max Is-0.67 Hz/s, and exceeds the frequency safety allowable value.
As shown in fig. 5 (a 1) - (a 3), when the differential control is adopted, the fan is in the frequency conversion extreme value time t vir The inner speed change amount is 0.025pu, the maximum frequency change rate (df/dt) of the system max And the fall amplitude Δ f max Respectively to-0.54 Hz/s and-0.58 Hz, but still not meet the maximum frequency rate constraint. Blower fan at t vir Inner H vir 8.79s, the fan inertia requirement under the calculation example is not met. In addition, the differential control cannot be performed at t vir And exiting at any moment, so that overshoot appears in the frequency recovery process, and the frequency is not safe and stable.
When the control strategy provided by the invention is adopted, the variation of the rotating speed of the fan is 0.028pu, and the system frequency variation rate (df/dt) max And the fall amplitude Δ f max Respectively reduced to-0.49 Hz/s and-0.52 Hz, and the fan is at t vir Inner H vir The time is 10.98s, and the requirement of the system on virtual inertia is met. According to the graphs (b 1) to (b 3) of fig. 5, smooth exit of the inertial support power of the fan can be realized in the rotating speed tracking control, and the overshoot in the system frequency recovery process is reduced; under the action of a first-order inertia link, the inertia support power of the fan is reduced to 0 after time delay, the time when the rotating speed starts to recover is later, the fan is prevented from absorbing power in the frequency recovery stage, the frequency recovery of the system is facilitated, and the frequency modulation effect is superior to that of the traditional differential control.
FIG. 6 is a dynamic response curve of the system during a sudden load drop according to an embodiment of the present invention; when Δ P d When the frequency is less than 0, the fan rotating speed variation under the differential control is 0.026pu, and the system frequency variation rate (df/dt) max And the fall amplitude Δ f max Respectively reduced to 0.54Hz/s and 0.58Hz, and the fan is at t vir Inner H vir 9.14s, the requirement of the fan inertia under the calculation example is not met; the control strategy provided by the invention is adoptedSlightly below, the variation of the fan speed is 0.029pu, the system frequency variation rate (df/dt) max And the fall amplitude Δ f max Respectively reduced to 0.48Hz/s and 0.52Hz, and the fan is at t vir Inner H vir The time is 11.37s, and the requirement of the system on virtual inertia is met.
Compared with the traditional method, the virtual inertia demand of the system on the fan under different wind power permeabilities and power disturbances is evaluated according to the frequency change rate constraint of the system, the virtual inertia acting time of the fan is determined according to the grid-connected standard, then a fan virtual inertia control strategy based on the system inertia demand is provided through rotating speed tracking control according to the fan power response principle, and the inertia presented by the fan can meet the demand according to the virtual inertia demand setting controller parameters. The method can quantitatively control the virtual inertia of the fan according to the virtual inertia demand of the system on the fan, so that the virtual inertia presented by the fan always meets the demand of the system.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
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, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A method for controlling virtual inertia of a fan based on system inertia requirements is characterized by comprising the following steps:
acquiring the virtual inertia demand of the wind power high permeability system on the fan according to the system frequency change rate constraint, wherein the system frequency change rate constraint is used for representing the constraint condition of the wind power high permeability system frequency change rate;
acquiring virtual inertia action time of a fan according to a wind power grid-connected standard, wherein power generation equipment of a wind power grid-connected system consists of a synchronous machine and the fan, and the virtual inertia action time is used for expressing the time of finishing inertia response of the fan in the process of falling or lifting the frequency to a frequency deviation extreme value;
and generating a virtual inertia control strategy of the fan according to the virtual inertia action time and the fan power response principle based on the virtual inertia requirement.
2. The method for controlling the virtual inertia of the fan based on the inertia demand of the system as claimed in claim 1, wherein:
in the process of obtaining the virtual inertia requirement, based on the minimum inertia requirement of the system, generating a first expression for representing the frequency change rate constraint of the system by obtaining the maximum frequency change rate of the system;
acquiring a second expression of the wind power high-ratio system for representing an inertia time constant when the wind turbine provides virtual inertia;
and combining the first expression and the second expression to generate a third expression for representing the virtual inertia requirement.
3. The method for controlling the virtual inertia of the fan based on the system inertia demand as claimed in claim 2, wherein:
in the process of generating a first expression, a second expression and a third expression, the first expression is as follows:
Figure FDA0003811236410000021
in the formula,. DELTA.P d Is a power disturbance; h sys Is the system inertia time constant, H min In order to minimize the inertia requirement of the system,
Figure FDA0003811236410000022
