CN116885964A - Control method and device of photovoltaic inverter, electronic device and storage medium - Google Patents

Control method and device of photovoltaic inverter, electronic device and storage medium Download PDF

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Publication number
CN116885964A
CN116885964A CN202311145404.5A CN202311145404A CN116885964A CN 116885964 A CN116885964 A CN 116885964A CN 202311145404 A CN202311145404 A CN 202311145404A CN 116885964 A CN116885964 A CN 116885964A
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China
Prior art keywords
voltage
pulse signal
output
current voltage
direct
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CN202311145404.5A
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Chinese (zh)
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CN116885964B (en
Inventor
魏齐良
陈武斌
山海峰
刘超
周智
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Zhejiang Huayuxin Technology Co ltd
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Zhejiang Huayuxin Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The application relates to a control method, a device, an electronic device and a storage medium of a photovoltaic inverter, wherein the control method of the photovoltaic inverter comprises the following steps: after the auxiliary power supply module is started, obtaining direct-current voltage output by the photovoltaic module; if the voltage is stable based on the direct-current voltage, outputting a pulse signal so that the pulse signal consumes the direct-current voltage of the photovoltaic module; and if the voltage stability is determined based on the direct-current voltage after the pulse signal is output, controlling the photovoltaic inverter to output electric energy to a power grid. According to the application, the problem of equipment burnout caused by unstable power supply of the photovoltaic module in a weak light state is solved, and the operation stability of the photovoltaic inverter is ensured.

Description

Control method and device of photovoltaic inverter, electronic device and storage medium
Technical Field
The present application relates to the field of photovoltaic inverters, and in particular, to a control method, a device, an electronic device, and a storage medium for a photovoltaic inverter.
Background
A photovoltaic inverter is a power adjustment device composed of semiconductor devices, which is applied to a photovoltaic solar power generation system, and is a device for converting direct current output by a solar panel in the photovoltaic solar power generation system into alternating current and outputting the alternating current to an alternating current load.
The photovoltaic inverter generally includes an inverter circuit, a control module, a relay, and an auxiliary power supply for supplying power to the control module. When the sunlight is weak, such as in the morning and evening, cloudiness, and the like, the output power of the photovoltaic module is low, but the open-circuit voltage is still high, and the open-circuit voltage is always higher than the lowest input starting voltage of the photovoltaic inverter. The switching on and switching off process is usually repeated for a plurality of times under the condition of weak light, so that electrical components in the photovoltaic inverter are easily burnt.
Aiming at the problem of equipment burnout caused by unstable power supply of a photovoltaic module in a weak light state in the related art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment provides a control method, a control device, an electronic device and a storage medium of a photovoltaic inverter, so as to solve the problem of equipment burnout caused by unstable power supply of a photovoltaic module in a weak light state in the related technology.
In a first aspect, in this embodiment, there is provided a control method of a photovoltaic inverter, the method including:
after the auxiliary power supply module is started, obtaining direct-current voltage output by the photovoltaic module;
if the voltage stability is determined based on the direct-current voltage, outputting a pulse signal so that the pulse signal consumes the direct-current voltage of the photovoltaic module;
and if the voltage stability is determined based on the direct-current voltage after the pulse signal is output, controlling the photovoltaic inverter to output electric energy to a power grid.
In some of these embodiments, the outputting the pulse signal if the voltage is determined to be stable based on the dc voltage includes:
if the direct current voltage is continuously greater than a first preset voltage threshold value within a first preset time period, the voltage of the photovoltaic module is stable, and a relay in the photovoltaic inverter is controlled to be closed;
acquiring the direct-current voltage of the relay after being closed;
and if the direct current voltage after the relay is closed is continuously greater than the first preset voltage threshold value within the first preset time period, outputting a first pulse signal, wherein the pulse signal comprises the first pulse signal.
In some of these embodiments, the method further comprises:
if the direct current voltage after the relay is closed is not continuously greater than the first preset voltage threshold value within the first preset time period, the relay is disconnected;
and determining the direct-current voltage output by the photovoltaic module again until the voltage of the photovoltaic module is stable, and controlling the relay to be closed.
In some embodiments, the pulse signal further includes a second pulse signal, and if it is determined that the voltage is stable based on the dc voltage after the pulse signal is output, the controlling the photovoltaic inverter to output the electric energy to the electric grid includes:
after the first pulse signal is obtained and output, the first direct-current voltage output by the photovoltaic module is obtained;
outputting a second pulse signal if the voltage is stable based on the first direct current voltage, wherein the frequency of the second pulse signal is greater than that of the first pulse signal;
after the second pulse signal is obtained and output, the second direct-current voltage output by the photovoltaic module is obtained;
and if the voltage stability is determined based on the second direct-current voltage, controlling the photovoltaic inverter to output electric energy to the power grid.
In some embodiments, if it is determined that the voltage is stable based on the first direct current voltage, outputting a second pulse signal includes:
If the first direct current voltage is continuously greater than a second preset voltage threshold value within a second preset time period, the voltage is stable, and a second pulse signal is output;
if the first direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the first pulse signal is stopped, and the first pulse signal is output after the voltage is stable.
