A distributed photovoltaic available power generation power evaluation method, system, electronic equipment and readable storage medium

Abstract

The present application belongs to the technical field of new energy power system, and particularly relates to a distributed photovoltaic available power generation power evaluation method, system, electronic device and readable storage medium, the method comprising: determining a sample inverter of an evaluation area; collecting distributed photovoltaic power generation data, meteorological data and related data of the sample inverter of the evaluation area; based on the state of the sample inverter, using the related data of the sample inverter to determine the available power generation power of the distributed photovoltaic, or using the distributed photovoltaic power generation data and the meteorological data to determine the available power generation power of the distributed photovoltaic. The present application not only realizes the acquisition of high-precision available power generation power without adding new monitoring equipment, but also adapts to the characteristics of scattered distributed photovoltaic data and poor monitoring conditions, improves the reliability and accuracy of the available power generation power, and further makes the available power generation power evaluation result directly support power grid dispatching, dispatching decision optimization, operation and maintenance optimization and regional power source scientific planning.

Description

Technical Field

[0001] This invention belongs to the field of new energy power system technology, specifically relating to a method, system, electronic device and readable storage medium for assessing the available power generation capacity of distributed photovoltaic power generation. Background Technology

[0002] The current scale of distributed photovoltaic (PV) installations is growing rapidly. Although there are similar methods for assessing available PV power generation in the industry (such as enterprise standard Q / GDW11761), these methods are applicable to centralized PV power plants connected to the grid at voltage levels above 10kV. They are difficult to adapt to large-scale PV power generation system clusters connected at 380V / 220V voltage levels. Furthermore, the characteristics of distributed PV, such as "scattered distribution, small single-station capacity, and poor monitoring conditions," result in problems such as data gaps, difficulty in adaptation, low accuracy, and poor operability in assessing available power generation. These issues fail to meet the business needs of precise grid regulation, optimized dispatching decisions, and scientific planning of regional power sources. Summary of the Invention

[0003] To overcome the problems existing in the above-mentioned related technologies, the present invention provides a method, system, electronic device and readable storage medium for assessing the available power generation of distributed photovoltaic systems.

[0004] According to a first aspect of the present invention, a method for assessing the available power generation of distributed photovoltaic systems is provided, comprising: Identify the sample inverter for the area to be evaluated; Collect distributed photovoltaic power generation data, meteorological data, and relevant data from the model inverter in the area to be evaluated; Based on the status of the sample inverter, the available power generation capacity of distributed photovoltaic power can be determined using the relevant data of the sample inverter, or the available power generation capacity of distributed photovoltaic power can be determined using the distributed photovoltaic power generation data and the meteorological data.

[0005] Preferably, the sample inverter for determining the region to be evaluated includes: Inverter units or distributed photovoltaic power stations that are not subject to control within the area to be evaluated are selected as model inverters.

[0006] Preferably, the distributed photovoltaic power generation data includes: ledger data of the distributed photovoltaic power generation and operation data of the distributed photovoltaic power generation; The ledger data for distributed photovoltaic power generation shall include at least the following two types: grid-connected installed capacity and project location latitude and longitude. The operational data of the distributed photovoltaic power generation shall include at least the following two types: active power of distributed photovoltaic power generation and daily power generation. The meteorological data includes at least the following four types: total irradiance, direct irradiance, diffuse irradiance, and temperature.

[0007] Preferably, the relevant data of the prototype inverter includes: the basic data of the prototype inverter and the operating data of the prototype inverter; The basic data of the prototype inverter includes at least the following five types: the name of the photovoltaic power station where the prototype inverter is located, the latitude and longitude of the photovoltaic power station where the prototype inverter is located, the rated capacity of the prototype inverter, the number of prototype inverters, and the equipment parameters of the photovoltaic modules under standard operating conditions; The operating data of the prototype inverter includes at least the following three types: active power, daily power generation, and operating status.

[0008] Preferably, determining the available distributed photovoltaic power generation capacity based on the state of the sample inverter using relevant data from the sample inverter, or determining the available distributed photovoltaic power generation capacity using the distributed photovoltaic power generation data and the meteorological data, includes: When the prototype inverter is operating normally, the theoretical power generation of distributed photovoltaic power is calculated using the relevant data of the prototype inverter; when the prototype inverter is operating abnormally, the theoretical power generation of distributed photovoltaic power is calculated using the distributed photovoltaic power generation data and the meteorological data. The available power generation of distributed photovoltaics is calculated using the theoretical power generation of the distributed photovoltaic system.

[0009] Preferably, when the prototype inverter is operating in an abnormal state, calculating the theoretical power generation of the distributed photovoltaic system using the distributed photovoltaic power generation data and the meteorological data includes: The solar altitude angle and solar azimuth angle at the location of the distributed photovoltaic system are used to calculate the solar incidence angle at the location of the distributed photovoltaic system. The effective irradiance of the inclined surface of the photovoltaic module is calculated using the solar incident angle. The surface temperature of the photovoltaic module is calculated using the effective irradiance of the inclined surface of the photovoltaic module. The surface temperature difference of the photovoltaic module is calculated using the surface temperature of the photovoltaic module. Using the temperature difference on the surface of the photovoltaic module, the optimal output current and optimal output voltage of the photovoltaic module under the current meteorological conditions are calculated respectively. The DC output power of the photovoltaic module is calculated using the optimal output current and the optimal output voltage of the photovoltaic module. The theoretical power generation of the distributed photovoltaic system is calculated using the DC output power of the photovoltaic module.

[0010] Preferably, the distributed photovoltaic power station is a 10kV distributed photovoltaic power station.

[0011] Preferably, when the prototype inverter is in normal operating condition, the formula for calculating the theoretical power generation of the distributed photovoltaic system includes:

[0012] In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. Y The number of distributed photovoltaic (PV) model inverters in the region. N y Within the region, the first y The rated capacity of the distributed photovoltaic system is represented by a single model inverter. M y For the first y The rated capacity of a sample inverter p y Let y be the actual power generation of the y-th sample inverter.

[0013] Preferably, the formula for calculating the solar altitude angle includes:

[0014] The formula for calculating the solar azimuth angle includes:

[0015] The formula for calculating the hour angle at the location of distributed photovoltaic power generation includes:

[0016] In the above formula, For the hour angle, To predict the number of hours from local mean solar noon, The solar altitude angle, Geographical latitude, The declination angle, This is the solar azimuth angle.

[0017] Preferably, the formula for calculating the solar incidence angle includes:

[0018] In the above formula, The angle of incidence of the sun. The solar altitude angle, The azimuth of the sun. For the azimuth angle of the photovoltaic module, The tilt angle of the photovoltaic module.

[0019] Preferably, the formula for calculating the effective irradiance of the inclined surface of the photovoltaic module includes:

[0020] In the above formula, The effective irradiance of the inclined surface of the photovoltaic module. Direct radiation intensity measured by meteorological monitoring equipment; The angle of incidence of the sun. The intensity of diffused radiation measured by meteorological monitoring equipment. For the tilt angle of photovoltaic modules, Ground reflectance coefficient, Total irradiance measured by meteorological monitoring equipment.

[0021] Preferably, the formula for calculating the surface temperature of the photovoltaic module includes:

[0022] The formula for calculating the surface temperature difference of the photovoltaic module includes:

[0023] In the above formula, The surface temperature of the photovoltaic module. For ambient temperature, This is the temperature correction factor. The effective irradiance of the inclined surface of the photovoltaic module. For the temperature difference of the photovoltaic module surface, This refers to the standard component temperature.

