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CN117034073B - Split-phase power grid type identification method, electronic equipment and storage medium - Google Patents

Split-phase power grid type identification method, electronic equipment and storage medium Download PDF

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CN117034073B
CN117034073B CN202310771186.XA CN202310771186A CN117034073B CN 117034073 B CN117034073 B CN 117034073B CN 202310771186 A CN202310771186 A CN 202310771186A CN 117034073 B CN117034073 B CN 117034073B
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CN117034073A (en
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熊志学
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Shenzhen Megarevo Technology 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/10—Pre-processing; Data cleansing
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
    • G06F18/213—Feature extraction, e.g. by transforming the feature space; Summarisation; Mappings, e.g. subspace methods
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/24—Classification techniques
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin

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  • Theoretical Computer Science (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The application relates to the technical field of converters, and provides a split-phase power grid type identification method, electronic equipment and a storage medium. According to the method, the first path of voltage of the split-phase power grid is subjected to phase locking, the phase angle of the first path of voltage and the sine value and the cosine value of the phase angle are obtained after the phase locking is finished, then the second path of voltage of the split-phase power grid is subjected to 2-order generalized integral transformation, so that the alpha component and the beta component of the second path of voltage are obtained, and after the component of the voltage value of the split-phase power grid on the q axis is obtained through calculation according to the sine value, the cosine value, the alpha component and the beta component, the power grid type of the split-phase power grid can be identified according to the component of the voltage value on the q axis. The application can automatically identify the type of the power grid, thereby improving the grid connection efficiency.

Description

Split-phase power grid type identification method, electronic equipment and storage medium
Technical Field
The present application relates to the field of current transformers, and in particular, to a split phase power grid type identification method, an electronic device, and a storage medium.
Background
The photovoltaic inverter is a heart of a solar photovoltaic power generation system, and is power electronic equipment which is responsible for converting direct current generated by a photovoltaic module into alternating current, transmitting the alternating current to a local load or a power grid and having related protection functions. The domestic and industrial power grids have a phase voltage of 120V, a grid voltage 180 degrees out of phase with each other (120V/240V split phase for short), there is also a grid voltage of 120V for phase voltages, 120 degrees for phase-to-phase errors (abbreviated as 120V/208V split phase).
When supporting the photovoltaic inverter of the two split-phase power grids, the terminal client is generally required to select the power grid type in advance, and the complexity of user operation is increased.
Disclosure of Invention
In view of the above, the application provides a split-phase power grid type identification method, electronic equipment and storage medium, which can automatically identify the power grid type of the split-phase power grid without manual setting by a user, reduce the possibility of setting errors by the user, reduce the complexity of use by the user and improve the user experience.
A first aspect of the present application provides a split-phase power grid type identification method, the method comprising:
Carrying out phase locking on a first path of voltage of a split-phase power grid, and obtaining a phase angle of the first path of voltage and sine and cosine values of the phase angle after phase locking is finished;
2-order generalized integral transformation is carried out on the second path voltage of the split-phase power grid, and an alpha component and a beta component of the second path voltage are obtained;
calculating according to the sine value, the cosine value, the alpha component and the beta component to obtain a component of the voltage value of the split-phase power grid on a q-axis;
and identifying the type of the split-phase power grid according to the component of the voltage value on the q-axis.
In an alternative embodiment, the identifying the grid type of the split phase grid from the component of the voltage value on the q-axis includes:
Judging whether the absolute value of the component of the voltage value on the q axis is smaller than a preset threshold value or not;
when the absolute value of the component of the voltage value on the q-axis is smaller than the preset threshold value, identifying that the power grid type of the split-phase power grid is 120V/240V split-phase power grid;
and when the absolute value of the component of the voltage value on the q axis is larger than the preset threshold value, identifying that the grid type of the split-phase grid is 120V/208V split-phase grid.
In an alternative embodiment, the method further comprises:
And identifying the power grid phase sequence of the 120V/208V split-phase power grid according to the sign of the component of the voltage value on the q axis.