In some of these embodiments, the controlling the photovoltaic inverter to output electrical energy to the grid if voltage stabilization is determined based on the second dc voltage includes:
if the second direct current voltage is continuously greater than a second preset voltage threshold value within a second preset time period, the voltage is stable, and the photovoltaic inverter is controlled to output electric energy to the power grid;
if the second direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the second pulse signal is stopped until the voltage is stable, and the first pulse signal is output.
In some of these embodiments, the second preset duration is less than the first preset duration.
In a second aspect, in this embodiment, there is provided a control device for a photovoltaic inverter, the device including:
the acquisition module is used for acquiring the direct-current voltage output by the photovoltaic module after the auxiliary power supply module is started;
the pulse signal output module is used for outputting a pulse signal if the voltage is stable based on the direct-current voltage, so that the pulse signal consumes the direct-current voltage of the photovoltaic module;
and the control module is used for controlling the photovoltaic inverter to output electric energy to the power grid if the voltage stability is determined based on the direct-current voltage after the pulse signal is output.
In a third aspect, in this embodiment, there is provided an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the control method of the photovoltaic inverter described in the first aspect when executing the computer program.
In a fourth aspect, in the present embodiment, there is provided a storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of the photovoltaic inverter described in the first aspect.
Compared with the prior art, the method has the advantages that after the auxiliary power supply module is started, the direct-current voltage output by the photovoltaic module is obtained, and the pulse signal is output after the direct-current voltage is stabilized, so that the direct-current voltage output by the photovoltaic module is consumed through the pulse signal, the direct-current voltage required by normal operation of an electrical element in the inversion module can be detected before the inversion module operates, the photovoltaic inverter is controlled to output electric energy to the power grid after the direct-current voltage after the pulse signal is output is stabilized, the problem that equipment burns due to unstable power supply of the photovoltaic module can be effectively avoided, the photovoltaic inverter is controlled to output electric energy to the power grid after the power supply of the photovoltaic module is stabilized, and the operation stability of the photovoltaic inverter is ensured.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic structural diagram of a photovoltaic inverter provided in an embodiment of the present application;
fig. 2 is a flowchart of a control method of a photovoltaic inverter according to an embodiment of the present application;
fig. 3 is a flowchart of an embodiment of a control method of a photovoltaic inverter according to an embodiment of the present application;
fig. 4 is a block diagram of a control device of a photovoltaic inverter according to an embodiment of the present application;
fig. 5 is an internal structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The present application will be described and illustrated with reference to the accompanying drawings and examples for a clearer understanding of the objects, technical solutions and advantages of the present application.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these" and similar terms in this application are not intended to be limiting in number, but may be singular or plural. The terms "comprising," "including," "having," and any variations thereof, as used herein, are intended to encompass non-exclusive inclusion; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (units) is not limited to the list of steps or modules (units), but may include other steps or modules (units) not listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this disclosure are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. Typically, the character "/" indicates that the associated object is an "or" relationship. The terms "first," "second," "third," and the like, as referred to in this disclosure, merely distinguish similar objects and do not represent a particular ordering for objects.
Fig. 1 is a schematic structural diagram of a photovoltaic inverter provided in the embodiment of the present application, as shown in fig. 1, a photovoltaic module 110 is connected to the photovoltaic inverter 120, the photovoltaic inverter 120 includes an auxiliary power supply module 121, an input capacitor 122, an inverter module 123, a control module 124 and a relay 125, where the control module 124 includes a control unit 10 and a pulse signal generating unit 20, the pulse signal generating unit 20 may be a pulse signal generator, the inverter module 123 is connected to the photovoltaic module 110 through the input capacitor 122, the inverter module 123 is used to invert dc power provided by the photovoltaic module 110 into ac power, the relay 125 is connected to the inverter module 123 and the power grid 130, to control connection of the inverter module 123 to the power grid 130, the control unit 10 is connected to the inverter module 123 and the relay 125, to control an operation state of the inverter module 123, the auxiliary power supply module 121 is connected to the photovoltaic module 110, to supply power to the control module 124 according to a dc voltage output by the photovoltaic module 110, the control unit 10 is further connected to the pulse signal generating unit 20, to control the pulse signal generating unit 20 to output a pulse signal, the voltage step-down module 123 includes a two-down diode and a voltage transformer element, and the like.
It should be noted that the photovoltaic inverter in the embodiment of the present application may be a flyback inverter, or may be another type of inverter, which is not limited herein.
The control method of the photovoltaic inverter provided by the application can be applied to the control unit of the control module of the photovoltaic inverter shown in fig. 1, fig. 2 is a flowchart of the control method of the photovoltaic inverter according to the embodiment of the application, and the execution subject of the method can be an electronic device, optionally, the electronic device can be the control unit, but the application is not limited thereto. Specifically, as shown in fig. 2, the process includes the following steps:
step S201, after the auxiliary power module is turned on, the dc voltage output by the photovoltaic module is obtained.
