CN117674187A - Voltage excitation signal amplitude adjusting method suitable for reverse impedance modeling - Google Patents

Voltage excitation signal amplitude adjusting method suitable for reverse impedance modeling Download PDF

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Publication number
CN117674187A
CN117674187A CN202311562047.2A CN202311562047A CN117674187A CN 117674187 A CN117674187 A CN 117674187A CN 202311562047 A CN202311562047 A CN 202311562047A CN 117674187 A CN117674187 A CN 117674187A
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voltage excitation
excitation signal
instantaneous power
power
amplitude
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马宁宁
纪坤华
柳劲松
雷兴
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Tsinghua University
State Grid Shanghai Electric Power Co Ltd
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Tsinghua University
State Grid Shanghai Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/04—Power grid distribution 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
    • 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
    • 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
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously

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Abstract

The application relates to a voltage excitation signal amplitude adjustment method suitable for reverse impedance modeling. The method comprises the following steps: and applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, collecting the instantaneous power characteristics of the power electronic equipment grid-connected point at different moments, and adjusting the amplitude values of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals. According to the method, the voltage excitation signal is applied to the grid-connected point of the power electronic equipment, and the amplitude of the voltage excitation signal is adjusted according to the instantaneous power characteristic acquired from the grid-connected point of the power electronic equipment, so that the adjusted voltage excitation signal can determine an accurate impedance model.

Description

Voltage excitation signal amplitude adjusting method suitable for reverse impedance modeling
Technical Field
The application relates to the technical field of power distribution networks, in particular to a voltage excitation signal amplitude adjusting method suitable for reverse impedance modeling.
Background
With the gradual access of distributed energy sources, energy storage devices and the like, the power electronic characteristics of a power distribution network are increasingly becoming an obvious trend of the development of power distribution network devices in the future, for example, how to determine an impedance model for power electronic devices is becoming a focus of research.
At present, in order to acquire an impedance model of power electronic equipment, an external excitation disturbance signal needs to be injected into a system which runs stably, and then a frequency coupling impedance model is calculated according to disturbance response of the power electronic equipment. The magnitude of the external excitation signal plays a crucial role in identifying the impedance model.
Therefore, how to adjust the amplitude of the external excitation signal is a problem to be solved.
Disclosure of Invention
Based on this, it is necessary to provide a method for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling, which can adjust the amplitude of the external excitation signal to improve the accuracy of determining the impedance model of the power electronic device, in order to solve the above-mentioned technical problems.
In a first aspect, the present application provides a method for adjusting a voltage excitation signal amplitude suitable for reverse impedance modeling, including:
applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In one embodiment, the adjusting the amplitude of the voltage excitation signal with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signal includes:
performing discrete Fourier transform on the instantaneous power characteristics at different moments to determine target instantaneous power characteristics;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power characteristics to obtain the adjusted voltage excitation signals.
In one embodiment, the adjusting the amplitude of the voltage excitation signal with different frequencies according to the target instantaneous power characteristic to obtain the adjusted voltage excitation signal includes:
acquiring a minimum power threshold, a maximum power threshold and an intermediate power threshold;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power, the minimum power threshold, the maximum power threshold and the intermediate power threshold to obtain the adjusted voltage excitation signals.
In one embodiment, the adjusting the amplitude of the voltage excitation signal with different frequencies according to the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold and the intermediate power threshold to obtain an adjusted voltage excitation signal includes:
If the target instantaneous power characteristic is smaller than the minimum power threshold, increasing the amplitude of the voltage excitation signals with different frequencies to obtain the increased voltage excitation signals;
if the target instantaneous power characteristic is larger than the maximum power threshold, reducing the amplitude of the voltage excitation signals with different frequencies to obtain reduced voltage excitation signals;
if the target instantaneous power characteristic is larger than the minimum power threshold and smaller than the intermediate power threshold, increasing the amplitude of the voltage excitation signals with different frequencies, and taking the increased voltage excitation signals as voltage excitation signals applied to the grid-connected point of the power electronic equipment next time;
if the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude of the voltage excitation signal at a different frequency is not adjusted.
In one embodiment, performing discrete fourier transform on the instantaneous power characteristics at different moments to determine the target instantaneous power characteristics includes:
performing discrete Fourier transform on the instantaneous power characteristics at different moments, and decomposing the instantaneous power characteristics at different moments into different frequency components of the instantaneous power;
the maximum frequency component of the different frequency components of the instantaneous power is determined as the target instantaneous power characteristic.
In one embodiment, the applying the voltage excitation signals with different frequencies to the power electronic device grid-connected point includes:
generating a three-phase voltage excitation signal according to the voltage excitation signals with different frequencies;
applying a three-phase voltage excitation signal to an external power source to cause the external power source to generate an actual voltage signal;
the actual voltage signal is applied to the power electronics grid connection point.
In one embodiment, the generating the three-phase voltage excitation signal according to the voltage excitation signals with different frequencies includes:
inputting related data of the voltage excitation signals into a preset three-phase voltage generator for operation to obtain three-phase voltage excitation signals; the correlation data includes the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal.