In an alternative embodiment, the identifying the grid phase sequence of the 120V/208V split-phase grid based on the sign of the component of the voltage value on the q-axis comprises:
when the sign of the component of the voltage value on the q axis is positive, identifying the phase sequence of the 120V/208V split-phase power grid as a negative sequence; and when the sign of the component of the voltage value on the q axis is negative, identifying the phase sequence of the 120V/208V split-phase power grid as positive sequence.
In an optional embodiment, calculating the component of the voltage value of the split-phase power grid on the q-axis according to the sine value, the cosine value, the alpha component and the beta component includes:
calculating a first product according to the sine value and the alpha component;
Calculating a second product according to the cosine value and the beta component;
And calculating according to the first product and the second product to obtain the component of the voltage value of the split-phase power grid on the q-axis.
In an alternative embodiment, the phase locking the first path voltage of the split phase power grid includes:
and taking the preset angle position of the first path of voltage as an output angle zero point of a phase-locked loop module, and carrying out phase locking on the first path of voltage of the split-phase power grid.
In an alternative embodiment, the method further comprises:
And when the phase sequence of the power grid with the 120V/208V split-phase power grid is negative, exchanging the first path of voltage with the second path of voltage to ensure that the phase sequence of the power grid with the 120V/208V split-phase power grid is positive.
In an alternative embodiment, before the phase-locking the first path voltage of the split phase power grid, the method further comprises:
Monitoring the working state of the split-phase power grid;
When the split-phase power grid is monitored to recover from an abnormal working state to a normal working state, triggering a power grid voltage phase-locked loop module to start, and calling the power grid voltage phase-locked loop module to carry out phase locking on the first path of voltage of the split-phase power grid.
A second aspect of the application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the split phase grid type identification method when executing the computer program.
A third aspect of the application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the split phase grid type identification method.
According to the split-phase power grid type identification method, the electronic equipment and the storage medium, the first path of voltage of the split-phase power grid is subjected to phase locking, the phase angle of the first path of voltage and the sine value and the cosine value of the phase angle are obtained after the phase locking is finished, the second path of voltage of the split-phase power grid is subjected to 2-order generalized integral transformation, so that the alpha component and the beta component of the second path of voltage are obtained, and after the component of the voltage value of the split-phase power grid on the q-axis is obtained through calculation according to the sine value, the cosine value, the alpha component and the beta component, the power grid type of the split-phase power grid can be identified according to the component of the voltage value on the q-axis. The method and the device can automatically identify the type of the split-phase power grid, improve the grid-connected efficiency, reduce the possibility of user setting errors because manual setting is not needed by users, reduce the complexity of user use and improve the user experience.
Drawings
FIG. 1 is a flow chart of a split phase grid type identification method according to an embodiment of the present application;
FIG. 2 is a waveform diagram of 240V alternating current showing an embodiment of the present application;
FIG. 3 is a waveform diagram of a 208V alternating current shown in an embodiment of the present application;
FIG. 4 is a flow chart of another split phase grid type identification method according to an embodiment of the present application;
fig. 5 is a block diagram of an electronic device shown in an embodiment of the application.
Detailed Description
The terminology used in the following embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates to the contrary. It should also be understood that the term "and/or" as used in this disclosure is intended to encompass any or all possible combinations of one or more of the listed items.
The terms "first," "second," and the like, are used below for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of embodiments of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.
The split-phase power grid type identification method provided by the embodiment of the invention is executed by the electronic equipment.
Fig. 1 is a flowchart of a split-phase power grid type identification method according to an embodiment of the present invention. The split-phase power grid type identification method specifically comprises the following steps, the sequence of the steps in the flow chart can be changed according to different requirements, and some steps can be omitted.
S11, phase locking is carried out on the first path of voltage of the split-phase power grid, and after phase locking is finished, a phase angle of the first path of voltage, and a sine value and a cosine value of the phase angle are obtained.
The split phase inverter can be suitable for various loads so as to meet the requirements of different application scenes, and divides an input alternating current signal into two paths, and the split phase inverter performs inversion after delay respectively as shown in fig. 2 and 3, so that the control and optimization of an output waveform are realized.
