CN116565857A - Method for determining installation quantity of household photovoltaic modules, household photovoltaic system and medium - Google Patents
Method for determining installation quantity of household photovoltaic modules, household photovoltaic system and medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 66
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- 230000000694 effects Effects 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 14
- 238000004590 computer program Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 7
- 238000010248 power generation Methods 0.000 description 7
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
- H02J2310/12—The local stationary network supplying a household or a building
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the technical field of photovoltaic control, in particular to a method for determining the installation quantity of household photovoltaic modules, a household photovoltaic system and a medium. The method comprises the following steps: acquiring a load curve associated with a transformer, and recording a historical load minimum value in each historical load value in a preset time interval; determining the current downlink power of the transformer according to the rated uplink power of the transformer and the historical load minimum value; and determining the corresponding maximum installation quantity of the household photovoltaic modules under the transformer based on the current downlink power. Because the offset of the load to the power in the photovoltaic system is considered, the obtained maximum installation number is larger than the original maximum installation number determined based on rated power, and the effect of improving the installation rate of the household photovoltaic module under the transformer is achieved while the transformer is not damaged. The problem of how to promote the installation rate of domestic photovoltaic module under same transformer is solved.
Description
Technical Field
The invention relates to the technical field of photovoltaic control, in particular to a method for determining the installation quantity of household photovoltaic modules, a household photovoltaic system and a medium.
Background
In the field of domestic photovoltaic power generation, in order to avoid damage to a transformer caused by excessive installation quantity of a domestic photovoltaic module, the installation capacity of the domestic photovoltaic module under the same transformer cannot be higher than the rated uplink power of the transformer. For example, the maximum output power of a household photovoltaic module is typically 40KM, while the rated up power of a transformer is 200KW, thus not allowing more than 5 users to install the household photovoltaic module.
However, a transformer is typically configured for 40 to 50 users. That is, the installation rate of the household photovoltaic module under one transformer can only account for about 10% of the total number of users, which can certainly limit the installation and popularization of the household photovoltaic module.
The inventor conception and realization of the present application found that: in the noon time period with the strongest solar illumination, namely, when the photovoltaic module is in a power generation state with the maximum output power, the actual output power of the photovoltaic module is lower than the theoretical maximum output power due to loss, so that the uplink power of the photovoltaic module end actually reaches the transformer end and is lower than the downlink power of all inverters under the transformer. Based on this phenomenon, the number of photovoltaic modules that can be mounted on one transformer is larger than the theoretical number of mounting calculated from the rated uplink power of the transformer and the theoretical maximum output power of the photovoltaic modules. Therefore, a new method for determining the installation number of photovoltaic modules is needed, so that the number of the household photovoltaic modules which can be installed under one transformer is accurately calculated, and the installation rate of the household photovoltaic modules under the same transformer is improved.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a method for determining the installation quantity of household photovoltaic modules, which aims to solve the problem of how to improve the installation rate of the household photovoltaic modules under the same transformer.
In order to achieve the above object, the present invention provides a method for determining the installation number of a household photovoltaic module, the method comprising:
acquiring a load curve associated with a transformer, and recording a historical load minimum value in each historical load value in a preset time interval;
determining the current downlink power of the transformer according to the rated uplink power of the transformer and the historical load minimum value;
and determining the corresponding maximum installation quantity of the household photovoltaic modules under the transformer based on the current downlink power.
Optionally, after the step of determining the maximum installation number of the household photovoltaic module corresponding to the transformer based on the current downlink power, the method further includes:
acquiring the current uplink power of the transformer;
determining a power ratio between the current uplink power and the rated uplink power;
When the power ratio is larger than a preset safety coefficient threshold value, controlling an inverter to adjust output power based on a preset rule so that the ratio is smaller than or equal to the safety coefficient threshold value;
otherwise, maintaining the current output power of the inverter.
Optionally, the inverter is plural, and the step of controlling the inverter to adjust the output power based on a preset rule includes:
selecting a target inverter with output power larger than a preset output power threshold value from the inverters, and controlling the target inverter to operate according to the output power threshold value; or alternatively, the process may be performed,
determining a numerical value difference between the current uplink power and the minimum value of the historical load, determining target output power of the inverters according to the numerical value difference, and controlling each inverter to operate according to the target output power, wherein the numerical value difference and the target output power are in negative correlation; or alternatively, the process may be performed,
and determining a target output regulation proportion of the inverters according to the power ratio, determining target output power of each inverter according to the current output power of the inverters and the target output regulation proportion, and controlling each inverter to operate according to the target output power, wherein the target output power is smaller than the current output power of each inverter.
Optionally, the determining the target output power of the inverter according to the numerical difference includes:
determining the target output power according to the numerical value difference and a numerical value mapping relation between the preset numerical value difference and the output power; or alternatively, the process may be performed,
and determining a corresponding target adjustment proportion of the numerical difference in a preset power adjustment interval, and determining the target output power according to the product of the current output power of the inverter and the target adjustment proportion.
Optionally, the determining the target output regulation proportion of the inverter according to the power ratio comprises:
when the power ratio is larger than the interval upper limit value of a preset power ratio interval, determining an output regulation proportion corresponding to the interval upper limit value as the target output regulation proportion;
when the power ratio is in the preset power ratio interval, determining an output regulation proportion corresponding to the power ratio in the power ratio interval as the target output regulation proportion;
and when the power ratio is smaller than the interval lower limit value of the preset power ratio interval, determining the output regulation proportion corresponding to the interval lower limit value as the target output regulation proportion.
