CN112907117B - Irradiance measuring method, irradiance measuring device and readable storage medium of photovoltaic power station - Google Patents
Irradiance measuring method, irradiance measuring device and readable storage medium of photovoltaic power station Download PDFInfo
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Abstract
The invention discloses an irradiance measuring and calculating method, a measuring and calculating device and a readable storage medium of a photovoltaic power station, wherein the irradiance measuring and calculating method of the photovoltaic power station comprises the following steps: dividing the region of the photovoltaic power station to obtain at least two power generation regions of the photovoltaic power station; acquiring current weather parameters of the photovoltaic power station and regional power generation power of each power generation region; according to the weather parameters and the power generated by each region, the calculated irradiance of each power generation region is obtained, and the accuracy of calculating the regional irradiance is improved.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to an irradiance measuring method, an irradiance measuring device and a readable storage medium of a photovoltaic power station.
Background
Because of the large area occupied by a large photovoltaic power plant, irradiance received by photovoltaic modules on different areas is inconsistent, even with large differences. As shown in fig. 9, there is a significant difference in correlation between irradiance data collected by a set of irradiance meters and the generated power of a photovoltaic power plant over different areas.
The existing large-scale photovoltaic power station is basically provided with one or more sets of irradiation monitors, so that irradiance monitored by the irradiation monitors cannot accurately represent irradiation conditions of different areas of the photovoltaic power station.
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 an irradiance measuring and calculating method, an irradiance measuring and calculating device and a readable storage medium of a photovoltaic power station, aiming at improving the measuring and calculating accuracy of regional irradiance.
In order to achieve the above object, the present invention provides a method for measuring irradiance of a photovoltaic power plant, the method for measuring irradiance of a photovoltaic power plant comprising the steps of:
dividing the region of the photovoltaic power station to obtain at least two power generation regions of the photovoltaic power station;
acquiring current weather parameters of the photovoltaic power station and regional power generation power of each power generation region;
and obtaining the calculated irradiance of each power generation area according to the weather parameters and the power generation power of each area.
Optionally, the step of obtaining the measured irradiance of each power generation area according to the weather parameter and the power generation power of each area includes:
acquiring current weather parameters of the photovoltaic power station, wherein the weather parameters comprise at least one of aerosol optical thickness, rayleigh scattering optical thickness and water vapor content;
acquiring a preset parameter interval corresponding to the weather parameter;
acquiring regional power generation power of each power generation region in the photovoltaic power station, wherein the power generation region comprises at least one photovoltaic group string;
and obtaining the measured irradiance of each power generation area according to the preset parameter interval and the power generation power of each power generation area.
Optionally, the step of obtaining the measured irradiance of each power generation area according to the weather parameter and the power generation power of each area includes:
inputting the weather parameters and the regional power generation power into an irradiance measuring model, wherein the irradiance measuring model measures regional irradiance of each power generation region according to the weather parameters and the regional power generation power of each power generation region;
and obtaining the regional irradiance of each power generation region measured by the irradiance measuring model.
Optionally, before the step of obtaining the current weather parameters of the photovoltaic power plant and the regional power generation power of each power generation region, the method further includes:
acquiring historical operation data of all photovoltaic group strings in the photovoltaic power station, wherein the historical operation data at least comprises historical power generation time and historical power generation power;
acquiring historical weather parameters and historical irradiation detection values of the photovoltaic power station at all moments;
acquiring an irradiance sub-measuring model of each power generation area according to each historical weather parameter, the historical irradiation detection value and the historical operation data;
and generating an irradiance measuring model of the photovoltaic power station according to each irradiance measuring model.
Optionally, the step of obtaining the irradiance sub-measurement model of each power generation area according to each of the historical weather parameters, the historical irradiation detection values, and the historical operation data further includes:
processing the historical power of each photovoltaic string according to the historical string temperature of the photovoltaic string to obtain target power of the photovoltaic string;
obtaining historical region power generation power of each power generation region according to target power generation of each photovoltaic group string in each power generation region;
acquiring historical region irradiance of each power generation region at each historical power generation time according to each irradiation detection value and each historical region power generation power;
acquiring a historical parameter interval corresponding to the historical weather parameter;
and obtaining an irradiance sub-measuring model of each power generation area according to each historical area power generation power, each historical area irradiance and each parameter interval.
