CN117559522A - Off-grid photovoltaic power station control method and device, electronic equipment and medium - Google Patents

Off-grid photovoltaic power station control method and device, electronic equipment and medium Download PDF

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Publication number
CN117559522A
CN117559522A CN202311482498.5A CN202311482498A CN117559522A CN 117559522 A CN117559522 A CN 117559522A CN 202311482498 A CN202311482498 A CN 202311482498A CN 117559522 A CN117559522 A CN 117559522A
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CN
China
Prior art keywords
current voltage
direct
sub
voltage curve
direct current
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CN202311482498.5A
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Chinese (zh)
Inventor
雷杰
司凯龙
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Zhongke Hongyi Education Technology Group Co ltd
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Zhongke Hongyi Education Technology Group Co ltd
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Priority to CN202311482498.5A priority Critical patent/CN117559522A/en
Publication of CN117559522A publication Critical patent/CN117559522A/en
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Classifications

    • 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
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • 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)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to the field of photovoltaics, in particular to an off-grid photovoltaic power station control method, an off-grid photovoltaic power station control device, electronic equipment and a medium, wherein the method comprises the following steps: acquiring direct-current voltage curves corresponding to a plurality of inverters in an off-grid photovoltaic power station; judging whether a target direct-current voltage curve exists or not based on direct-current voltage curves corresponding to the inverters, wherein the sub-photovoltaic module array corresponding to the inverter corresponding to the target direct-current voltage curve is shielded; the method comprises the steps of obtaining an inverter identifier corresponding to a target direct-current voltage curve to determine a sub-photovoltaic module array identifier corresponding to the inverter identifier; and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier, wherein the storage battery compensation instruction is used for controlling the storage battery system to supply power together with the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier. The power supply stability of off-grid photovoltaic power station can be improved.

Description

Off-grid photovoltaic power station control method and device, electronic equipment and medium
Technical Field
The application relates to the technical field of photovoltaics, in particular to an off-grid photovoltaic power station control method, an off-grid photovoltaic power station control device, electronic equipment and a medium.
Background
There are various types of photovoltaic power plants, including off-grid photovoltaic power plants. Off-grid photovoltaic plants refer to systems that operate independently of the grid. In off-grid photovoltaic power stations, a photovoltaic power generation system and an energy storage battery system are key components, the photovoltaic power generation system is usually composed of a photovoltaic module array, an inverter and the like, the photovoltaic module array comprises a plurality of sub-photovoltaic module arrays, and the sub-photovoltaic module arrays are formed by connecting a plurality of photovoltaic modules. Each sub-photovoltaic module array is provided with a corresponding inverter so as to convert direct current output by the sub-photovoltaic module array into alternating current, thereby directly supplying energy to a load.
At present, there is a multi-machine off-grid parallel control technology, which is based on that a plurality of inverters are connected in parallel through an alternating current output side, a control unit in one inverter is used as a control host, an alternating current instruction value is generated through a voltage regulator of the control host, and the alternating current instruction value is issued to control units in other parallel inverters through a parallel communication process; and then, the control unit in each inverter respectively adjusts output current through a current regulator of the control unit according to the same alternating current command value, and finally, off-grid alternating voltage output by multiple inverters in parallel is controlled to a target value, so that stable active and reactive power is provided for an alternating current load.
However, according to the multi-machine off-grid parallel control technology, stable active power and reactive power can be provided for a load only under the condition that the sub-photovoltaic module array connected with each inverter receives enough illumination; when a certain sub-photovoltaic module array is shielded, the alternating current command value of the control host is unchanged, and the sub-photovoltaic module array cannot reach the maximum power generation power, so that the direct current voltage of the inverter corresponding to the sub-photovoltaic module array is suddenly reduced, and the direct current undervoltage protection of the inverter is triggered, and the load is powered off.
Therefore, how to improve the power supply stability of the off-grid photovoltaic power station is a technical problem to be solved by the skilled person.
Disclosure of Invention
In order to achieve improvement of power supply stability of off-grid photovoltaic power stations, the application provides a control method, a device, electronic equipment and a medium of the off-grid photovoltaic power stations.
In a first aspect, the present application provides an off-grid photovoltaic power station control method, which adopts the following technical scheme:
the off-grid photovoltaic power station control method is applied to the off-grid photovoltaic power station, a storage battery system in the off-grid photovoltaic power station can be connected with a plurality of sub-photovoltaic module arrays,
the off-grid photovoltaic power station control method comprises the following steps:
acquiring direct-current voltage curves corresponding to a plurality of inverters in an off-grid photovoltaic power station;
judging whether a target direct-current voltage curve exists or not based on the direct-current voltage curves corresponding to the inverters, wherein the sub-photovoltaic module array corresponding to the inverter corresponding to the target direct-current voltage curve is shielded;
acquiring an inverter identifier corresponding to the target direct-current voltage curve to determine a sub-photovoltaic module array identifier corresponding to the inverter identifier;
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier, wherein the storage battery compensation instruction is used for controlling the storage battery system to supply power together with the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier.
