CN114421532A - Phase locking method, device and equipment for single-phase power grid inverter and storage medium - Google Patents
Phase locking method, device and equipment for single-phase power grid inverter and 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
- 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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
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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
- 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]
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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
- 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
Abstract
The embodiment of the invention discloses a phase locking method for a single-phase power grid inverter, which comprises the following steps: acquiring a single-phase power grid voltage signal in real time, wherein the single-phase power grid voltage signal is used as a first component; filtering the single-phase power grid voltage signal through a 90-degree phase shift all-pass filter to obtain a second component; combining the reference phase angle, and performing park transformation on the first component and the second component to obtaindqIn a coordinate systemdAxial component sumqAn axial component; according toqThe shaft component and the reference voltage determine a target phase angle. The method comprises the steps of obtaining a single-phase power grid voltage signal in real time, taking the single-phase power grid voltage signal as a first component, filtering the single-phase power grid voltage signal obtained in real time by adopting a 90-degree phase shift all-pass filter to obtain a second component, obtaining the phase angle through the first component and the second component, wherein the phase of the second component is shifted by 90 degrees and the amplitude of the second component is unchanged compared with that of the single-phase power grid voltage signal, and shortening the phase locking period and improving the phase locking periodThe phase locking speed and precision increase the service capacity of the power grid.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a phase locking method, a phase locking device, phase locking equipment and a storage medium for a single-phase power grid inverter.
Background
Under the large background of national 'carbon neutralization' and 'carbon peak-reaching', green energy sources such as wind power, photovoltaic and energy storage are developed vigorously. Under such a large trend, distributed power generation technology has become a hot spot of the technological development of today.
The electric power of the residential electricity is generally a single-phase power grid, the installation amount of a household photovoltaic system and a household energy storage system is increased explosively at present, and the control technology of a single-phase photovoltaic inverter and a single-phase energy storage converter becomes one of the research focuses in the field of new energy. For the system of the single-phase power grid, the most core technology involved is the phase locking technology of the single-phase power grid voltage. However, in the prior art, the phase locking of the single-phase power grid has the problems of low phase locking precision and low speed.
Disclosure of Invention
In view of the above, it is necessary to provide a phase locking method, device, apparatus and storage medium for single-phase grid inverter to solve the above problems
A single-phase grid inverter phase-locking method, comprising:
acquiring a single-phase power grid voltage signal in real time, and taking the single-phase power grid voltage signal as a first component;
filtering the single-phase power grid voltage signal through a 90-degree phase shift all-pass filter to obtain a second component;
combining the reference phase angle, and performing park transformation on the first component and the second component to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
according to the aboveqThe shaft component and the reference voltage determine a target phase angle.
In one embodiment, the 90 ° phase-shifting all-pass filter is configured to shift the phase of the single-phase grid voltage signal by 90 ° with the amplitude remaining unchanged.
In one embodiment, the method is according to theqDetermining the target phase angle from the shaft component and the reference voltage comprises:
inputting the reference phase angle into a PI controller, outputting angular frequency through the PI controller, and integrating the angular frequency to obtain an optimized phase angle;
after the first component and the second component are combined with the optimized phase angle to perform sine and cosine calculationThe values are subjected to park transformation to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
will be described inqAnd after multiplying the shaft component by the reference voltage, inputting the multiplied shaft component to a PI controller, and outputting a target phase angle through the PI controller.
In one embodiment, said integrating said angular frequency comprises: the angular frequency is integrated by a numerically controlled oscillator.
In one embodiment, the PI controller is a loop filter.
In one embodiment, the first component and the second component are subjected to park transformation by combining with a reference phase angle to obtaindqIn a coordinate systemdAxial component sumqAn axial component comprising:
according to the formula:
to obtain thedAxial component sumqAxial component, as follows:
wherein the content of the first and second substances,u g in order to be a single-phase grid voltage signal,u d is composed ofdqIn a coordinate systemdThe axial component of the magnetic flux is,u q is composed ofdqIn a coordinate systemqThe axial component of the magnetic flux is,u α in order to be the first component of the signal,u β in order to be the second component of the signal,θ 1 ’in order to optimize the phase angle,θis the target phase angle.
In one embodiment, the S-domain transfer function of the 90 ° phase-shifted all-pass filter is:
wherein the content of the first and second substances,
the center frequency of the 90 ° phase-shifted all-pass filter.