Optionally, after the step of obtaining the measured irradiance of each power generation area according to the weather parameter and the power generation power of each area, the method further includes:
acquiring a preset deviation range of the power generation area corresponding to each calculated irradiance;
judging whether each calculated irradiance is located in a preset deviation range corresponding to the calculated irradiance;
when the calculated irradiance exceeds a preset deviation range, acquiring a fitting value corresponding to the regional power generation power, and taking the fitting value as corrected calculated irradiance;
when the calculated irradiance is in a preset deviation range, taking the current calculated irradiance as corrected calculated irradiance.
Optionally, before the step of obtaining the preset deviation range of the power generation area corresponding to the measured irradiance, the method further includes:
acquiring a preset number of historical region power generation powers and historical region irradiance;
generating an irradiance fitting curve of each power generation area according to the historical area power generation of each power generation area and the historical area irradiance;
and according to the fitting curve of each power generation area, a preset deviation range of each power generation area is obtained.
Optionally, after the step of obtaining the measured irradiance of each power generation area according to the weather parameter and the power generation power of each area, the method further includes:
and obtaining the calculated irradiance of the photovoltaic power station according to the calculated irradiance of each power generation area.
In addition, in order to achieve the above object, the present invention also provides a measuring and calculating device, including: the irradiance measuring device comprises a memory, a processor and an irradiance measuring program stored in the memory and capable of running on the processor, wherein the irradiance measuring program realizes the steps of the irradiance measuring method of the photovoltaic power station when being executed by the processor.
In addition, in order to achieve the above object, the present invention also proposes a readable storage medium having stored thereon an irradiance measuring program which, when executed by a processor, implements the steps of the irradiance measuring method of a photovoltaic power plant as described above.
According to the irradiance measuring and calculating method, the measuring and calculating device and the readable storage medium of the photovoltaic power station, the photovoltaic power station is firstly subjected to regional division to obtain at least two power generation regions of the photovoltaic power station, current weather parameters of the photovoltaic power station and regional power generation power of each power generation region are obtained, then measured and calculated irradiance of each power generation region is obtained according to the weather parameters and the regional power generation power, namely, irradiance of each power generation region is measured and calculated through positive correlation between the power generation power and irradiance, and difference of weather on measuring and calculating results of irradiance is eliminated according to the weather parameters, so that measuring and calculating accuracy of regional irradiance is improved.
Drawings
Fig. 1 is a schematic diagram of a hardware architecture of a measuring and calculating device according to an embodiment of the present invention;
FIG. 2 is a flow chart of a first embodiment of a method for irradiance measurement in a photovoltaic power plant of the present invention;
FIG. 3 is a flow chart of a second embodiment of a method for irradiance measurement in a photovoltaic power plant of the present invention;
FIG. 4 is a flow chart of a third embodiment of a method for irradiance measurement in a photovoltaic power plant of the present invention;
FIG. 5 is a flow chart of a fourth embodiment of a method for irradiance measurement in a photovoltaic power plant of the present invention;
FIG. 6 is a flow chart of a fifth embodiment of a method for irradiance measurement of a photovoltaic power plant of the present invention;
FIG. 7 is a flow chart of a sixth embodiment of a method for irradiance measurement in a photovoltaic power plant of the invention;
FIG. 8 is a flow chart of a seventh embodiment of a method for irradiance measurement in a photovoltaic power plant of the invention;
fig. 9 shows the correlation difference between the generated power and irradiance of the photovoltaic inverter in a certain two days of a certain large photovoltaic power plant of 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
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Because of the large area occupied by a large photovoltaic power plant, irradiance received by photovoltaic modules on different areas is inconsistent, even with large differences. As shown in fig. 9, there is a significant difference in correlation between irradiance data collected by a set of irradiance meters and the generated power of a photovoltaic power plant over different areas.
The existing large-scale photovoltaic power station is basically provided with one or more sets of irradiation monitors, so that irradiance monitored by the irradiation monitors cannot accurately represent irradiation conditions of different areas of the photovoltaic power station.