The 2-path power grid voltage input of the split-phase inverter is called a first-path voltage and a second-path voltage, wherein the first-path voltage is represented by L1, and the second-path voltage is represented by L2. The mathematical expressions are different for different grid types of grid voltages.
The mathematical expression of the grid voltage of the 120V/240V grid is:
uL1＝Usin(ωt)；
uL2＝Usin(ωt-180°)。
the mathematical expression of the grid voltage at the time of the 120V/208V grid positive sequence is as follows:
uL1＝Usin(ωt)；
uL2＝Usin(ωt-120°)。
The mathematical expression of the grid voltage at the time of 120V/208V grid negative sequence is as follows:
uL1＝Usin(ωt)；
uL2＝Usin(ωt+120°)。
wherein uL1 is an instantaneous value expression of the L1 voltage, uL2 is an instantaneous value expression of the L2 voltage, U is a voltage amplitude, and ω is a grid angular frequency.
As can be seen from the mathematical expression above: for a 120V/240V grid, the L2 voltage lags the L1 voltage by 180 degrees phase angle; for a 120V/208V grid, the L2 voltage lags the L1 voltage by 120 degrees phase angle when the grid phase sequence is positive and the L2 voltage leads the L1 voltage by 120 degrees phase angle when the grid phase sequence is negative.
It should be noted that, in the embodiment of the present application, the power grid voltage is assumed to be an ideal power grid voltage, and no harmonic and distortion are considered.
In an alternative embodiment, before the phase-locking the first path voltage of the split phase power grid, the method further comprises:
Monitoring the working state of the split-phase power grid;
When the split-phase power grid is monitored to recover from an abnormal working state to a normal working state, triggering a power grid voltage phase-locked loop module to start, and calling the power grid voltage phase-locked loop module to carry out phase locking on the first path of voltage of the split-phase power grid.
In practical application, due to unreasonable power grid line structure, large power grid line load change, power grid line wiring error and other reasons, abnormal power grid phase can occur (namely, the phase difference between phase voltages exceeds the normal range), so that the problems of power grid stability reduction, large power grid voltage fluctuation, poor power grid line contact, power grid line thermal faults and the like can be caused. Therefore, it is necessary to monitor the operation state of the split phase power grid in real time. The working states comprise an abnormal working state and a normal working state. How to judge whether the broken phase power grid is in an abnormal working state or a normal working state is not an application point of the present application and is not described in detail herein.
And triggering the automatic power grid identification module when the phase splitting power grid is restored to the normal working state from the abnormal working state every time. After the automatic power grid identification module is started, a power grid voltage Phase Lock Loop (PLL) module is called to lock the Phase of the L1 voltage, so that the Phase angle of the L1 voltage is obtained, and the sine value and the cosine value based on the Phase angle are obtained.
A phase locked loop is a negative feedback control system that uses a voltage generated by phase synchronization to detune a voltage controlled oscillator to generate a target frequency. The commonly used phase locking methods can be divided into two main categories, hardware phase locking and software phase locking. The hardware phase lock calculates the period value of the power grid voltage by judging the zero crossing point of the power grid voltage, thereby calculating the frequency and the phase of the power grid voltage. The software phase lock captures the phase and frequency of the voltage by converting the input voltage through Park to dq two-phase rotating coordinate system, and adjusting the q-axis or d-axis component to zero through the PI controller. The method of software phase locking may include: a phase locking method based on hardware zero crossing signal, a phase locking method based on Hilbert transform and a phase locking method based on 2-order generalized integral (Second Order Generalized Integrator, SOGI).
In an alternative embodiment, the phase locking the first path voltage of the split phase power grid includes:
and taking the preset angle position of the first path of voltage as an output angle zero point of a phase-locked loop module, and carrying out phase locking on the first path of voltage of the split-phase power grid.
According to the embodiment of the application, the preset angle position of the L1 voltage, for example, the 90-degree position is used as the output angle zero point of the power grid voltage phase-locked loop module, so that the phase locking of the first path voltage of the split-phase power grid is completed.
And after phase locking is finished, acquiring the phase angle of the first path of voltage and the sine value and the cosine value of the phase angle.
