CN112290594A - Virtual inertia switching control method and system for virtual synchronous generator - Google Patents

Virtual inertia switching control method and system for virtual synchronous generator Download PDF

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Publication number
CN112290594A
CN112290594A CN202011202011.XA CN202011202011A CN112290594A CN 112290594 A CN112290594 A CN 112290594A CN 202011202011 A CN202011202011 A CN 202011202011A CN 112290594 A CN112290594 A CN 112290594A
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angular frequency
power grid
time
virtual inertia
grid
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CN112290594B (en
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贾清泉
杨晓楠
史梁
郎燕生
王珺
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Yanshan University
China Electric Power Research Institute Co Ltd CEPRI
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Yanshan University
China Electric Power Research Institute Co Ltd CEPRI
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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

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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention relates to a virtual inertia switching control method and a virtual inertia switching control system for a virtual synchronous generator, wherein the control method comprises the following steps: acquiring data of the change of the angular frequency of the power grid along with time; determining the occurrence time of the maximum offset of the angular frequency of the power grid based on the data of the angular frequency of the power grid changing along with time; determining a power grid angular frequency deviation threshold according to the power grid rated angular frequency; calculating the VSG virtual inertia moment based on the power grid angular frequency maximum offset moment and the power grid angular frequency deviation threshold; and judging whether the VSG virtual inertia needs to be quitted according to the data of the change of the angular frequency of the power grid along with the time, and if so, acquiring the quitting time of the VSG virtual inertia. The method can avoid the inhibiting effect on the frequency recovery of the power grid in the response process of the virtual synchronous generator, reduce the frequency deviation of the power grid and improve the frequency recovery speed of the power grid.

Description

Virtual inertia switching control method and system for virtual synchronous generator
Technical Field
The invention relates to the field of virtual synchronous generator control, in particular to a virtual inertia switching control method and system for a virtual synchronous generator.
Background
At present, new energy power generation is promoted to be an alternative energy position from a supplementary energy, and the new energy power generation enters a large-scale application stage. Inertia is a typical characteristic of a traditional power grid and is crucial to the frequency stability of the power grid. And the output power of wind power and photovoltaic power generation fluctuates randomly and is not controlled, and inertia power cannot be provided. In order to solve the problem of inertia loss of a new energy power system caused by the fact that the number and the capacity of new energy power generation grid connection are increased rapidly in a power grid, a virtual synchronous generator control strategy can be adopted, virtual inertia is introduced into control of a grid-connected converter, the output external characteristic of the grid-connected converter has an inertia characteristic similar to that of a traditional synchronous generator, and necessary frequency support is provided for the power grid.
In view of this, the embodiment of the present invention provides a virtual inertia switching control method for a virtual synchronous generator and a terminal device, which can avoid a suppression effect on the recovery of the power grid frequency in the response process of the virtual synchronous generator, reduce the power grid frequency deviation, and accelerate the recovery speed of the power grid frequency.
Disclosure of Invention
The invention aims to provide a virtual inertia switching control method and a virtual inertia switching control system for a virtual synchronous generator, which avoid the inhibiting effect on the frequency recovery of a power grid in the response process of the virtual synchronous generator, reduce the frequency deviation of the power grid and improve the frequency recovery speed of the power grid.
In order to achieve the purpose, the invention provides the following scheme:
a virtual inertia switching control method of a virtual synchronous generator comprises the following steps:
acquiring data of the change of the angular frequency of the power grid along with time; t is tkThe grid angular frequency measured at a time is denoted by ωk；
Determining the occurrence time of the maximum offset of the angular frequency of the power grid based on the data of the angular frequency of the power grid changing along with time;
determining a power grid angular frequency deviation threshold according to the power grid rated angular frequency;
calculating the VSG virtual inertia moment based on the power grid angular frequency maximum offset moment and the power grid angular frequency deviation threshold;
and judging whether the VSG virtual inertia needs to be quitted according to the data of the change of the angular frequency of the power grid along with the time, and if so, acquiring the quitting time of the VSG virtual inertia.