In a second aspect, the present application further provides an adjustment device for voltage excitation signal amplitude suitable for reverse impedance modeling, including:
the acquisition module is used for applying voltage excitation signals with different frequencies to the power electronic equipment grid connection points and acquiring instantaneous power characteristics of the power electronic equipment grid connection points at different moments;
the adjusting module is used for adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In a third aspect, the present application also provides a computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In a fourth aspect, the present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In a fifth aspect, the present application also provides a computer program product comprising a computer program which, when executed by a processor, performs the steps of:
Applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
According to the voltage excitation signal amplitude adjustment method suitable for reverse impedance modeling, voltage excitation signals with different frequencies are applied to the power electronic equipment grid-connected point, instantaneous power characteristics of the power electronic equipment grid-connected point at different moments are collected, and the amplitude of the voltage excitation signals with different frequencies is adjusted according to the instantaneous power characteristics at different moments, so that the adjusted voltage excitation signals are obtained. According to the method, the excitation signal is applied to the grid-connected point of the power electronic equipment, the voltage excitation signal is adjusted according to the instantaneous power characteristic acquired by the power electronic equipment, so that an accurate impedance model can be determined by the adjusted voltage excitation signal.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical 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 other drawings may be obtained according to the drawings without inventive effort for a person having ordinary skill in the art.
FIG. 1 is a diagram of an application environment of a method of adjusting an excitation signal in one embodiment;
FIG. 2 is a flow chart of a method for adjusting an excitation signal according to an embodiment;
FIG. 3 is a flow chart illustrating a method for adjusting an excitation signal according to another embodiment;
FIG. 4 is a flow chart of a method for adjusting an excitation signal according to another embodiment;
FIG. 5 is a flow chart illustrating a method for adjusting an excitation signal according to another embodiment;
FIG. 6 is a flow chart illustrating a method for adjusting an excitation signal according to another embodiment;
FIG. 7 is a flow chart illustrating a method for adjusting an excitation signal according to another embodiment;
FIG. 8 is a block diagram of an apparatus for adjusting an excitation signal in one embodiment;
FIG. 9 is a block diagram of an apparatus for adjusting an excitation signal in one embodiment;
Fig. 10 is a block diagram of a device for adjusting an excitation signal according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
With the gradual access of distributed energy sources, energy storage devices and the like, the power electronic characteristics of the power distribution network are increasingly prominent, and the power distribution network gradually becomes an obvious trend of the development of power distribution network devices in the future, for example, how to determine an impedance model for power electronic devices is becoming the focus of research. At present, in order to acquire an impedance model of power electronic equipment with unknown parameters and structures, external excitation disturbance signals need to be injected into a system which runs stably, and then a frequency coupling impedance model is calculated according to disturbance response of the power equipment. The magnitude of the external excitation signal has a crucial effect on the identification of the impedance model, when the magnitude of the external excitation signal is selected, the magnitude of the external excitation signal needs to be large enough because of considering that the high identification accuracy needs to be enough in signal to noise ratio, and the magnitude of the external excitation signal is too large to influence the normal operation of the system, even the steady-state operation point is offset, the linearization condition cannot be met, and an incorrect identification result appears, so that the magnitude of the external excitation signal is small enough. Therefore, how to adjust the amplitude of the external excitation signal is a problem to be solved. The present application aims to solve this problem.
After the background art of the method for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling provided in the embodiment of the present application is described, an implementation environment related to the method for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling provided in the embodiment of the present application will be briefly described below. The method for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling, provided by the embodiment of the application, can be applied to computer equipment shown in fig. 1. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of adjusting the amplitude of a voltage excitation signal suitable for reverse impedance modeling. The display unit of the computer device is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
After the application scenario of the method for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling provided by the embodiment of the application is described, the method for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling is described in the following.
In one embodiment, as shown in fig. 2, a method for adjusting the amplitude of a voltage excitation signal suitable for reverse impedance modeling is provided, and the method is applied to the computer device in fig. 1 for illustration, and includes the following steps:
and S201, applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments.
Wherein the voltage excitation signals with different frequencies can be a pair of frequencies f c And f s The voltage excitation signal comprises parameters such as the amplitude of the signal, the phase of the signal, the frequency of the signal and the like, and the voltage excitation signal can be sent out by an external signal generator, and the frequency f is needed to be described c And frequency f s The following formula (1) must be satisfied:
f c +f s ＝100 (1)；
in the above formula (1), f c And f s Is in Hz.
The power electronic equipment can comprise a converter, an electronic switch, an electronic alternating current power controller and the like, and the type of the power electronic equipment is not limited in the embodiment of the application.
The instantaneous power characteristics comprise parameters such as amplitude of the instantaneous power, phase of the instantaneous power and the like.
In this embodiment, before the computer device needs to adjust the amplitude of the voltage excitation signal, so that an impedance model of the electronic power device is determined based on the amplitude of the voltage excitation signal, the voltage excitation signals with different frequencies sent by the external signal generator need to be acquired, after the voltage excitation signals with different frequencies sent by the external signal generator are acquired, the voltage excitation signals with different frequencies are integrated to obtain an integrated electrical signal, so that the integrated electrical signal is applied to a grid-connected point of the electronic power device, instantaneous voltages of the grid-connected point of the electronic power device at different moments and instantaneous currents of the corresponding moments are acquired during injection of the integrated electrical signal, and instantaneous power characteristics of the grid-connected point of the electronic power device at different moments are determined according to the instantaneous voltages of the different moments and the instantaneous currents of the corresponding moments.