In order to solve the above-mentioned drawbacks, an embodiment of the present invention provides a method for measuring irradiance of a photovoltaic power plant, a measuring device, and a readable storage medium, wherein the method for measuring irradiance of the photovoltaic power plant mainly includes the following steps:
dividing the region of the photovoltaic power station to obtain at least two power generation regions of the photovoltaic power station;
acquiring current weather parameters of the photovoltaic power station and regional power generation power of each power generation region;
and obtaining the calculated irradiance of each power generation area according to the weather parameters and the power generation power of each area.
The method comprises the steps of carrying out regional division on a photovoltaic power station to obtain at least two power generation regions of the photovoltaic power station, obtaining current weather parameters of the photovoltaic power station and regional power generation power of each power generation region, and obtaining calculated irradiance of each power generation region according to the weather parameters and regional power generation power, namely calculating irradiance of each power generation region through positive correlation between the power generation power and the irradiance, and eliminating differences caused by weather on calculation results of irradiance according to the weather parameters, so that calculation accuracy of regional irradiance is improved.
As shown in fig. 1, fig. 1 is a schematic hardware architecture diagram of a measuring and calculating device according to an embodiment of the present invention.
As shown in fig. 1, the measuring device may include: a processor 1001, such as a CPU, a user interface 1003, a network interface 1004, a memory 1005, a 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 (Display), an input unit such as a keyboard, etc., and the optional user interface 1003 may also 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 hardware architecture of the measuring device shown in fig. 1 does not constitute a limitation of the measuring device, and may include more or fewer components than shown, or may combine certain components, or may have a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and an irradiance measuring program may be included in the memory 1005, which is a computer storage medium.
In the measuring and calculating device shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the processor 1001 may be configured to invoke the irradiance calculation program stored in the memory 1005 and perform the following operations:
dividing the region of the photovoltaic power station to obtain at least two power generation regions of the photovoltaic power station;
acquiring current weather parameters of the photovoltaic power station and regional power generation power of each power generation region;
and obtaining the calculated irradiance of each power generation area according to the weather parameters and the power generation power of each area.
Further, the processor 1001 may be configured to invoke the irradiance measurement program stored in the memory 1005, and further perform the following operations:
acquiring current weather parameters of the photovoltaic power station, wherein the weather parameters comprise at least one of aerosol optical thickness, rayleigh scattering optical thickness and water vapor content;
acquiring a preset parameter interval corresponding to the weather parameter;
acquiring regional power generation power of each power generation region in the photovoltaic power station, wherein the power generation region comprises at least one photovoltaic group string;
and obtaining the measured irradiance of each power generation area according to the preset parameter interval and the power generation power of each power generation area.
Further, the processor 1001 may be configured to invoke the irradiance measurement program stored in the memory 1005, and further perform the following operations:
inputting the weather parameters and the regional power generation power into an irradiance measuring model, wherein the irradiance measuring model measures regional irradiance of each power generation region according to the weather parameters and the regional power generation power of each power generation region;
and obtaining the regional irradiance of each power generation region measured by the irradiance measuring model.
Further, the processor 1001 may be configured to invoke the irradiance measurement program stored in the memory 1005, and further perform the following operations:
acquiring historical operation data of all photovoltaic group strings in the photovoltaic power station, wherein the historical operation data at least comprises historical power generation time and historical power generation power;
acquiring historical weather parameters and historical irradiation detection values of the photovoltaic power station at all moments;
acquiring an irradiance sub-measuring model of each power generation area according to each historical weather parameter, the historical irradiation detection value and the historical operation data;
and generating an irradiance measuring model of the photovoltaic power station according to each irradiance measuring model.
Further, the processor 1001 may be configured to invoke the irradiance measurement program stored in the memory 1005, and further perform the following operations:
processing the historical power of each photovoltaic string according to the historical string temperature of the photovoltaic string to obtain target power of the photovoltaic string;
obtaining historical region power generation power of each power generation region according to target power generation of each photovoltaic group string in each power generation region;
acquiring historical region irradiance of each power generation region at each historical power generation time according to each irradiation detection value and each historical region power generation power;
acquiring a historical parameter interval corresponding to the historical weather parameter;
and obtaining an irradiance sub-measuring model of each power generation area according to each historical area power generation power, each historical area irradiance and each parameter interval.