By adopting the technical scheme, the direct-current voltage curves corresponding to the inverters in the off-grid photovoltaic power station are obtained, so that the direct-current voltages of the inverters are monitored; judging whether a target direct-current voltage curve exists or not based on direct-current voltage curves corresponding to the inverters, and judging whether a sub-photovoltaic module array corresponding to the inverter is possibly covered or not based on the direct-current voltage; if the sub-photovoltaic module array which is possibly covered exists, determining a sub-photovoltaic module array identifier of the photovoltaic module so as to generate a storage battery compensation instruction; compared with the situation that the sub-photovoltaic module array cannot reach the maximum generation power in the multi-machine off-grid parallel control technology, the direct-current voltage of the inverter corresponding to the sub-photovoltaic module array is sharply reduced, the direct-current under-voltage protection of the inverter is triggered, and the load is powered off is caused.
The present application may be further configured in a preferred example to:
the determining whether a target dc voltage curve exists based on the dc voltage curves corresponding to the plurality of inverters includes:
judging whether the direct current voltage curve is a first direct current voltage curve comprising any preset curve characteristic aiming at each direct current voltage curve, wherein the different preset curve characteristics correspond to different covering modes;
if yes, determining a second direct current voltage curve with the same preset curve characteristic as the direct current voltage curve by comparing the first direct current voltage curve with other direct current voltage curves one by one;
and taking each direct current voltage curve included in the curve group as each target direct current voltage curve, wherein the curve group comprises any one of the first direct current voltage curves and a plurality of second direct current voltage curves corresponding to the first direct current voltage curve.
By adopting the technical scheme, whether the direct-current voltage curve is a first direct-current voltage curve comprising preset curve characteristics is judged according to each direct-current voltage curve, and compared with the fact that whether all preset curve characteristics are included or not is determined, the speed of determining the first direct-current voltage curve is improved by determining whether any preset curve characteristic exists in the direct-current voltage curve or not; after the first direct-current voltage curve is determined faster, a second direct-current voltage curve with the same preset curve characteristic as the direct-current voltage curve is determined by comparing the first direct-current voltage curve with other direct-current voltage curves one by one, so that whether the second direct-current voltage curve with the same covering mode as the first direct-current voltage curve exists in the other direct-current voltage curves is determined; and taking all the direct-current voltage curves in the curve group as target direct-current voltage curves to further expand the number of preset curve features possibly included in the photovoltaic module array, thereby improving the probability that the target direct-current voltage curves can be more comprehensively determined.
The present application may be further configured in a preferred example to:
before the storage battery compensation instruction is generated based on the sub-photovoltaic module array identifier, the method further comprises the following steps:
determining a direct current voltage reduction amplitude based on the target direct current voltage curve and a preset direct current voltage curve;
correspondingly, the generating the storage battery compensation instruction based on the sub-photovoltaic module array identifier comprises the following steps:
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier and the direct-current voltage reduction amplitude.
By adopting the technical scheme, the direct-current voltage reduction amplitude is determined based on the target direct-current voltage curve and the preset direct-current voltage curve, so that the situations of overlarge or undersize voltage compensation of the storage battery caused by different direct-current voltage reduction amplitudes due to different shielding are reduced; based on the sub-photovoltaic module array identification and the direct-current voltage reduction amplitude, a storage battery compensation instruction is generated, and the direct-current voltage corresponding to the inverter can be more accurately kept at a preset value, so that the stability of power supply of the off-grid photovoltaic power station is further improved.
The present application may be further configured in a preferred example to:
before the step of determining the direct current voltage reduction amplitude based on the target direct current voltage curve and the preset direct current voltage curve, the method further comprises the following steps:
determining a normal direct current voltage curve corresponding to each normal working inverter;
and carrying out average value processing based on all the normal direct current voltage curves to obtain the preset direct current voltage curve.
By adopting the technical scheme, the normal direct-current voltage curve is determined so as to determine the direct-current voltage curve of the sub-photovoltaic module array which works normally, and the preset direct-current voltage curve is obtained by carrying out mean value processing based on all the normal direct-current voltage curves, so that the direct-current voltage curve corresponding to the sub-photovoltaic module array which works normally at the current moment can be better reflected, and the instantaneity of the preset direct-current voltage curve is improved.
The present application may be further configured in a preferred example to:
after the storage battery compensation instruction is generated based on the sub-photovoltaic module array identifier, the method further comprises the following steps:
acquiring a current wind speed set;
judging whether the cloud and fog shielding exists or not based on the current wind speed set;
if not, generating an overhaul instruction, wherein the overhaul instruction is used for prompting an overhaul worker to overhaul the sub-photovoltaic module array corresponding to the target sub-photovoltaic module array identifier.