S202, adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In this embodiment of the present application, after the above-mentioned instantaneous power characteristics at different moments are determined, the target instantaneous power characteristics may be determined from the instantaneous power characteristics at different moments, and then the amplitudes of the voltage excitation signals with different frequencies are adjusted according to the target instantaneous power characteristics, so as to obtain the adjusted voltage excitation signals. Optionally, the computer device may perform decomposition processing on the instantaneous power features at different moments to obtain the decomposed instantaneous power features of different frequencies at different moments, then determine the target instantaneous power features according to the instantaneous power features of different frequencies at different moments, and then adjust the amplitude of the voltage excitation signal at different frequencies according to the relationship between the target instantaneous power features and the preset power range, so as to obtain the adjusted voltage excitation signal.
According to the voltage excitation signal amplitude adjustment method suitable for reverse impedance modeling, voltage excitation signals with different frequencies are applied to the power electronic equipment grid-connected point, instantaneous power characteristics of the power electronic equipment grid-connected point at different moments are collected, and the amplitude of the voltage excitation signals with different frequencies is adjusted according to the instantaneous power characteristics at different moments, so that the adjusted voltage excitation signals are obtained. According to the method, the voltage excitation signal is applied to the grid-connected point of the power electronic equipment, the amplitude of the voltage excitation signal is adjusted according to the instantaneous power characteristic acquired from the grid-connected point of the power electronic equipment, so that an accurate impedance model can be determined by the adjusted voltage excitation signal.
In one embodiment, the process of obtaining the adjusted voltage excitation signal may be described based on the embodiment shown in fig. 2, as shown in fig. 3, S202 "the adjusting the amplitude of the voltage excitation signal with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signal", which includes:
s301, performing discrete Fourier transform on the instantaneous power characteristics at different moments to determine target instantaneous power characteristics.
In this embodiment of the present application, after the above-mentioned instantaneous power features at different times are obtained, recursive discrete fourier transform decomposition may be performed on the instantaneous power features at different times according to different frequencies to obtain instantaneous power features at different times at different frequencies, and the target instantaneous power features are determined from the instantaneous power features at different times at different frequencies. Alternatively, the largest instantaneous power characteristic of the instantaneous power characteristics at different moments in time at different frequencies may be determined as the target instantaneous power characteristic, the smallest instantaneous power characteristic of the instantaneous power characteristics at different moments in time at different frequencies may be determined as the target instantaneous power characteristic, and the middle instantaneous power characteristic of the instantaneous power characteristics at different moments in time at different frequencies may be determined as the target instantaneous power characteristic.
Optionally, a method for determining the target instantaneous power feature is provided below, that is, S301 "discrete fourier transform the instantaneous power features at different moments to determine the target instantaneous power feature", as shown in fig. 4, including:
s3011, performing discrete Fourier transform on the instantaneous power characteristics at different moments, and decomposing the instantaneous power characteristics at different moments into different frequency components of the instantaneous power.
Wherein the different frequency components of the instantaneous power include f of the instantaneous power c F of component and instantaneous Power s A component.
In this embodiment of the present application, after the above-mentioned instantaneous power features at different moments are obtained, recursive discrete fourier transform may be performed on the instantaneous power features at different moments, so as to decompose the instantaneous power features at different moments into different frequency components of the instantaneous power. Alternatively, the process of performing the recursive discrete fourier transform decomposition on the instantaneous power characteristics at different times may be represented by the following equation (2):
where N represents the number of data in the time series x, r represents the frequency number, r=0, 1, …, N-1. Where X [ mΔt ] represents a time series, m=k, k+1, k+2, …, k+n-1, and assuming that the result after subjecting the time series to the recursive discrete fourier transform decomposition is X (k, r), then moving the time series forward by one time point forms a new time series X [ (m+1) Δt ], the recursive discrete fourier transform result of which can be expressed as X (k+1, r).
It should be noted that, the instantaneous power characteristics at different moments are input into the discrete fourier transform formula shown in the above formula (2), so as to obtain the frequencies f c And f s The components of instantaneous power at different moments, i.e. P fc ＝[P fc 1,P fc 2,…,P fc N]And P fs ＝[P fs 1,P fs 2,…,P fs N]Wherein 1,2,3,..n represents different moments in time, P fc 1,P fc 2,…,P fc N represents the frequency f c The components of instantaneous power at different moments, P fs 1,P fs 2,…,P fs N represents the frequency f s Components of instantaneous power at different times.
S3012, determining the maximum frequency component among different frequency components of the instantaneous power as a target instantaneous power characteristic.
In the embodiment of the present application, after the above-mentioned different frequency components of the instantaneous power are obtained, the largest instantaneous power component among the different frequency components of the instantaneous power is determined as the target instantaneous power characteristic. For example, the obtained frequencies are f c And f s The components of instantaneous power at different moments, i.e. P fc ＝[P fc 1,P fc 2,…,P fc N]And P fs ＝[P fs 1,P fs 2,…,P fs N]From these 2N instantaneous power components, a maximum instantaneous power component may then be determined as the target instantaneous power characteristic.
S302, adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power characteristics to obtain the adjusted voltage excitation signals.