Optionally, the step of obtaining a load curve associated with the transformer, and the historical load minimum value in each historical load value recorded in the preset time interval includes:
acquiring an annual load curve associated with a transformer, and recording a historical load minimum value in each historical load value in an annual time interval; or alternatively, the process may be performed,
and acquiring a target quarter load curve associated with the transformer, and recording a historical load minimum value in each historical load value in a quarter time interval.
Optionally, the step of obtaining a target quarter load curve associated with the transformer, and the historical load minimum value in each historical load value recorded in the quarter duration interval includes:
determining the current quarter according to the recorded date data;
determining a target quarter load curve from a plurality of quarter load curves according to the current quarter;
and acquiring a historical load minimum value of the target quarter load curve in each historical load value recorded in the quarter time period interval.
Optionally, the step of determining the current downlink power of the transformer according to the rated uplink power of the transformer and the historical load minimum value includes:
Obtaining the current downlink power according to the sum result of the rated uplink power and the historical load minimum value; or alternatively, the process may be performed,
and determining the current downlink power corresponding to the rated uplink power and the historical load minimum value based on a preset relation.
Optionally, the step of determining the maximum installation number of the household photovoltaic module corresponding to the transformer based on the current downlink power includes:
determining the maximum installation quantity according to the ratio of the current downlink power to the rated power of the household photovoltaic module; or alternatively, the process may be performed,
and determining an installation increment according to the current downlink power and the rated uplink power, and determining the maximum installation quantity according to the installation increment and the initial installation quantity determined based on the rated uplink power.
Optionally, determining a string output power of each of the domestic photovoltaic modules based on the maximum number of installations;
determining the super-matching proportion of the household photovoltaic module according to the ratio of the output power of the string and the maximum input power of the inverter;
determining whether the superstration example is smaller than a preset superstration threshold value;
if the number is smaller than the preset number, outputting an installation permission prompt.
In addition, to achieve the above object, the present invention also provides a home photovoltaic system including: the method comprises the steps of a photovoltaic module, a plurality of inverters, a transformer, a data collector, a controller, a memory, a processor and a household photovoltaic module installation quantity determining program which is stored in the memory and can run on the processor, wherein the household photovoltaic module installation quantity determining program is executed by the processor to realize the household photovoltaic module installation quantity determining method.
In addition, in order to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon an installation number determining program of a household photovoltaic module, which when executed by a processor, implements the steps of the installation number determining method of a household photovoltaic module as described above.
The embodiment of the invention provides a method for determining the installation quantity of a household photovoltaic module, a household photovoltaic system and a medium, wherein the actual downlink power of the transformer in the current state is calculated through a historical load minimum value in each historical load value recorded in a preset time interval by a load curve associated with the transformer and the rated uplink power of the transformer, and the corresponding maximum installation quantity of the household photovoltaic module under the transformer is calculated based on the current downlink power. Because the offset of the load to the power in the photovoltaic system is considered, the obtained maximum installation quantity is generally larger than the original maximum installation quantity which is originally determined based on rated power, and the exceeding quantity value cannot cause loss to the photovoltaic system or the loss degree is in an acceptable range, so that the quantity of the household photovoltaic modules which can be installed under one transformer is accurately calculated, and the effect of improving the installation rate of the household photovoltaic modules under the transformer is achieved.
Drawings
FIG. 1 is a schematic architecture diagram of a hardware operating environment of a home photovoltaic system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a household photovoltaic system of the present invention;
FIG. 3 is a flow chart of a first embodiment of a method for determining the number of installed photovoltaic modules in a home according to the present invention;
FIG. 4 is a flow chart of a second embodiment of the method for determining the number of installed photovoltaic modules in a home of the present invention;
fig. 5 is a flowchart of a third embodiment of the method for determining the installation number of the home photovoltaic module according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
According to the method, the actual downlink power of the transformer in the current state is calculated through the historical load minimum value in each historical load value recorded in the preset time interval of the load curve associated with the transformer and the rated uplink power of the transformer, and the corresponding maximum installation quantity of the photovoltaic modules in the home is calculated based on the current downlink power. Because the offset of the load to the power in the photovoltaic system is considered, the obtained maximum installation quantity is generally larger than the original maximum installation quantity which is originally determined based on rated power, and the exceeding quantity value cannot cause loss to the photovoltaic system or the loss degree is in an acceptable range, so that the quantity of the household photovoltaic modules which can be installed under one transformer is accurately calculated, and the effect of improving the installation rate of the household photovoltaic modules under the transformer is achieved.
In order to better understand the above technical solution, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As an implementation scheme, fig. 1 is a schematic architecture diagram of a hardware running environment of a home photovoltaic system according to an embodiment of the present invention.
As shown in fig. 1, the home photovoltaic system may include: a processor 1001, such as a CPU, memory 1005, user interface 1003, network interface 1004, communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
Those skilled in the art will appreciate that the architecture of the home photovoltaic system shown in fig. 1 is not limiting of the home photovoltaic system and may include more or fewer components than shown, or certain components in combination, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and an installation number determination program of the home photovoltaic module may be included in the memory 1005 as one type of storage medium. The operating system is a program for managing and controlling hardware and software resources of the household photovoltaic system, and an installation quantity determining program of the household photovoltaic module and other software or running of the program.