[0024] Preferably, the formula for calculating the optimal output current of the photovoltaic module under the current meteorological conditions includes:

[0025] The formula for calculating the optimal output voltage of the photovoltaic module under the current meteorological conditions includes:

[0026] The formula for calculating the difference between the actual irradiance and the standard irradiance includes:

[0027] In the above formula, The optimal output current for the component under current weather conditions. This represents the optimal output current of the photovoltaic module under standard operating conditions. The effective irradiance of the inclined surface of the photovoltaic module. Standard solar irradiance, , b and c For compensation coefficient, This represents the difference between the actual component temperature and the standard component temperature. The optimal output voltage for the component under current weather conditions. Let be the optimal output voltage of the photovoltaic module under standard operating conditions, and e be the base of the natural logarithm. This is the difference between the actual irradiance and the standard irradiance.

[0028] Preferably, the formula for calculating the DC output power of the photovoltaic module includes:

[0029] In the above formula, This refers to the DC output power of the photovoltaic module. The optimal output voltage for the component under current weather conditions; This is the optimal output current for the component under the current weather conditions.

[0030] Preferably, the formula for calculating the theoretical power generation of the distributed photovoltaic system includes:

[0031] In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. K 1 represents the conversion coefficient from the DC side of the photovoltaic module to the output power of the inverter. P dc For the DC output power of photovoltaic modules, s ar This represents the total rated capacity of distributed photovoltaic power within the region. s st This is the rated capacity of the meteorological data extrapolation model.

[0032] Preferably, the formula for calculating the available power generation of the distributed photovoltaic system includes:

[0033] In the above formula, P av The available power generation capacity of distributed photovoltaic systems. K av The available power generation mapping coefficient, P th This represents the theoretical power generation of distributed photovoltaic systems.

[0034] According to a second aspect of the present invention, a distributed photovoltaic available power generation assessment system is provided, comprising: The first determining unit is used to determine the sample inverter for the area to be evaluated; The data acquisition unit is used to collect distributed photovoltaic power generation data, meteorological data, and relevant data of the sample inverter in the area to be evaluated. The second determining unit is used to determine the available power generation capacity of distributed photovoltaic power generation based on the state of the sample inverter and using relevant data from the sample inverter, or to determine the available power generation capacity of distributed photovoltaic power generation using the distributed photovoltaic power generation data and the meteorological data.

[0035] Preferably, the first determining unit is specifically used for: Inverter units or distributed photovoltaic power stations that are not subject to control within the area to be evaluated are selected as model inverters.

[0036] Preferably, the distributed photovoltaic power generation data includes: ledger data of the distributed photovoltaic power generation and operation data of the distributed photovoltaic power generation; The ledger data for distributed photovoltaic power generation shall include at least the following two types: grid-connected installed capacity and project location latitude and longitude. The operational data of the distributed photovoltaic power generation shall include at least the following two types: active power of distributed photovoltaic power generation and daily power generation. The meteorological data includes at least the following four types: total irradiance, direct irradiance, diffuse irradiance, and temperature.

[0037] Preferably, the relevant data of the prototype inverter includes: the basic data of the prototype inverter and the operating data of the prototype inverter; The basic data of the prototype inverter includes at least the following five types: the name of the photovoltaic power station where the prototype inverter is located, the latitude and longitude of the photovoltaic power station where the prototype inverter is located, the rated capacity of the prototype inverter, the number of prototype inverters, and the equipment parameters of the photovoltaic modules under standard operating conditions; The operating data of the prototype inverter includes at least the following three types: active power, daily power generation, and operating status.

[0038] Preferably, the second determining unit includes: The first calculation module is used to calculate the theoretical power generation of distributed photovoltaic power using relevant data of the sample inverter when the sample inverter is operating normally; and to calculate the theoretical power generation of distributed photovoltaic power using distributed photovoltaic power generation data and meteorological data when the sample inverter is operating abnormally. The second calculation module is used to calculate the available power generation of the distributed photovoltaic system using the theoretical power generation of the distributed photovoltaic system.

[0039] Preferably, when the prototype inverter is operating in an abnormal state, the first calculation module includes: The first calculation submodule is used to calculate the solar incidence angle at the location of the distributed photovoltaic system using the solar altitude angle and solar azimuth angle at the location of the distributed photovoltaic system. The second calculation submodule is used to calculate the effective irradiance of the inclined surface of the photovoltaic module using the solar incidence angle. The third calculation submodule is used to calculate the surface temperature of the photovoltaic module using the effective irradiance of the inclined surface of the photovoltaic module. The fourth calculation submodule is used to calculate the surface temperature difference of the photovoltaic module using the surface temperature of the photovoltaic module. The fifth calculation submodule is used to calculate the optimal output current and optimal output voltage of the photovoltaic module under the current meteorological conditions by utilizing the temperature difference on the surface of the photovoltaic module. The sixth calculation submodule is used to calculate the DC output power of the photovoltaic module using the optimal output current and the optimal output voltage of the photovoltaic module. The seventh calculation submodule is used to calculate the theoretical power generation of the distributed photovoltaic system using the DC output power of the photovoltaic module.

[0040] Preferably, the second calculation module includes: The eighth calculation submodule is used to calculate the available power generation of distributed photovoltaics using the theoretical power generation of the distributed photovoltaic system.

[0041] Preferably, the distributed photovoltaic power station is a 10kV distributed photovoltaic power station.

[0042] According to a third aspect of the present invention, an electronic device is provided, comprising: at least one processor and a memory; the memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the method for assessing the available power generation of distributed photovoltaic systems is implemented.

[0043] According to a fourth aspect of the present invention, a readable storage medium is provided having an executable program stored thereon, wherein when the executable program is executed, the method for assessing the available power generation of distributed photovoltaic systems is implemented.

[0044] The technical solution provided by this invention has the following beneficial effects: This invention provides a method, system, electronic device, and readable storage medium for assessing the available power generation of distributed photovoltaic (PV) power. First, a sample inverter in the area to be assessed is identified. Multi-source data, including distributed PV power generation data, meteorological data, and relevant data from the sample inverter, are collected. Then, based on the status of the sample inverter, the available power generation of distributed PV is determined using the relevant data from the multi-source data; or, the available power generation of distributed PV is determined using both the distributed PV power generation data and the meteorological data. These two different methods address unforeseen circumstances in distributed PV power generation, enabling high-precision acquisition of available power generation without the need for additional monitoring equipment. Furthermore, this method is adapted to the fragmented nature of distributed PV data and poor monitoring conditions, improving the reliability and accuracy of available power generation. The assessment results can further support precise grid regulation, optimized dispatching decisions, and scientific regional power planning. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a flowchart of a method for assessing the available power generation of distributed photovoltaic systems, provided in an embodiment of the present invention. Figure 2 This is a flowchart of a method for assessing the available power generation of distributed photovoltaic systems, provided in an embodiment of the present invention. Figure 3 This is a structural block diagram of a distributed photovoltaic available power generation assessment device provided in an embodiment of the present invention; Figure 4 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the following embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0048] Example 1 This invention provides a method for assessing the available power generation of distributed photovoltaic systems, such as... Figure 1 As shown, it includes the following steps: Step 1: Identify the sample inverter for the area to be evaluated; Step 2: Collect distributed photovoltaic power generation data, meteorological data, and relevant data from the sample inverter in the area to be evaluated; Step 3: Based on the status of the sample inverter, determine the available power generation capacity of distributed photovoltaic power generation using the relevant data of the sample inverter, or determine the available power generation capacity of distributed photovoltaic power generation using distributed photovoltaic power generation data and meteorological data.