Further, the processor 1001 may be configured to invoke the irradiance measurement program stored in the memory 1005, and further perform the following operations:
acquiring a preset deviation range of the power generation area corresponding to each calculated irradiance;
judging whether each calculated irradiance is located in a preset deviation range corresponding to the calculated irradiance;
when the calculated irradiance exceeds a preset deviation range, acquiring a fitting value corresponding to the regional power generation power, and taking the fitting value as corrected calculated irradiance;
when the calculated irradiance is in a preset deviation range, taking the current calculated irradiance as corrected calculated irradiance.
Further, the processor 1001 may be configured to invoke the irradiance measurement program stored in the memory 1005, and further perform the following operations:
acquiring a preset number of historical region power generation powers and historical region irradiance;
generating an irradiance fitting curve of each power generation area according to the historical area power generation of each power generation area and the historical area irradiance;
and according to the fitting curve of each power generation area, a preset deviation range of each power generation area is obtained.
As shown in fig. 2, in a first embodiment of the irradiance measuring method of the photovoltaic power plant of the invention, the irradiance measuring method of the photovoltaic power plant comprises the steps of:
s010, dividing the areas of the photovoltaic power station to obtain at least two power generation areas of the photovoltaic power station;
step S020, obtaining current weather parameters of the photovoltaic power station and regional power generation power of each power generation region;
and step S030, obtaining the measured irradiance of each power generation area according to the weather parameters and the power generation power of each area.
In this embodiment, the photovoltaic power plant includes a weather sensing device, and the processor sends a detection instruction to the weather sensing device, so as to obtain current weather data of the photovoltaic power plant through the weather sensing device, calculate weather parameters according to the weather data, then obtain current power generated by each photovoltaic module in the photovoltaic power plant, and then add the power generated by the photovoltaic modules in the same power generation area according to the area information to which each photovoltaic module string belongs to obtain the area power generated by each power generation area.
The measuring and calculating device obtains the module model and the installation angle of each photovoltaic module, then the photovoltaic power station is divided into areas according to the module model and the installation angle, wherein the module models of the photovoltaic modules in the same area are the same, the installation angles are the same as much as possible (namely, the installation angles are in the same angle interval), and then the photovoltaic modules are associated with the power generation area. The above-described region division method is merely for illustration, and is not limited to the division method for dividing the region of the photovoltaic power plant.
And carrying out power correction on the regional power generation power according to the weather parameters so as to obtain the actual regional power generation power generated by regional irradiance energy, namely reducing the influence of the weather parameters on the regional power generation power. And then calculating the calculated irradiance of each power generation area according to the power generation power of each corrected area.
Optionally, after obtaining the measured irradiance of each power generation area, the total irradiance of the photovoltaic power station may be obtained according to the measured irradiance of each power generation area, or the irradiance of each power generation area may be sent to a photovoltaic power station operation and maintenance system or a power dispatching system, so as to adjust a corresponding operation and maintenance process or a dispatching process according to the area irradiance.
In the technical scheme disclosed in this embodiment, by performing region division on a photovoltaic power station, obtaining at least two power generation regions of the photovoltaic power station, obtaining current weather parameters of the photovoltaic power station and regional power generation of each power generation region, and then obtaining measured irradiance of each power generation region according to the weather parameters and the regional power generation power, namely, measuring irradiance of each power generation region according to positive correlation between the power generation power and irradiance, and eliminating differences caused by weather on measuring results of irradiance according to the weather parameters, thereby improving measuring accuracy of regional irradiance.
Optionally, as shown in fig. 3, based on the first embodiment, in a second embodiment of the irradiance measuring method of the photovoltaic power plant of the invention, the step S030 further includes:
step S031, obtaining current weather parameters of the photovoltaic power station, wherein the weather parameters comprise at least one of aerosol optical thickness, rayleigh scattering optical thickness and water vapor content;
step S032, obtaining a preset parameter interval corresponding to the weather parameter;
step S033, obtaining regional power generation power of each power generation region in the photovoltaic power station, wherein the power generation region comprises at least one photovoltaic group string;
and step S034, obtaining the measured irradiance of each power generation area according to the preset parameter interval and the power generation power of each power generation area.