When the photovoltaic module receives illumination, electric energy is generated, the generated electric energy is transmitted to the input capacitor and the auxiliary power supply module, and the auxiliary power supply module is started and stores direct-current voltage through the input capacitor.
Further, after the auxiliary power supply module is started, the control unit may obtain the dc voltage output by the photovoltaic module, and it should be noted that, in the embodiment of the present application, the dc voltage output by the photovoltaic module may refer to the voltage stored on the input capacitor.
In step S202, if the voltage is stable based on the dc voltage, a pulse signal is output.
And then the direct-current voltage of the photovoltaic module can be consumed through the pulse signal.
Further, the stability of the direct current voltage output by the photovoltaic module can be determined through the direct current voltage of the photovoltaic module, and when the direct current voltage output by the photovoltaic module is stable, the control unit can control the pulse signal generating unit to output a pulse signal.
In step S203, if it is determined that the voltage is stable based on the dc voltage after the pulse signal is output, the photovoltaic inverter is controlled to output electric energy to the power grid.
Further, after the pulse signal is output, the control unit can also acquire the direct current voltage stored on the input capacitor after the pulse signal is output, determine the stability of the direct current voltage, and if the direct current voltage stored on the input capacitor is stable after the pulse signal is output, control the photovoltaic inverter to output electric energy to the power grid.
It should be noted that, the power grid may refer to electric equipment powered by the photovoltaic inverter.
In the implementation process, after the auxiliary power supply module is started, the direct-current voltage output by the photovoltaic module is obtained, and the pulse signal is output after the direct-current voltage is stabilized, so that the direct-current voltage output by the photovoltaic module is consumed through the pulse signal, the direct-current voltage required by normal operation of an electrical element in the inversion module can be detected before the inversion module operates, and further, after the direct-current voltage after the pulse signal is output is stabilized, the photovoltaic inverter is controlled to output electric energy to a power grid, the problem that equipment burns out due to unstable power supply of the photovoltaic module can be effectively avoided, the photovoltaic inverter is controlled to output electric energy to the power grid after the power supply of the photovoltaic module is stabilized, and the operation stability of the photovoltaic inverter is ensured.
In some embodiments, if the voltage is determined to be stable based on the dc voltage, outputting the pulse signal may include the steps of:
step 1: if the direct current voltage is continuously larger than a first preset voltage threshold value within a first preset time period, the voltage of the photovoltaic module is stable, and a relay in the photovoltaic inverter is controlled to be closed.
Step 2: and acquiring the direct-current voltage after the relay is closed.
Step 3: if the direct current voltage after the relay is closed is continuously greater than a first preset voltage threshold value within a first preset time period, outputting a first pulse signal, wherein the pulse signal comprises the first pulse signal.
The method includes that the direct current voltage in the input capacitor can be monitored, if the direct current voltage is continuously larger than a first preset voltage threshold value within a first preset time period, the voltage stability of the photovoltaic module can be determined, and then the control unit can control the relay to be closed, at the moment, only the relay is closed, the photovoltaic inverter does not output electric energy to the power grid, the direct current voltage after the relay is closed is obtained, and the direct current voltage is the direct current voltage on the input capacitor after the relay is closed.
Specifically, the first preset duration may be 30S, or may be 50S, or may be adaptively set according to actual situations, which is not limited herein. The first preset voltage threshold may be 15V, or may be 20V, or may be another voltage threshold, which is not limited herein.
If the direct current voltage after the relay is closed is continuously larger than the first preset voltage threshold value within the first preset time, the voltage after the relay is closed is stable, and the pulse signal generating unit can be controlled to output a first pulse signal.
Specifically, when the voltage after the relay is closed is stable, the voltage consumed by the relay in the working process can be stably maintained by the direct-current voltage of the photovoltaic module, and the pulse signal generating unit is controlled to output a first pulse signal after the direct-current voltage at the moment is stable, so that the power supply stability of the photovoltaic module in the operation process of the follow-up inverter can be conveniently tested through the first pulse signal.
In the implementation process, the relay is closed after the obtained direct-current voltage is stabilized, so that the normal operation of the auxiliary power supply module and the control module inside the photovoltaic inverter can be stably maintained by the current direct-current voltage, the relay is closed at the moment, whether the normal operation of the relay is stably maintained by the current direct-current voltage is conveniently determined, and a first pulse signal is output after the normal operation of the auxiliary power supply module, the control module and the relay is maintained by the current direct-current voltage, so that the detection on whether the integral operation of the inversion module is maintained by the current direct-current voltage is facilitated.
In some embodiments, if the dc voltage after the relay is closed is greater than the first preset voltage threshold for a first preset period of time, the method may further include:
Step 1: pulse signals with different frequencies are respectively output in a plurality of continuous preset time periods, each preset time period corresponds to a pulse signal with one frequency, the frequency of the pulse signal is positively correlated with the sequence number of the preset time period, and the sequence number of the preset time period is generated based on the time sequence of the plurality of continuous preset time periods.