In the home photovoltaic system shown in fig. 1, the user interface 1003 is mainly used for connecting a terminal, and is in data communication with the terminal; the network interface 1004 is mainly used for a background server and is in data communication with the background server; the processor 1001 may be used to invoke the installation number determination program of the home photovoltaic modules stored in the memory 1005.
In this embodiment, a home photovoltaic system includes: a memory 1005, a processor 1001, and an installation number determination program of the home photovoltaic modules stored on the memory and executable on the processor, wherein:
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
acquiring a load curve associated with a transformer, and recording a historical load minimum value in each historical load value in a preset time interval;
determining the current downlink power of the transformer according to the rated uplink power of the transformer and the historical load minimum value;
and determining the corresponding maximum installation quantity of the household photovoltaic modules under the transformer based on the current downlink power.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
acquiring the current uplink power of the transformer;
determining a power ratio between the current uplink power and the rated uplink power;
when the power ratio is larger than a preset safety coefficient threshold value, controlling an inverter to adjust output power based on a preset rule so that the ratio is smaller than or equal to the safety coefficient threshold value;
otherwise, maintaining the current output power of the inverter.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
Selecting a target inverter with output power larger than a preset output power threshold value from the inverters, and controlling the target inverter to operate according to the output power threshold value; or alternatively, the process may be performed,
determining a numerical value difference between the current uplink power and the minimum value of the historical load, determining target output power of the inverters according to the numerical value difference, and controlling each inverter to operate according to the target output power, wherein the numerical value difference and the target output power are in negative correlation; or alternatively, the process may be performed,
and determining a target output regulation proportion of the inverters according to the power ratio, determining target output power of each inverter according to the current output power of the inverters and the target output regulation proportion, and controlling each inverter to operate according to the target output power, wherein the target output power is smaller than the current output power of each inverter.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
determining the target output power according to the numerical value difference and a numerical value mapping relation between the preset numerical value difference and the output power; or alternatively, the process may be performed,
And determining a corresponding target adjustment proportion of the numerical difference in a preset power adjustment interval, and determining the target output power according to the product of the current output power of the inverter and the target adjustment proportion.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
when the power ratio is larger than the interval upper limit value of a preset power ratio interval, determining an output regulation proportion corresponding to the interval upper limit value as the target output regulation proportion;
when the power ratio is in the preset power ratio interval, determining an output regulation proportion corresponding to the power ratio in the power ratio interval as the target output regulation proportion;
and when the power ratio is smaller than the interval lower limit value of the preset power ratio interval, determining the output regulation proportion corresponding to the interval lower limit value as the target output regulation proportion.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
acquiring an annual load curve associated with a transformer, and recording a historical load minimum value in each historical load value in an annual time interval; or alternatively, the process may be performed,
And acquiring a target quarter load curve associated with the transformer, and recording a historical load minimum value in each historical load value in a quarter time interval.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
determining the current quarter according to the recorded date data;
determining a target quarter load curve from a plurality of quarter load curves according to the current quarter;
and acquiring a historical load minimum value of the target quarter load curve in each historical load value recorded in the quarter time period interval.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
determining the current quarter according to the recorded date data;
determining a target quarter load curve from a plurality of quarter load curves according to the current quarter;
and acquiring a historical load minimum value of the target quarter load curve in each historical load value recorded in the quarter time period interval.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
Determining the maximum installation quantity according to the ratio of the current downlink power to the rated power of the household photovoltaic module; or alternatively, the process may be performed,
and determining an installation increment according to the current downlink power and the rated uplink power, and determining the maximum installation quantity according to the installation increment and the initial installation quantity determined based on the rated uplink power.
When the processor 1001 calls the installation number determination program of the home photovoltaic module stored in the memory 1005, the following operations are performed:
determining the string output power of each household photovoltaic module based on the maximum installation quantity;
determining the super-matching proportion of the household photovoltaic module according to the ratio of the output power of the string and the maximum input power of the inverter;
determining whether the superstration example is smaller than a preset superstration threshold value;
if the number is smaller than the preset number, outputting an installation permission prompt.
Based on the hardware architecture of the household photovoltaic system based on the photovoltaic control technology, the embodiment of the method for determining the installation quantity of the household photovoltaic modules is provided.
Referring to fig. 2, fig. 2 is a schematic diagram of a home photovoltaic system architecture in an alternative embodiment, the home photovoltaic system is composed of a photovoltaic module, a plurality of inverters, a transformer, a data collector and a controller.
The photovoltaic module is used for converting solar energy into electric energy. Each photovoltaic module consists of a plurality of solar panels, and a panel group is formed in a parallel or serial mode. The output power of the photovoltaic module depends on the intensity of the solar energy and the quality of the photovoltaic module.
The inverter is used for converting direct current generated by the photovoltaic module into alternating current for power supply. Multiple inverters are required in a domestic photovoltaic system because the ac power in the grid needs to be synchronized in phase with the ac power output by the inverters. In addition, the inverter is also responsible for monitoring the system operation state and protecting the system safety.