By adopting the technical scheme, compared with the method for judging whether the sub-photovoltaic module is shielded or not, the method further judges whether the sub-photovoltaic module is shielded by cloud, and when the sub-photovoltaic module is shielded by cloud, namely, a shielding object is the cloud, the output direct-current voltage is smaller, and at the moment, the shielding object cannot be removed through personnel overhaul; however, when the shielding object is sundries except cloud fog, the shielding object can be removed by prompting an maintainer, and normal power supply of the sub-photovoltaic module array can be recovered in time.
In a second aspect, the present application provides an off-grid photovoltaic power station control device, which adopts the following technical scheme:
an off-grid photovoltaic power plant control device, comprising:
the curve acquisition module is used for acquiring direct-current voltage curves corresponding to a plurality of inverters in the off-grid photovoltaic power station respectively;
the shielding judging module is used for judging whether a target direct-current voltage curve exists or not based on the direct-current voltage curves corresponding to the inverters, wherein the sub-photovoltaic module array corresponding to the inverter corresponding to the target direct-current voltage curve is shielded;
the sub-photovoltaic module array determining module is used for acquiring an inverter identifier corresponding to the target direct-current voltage curve so as to determine a sub-photovoltaic module array identifier corresponding to the inverter identifier;
the command generation module is used for generating a storage battery compensation command based on the sub-photovoltaic module array identifier, wherein the storage battery compensation command is used for controlling the storage battery system to supply power together with the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier.
The present application may be further configured in a preferred example to:
the shielding judging module is used for judging whether a target direct-current voltage curve exists or not when executing the direct-current voltage curve corresponding to each of the plurality of inverters:
judging whether the direct current voltage curve is a first direct current voltage curve comprising any preset curve characteristic aiming at each direct current voltage curve, wherein the different preset curve characteristics correspond to different covering modes;
if yes, determining a second direct current voltage curve with the same preset curve characteristic as the direct current voltage curve by comparing the first direct current voltage curve with other direct current voltage curves one by one;
and taking each direct current voltage curve included in the curve group as each target direct current voltage curve, wherein the curve group comprises any one of the first direct current voltage curves and a plurality of second direct current voltage curves corresponding to the first direct current voltage curve.
The present application may be further configured in a preferred example to: off-grid photovoltaic power plant controlling means still includes:
the reduction amplitude determining module is used for determining the reduction amplitude of the direct current voltage based on the target direct current voltage curve and a preset direct current voltage curve;
correspondingly, the instruction generating module is used for generating a storage battery compensation instruction when executing the storage battery compensation instruction based on the sub-photovoltaic module array identifier:
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier and the direct-current voltage reduction amplitude.
In a third aspect, the present application provides an electronic device, which adopts the following technical scheme:
at least one processor;
a memory;
at least one application program, wherein the at least one application program is stored in the memory and configured to be executed by the at least one processor, the at least one application program configured to: an off-grid photovoltaic power plant control method as claimed in any one of the first aspects is performed.
In a fourth aspect, the present application provides a computer readable storage medium, which adopts the following technical scheme:
a computer readable storage medium having stored thereon a computer program which, when executed in a computer, causes the computer to perform the off-grid photovoltaic power plant control method of any of the first aspects.
In summary, the present application at least includes the following beneficial technical effects:
acquiring direct current voltage curves corresponding to a plurality of inverters in an off-grid photovoltaic power station respectively so as to monitor the direct current voltages of the inverters; judging whether a target direct-current voltage curve exists or not based on direct-current voltage curves corresponding to the inverters, and judging whether a sub-photovoltaic module array corresponding to the inverter is possibly covered or not based on the direct-current voltage; if the sub-photovoltaic module array which is possibly covered exists, determining a sub-photovoltaic module array identifier of the photovoltaic module so as to generate a storage battery compensation instruction; compared with the situation that the sub-photovoltaic module array cannot reach the maximum generation power in the multi-machine off-grid parallel control technology, the direct-current voltage of the inverter corresponding to the sub-photovoltaic module array is sharply reduced, the direct-current under-voltage protection of the inverter is triggered, and the load is powered off is caused.
Drawings
Fig. 1 is a schematic flow chart of an off-grid photovoltaic power station control method according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an off-grid photovoltaic power station control device according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of an off-grid photovoltaic power station according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to fig. 1-3.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the present application.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In addition, the term "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, unless otherwise specified, the term "/" generally indicates that the associated object is an "or" relationship.
Embodiments of the present application are described in further detail below with reference to the drawings attached hereto.