In this embodiment of the present application, after the target instantaneous power characteristic is determined, the amplitude of the voltage excitation signal with different frequencies may be adjusted according to the relationship between the target instantaneous power characteristic and the preset power range, so as to obtain the adjusted voltage excitation signal.
Optionally, a method for obtaining the adjusted voltage excitation signal is provided below, that is, S302 "the amplitude of the voltage excitation signal with different frequencies is adjusted according to the target instantaneous power characteristic, to obtain an adjusted voltage excitation signal", as shown in fig. 5, including:
s3021, acquiring a minimum power threshold, a maximum power threshold, and an intermediate power threshold.
The minimum power threshold value can be the product of a minimum power threshold value coefficient and initial power, the maximum power threshold value can be the product of a maximum power threshold value coefficient and initial power, the intermediate power threshold value can be the product of an intermediate power threshold value coefficient and initial power, and the initial power refers to the power of the grid-connected point of the power electronic equipment when the system runs stably before an external excitation signal is injected into the power electronic equipment, and the power can be calculated by the grid-connected point voltage and current of the power electronic equipment. It should be noted that, the minimum power threshold coefficient, the maximum power threshold coefficient, and the intermediate power threshold coefficient may be directly set according to an operator, and in general, the minimum power threshold coefficient, the maximum power threshold coefficient, and the intermediate power threshold coefficient may be set to 0.005, 0.1, and 0.02, respectively. The voltage and current of the power electronic device grid connection point can be directly obtained through measurement of the measuring device.
In this embodiment of the present application, before the adjusted voltage excitation signal is obtained, the minimum power threshold, the maximum power threshold, and the intermediate power threshold are further required to be obtained according to the minimum power threshold coefficient, the maximum power threshold coefficient, the intermediate power threshold coefficient, and the initial power.
And S3022, adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power characteristics to obtain the adjusted voltage excitation signals.
In this embodiment of the present application, after the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold, and the intermediate power threshold are obtained, the voltage excitation signals with different frequencies may be adjusted according to the obtained relationship among the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold, and the intermediate power threshold, so as to obtain the adjusted voltage excitation signal.
Optionally, the following provides a specific implementation manner for obtaining the adjusted voltage excitation signal, that is, S3022 "adjust the amplitude of the voltage excitation signal with different frequencies according to the target instantaneous power, the minimum power threshold, the maximum power threshold, and the intermediate power threshold to obtain the adjusted voltage excitation signal", including:
If the target instantaneous power characteristic is smaller than the minimum power threshold, increasing the amplitude of the voltage excitation signals with different frequencies to obtain the increased voltage excitation signals.
In this embodiment of the present application, after the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold, and the intermediate power threshold are obtained, if the target instantaneous power characteristic is smaller than the minimum power threshold, the amplitudes of the voltage excitation signals with different frequencies are increased, and the increased voltage excitation signals are obtained. For example, when the target instantaneous power P m <Minimum power threshold P min When the amplitude Deltau of the external voltage excitation signal is too small, the frequency f needs to be increased appropriately c Amplitude u of corresponding voltage excitation signal c And increasing the frequency f s Amplitude u of corresponding voltage excitation signal s After the increased voltage excitation signal is obtained, re-injecting the increased voltage excitation signal into a grid-connected point of the power electronic equipment, re-acquiring the instantaneous power characteristics at different moments, further obtaining target instantaneous power characteristics, then judging whether the target instantaneous power characteristics are between a value larger than an intermediate power threshold and smaller than a maximum power threshold again, and if the target instantaneous power characteristics are between the value larger than the intermediate power threshold and smaller than the maximum power threshold, obtaining according to the increased voltage excitation signal And if the target instantaneous power characteristic is not between the middle power threshold and the maximum power threshold, continuing to adjust the voltage excitation signal until the target instantaneous power characteristic is between the middle power threshold and the maximum power threshold, thereby obtaining the impedance model of the power electronic equipment according to the adjusted voltage excitation signal.
If the target instantaneous power characteristic is larger than the maximum power threshold, the amplitude of the voltage excitation signals with different frequencies is reduced, and the reduced voltage excitation signals are obtained.
In this embodiment of the present application, after the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold, and the intermediate power threshold are obtained, if the target instantaneous power characteristic is greater than the maximum power threshold, the amplitudes of the voltage excitation signals with different frequencies are reduced, and the reduced voltage excitation signals are obtained. For example, when the target instantaneous power P m >Maximum power threshold P max When the amplitude Deltau of the external excitation signal is too large, the frequency f needs to be properly reduced c Amplitude u of corresponding voltage excitation signal c And reducing the frequency f s Amplitude u of corresponding voltage excitation signal s And re-injecting the reduced voltage excitation signal into the grid-connected point of the power electronic equipment after obtaining the reduced voltage excitation signal, re-acquiring the instantaneous power characteristics at different moments, further obtaining the target instantaneous power characteristics, then judging whether the target instantaneous power characteristics are between a middle power threshold value and a maximum power threshold value or not again, obtaining an impedance model of the power electronic equipment according to the reduced voltage excitation signal if the target instantaneous power characteristics are between the middle power threshold value and the maximum power threshold value, and continuously adjusting the voltage excitation signal if the target instantaneous power characteristics are not between the middle power threshold value and the maximum power threshold value until the target instantaneous power characteristics are between the middle power threshold value and the maximum power threshold value, thereby obtaining the impedance model of the power electronic equipment according to the adjusted voltage excitation signal.