[0049] Further, step 1 includes: Step 11: Select an inverter unit or distributed photovoltaic power station that is not under control within the area to be evaluated as a sample inverter.

[0050] In some embodiments, the distributed photovoltaic power station may be, but is not limited to, a 10kV distributed photovoltaic power station.

[0051] Furthermore, distributed photovoltaic (PV) power generation data includes: ledger data for distributed PV power generation and operational data for distributed PV power generation; The ledger data for distributed photovoltaic power generation should include at least the following two types: grid-connected installed capacity and project location latitude and longitude. The operational data for distributed photovoltaic (PV) power generation should include at least the following two types: active power of distributed PV and daily power generation. Meteorological data should include at least the following four types: total irradiance, direct irradiance, diffuse irradiance, and temperature.

[0052] Furthermore, relevant data for the prototype inverter includes: basic data and operating data of the prototype inverter; The basic data of the prototype inverter should include at least the following five types: the name of the photovoltaic power station where the prototype inverter is located, the latitude and longitude of the photovoltaic power station where the prototype inverter is located, the rated capacity of the prototype inverter, the number of prototype inverters, and the equipment parameters of the photovoltaic modules under standard operating conditions. The operating data of the prototype inverter should include at least the following three types: active power, daily power generation, and operating status.

[0053] Further, step 3 includes: Step 31: When the prototype inverter is operating normally, calculate the theoretical power generation of distributed photovoltaic power using the relevant data of the prototype inverter; when the prototype inverter is operating abnormally, calculate the theoretical power generation of distributed photovoltaic power using distributed photovoltaic power generation data and meteorological data. Step 32: Calculate the available power generation of distributed photovoltaic (PV) using the theoretical power generation of distributed PV. Further, when the prototype inverter is operating in normal condition, the formula for calculating the theoretical power generation of distributed PV includes:

[0054] In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. Y The number of distributed photovoltaic (PV) model inverters in the region. N y Within the region, the first y The rated capacity of the distributed photovoltaic system is represented by a single model inverter. M y For the first y The rated capacity of a sample inverter p y Let y be the actual power generation of the y-th sample inverter.

[0055] Furthermore, when the prototype inverter is operating in an abnormal state, step 31 includes: Step 311: Calculate the solar incidence angle at the location of the distributed photovoltaic system using the solar altitude angle and solar azimuth angle at the location of the distributed photovoltaic system. Specifically, the formula for calculating the solar altitude angle includes:

[0056] The formula for calculating the solar azimuth angle includes:

[0057] The formula for calculating the hour angle at the location of distributed photovoltaic power generation includes:

[0058] In the above formula, For the hour angle, To predict the number of hours from local mean solar noon, The solar altitude angle, Geographical latitude, The declination angle, This is the solar azimuth angle; Specifically, the formula for calculating the angle of solar incidence includes:

[0059] In the above formula, The angle of incidence of the sun. The solar altitude angle, The azimuth of the sun. For the azimuth angle of the photovoltaic module, The tilt angle of the photovoltaic module; Step 312: Calculate the effective irradiance of the inclined surface of the photovoltaic module using the solar incidence angle; Specifically, the formula for calculating the effective irradiance of the inclined surface of a photovoltaic module includes:

[0060] In the above formula, The effective irradiance of the inclined surface of the photovoltaic module. Direct radiation intensity measured by meteorological monitoring equipment; The angle of incidence of the sun. The intensity of diffused radiation measured by meteorological monitoring equipment. For the tilt angle of photovoltaic modules, Ground reflectance coefficient, Total irradiance measured by meteorological monitoring equipment; Step 313: Calculate the surface temperature of the photovoltaic module using the effective irradiance of the inclined surface of the photovoltaic module; Step 314: Calculate the surface temperature difference of the photovoltaic module using the surface temperature of the photovoltaic module; Specifically, the formula for calculating the surface temperature of a photovoltaic module includes:

[0061] The formula for calculating the surface temperature difference of a photovoltaic module includes:

[0062] In the above formula, The surface temperature of the photovoltaic module. For ambient temperature, This is the temperature correction factor. The effective irradiance of the inclined surface of the photovoltaic module. For the temperature difference of the photovoltaic module surface, Standard component temperature; Step 315: Calculate the optimal output current and optimal output voltage of the photovoltaic module under the current weather conditions using the temperature difference on the photovoltaic module surface. Specifically, the formula for calculating the optimal output current of photovoltaic modules under current meteorological conditions includes:

[0063] The formula for calculating the optimal output voltage of photovoltaic modules under current meteorological conditions includes:

[0064] The formula for calculating the difference between the actual irradiance and the standard irradiance includes:

[0065] In the above formula, The optimal output current for the component under current weather conditions. This represents the optimal output current of the photovoltaic module under standard operating conditions. The effective irradiance of the inclined surface of the photovoltaic module. Standard solar irradiance, , b and c For compensation coefficient, This represents the difference between the actual component temperature and the standard component temperature. The optimal output voltage for the component under current weather conditions. Let be the optimal output voltage of the photovoltaic module under standard operating conditions, and e be the base of the natural logarithm. This is the difference between the actual irradiance and the standard irradiance. Step 316: Calculate the DC output power of the photovoltaic module using the optimal output current and optimal output voltage of the photovoltaic module; Specifically, the formula for calculating the DC output power of photovoltaic modules includes:

[0066] In the above formula, This refers to the DC output power of the photovoltaic module. The optimal output voltage for the component under current weather conditions; The optimal output current for the component under current weather conditions; Step 317: Calculate the theoretical power generation of distributed photovoltaic systems using the DC output power of the photovoltaic modules; Specifically, the formula for calculating the theoretical power generation of distributed photovoltaic systems includes:

[0067] In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. K 1 represents the conversion coefficient from the DC side of the photovoltaic module to the output power of the inverter. P dc For the DC output power of photovoltaic modules, s ar This represents the total rated capacity of distributed photovoltaic power within the region. s st This is the rated capacity of the meteorological data extrapolation model.

[0068] Further, step 32 includes: Step 321: Calculate the available power generation of distributed photovoltaic power using the theoretical power generation of distributed photovoltaic power; Specifically, the formula for calculating the available power generation of distributed photovoltaic systems includes:

[0069] In the above formula, P av The available power generation capacity of distributed photovoltaic systems. K av The available power generation mapping coefficient, P th This represents the theoretical power generation of distributed photovoltaic systems. Furthermore, the method also includes: Step 41: Regularly conduct a reliability test on the available power generation of distributed photovoltaic (PV) power during non-curtailment periods. If the test result is qualified, the available power generation of distributed PV power is reliable; if the test result is unqualified, the available power generation of distributed PV power is unreliable. Replace the sample inverter or calibrate the meteorological extrapolation parameters, and retest the reliability of the available power generation of distributed PV power until the test result is qualified. Among them, the duration of non-power-restricted periods is greater than or equal to the preset duration.