The embodiment of the application provides a control method of an off-grid photovoltaic power station, which is executed by electronic equipment, wherein the electronic equipment can be a control unit of any inverter in the off-grid photovoltaic power station, and the embodiment of the application does not limit which sub-photovoltaic module array corresponds to the inverter.
As shown in fig. 1, the method includes steps S101 to S104, wherein:
step S101: and acquiring direct-current voltage curves corresponding to the inverters in the off-grid photovoltaic power station.
The direct current voltage curve comprises a direct current voltage value corresponding to the current moment and a direct current voltage value corresponding to each historical moment in a preset time period corresponding to the current moment. The foregoing preset period of time may be preset by a technician and stored in the electronic device, and embodiments of the present application are not specifically limited. The preset time period corresponding to the current time is a time interval comprising the current time, and the current time is the right endpoint of the time interval.
Step S102: and judging whether a target direct-current voltage curve exists or not based on the direct-current voltage curves corresponding to the inverters, wherein the sub-photovoltaic module array corresponding to the inverter corresponding to the target direct-current voltage curve is shielded.
It can be understood that the sub-photovoltaic module array can supply power with maximum power when fully receiving sunlight, i.e. output the dc voltage value required by the inverter, so that the output value of the inverter can reach the preset ac voltage value for supplying power to the load. However, when the sub-photovoltaic module is shielded, the probability that the sub-photovoltaic module can output the direct current voltage value required by the inverter is small, so whether the sub-photovoltaic module array corresponding to the inverter is shielded can be determined by judging whether the direct current voltage value corresponding to the inverter is smaller than the required direct current voltage value. Further, the instantaneous voltage may be distorted, so the scheme utilizes the direct-current voltage curve to more accurately determine whether the sub-photovoltaic component is shielded.
Step S103: and acquiring an inverter identifier corresponding to the target direct-current voltage curve to determine a sub-photovoltaic module array identifier corresponding to the inverter identifier.
Each inverter identifier has a corresponding direct-current voltage curve and a corresponding sub-photovoltaic module array identifier, wherein the inverter identifier can be the number or the position of the inverter, the application embodiment of the sitting specimen is not particularly limited, and the sub-photovoltaic module array identifier can be the number or the position information of the sub-photovoltaic module array, and the application embodiment of the sitting specimen is not particularly limited.
Step S104: and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier, wherein the storage battery compensation instruction is used for controlling the storage battery system to supply power together with the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier.
Specifically, the electronic equipment generates a storage battery compensation instruction by utilizing the sub-photovoltaic module array identifier, the storage battery compensation instruction controls a linkage switch corresponding to the sub-photovoltaic module array identifier in the storage battery system so as to connect the storage battery system into a circuit between the inverter and the sub-photovoltaic module array, wherein the linkage switch comprises a branch circuit which does not comprise the storage battery system and a branch circuit which comprises the storage battery system, the switch on the branch circuit which does not comprise the storage battery system is in a normally closed state when the corresponding sub-photovoltaic module array normally works, the branch circuit which comprises the storage battery system is in a normally open state, and the switch on the branch circuit which does not comprise the storage battery system is in a normally open state when the corresponding sub-photovoltaic module array is shielded from working, and the branch circuit which comprises the storage battery system is in a normally closed state.
It should be noted that the storage battery system and the sub-photovoltaic system are connected in series, so that the direct-current voltage can be compensated.
In the embodiment of the application, a direct-current voltage curve corresponding to each of a plurality of inverters in an off-grid photovoltaic power station is obtained so as to monitor the direct-current voltages of the plurality of inverters; judging whether a target direct-current voltage curve exists or not based on direct-current voltage curves corresponding to the inverters, and judging whether a sub-photovoltaic module array corresponding to the inverter is possibly covered or not based on the direct-current voltage; if the sub-photovoltaic module array which is possibly covered exists, determining a sub-photovoltaic module array identifier of the photovoltaic module so as to generate a storage battery compensation instruction; compared with the situation that the sub-photovoltaic module array cannot reach the maximum generation power in the multi-machine off-grid parallel control technology, the direct-current voltage of the inverter corresponding to the sub-photovoltaic module array is sharply reduced, the direct-current under-voltage protection of the inverter is triggered, and the load is powered off is caused.
In one possible implementation manner of the embodiment of the present application, step S102, based on the dc voltage curves corresponding to the multiple inverters, may specifically include:
judging whether the direct-current voltage curve is a first direct-current voltage curve comprising any preset curve characteristic aiming at each direct-current voltage curve, wherein the corresponding covering modes of different preset curve characteristics are different;
if yes, the first direct-current voltage curve and other direct-current voltage curves are compared one by one, and a second direct-current voltage curve with the same preset curve characteristic as the direct-current voltage curve is determined;
and taking each direct current voltage curve included in the curve group as each target direct current voltage curve, wherein the curve group comprises any one first direct current voltage curve and a plurality of second direct current voltage curves corresponding to the first direct current voltage curve.