representing the rate of change of the system frequency;
the second expression is:
Figure FDA0003811236410000023
in the formula, H g Is the inertia time constant of the synchronous machine; s g Is the rated capacity of the synchronous generator; s B Is the rated capacity of the system; k is wind power permeability; h vir The time constant is a virtual inertia time constant of the wind turbine generator;
the third expression is:
Figure FDA0003811236410000024
4. the method for controlling the virtual inertia of the fan based on the system inertia requirement as claimed in claim 3, wherein:
in the process of obtaining the virtual inertia action time of the fan, a frequency response equation of the wind power grid-connected system after power disturbance is constructed as follows:
Figure FDA0003811236410000025
wherein H sys Δ f (t) is a frequency deviation signal, Δ P, for the system inertia time constant d For power disturbance, D sys For the load regulation factor, Δ P m For the synchronizer power response signal, Δ P w Responding to the signal for the fan power;
and acquiring the virtual inertia acting time according to the frequency response equation.
5. The method for controlling the virtual inertia of the fan based on the system inertia requirement as claimed in claim 4, wherein:
in the process of constructing the frequency response equation, the system inertia time constant H sys Depending on the capacity ratio of the synchronous machine, expressed as:
H sys ＝H g (1-k)。
6. the method for controlling the virtual inertia of the fan based on the system inertia requirement as claimed in claim 5, wherein:
in the process of constructing a frequency response equation, the synchronizer power response signal delta P m Equivalent to a first order inertial signal, expressed as:
Figure FDA0003811236410000031
wherein, T g Delay time of primary frequency modulation for synchronous machine, K sys Is a primary frequency modulation coefficient, delta f is a frequency deviation signal, and s is a complex variable;
the primary coefficient is expressed as:
K sys ＝K g (1-k)
wherein, K g Is the primary frequency modulation coefficient of the synchronous machine.
7. The method for controlling the virtual inertia of the wind turbine based on the system inertia demand as claimed in claim 6, wherein:
in constructing the frequency response equation, the frequency deviation signal Δ f (t) is expressed as:
Figure FDA0003811236410000032
wherein the content of the first and second substances,
Figure FDA0003811236410000041
deriving Δ f (t) to obtain the virtual inertia action time t vir Expressed as:
Figure FDA0003811236410000042
8. the method for controlling the virtual inertia of the wind turbine based on the inertia demand of the system as claimed in claim 7, wherein:
in the process of generating the virtual inertia control strategy of the fan, acquiring a rotating speed requirement of the fan according to a virtual inertia requirement, wherein the rotating speed requirement is used for representing a rotating speed variation meeting the virtual inertia requirement of the fan;
and generating the virtual inertia control strategy of the fan by introducing a first-order inertia link based on the rotating speed requirement.
9. The virtual inertia control method of the wind turbine based on the system inertia requirement as claimed in claim 8, wherein:
in the process of acquiring the rotating speed requirement, constructing a tracking control model for the rotating speed of the fan, and acquiring the rotating speed requirement;
the expression of the tracking control model is as follows:
Figure FDA0003811236410000043
wherein, ω is r0 Setting the initial rotation speed of the fan; Δ ω r Required rotational speed variation, H, for the fan to meet inertia requirements vir Represents the real-time equivalent inertia time constant, delta f, in the inertial response process of the fan max Is t vir And (4) frequency deviation value corresponding to time.
10. The utility model provides a virtual inertia control system of fan based on system inertia demand which characterized in that includes:
the virtual inertia demand generation module is used for acquiring the virtual inertia demand of the wind power high permeability system on the fan according to the system frequency change rate constraint, wherein the system frequency change rate constraint is used for representing the constraint condition of the wind power high permeability system frequency change rate;
the system comprises a virtual inertia action time generation module, a frequency deviation limiting module and a frequency deviation limiting module, wherein the virtual inertia action time generation module is used for acquiring the virtual inertia action time of a fan according to a wind power grid-connected standard, a power generation device of a wind power grid-connected system consists of a synchronous machine and the fan, and the virtual inertia action time is used for expressing the time of finishing inertia response of the fan in the process of falling or rising the frequency to a frequency deviation extreme value;
and the control strategy generation module is used for generating the virtual inertia control strategy of the fan according to the virtual inertia action time and the fan power response principle based on the virtual inertia requirement.
CN202211012768.1A 2022-08-23 2022-08-23 Fan virtual inertia control method and system based on system inertia requirements Pending CN115149579A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211012768.1A CN115149579A (en) 2022-08-23 2022-08-23 Fan virtual inertia control method and system based on system inertia requirements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211012768.1A CN115149579A (en) 2022-08-23 2022-08-23 Fan virtual inertia control method and system based on system inertia requirements