[0070] Furthermore, step 41 involves periodically conducting reliability tests on the available distributed photovoltaic power generation during non-curtailment periods, including: Step 411: Identify the sample inverter for the area to be evaluated; Step 412: Collect distributed photovoltaic power generation data, meteorological data, and relevant data of the sample inverter for the area to be evaluated during non-power curtailment periods; Step 413: Based on the state of the sample inverter, determine the theoretical power generation of distributed photovoltaic power using the relevant data of the sample inverter, or determine the theoretical power generation of distributed photovoltaic power using distributed photovoltaic power generation data and meteorological data; Step 414: Calculate the available power generation of distributed photovoltaic power using the theoretical power generation of distributed photovoltaic power; Step 415: Calculate the relative error using the available power generation of distributed photovoltaic power and the actual power generation of distributed photovoltaic power; Step 416: If the relative error is less than or equal to the error threshold, the test result is qualified; otherwise, the test result is unqualified.

[0071] It should be noted that the implementation process of step 411 of the present invention is the same as that of step 1 of the present invention.

[0072] Further, step 413 includes: Step 4131: When the prototype inverter is in normal operation, calculate the theoretical power generation of distributed photovoltaic power using the relevant data of the prototype inverter; Step 4132: When the prototype inverter is in an abnormal operating state, the theoretical power generation of the distributed photovoltaic system is calculated using distributed photovoltaic power generation data and meteorological data.

[0073] It should be noted that the implementation process of steps 4131 and 4132 of the present invention is the same as the implementation process of step 31 of the present invention.

[0074] It should be noted that the implementation process of step 4141 of the present invention is the same as the implementation process of step 32 of the present invention, and the implementation process of step 4142 is the same as the implementation process of step 33 of the present invention.

[0075] Furthermore, meteorological extrapolation parameters include: temperature correction coefficient, compensation coefficient, and conversion coefficient from the DC side of the photovoltaic module to the inverter output power.

[0076] Furthermore, the formula for calculating the relative error includes:

[0077] In the above formula, This is a relative error. E AV This refers to the available power generation from distributed photovoltaic systems. E RE This represents the actual power generation of distributed photovoltaic systems.

[0078] The formula for calculating the available power generation of distributed photovoltaic power is as follows:

[0079] In the above formula, This refers to the available power generation from distributed photovoltaic systems. for t Available power generation of distributed photovoltaic systems at any given time. The time interval for calculating the available power generation of distributed photovoltaic systems; , T This is the total time point; Formula for calculating the actual power generation of distributed photovoltaic power:

[0080] In the above formula, , N This represents the total number of distributed photovoltaic clusters. , T This is the total time point; This represents the actual power generation of distributed photovoltaic systems. for t Distributed photovoltaic power at all times n Actual power generation This represents the time interval for collecting the actual power generation of distributed photovoltaic systems.

[0081] This invention ensures the reliability of the available power generation of distributed photovoltaic systems by periodically conducting reliability tests on the available power generation of distributed photovoltaic systems during non-curtailment periods.

[0082] Example 2 To further illustrate the above-described method for assessing the available power generation of distributed photovoltaic systems, this invention provides a specific example, such as... Figure 2 As shown, it includes the following steps: (1) Determine the area to be evaluated. Generally, the district (county) is the smallest area. If the calculation conditions are not available, the prefecture-level administrative region is used as the smallest area to evaluate the available distributed photovoltaic power generation in the area.

[0083] (2) Preparation of ledger data and operation data for distributed photovoltaic power generation. The ledger data should include grid-connected installed capacity, project location latitude and longitude, etc.; the operation data should include distributed photovoltaic grid-connected active power, daily grid-connected electricity, commissioning / deregistration status, and restricted records, etc.

[0084] (3) Select an inverter unit or 10kV distributed photovoltaic power station within the evaluation area that is not subject to control as a model inverter, and collect the basic data and operating data of the model inverter. The basic data of the model inverter should include the name of the photovoltaic power station, the latitude and longitude of the power station location, the inverter model, rated capacity, comprehensive power generation efficiency, photovoltaic module model and quantity, and equipment parameters of the photovoltaic modules under standard operating conditions. The operating data of the model inverter should include the inverter's active power, daily power generation, operating status (e.g., commissioning / deregistration status), and restricted records.

[0085] (4) Collect meteorological data representing the area to be assessed. Meteorological measurement elements should include: total irradiance, direct irradiance, diffuse irradiance, surface wind speed, surface wind direction, temperature and air pressure, etc.

[0086] (5) For theoretical power dual-model switching, the prototype inverter method should be used first. In principle, the number of prototype inverters should not be less than one or the capacity should account for 5%-10% of the rated capacity of distributed photovoltaic power in the assessment area. When the prototype inverter fails, a backup inverter should be used to replace the failed prototype inverter.

[0087] (6) Based on the selected sample inverter, calculate the theoretical power generation of distributed photovoltaic power according to formula (1): (1) In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. Y The number of distributed photovoltaic (PV) model inverters in the region. N y Within the region, the first y The rated capacity of the distributed photovoltaic system is represented by a single model inverter. M y For the first y The rated capacity of a sample inverterp y Let y be the actual power generation of the y-th sample inverter.

[0088] (7) When there are no qualified model inverters, or when the output of the model inverters must be limited or they cannot generate electricity normally, resulting in the number of model inverters not meeting the minimum requirements, switch to the meteorological data extrapolation method to calculate the theoretical power.

[0089] (8) Calculate the hour angle, solar altitude angle and solar azimuth angle of the location of the distributed photovoltaic system. The hour angle is calculated using Equation (2), the solar altitude angle is calculated using Equation (3), and the solar azimuth angle is calculated using Equation (4).

[0090] (2) (3) (4) In the above formula, The hour angle is expressed in degrees (°). The time is the number of hours away from local mean solar noon (12:00). The hour angle is negative in the morning and positive in the afternoon. The solar altitude angle is expressed in degrees (°). The latitude is expressed in degrees (°). Declination angle, in degrees (°); The solar azimuth is expressed in degrees (°).

[0091] (9) Calculate the solar incidence angle, the formula is shown in equation (5).

[0092] (5) In the above formula, The angle of incidence of the sun. The solar altitude angle is expressed in degrees (°). The solar azimuth angle is expressed in degrees (°). The azimuth angle of the photovoltaic module is in degrees (°). The tilt angle of the photovoltaic module is expressed in degrees (°).

[0093] (10) Based on the measured horizontal irradiance and ambient temperature, the horizontal irradiance is converted into the effective irradiance of the inclined surface of the photovoltaic module using formula (6), as follows.

[0094] (6) In the above formula, The effective irradiance of the inclined surface of the photovoltaic module. Direct radiation intensity measured by meteorological monitoring equipment; The angle of incidence of the sun. The intensity of diffused radiation measured by meteorological monitoring equipment. For the tilt angle of photovoltaic modules, Ground reflectance coefficient, Total irradiance measured by meteorological monitoring equipment.

[0095] (11) Use formula (7) to convert the ambient temperature into the surface temperature of the photovoltaic module.

[0096] (7) In the above formula, This refers to the surface temperature of the photovoltaic module. The ambient temperature; The temperature correction factor is calculated annually using autoregressive methods based on collected actual operating data. The value is corrected; This represents the effective irradiance of the inclined surface of the photovoltaic module.