The preset curve features are curve features corresponding to different covering modes, and are experimentally measured by a technician based on the different covering modes and stored in the electronic equipment in advance.
The step-by-step comparison of the first direct current voltage curve and other direct current voltage curves is performed, and the determination of the second direct current voltage curve with the same preset curve characteristic as the direct current voltage curve can specifically comprise: determining whether preset curve characteristics included in the first direct current voltage curve exist in other direct current voltage curves according to each other direct current voltage curve, wherein the other direct current voltage curves are direct current voltage curves except the first direct current voltage in the direct current voltage curves corresponding to the plurality of inverters; if yes, the other direct current voltage curves are used as second direct current voltage curves corresponding to the first direct current voltage curves.
The number of the second direct current voltage curves corresponding to any one of the first direct current voltage curves can be 0, 1 or more, and the larger the number of the shaded sub-photovoltaic module arrays in the photovoltaic module arrays is, the larger the probability of the second direct current voltage curves corresponding to the first direct current voltage curves is.
In the embodiment of the application, for each direct-current voltage curve, whether the direct-current voltage curve is a first direct-current voltage curve comprising preset curve characteristics is judged, and compared with the fact that whether all preset curve characteristics are included or not is determined, the speed of determining the first direct-current voltage curve is improved by determining whether any preset curve characteristic exists in the direct-current voltage curve; after the first direct-current voltage curve is determined faster, a second direct-current voltage curve with the same preset curve characteristic as the direct-current voltage curve is determined by comparing the first direct-current voltage curve with other direct-current voltage curves one by one, so that whether the second direct-current voltage curve with the same covering mode as the first direct-current voltage curve exists in the other direct-current voltage curves is determined; and taking all the direct-current voltage curves in the curve group as target direct-current voltage curves to further expand the number of preset curve features possibly included in the photovoltaic module array, thereby improving the probability that the target direct-current voltage curves can be more comprehensively determined.
In a possible implementation manner of the embodiment of the present application, before generating the storage battery compensation instruction based on the sub-photovoltaic module array identifier in step S104, the method may further include:
determining a direct current voltage reduction amplitude based on a target direct current voltage curve and a preset direct current voltage curve;
correspondingly, based on the sub-photovoltaic module array identification, generating a storage battery compensation instruction comprises:
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier and the direct-current voltage reduction amplitude.
The time length corresponding to the preset direct current voltage curve is the same as the time length of the target direct current voltage curve.
Based on the target dc voltage curve and the preset dc voltage curve, determining the dc voltage reduction amplitude may specifically include: for the moments in the same sequence, determining a difference value between the value of the moment in the preset direct-current voltage curve and the value of the moment in the target direct-current voltage curve, wherein the difference value = the value of the moment in the preset direct-current voltage curve-the value of the moment in the target direct-current voltage curve; and calculating the average value of the difference values, and taking the average value as the direct current voltage reduction amplitude.
Based on the sub-photovoltaic module array identification and the direct-current voltage reduction amplitude, after generating a storage battery compensation instruction: the electronic equipment controls the storage battery system to provide voltage of the direct-current voltage compensation value for the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier.
In the embodiment of the application, based on a target direct-current voltage curve and a preset direct-current voltage curve, the direct-current voltage reduction amplitude is determined so as to reduce the occurrence of the situation that the voltage compensation of the storage battery is too large or too small due to the fact that the direct-current voltage reduction amplitude is different due to different shielding; based on the sub-photovoltaic module array identification and the direct-current voltage reduction amplitude, a storage battery compensation instruction is generated, and the direct-current voltage corresponding to the inverter can be more accurately kept at a preset value, so that the stability of power supply of the off-grid photovoltaic power station is further improved.
In one possible implementation manner of the embodiment of the present application, before determining the dc voltage reduction amplitude based on the target dc voltage curve and the preset dc voltage curve, the method may further include:
determining a normal direct current voltage curve corresponding to each normal working inverter;
and carrying out average value processing based on all the normal direct current voltage curves to obtain a preset direct current voltage curve.
The normal working inverter is an inverter corresponding to the sub-photovoltaic module array without shielding, and the normal direct-current voltage curve is a direct-current voltage curve corresponding to the inverter corresponding to the sub-photovoltaic module array without shielding.
Average value processing is performed based on all normal direct current voltage curves to obtain a preset direct current voltage curve, which specifically may include: and determining each normal direct current voltage corresponding to the moment in each normal direct current voltage curve at the same moment, averaging all normal direct current voltages corresponding to the moment to obtain an average value of all normal direct current voltages corresponding to the moment, and taking the average value as a preset direct current voltage corresponding to the moment to obtain a preset direct current voltage curve.