Optionally, the determining the occurrence time of the maximum offset of the grid angular frequency based on the data of the grid angular frequency changing with time specifically includes:
calculate Δ ω(k+1)＝ω(k+1)-ωk；
Calculate Δ ωk＝ωk-ω(k-1)；
Judging whether the requirements are met
Figure BDA0002755706130000021
Wherein δ is less than 10-4A constant of (d);
if the maximum deviation is met, the occurrence time t of the maximum deviation of the dynamic frequency of the power grid is indicatedmIs tkI.e. tm＝tk。
Optionally, the following formula is specifically adopted for determining the power grid angular frequency deviation threshold according to the power grid rated angular frequency:
Δωth＝(0.004～0.01)ωNwherein, ω isNFor rating the angular frequency, Δ ω, of the gridthIs the grid angular frequency deviation threshold.
Optionally, the following formula is specifically adopted for calculating the VSG virtual inertia invested time based on the power grid angular frequency maximum offset occurrence time and the power grid angular frequency deviation threshold:
Figure BDA0002755706130000022
wherein A is1、A2、α1、α2、α3And alpha4Is a constant determined by the disturbance magnitude, inertia parameters, primary and secondary regulation characteristics, and load characteristics, t0Tau is a time constant, delta omega, for investing in VSG virtual inertia momentthAs grid angular frequency deviation threshold, tmAnd the time when the maximum offset of the angular frequency of the power grid occurs.
Optionally, whether the VSG virtual inertia needs to be exited is determined according to the data of the change of the grid angular frequency with time, and if yes, obtaining the exiting time of the VSG virtual inertia specifically includes:
judging whether the requirements are met
Figure BDA0002755706130000031
If yes, the VSG virtual inertia needs to be quitted, and the quitting time of the VSG virtual inertia is tq+1Wherein, ω isqIs tqThe grid angular frequency measured at the moment.
The invention further provides a virtual inertia switching control system of a virtual synchronous generator, which comprises:
the parameter acquisition module is used for acquiring data of the change of the angular frequency of the power grid along with time; t is tkThe grid angular frequency measured at a time is denoted by ωk；
The maximum offset occurrence time calculation module is used for determining the maximum offset occurrence time of the power grid angular frequency based on the data of the power grid angular frequency changing along with time;
the power grid angular frequency deviation threshold calculation module is used for determining a power grid angular frequency deviation threshold according to the rated angular frequency of the power grid;
the input VSG virtual inertia moment calculation module is used for calculating input VSG virtual inertia moment based on the power grid angular frequency maximum offset occurrence moment and the power grid angular frequency deviation threshold;
and the judging module is used for judging whether the VSG virtual inertia needs to be quitted according to the data of the angular frequency of the power grid changing along with the time, and if so, obtaining the quitting time of the VSG virtual inertia.
Optionally, the maximum offset occurrence time calculating module includes:
calculate Δ ω(k+1)＝ω(k+1)-ωk；
Calculate Δ ωk＝ωk-ω(k-1)；
Judging whether the requirements are met
Figure BDA0002755706130000032
Wherein δ is less than 10-4A constant of (d);
if the maximum deviation is met, the occurrence time t of the maximum deviation of the dynamic frequency of the power grid is indicatedmIs tkI.e. tm＝tk。
Optionally, the grid angular frequency deviation threshold calculation module specifically adopts the following formula:
Δωth＝(0.004～0.01)ωNwherein, ω isNFor rating the angular frequency, Δ ω, of the gridthIs the grid angular frequency deviation threshold.
Optionally, the VSG virtual inertia moment input calculation module specifically adopts the following formula:
Figure BDA0002755706130000041
wherein A is1、A2、α1、α2、α3And alpha4Is a constant determined by the disturbance magnitude, inertia parameters, primary and secondary regulation characteristics, and load characteristics, t0Tau is a time constant, delta omega, for investing in VSG virtual inertia momentthAs grid angular frequency deviation threshold, tmAnd the time when the maximum offset of the angular frequency of the power grid occurs.