In this embodiment, the processor firstly obtains the ambient temperature, ambient humidity, air pressure and wind speed detected by the meteorological sensing device of the photovoltaic power station, and then obtains the calculation parameters stored in the memory, such as the wavelength of the irradiation spectrum, altitude, solar constant, solar-to-earth distance, atmospheric optical quality, atmospheric optical thickness, absorption gas transmittance, standard air pressure, solar altitude angle, refraction-corrected solar altitude angle, geographic latitude and the like, then calculates the current weather parameters of the photovoltaic power station according to the parameters, then obtains the preset parameter interval corresponding to each weather parameter, and then determines the current weather condition of the photovoltaic power station according to each preset parameter interval, wherein different weather conditions correspond to different modification parameters.
Specifically, due to different weather conditions, namely different aerosol optical thickness, rayleigh scattering optical thickness or water vapor content, the light scattering degree is different, so that different power generation powers of the photovoltaic module can be generated under the same irradiance, and the actual irradiance cannot be measured according to the actual power generation power.
The method comprises the steps that a processor obtains modification parameters corresponding to weather conditions, then obtains current power generation power of each photovoltaic module in a photovoltaic power station, and adds the power generation power of the photovoltaic modules in the same power generation area according to area information of each photovoltaic module string to obtain area power generation power of each power generation area; correcting regional power generation according to the corresponding modification parameters of the current weather working conditions, and measuring and calculating irradiance of each power generation region according to each corrected regional power generation.
In the technical scheme disclosed by the embodiment, the type of the weather working condition is accurately distinguished by setting the preset parameter interval corresponding to the weather parameter, and then the regional power generation power is adjusted according to the weather working condition, so that the difference of weather on the irradiance measuring and calculating result is eliminated, and the accuracy of measuring and calculating the regional irradiance is improved.
Optionally, as shown in fig. 4, based on the first embodiment, in a third embodiment of the irradiance calculating method of the photovoltaic power plant of the invention, the step S030 further includes:
step S035, inputting the weather parameters and the generated power of each region into an irradiance measuring model, wherein the irradiance measuring model measures the regional irradiance of each power generation region according to the weather parameters and the generated power of each power generation region;
step S036, obtaining the regional irradiance of each power generation region calculated by the irradiance calculation model.
In this embodiment, when an irradiance measurement model exists in the measurement device, after obtaining the weather parameter and the regional power of each power generation region, the weather parameter and the regional power of each power generation region may be input into the irradiance measurement model, so that the irradiance measurement model measures the regional irradiance of each power generation region according to the weather parameter and the regional power of each power generation region, and then obtains the regional irradiance of each power generation region measured by the irradiance measurement model.
Specifically, the irradiance measuring model may correct the regional power generated in each power generation region according to weather parameters, so as to obtain the theoretical regional power generated in each power generation region under actual irradiance, then obtain the theoretical regional irradiance according to the theoretical regional power generated, and output the theoretical regional irradiance as the measured irradiance of the region.
In the technical scheme disclosed in this embodiment, the current weather parameters of the photovoltaic power plant and the regional power generation power of each power generation region are obtained, and then the measured irradiance of each power generation region is obtained according to the weather parameters, the regional power generation power and the irradiance measuring model, that is, the regional irradiance corresponding to the power generation power of each region is obtained through the irradiance measuring model, and the difference of weather on the measuring result of irradiance is eliminated according to the weather parameters, so that the measuring accuracy of regional irradiance is improved.
Optionally, as shown in fig. 5, in a fourth embodiment of the irradiance calculating method of the photovoltaic power plant according to the present invention, before the step S020, the method further includes:
step S040, acquiring historical operation data of all photovoltaic group strings in the photovoltaic power station, wherein the historical operation data at least comprises historical power generation time and historical power generation power;
step S050, acquiring historical weather parameters and historical irradiation detection values of the photovoltaic power station at all moments;
step S060, obtaining irradiance sub-measuring and calculating models of each power generation area according to each historical weather parameter, the historical irradiation detection value and the historical operation data;
and step S070, generating an irradiance measuring model of the photovoltaic power station according to each irradiance measuring model.