In the embodiment of the application, the normal direct-current voltage curve is determined to determine the direct-current voltage curve of the sub-photovoltaic module array which works normally, and the preset direct-current voltage curve is obtained by carrying out average value processing based on all the normal direct-current voltage curves, so that the direct-current voltage curve corresponding to the sub-photovoltaic module array which works normally at the current moment can be better reflected, and the instantaneity of the preset direct-current voltage curve is improved.
In a possible implementation manner of the embodiment of the present application, after generating the storage battery compensation instruction based on the sub-photovoltaic module array identifier in step S104, the method may further include:
acquiring a current wind speed set;
judging whether the cloud and fog shielding exists or not based on the current wind speed set;
if not, generating an overhaul instruction, wherein the overhaul instruction is used for prompting an overhaul worker to overhaul the sub-photovoltaic module array corresponding to the target sub-photovoltaic module array identifier.
It can be understood that when the cloud mist slowly moves to the vicinity of the sub-photovoltaic module array and shields the sub-photovoltaic module array, the direct current voltage corresponding to the inverter corresponding to the sub-photovoltaic module array does not have abrupt change; cloud and fog shielding the sub-photovoltaic module array at a high speed can cause abrupt change of direct-current voltage corresponding to the inverter.
The current wind speed set comprises wind speeds corresponding to the current moment and wind speeds corresponding to each historical moment in a preset time period corresponding to the current moment. The foregoing preset period of time may be preset by a technician and stored in the electronic device, and embodiments of the present application are not specifically limited. The preset time period corresponding to the current time is a time interval comprising the current time, and the current time is the right endpoint of the time interval.
Based on the current wind speed set, judging whether the cloud and fog are shielded or not specifically can include: judging whether the current wind speed set comprises a high wind speed section, wherein the high wind speed section represents that the wind speed exceeding the fixed duration continuously exceeds a preset high wind speed value in the current wind speed set, and the preset high wind speed value represents the wind speed capable of enabling the cloud and the fog to rapidly move, and can be measured in advance by a technician and then stored in electronic equipment in advance; if the high wind speed section is included, the cloud and fog shielding is determined; otherwise, it is determined that the cloud is not occluded.
In the embodiment of the application, compared with the case of only judging whether the sub-photovoltaic module is shielded, the scheme further judges whether the sub-photovoltaic module is shielded by cloud, when the sub-photovoltaic module is shielded by cloud, namely, the shielding object is the cloud, the output direct-current voltage is smaller, and at the moment, the shielding object cannot be removed through personnel overhaul; however, when the shielding object is sundries except cloud fog, the shielding object can be removed by prompting an maintainer, and normal power supply of the sub-photovoltaic module array can be recovered in time.
The above embodiment describes an off-grid photovoltaic power station control method from the aspect of a method flow, and the following embodiment describes an off-grid photovoltaic power station control device from the aspect of a virtual module or a virtual unit, specifically the following embodiment.
The embodiment of the application provides an off-grid photovoltaic power station control device, as shown in fig. 2, the off-grid photovoltaic power station control device may specifically include:
the curve acquisition module 201 is configured to acquire dc voltage curves corresponding to a plurality of inverters in the off-grid photovoltaic power station;
a shielding judging module 202, configured to judge whether a target dc voltage curve exists based on dc voltage curves corresponding to the plurality of inverters, where a sub-photovoltaic module array corresponding to the inverter corresponding to the target dc voltage curve is shielded;
the sub-photovoltaic module array determining module 203 is configured to obtain an inverter identifier corresponding to the target dc voltage curve, so as to determine a sub-photovoltaic module array identifier corresponding to the inverter identifier;
the instruction generating module 204 is configured to generate a storage battery compensation instruction based on the sub-photovoltaic module array identifier, where the storage battery compensation instruction is used to control the storage battery system to supply power to the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier.
In one possible implementation manner of the embodiment of the present application, the shielding determination module 2002 is configured to, when executing the determination based on the dc voltage curves corresponding to the plurality of inverters, determine whether a target dc voltage curve exists:
judging whether the direct-current voltage curve is a first direct-current voltage curve comprising any preset curve characteristic aiming at each direct-current voltage curve, wherein the corresponding covering modes of different preset curve characteristics are different;
if yes, the first direct-current voltage curve and other direct-current voltage curves are compared one by one, and a second direct-current voltage curve with the same preset curve characteristic as the direct-current voltage curve is determined;
and taking each direct current voltage curve included in the curve group as each target direct current voltage curve, wherein the curve group comprises any one first direct current voltage curve and a plurality of second direct current voltage curves corresponding to the first direct current voltage curve.