Step 2: after each pulse signal is output, determining the direct current voltage output by the photovoltaic module, and when the direct current voltage output by the photovoltaic module is stable in a corresponding preset time period, outputting the next pulse signal until the corresponding direct current voltage in a plurality of continuous preset time periods is stable, controlling the photovoltaic inverter to output electric energy to the power grid.
Step 3: if the direct current voltage output by the photovoltaic module is unstable in any preset time period, stopping outputting all pulse signals until the direct current voltage output by the photovoltaic module is stable, and respectively outputting pulse signals with different frequencies in a plurality of continuous preset time periods.
In an exemplary embodiment, if the dc voltage after the relay is closed is greater than the first preset voltage threshold for a first preset period of time, the subsequent preset period of time is divided into a plurality of consecutive preset time periods according to the time sequence.
As an example, if the preset duration is 1min, the preset duration is divided into 3 consecutive preset time periods, each of which is 20S, and the serial numbers corresponding to each of the preset time periods are generated according to the time sequence, for example, in 1min, the 1 st to 20 th S are the first preset time period, the 21 st to 40 th S are the second preset time period, and the 41 st to 60 th S are the third preset time period.
In the embodiment of the present application, only 1min is divided into 3 continuous preset time periods as an example for explanation, and in practical application, the time length of the preset time periods may be adaptively adjusted according to practical situations, and the number of the continuous preset time periods may also be adaptively adjusted, which is not limited herein.
And a pulse signal is corresponding to each preset time period, and the frequency of the pulse signal corresponding to each preset time period increases along with the increase of the serial number of the preset time period, namely, the frequency of the pulse signal corresponding to the first preset time period is smaller than the frequency of the pulse signal corresponding to the second preset time period, and the frequency of the pulse signal corresponding to the second preset time period is smaller than the frequency of the pulse signal corresponding to the third preset time period.
And after the pulse signals corresponding to the first preset time period are output, determining the direct current voltage output by the photovoltaic module, and when the direct current voltage output by the photovoltaic module is stable in the first preset time period, outputting the pulse signals corresponding to the second preset time period, and when the direct current voltage output by the photovoltaic module is stable in the second preset time period, outputting the pulse signals corresponding to the third preset time period, and after the pulse signals corresponding to the third preset time period are stable, controlling the photovoltaic inverter to output electric energy to the power grid.
And if the direct current voltage output by the photovoltaic module is unstable in any preset time period, stopping outputting the pulse signal. For example, when the dc voltage in the first preset period is stable, after the pulse signal is output in the second preset period, the output of all the pulse signals is stopped if the dc voltage output by the photovoltaic module is unstable, and after the pulse signal is stopped, the dc voltage output by the photovoltaic module is determined, and then the process returns to the step of respectively outputting the pulse signals with different frequencies in a plurality of continuous preset periods.
In the implementation process, if the direct current voltage after the relay is closed is continuously greater than the first preset voltage threshold value within the first preset time period, pulse signals with different frequencies are respectively output in a plurality of continuous preset time periods in an allocation mode, so that the consumption of the direct current voltage when different power electric appliance elements in the photovoltaic inverter operate can be detected, after the direct current voltage in all the preset time periods is stable, the photovoltaic inverter is controlled to output electric energy to a power grid, and the problem of equipment burnout caused by unstable power supply of the photovoltaic module in a weak light state is further avoided.
In some of these embodiments, the method may further comprise:
step 1: and if the direct current voltage after the relay is closed is not continuously greater than the first preset voltage threshold value within the first preset time, opening the relay.
Step 2: and determining the direct-current voltage output by the photovoltaic module again until the voltage of the photovoltaic module is stable, and controlling the relay to be closed.
If the dc voltage after the relay is closed is not continuously greater than the first preset voltage threshold within the first preset duration, the relay is opened, the stability of the dc voltage output by the photovoltaic module is determined again after the relay is opened, the relay is closed again, and the step of detecting the stability of the dc voltage output by the photovoltaic module is repeated.
In the implementation process, when the direct current voltage after the relay is closed is not continuously greater than the first preset voltage threshold value within the first preset time, the fact that the output voltage of the current photovoltaic module cannot maintain the normal operation of the auxiliary power supply module, the control module and the relay is achieved, the relay is disconnected, the stability of the direct current voltage is detected again, the relay is closed after the direct current voltage is stable, the stability of the direct current voltage is continuously detected, and the test of the stability of the direct current voltage output by the photovoltaic module before the photovoltaic inverter operates is facilitated.
In some embodiments, the pulse signal further includes a second pulse signal, and if it is determined that the voltage is stable based on the dc voltage after the pulse signal is output, controlling the photovoltaic inverter to output the electric energy to the power grid may include the steps of:
step 1: and after the first pulse signal is obtained and output, the first direct-current voltage output by the photovoltaic module is obtained.
Step 2: if the voltage is stable based on the first direct-current voltage, a second pulse signal is output, and the frequency of the second pulse signal is larger than that of the first pulse signal.