In this embodiment, the measurement device firstly obtains the historical operation data of all photovoltaic strings in the photovoltaic power station, specifically, the historical operation data is the operation data in a measurement time interval, then obtains the historical environment temperature, the historical environment historical humidity, the historical air pressure and the historical wind speed detected by the meteorological sensing equipment of the photovoltaic power station in the preset time interval, obtains the historical irradiance detected by the irradiation monitor in the preset time interval, obtains the calculation parameters stored in the memory, such as the wavelength of an irradiation spectrum, the altitude, the solar constant, the solar-to-earth distance, the atmospheric optical quality, the atmospheric optical thickness, the absorption gas transmittance, the standard air pressure, the solar altitude angle, the refraction corrected solar altitude angle, the geographic latitude and the like, then calculates the historical weather parameters of the photovoltaic power station at each moment according to the parameters, and then obtains the parameter interval corresponding to the historical weather parameters of each moment, so as to determine the weather working condition corresponding to each time according to each historical irradiance, and obtain the power generation power of each region at each moment according to the historical operation data, then calculates the calculation power of each region, namely, the solar power generation model is generated according to the historical irradiance, and the measurement and calculation model of each instantaneous power generation region, and the power generation model is obtained according to the historical power generation model of each region.
It will be appreciated that in this embodiment, the historical irradiance, i.e. the irradiance monitored by the irradiance monitor, is used only to classify weather conditions and measure regional irradiance, and is not representative of the irradiance of the entire photovoltaic power plant, but rather of the irradiance of different power generation regions of the photovoltaic power plant.
In the technical scheme disclosed by the embodiment, the irradiance measuring model is obtained through training of the historical weather parameters and the historical operation data, so that the irradiance measuring speed is improved.
Optionally, as shown in fig. 6, in a fifth embodiment of the irradiance measuring method of the photovoltaic power plant according to the fourth embodiment, the step S060 further includes:
step S061, processing the historical power of each photovoltaic group string according to the historical group string temperature of the photovoltaic group string to obtain target power of the photovoltaic group string;
step S062, obtaining the historical region power generation power of each power generation region according to the target power generation power of each photovoltaic group string in each power generation region;
step S063, obtaining the historical region irradiance of each power generation region at each historical power generation time according to each irradiation detection value and each historical region power generation power;
step S064, acquiring a historical parameter interval corresponding to the historical weather parameter;
and S065, obtaining an irradiance sub-measuring and calculating model of each power generation area according to each historical area power generation, each historical area irradiance and each parameter interval.
In this embodiment, the historical operating data further includes a historical string temperature.
The method comprises the steps that a processor normalizes historical string temperatures in historical operation data according to power temperature factors, namely when the string temperatures are preset string temperatures, correction values of corresponding historical power in each historical operation data are obtained, namely target power generation is disclosed, historical regional power generation of each power generation region is obtained according to the target power generation, historical regional irradiance of each power generation region in each historical power generation time is obtained according to each irradiation detection value and each historical regional power generation power, and finally irradiance measuring sub-models of each power generation region are obtained according to historical parameter intervals, historical regional power generation powers and historical regional irradiance training corresponding to each weather parameter.
In the technical scheme disclosed in the embodiment, the irradiance measuring device model is obtained through training of historical weather parameters, historical irradiance and historical operation data, so that irradiance measuring speed is improved.
Optionally, as shown in fig. 7, in a sixth embodiment of the irradiance calculating method of the photovoltaic power plant according to the first embodiment, after the step S030, the method further includes:
step 080, obtaining a preset deviation range of the power generation area corresponding to each irradiance measurement and calculation;
step 090, judging whether each measured irradiance is located in a preset deviation range corresponding to the measured irradiance;
step S0100, when the calculated irradiance exceeds a preset deviation range, acquiring a fitting value corresponding to the power generation power of the area, and taking the fitting value as the corrected calculated irradiance;
step S110, when the calculated irradiance is in a preset deviation range, taking the current calculated irradiance as corrected calculated irradiance.