A single-phase grid inverter phase locking device, comprising:
a component calculation unit for taking the single-phase grid voltage signal as a first component; filtering the single-phase power grid voltage signal through a 90-degree phase shift all-pass filter to obtain a second component;
a park transformation unit for combining the first component and the second component with reference phase angleu β Carrying out park transformation to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
a phase angle calculation unit for calculating a phase angle based on the phase angleqThe shaft component and the reference voltage determine a target phase angle.
A computer device, comprising:
a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of:
acquiring a single-phase power grid voltage signal in real time, and taking the single-phase power grid voltage signal as a first component;
filtering the single-phase power grid voltage signal through a 90-degree phase shift all-pass filter to obtain a second component;
combining the reference phase angle, and performing park transformation on the first component and the second component to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
according to the aboveqThe shaft component and the reference voltage determine a target phase angle.
A computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
acquiring a single-phase power grid voltage signal in real time, and taking the single-phase power grid voltage signal as a first component;
filtering the single-phase power grid voltage signal through a 90-degree phase shift all-pass filter to obtain a second component;
combining the reference phase angle, and performing park transformation on the first component and the second component to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
according to the aboveqThe shaft component and the reference voltage determine a target phase angle.
The embodiment of the invention has the following beneficial effects:
the method comprises the steps of obtaining a single-phase power grid voltage signal in real time, taking the single-phase power grid voltage signal obtained in real time as a first component, filtering the single-phase power grid voltage signal obtained in real time by adopting a 90-degree phase shift all-pass filter to obtain a second component, wherein the phase of the second component is shifted by 90 degrees and the amplitude of the second component is unchanged compared with that of the single-phase power grid voltage signal, and obtaining a phase angle through the first component and the second component.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a system diagram of a phase locking method for a single-phase grid inverter in one embodiment;
FIG. 2 is a phase difference diagram of the grid voltage synthesized vector under different coordinate systems in one embodiment;
FIG. 3 is a schematic diagram of a single-phase grid inverter phase lock in one embodiment;
FIG. 4 is a block diagram of a phase locking device for a single-phase grid inverter according to an embodiment;
FIG. 5 is a block diagram of a computer device in one embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Because the electricity consumed by residents is generally a single-phase power grid, and the voltage phase of the single-phase power grid is tracked, in the prior art, 1/4 power frequency cycles need to be delayed for sampling the voltage of the single-phase power grid to simulate the decomposition voltage of the three-phase power grid on two-phase static alpha axis and beta axis in the Cark conversion, and the method has the defects that a processor needs to store 1/4 sampling values (20 kHz sampling frequency, at least 50 points need to be stored), a large amount of CPU memory resources are occupied, and meanwhile, the problems of low phase locking precision and low speed exist. The present application provides a phase-locking method for a single-phase power grid inverter, aiming at the above technical problems.
Fig. 1 is a system diagram of a phase locking method for a single-phase grid inverter in one embodiment. Referring to fig. 1, the method includes:
s10: real-time acquisition of single-phase grid voltage signalsu g The single-phase grid voltage signal is transmittedu g As a first componentu α ；
S20: applying the single-phase grid voltage signal through a 90 DEG phase-shifted all-pass filteru g Filtering to obtain a second componentu β ；
S30: incorporating reference phase anglesθ 1 For the first componentu α And said second componentu β Carrying out park transformation to obtaindqIn a coordinate systemdAxial componentu d Andqaxial componentu q ；
S40: according to the aboveqAxial componentu q And a reference voltageu* q Determining a target phase angleθ。
The method comprises the steps of obtaining a single-phase power grid voltage signal in real time, taking the single-phase power grid voltage signal obtained in real time as a first component, filtering the single-phase power grid voltage signal obtained in real time by adopting a 90-degree phase shift all-pass filter to obtain a second component, wherein the phase of the second component is shifted by 90 degrees and the amplitude of the second component is unchanged compared with that of the single-phase power grid voltage signal, and obtaining a phase angle through the first component and the second component.
In one embodiment, for the 90 ° phase-shifted all-pass filter in the above step S20, the filter is used for converting the single-phase grid voltage signalu g Is shifted by 90 deg. and the amplitude remains unchanged.