Step 3: and after the second pulse signal is obtained and output, outputting a second direct-current voltage by the photovoltaic module.
Step 4: and if the voltage stability is determined based on the second direct-current voltage, controlling the photovoltaic inverter to output electric energy to the power grid.
For example, when the pulse signal generating unit outputs the first pulse signal, the first dc voltage output by the photovoltaic module after the first pulse signal is output is obtained, the first dc voltage may be the voltage of the input capacitor after the first pulse signal is output, and the stability of the first dc voltage is determined.
Specifically, the first pulse signal may be a pulse wave with power of 20W, duration of 20ms and interval time of 180ms, at this time, the pulse wave may be used to detect consumption of dc voltage by an electrical element with power of less than 2W, or the first pulse signal may be set as a pulse wave with power of 10W, duration of 10ms and interval time of 90ms, at this time, the pulse wave may be used to detect consumption of dc voltage by an electrical element with power of less than 1W, and in practical application, the size of the first pulse signal may be adaptively set according to the power of the electrical element to be tested.
Further, stability of the first direct-current voltage is determined, when the first direct-current voltage is stable, the pulse signal generating unit is controlled to output a second pulse signal, and frequency of the second pulse signal is larger than that of the first pulse signal, so that stability of the output direct-current voltage of the photovoltaic module can be detected when the high-power electrical element operates through the second pulse signal.
And after the second pulse signal is output, determining a second direct-current voltage output by the photovoltaic module, namely, after the second direct-current voltage is the voltage of the input capacitor and the second pulse signal is output, determining the stability of the second direct-current voltage, and after the second direct-current power supply is stable, controlling the photovoltaic inverter to output electric energy to the power grid.
In the implementation process, after the first pulse signal is output, the stability of the first direct current voltage is determined, after the first direct current voltage is stabilized, the second pulse signal is output, the stability of the second direct current voltage is detected, and the consumption of the direct current voltage when the electric elements with different power magnitudes in the photovoltaic inverter are operated is detected through the pulse signals with different frequencies, so that the detection of the power supply stability of the photovoltaic module is realized when the photovoltaic inverter is operated normally, and after the second direct current voltage is stabilized, namely, the current direct current voltage can maintain the integral normal operation of the photovoltaic inverter, at the moment, the photovoltaic inverter is controlled to output electric energy to a power grid, and the problem of equipment burnout caused by unstable power supply of the photovoltaic module in a weak light state is avoided.
In some embodiments, if it is determined that the voltage is stable based on the first direct current voltage, outputting the second pulse signal may include:
if the first direct current voltage is continuously larger than the second preset voltage threshold value within the second preset time period, the voltage is stable, and a second pulse signal is output.
If the first direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the first pulse signal is stopped, and the first pulse signal is output after the voltage is stable.
The stability of the first dc voltage may be determined by a second preset time period and a second preset voltage threshold, the second pulse signal may be output when the first dc voltage is stable, and the first pulse signal may be stopped when the first dc voltage is unstable.
Specifically, if the first dc voltage is continuously greater than the second preset voltage threshold within the second preset time period, the first dc voltage is indicated to be stable, and then the pulse signal generating unit can be controlled to output the second pulse signal.
If the first direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the first pulse signal is stopped, and the stability of the direct current voltage of the photovoltaic module is determined.
It should be noted that, the manner of detecting the stability of the dc voltage after stopping outputting the first pulse signal may be determined by the first preset duration and the first preset voltage threshold.
And outputting the first pulse signal again after the direct-current voltage of the photovoltaic module is stabilized, and returning to the step of determining the stability of the first direct-current voltage.
It should be noted that the second preset duration may be 5S, or may be 6S, or may be 7S, which is not limited herein, and the second preset voltage threshold may be equal to or different from the first preset voltage threshold.
In the implementation process, the stability of the first direct current voltage is determined through the second preset time length and the second preset voltage threshold value, the second pulse signal is output after the first direct current voltage is stable, if the first direct current voltage is unstable, the output of the first pulse signal is stopped, the stability detection of the direct current voltage is performed, the first pulse signal is output again after the direct current voltage is stable, and therefore the power supply stability detection can be repeatedly performed when the power supply of the photovoltaic inverter is unstable.
In some of these embodiments, if voltage stabilization is determined based on the second dc voltage, controlling the photovoltaic inverter to output electrical energy to the grid includes:
if the second direct current voltage is continuously larger than the second preset voltage threshold value within the second preset time period, the voltage is stable, and the photovoltaic inverter is controlled to output electric energy to the power grid.
If the second direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the second pulse signal is stopped, and the first pulse signal is output after the voltage is stable.
For example, in the case of a stability detection of the second dc voltage, the determination can also be made by a second predetermined time period and a second predetermined voltage threshold value.
Specifically, if the second direct current voltage is continuously greater than the second preset voltage threshold value within the second preset time period, the second direct current voltage is stable, so that the current power supply voltage of the photovoltaic module can maintain the photovoltaic inverter to stably operate, the photovoltaic inverter is controlled to output electric energy to the power grid, and the problem that equipment is not burnt out due to a weak light state when the photovoltaic inverter normally operates is solved.