If the target instantaneous power characteristic is larger than the minimum power threshold and smaller than the intermediate power threshold, increasing the amplitude of the voltage excitation signals with different frequencies, and taking the increased voltage excitation signals as voltage excitation signals applied to the power electronic equipment grid-connected point next time.
In this embodiment of the present application, after the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold, and the intermediate power threshold are obtained, if the target instantaneous power characteristic is greater than the minimum power threshold and less than the intermediate power threshold, the amplitude of the current voltage excitation signal is not adjusted, but the amplitudes of the voltage excitation signals with different frequencies need to be increased, and the increased voltage excitation signal is used as the voltage excitation signal applied to the grid-connected point of the power electronic device next time, so as to obtain the increased excitation signal. For example, when the minimum power threshold P min <Target instantaneous power P m <Intermediate power threshold P mid When the amplitude of the current voltage excitation signal is not adjusted, but the frequency f needs to be increased appropriately c Amplitude u of corresponding voltage excitation signal c And increasing the frequency f s Amplitude u of corresponding voltage excitation signal s And after the increased voltage excitation signal is obtained, re-injecting the increased voltage excitation signal into a grid-connected point of the power electronic equipment, re-acquiring the instantaneous power characteristic, further obtaining the target instantaneous power characteristic, then judging whether the target instantaneous power characteristic is between a middle power threshold value and a maximum power threshold value or not again, obtaining an impedance model of the power electronic equipment according to the increased voltage excitation signal if the target instantaneous power characteristic is between the middle power threshold value and the maximum power threshold value, and continuously adjusting the voltage excitation signal if the target instantaneous power characteristic is not between the middle power threshold value and the maximum power threshold value until the target instantaneous power characteristic is between the middle power threshold value and the maximum power threshold value, thereby obtaining the impedance model of the power electronic equipment according to the adjusted voltage excitation signal.
If the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude of the voltage excitation signal at a different frequency is not adjusted.
In this embodiment of the present application, after the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold, and the intermediate power threshold are obtained, if the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude values of the voltage excitation signals with different frequencies are not adjusted, and the impedance model of the power electronic device is directly determined according to the amplitude values of the voltage excitation signals with different frequencies. For example, an intermediate power threshold P mid <Target instantaneous power P m <Maximum power threshold P max And when the impedance model of the power electronic equipment is determined directly according to the amplitude values of the voltage excitation signals with different frequencies without adjusting the amplitude values of the voltage excitation signals with different frequencies.
According to the method for adjusting the voltage excitation signal, the maximum instantaneous power component in the different frequency components of the instantaneous power is determined to be the target instantaneous power characteristic, the voltage excitation signals with different frequencies are adjusted based on the target instantaneous power characteristic, the adjusted voltage excitation signal is obtained, and the impedance model is determined based on the adjusted voltage excitation signal, so that the determined impedance model is more accurate.
In one embodiment, a process of applying excitation signals with different frequencies to the power electronic device grid-tie point may be described based on the embodiment shown in fig. 2, and as shown in fig. 6, the step of applying S201 "the voltage excitation signals with different frequencies to the power electronic device grid-tie point" includes:
s401, generating a three-phase voltage excitation signal according to the voltage excitation signals with different frequencies.
In the embodiment of the present application, the excitation signals with different frequencies may be a pair of frequencies f c And f s The voltage excitation signal comprises parameters such as the amplitude of the signal, the phase of the signal, the frequency of the signal and the like, and then the three-phase voltage excitation signal is determined according to the parameters such as the amplitude, the phase, the frequency and the like of the excitation signal.
Optionally, a process of generating a three-phase voltage excitation signal according to a voltage excitation signal of a different frequency is provided below, that is, S401 "generating a three-phase voltage excitation signal according to a voltage excitation signal of a different frequency", including:
and inputting the related data of the voltage excitation signals into a preset three-phase voltage generator for operation to obtain the three-phase excitation signals.
Wherein the related data includes the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal.
In this embodiment of the present application, after the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal are obtained, the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal may be input into a preset three-phase voltage generator to perform calculation, so as to obtain a three-phase excitation signal. Optionally, the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal and the phase of the voltage excitation signal are input into a preset three-phase voltage generator for calculation, and the process of obtaining the three-phase excitation signal can be represented by the following formula (3):
wherein Deltau a 、Δu b And Deltau a Respectively representing three-phase excitation electrical signals applied to an external voltage.
And S402, applying a three-phase voltage excitation signal to an external power supply so that the external power supply generates an actual voltage signal.
In the embodiment of the present application, after the three-phase voltage excitation signal is obtained, the obtained three-phase voltage excitation signal may be applied to the external power source, so that the external power source generates the actual voltage signal based on the applied three-phase voltage excitation signal.
S403, applying the actual voltage signal to the power electronic equipment grid connection point.
In this embodiment of the present application, after the three-phase excitation signal is applied to the external power supply so that the external power supply generates the actual voltage signal, the actual voltage signal may be directly applied to the power electronic device grid-connected point, so that the instantaneous voltage and the instantaneous current on the power electronic device grid-connected point can be acquired subsequently based on the actual voltage signal.