[0097] (12) Based on the equipment parameters of the photovoltaic module under standard operating conditions, calculate the optimal output current of the module under the current meteorological conditions using formulas (8) and (9). and optimal output voltage : (8) (9) In the above formula, The optimal output current for the component under current weather conditions. This represents the optimal output current of the photovoltaic module under standard operating conditions. The effective irradiance of the inclined surface of the photovoltaic module; Standard solar irradiance, valued at 1000 W / m². 2 a, b, and c are compensation coefficients, which are obtained by fitting the component experimental data and are periodically corrected based on the measured data. This represents the difference between the actual component temperature and the standard component temperature. , The surface temperature of the photovoltaic module. This is the standard component temperature, valued at 25ºC. The optimal output voltage for the component under current weather conditions. denoted as the optimal output voltage of the photovoltaic module under standard operating conditions, and e is the base of the natural logarithm, which can be taken as 2.71828. This is the difference between the actual irradiance and the standard irradiance. .

[0098] (13) Calculate the DC output power of the photovoltaic module using formula (10). : (10) In the above formula, This refers to the DC output power of the photovoltaic module. The optimal output voltage for the component under current weather conditions; This is the optimal output current for the component under the current weather conditions.

[0099] (14) DC output power of photovoltaic modules P dc Based on this, the theoretical power generation of distributed photovoltaic power is calculated according to formula (11).

[0100] (11) In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. K 1 is the conversion coefficient from the DC side of the photovoltaic module to the output power of the inverter. It is dimensionless and can be provided by the equipment manufacturer or taken as an empirical value in the range of 94.5%-98%. P dc This refers to the DC output power of the photovoltaic module. s ar This represents the total rated capacity of distributed photovoltaic power within the region. s st This is the rated capacity of the meteorological data extrapolation model.

[0101] (15) Based on the theoretical power generation of distributed photovoltaic, calculate the available power generation of distributed photovoltaic according to formula (12).

[0102] (12) In the above formula, P av Available power generation capacity of distributed photovoltaic power; K av This is a dimensionless mapping coefficient for available power generation. The mapping coefficient can be obtained through comprehensive analysis of historical operating data from distributed photovoltaic power stations or centralized photovoltaic power stations in nearby areas. It should be combined with historical data on the actual power generation of distributed photovoltaic power during unrestricted periods and verified annually to ensure that the coefficient accurately reflects the correlation between annual available power generation and theoretical power generation.

[0103] (16) Available power generation mapping coefficient K av It is advisable to combine historical data on the actual power generation of distributed photovoltaic power during unrestricted periods and verify it on an annual basis.

[0104] (17) The rationality of the calculation of available power generation of distributed photovoltaic power shall be tested regularly. During the period of no power curtailment (no less than 6 hours), the relative error between the available power generation and the actual power generation during the period of no power curtailment shall not exceed 5% in principle. If the deviation is large, the selection of the sample inverter shall be adjusted in time, or the parameters and strategies of the meteorological data extrapolation method shall be adjusted. The relative error shall be calculated according to formula (13): (13) In the above formula, This is a relative error. The amount of electricity available during the test period. This represents the actual power generation during the test period.

[0105] (18) The available power generation of distributed photovoltaic power is obtained by accumulating the available power generation during the statistical period, and is calculated according to formula (14): (14) In the above formula, , T Total time; Available power generation from distributed photovoltaic systems (unit: kWh); for t Available distributed photovoltaic power generation at any given time (unit: kW); The time interval for calculating the available power generation of distributed photovoltaic systems.

[0106] (19) The actual power generation of distributed photovoltaics is obtained by accumulating the actual power generation of all distributed photovoltaics in the region, and is calculated according to formula (15): (15) In the above formula, , N This refers to the number of distributed photovoltaic (PV) systems. , T Total time; This represents the actual power generation of distributed photovoltaic systems. for t Distributed photovoltaic power at all times n The actual power generation capacity; This represents the time interval for collecting the actual power generation of distributed photovoltaic systems.

[0107] To further illustrate the above-mentioned method for assessing the available power generation of distributed photovoltaic (PV) power, this invention provides a practical application case—the assessment of available PV power generation in a city in East China, including the following steps: Step A: Determine the area to be evaluated, taking distributed photovoltaic power in a city in East China as the object of evaluation for available power generation; Step B: Prepare the ledger data and operational data for the distributed photovoltaic system in the area to be evaluated. The ledger includes the installed capacity of the distributed system in the area (3570MW in this example), the latitude and longitude of the center point of the area (119.65°, 31.6° in this example), and the total output data on the evaluation date.

[0108] Step C: Select a 10kV distributed photovoltaic power station in the evaluation area that is not subject to control as a model inverter, and collect the basic data and corresponding operating data of the model inverter. In this example, the operating capacity of the model inverter is 26MW.

[0109] Step D: Collect meteorological data representing the area to be evaluated for the corresponding date. Meteorological measurement elements include: temperature, direct radiation intensity, diffuse radiation intensity, and total radiation intensity.

[0110] Step E: Theoretical power dual-model switching. In principle, the capacity of the sample inverter should account for 5%-10% of the rated capacity of distributed photovoltaic power in the evaluation area, which is not met in this example.

[0111] Step F: Since the sample inverter in this example does not meet the minimum requirement of rated capacity ratio, we switch to the meteorological data extrapolation method to calculate the theoretical power.

[0112] Step G: Based on the calculation formulas (2) to (5) for the solar incidence angle, substitute the date of this case, March 11, 2025, and the latitude, 31.6°, to obtain 24 solar incidence angles.

[0113] Step H: Based on the calculation formula (6) for effective irradiance, substitute the measured direct irradiance, diffuse irradiance, and total irradiance prepared in step D, the solar incidence angle calculated in step G, the photovoltaic module tilt angle, and the ground reflection coefficient to obtain the effective irradiance of the photovoltaic module's inclined surface. The photovoltaic module tilt angle is taken as 30°, and the ground reflection coefficient is taken as 0.2.

[0114] Step I: Substitute the measured ambient temperature prepared in Step D, the effective irradiance of the photovoltaic module slope obtained in Step H, and the temperature correction coefficient into formula (7) to calculate the surface temperature of the photovoltaic module. The temperature correction coefficient is obtained by correcting the actual operating data using an autoregressive method, and is set to 0.05 in this example.

[0115] Step J: Based on the equipment parameters under standard operating conditions of the photovoltaic module, substitute the effective irradiance obtained in step H into formulas (8) and (9). The standard solar irradiance value is taken as 1000 W / m², the standard module temperature value is taken as 25ºC, and the base value of the natural logarithm is taken as 2.71828. The compensation coefficients a, b, and c are obtained by fitting the module experimental data, and in this example, they are taken as 0.001, 0.0005, and 0.002, respectively. The optimal output current and optimal output voltage of the module under the current meteorological conditions are calculated.

[0116] Step K: Substitute the optimal output voltage and optimal output current obtained in step J into formula (10) to calculate the DC output power of the photovoltaic module.

[0117] Step L: Based on the DC output power of the photovoltaic module calculated in step K, the theoretical power generation of the distributed photovoltaic is calculated according to formula (11). Among them, the conversion coefficient from the DC side of the photovoltaic module to the output power of the inverter can be taken as an empirical value in the range of 94.5%-98%, the rated capacity of the distributed photovoltaic in the region is 3570MW, and the rated capacity of the meteorological data extrapolation model is taken as the rated capacity of the standard module 300W.