In this embodiment, after obtaining the measured irradiance of each power generation area, the processor obtains a preset deviation range corresponding to each power generation area, then sequentially determines whether each measured irradiance is located in the measured deviation range corresponding to the power generation area of the measured irradiance, and obtains a fitting value corresponding to the power generation power of the area when the measured irradiance exceeds the preset deviation range, where the fitting value is a theoretical value of irradiance, that is, a theoretical value when no failure occurs in the photovoltaic string, and takes the fitting value as corrected measured irradiance, and when the measured irradiance is located in the preset deviation range, directly outputs the current measured irradiance as corrected measured irradiance.
Optionally, before the step S080, the method further includes:
step S120, obtaining a preset number of historical region power generation powers and historical region irradiance;
step S130, generating an irradiance fitting curve of each power generation area according to the historical area power generation of each power generation area and the historical area irradiance;
step S140, according to the fitted curve of each power generation region, the preset deviation range of each power generation region is set.
In this embodiment, the processor first obtains a preset number of historical region power and historical region irradiance, where the historical region irradiance is a measured value obtained by the foregoing steps. And then, according to the generated power of each historical region and the irradiance of the corresponding historical region, establishing a fitting curve of each generated region, and obtaining a preset deviation range of each generated region according to the fitting curve, wherein the upper limit of the preset deviation range is mu+3σ, the lower limit of the preset deviation range is mu-3σ, wherein mu is the average value of the fitting curve, and σ is the standard deviation of the fitting curve.
Alternatively, the error processing model may be obtained by training according to a preset number of historical region power and historical region irradiance, so as to directly input the measured irradiance into the error processing model, thereby obtaining the measured irradiance after error processing through the error processing model.
In the technical scheme disclosed by the embodiment, the accuracy of measuring and calculating the irradiance of the area is improved by setting an error processing process.
Optionally, as shown in fig. 8, in a seventh embodiment of the irradiance calculating method of the photovoltaic power plant according to the first embodiment, after the step S030, the method further includes:
and step S150, obtaining the calculated irradiance of the photovoltaic power station according to the calculated irradiance of each power generation area.
In this embodiment, the processor may obtain the measured irradiance of the entire photovoltaic power plant from the measured irradiance of each power generation region after obtaining the measured irradiance of each power generation region.
For example, an average value of the measured irradiance of each power generation area may be obtained, and the average value may be used as the measured irradiance of the photovoltaic power plant; the total value of the irradiance measured and calculated in each power generation area can be directly used as the total irradiation value of the irradiation currently received by the photovoltaic power station. The method for determining the measured irradiance of the photovoltaic power plant is not limited, that is to say, the method for determining the measured irradiance of the photovoltaic power plant can be determined from the use of the measured irradiance of the photovoltaic power plant.
According to the technical scheme disclosed by the embodiment, the calculated irradiance of the photovoltaic power station is obtained through the calculated irradiance of each power generation area, so that the accuracy of calculating the irradiance of the photovoltaic power station is improved.
In addition, an embodiment of the present invention further provides a measurement device, where the measurement device includes a memory, a processor, and an irradiance measurement program stored in the memory and capable of running on the processor, where the irradiance measurement program when executed by the processor implements the steps of the irradiance measurement method of the photovoltaic power plant according to each of the embodiments described above.
In addition, the embodiment of the present invention also proposes a readable storage medium, on which an irradiance measuring program is stored, which when executed by a processor, implements the steps of the irradiance measuring method of the photovoltaic power plant according to each of the above-described embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a measuring device (which may be a PC or the like) to perform the method according to each embodiment of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (8)
1. The irradiance measuring and calculating method for the photovoltaic power station is characterized by comprising the following steps of:
dividing the region of the photovoltaic power station to obtain at least two power generation regions of the photovoltaic power station;
acquiring historical operation data of all photovoltaic group strings in the photovoltaic power station, wherein the historical operation data at least comprises historical power generation time and historical power generation power;
acquiring historical weather parameters and historical irradiation detection values of the photovoltaic power station at all moments;
training according to each historical weather parameter, the historical irradiation detection value and the historical operation data to obtain an irradiance sub-measuring and calculating model of each power generation area;
generating an irradiance measuring model of the photovoltaic power station according to each irradiance measuring model;
acquiring current weather parameters of the photovoltaic power station and regional power generation power of each power generation region;
inputting the weather parameters and the regional power generation power into the irradiance measuring and calculating model, correcting the regional power generation power of each power generation region by the irradiance measuring and calculating model according to the weather parameters so as to obtain the theoretical regional power generation power of each power generation region under actual irradiance, obtaining theoretical regional irradiance according to the theoretical regional power generation power, and taking the theoretical regional irradiance as the measured irradiance of the region;
and obtaining the regional irradiance of each power generation region measured by the irradiance measuring model.