According to the method for applying the voltage excitation signal to the power electronic equipment grid-connected point, the three-phase voltage excitation signal is generated, and the three-phase voltage excitation signal is applied to the power electronic equipment grid-connected point, so that the instantaneous voltage and the instantaneous current on the power electronic equipment grid-connected point can be acquired subsequently based on the three-phase voltage excitation signal.
In one embodiment, as shown in fig. 7, there is also provided a complete voltage excitation signal amplitude adjustment method suitable for reverse impedance modeling, including:
s10, inputting the amplitude, frequency and phase of the voltage excitation signal into a preset three-phase voltage generator for calculation to obtain a three-phase voltage excitation signal;
s11, applying a three-phase voltage excitation signal to an external power supply so as to enable the external power supply to generate an actual voltage signal;
S12, applying an actual voltage signal to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
s13, performing discrete Fourier transform on the instantaneous power characteristics at different moments, and decomposing the instantaneous power characteristics at different moments into different frequency components of the instantaneous power;
s14, determining the maximum frequency component in different frequency components of the instantaneous power as a target instantaneous power characteristic;
s15, acquiring a minimum power threshold, a maximum power threshold and an intermediate power threshold;
s16, according to the target instantaneous power, the minimum power threshold, the maximum power threshold and the middle power threshold, the amplitude values of the voltage excitation signals with different frequencies are adjusted, and the adjusted voltage excitation signals are obtained.
According to the method, the voltage excitation signal is applied to the grid-connected point of the power electronic equipment, the amplitude of the voltage excitation signal is adjusted according to the instantaneous power characteristic acquired from the grid-connected point of the power electronic equipment, so that an accurate impedance model can be determined by the adjusted voltage excitation signal.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a device for adjusting the amplitude of the voltage excitation signal suitable for the reverse impedance modeling, which is used for realizing the above-mentioned adjusting method for the amplitude of the voltage excitation signal suitable for the reverse impedance modeling. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation in the embodiments of the device for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling provided below may be referred to the limitation of the method for adjusting the amplitude of the voltage excitation signal suitable for reverse impedance modeling hereinabove, which is not repeated herein.
In an exemplary embodiment, as shown in fig. 8, there is provided an adjusting apparatus for voltage excitation signal amplitude suitable for reverse impedance modeling, including: an acquisition module 10 and an adjustment module 11, wherein:
the acquisition module 10 is used for applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point and acquiring the instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
the adjusting module 11 is configured to adjust the amplitude of the voltage excitation signal with different frequencies according to the instantaneous power characteristics at different moments, so as to obtain an adjusted voltage excitation signal.
In an exemplary embodiment, as shown in fig. 9, the adjusting module 11 includes: a transformation unit 110 and an adjustment unit 111, wherein:
the transforming unit 110 is specifically configured to perform discrete fourier transform on the instantaneous power characteristics at different moments, and determine a target instantaneous power characteristic;
the adjusting unit 111 is specifically configured to adjust the amplitude of the voltage excitation signal with different frequencies according to the target instantaneous power characteristic, so as to obtain an adjusted voltage excitation signal.
In an exemplary embodiment, the adjusting unit 111 is specifically configured to obtain a minimum power threshold value, a maximum power threshold value, and an intermediate power threshold value; and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power, the minimum power threshold, the maximum power threshold and the intermediate power threshold to obtain the adjusted voltage excitation signals.
In an exemplary embodiment, the adjusting unit 111 is specifically configured to increase the amplitude of the voltage excitation signal with different frequencies if the target instantaneous power characteristic is smaller than the minimum power threshold, so as to obtain an increased voltage excitation signal; if the target instantaneous power characteristic is larger than the maximum power threshold, reducing the amplitude of the voltage excitation signals with different frequencies to obtain reduced voltage excitation signals; if the target instantaneous power characteristic is larger than the minimum power threshold and smaller than the intermediate power threshold, increasing the amplitude of the voltage excitation signals with different frequencies, and taking the increased voltage excitation signals as voltage excitation signals applied to the grid-connected point of the power electronic equipment next time; if the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude of the voltage excitation signal at a different frequency is not adjusted.
In an exemplary embodiment, the transforming unit 110 is specifically configured to perform discrete fourier transform on the instantaneous power features at different moments, and decompose the instantaneous power features at different moments into different frequency components of the instantaneous power; the maximum frequency component of the different frequency components of the instantaneous power is determined as the target instantaneous power characteristic.
In an exemplary embodiment, as shown in fig. 10, the acquisition module 10 includes: a generating unit 100, a first applying unit 101 and a second applying unit 102, wherein:
a generating unit 100, specifically configured to generate a three-phase voltage excitation signal according to voltage excitation signals of different frequencies;
a first applying unit 101 specifically configured to apply a three-phase voltage excitation signal to an external power source so that the external power source generates an actual voltage signal;
the second application unit 102 is specifically configured to apply the actual voltage signal to a power electronic device grid-tie point.
In an exemplary embodiment, the generating unit 100 is specifically configured to input relevant data of the voltage excitation signal into a preset three-phase voltage generator for operation, so as to obtain a three-phase voltage excitation signal; the correlation data includes the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal.