Publications (1)

Publication Number Publication Date
CN115149579A true CN115149579A (en) 2022-10-04

Family

ID=83415760

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211012768.1A Pending CN115149579A (en) 2022-08-23 2022-08-23 Fan virtual inertia control method and system based on system inertia requirements

Country Status (1)

Country Link
CN (1) CN115149579A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116667463A (en) * 2023-07-28 2023-08-29 昆明理工大学 New energy grid-connected power system inertia demand estimation method
CN116706944A (en) * 2023-08-07 2023-09-05 昆明理工大学 Method for determining new energy permeability under frequency safety constraint
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN116667463A (en) * 2023-07-28 2023-08-29 昆明理工大学 New energy grid-connected power system inertia demand estimation method
CN116667463B (en) * 2023-07-28 2023-10-03 昆明理工大学 New energy grid-connected power system inertia demand estimation method
CN116706944A (en) * 2023-08-07 2023-09-05 昆明理工大学 Method for determining new energy permeability under frequency safety constraint
CN116706944B (en) * 2023-08-07 2023-10-27 昆明理工大学 Method for determining new energy permeability under frequency safety constraint

Similar Documents

Publication Publication Date Title
CN115149579A (en) Fan virtual inertia control method and system based on system inertia requirements
CN109494769B (en) Wind field participating frequency modulation method and system
CN106286128B (en) A kind of system frequency control method and device of off-load variable-speed wind-power unit
CN111864769B (en) Frequency modulation parameter determination method and system considering frequency response characteristics of fan and system
Xu et al. Coordination of wind turbines and synchronous generators for system frequency control
CN109560573A (en) A kind of optimization method and device of variable-speed wind-power unit frequency controller parameter
CN110890765B (en) Dynamic rotating speed protection method and system for virtual inertia frequency modulation of doubly-fed wind turbine
CN110323789B (en) Wind turbine generator power control method and system based on virtual inertia simulation
CN110829487A (en) Dynamic frequency prediction method for power system
Jonkman et al. New developments for the NWTC's fast aeroelastic HAWT simulator
CN115085268A (en) Virtual-like synchronous generator inertia control system for direct-drive wind turbine generator
CN115833111A (en) Minimum inertia demand evaluation method, device, system and medium for high-proportion new energy power system
Spruce et al. Tower vibration control of active stall wind turbines
CN111336063B (en) Active power output fluctuation stabilizing method based on operation condition of wind driven generator
CN111817357A (en) AGC system control method and AGC system for frequency division control
CN106356903B (en) A kind of method and device based on Wind turbines and synchronous generator control frequency
CN113507137B (en) Wind power plant model construction method based on DigSILENT/PF and related device
CN116154804A (en) Fan-water turbine primary frequency modulation control method considering standby flexibility
CN115207941A (en) Method for evaluating inertia level of power system
CN114421490A (en) Method for constructing rapid simulation model for wind power participating in power grid frequency support
CN114069653A (en) Wind turbine generator set improved frequency modulation control method and system considering energy storage output mode
CN111786395A (en) Output adjusting method and device for wind turbine generator
CN113094936A (en) Improved direct-drive wind power plant singular perturbation order reduction method suitable for subsynchronous oscillation analysis
CN117108444A (en) Control method and system for additional inertia of doubly-fed fan based on inertia demand
CN117856358B (en) Wind turbine generator frequency adjustment and inertia control method and system based on phase-locked loop

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination