CN110957743B - Power grid low-frequency locking method and device, wind power converter and computer storage medium - Google Patents
Power grid low-frequency locking method and device, wind power converter and computer storage medium Download PDFInfo
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The embodiment of the invention discloses a power grid low-frequency locking method, a device, a wind power converter and a computer storage medium, wherein the method is applied to the wind power converter and comprises the following steps: carrying out high-frequency filtering on an input power grid signal to obtain a first voltage signal with high-frequency components filtered; carrying out fundamental wave frequency selection on the first voltage signal to obtain a fundamental wave signal; mixing the first voltage signal with a fundamental wave signal to obtain a second voltage signal containing a low-frequency component; and carrying out low-frequency phase locking on the second voltage signal to obtain a phase-locked low-frequency signal. According to the technical scheme, the frequency selection of the fundamental wave is realized through the tuner and the like, the frequency is mixed with the voltage signal with the high-frequency component filtered out, so that the low-frequency component signal is obtained and low-frequency phase locking is carried out, the accurate low-frequency component in the power grid signal can be conveniently and quickly obtained, and extra hardware cost and the like are not required to be added.
Description
Technical Field
The invention relates to the technical field of wind power converters, in particular to a power grid low-frequency locking method and device, a wind power converter and a computer storage medium.
Background
With the continuous expansion of the scale of the wind generating set and the continuous increase of the capacity, series capacitance compensation is increased in a large scale in a circuit in order to improve the electric energy transmission capacity of some remote wind fields. However, the line-crosstalk selection, once unreasonable, tends to cause the series capacitance to resonate with the inductive load of the power transmission line. The resonance of the low-frequency signal has a great influence on the inductive load of the power transmission system, and the lower the frequency is, the lower the equivalent impedance of the system is, so that a small voltage generates a large current, which provides a great challenge to the stable operation of the system.
Some existing methods for low-frequency resonance suppression are too complex, and some methods do not consider the particularity of wind power grid-connected operation, namely the resonance frequency of an actual power grid is not a stable numerical value, so that the method for quickly and efficiently locking the frequency of the low-frequency component is very meaningful.
Disclosure of Invention
In view of this, embodiments of the present invention provide a power grid low-frequency locking method and apparatus, a wind power converter, and a computer storage medium, where a tuner and the like are used to implement fundamental frequency selection and perform frequency mixing with a voltage signal with a high-frequency component filtered out, so as to obtain a low-frequency component signal and perform low-frequency phase locking, so that a relatively accurate low-frequency component in a power grid signal can be obtained conveniently and quickly, and no additional hardware cost is required to be added.
The invention discloses a low-frequency locking method for a power grid, which is applied to a wind power converter and comprises the following steps:
carrying out high-frequency filtering on an input power grid signal to obtain a first voltage signal with high-frequency components filtered;
carrying out fundamental wave frequency selection on the first voltage signal to obtain a fundamental wave signal;
mixing the first voltage signal with the fundamental wave signal to obtain a second voltage signal containing low-frequency components;
and carrying out low-frequency phase locking on the second voltage signal to obtain a phase-locked low-frequency signal.
Further, in the above power grid low-frequency locking method, before the mixing, the method further includes:
carrying out amplitude phase correction on the fundamental wave signal to obtain a corrected fundamental wave signal;
the first voltage signal is then mixed with the corrected fundamental signal.
Further, in the power grid low-frequency locking method, the cut-off frequency of the filter corresponding to the high-frequency filtering is 20-30 times of the fundamental frequency of the power grid signal.
Further, in the above power grid low-frequency locking method, the frequency selection bandwidth of the fundamental frequency selection is greater than or equal to 1.5 Hz.
Further, in the above power grid low frequency locking method, the fundamental frequency selection employs an R resonator, and a transfer function g(s) of the R resonator is:
where s represents a complex variable, ki is a tuning coefficient, ωcIs a frequency bandwidth, omega0Is the fundamental frequency of the input signal.
Further, in the above power grid low-frequency locking method, the "performing amplitude phase correction on the fundamental wave signal to obtain a corrected fundamental wave signal" includes:
performing amplitude-frequency characteristic analysis on the fundamental wave signal to obtain a fundamental wave phase difference;
and carrying out amplitude correction and phase correction on the fundamental wave signal according to the fundamental wave phase difference to obtain a corrected fundamental wave signal.
Another embodiment of the present invention provides a power grid low-frequency locking device, which is applied to a wind power converter, and the device includes:
the high-frequency filtering module is used for performing high-frequency filtering on the input power grid signal to obtain a first voltage signal with high-frequency components filtered;
the fundamental wave frequency selection module is used for performing fundamental wave frequency selection on the first voltage signal to obtain a fundamental wave signal;
the frequency mixing module is used for mixing the first voltage signal with the fundamental wave signal to obtain a second voltage signal containing low-frequency components;
and the low-frequency phase locking module is used for carrying out low-frequency phase locking on the second voltage signal to obtain a phase-locked low-frequency signal.
Further, in the above power grid low frequency locking device, the device further includes:
the amplitude phase correction module is used for carrying out amplitude phase correction on the fundamental wave signal to obtain a corrected fundamental wave signal;
the frequency mixing module is further configured to mix the first voltage signal with the correction fundamental signal.
In a further embodiment of the present invention, a wind power converter is provided, which includes a processor and a memory, where the memory is used to store a computer program, and the processor is used to execute the computer program to implement the grid low frequency locking method.
Yet another embodiment of the present invention provides a computer storage medium storing a computer program which, when executed, implements the grid low frequency locking method according to the above.
According to the technical scheme, frequency selection of fundamental waves is achieved through a tuner and the like, frequency mixing is carried out on the selected fundamental wave components and the voltage signals with the high-frequency components filtered, low-frequency component signals are obtained, low-frequency phase locking is carried out, and finally the low-frequency components in the power grid voltage signals are obtained. The method can conveniently and quickly obtain the accurate low-frequency component in the power grid signal, and the steps are realized through software, so that extra hardware cost is not required to be added, and the practicability is good. In addition, in consideration of the possibility of introducing the amplitude of the fundamental wave and corresponding errors in the power grid signal when a tuner and the like perform fundamental wave frequency selection, amplitude and phase dynamic correction is also performed on the output fundamental wave component, so that a more accurate low-frequency component of low-frequency is obtained.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 shows a first flow diagram of a power grid low-frequency locking method according to an embodiment of the invention;
fig. 2 shows a second flow chart of the power grid low-frequency locking method according to the embodiment of the invention;
fig. 3 shows a first structural schematic diagram of a grid low-frequency locking device according to an embodiment of the invention;
fig. 4 shows a second structural diagram of the power grid low-frequency locking device according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Example 1
Referring to fig. 1, the present embodiment provides a power grid low-frequency locking method, which is applied to a wind power converter, and by using the method, the frequency of a low-frequency component in a power grid signal can be quickly and accurately locked without increasing hardware cost, so that effective suppression of the low-frequency component is facilitated, and the like. As shown in fig. 1, the grid low frequency locking method is explained in detail below.
Step S100, performing high-frequency filtering on the input power grid signal to obtain a first voltage signal with high-frequency components filtered.
For the step S100, after the grid signal is input into the wind power converter, the grid signal is subjected to high-frequency filtering processing to obtain a voltage signal containing a low-frequency component and a fundamental component. The grid signal may be, for example, a grid voltage signal of 690V 50Hz or 60 Hz. When the high-frequency filtering is performed, in addition to the higher harmonic component in the grid signal, the high-frequency filtering also includes a PWM high-frequency harmonic component generated by a high-frequency operation of a switching device such as an IGBT inside the wind power converter, and a high-frequency harmonic component of electromagnetic interference. For example, the interference frequency of the PWM high-frequency harmonic can be up to 1250Hz or even about 5000 Hz.
In order to filter the high-frequency component signals, preferably, a cut-off frequency of a filter corresponding to the high-frequency filtering may be 20 to 30 times a fundamental frequency of the input power grid signal. For example, when the fundamental frequency of the grid signal is 50Hz or 60Hz, the cut-off frequency of the high-frequency filtering may be 1000Hz to 1500Hz, and so on.
Step S200, performing fundamental frequency selection on the first voltage signal to obtain a fundamental signal.
For the step S200, after the first voltage signal with the high frequency component filtered out is obtained, frequency selection is further performed on the signal, so as to obtain the fundamental component in the grid voltage signal. Considering that the frequency fluctuation of the grid voltage signal is often small, for example, for the grid signal with the fundamental frequency of 50Hz or 60Hz, the frequency fluctuation range is usually ± 0.75 Hz. In this embodiment, the frequency-selecting bandwidth of the fundamental frequency selection is greater than or equal to 1.5 Hz.
Preferably, for the above-mentioned fundamental frequency selection, R resonators may be used for fundamental frequency selection. Exemplarily, the transfer function g(s) of the R resonator may be:
wherein s is a variable of a complex frequency domain; ki is a tuning coefficient and can be used for amplitude parameter adjustment of the input signal by the system; omegacIs a frequency bandwidth; omega0Is the fundamental frequency of the input signal.
The fundamental component signal can be selected from the first voltage signal by the R resonator. Wherein, ω is0Can be determined according to the fundamental frequency of the power grid signal, the frequency bandwidth should be greater than or equal to 1.5Hz, the tuning coefficient ki can be selected according to the actual requirement, for example, when the frequency bandwidth is set to 1, the system will divide the fundamental frequency omega0The amplitudes of signals at other frequencies are attenuated. If set to other values greater than 1, the system will attenuate the amplitude of the signal containing the fundamental frequency. In this embodiment, ki may be set to 1, so that amplitude compensation and the like are not required to be subsequently performed on the output fundamental wave signal.
Step S300, mixing the first voltage signal with the fundamental wave signal to obtain a second voltage signal containing a low frequency component.
Then, after obtaining the fundamental wave signal, the first voltage signal is mixed with the fundamental wave component by using the mixing principle in order to obtain the low frequency signal. This is because the first voltage signal includes a fundamental component, and a low-frequency component signal including only a low-frequency can be obtained by frequency-mixing the first voltage signal with a fundamental signal that is a local oscillation signal.
Step S400, performing low-frequency phase locking on the second voltage signal to obtain a phase-locked low-frequency signal.
For the step S400, the second voltage signal is a low-frequency signal output after mixing, and further, the low-frequency signal is subjected to low-frequency phase locking, so as to obtain the phase-locked low-frequency signal. Illustratively, a phase-locked loop may be used for low-frequency phase locking, and the set frequency of the phase-locked loop may be determined according to the frequency of low-frequency components in the grid signal.
The accurate frequency of the low-frequency component can be conveniently and quickly obtained through the steps, and the method is realized by utilizing software in the original hardware system, does not need to increase extra hardware cost, and has better practicability and the like.
As another preferred embodiment, as shown in fig. 2, after step S200, the grid low-frequency locking method further includes:
in step S310, amplitude phase correction is performed on the fundamental wave signal to obtain a corrected fundamental wave signal.
Step S320, the first voltage signal is then mixed with the corrected fundamental wave signal to obtain a second voltage signal containing a low frequency component.
For example, in step S310, amplitude-frequency characteristic analysis may be performed on the obtained fundamental wave signal to obtain a fundamental wave phase difference of the fundamental wave signal. It will be appreciated that the amplitude-to-frequency characteristic is a ratio of amplitude to frequency, and that the amplitude ratio is the ratio of the amplitude of the output signal to the amplitude of the input signal through the system. The fundamental wave signal can be obtained by obtaining the amplitude-frequency characteristics of the fundamental wave signal passing through the R tuner and the like, calculating the phase difference of the fundamental wave signal, and performing amplitude correction and phase correction of the fundamental wave signal using the phase difference to obtain the corrected fundamental wave signal.
Then, amplitude correction and phase correction are carried out on the fundamental wave signal according to the fundamental wave phase difference to obtain a corrected fundamental wave signal. Subsequently, the corrected fundamental wave signal is mixed with the first voltage signal containing the low frequency and the fundamental wave frequency, thereby obtaining a signal containing only the low frequency, i.e., the above-described second voltage signal. Finally, the above step S400 is performed on the obtained second voltage signal.
It can be understood that the fundamental wave amplitude and corresponding error in the power grid signal caused by the selection difference of the tuning coefficient of the R tuner and the like can be corrected by performing amplitude and phase correction on the fundamental wave signal, so that more accurate low-frequency and the like can be obtained. In addition, optionally, the amplitude and phase of the first voltage signal may be corrected according to actual requirements, and the corrected first voltage signal and the corrected fundamental wave signal may be subjected to the above mixing.
In the power grid low-frequency locking method provided by the embodiment, the fundamental frequency selection is realized by adopting a tuner and the like, the selected fundamental component and the voltage signal with the high-frequency component filtered are subjected to frequency mixing to obtain a low-frequency component signal, low-frequency phase locking is performed, and finally the low-frequency component in the power grid voltage signal is obtained. In addition, considering that the R tuner may introduce the fundamental amplitude and corresponding error, the output fundamental component is also subjected to amplitude and phase dynamic correction, so as to obtain a more accurate low-frequency component of the low-frequency. The method is convenient and quick, the steps are realized through software, extra hardware cost is not required to be added, and the practicability is good.
Example 2
Referring to fig. 3, based on the power grid low-frequency locking method in embodiment 1, in this embodiment, a power grid low-frequency locking device 10 is provided, and the device is applied to a wind power converter, and includes:
the high-frequency filtering module 100 is configured to perform high-frequency filtering on the input power grid signal to obtain a first voltage signal with a high-frequency component filtered.
The fundamental frequency selection module 200 is configured to perform fundamental frequency selection on the first voltage signal to obtain a fundamental signal.
A mixing module 300, configured to mix the first voltage signal with the fundamental wave signal to obtain a second voltage signal containing a low frequency component.
And a low-frequency phase-locking module 400, configured to perform low-frequency phase locking on the second voltage signal to obtain a phase-locked low-frequency signal.
Further preferably, as shown in fig. 4, the apparatus further comprises: and the amplitude phase correction module 500 is configured to perform amplitude phase correction on the fundamental wave signal to obtain a corrected fundamental wave signal.
The frequency mixing module 300 is further configured to mix the first voltage signal with the calibration fundamental wave signal, so as to obtain a second voltage signal containing a low frequency component.
It can be understood that the grid low-frequency locking device 10 described above corresponds to the grid low-frequency locking method of embodiment 1. Any of the options in embodiment 1 are also applicable to this embodiment, and will not be described in detail here.
The invention further provides a wind power converter, which comprises a processor and a memory, wherein the memory is used for storing a computer program, and the processor is used for executing the computer program to implement the functions of each module in the power grid low-frequency locking method or the power grid low-frequency locking device.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data (such as voltage data, fundamental wave signal data) created according to the use of the wind power converter, and the like. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The invention also provides a computer storage medium for storing the computer program used in the wind power converter.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (7)
1. A power grid low-frequency locking method is applied to a wind power converter and comprises the following steps:
carrying out high-frequency filtering on an input power grid signal to obtain a first voltage signal with high-frequency components filtered;
carrying out fundamental wave frequency selection on the first voltage signal to obtain a fundamental wave signal;
carrying out amplitude phase correction on the fundamental wave signal to obtain a corrected fundamental wave signal;
mixing the first voltage signal with the correction fundamental wave signal to obtain a second voltage signal containing low-frequency components;
performing low-frequency phase locking on the second voltage signal to obtain a phase-locked low-frequency signal;
and the value of the cut-off frequency of the filter corresponding to the high-frequency filtering is 20-30 times of the fundamental frequency of the power grid signal.
2. The grid low-frequency locking method according to claim 1, wherein the frequency selection bandwidth of the fundamental frequency selection is greater than or equal to 1.5 Hz.
3. The grid low-frequency locking method according to claim 2, wherein the fundamental frequency selection adopts an R resonator, and a transfer function g(s) of the R resonator is as follows:
where s represents a complex variable, ki is a tuning coefficient, ωcIs a frequency bandwidth, omega0Is the fundamental frequency of the input signal.
4. The grid low-frequency locking method according to claim 1, wherein the step of performing amplitude phase correction on the fundamental wave signal to obtain a corrected fundamental wave signal comprises:
performing amplitude-frequency characteristic analysis on the fundamental wave signal to obtain a fundamental wave phase difference;
and carrying out amplitude correction and phase correction on the fundamental wave signal according to the fundamental wave phase difference to obtain a corrected fundamental wave signal.
5. The utility model provides a power grid low frequency locking device which characterized in that is applied to wind-powered electricity generation converter, the device includes:
the high-frequency filtering module is used for performing high-frequency filtering on an input power grid signal to obtain a first voltage signal with high-frequency components filtered out, and the cut-off frequency of a filter corresponding to the high-frequency filtering is 20-30 times of the fundamental frequency of the power grid signal;
the fundamental wave frequency selection module is used for performing fundamental wave frequency selection on the first voltage signal to obtain a fundamental wave signal;
the amplitude phase correction module is used for carrying out amplitude phase correction on the fundamental wave signal to obtain a corrected fundamental wave signal;
the frequency mixing module is used for mixing the first voltage signal with the correction fundamental wave signal to obtain a second voltage signal containing low-frequency components;
and the low-frequency phase locking module is used for carrying out low-frequency phase locking on the second voltage signal to obtain a phase-locked low-frequency signal.
6. Wind power converter, characterized in that it comprises a processor and a memory, said memory being adapted to store a computer program, said processor being adapted to execute said computer program to implement the grid low frequency locking method according to any of claims 1-4.
7. A computer storage medium, characterized in that it stores a computer program which, when executed, implements the grid low frequency locking method according to any one of claims 1-4.
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