Optionally, the determining module includes:
judging whether the requirements are met
Figure BDA0002755706130000042
If yes, the VSG virtual inertia needs to be quitted, and the quitting time of the VSG virtual inertia is tq+1Wherein, ω isqIs tqThe grid angular frequency measured at the moment.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the virtual inertia switching control method of the virtual synchronous generator, the advantage that VSG inertia parameters are flexible and adjustable is utilized, the suppression effect on the frequency recovery of the power grid in the response process of the virtual synchronous generator can be avoided, the frequency deviation of the power grid is reduced, and the frequency recovery speed of the power grid is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used 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 inventive exercise.
Fig. 1 is a flowchart of a virtual inertia switching control method of a virtual synchronous generator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power grid according to an embodiment of the present invention;
FIG. 3 is a graph of frequency variation under different disturbances according to an embodiment of the present invention;
FIG. 4 is a graph of VSG exit control frequency variation according to an embodiment of the present invention;
FIG. 5 is a diagram of a terminal device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a virtual inertia forward/backward control system of a virtual synchronous generator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a virtual inertia switching control method and a virtual inertia switching control system for a virtual synchronous generator, which avoid the inhibiting effect on the frequency recovery of a power grid in the response process of the virtual synchronous generator, reduce the frequency deviation of the power grid and improve the frequency recovery speed of the power grid.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a virtual inertia forward/backward control method for a virtual synchronous generator according to an embodiment of the present invention, and as shown in fig. 1, the method includes:
step 101: acquiring data of the change of the angular frequency of the power grid along with time; t is tkThe grid angular frequency measured at a time is denoted by ωk。
Step 102: and determining the occurrence moment of the maximum offset of the angular frequency of the power grid based on the data of the angular frequency of the power grid changing along with time.
The method specifically comprises the following steps:
calculate Δ ω(k+1)＝ω(k+1)-ωk；
Calculate Δ ωk＝ωk-ω(k-1)；
Judging whether the requirements are met
Figure BDA0002755706130000051
Wherein δ is less than 10-4A constant of (d);
if the maximum deviation is met, the occurrence time t of the maximum deviation of the dynamic frequency of the power grid is indicatedmIs tkI.e. tm＝tk
Step 103: determining a power grid angular frequency deviation threshold value according to the power grid rated angular frequency as an input VSG virtual inertia moment t0The basis of the calculation of (2). .
The following formula is specifically adopted:
Δωth＝(0.004～0.01)ωNwherein, ω isNFor rating the angular frequency, Δ ω, of the gridthIs the grid angular frequency deviation threshold.
Step 104: and calculating the VSG virtual inertia moment based on the power grid angular frequency maximum offset moment and the power grid angular frequency deviation threshold value.
The method specifically comprises the following steps:
solving the following equation:
Figure BDA0002755706130000061
wherein A is1、A2、α1、α2、α3And alpha4Is a constant determined by the disturbance magnitude, inertia parameters, primary and secondary regulation characteristics, and load characteristics, t0Tau is a time constant, delta omega, for investing in VSG virtual inertia momentthAs grid angular frequency deviation threshold, tmAnd the time when the maximum offset of the angular frequency of the power grid occurs.
Step 105: and judging whether the VSG virtual inertia needs to be quitted according to the data of the change of the angular frequency of the power grid along with the time, and if so, acquiring the quitting time of the VSG virtual inertia.
The method specifically comprises the following steps:
judging whether the requirements are met
Figure BDA0002755706130000062
If yes, the VSG virtual inertia needs to be quitted, and the quitting time of the VSG virtual inertia is tq+1Wherein, ω isqIs tqThe grid angular frequency measured at the moment.
Example 1
The invention provides a virtual inertia input control method of a virtual synchronous generator, which comprises the following steps:
as shown in fig. 2, the power system is represented by an equivalent synchronous generator, the equivalent machine has primary and secondary frequency modulation functions, and the parameter of the equivalent machine is rated power 2 MW. The load at the VSG grid-tie bus B1 was mutated from 500kW to 800kW at 3 s. Frequency response parameter A of power grid when VSG is not put into operation1＝2.58，α1＝10.56，α25.63. VSG on-stream A2＝1.57，α3＝8.03，α4＝3.55。
The grid load suddenly increases 200kW without VSG being put into service. Setting an allowable angular frequency offset threshold value to Δ ωth2.513 rad/s. At VSGWhen the load suddenly increases 200kW in the input case, the frequency response is shown as curve L1 in fig. 3. It can be known that the angular frequency shift Δ ω is 1.948rad/s and does not exceed the angular frequency shift threshold Δ ωth. The VSG is not needed to participate under the condition of small disturbance, and the dynamic frequency offset is not out of limit. When the load suddenly increases 350kW, the frequency response is as shown by curve L in FIG. 32As shown. It can be known that the angular frequency shift Δ ω is 2.639rad/s, and the angular frequency shift threshold Δ ω has been exceededthVSG is required to participate in the regulation. Solving the formula (2) to obtain t032 s. Then at t0The VSG is switched on at the moment, and the frequency response is shown as a curve L in FIG. 33As shown. Can be seen at t0The VSG is thrown at 32s just enough that the frequency offset does not exceed the threshold. When the load suddenly increases by 500kW, the frequency response is as shown by curve L in FIG. 34As shown. It can be known that the angular frequency shift Δ ω is 3.204rad/s, and the angular frequency shift threshold Δ ω has been exceededth. Solving the formula (2) to obtain t0-5s, indicating that the VSG should be thrown immediately at the moment of the disturbance. The grid frequency response with the participation of the VSG is shown as curve L in FIG. 35As shown.
Example 2
The invention provides a virtual inertia quitting criterion of a virtual synchronous generator, which comprises the following steps:
as shown in fig. 4, curve 1, the frequency response curve of the grid under load disturbance when the VSG participates in the grid frequency modulation. T in the frequency response curveqOmega at 32sq49.73rad/s, maximum dynamic frequency offset, tq-1And tq+1Take 31.5s and 32.5s respectively, at this time
Figure BDA0002755706130000071
Substituting the formula (3) to meet the exit criterion, exiting the VSG at the moment, and the response curve of the power grid is shown as a curve 2 in FIG. 4. It can be seen that the frequency recovery speed of curve 2 is faster than that of curve 1, indicating that exiting the VSG in time during the frequency recovery phase is advantageous for frequency recovery; the VSG virtual inertia exiting criterion provided by the invention is also shown to be effective.
It can be seen from the foregoing embodiments that, in the virtual inertia switching control method for the virtual synchronous generator according to the embodiments of the present invention, the VSG inertia parameter is utilizedThe advantage of flexible and adjustable number provides the VSG virtual inertia input time t0The calculation method and the exit criterion can ensure that the VSG participates in the dynamic frequency modulation during large disturbance and the VSG is not input during small disturbance; the correctness and the effectiveness of the method provided by the application are verified. The method can solve the problem of inertia loss of the new energy power system and provide necessary frequency support for the power grid.
Example 3
Fig. 5 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 5, the terminal device 2 of this embodiment includes: a processor 20, a memory 21 and a computer program 22 stored in said memory 21 and executable on said processor 20. The processor 20, when executing the computer program 22, implements the steps in the above-mentioned virtual synchronous generator virtual inertia forward and backward control method embodiment, such as the steps S1 to S5 shown in fig. 1. Alternatively, the processor 20 implements the functions of the modules/units in the above-described device embodiments when executing the computer program 22.
The computer program 22 may be divided into one or more modules/units, which are stored in the memory 21 and executed by the processor 20 to accomplish the present invention. 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 process of the computer program 22 in the terminal device 2.
The terminal device 2 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 20, a memory 21. It will be appreciated by those skilled in the art that fig. 5 is merely an example of a terminal device 2 and does not constitute a limitation of the terminal device 2 and may include more or less components than those shown, or some components may be combined, or different components, for example the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 20 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 21 may be an internal storage unit of the terminal device 2, such as a hard disk or a memory of the terminal device 2. The memory 21 may also be an external storage device of the terminal device 3, 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 terminal device 2. Further, the memory 21 may also include both an internal storage unit and an external storage device of the terminal device 3. The memory 21 is used for storing the computer program and other programs and data required by the terminal device. The memory 21 may also be used to temporarily store data that has been output or is to be output.
Example 4
As shown in fig. 6, fig. 6 is a schematic structural diagram of a virtual inertia forward/backward control system of a virtual synchronous generator according to an embodiment of the present invention, where the system includes:
the parameter acquisition module 201 is used for acquiring data of the change of the angular frequency of the power grid along with time; t is tkThe grid angular frequency measured at a time is denoted by ωk；
A maximum offset occurrence time calculation module 202, configured to determine a maximum offset occurrence time of the power grid angular frequency based on the data of the power grid angular frequency changing with time;
the power grid angular frequency deviation threshold calculation module 203 is used for determining a power grid angular frequency deviation threshold according to the power grid rated angular frequency;
an input VSG virtual inertia moment calculation module 204, configured to calculate an input VSG virtual inertia moment based on the grid angular frequency maximum offset occurrence moment and the grid angular frequency deviation threshold;
the determining module 205 is configured to determine whether the VSG virtual inertia needs to be exited according to the data of the change of the grid angular frequency along with time, and if yes, obtain an exiting time of the VSG virtual inertia.
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. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and 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/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device 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 place, or may be distributed on a plurality of 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. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting 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 virtual inertia switching control method of a virtual synchronous generator is characterized by comprising the following steps:
acquiring data of the change of the angular frequency of the power grid along with time; t is tkThe grid angular frequency measured at a time is denoted by ωk；
Determining the occurrence time of the maximum offset of the angular frequency of the power grid based on the data of the angular frequency of the power grid changing along with time;
determining a power grid angular frequency deviation threshold according to the power grid rated angular frequency;
calculating the VSG virtual inertia moment based on the power grid angular frequency maximum offset moment and the power grid angular frequency deviation threshold;
and judging whether the VSG virtual inertia needs to be quitted according to the data of the change of the angular frequency of the power grid along with the time, and if so, acquiring the quitting time of the VSG virtual inertia.
2. The virtual inertia switching control method of the virtual synchronous generator according to claim 1, wherein the determining the occurrence time of the maximum offset of the grid angular frequency based on the data of the grid angular frequency changing with time specifically includes:
calculate Δ ω(k+1)＝ω(k+1)-ωk；
Calculate Δ ωk＝ωk-ω(k-1)；
Judging whether the requirements are met
Figure FDA0002755706120000011
Wherein δ is less than 10-4A constant of (d);
if the maximum deviation is met, the occurrence time t of the maximum deviation of the dynamic frequency of the power grid is indicatedmIs tkI.e. tm＝tk。
3. The virtual inertia switching control method of the virtual synchronous generator according to claim 1, wherein the following formula is specifically adopted for determining the grid angular frequency deviation threshold according to the grid rated angular frequency:
Δωth＝(0.004～0.01)ωNwherein, ω isNFor rating the angular frequency, Δ ω, of the gridthIs the grid angular frequency deviation threshold.
4. The virtual inertia switching control method of the virtual synchronous generator according to claim 1, wherein the following formula is specifically adopted for calculating the VSG virtual inertia switching time based on the grid angular frequency maximum offset occurrence time and the grid angular frequency deviation threshold:
Figure FDA0002755706120000021
wherein A is1、A2、α1、α2、α3And alpha4Is composed of disturbance magnitude, inertia parameter, primary and secondaryConstant determined by regulation characteristic and load characteristic, t0Tau is a time constant, delta omega, for investing in VSG virtual inertia momentthAs grid angular frequency deviation threshold, tmAnd the time when the maximum offset of the angular frequency of the power grid occurs.
5. The method for controlling the virtual inertia of the virtual synchronous generator according to claim 1, wherein the step of determining whether the VSG virtual inertia needs to be exited according to the data of the change of the grid angular frequency with time, and if so, the step of obtaining the exiting time of the VSG virtual inertia specifically includes:
judging whether the requirements are met
Figure FDA0002755706120000022
If yes, the VSG virtual inertia needs to be quitted, and the quitting time of the VSG virtual inertia is tq+1Wherein, ω isqIs tqThe grid angular frequency measured at the moment.