As shown in fig. 2, when the magnitude of the grid voltage is the vector of the grid voltage composition
When the amplitude of (a) is constant, the vector
In park transformationqAxial componentu q Reflect and make a stand ofdAxial and electric vector
The phase relationship of (1). When in use
When the temperature of the water is higher than the set temperature,
shaft lag
When the frequency of the synchronous signal is increased; when in use
，
Axial lead vector
The synchronization signal frequency should be reduced; when in use
When the temperature of the water is higher than the set temperature,
axis and vector
Are superposed, i.e. are
Wherein, in the step (A),
is the vector angle of the grid voltage,
the vector angle of the loop output is also the target phase angle. Thus, can be controlled
The vector angle of the power grid voltage and the vector angle of the loop output are in phase. The specific implementation method is as follows step S30.
In one embodiment, for step S30 above: according to the aboveqAxial componentu q And a reference voltageu* q Determining a target phase angleθ，The method specifically comprises the following steps:
as shown in fig. 3, in which,Cplla loop filter, namely a PI controller; the laplacian 1/s represents an integral calculation, which may be a numerically controlled oscillator,w grid for the angular frequency of the current grid voltageIn the present application, the angular frequency is 100 pi when the grid frequency is 50 Hz. Comparing the reference phase angleθ 1 Inputting to a PI controller, and outputting angular frequency via the PI controllerwAnd angular frequencyw grid Adding to obtain a first angular frequencywFor the first angular frequencywIntegrating to obtain optimized phase angleθ 1 ’；
Then the first component is dividedu α And said second componentu β Incorporating the optimized phase angleθ 1 ’Carrying out park transformation on the values after sine and cosine calculation to obtaindqIn a coordinate systemdAxial componentu d Andqaxial componentu q ；
Will be described inqAxial componentu q And a reference voltageu* q After the multiplication, the phase angle is input to a PI controller, and a target phase angle is output through the PI controllerθ。
On the basis of the above embodiment, the reference phase angle is combinedθ 1 For the first componentu α And said second componentu β Carrying out park transformation to obtaindqIn a coordinate systemdAxial componentu d Andqaxial componentu q Specifically, the method is realized by the following formula:
according to the formula:
to obtain thedAxial componentu d Andqaxial componentu q The following are:
wherein the content of the first and second substances,u g for single-phase mains voltageThe signal(s) is (are) transmitted,u d is composed ofdqIn a coordinate systemdThe axial component of the magnetic flux is,u q is composed ofdqIn a coordinate systemqThe axial component of the magnetic flux is,u α in order to be the first component of the signal,u β in order to be the second component of the signal,θ 1 ’in order to optimize the phase angle,θis the target phase angle.
On the basis of the above embodiment, the S-domain transfer function of the 90 ° phase-shift all-pass filter is:
wherein the content of the first and second substances,
the center frequency of the 90 ° phase-shifted all-pass filter.
Attention is paid tosIs thatsThe expression form of the domain transfer function is not a specific parameter.
Further, the grid voltage signalu g After passing through the all-pass filter, in order to further realize discretization of the transfer function of the all-pass filter, the following formula is combined:
order:
wherein the content of the first and second substances,xrepresenting mains voltage signalsu g ，yRepresenting the second component after passing through an all-pass filteru α ，
For a sampling period, the final difference equation of the all-pass filter is obtained through sorting as follows:
from this final difference equation, an accurate discrete solution is obtained, i.e.