After the phase of the L1 voltage is locked, the mathematical expression of the sine value and the cosine value of the phase angle is respectively as follows:
θPLL＝ωt-90°；
sin(θPLL)＝sin(ωt-90°)＝-cos(ωt)；
cos(θPLL)＝cos(ωt-90°)＝sin(ωt)；
Where θ PLL denotes a phase angle after the LI voltage phase locking, sin (θ PLL) denotes a sine value of the phase angle after the LI voltage phase locking, and cos (θ PLL) denotes a cosine value of the phase angle after the LI voltage phase locking.
And S12, performing 2-order generalized integral transformation on the second path of voltage of the split-phase power grid to obtain an alpha component and a beta component of the second path of voltage.
After phase locking of the L1 voltage of the split-phase power grid is completed, the L2 voltage may be transformed using a generalized integral of 2 (Second Order Generalized Integral, SOGI) to obtain an alpha component and a beta component of the L2 voltage. Wherein the alpha component is the L2 voltage itself and the beta component is the value of 90 degrees after the L2 voltage.
For a 120V/240V grid, the mathematical expressions for the alpha and beta components of the L2 voltage are: ul2_alpha=ul2= Usin (ωt-180 °) = -Usin (ωt);
uL2_beta＝Usin(ωt-270°)＝Ucos(ωt)。
For a 120V/208V power grid, when the phase sequence of the power grid is positive sequence, the mathematical expressions of the alpha component and the beta component of the L2 voltage are respectively as follows:
uL2_alpha＝uL2＝Usin(ωt-120°)；
uL2_beta＝Usin(ωt-210°)。
for a 120V/208V power grid, when the phase sequence of the power grid is negative sequence, the mathematical expressions of the alpha component and the beta component of the L2 voltage are respectively as follows:
uL2_alpha＝uL2＝Usin(ωt+120°)；
uL2_beta＝Usin(ωt+30°)。
And S13, calculating the component of the voltage value of the split-phase power grid on the q axis according to the sine value, the cosine value, the alpha component and the beta component.
The mathematical calculation model of the components of the voltage value of the split-phase power grid on the q-axis can be preset, after the sine value and the cosine value of the phase angle after the phase locking of the first path of voltage and the alpha component and the beta component after the 2-order generalized integral transformation of the second path of voltage are obtained through calculation, the sine value, the cosine value, the alpha component and the beta component can be input into the mathematical calculation model of the components of the voltage value of the split-phase power grid on the q-axis, and therefore the components of the voltage value of the split-phase power grid on the q-axis can be obtained through calculation.
In some embodiments, a first product of the sine value and the alpha component may be calculated, a second product of the cosine value and the beta component may be calculated, and a sum of the first product and the second product may be calculated, so as to obtain a component of the voltage value of the split phase power grid on the q axis.
Illustratively, the mathematical calculation model of the components of the voltage values of the split phase grid on the q-axis is as follows: vq= -uL2_alpha sin (θ PLL)+uL2_beta*cos(θPLL).
S14, identifying the grid type of the split-phase grid according to the component of the voltage value on the q-axis.
After the voltage value of the split-phase power grid is calculated, the type of the split-phase power grid connected to the power grid can be identified according to the component of the voltage value on the q-axis.
In an alternative embodiment, the identifying the grid type of the split phase grid from the component of the voltage value on the q-axis includes:
Judging whether the absolute value of the component of the voltage value on the q axis is smaller than a preset threshold value or not;
when the absolute value of the component of the voltage value on the q-axis is smaller than the preset threshold value, identifying that the power grid type of the split-phase power grid is 120V/240V split-phase power grid;
and when the absolute value of the component of the voltage value on the q axis is larger than the preset threshold value, identifying that the grid type of the split-phase grid is 120V/208V split-phase grid.
The preset threshold is a preset critical value for judging the type of the broken-phase power grid. The preset threshold may be set to a voltage amplitude of 0.2 times, for example.