[0118] Step M: Based on the theoretical power generation of distributed photovoltaic power calculated in step L, the available power generation of distributed photovoltaic power is calculated according to formula (12). The available power generation mapping coefficient is obtained by comprehensive analysis of the historical operating data of distributed photovoltaic power stations or centralized photovoltaic power stations in the vicinity. In this example, it is taken as 0.7.

[0119] Step N: The available power generation mapping coefficient Kav should be combined with historical data of the actual power generation of distributed photovoltaic power during unrestricted periods and checked annually.

[0120] Step O: Regularly test the rationality of the calculation of available power generation of distributed photovoltaic power. During the period when power generation is not subject to power curtailment (no less than 6 hours), the relative error between the available power generation and the actual power generation during the period should not exceed 5% in principle. If the deviation is large, the selection of the sample inverter should be adjusted in time, or the parameters and strategies of the meteorological data extrapolation method should be adjusted.

[0121] Step P: Obtain the available power generation of distributed photovoltaic power by accumulating the available power generation during the statistical period, and substitute it into the distributed photovoltaic power generation calculated in step M according to formula (14) to obtain the available power generation of distributed photovoltaic power generation.

[0122] Step Q: Obtain the actual power generation of distributed photovoltaics by accumulating the actual power generation of all distributed photovoltaics in the region, and substitute the measured operation data prepared in step B into formula (15) to obtain the actual power generation.

[0123] This invention adapts to the characteristics of scattered distributed photovoltaic data and poor monitoring conditions through a "dual-model switching triggered by data integrity rate" mechanism. It can achieve high-precision assessment without adding new monitoring equipment. In the case of missing data, the assessment accuracy is improved by 15%-20% compared with existing methods, and the implementation cost is reduced by more than 40%. At the same time, through standardized statistics of restricted power and full-process verification, the reliability of the results is ensured, which can directly support grid dispatch, operation and maintenance optimization and policy formulation.

[0124] This invention provides a method for assessing the available power generation of distributed photovoltaic (PV) power, which is applicable to scenarios such as monitoring and assessing the distributed PV absorption capacity of power grid companies and evaluating the regional PV absorption performance of energy management departments. It can solve the problem of large data discrepancies faced by centralized PV assessment methods that cannot be adapted to distributed PV assessment. Through a dual-model switching mechanism of a prototype inverter, it can achieve the assessment of the available power generation of distributed PV without the need for additional monitoring equipment.

[0125] Example 3 This invention also provides a distributed photovoltaic available power generation assessment system, such as... Figure 3 As shown, it includes: The first determining unit is used to determine the sample inverter for the area to be evaluated; The data acquisition unit is used to collect distributed photovoltaic power generation data, meteorological data, and relevant data from the sample inverter in the area to be evaluated. The second determining unit is used to determine the available power generation of distributed photovoltaic power based on the state of the sample inverter and using relevant data from the sample inverter, or to determine the available power generation of distributed photovoltaic power using distributed photovoltaic power generation data and meteorological data.

[0126] Furthermore, the first determining unit is specifically used for: Inverter units or distributed photovoltaic power stations that are not subject to control within the area to be evaluated are selected as model inverters.

[0127] Furthermore, distributed photovoltaic (PV) power generation data includes: ledger data for distributed PV power generation and operational data for distributed PV power generation; The ledger data for distributed photovoltaic power generation should include at least the following two types: grid-connected installed capacity and project location latitude and longitude. The operational data for distributed photovoltaic (PV) power generation should include at least the following two types: active power of distributed PV and daily power generation. Meteorological data should include at least the following four types: total irradiance, direct irradiance, diffuse irradiance, and temperature.

[0128] Furthermore, relevant data for the prototype inverter includes: basic data and operating data of the prototype inverter; The basic data of the prototype inverter should include at least the following five types: the name of the photovoltaic power station where the prototype inverter is located, the latitude and longitude of the photovoltaic power station where the prototype inverter is located, the rated capacity of the prototype inverter, the number of prototype inverters, and the equipment parameters of the photovoltaic modules under standard operating conditions. The operating data of the prototype inverter should include at least the following three types: active power, daily power generation, and operating status.

[0129] Furthermore, the second determining unit includes: The first calculation module is used to calculate the theoretical power generation of distributed photovoltaic power using relevant data from the prototype inverter when the prototype inverter is operating normally; and to calculate the theoretical power generation of distributed photovoltaic power using distributed photovoltaic power generation data and meteorological data when the prototype inverter is operating abnormally.

[0130] Furthermore, when the prototype inverter is operating in an abnormal state, the first calculation module includes: The first calculation submodule is used to calculate the solar incidence angle at the location of the distributed photovoltaic system using the solar altitude angle and solar azimuth angle at the location of the distributed photovoltaic system. The second calculation submodule is used to calculate the effective irradiance of the inclined surface of the photovoltaic module using the solar incidence angle. The third calculation submodule is used to calculate the surface temperature of the photovoltaic module using the effective irradiance of the inclined surface of the photovoltaic module. The fourth calculation submodule is used to calculate the surface temperature difference of the photovoltaic module using the surface temperature of the photovoltaic module. The fifth calculation submodule is used to calculate the optimal output current and optimal output voltage of the photovoltaic module under the current meteorological conditions by utilizing the temperature difference on the surface of the photovoltaic module. The sixth calculation submodule is used to calculate the DC output power of the photovoltaic module using the optimal output current and optimal output voltage of the photovoltaic module. The seventh calculation submodule is used to calculate the theoretical power generation of distributed photovoltaics using the DC output power of the photovoltaic modules.

[0131] Furthermore, the second computing module includes: The eighth calculation submodule is used to calculate the available power generation of distributed photovoltaics using the theoretical power generation of distributed photovoltaics.

[0132] Furthermore, the distributed photovoltaic power station is a 10kV distributed photovoltaic power station.

[0133] Furthermore, when the prototype inverter is operating in normal condition, the formula for calculating the theoretical power generation of distributed photovoltaic power includes:

[0134] In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. Y The number of distributed photovoltaic (PV) model inverters in the region. N y Within the region, the first y The rated capacity of the distributed photovoltaic system is represented by a single model inverter. M y For the first y The rated capacity of a sample inverter p y Let y be the actual power generation of the y-th sample inverter.

[0135] Furthermore, the formula for calculating the solar altitude angle includes:

[0136] The formula for calculating the solar azimuth angle includes:

[0137] The formula for calculating the hour angle at the location of distributed photovoltaic power generation includes:

[0138] In the above formula, For the hour angle, To predict the number of hours from local mean solar noon, The solar altitude angle, Geographical latitude, The declination angle, This is the solar azimuth angle.

[0139] Furthermore, the formula for calculating the solar incidence angle includes:

[0140] In the above formula, The angle of incidence of the sun. The solar altitude angle, The azimuth of the sun. For the azimuth angle of the photovoltaic module, The tilt angle of the photovoltaic module.

[0141] Furthermore, the formula for calculating the effective irradiance of the inclined surface of a photovoltaic module includes:

[0142] In the above formula, The effective irradiance of the inclined surface of the photovoltaic module. Direct radiation intensity measured by meteorological monitoring equipment; The angle of incidence of the sun. The intensity of diffused radiation measured by meteorological monitoring equipment. For the tilt angle of photovoltaic modules, Ground reflectance coefficient, Total irradiance measured by meteorological monitoring equipment.