6. A virtual inertia of virtual synchronous generator control system that moves on and off, characterized in that, the control system includes:
the parameter acquisition module is used for acquiring data of the change of the angular frequency of the power grid along with time; t is tkThe grid angular frequency measured at a time is denoted by ωk；
The maximum offset occurrence time calculation module is used for determining the maximum offset occurrence time of the power grid angular frequency based on the data of the power grid angular frequency changing along with time;
the power grid angular frequency deviation threshold calculation module is used for determining a power grid angular frequency deviation threshold according to the rated angular frequency of the power grid;
the input VSG virtual inertia moment calculation module is used for calculating input VSG virtual inertia moment based on the power grid angular frequency maximum offset occurrence moment and the power grid angular frequency deviation threshold;
and the judging module is used for judging whether the VSG virtual inertia needs to be quitted according to the data of the angular frequency of the power grid changing along with the time, and if so, obtaining the quitting time of the VSG virtual inertia.
7. The virtual inertia on-off control system of the virtual synchronous generator according to claim 6, wherein the maximum offset occurrence time calculation module comprises:
calculate Δ ω(k+1)＝ω(k+1)-ωk；
Calculate Δ ωk＝ωk-ω(k-1)；
Judging whether the requirements are met
Figure FDA0002755706120000031
Wherein δ is less than 10-4A constant of (d);
if the maximum deviation is met, the occurrence time t of the maximum deviation of the dynamic frequency of the power grid is indicatedmIs tkI.e. tm＝tk。
8. The virtual inertia switching control system of the virtual synchronous generator according to claim 6, wherein the grid angular frequency deviation threshold calculation module specifically adopts the following formula:
Δωth＝(0.004～0.01)ωNwherein, ω isNFor rating the angular frequency, Δ ω, of the gridthIs the grid angular frequency deviation threshold.
9. The virtual inertia switching control system of claim 6, wherein the input VSG virtual inertia time calculation module specifically adopts the following formula:
Figure FDA0002755706120000032
wherein A is1、A2、α1、α2、α3And alpha4Is a constant determined by the disturbance magnitude, inertia parameters, primary and secondary regulation characteristics, and load characteristics, t0Tau is a time constant, delta omega, for investing in VSG virtual inertia momentthFor deviation of angular frequency of electric networkThreshold value, tmAnd the time when the maximum offset of the angular frequency of the power grid occurs.
10. The virtual inertia switching control system of claim 6, wherein the determining module comprises:
judging whether the requirements are met
Figure FDA0002755706120000033
If yes, the VSG virtual inertia needs to be quitted, and the quitting time of the VSG virtual inertia is tq+1Wherein, ω isqIs tqThe grid angular frequency measured at the moment.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105978027A (en) * 2016-06-21 2016-09-28 青海大学 Frequency control method and system for transient process of virtual synchronous generator
CN107846029A (en) * 2017-10-18 2018-03-27 上海电力学院 A kind of adaptive inertia damping integrated control method of virtual synchronous generator
US20180191281A1 (en) * 2016-10-17 2018-07-05 Qingchang ZHONG Operating Doubly-Fed Induction Generators as Virtual Synchronous Generators
CN110311402A (en) * 2018-03-27 2019-10-08 中国电力科学研究院有限公司 A kind of control method and system of virtual synchronous generator
CN111756054A (en) * 2020-06-09 2020-10-09 江苏大学 VSG control method based on inertia and virtual impedance cooperative self-adaption

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105978027A (en) * 2016-06-21 2016-09-28 青海大学 Frequency control method and system for transient process of virtual synchronous generator
US20180191281A1 (en) * 2016-10-17 2018-07-05 Qingchang ZHONG Operating Doubly-Fed Induction Generators as Virtual Synchronous Generators
CN107846029A (en) * 2017-10-18 2018-03-27 上海电力学院 A kind of adaptive inertia damping integrated control method of virtual synchronous generator
CN110311402A (en) * 2018-03-27 2019-10-08 中国电力科学研究院有限公司 A kind of control method and system of virtual synchronous generator
CN111756054A (en) * 2020-06-09 2020-10-09 江苏大学 VSG control method based on inertia and virtual impedance cooperative self-adaption

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