One possible implementation manner of the embodiment of the present application, the off-grid photovoltaic power station control device further includes:
the reduction amplitude determining module is used for determining the reduction amplitude of the direct current voltage based on the target direct current voltage curve and a preset direct current voltage curve;
correspondingly, the instruction generation module is used for generating a storage battery compensation instruction when executing the sub-photovoltaic module array identification-based storage battery compensation instruction:
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier and the direct-current voltage reduction amplitude.
One possible implementation manner of the embodiment of the present application, the off-grid photovoltaic power station control device further includes:
the preset direct-current voltage curve determining module is used for:
determining a normal direct current voltage curve corresponding to each normal working inverter;
and carrying out average value processing based on all the normal direct current voltage curves to obtain a preset direct current voltage curve.
One possible implementation manner of the embodiment of the present application, the off-grid photovoltaic power station control device further includes:
the overhaul instruction generation module is used for:
acquiring a current wind speed set;
judging whether the cloud and fog shielding exists or not based on the current wind speed set;
if not, generating an overhaul instruction, wherein the overhaul instruction is used for prompting an overhaul worker to overhaul the sub-photovoltaic module array corresponding to the target sub-photovoltaic module array identifier.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, a specific working process of the off-grid photovoltaic power station control apparatus described above may refer to a corresponding process in the foregoing method embodiment, which is not described herein again.
In an embodiment of the present application, as shown in fig. 3, an electronic device shown in fig. 3 includes: a processor 301 and a memory 303. Wherein the processor 301 is coupled to the memory 303, such as via a bus 302. Optionally, the electronic device may also include a transceiver 304. It should be noted that, in practical applications, the transceiver 304 is not limited to one, and the structure of the electronic device is not limited to the embodiments of the present application.
The processor 301 may be a CPU (Central Processing Unit ), general purpose processor, DSP (Digital Signal Processor, data signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field Programmable Gate Array, field programmable gate array) or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. Processor 301 may also be a combination that implements computing functionality, e.g., comprising one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.
Bus 302 may include a path to transfer information between the components. Bus 302 may be a PCI (Peripheral Component Interconnect, peripheral component interconnect Standard) bus or an EISA (Extended Industry Standard Architecture ) bus, or the like. Bus 302 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 3, but not only one bus or type of bus.
The Memory 303 may be, but is not limited to, a ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, a RAM (Random Access Memory ) or other type of dynamic storage device that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory ), a CD-ROM (Compact Disc Read Only Memory, compact disc Read Only Memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
The memory 303 is used for storing application program codes for executing the present application and is controlled to be executed by the processor 301. The processor 301 is configured to execute the application code stored in the memory 303 to implement what is shown in the foregoing method embodiments.
Among them, electronic devices include, but are not limited to: mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and the like, and stationary terminals such as digital TVs, desktop computers, and the like. But may also be a server or the like. The electronic device shown in fig. 3 is only an example and should not be construed as limiting the functionality and scope of use of the embodiments herein.
The present application provides a computer readable storage medium having a computer program stored thereon, which when run on a computer, causes the computer to perform the corresponding method embodiments described above. Compared with the related art, the method and the device for monitoring the direct-current voltage of the off-grid photovoltaic power station acquire direct-current voltage curves corresponding to the inverters in the off-grid photovoltaic power station so as to monitor the direct-current voltages of the inverters; judging whether a target direct-current voltage curve exists or not based on direct-current voltage curves corresponding to the inverters, and judging whether a sub-photovoltaic module array corresponding to the inverter is possibly covered or not based on the direct-current voltage; if the sub-photovoltaic module array which is possibly covered exists, determining a sub-photovoltaic module array identifier of the photovoltaic module so as to generate a storage battery compensation instruction; compared with the situation that the sub-photovoltaic module array cannot reach the maximum generation power in the multi-machine off-grid parallel control technology, the direct-current voltage of the inverter corresponding to the sub-photovoltaic module array is sharply reduced, the direct-current under-voltage protection of the inverter is triggered, and the load is powered off is caused.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
The foregoing is only a partial embodiment of the present application and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims (10)

1. The off-grid photovoltaic power station control method is characterized by being applied to an off-grid photovoltaic power station, wherein a storage battery system in the off-grid photovoltaic power station can be connected with a plurality of sub-photovoltaic module arrays,
the off-grid photovoltaic power station control method comprises the following steps:
acquiring direct-current voltage curves corresponding to a plurality of inverters in an off-grid photovoltaic power station;
judging whether a target direct-current voltage curve exists or not based on the direct-current voltage curves corresponding to the inverters, wherein the sub-photovoltaic module array corresponding to the inverter corresponding to the target direct-current voltage curve is shielded;
acquiring an inverter identifier corresponding to the target direct-current voltage curve to determine a sub-photovoltaic module array identifier corresponding to the inverter identifier;
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier, wherein the storage battery compensation instruction is used for controlling the storage battery system to supply power together with the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier.