2. The method for measuring irradiance of a photovoltaic power plant of claim 1, wherein said step of obtaining measured irradiance of each of said power generation areas based on said weather parameter and the power generation power of each of said areas comprises:
acquiring current weather parameters of the photovoltaic power station, wherein the weather parameters comprise at least one of aerosol optical thickness, rayleigh scattering optical thickness and water vapor content;
acquiring a preset parameter interval corresponding to the weather parameter;
acquiring regional power generation power of each power generation region in the photovoltaic power station, wherein the power generation region comprises at least one photovoltaic group string;
and obtaining the measured irradiance of each power generation area according to the preset parameter interval and the power generation power of each power generation area.
3. The method of irradiance measurement of a photovoltaic power plant of claim 1, wherein said historical operating data further includes a historical string temperature, and said step of training an irradiance sub-measurement model for each of said power generation areas based on each of said historical weather parameters, said historical irradiance detection values, and said historical operating data comprises:
processing the historical power of each photovoltaic string according to the historical string temperature of the photovoltaic string to obtain target power of the photovoltaic string;
obtaining historical region power generation power of each power generation region according to target power generation of each photovoltaic group string in each power generation region;
acquiring historical region irradiance of each power generation region at each historical power generation time according to each irradiation detection value and each historical region power generation power;
acquiring a historical parameter interval corresponding to the historical weather parameter;
and training according to the historical parameter interval, the historical region power generation and the historical region irradiance corresponding to each weather parameter to obtain an irradiance measuring instrument model of each power generation region.
4. The method for measuring irradiance of a photovoltaic power plant of claim 1, wherein after said step of obtaining measured irradiance for each of said power generation areas based on said weather parameter and the power generation power for each of said areas, further comprises:
acquiring a preset deviation range of the power generation area corresponding to each calculated irradiance;
judging whether each calculated irradiance is located in a preset deviation range corresponding to the calculated irradiance;
when the calculated irradiance exceeds a preset deviation range, acquiring a fitting value corresponding to the regional power generation power, and taking the fitting value as corrected calculated irradiance;
when the calculated irradiance is in a preset deviation range, taking the current calculated irradiance as corrected calculated irradiance.
5. The method for measuring irradiance of a photovoltaic power plant of claim 4, wherein prior to the step of obtaining a predetermined deviation range of the power generation area corresponding to the measured irradiance, further comprising:
acquiring a preset number of historical region power generation powers and historical region irradiance;
generating an irradiance fitting curve of each power generation area according to the historical area power generation of each power generation area and the historical area irradiance;
and obtaining a preset deviation range of each power generation region according to the fitted curve of each power generation region, wherein the upper limit of the preset deviation range is mu+3σ, the lower limit of the preset deviation range is mu-3σ, mu is the average value of the fitted curve, and sigma is the standard deviation of the fitted curve.
6. The method for measuring irradiance of a photovoltaic power plant of claim 1, wherein after said step of obtaining measured irradiance for each of said power generation areas based on said weather parameter and the power generation power for each of said areas, further comprises:
and obtaining the calculated irradiance of the photovoltaic power station according to the calculated irradiance of each power generation area.
7. A measuring device, comprising: a memory, a processor, and an irradiance measuring program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the irradiance measuring method of the photovoltaic power plant of any one of claims 1 to 6.
8. A readable storage medium, characterized in that the readable storage medium has stored thereon an irradiance measuring program, which when executed by a processor, implements the steps of the irradiance measuring method of the photovoltaic power plant of any of claims 1 to 6.
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