The transformer is used for boosting or reducing the alternating voltage output by the inverter so as to adapt to the voltage requirement of the power grid.
The data collector is used for monitoring the running state of the household photovoltaic system, including the output power of the photovoltaic module, the working state of the inverter, the voltage and current of the power grid and the like. The data collector transmits the collected data to the controller.
The controller is used for controlling and managing the household photovoltaic system according to the data transmitted by the data acquisition device, and comprises starting and stopping of the inverter, voltage rising and falling of the transformer, positioning adjustment of the photovoltaic module and the like. The controller may also display the operating status of the system and issue an alarm.
In the power generation process of the photovoltaic module, data are uploaded to an inverter, and the inverter is transmitted to a transformer; the system comprises a data acquisition device, a controller and a control device in the inverter, wherein the control device is used for monitoring, controlling and protecting a household photovoltaic system.
In general, the installation capacity of a household photovoltaic module under the same transformer cannot be higher than the rated uplink power of the transformer, for example, the maximum output power of one household photovoltaic module is usually 40KM, and the rated uplink power of one transformer is 200KW, so that more than 5 users are not allowed to install the household photovoltaic module.
For the photovoltaic system, when the highest value of the photovoltaic output electric quantity exists in the midday period, the load is obviously generated, and the load is generated in the process that the household electric quantity is used by users in the region, namely, part of the output electric quantity of the photovoltaic power generation in the daytime is counteracted by the load, so that the actual uplink power to the transformer end is smaller than the total output power of all inverters under the transformer, and therefore, the total output power of all inverters under the transformer is divided by the rated uplink power of the transformer, and the installation quantity of the obtained household photovoltaic modules is more than that determined according to the rated uplink power of the transformer and the rated power of the photovoltaic modules.
Referring to fig. 3, in a first embodiment, the method for determining the installation number of the home photovoltaic modules includes the steps of:
step S10, acquiring a load curve associated with a transformer, and recording a historical load minimum value in each historical load value in a preset time interval;
in this embodiment, firstly, a historical load minimum value in each historical load value recorded in a certain duration of a load curve associated with a transformer is obtained from a data collector of a household photovoltaic system.
The load curve is a curve formed by load values of the transformer at each historical moment of the transformer acquired by an ammeter in the data acquisition device in a past period of time, wherein the abscissa of the load curve is the moment, and the ordinate is the load value. Alternatively, the historical time may be recorded every other hour. Alternatively, the load profile may be an annual load profile, a quarterly load profile. The annual load curve is a curve formed by characteristic changes of load values at each historical time within one year from the current time, and is recorded in units of years. The quarter load curve is a curve formed according to the change rule of the load values of the transformer under the sun illumination of four different seasons, namely, the quarter load curve of 3 months to 5 months per year is a spring load curve, the quarter load curve of 6 months to 8 months per year is a summer load curve, the quarter load curve of 9 months to 11 months per year is a autumn load curve, and the quarter load curve of 12 months to 2 months per year is a winter load curve.
The preset duration interval can be selected according to different load curves.
Optionally, if the load curve is an annual load curve, the preset duration interval is an annual duration interval, that is, the current time is taken as the interval start point, the time interval of one year is taken as the interval end point, and the duration interval is taken as the duration interval. For example, when the current time is 12 am in the nth year, the duration interval takes 12 am in the nth year, the mth and the mth, to 12 am in the mth and the mth, and the load value is recorded in the duration interval.
Optionally, if the load curve is a quarter load curve, the preset duration interval is a quarter duration interval. That is, the corresponding quarter load curve is selected according to the quarter in which the date in the current time is located. For example, when the date of the current moment is 5 months, the corresponding quarter load curve is determined to be a spring load curve.
The historical load minimum is characterized as the minimum in the load curve within the preset time interval.
It should be noted that, the purpose of selecting the minimum value in a certain section in the curve as the subsequent downstream power of the transformer and calculating the installation number is that the minimum load value of the historical load corresponds to the minimum load value in the period, and the target installation number determined based on the minimum load value is larger than the installation number calculated according to the rated power of both the transformer and the household photovoltaic module, so that the target installation number is multiplied by the rated power of the household photovoltaic module, the obtained total input power exceeds the rated power of the transformer, but the exceeding part is allowed to exceed by considering the power offset caused by the load of the photovoltaic module, and the damage to the circuit of the photovoltaic system is not caused, or the damage degree is in an acceptable range. In addition, as the illumination intensity changes, the load value of the transformer also changes within a period of time (usually several days to several months), and when the illumination intensity increases, the load value increases, so that theoretically, the offset power is more, and the number of the household photovoltaic modules allowed to be installed is also more. Therefore, the minimum value of the load value recorded in the period of time is selected as the subsequent maximum installation number calculation amount, the illumination is considered to be weaker in the period of time, the load value of the transformer is not lower than the historical load minimum value, the exceeding power is allowed based on the counteraction of the load value, and the exceeding safety range allowed by the photovoltaic system is not exceeded.
Step S20, determining the current downlink power of the transformer according to the rated uplink power of the transformer and the historical load minimum value;
in this embodiment, according to the rated uplink power of the transformer and the historical load minimum value obtained in the previous step, the current downlink power is calculated by inputting the rated uplink power of the transformer into a downlink power calculation module in a controller of the photovoltaic system. The rated uplink power of the transformer may be determined according to the model of the transformer, or the rated uplink power of the transformer previously recorded in the data collector may be directly obtained.