，
As a second componentu α For solving for the target phase angleθIt is essential that a precise second component is obtainedu α Then an accurate target phase angle is obtainedθ。
In particular, a single-phase network voltage signal is passed through a 90 DEG phase-shift all-pass filteru g Filtering to obtain a second componentu β The second componentu β With single-phase mains voltage signalu g In contrast, the phase is shifted by 90 ° and the amplitude is unchanged; i.e. when the single-phase mains voltage signal is present, as shown in figure 2u g Of amplitude, i.e. vector of single-phase network voltage composition
When the magnitude of (a) is constant, the vector
In park transformationqAxial component
Reflect and make a stand ofdAxial and electric vector
The phase relationship of (1). When in use
When the temperature of the water is higher than the set temperature,
shaft lag
When the frequency of the synchronous signal is increased; when in use
，
Axial lead vector
The synchronization signal frequency should be reduced; when in use
When the temperature of the water is higher than the set temperature,
axis and vector
Are superposed, i.e. are
Wherein, in the step (A),
is the vector angle of the grid voltage, i.e. the reference phase angleθ 1 ’；
The vector angle is output by the loop, namely the target phase angle; thus, can be controlled
The vector angle of the power grid voltage and the vector angle of the loop output are in phase, so that the grid voltage and the loop output are in the same phase
Axis and vector
And the phase locking is achieved without increasing or reducing the frequency of the synchronous signal. Then reasoning backwards, that is to say order
And combining the previously obtained first components obtained by the obtainingu α And a second componentu β The first component is passed through a 90 DEG phase-shifted all-pass filteru α And a second componentu β Is shifted by 90 deg. and is constant in amplitude, in which case the target phase angle is obtainedθIn the control process, the vector angle of the grid voltage is controlledθ 1 ’（θ*) With the target phase angleθThe frequency of the single-phase power grid voltage signal is the same as the frequency in the grid-connected inverter system without increasing or reducing the frequency of the synchronous signal, so that the phase locking is achieved.
The present invention also provides a phase-locking device for a single-phase grid inverter, as shown in fig. 4, including:
a component calculation unit 100 for calculating the single-phase grid voltage signalu g As a first componentu α (ii) a Applying the single-phase grid voltage signal through a 90 DEG phase-shifted all-pass filteru g Filtering to obtain a second componentu β ；
A phase angle calculation unit 300 for calculating a phase angle based on the phase angleqAxial componentu q And a reference voltageu* q Determining a target phase angleθ。
The present invention also provides a computer apparatus comprising:
a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of:
s10: real-time acquisition of single-phase grid voltage signalsu g The single-phase grid voltage signal is transmittedu g As a first componentu α ；
S20: applying the single-phase grid voltage signal through a 90 DEG phase-shifted all-pass filteru g Filtering to obtain a second componentu β ；
S30: incorporating reference phase anglesθ 1 For the first componentu α And said second componentu β Carrying out park transformation to obtaindqIn a coordinate systemdAxial componentu d Andqaxial componentu q ；
S40: according to the aboveqAxial componentu q And a reference voltageu* q Determining a target phase angleθ。
As shown in FIG. 5, a diagram illustrating the internal structure of a computer device in one embodiment is shown. The computer device may specifically be a terminal, and may also be a server. As shown in fig. 5, the computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program that, when executed by the processor, causes the processor to implement the age identification method. The internal memory may also have a computer program stored therein, which when executed by the processor, causes the processor to perform the age identification method. Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
The present invention also provides a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
s10: real-time acquisition of single-phase grid voltage signalsu g The single-phase grid voltage signal is transmittedu g As a first componentu α ；
S20: applying the single-phase grid voltage signal through a 90 DEG phase-shifted all-pass filteru g Filtering to obtain a second componentu β ；
S30: incorporating reference phase anglesθ 1 For the first componentu α And said second componentu β Carrying out park transformation to obtaindqIn a coordinate systemdAxial componentu d Andqaxial componentu q ；
S40: according to the aboveqAxial componentu q And a reference voltageu* q Determining a target phase angleθ。
It should be noted that the single-phase grid inverter phase-locking method, the single-phase grid inverter phase-locking device, the computer device and the computer readable storage medium described above belong to a general inventive concept, and the contents in the single-phase grid inverter phase-locking method, the single-phase grid inverter phase-locking device, the computer device and the computer readable storage medium embodiments are applicable to each other.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A phase locking method for a single-phase grid inverter is characterized by comprising the following steps:
acquiring a single-phase power grid voltage signal in real time, and taking the single-phase power grid voltage signal as a first component;
filtering the single-phase power grid voltage signal through a 90-degree phase shift all-pass filter to obtain a second component;
combining the reference phase angle, and performing park transformation on the first component and the second component to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
according to the aboveqThe shaft component and the reference voltage determine a target phase angle.
2. The phase locking method for a single-phase grid inverter according to claim 1,
the 90-degree phase shift all-pass filter is used for shifting the phase of the single-phase power grid voltage signal by 90 degrees, and the amplitude is kept unchanged.