2. The off-grid photovoltaic power plant control method according to claim 1, wherein the determining whether a target dc voltage curve exists based on the dc voltage curves corresponding to the plurality of inverters includes:
judging whether the direct current voltage curve is a first direct current voltage curve comprising any preset curve characteristic aiming at each direct current voltage curve, wherein the different preset curve characteristics correspond to different covering modes;
if yes, determining a second direct current voltage curve with the same preset curve characteristic as the direct current voltage curve by comparing the first direct current voltage curve with other direct current voltage curves one by one;
and taking each direct current voltage curve included in the curve group as each target direct current voltage curve, wherein the curve group comprises any one of the first direct current voltage curves and a plurality of second direct current voltage curves corresponding to the first direct current voltage curve.
3. The off-grid photovoltaic power plant control method according to claim 1, further comprising, before the generating the battery compensation instruction based on the sub-photovoltaic module array identifier:
determining a direct current voltage reduction amplitude based on the target direct current voltage curve and a preset direct current voltage curve;
correspondingly, the generating the storage battery compensation instruction based on the sub-photovoltaic module array identifier comprises the following steps:
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier and the direct-current voltage reduction amplitude.
4. The off-grid photovoltaic power plant control method according to claim 3, further comprising, before the determining the dc voltage reduction amplitude based on the target dc voltage curve and a preset dc voltage curve:
determining a normal direct current voltage curve corresponding to each normal working inverter;
and carrying out average value processing based on all the normal direct current voltage curves to obtain the preset direct current voltage curve.
5. The off-grid photovoltaic power plant control method according to claim 1, further comprising, after the generating the battery compensation instruction based on the sub-photovoltaic module array identifier:
acquiring a current wind speed set;
judging whether the cloud and fog shielding exists or not based on the current wind speed set;
if not, generating an overhaul instruction, wherein the overhaul instruction is used for prompting an overhaul worker to overhaul the sub-photovoltaic module array corresponding to the target sub-photovoltaic module array identifier.
6. An off-grid photovoltaic power plant control device, comprising:
the curve acquisition module is used for acquiring direct-current voltage curves corresponding to a plurality of inverters in the off-grid photovoltaic power station respectively;
the shielding judging module is used for judging whether a target direct-current voltage curve exists or not based on the direct-current voltage curves corresponding to the inverters, wherein the sub-photovoltaic module array corresponding to the inverter corresponding to the target direct-current voltage curve is shielded;
the sub-photovoltaic module array determining module is used for acquiring an inverter identifier corresponding to the target direct-current voltage curve so as to determine a sub-photovoltaic module array identifier corresponding to the inverter identifier;
the command generation module is used for generating a storage battery compensation command based on the sub-photovoltaic module array identifier, wherein the storage battery compensation command is used for controlling the storage battery system to supply power together with the sub-photovoltaic module array corresponding to the sub-photovoltaic module array identifier.
7. The off-grid photovoltaic power plant control apparatus according to claim 6, wherein the shielding determination module, when performing the determination of whether there is a target dc voltage curve based on the dc voltage curves corresponding to the plurality of inverters, is configured to:
judging whether the direct current voltage curve is a first direct current voltage curve comprising any preset curve characteristic aiming at each direct current voltage curve, wherein the different preset curve characteristics correspond to different covering modes;
if yes, determining a second direct current voltage curve with the same preset curve characteristic as the direct current voltage curve by comparing the first direct current voltage curve with other direct current voltage curves one by one;
and taking each direct current voltage curve included in the curve group as each target direct current voltage curve, wherein the curve group comprises any one of the first direct current voltage curves and a plurality of second direct current voltage curves corresponding to the first direct current voltage curve.
8. The off-grid photovoltaic power plant control of claim 6, further comprising:
the reduction amplitude determining module is used for determining the reduction amplitude of the direct current voltage based on the target direct current voltage curve and a preset direct current voltage curve;
correspondingly, the instruction generating module is used for generating a storage battery compensation instruction when executing the storage battery compensation instruction based on the sub-photovoltaic module array identifier:
and generating a storage battery compensation instruction based on the sub-photovoltaic module array identifier and the direct-current voltage reduction amplitude.
9. An electronic device, comprising:
at least one processor;
a memory;
at least one application program, wherein the at least one application program is stored in the memory and configured to be executed by the at least one processor, the at least one application program configured to: an off-grid photovoltaic power plant control method of any one of claims 1 to 5.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which, when executed in a computer, causes the computer to perform the off-grid photovoltaic power plant control method of any of claims 1 to 5.
CN202311482498.5A 2023-11-08 2023-11-08 Off-grid photovoltaic power station control method and device, electronic equipment and medium Pending CN117559522A (en)

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