As an alternative embodiment, the current downlink power may be obtained according to the sum of the rated uplink power and the historical load minimum.
Illustratively, assuming that the solar irradiation degree is maximum in the recent 4 days of noon in the historical load data, the corresponding load power is as follows:
| Time | load power (KW) |
| 2023-05-01-12：00 | 120 |
| 2023-05-02-13：00 | 150 |
| 2023-05-03-13：15 | 130 |
| 2023-05-04-12：45 | 110 |
And determining that the minimum historical load is 110KW, and setting the rated uplink power of the transformer to be 200KW, wherein the current downlink power is 110KW+220KW=310 KW.
As another alternative embodiment, the rated uplink power and the historical load minimum value may be used as input quantities, and the current downlink power of the transformer may be determined based on a preset relationship between the rated uplink power and the historical load minimum value and the downlink power.
For example, assuming that the relationship between the downstream power and the rated upstream power and the historical load minimum value according to the preset relationship can be expressed as:
downstream power = nominal upstream power + historical load minima coefficient
The coefficient is a preset constant for adjusting the influence of the minimum historical load on the downlink power.
Assuming a rated uplink power of 200KW, the historical load data is as follows:
| Time | load power (KW) |
| 2023-05-01-12：00 | 120 |
| 2023-05-02-13：00 | 150 |
| 2023-05-03-13：15 | 130 |
| 2023-05-04-12：45 | 110 |
The coefficient was set to 0.8.
First, a minimum value in the history load data, i.e., 110KW, is found.
Then, calculating downlink power=200+110×0.8=288 KW according to a preset relation
According to the given rated uplink power and the historical load minimum value, the current downlink power of the transformer can be determined to be 288KW based on a preset relation.
And step S30, determining the maximum installation number corresponding to the household photovoltaic module based on the current downlink power.
In this embodiment, after the current downlink power is obtained, the current downlink power is input to an installation number calculation module in a controller of the photovoltaic system, and the maximum installation number allowed under the transformer of the type of the household photovoltaic module of the type is calculated.
As an alternative embodiment, the determination of the maximum installation number may be that the maximum installation number is determined according to the ratio of the current downlink power and the rated power of the domestic photovoltaic module, and if the ratio is a non-integer, the rounding is used as the maximum installation number.
By way of example, assuming the current downstream power is p_down and the rated power of the domestic photovoltaic module is p_pv, the maximum installation number n_max may be determined as follows:
N_max＝floor(P_down/P_pv)
wherein floor () represents a rounding down.
If p_down=250w, p_pv=50w, then n_max=floor (250/50) =5, i.e. up to 5 domestic photovoltaic modules can be installed.
If p_down=256W, p_pv=50w, then n_max=floor (256/50) =5, i.e. up to 5 domestic photovoltaic modules can be installed.
As another alternative embodiment, the determination of the maximum installation number may be that an installation increment is determined according to a ratio between the current downlink power and the rated uplink power, and the maximum installation number is determined according to the installation increment and an initial installation number determined based on the rated uplink power.
Illustratively, assuming that the current downstream power of the transformer is p_down=330W and the rated power of the transformer is p_bv=220W, the initial installation number n=4 determined based on the rated upstream power recorded in the memory of the photovoltaic system is obtained.
Calculating the ratio between the current downlink power and the rated power, namely, mounting increment P:
multiplying n=4 by the installation increment p=1.5 to calculate the maximum installation number p=6;
Namely, the maximum installation number of the household photovoltaic modules which can be installed under the current uplink power of the transformer is 6.
In the technical scheme provided by the embodiment, the actual downlink power of the transformer in the current state is calculated through the historical load minimum value in each historical load value recorded in the preset duration interval of the load curve associated with the transformer and the rated uplink power of the transformer, and the corresponding maximum installation number of the photovoltaic modules in the home under the transformer is calculated based on the current downlink power. Because the offset of the load to the power in the photovoltaic system is considered, the obtained maximum installation quantity is generally larger than the original maximum installation quantity which is originally determined based on rated power, and the exceeding quantity value cannot cause loss to the photovoltaic system or the loss degree is in an acceptable range, so that the quantity of the household photovoltaic modules which can be installed under one transformer is accurately calculated, and the effect of improving the installation rate of the household photovoltaic modules under the transformer is achieved.
Referring to fig. 4, in the second embodiment, after step S30, based on any embodiment, the method further includes:
step S40, obtaining the current uplink power of the transformer;
Step S50, determining a power ratio between the current uplink power and the rated uplink power;
step S60, when the power ratio is larger than a preset safety coefficient threshold, controlling an inverter to adjust output power based on a preset rule so that the ratio is smaller than or equal to the safety coefficient threshold;
step S70, otherwise, maintaining the current output power of the inverter.
As an alternative embodiment, in this embodiment, when the maximum installation number of the domestic photovoltaic modules is determined based on the current downlink power of the transformer, if the domestic photovoltaic modules are configured based on the installation number, the transformer may have an oversubstance phenomenon, so as to protect the uplink power transmission safety of the whole transformer, in this embodiment, a scheme for controlling the output power of the inverter is provided, and by adjusting the output power of the inverter, the uplink power of the transformer is reduced, so that the total power generation power minus the total load of the photovoltaic system is ensured not to exceed the rated uplink power of the transformer.