The respective modules in the above-described adjustment device for the excitation signal may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one exemplary embodiment, a computer device is provided, which may be a terminal, and an internal structure diagram thereof may be as shown in fig. 1. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of adjusting the amplitude of a voltage excitation signal suitable for reverse impedance modeling. The display unit of the computer device is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one exemplary embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In one embodiment, the processor when executing the computer program further performs the steps of:
performing discrete Fourier transform on the instantaneous power characteristics at different moments to determine target instantaneous power characteristics;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power characteristics to obtain the adjusted voltage excitation signals.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring a minimum power threshold, a maximum power threshold and an intermediate power threshold;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power, the minimum power threshold, the maximum power threshold and the intermediate power threshold to obtain the adjusted voltage excitation signals.
In one embodiment, the processor when executing the computer program further performs the steps of:
if the target instantaneous power characteristic is smaller than the minimum power threshold, increasing the amplitude of the voltage excitation signals with different frequencies to obtain the increased voltage excitation signals;
if the target instantaneous power characteristic is larger than the maximum power threshold, reducing the amplitude of the voltage excitation signals with different frequencies to obtain reduced voltage excitation signals;
if the target instantaneous power characteristic is larger than the minimum power threshold and smaller than the intermediate power threshold, increasing the amplitude of the voltage excitation signals with different frequencies, and taking the increased voltage excitation signals as voltage excitation signals applied to the grid-connected point of the power electronic equipment next time;
if the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude of the voltage excitation signal at a different frequency is not adjusted.
In one embodiment, the processor when executing the computer program further performs the steps of:
performing discrete Fourier transform on the instantaneous power characteristics at different moments, and decomposing the instantaneous power characteristics at different moments into different frequency components of the instantaneous power;
the maximum frequency component of the different frequency components of the instantaneous power is determined as the target instantaneous power characteristic.
In one embodiment, the processor when executing the computer program further performs the steps of:
generating a three-phase voltage excitation signal according to the voltage excitation signals with different frequencies;
applying a three-phase voltage excitation signal to an external power source to cause the external power source to generate an actual voltage signal;
the actual voltage signal is applied to the power electronics grid connection point.
In one embodiment, the processor when executing the computer program further performs the steps of:
inputting related data of the voltage excitation signals into a preset three-phase voltage generator for operation to obtain three-phase voltage excitation signals; the correlation data includes the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
Applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing discrete Fourier transform on the instantaneous power characteristics at different moments to determine target instantaneous power characteristics;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power characteristics to obtain the adjusted voltage excitation signals.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring a minimum power threshold, a maximum power threshold and an intermediate power threshold;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power, the minimum power threshold, the maximum power threshold and the intermediate power threshold to obtain the adjusted voltage excitation signals.
In one embodiment, the computer program when executed by the processor further performs the steps of:
If the target instantaneous power characteristic is smaller than the minimum power threshold, increasing the amplitude of the voltage excitation signals with different frequencies to obtain the increased voltage excitation signals;
if the target instantaneous power characteristic is larger than the maximum power threshold, reducing the amplitude of the voltage excitation signals with different frequencies to obtain reduced voltage excitation signals;
if the target instantaneous power characteristic is larger than the minimum power threshold and smaller than the intermediate power threshold, increasing the amplitude of the voltage excitation signals with different frequencies, and taking the increased voltage excitation signals as voltage excitation signals applied to the grid-connected point of the power electronic equipment next time;
if the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude of the voltage excitation signal at a different frequency is not adjusted.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing discrete Fourier transform on the instantaneous power characteristics at different moments, and decomposing the instantaneous power characteristics at different moments into different frequency components of the instantaneous power;
the maximum frequency component of the different frequency components of the instantaneous power is determined as the target instantaneous power characteristic.
In one embodiment, the computer program when executed by the processor further performs the steps of:
Generating a three-phase voltage excitation signal according to the voltage excitation signals with different frequencies;
applying a three-phase voltage excitation signal to an external power source to cause the external power source to generate an actual voltage signal;
the actual voltage signal is applied to the power electronics grid connection point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
inputting related data of the voltage excitation signals into a preset three-phase voltage generator for operation to obtain three-phase voltage excitation signals; the correlation data includes the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal.
In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:
applying voltage excitation signals with different frequencies to the power electronic equipment grid-connected point, and collecting instantaneous power characteristics of the power electronic equipment grid-connected point at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
In one embodiment, the computer program when executed by the processor further performs the steps of:
Performing discrete Fourier transform on the instantaneous power characteristics at different moments to determine target instantaneous power characteristics;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power characteristics to obtain the adjusted voltage excitation signals.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring a minimum power threshold, a maximum power threshold and an intermediate power threshold;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power, the minimum power threshold, the maximum power threshold and the intermediate power threshold to obtain the adjusted voltage excitation signals.
In one embodiment, the computer program when executed by the processor further performs the steps of:
if the target instantaneous power characteristic is smaller than the minimum power threshold, increasing the amplitude of the voltage excitation signals with different frequencies to obtain the increased voltage excitation signals;
if the target instantaneous power characteristic is larger than the maximum power threshold, reducing the amplitude of the voltage excitation signals with different frequencies to obtain reduced voltage excitation signals;
if the target instantaneous power characteristic is larger than the minimum power threshold and smaller than the intermediate power threshold, increasing the amplitude of the voltage excitation signals with different frequencies, and taking the increased voltage excitation signals as voltage excitation signals applied to the grid-connected point of the power electronic equipment next time;
If the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude of the voltage excitation signal at a different frequency is not adjusted.