[0143] Furthermore, the formula for calculating the surface temperature of a photovoltaic module includes:

[0144] The formula for calculating the surface temperature difference of a photovoltaic module includes:

[0145] In the above formula, The surface temperature of the photovoltaic module. For ambient temperature, This is the temperature correction factor. The effective irradiance of the inclined surface of the photovoltaic module. For the temperature difference of the photovoltaic module surface, This refers to the standard component temperature.

[0146] Furthermore, the formula for calculating the optimal output current of photovoltaic modules under current meteorological conditions includes:

[0147] The formula for calculating the optimal output voltage of photovoltaic modules under current meteorological conditions includes:

[0148] The formula for calculating the difference between the actual irradiance and the standard irradiance includes:

[0149] In the above formula, The optimal output current for the component under current weather conditions. This represents the optimal output current of the photovoltaic module under standard operating conditions. The effective irradiance of the inclined surface of the photovoltaic module. Standard solar irradiance, , b and c For compensation coefficient, This represents the difference between the actual component temperature and the standard component temperature. The optimal output voltage for the component under current weather conditions. Let be the optimal output voltage of the photovoltaic module under standard operating conditions, and e be the base of the natural logarithm. This is the difference between the actual irradiance and the standard irradiance.

[0150] Furthermore, the formula for calculating the DC output power of photovoltaic modules includes:

[0151] In the above formula, This refers to the DC output power of the photovoltaic module. The optimal output voltage for the component under current weather conditions; This is the optimal output current for the component under the current weather conditions.

[0152] Furthermore, the formula for calculating the theoretical power generation of distributed photovoltaic systems includes:

[0153] In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. K 1 represents the conversion coefficient from the DC side of the photovoltaic module to the output power of the inverter. P dc For the DC output power of photovoltaic modules, s ar This represents the total rated capacity of distributed photovoltaic power within the region. s st This is the rated capacity of the meteorological data extrapolation model.

[0154] Furthermore, the formula for calculating the available power generation of distributed photovoltaic systems includes:

[0155] The formula for calculating the available power generation of distributed photovoltaic power includes:

[0156] In the above formula, , T This is the total time point; P av The available power generation capacity of distributed photovoltaic systems. K av The available power generation mapping coefficient, P th This represents the theoretical power generation of distributed photovoltaic systems. This refers to the available power generation from distributed photovoltaic systems. for t Available power generation of distributed photovoltaic systems at any given time. The time interval for calculating the available power generation of distributed photovoltaic systems.

[0157] Furthermore, the formula for calculating the actual power generation of distributed photovoltaic power includes:

[0158] In the above formula, , N This represents the total number of distributed photovoltaic clusters. , T This is the total time point; This represents the actual power generation of distributed photovoltaic systems. for t Distributed photovoltaic power at all times n Actual power generation This represents the time interval for collecting the actual power generation of distributed photovoltaic systems.

[0159] It is understood that the system embodiments provided above correspond to the method embodiments described above, and the specific details can be referred to each other, which will not be repeated here.

[0160] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0161] Example 4 like Figure 4 As shown, the present invention also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, processor, and transceiver component are connected via a bus; the memory can be used to store executable programs, and an exemplary executable program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0162] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to realize the corresponding method flow or corresponding function, so as to realize the steps of the distributed photovoltaic available power generation assessment method in the above embodiments.

[0163] Example 5 Based on the same inventive concept, this invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device used to store programs and data. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the distributed photovoltaic power generation usable power assessment method in the above embodiments.

[0164] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can 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, etc.) containing computer-usable program code.

[0165] This 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 block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can 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, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0166] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0167] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for assessing the available power generation of distributed photovoltaic systems, characterized in that, include: Identify the sample inverter for the area to be evaluated; Collect distributed photovoltaic power generation data, meteorological data, and relevant data from the model inverter in the area to be evaluated; Based on the status of the sample inverter, the available power generation capacity of distributed photovoltaic power can be determined using the relevant data of the sample inverter, or the available power generation capacity of distributed photovoltaic power can be determined using the distributed photovoltaic power generation data and the meteorological data.

2. The method according to claim 1, characterized in that, The sample inverter for determining the region to be evaluated includes: Inverter units or distributed photovoltaic power stations that are not subject to control within the area to be evaluated are selected as model inverters.

3. The method according to claim 1, characterized in that, The distributed photovoltaic power generation data includes: the ledger data of the distributed photovoltaic power generation and the operation data of the distributed photovoltaic power generation; The ledger data for distributed photovoltaic power generation shall include at least the following two types: grid-connected installed capacity and project location latitude and longitude. The operational data of the distributed photovoltaic power generation shall include at least the following two types: active power of distributed photovoltaic power generation and daily power generation. The meteorological data includes at least the following four types: total irradiance, direct irradiance, diffuse irradiance, and temperature.

4. The method according to claim 3, characterized in that, The relevant data of the prototype inverter includes: the basic data of the prototype inverter and the operating data of the prototype inverter; The basic data of the prototype inverter includes at least the following five types: the name of the photovoltaic power station where the prototype inverter is located, the latitude and longitude of the photovoltaic power station where the prototype inverter is located, the rated capacity of the prototype inverter, the number of prototype inverters, and the equipment parameters of the photovoltaic modules under standard operating conditions; The operating data of the prototype inverter includes at least the following three types: active power, daily power generation, and operating status.

5. The method according to claim 4, characterized in that, The determination of available distributed photovoltaic (PV) power generation based on the state of the sample inverter and using relevant data from the sample inverter, or the determination of available distributed PV power generation based on the distributed PV power generation data and the meteorological data, includes: When the prototype inverter is operating normally, the theoretical power generation of distributed photovoltaic power is calculated using the relevant data of the prototype inverter; when the prototype inverter is operating abnormally, the theoretical power generation of distributed photovoltaic power is calculated using the distributed photovoltaic power generation data and the meteorological data. The available power generation of distributed photovoltaics is calculated using the theoretical power generation of the distributed photovoltaic system.

6. The method according to claim 5, characterized in that, When the prototype inverter is operating in an abnormal state, the theoretical power generation of the distributed photovoltaic system is calculated using the distributed photovoltaic power generation data and the meteorological data, including: The solar altitude angle and solar azimuth angle at the location of the distributed photovoltaic system are used to calculate the solar incidence angle at the location of the distributed photovoltaic system. The effective irradiance of the inclined surface of the photovoltaic module is calculated using the solar incident angle. The surface temperature of the photovoltaic module is calculated using the effective irradiance of the inclined surface of the photovoltaic module. The surface temperature difference of the photovoltaic module is calculated using the surface temperature of the photovoltaic module. Using the temperature difference on the surface of the photovoltaic module, the optimal output current and the optimal output voltage of the photovoltaic module under the current meteorological conditions are calculated respectively. The DC output power of the photovoltaic module is calculated using the optimal output current and the optimal output voltage of the photovoltaic module. The theoretical power generation of the distributed photovoltaic system is calculated using the DC output power of the photovoltaic module.

7. The method according to claim 2, characterized in that, The distributed photovoltaic power station is a 10kV distributed photovoltaic power station.

8. The method according to claim 5, characterized in that, When the prototype inverter is in normal operating condition, the formula for calculating the theoretical power generation of the distributed photovoltaic system includes: In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. Y The number of distributed photovoltaic (PV) model inverters in the region. N y Within the region, the first y The rated capacity of the distributed photovoltaic system is represented by a single model inverter. M y For the first y The rated capacity of a sample inverter p y Let y be the actual power generation of the y-th sample inverter.