Specifically, for how to control the output power of the inverter, common control methods are to adjust the input voltage on the transformer, frequency response control, and MPPT (Maximum Power Point Tracking ) control. For regulating the dc input voltage, the output power of the inverter is related to its dc input voltage. By adjusting the dc input voltage, the output power of the inverter can be controlled. Decreasing the input voltage may decrease the output power of the inverter, and increasing the input voltage may increase the output power of the inverter. For frequency response control, the output power of the inverter may also be controlled by the response to the input grid frequency. When the grid frequency changes, the inverter may adjust its output power in response to the grid demand, for example by engaging in frequency regulation, active power control, and the like. For MPPT control, in the photovoltaic inverter, the working state of the inverter is adjusted by tracking the current maximum power point of the photovoltaic array, so that the inverter outputs the maximum power. The MPPT control can be optimized according to parameters such as real-time solar radiation and temperature, so as to achieve optimal power conversion efficiency.
In this embodiment, the current uplink power of the transformer is obtained first, and the current uplink power P of the transformer can be calculated by setting a voltage and current acquisition device on the uplink side of the transformer and then inputting the voltage and current acquisition device to a calculation module in a controller of the photovoltaic system Upper 1 . Then, the current uplink power P is calculated in the calculation module Upper 1 And rated upstream power P of transformer e on Power ratio gamma between 1 ；
Will gamma 1 With a preset safety protection coefficient gamma 0 In contrast, when the power ratio gamma 1 Greater than gamma 0 When the total power generation power minus the total load of the photovoltaic system exceeds the rated uplink power of the transformer, the inverter is controlled to adjust the output power based on a certain preset rule so as to enable the ratio gamma 1 Less than or equal to the safety coefficient threshold gamma 0 Wherein, when the power ratio gamma 1 Is equal to the safety coefficient threshold gamma 0 In this case, the power loss in the regulation of the inverter is minimized, so that the power ratio is brought as close to the safety factor threshold as possible in the subsequent regulation.
Furthermore, if the power ratio gamma 1 Less than or equal to gamma 0 The current output power of the inverter is maintained.
As an alternative embodiment, how to adjust the inverter output power based on preset rules, it may be possible to select a number of inverters from the respective inverters that meet the conditions. Specifically, an inverter with an output power greater than a preset output power threshold may be selected for control, and the output power of the inverter exceeding the threshold is controlled to operate at the preset output power threshold, so as to reduce the loss of the output power of the inverter to a minimum extent.
As an alternative embodiment, it can also be based on the current uplink power P Upper 1 And the value difference between the historical load minima to make real-time adjustments to the inverter. The larger the numerical difference between the two is, the larger the generated power of the photovoltaic system is, the larger the output power value of the inverter to be reduced is, and the smaller the target output power of the obtained inverter is.
Optionally, the target output power of the inverter is determined with respect to how the value difference is based. The obtained numerical value difference can be input into a numerical value mapping relation function between a preset numerical value difference and output power to directly obtain the target output power corresponding to the numerical value difference.
Or searching a target adjustment proportion corresponding to the numerical value difference in a preset power adjustment interval, and multiplying the current output power of the inverter by the target adjustment proportion to calculate the target output power corresponding to the numerical value difference.
Illustratively, it is assumed that we have a preset power adjustment interval of [ -10%, +10% ], i.e., the output power of the inverter can be adjusted within plus or minus 10% of the current output power. Let us assume that the current output power of the inverter is 100kW and we get a value difference of-5.
And searching a corresponding target adjustment proportion of the numerical value difference in a preset power adjustment interval. According to the preset power adjustment interval, when the numerical value difference is-5, the corresponding target adjustment proportion is 5%.
Then, the current output power of the inverter is multiplied by the target adjustment ratio to calculate a target output power:
target output power = current output power x 1-target adjustment ratio i
Target output power=100 kW 1-5% i=100 kW (0.95) =95 kW)
Therefore, according to the target adjustment proportion corresponding to the found value difference in the preset power adjustment interval and multiplying the current output power of the inverter by the target adjustment proportion, the target output power corresponding to the value difference of-5 can be calculated to be 95kW.
Alternatively, how to determine the target output power of the inverter according to the numerical difference may also be that the target output adjustment proportion of the inverter is determined according to the magnitude of the power ratio between the current uplink power and the rated uplink power, and the target output power of each inverter is determined according to the current output power and the target output adjustment proportion of the inverter.
Further, when the power ratio is greater than a section upper limit value of a preset power ratio section, determining an output adjustment ratio corresponding to the section upper limit value as the target output adjustment ratio; when the power ratio is in the preset power ratio interval, determining an output regulation proportion corresponding to the power ratio in the power ratio interval as the target output regulation proportion; and when the power ratio is smaller than the interval lower limit value of the preset power ratio interval, determining the output regulation proportion corresponding to the interval lower limit value as the target output regulation proportion.