Because the component of the voltage value of the split-phase power grid on the q-axis can be positive or negative, and can also be 0, in order to facilitate rapid identification of the power grid type of the split-phase power grid, the absolute value of the component of the voltage value of the split-phase power grid on the q-axis can be calculated first, and whether the split-phase power grid is connected with the power grid of 120V/240V or the power grid of 120V/208V can be judged according to the absolute value.
In an alternative embodiment, the method further comprises:
And identifying the power grid phase sequence of the 120V/208V split-phase power grid according to the sign of the component of the voltage value on the q axis.
For a 120V/208V grid, the grid phase sequence is divided into positive sequence and negative sequence, so when the split-phase grid is identified as the 120V/208V grid according to the absolute value of the component of the voltage value on the q axis, the grid phase sequence of the 120V/208V split-phase grid can be further identified according to the sign of the component of the voltage value on the q axis.
Specifically, when the sign of the component of the voltage value on the q axis is positive, identifying the phase sequence of the 120V/208V split-phase power grid as a negative sequence; and when the sign of the component of the voltage value on the q axis is negative, identifying the phase sequence of the 120V/208V split-phase power grid as positive sequence.
The following describes the technical principle of identifying the grid type and the grid phase sequence of the split-phase grid according to the components of the voltage value on the q-axis:
When the access power grid is a 120V/240V split-phase power grid with L2 voltage lagging behind L1 voltage by 180 degrees, the components of the voltage value of the split-phase power grid on the q axis are as follows:
Vq＝-uL2_alpha*sin(θPLL)+uL2_beta*cos(θPLL)＝Usin(ωt)*(-cos(ωt))+Ucos(ωt)*sin(ωt)＝0。
When the access power grid is a 120V/208V split-phase power grid with L2 voltage lagging behind L1 voltage by 120 degrees, namely, when the access power grid is a 120V/208V positive sequence split-phase power grid, the components of the voltage value of the split-phase power grid on the q axis are as follows:
Vq＝-uL2_alpha*sin(θPLL)+uL2_beta*cos(θPLL)＝-Usin(ωt-120°)*(-cos(ωt))+Usin(ωt-210°))*sin(ωt)＝-0.866U.
When the connected power grid is a 120V/208V split-phase power grid with L2 voltage advanced by 120 degrees relative to L1 voltage, namely, when the connected power grid is a 120V/208V negative sequence split-phase power grid, the components of the voltage value of the split-phase power grid on the q axis are as follows:
Vq＝-uL2_alpha*sin(θPLL)+uL2_beta*cos(θPLL)＝-Usin(ωt+120°)*(-cos(ωt))+Usin(ωt+30°))*sin(ωt)＝0.866U。
It follows that for a 120V/240V split phase grid, the component of the voltage value on the q-axis is 0. For a 120V/208V split-phase grid, and the grid phase sequence is positive, the component of the voltage value on the q-axis is a constant negative value. And for a 120V/208V split-phase power grid, and the power grid phase sequence is positive, the component of the voltage value on the q axis is a constant positive value. Thus, the grid type and the grid phase sequence (the voltage phase sequence of L1, L2) of the split-phase grid can be identified by the magnitude and sign of the component Vq of the voltage value of the split-phase grid on the q-axis.
In an alternative embodiment, the method further comprises:
And when the phase sequence of the power grid with the 120V/208V split-phase power grid is negative, exchanging the first path of voltage with the second path of voltage to ensure that the phase sequence of the power grid with the 120V/208V split-phase power grid is positive.
When the component of the current voltage value on the q axis is recognized as a negative value, the phase sequence of the power grid of the split-phase power grid is positive, and operation is not needed. When the component of the current voltage value on the q axis is identified to be positive, the phase sequence of the split-phase power grid is indicated to be negative, and the split-phase power grid needs to be repaired. For example, the grid phase sequence may be made positive by exchanging the first voltage with the second voltage.
The application can automatically identify the type and the phase sequence of the power grid, thereby being capable of adaptively adjusting the internal control mode according to the actual phase sequence of the power grid, ensuring that the inverter can work normally in a grid connection under the condition of any phase sequence access of the power grid, greatly improving the grid connection efficiency, improving the power grid adaptation capability of the inverter, reducing unnecessary work on site and saving the time and cost for site installation and debugging.