In one embodiment, the computer program when executed by the processor further performs the steps of:
performing discrete Fourier transform on the instantaneous power characteristics at different moments, and decomposing the instantaneous power characteristics at different moments into different frequency components of the instantaneous power;
the maximum frequency component of the different frequency components of the instantaneous power is determined as the target instantaneous power characteristic.
In one embodiment, the computer program when executed by the processor further performs the steps of:
generating a three-phase voltage excitation signal according to the voltage excitation signals with different frequencies;
applying a three-phase voltage excitation signal to an external power source to cause the external power source to generate an actual voltage signal;
the actual voltage signal is applied to the power electronics grid connection point.
In one embodiment, the computer program when executed by the processor further performs the steps of:
inputting related data of the voltage excitation signals into a preset three-phase voltage generator for operation to obtain three-phase voltage excitation signals; the correlation data includes the amplitude of the voltage excitation signal, the frequency of the voltage excitation signal, and the phase of the voltage excitation signal.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims (10)

1. A method of adjusting the amplitude of a voltage excitation signal suitable for reverse impedance modeling, the method comprising:
applying voltage excitation signals with different frequencies to the power electronic equipment grid connection points, and collecting instantaneous power characteristics of the power electronic equipment grid connection points at different moments;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
2. The method according to claim 1, wherein adjusting the amplitude of the voltage excitation signal of the different frequencies according to the instantaneous power characteristics of the different moments to obtain the adjusted voltage excitation signal comprises:
performing discrete Fourier transform on the instantaneous power characteristics at different moments to determine target instantaneous power characteristics;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power characteristics to obtain the adjusted voltage excitation signals.
3. The method of claim 2, wherein adjusting the amplitude of the voltage excitation signal at the different frequencies according to the target instantaneous power characteristic results in an adjusted voltage excitation signal, comprising:
acquiring a minimum power threshold, a maximum power threshold and an intermediate power threshold;
and adjusting the amplitude of the voltage excitation signals with different frequencies according to the target instantaneous power, the minimum power threshold, the maximum power threshold and the intermediate power threshold to obtain the adjusted voltage excitation signals.
4. The method of claim 3, wherein adjusting the amplitude of the voltage excitation signal at the different frequencies according to the target instantaneous power characteristic, the minimum power threshold, the maximum power threshold, and the intermediate power threshold, results in an adjusted voltage excitation signal, comprising:
If the target instantaneous power characteristic is smaller than the minimum power threshold, increasing the amplitude of the voltage excitation signals with different frequencies to obtain increased voltage excitation signals;
if the target instantaneous power characteristic is larger than the maximum power threshold, reducing the amplitude of the voltage excitation signals with different frequencies to obtain reduced voltage excitation signals;
if the target instantaneous power characteristic is larger than the minimum power threshold and smaller than the intermediate power threshold, increasing the amplitude of the voltage excitation signals with different frequencies, and taking the increased voltage excitation signals as voltage excitation signals applied to the grid-connected point of the power electronic equipment next time;
if the target instantaneous power characteristic is greater than the intermediate power threshold and less than the maximum power threshold, the amplitude of the voltage excitation signal at the different frequency is not adjusted.
5. The method of claim 2, wherein said discrete fourier transforming the instantaneous power characteristics at the different times to determine a target instantaneous power characteristic comprises:
performing discrete Fourier transform on the instantaneous power characteristics at different moments, and decomposing the instantaneous power characteristics at different moments into different frequency components of the instantaneous power;
The maximum frequency component of the different frequency components of the instantaneous power is determined as the target instantaneous power characteristic.
6. The method of claim 1, wherein applying voltage excitation signals of different frequencies to a power electronics grid connection point comprises:
generating a three-phase voltage excitation signal according to the voltage excitation signals with different frequencies;
applying the three-phase voltage excitation signal to an external power source to cause the external power source to generate an actual voltage signal;
and applying the actual voltage signal to the power electronic device grid connection point.
7. The method of claim 6, wherein generating a three-phase voltage excitation signal from the voltage excitation signals of different frequencies comprises:
inputting the related data of the voltage excitation signal into a preset three-phase voltage generator for operation to obtain the three-phase voltage excitation signal; the correlation data includes an amplitude of the voltage excitation signal, a frequency of the voltage excitation signal, and a phase of the voltage excitation signal.
8. An apparatus for adjusting the amplitude of a voltage excitation signal suitable for reverse impedance modeling, the apparatus comprising:
The acquisition module is used for applying voltage excitation signals with different frequencies to the power electronic equipment grid connection points and acquiring instantaneous power characteristics of the power electronic equipment grid connection points at different moments;
and the adjusting module is used for adjusting the amplitude of the voltage excitation signals with different frequencies according to the instantaneous power characteristics at different moments to obtain the adjusted voltage excitation signals.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
CN202311562047.2A 2023-11-22 2023-11-22 Voltage excitation signal amplitude adjusting method suitable for reverse impedance modeling Pending CN117674187A (en)

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