If the second direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time, the second direct current voltage is unstable, the output of the second pulse signal is stopped, the direct current voltage of the photovoltaic module is obtained when no pulse signal is obtained, the stability of the direct current voltage of the photovoltaic module after no pulse signal is determined, at this time, the stability of the direct current voltage can be determined through the first preset time and the second preset voltage threshold value until the direct current voltage is stable, and the step of outputting the first pulse signal is returned until the direct current voltage is stable, so that the stability detection of the voltage during the operation of the photovoltaic inverter is realized.
In the implementation process, the stability of the second direct current voltage is determined through the second preset time length and the second preset voltage threshold value, the photovoltaic inverter is controlled to transmit electric energy to the power grid when the second direct current voltage is stable, if the second direct current voltage is unstable, the output of the second pulse signal is stopped, and after the voltage is stable, the step of outputting the first pulse signal is returned, so that the power supply capacity of the photovoltaic module can be continuously detected conveniently.
In some of these embodiments, the second preset time period is less than the first preset time period.
The second preset duration is, for example, less than the first preset duration, for example, the first preset duration is 30S, and the second preset duration is 5S, and in practical application, the first preset duration and the second preset duration may be other time values, and only the first preset duration is required to be longer than the second preset duration, which is not limited herein.
In the implementation process, the first preset time length is longer than the second preset time length, so that the accuracy of determining the stability of the direct-current voltage of the photovoltaic module can be improved.
Another control method of the photovoltaic inverter is also provided in the present embodiment. Fig. 3 is a flowchart of an embodiment of a control method of a photovoltaic inverter according to an embodiment of the present application, as shown in fig. 3, the flowchart includes the following steps:
In step S301, the photovoltaic module outputs a voltage to the auxiliary power module.
Specifically, when the photovoltaic module starts to supply power, voltage is output to the auxiliary power supply module and the input capacitor, and the electric energy of the photovoltaic module is consumed through the auxiliary power supply module, so that the auxiliary power supply module can work normally in a low light state.
Step S302, judging whether the auxiliary power supply module works normally or not, and stabilizing the direct current voltage.
Further, whether the electric energy provided by the photovoltaic module at present can meet the normal work of the auxiliary power supply module is judged, and whether the direct current voltage in the input capacitor is stable or not is judged.
If the current power provided by the photovoltaic module cannot meet the normal operation of the auxiliary power supply module or the direct current voltage in the input capacitor is unstable, the step S301 is returned to.
Specifically, whether the dc voltage in the input capacitor is stable or not may be determined by determining whether the dc voltage in the input capacitor is maintained at 15V or more in 30S, when the dc voltage in the input capacitor is maintained at 15V or more in 30S, the dc voltage in the input capacitor is stable, and when the dc voltage in the input capacitor is not maintained at 15V or more in 30S, the dc voltage in the input capacitor is unstable.
If the current power provided by the photovoltaic module can meet the normal operation of the auxiliary power supply module and the direct current voltage in the input capacitor is stable, step S303 is performed.
Step S303, closing the relay.
Specifically, when the current electric energy provided by the photovoltaic module can meet the normal work of the auxiliary power supply module, and the direct current voltage in the input capacitor is stable, a relay in the photovoltaic inverter is closed.
Step S304, judging whether the direct current voltage is stable within a first preset time period.
Further, after the relay is closed, whether the direct current voltage in the input capacitor is stable or not is judged, namely whether the direct current voltage in the input capacitor is always maintained to be above 15V or not is judged within a first preset time period, wherein the first preset time period can be 30S.
If the dc voltage in the input capacitor is not maintained at 15V or more for 30S, the process proceeds to step S305.
If the dc voltage in the input capacitor is maintained at 15V or more for 30S, the process proceeds to step S306.
Step S305 turns off the relay.
Specifically, when the relay is closed, the dc voltage in the input capacitor is not maintained at 15V or more for 30S, the relay is opened, and the process returns to step S301.
Step S306, outputting a first pulse signal.
Specifically, when the dc voltage in the input capacitor is maintained at 15V or more for 30S, the pulse signal generating unit is controlled to output a first pulse signal, which is, as an example, a pulse wave having a power of 20W, a duration of 20ms, and an interval of 180ms, and continuously transmit the pulse wave.
Step S307, determining whether the dc voltage is stable within a second preset period.
Further, in the process of sending the first pulse signal, whether the direct current voltage in the input capacitor is stable within a second preset time period is judged.
Specifically, the second preset duration may be 5S, and then it may be determined whether the dc voltage is always maintained at 15V or more in 5S.
If the voltage in the input capacitor is not maintained above 15V in 5S after the first pulse signal is output, the dc voltage is unstable for a second preset period of time, and the process proceeds to step S308.
If the voltage in the input capacitor is maintained above 15V in 5S after the first pulse signal is output, the dc voltage is stable in the second preset period of time, and the process proceeds to step S309.