Fig. 4 is a flowchart of a split-phase power grid type identification method according to a second embodiment of the present invention. The split-phase power grid type identification method specifically comprises the following steps, the sequence of the steps in the flow chart can be changed according to different requirements, and some steps can be omitted.
S41, judging whether phase locking of the first path of voltage of the split-phase power grid is finished or not.
And after phase locking is finished, acquiring the phase angle of the first path of voltage and the sine value and the cosine value of the phase angle.
After the phase locking of the first path of voltage of the split-phase power grid is completed, S42 is executed; when the phase lock of the first path voltage of the split-phase power grid is not completed, S43 is executed.
S42, performing 2-order generalized integral transformation on the second path voltage of the split-phase power grid to obtain an alpha component and a beta component of the second path voltage.
S43, waiting until phase locking of the first path voltage of the split-phase power grid is completed.
S44, calculating the component of the voltage value of the split-phase power grid on the q axis according to the sine value, the cosine value, the alpha component and the beta component.
S45, judging whether the absolute value of the component of the voltage value on the q axis is smaller than a preset threshold value.
When the absolute value of the component of the voltage value on the q-axis is smaller than a preset threshold, S46 is performed; when the absolute value of the component of the voltage value on the q-axis is not less than the preset threshold, S47 is performed.
S46, identifying as 120V/240V split-phase power grid.
S47, judging whether the sign of the component of the voltage value on the q axis is positive or not.
When the sign of the component of the voltage value on the q-axis is positive, performing S48; when the sign of the component of the voltage value on the q-axis is negative, S49 is performed.
S48, identifying a 120V/208V split-phase power grid and enabling the power grid phase sequence to be negative.
S49, identifying a 120V/208V split-phase power grid and enabling the phase sequence of the power grid to be positive.
The detailed process is shown in fig. 1 and the related description thereof, and the present invention will not be described in detail herein.
Fig. 5 is a schematic structural diagram of an electronic device according to a third embodiment of the present invention. In a preferred embodiment of the invention, the electronic device 5 comprises a memory 51, at least one processor 52, at least one communication bus 53.
It will be appreciated by those skilled in the art that the configuration of the electronic device shown in fig. 5 is not limiting of the embodiments of the present invention, and that either a bus-type configuration or a star-type configuration may be used, and that the electronic device 5 may include more or less other hardware or software than that shown, or a different arrangement of components.
In some embodiments, the electronic device 5 is a device capable of automatically performing numerical calculation and/or information processing according to a preset or stored instruction, and its hardware includes, but is not limited to, a microprocessor, an application specific integrated circuit, a programmable gate array, a digital processor, an embedded device, and the like. The electronic device 5 may also include a client device, which includes, but is not limited to, any electronic product that can interact with a client by way of a keyboard, mouse, remote control, touch pad, or voice control device, such as a personal computer, tablet, smart phone, digital camera, etc.
It should be noted that the electronic device 5 is only used as an example, and other electronic products that may be present in the present invention or may be present in the future are also included in the scope of the present invention by way of reference.
In some embodiments, the memory 51 has stored therein a computer program which, when executed by the at least one processor 52, implements all or part of the steps of the split phase grid type identification method as described. The Memory 51 includes Read-Only Memory (ROM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable rewritable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic tape Memory, or any other medium that can be used for carrying or storing data. Further, the computer-readable storage medium may mainly 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, and the like.
In some embodiments, the at least one processor 52 is a Control Unit (Control Unit) of the computer device 5, connects the various components of the entire electronic device 5 using various interfaces and lines, and performs various functions of the electronic device 5 and processes data by running or executing programs or modules stored in the memory 51, and invoking data stored in the memory 51. For example, the at least one processor 52, when executing the computer program stored in the memory, implements all or part of the steps of the split phase grid type identification method described in embodiments of the present invention; or to implement all or part of the functionality of the split phase grid type identification device. The at least one processor 52 may be comprised of integrated circuits, such as a single packaged integrated circuit, or may be comprised of multiple integrated circuits packaged with the same or different functionality, including one or more central processing units (Central Processing unit, CPU), microprocessors, digital processing chips, graphics processors, combinations of various control chips, and the like.