Illustratively, assume that the preset power ratio interval is 0.8 to 1.2, and we have a set of output adjustment ratios versus power ratio mappings as follows:
| power ratio | Output regulation ratio |
| 0.8 | 0.95 |
| 0.9 | 1.0 |
| 1.0 | 1.05 |
| 1.1 | 1.1 |
| 1.2 | 1.15 |
If the power ratio is greater than the upper limit value of the preset power ratio interval (i.e., greater than 1.2), the target output adjustment ratio is 1.15 (the output adjustment ratio corresponding to the upper limit value of the interval).
If the power ratio is within a preset power ratio interval (i.e., between 0.8 and 1.2), the target output adjustment ratio is determined according to the output adjustment ratio corresponding to the power ratio in the power ratio interval.
If the power ratio is less than the interval lower limit value (i.e., less than 0.8) of the preset power ratio interval, the target output adjustment ratio is 0.95 (the output adjustment ratio corresponding to the interval lower limit value).
Assuming that the current upstream power of the transformer is 80kW, the rated upstream power is 100kW,
power ratio = current uplink power/rated uplink power;
i.e. power ratio = 80kW/100kW = 0.8
In this case, the power ratio is 0.8, which is in the preset power ratio interval. And according to the corresponding output regulation proportion of the power ratio in the power ratio interval, the target output regulation proportion is 0.95.
Finally, a target output power=80 kw×0.95=76 kW of the inverter is determined according to the current output power and the target output regulation ratio of the inverter.
In the technical scheme provided by the embodiment, after the photovoltaic modules are installed for protecting the installation quantity determined based on the downlink power of the transformer, the total power generation power minus the total load of the photovoltaic system is ensured not to exceed the rated uplink power of the transformer, the output power of the inverter is regulated through the rules, the uplink power of the transformer is reduced, the power ratio between the current uplink power and the uplink power is ensured not to be below the safety coefficient threshold for a long time, the long-term effective safe operation of the photovoltaic system is ensured, and the safety guarantee is provided for increasing the installation rate of the photovoltaic modules under the same transformer.
Referring to fig. 5, in a third embodiment, before step S30, based on any embodiment, the method further includes:
step S80, determining the string output power of each household photovoltaic module based on the maximum installation quantity;
step S90, determining the superfluous proportion of the household photovoltaic module according to the ratio of the output power of the string and the maximum input power of the inverter;
Step S100, determining whether the supermatch case is smaller than a preset supermatch threshold;
in step S110, if it is smaller than the predetermined value, and outputting an installation permission prompt.
As an alternative implementation manner, in this example, considering the matching requirement between the string output power of the domestic photovoltaic module and the maximum input power of the transformer, it is further required to determine whether the super-matching ratio of the domestic photovoltaic module obtained based on the maximum installation number is smaller than a preset super-matching threshold, where the super-matching threshold is a super-matching threshold that is specified by the relevant department and allows the domestic photovoltaic system. Illustratively, the current allowable super-match is 1.8:1.
in this embodiment, in the calculation module of the photovoltaic system controller, the maximum installation number is multiplied by the rated output power of the domestic photovoltaic module to obtain the string output power of the domestic photovoltaic module, the calculation module divides the string output power by the maximum input power ratio of the inverter to obtain the super-matching ratio of the domestic photovoltaic module of the model, and the super-matching ratio data is input into the judgment module to judge whether the super-matching ratio data exceeds the super-matching threshold, if the super-matching ratio data exceeds the super-matching threshold, an installation permission prompt is output to prompt that an installer can install the domestic photovoltaic module with the current maximum installation number, and the relevant department regulations cannot be violated.
In the technical scheme provided in the embodiment, the ratio between the string output power of the household photovoltaic module corresponding to the maximum installation number determined based on the current downlink power of the transformer and the maximum input power of the inverter is calculated in consideration of the super-proportioning threshold value of the allowable household photovoltaic system specified by the related departments, whether the super-proportioning is smaller than the super-proportioning threshold value is determined, and if so, a prompt person can install the super-proportioning threshold value, so that the feasibility of increasing the installation rate of the photovoltaic module under the same transformer is further improved.
Furthermore, it will be appreciated by those of ordinary skill in the art that implementing all or part of the processes in the methods of the above embodiments may be accomplished by computer programs to instruct related hardware. The computer program comprises program instructions, and the computer program may be stored in a storage medium, which is a computer readable storage medium. The program instructions are executed by at least one processor in the home photovoltaic system to implement the flow steps of the embodiments of the method described above.
Accordingly, the present invention also provides a computer-readable storage medium storing an installation number determination program of a home photovoltaic module, which when executed by a processor, implements the respective steps of the installation number determination method of a home photovoltaic module as described in the above embodiments.
The computer readable storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, etc. which may store the program code.
It should be noted that, because the storage medium provided in the embodiments of the present application is a storage medium used to implement the method in the embodiments of the present application, based on the method described in the embodiments of the present application, a person skilled in the art can understand the specific structure and the modification of the storage medium, and therefore, the description thereof is omitted herein. All storage media used in the methods of the embodiments of the present application are within the scope of protection intended in the present application.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (12)
1. The method for determining the installation quantity of the household photovoltaic modules is characterized by comprising the following steps of:
acquiring a load curve associated with a transformer, and recording a historical load minimum value in each historical load value in a preset time interval;
determining the current downlink power of the transformer according to the rated uplink power of the transformer and the historical load minimum value;
and determining the corresponding maximum installation quantity of the household photovoltaic modules under the transformer based on the current downlink power.