Step S308, the output of the first pulse signal is stopped.
Specifically, after the first pulse signal is output, the voltage in the input capacitor is not maintained above 15V in 5S, and the dc voltage is unstable in the second preset period, the output of the first pulse signal is stopped, and the process returns to step S304.
Step S309, outputting a second pulse signal.
Specifically, after the first pulse signal is output, the voltage in the input capacitor is always maintained above 15V in 5S, so that the direct current voltage is stable in a second preset time period, the pulse signal generating unit can be controlled to output the second pulse signal, and the first pulse signal is not output.
As an example, the second pulse signal may be a pulse wave having a power of 20W, a duration of 20ms, and an interval of 80ms, and continuously transmitting the pulse wave.
Step S310, judging whether the direct current voltage is stable within a second preset time period.
Further, after the second pulse signal is output, whether the direct current voltage in the input capacitor is stable within a second preset time period is judged.
If the voltage in the input capacitor is not maintained above 15V in 5S after the second pulse signal is output, the dc voltage is unstable for a second preset period of time, and the process proceeds to step S311.
If the voltage in the input capacitor is maintained above 15V in 5S after the second pulse signal is output, the dc voltage is stable in the second preset period of time, and the process proceeds to step S312.
Step S311, the output of the second pulse signal is stopped.
Specifically, after the second pulse signal is output, the voltage in the input capacitor is not maintained above 15V in 5S, and the dc voltage is unstable in a second preset period, the output of the second pulse signal is stopped, and the process returns to step S304.
Step S312, the photovoltaic inverter operates normally.
After the first pulse signal is output, the voltage in the input capacitor is always maintained above 15V in 5S, and then the direct current voltage is stable in a second preset time, namely the output voltage of the photovoltaic module can normally maintain the work of the photovoltaic inverter, and further the photovoltaic inverter can be controlled to normally work, namely the photovoltaic inverter starts to normally track the maximum power point of the photovoltaic module to start generating and stops outputting the pulse signal.
Although the steps in the flowcharts according to the embodiments described above are shown in order as indicated by the arrows, these steps are not necessarily executed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
The embodiment also provides a control device of a photovoltaic inverter, which is used for implementing the foregoing embodiments and preferred embodiments, and is not described in detail. The terms "module," "unit," "sub-unit," and the like as used below may refer to a combination of software and/or hardware that performs a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware, are also possible and contemplated.
Fig. 4 is a block diagram of a control device of a photovoltaic inverter according to an embodiment of the present application, as shown in fig. 4, the device includes:
the acquisition module 401 is configured to acquire a dc voltage output by the photovoltaic module after the auxiliary power supply module is turned on;
a pulse signal output module 402, configured to output a pulse signal if the voltage is stable based on the dc voltage determination, so that the pulse signal consumes the dc voltage of the photovoltaic module;
the control module 403 is configured to control the photovoltaic inverter to output electric energy to the power grid if it is determined that the voltage is stable based on the dc voltage after the pulse signal is output.
In some of these embodiments, the pulse signal output module 402 is specifically configured to: if the voltage is stable based on the direct current voltage, outputting a pulse signal, including:
If the direct current voltage is continuously greater than a first preset voltage threshold value within a first preset time period, the voltage of the photovoltaic module is stable, and a relay in the photovoltaic inverter is controlled to be closed;
acquiring a direct-current voltage after a relay is closed;
if the direct current voltage after the relay is closed is continuously greater than a first preset voltage threshold value within a first preset time period, outputting a first pulse signal, wherein the pulse signal comprises the first pulse signal.
In some of these embodiments, the pulse signal output module 402 is further configured to:
if the direct current voltage after the relay is closed is not continuously greater than a first preset voltage threshold value within a first preset time period, the relay is opened;
and determining the direct-current voltage output by the photovoltaic module again until the voltage of the photovoltaic module is stable, and controlling the relay to be closed.
In some embodiments, the pulse signal further includes a second pulse signal, and the control module 403 is specifically configured to:
after a first pulse signal is obtained and output, a first direct-current voltage output by the photovoltaic module is obtained;
if the voltage is stable based on the first direct-current voltage, outputting a second pulse signal, wherein the frequency of the second pulse signal is larger than that of the first pulse signal;
after the second pulse signal is obtained and output, the second direct-current voltage output by the photovoltaic module is obtained;
And if the voltage stability is determined based on the second direct-current voltage, controlling the photovoltaic inverter to output electric energy to the power grid.
In some of these embodiments, the control module 403 is specifically configured to:
if the first direct current voltage is continuously greater than a second preset voltage threshold value within a second preset time period, the voltage is stable, and a second pulse signal is output;
if the first direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the first pulse signal is stopped, and the first pulse signal is output after the voltage is stable.
In some of these embodiments, the control module 403 is specifically configured to:
if the second direct current voltage is continuously greater than a second preset voltage threshold value within a second preset time period, the voltage is stable, and the photovoltaic inverter is controlled to output electric energy to the power grid;
if the second direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the second pulse signal is stopped, and the first pulse signal is output after the voltage is stable.