3. The phase locking method for a single-phase grid inverter according to claim 1,
according to the aboveqDetermining the target phase angle from the shaft component and the reference voltage comprises:
inputting the reference phase angle into a PI controller, outputting angular frequency through the PI controller, and integrating the angular frequency to obtain an optimized phase angle;
and performing park transformation on the values of the first component and the second component which are subjected to sine and cosine calculation by combining the optimized phase angle to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
will be described inqAnd after multiplying the shaft component by the reference voltage, inputting the multiplied shaft component to a PI controller, and outputting a target phase angle through the PI controller.
4. The phase locking method for a single-phase grid inverter according to claim 3,
said integrating the angular frequency comprises: the angular frequency is integrated by a numerically controlled oscillator.
5. The single-phase grid inverter phase-locking method according to claim 3, wherein the PI controller is a loop filter.
6. The single-phase grid inverter phase-locking method according to claim 1, wherein the first component and the second component are subjected to phase locking in combination with a reference phase angleLine park transform to obtaindqIn a coordinate systemdAxial component sumqAn axial component comprising:
according to the formula
To obtain thedAxial component sumqAxial component, as follows:
wherein the content of the first and second substances,u g in order to be a single-phase grid voltage signal,u d is composed ofdqIn a coordinate systemdThe axial component of the magnetic flux is,u q is composed ofdqIn a coordinate systemqThe axial component of the magnetic flux is,u α in order to be the first component of the signal,u β in order to be the second component of the signal,θ 1 ’in order to optimize the phase angle,θis the target phase angle.
7. The phase locking method for a single-phase grid inverter according to claim 1,
the S-domain transfer function of the 90 ° phase-shift all-pass filter is:
wherein the content of the first and second substances,
the center frequency of the 90 ° phase-shifted all-pass filter.
8. A single phase grid inverter phase locking device, comprising:
the component calculation unit is used for taking the single-phase power grid voltage signal as a first component; filtering the single-phase power grid voltage signal through a 90-degree phase shift all-pass filter to obtain a second component;
a park transformation unit for combining the first component and the second component with reference phase angleu β Carrying out park transformation to obtaindqIn a coordinate systemdAxial component sumqAn axial component;
a phase angle calculation unit for calculating a phase angle based on the phase angleqThe shaft component and the reference voltage determine a target phase angle.
9. A computer device, comprising:
memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the single phase grid inverter phase locking method of any of claims 1-7.
10. A computer-readable storage medium, storing a computer program that, when executed by a processor, causes the processor to perform the single-phase grid inverter phase locking method of any of claims 1-7.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807918A (en) * | 2010-04-15 | 2010-08-18 | 西安交通大学 | Synchronous coordinate system-based single phase locked loop and implementation method thereof |
| CN102709951A (en) * | 2012-05-26 | 2012-10-03 | 深圳市中兴昆腾有限公司 | Control system and control method of three-phase independent control grid inversion |
| CN103472302A (en) * | 2013-09-16 | 2013-12-25 | 宁夏隆基宁光仪表有限公司 | Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase |
| CN103490772A (en) * | 2013-09-30 | 2014-01-01 | 中船重工鹏力（南京）新能源科技有限公司 | Sliding weighting single-phase soft phase locking method based on reactive compensation |
| CN104917398A (en) * | 2014-03-11 | 2015-09-16 | 沈阳远大电力电子科技有限公司 | Four-quadrant high-voltage frequency converter free from network-side reactor |
-
2022
- 2022-03-30 CN CN202210321031.1A patent/CN114421532A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807918A (en) * | 2010-04-15 | 2010-08-18 | 西安交通大学 | Synchronous coordinate system-based single phase locked loop and implementation method thereof |
| CN102709951A (en) * | 2012-05-26 | 2012-10-03 | 深圳市中兴昆腾有限公司 | Control system and control method of three-phase independent control grid inversion |
| CN103472302A (en) * | 2013-09-16 | 2013-12-25 | 宁夏隆基宁光仪表有限公司 | Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase |
| CN103490772A (en) * | 2013-09-30 | 2014-01-01 | 中船重工鹏力（南京）新能源科技有限公司 | Sliding weighting single-phase soft phase locking method based on reactive compensation |
| CN104917398A (en) * | 2014-03-11 | 2015-09-16 | 沈阳远大电力电子科技有限公司 | Four-quadrant high-voltage frequency converter free from network-side reactor |
Non-Patent Citations (1)
| Title |
|---|
| 孙肖子等编著: "《模拟电子技术基础》", 31 January 2001, pages: 215 * |
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