2. The method for determining the installation number of the household photovoltaic modules according to claim 1, wherein after the step of determining the corresponding maximum installation number of the household photovoltaic modules under the transformer based on the current downlink power, the method further comprises:
acquiring the current uplink power of the transformer;
determining a power ratio between the current uplink power and the rated uplink power;
when the power ratio is larger than a preset safety coefficient threshold value, controlling an inverter to adjust output power based on a preset rule so that the ratio is smaller than or equal to the safety coefficient threshold value;
otherwise, maintaining the current output power of the inverter.
3. The method for determining the installation number of the photovoltaic modules according to claim 2, wherein the inverter is plural, and the step of controlling the inverter to adjust the output power based on a preset rule includes:
selecting a target inverter with output power larger than a preset output power threshold value from the inverters, and controlling the target inverter to operate according to the output power threshold value; or alternatively, the process may be performed,
determining a numerical value difference between the current uplink power and the minimum value of the historical load, determining target output power of the inverters according to the numerical value difference, and controlling each inverter to operate according to the target output power, wherein the numerical value difference and the target output power are in negative correlation; or alternatively, the process may be performed,
And determining a target output regulation proportion of the inverters according to the power ratio, determining target output power of each inverter according to the current output power of the inverters and the target output regulation proportion, and controlling each inverter to operate according to the target output power, wherein the target output power is smaller than the current output power of each inverter.
4. The method for determining the installation number of the photovoltaic modules for home use according to claim 3, wherein the determining the target output power of the inverter according to the numerical value difference comprises:
determining the target output power according to the numerical value difference and a numerical value mapping relation between the preset numerical value difference and the output power; or alternatively, the process may be performed,
and determining a corresponding target adjustment proportion of the numerical difference in a preset power adjustment interval, and determining the target output power according to the product of the current output power of the inverter and the target adjustment proportion.
5. The method for determining the installation number of the photovoltaic modules according to claim 3, wherein the determining the target output adjustment ratio of the inverter according to the power ratio comprises:
When the power ratio is larger than the interval upper limit value of a preset power ratio interval, determining an output regulation proportion corresponding to the interval upper limit value as the target output regulation proportion;
when the power ratio is in the preset power ratio interval, determining an output regulation proportion corresponding to the power ratio in the power ratio interval as the target output regulation proportion;
and when the power ratio is smaller than the interval lower limit value of the preset power ratio interval, determining the output regulation proportion corresponding to the interval lower limit value as the target output regulation proportion.
6. The method for determining the installation number of the household photovoltaic modules according to claim 1, wherein the step of obtaining the load curve associated with the transformer, and recording the minimum historical load value among the historical load values in the preset time interval comprises the steps of:
acquiring an annual load curve associated with a transformer, and recording a historical load minimum value in each historical load value in an annual time interval; or alternatively, the process may be performed,
and acquiring a target quarter load curve associated with the transformer, and recording a historical load minimum value in each historical load value in a quarter time interval.
7. The method for determining the installation number of the photovoltaic modules according to claim 6, wherein the step of obtaining the target quarter load curve associated with the transformer, and recording the minimum historical load value in each of the historical load values in the quarter time period interval comprises:
determining the current quarter according to the recorded date data;
determining a target quarter load curve from a plurality of quarter load curves according to the current quarter;
and acquiring a historical load minimum value of the target quarter load curve in each historical load value recorded in the quarter time period interval.
8. The method for determining the installation number of the photovoltaic modules according to claim 1, wherein the step of determining the current down power of the transformer according to the rated up power of the transformer and the historical load minimum value comprises:
obtaining the current downlink power according to the sum result of the rated uplink power and the historical load minimum value; or alternatively, the process may be performed,
and determining the current downlink power corresponding to the rated uplink power and the historical load minimum value based on a preset relation.
9. The method of determining the installation number of the household photovoltaic modules according to claim 1, wherein the step of determining the corresponding maximum installation number of the household photovoltaic modules under the transformer based on the current downlink power comprises:
Determining the maximum installation quantity according to the ratio of the current downlink power to the rated power of the household photovoltaic module; or alternatively, the process may be performed,
and determining an installation increment according to the current downlink power and the rated uplink power, and determining the maximum installation quantity according to the installation increment and the initial installation quantity determined based on the rated uplink power.
10. The method for determining the installation number of the household photovoltaic modules according to claim 1, wherein after the step of determining the corresponding maximum installation number of the household photovoltaic modules under the transformer based on the current downlink power, the method further comprises:
determining the string output power of each household photovoltaic module based on the maximum installation quantity;
determining the super-matching proportion of the household photovoltaic module according to the ratio of the output power of the string and the maximum input power of the inverter;
determining whether the superstration example is smaller than a preset superstration threshold value;
if the number is smaller than the preset number, outputting an installation permission prompt.
11. A home photovoltaic system, the home photovoltaic system comprising: photovoltaic module, a plurality of inverters, a transformer, a data collector, a controller, a memory, a processor and a household photovoltaic module installation number determining program stored on the memory and operable on the processor, which when executed by the processor, implements the steps of the household photovoltaic module installation number determining method according to any one of claims 1 to 10.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon an installation number determination program of a household photovoltaic module, which when executed by a processor, implements the steps of the installation number determination method of a household photovoltaic module according to any one of claims 1 to 10.
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