In some of these embodiments, the second preset time period is less than the first preset time period.
The above-described respective modules may be functional modules or program modules, and may be implemented by software or hardware. For modules implemented in hardware, the various modules described above may be located in the same processor; or the above modules may be located in different processors in any combination.
In one embodiment, a computer device is provided, where the computer device may be a server, and an internal structure diagram of the computer device may be as shown in fig. 5, and fig. 5 is an internal structure diagram of the computer device provided by an embodiment of the present application. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is for storing data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of controlling a photovoltaic inverter.
It will be appreciated by those skilled in the art that the structure shown in FIG. 5 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, there is also provided an electronic device including a memory and a processor, the memory storing a computer program, the processor implementing the steps of the method embodiments described above when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
The user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (StaticRandom Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (9)

1. A method of controlling a photovoltaic inverter, the method comprising:
after the auxiliary power supply module is started, obtaining direct-current voltage output by the photovoltaic module;
if the voltage stability is determined based on the direct-current voltage, outputting a pulse signal so that the pulse signal consumes the direct-current voltage of the photovoltaic module;
and if the voltage is stable based on the direct current voltage, outputting a pulse signal, including:
If the direct current voltage is continuously greater than a first preset voltage threshold value within a first preset time period, the voltage of the photovoltaic module is stable, and a relay in the photovoltaic inverter is controlled to be closed;
acquiring the direct-current voltage of the relay after being closed;
if the direct current voltage after the relay is closed is continuously greater than the first preset voltage threshold value within the first preset time period, outputting a first pulse signal, wherein the pulse signal comprises the first pulse signal;
and if the voltage stability is determined based on the direct-current voltage after the pulse signal is output, controlling the photovoltaic inverter to output electric energy to a power grid.
2. The method for controlling a photovoltaic inverter according to claim 1, characterized in that the method further comprises:
if the direct current voltage after the relay is closed is not continuously greater than the first preset voltage threshold value within the first preset time period, the relay is disconnected;
and determining the direct-current voltage output by the photovoltaic module again until the voltage of the photovoltaic module is stable, and controlling the relay to be closed.
3. The method according to claim 1, wherein the pulse signal further includes a second pulse signal, and the controlling the photovoltaic inverter to output electric energy to the electric grid if it is determined that the voltage is stable based on the dc voltage after outputting the pulse signal includes:
After the first pulse signal is obtained and output, the first direct-current voltage output by the photovoltaic module is obtained;
outputting a second pulse signal if the voltage is stable based on the first direct current voltage, wherein the frequency of the second pulse signal is greater than that of the first pulse signal;
after the second pulse signal is obtained and output, the second direct-current voltage output by the photovoltaic module is obtained;
and if the voltage stability is determined based on the second direct-current voltage, controlling the photovoltaic inverter to output electric energy to the power grid.
4. The method according to claim 3, wherein outputting the second pulse signal if it is determined that the voltage is stable based on the first direct current voltage, comprises:
if the first direct current voltage is continuously greater than a second preset voltage threshold value within a second preset time period, the voltage is stable, and a second pulse signal is output;
if the first direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the first pulse signal is stopped, and the first pulse signal is output after the voltage is stable.
5. A control method of a photovoltaic inverter according to claim 3, wherein if voltage stabilization is determined based on the second direct current voltage, controlling the photovoltaic inverter to output electric energy to the electric grid comprises:
If the second direct current voltage is continuously greater than a second preset voltage threshold value within a second preset time period, the voltage is stable, and the photovoltaic inverter is controlled to output electric energy to the power grid;
if the second direct current voltage is not continuously greater than the second preset voltage threshold value within the second preset time period, the voltage is unstable, the output of the second pulse signal is stopped until the voltage is stable, and the first pulse signal is output.
6. The method according to claim 4, wherein the second preset time period is shorter than the first preset time period.
7. A control device for a photovoltaic inverter, the device comprising:
the acquisition module is used for acquiring the direct-current voltage output by the photovoltaic module after the auxiliary power supply module is started;
the pulse signal output module is used for outputting a pulse signal if the voltage is stable based on the direct-current voltage, so that the pulse signal consumes the direct-current voltage of the photovoltaic module;
the pulse signal output module is specifically used for: if the direct current voltage is continuously greater than a first preset voltage threshold value within a first preset time period, the voltage of the photovoltaic module is stable, and a relay in the photovoltaic inverter is controlled to be closed; acquiring the direct-current voltage of the relay after being closed; if the direct current voltage after the relay is closed is continuously greater than the first preset voltage threshold value within the first preset time period, outputting a first pulse signal, wherein the pulse signal comprises the first pulse signal;
And the control module is used for controlling the photovoltaic inverter to output electric energy to the power grid if the voltage stability is determined based on the direct-current voltage after the pulse signal is output.
8. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the method of controlling a photovoltaic inverter of any of claims 1 to 6.
9. 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 control method of a photovoltaic inverter of any one of claims 1 to 6.
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