In some embodiments, the at least one communication bus 53 is arranged to enable connected communication between the memory 51 and the at least one processor 52 or the like. Although not shown, the electronic device 5 may further include a power source (such as a battery) for powering the various components, and preferably the power source may be logically connected to the at least one processor 52 via a power management device, such that functions of managing charging, discharging, and power consumption are performed by the power management device. The power supply may also include one or more of any of a direct current or alternating current power supply, recharging device, power failure detection circuit, power converter or inverter, power status indicator, etc. The electronic device 5 may further include various sensors, bluetooth modules, wi-Fi modules, etc., which will not be described herein.
The integrated units implemented in the form of software functional modules described above may be stored in a computer readable storage medium. The software functional modules described above are stored in a storage medium and include instructions for causing an electronic device (which may be a personal computer, an electronic device, or a network device, etc.) or a processor (processor) to perform portions of the methods described in the various embodiments of the invention.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be other manners of division when actually implemented.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Claims (8)

1. A split-phase grid type identification method, the method comprising:
Carrying out phase locking on a first path of voltage of a split-phase power grid, and obtaining a phase angle of the first path of voltage and sine and cosine values of the phase angle after phase locking is finished;
2-order generalized integral transformation is carried out on the second path voltage of the split-phase power grid, and an alpha component and a beta component of the second path voltage are obtained;
And calculating the component of the voltage value of the split-phase power grid on the q-axis according to the sine value, the cosine value, the alpha component and the beta component, wherein the component comprises the following components: calculating a first product according to the sine value and the alpha component; calculating a second product according to the cosine value and the beta component; calculating according to the first product and the second product to obtain a component of the voltage value of the split-phase power grid on a q-axis;
Identifying a grid type of the split phase grid from the component of the voltage value on the q-axis, comprising: judging whether the absolute value of the component of the voltage value on the q axis is smaller than a preset threshold value or not; when the absolute value of the component of the voltage value on the q-axis is smaller than the preset threshold value, identifying that the power grid type of the split-phase power grid is 120V/240V split-phase power grid; and when the absolute value of the component of the voltage value on the q axis is larger than the preset threshold value, identifying that the grid type of the split-phase grid is 120V/208V split-phase grid.
2. The split-phase grid type identification method of claim 1, further comprising:
And identifying the power grid phase sequence of the 120V/208V split-phase power grid according to the sign of the component of the voltage value on the q axis.
3. The split-phase grid type identification method according to claim 2, wherein the identifying the grid phase sequence of the 120V/208V split-phase grid from the sign of the component of the voltage value on the q-axis comprises:
when the sign of the component of the voltage value on the q axis is positive, identifying the phase sequence of the 120V/208V split-phase power grid as a negative sequence; and when the sign of the component of the voltage value on the q axis is negative, identifying the phase sequence of the 120V/208V split-phase power grid as positive sequence.
4. The split-phase power grid type identification method according to claim 1, wherein phase-locking the first path voltage of the split-phase power grid comprises:
and taking the preset angle position of the first path of voltage as an output angle zero point of a phase-locked loop module, and carrying out phase locking on the first path of voltage of the split-phase power grid.
5. The split-phase grid type identification method of claim 4, further comprising:
And when the phase sequence of the power grid with the 120V/208V split-phase power grid is negative, exchanging the first path of voltage with the second path of voltage to ensure that the phase sequence of the power grid with the 120V/208V split-phase power grid is positive.
6. The split-phase grid type identification method of claim 4, wherein prior to said phase locking the first path voltage of the split-phase grid, the method further comprises:
Monitoring the working state of the split-phase power grid;
When the split-phase power grid is monitored to recover from an abnormal working state to a normal working state, triggering a power grid voltage phase-locked loop module to start, and calling the power grid voltage phase-locked loop module to carry out phase locking on the first path of voltage of the split-phase power grid.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the split phase grid type identification method according to any one of claims 1 to 6 when the computer program is executed.
8. 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 split-phase grid type identification method according to any one of claims 1 to 6.
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