9. The method according to claim 6, characterized in that, The formula for calculating the solar altitude angle includes: The formula for calculating the solar azimuth angle includes: The formula for calculating the hour angle at the location of distributed photovoltaic power generation includes: In the above formula, For the hour angle, To predict the number of hours from local mean solar noon, The solar altitude angle, Geographical latitude, The declination angle, This is the solar azimuth angle.

10. The method according to claim 6, characterized in that, The formula for calculating the solar incidence angle includes: In the above formula, The angle of incidence of the sun. The solar altitude angle, The azimuth of the sun. For the azimuth angle of the photovoltaic module, The tilt angle of the photovoltaic module.

11. The method according to claim 6, characterized in that, The formula for calculating the effective irradiance of the inclined surface of the photovoltaic module includes: In the above formula, The effective irradiance of the inclined surface of the photovoltaic module. Direct radiation intensity measured by meteorological monitoring equipment; The angle of incidence of the sun. The intensity of diffused radiation measured by meteorological monitoring equipment. For the tilt angle of photovoltaic modules, Ground reflectance coefficient, Total irradiance measured by meteorological monitoring equipment.

12. The method according to claim 6, characterized in that, The formula for calculating the surface temperature of the photovoltaic module includes: The formula for calculating the surface temperature difference of the photovoltaic module includes: In the above formula, The surface temperature of the photovoltaic module. For ambient temperature, This is the temperature correction factor. The effective irradiance of the inclined surface of the photovoltaic module. For the temperature difference of the photovoltaic module surface, This refers to the standard component temperature.

13. The method according to claim 6, characterized in that, The formula for calculating the optimal output current of the photovoltaic module under the current meteorological conditions includes: The formula for calculating the optimal output voltage of the photovoltaic module under the current meteorological conditions includes: The formula for calculating the difference between the actual irradiance and the standard irradiance includes: In the above formula, The optimal output current for the component under current weather conditions. This represents the optimal output current of the photovoltaic module under standard operating conditions. The effective irradiance of the inclined surface of the photovoltaic module. Standard solar irradiance, , b and c For compensation coefficient, This represents the difference between the actual component temperature and the standard component temperature. The optimal output voltage for the component under current weather conditions. Let be the optimal output voltage of the photovoltaic module under standard operating conditions, and e be the base of the natural logarithm. This is the difference between the actual irradiance and the standard irradiance.

14. The method according to claim 6, characterized in that, The formula for calculating the DC output power of the photovoltaic module includes: In the above formula, This refers to the DC output power of the photovoltaic module. The optimal output voltage for the component under current weather conditions; This is the optimal output current for the component under the current weather conditions.

15. The method according to claim 6, characterized in that, The formula for calculating the theoretical power generation of distributed photovoltaic systems includes: In the above formula, P th This represents the theoretical power generation of distributed photovoltaic systems. K 1 represents the conversion coefficient from the DC side of the photovoltaic module to the output power of the inverter. P dc For the DC output power of photovoltaic modules, s ar This represents the total rated capacity of distributed photovoltaic power within the region. s st This is the rated capacity of the meteorological data extrapolation model.

16. The method according to claim 5, characterized in that, The formula for calculating the available power generation of distributed photovoltaic power includes: In the above formula, P av The available power generation capacity of distributed photovoltaic systems. K av The available power generation mapping coefficient, P th This represents the theoretical power generation of distributed photovoltaic systems.

17. A distributed photovoltaic available power generation assessment system, characterized in that, include: The first determining unit is used to determine the sample inverter for the area to be evaluated; The data acquisition unit is used to collect distributed photovoltaic power generation data, meteorological data, and relevant data of the sample inverter in the area to be evaluated. The second determining unit is used to determine the available power generation of distributed photovoltaic power based on the state of the sample inverter and using relevant data from the sample inverter, or to determine the available power generation of distributed photovoltaic power using the distributed photovoltaic power generation data and the meteorological data.

18. The system according to claim 17, characterized in that, The first determining unit is specifically used for: Inverter units or distributed photovoltaic power stations that are not subject to control within the area to be evaluated are selected as model inverters.

19. The system according to claim 17, characterized in that, The distributed photovoltaic power generation data includes: the ledger data of the distributed photovoltaic power generation and the operation data of the distributed photovoltaic power generation; The ledger data for distributed photovoltaic power generation shall include at least the following two types: grid-connected installed capacity and project location latitude and longitude. The operational data of the distributed photovoltaic power generation shall include at least the following two types: active power of distributed photovoltaic power generation and daily power generation. The meteorological data includes at least the following four types: total irradiance, direct irradiance, diffuse irradiance, and temperature.

20. The system according to claim 18, characterized in that, The relevant data of the prototype inverter includes: the basic data of the prototype inverter and the operating data of the prototype inverter; The basic data of the prototype inverter includes at least the following five types: the name of the photovoltaic power station where the prototype inverter is located, the latitude and longitude of the photovoltaic power station where the prototype inverter is located, the rated capacity of the prototype inverter, the number of prototype inverters, and the equipment parameters of the photovoltaic modules under standard operating conditions; The operating data of the prototype inverter includes at least the following three types: active power, daily power generation, and operating status.

21. The system according to claim 20, characterized in that, The second determining unit includes: The first calculation module is used to calculate the theoretical power generation of distributed photovoltaic power using relevant data of the sample inverter when the sample inverter is operating normally; and to calculate the theoretical power generation of distributed photovoltaic power using distributed photovoltaic power generation data and meteorological data when the sample inverter is operating abnormally. The second calculation module is used to calculate the available power generation of the distributed photovoltaic system using the theoretical power generation of the distributed photovoltaic system.

22. The system according to claim 21, characterized in that, When the prototype inverter is in an abnormal operating state, the first calculation module includes: The first calculation submodule is used to calculate the solar incidence angle at the location of the distributed photovoltaic system using the solar altitude angle and solar azimuth angle at the location of the distributed photovoltaic system. The second calculation submodule is used to calculate the effective irradiance of the inclined surface of the photovoltaic module using the solar incidence angle. The third calculation submodule is used to calculate the surface temperature of the photovoltaic module using the effective irradiance of the inclined surface of the photovoltaic module. The fourth calculation submodule is used to calculate the surface temperature difference of the photovoltaic module using the surface temperature of the photovoltaic module. The fifth calculation submodule is used to calculate the optimal output current and optimal output voltage of the photovoltaic module under the current meteorological conditions by utilizing the temperature difference on the surface of the photovoltaic module. The sixth calculation submodule is used to calculate the DC output power of the photovoltaic module using the optimal output current and the optimal output voltage of the photovoltaic module. The seventh calculation submodule is used to calculate the theoretical power generation of the distributed photovoltaic system using the DC output power of the photovoltaic module.

23. The system according to claim 21, characterized in that, The second computing module includes: The eighth calculation submodule is used to calculate the available power generation of distributed photovoltaics using the theoretical power generation of the distributed photovoltaic system.

24. The system according to claim 19, characterized in that, The distributed photovoltaic power station is a 10kV distributed photovoltaic power station.

25. An electronic device, characterized in that, include: At least one processor and memory; The memory and processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the method for assessing the available power generation of distributed photovoltaic systems as described in any one of claims 1 to 16 is implemented.

26. A readable storage medium, characterized in that, It contains an execution program, which, when executed, implements the method for assessing the available power generation of distributed photovoltaic systems as described in any one of claims 1 to 16.

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