Method and system for determining energy efficiency ratio of photovoltaic power station

Abstract

The invention provides a method and a system for determining the energy efficiency ratio of a photovoltaic power station. The method comprises the following steps: acquiring the output power of the photovoltaic power station at each moment within a preset duration, the temperature of a photovoltaic module and the slope irradiance; according to the temperature of the photovoltaic module at each moment in a preset duration, determining a correction coefficient at each moment in the preset duration; and determining the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, the output power and the slope irradiance at each moment within the preset duration. According to the technical scheme provided by the invention, the difference caused by the difference between the actual component temperature and the annual array temperature condition can be compensated, and the precision of the energy efficiency ratio of the photovoltaic power station is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic power station benefit evaluation, and in particular to a method and system for determining the energy efficiency ratio of a photovoltaic power station. Background Art

[0002] Calculation of photovoltaic power station energy efficiency is the main way to measure the power generation efficiency of the power station, which can help power station managers understand the loss of the power station. At present, the calculation method of energy efficiency calculation indicators mostly adopts the calculation method specified in the industry standard IEC61724-1:2021, among which the system energy efficiency ratio (PR value) is the most widely used primary indicator for measuring the energy efficiency of power stations.

[0003] In the existing technology, the calculation method in the domestic energy industry standard IEC61724-1:2021 is usually used to calculate the system standard energy efficiency ratio. However, the irradiation changes in real time, resulting in inaccurate calculation results. Therefore, it is urgent to propose a solution that can accurately calculate the energy efficiency ratio of photovoltaic power stations. Summary of the invention

[0004] The present application provides a method and system for determining the energy efficiency ratio of a photovoltaic power station, so as to at least solve the technical problem of inaccurate calculation results.

[0005] The first embodiment of the present application provides a method for determining an energy efficiency ratio of a photovoltaic power station, the method comprising:

[0006] Obtain the output power, temperature of photovoltaic modules, and slope irradiance of the photovoltaic power station at each moment within a preset time period;

[0007] Determining a correction coefficient at each moment within a preset time period according to the temperature of the photovoltaic module at each moment within the preset time period;

[0008] The energy efficiency ratio of the photovoltaic power station is determined according to the correction coefficient, output power and slope irradiance at each moment within the preset time period.

[0009] Preferably, determining the correction coefficient at each moment within the preset time period according to the temperature of the photovoltaic assembly at each moment within the preset time period includes:

[0010] Obtain the average temperature of the photovoltaic module cells in the historical period and the maximum power temperature coefficient of the photovoltaic module;

[0011] Determine the difference between the temperature of the photovoltaic module at each moment and the average temperature in the historical period respectively, and obtain a first temperature difference at each moment;

[0012] The product of the first temperature difference at each moment and the maximum power temperature coefficient is added with 1 to obtain the correction coefficient at each moment within the preset time length.

[0013] Furthermore, the energy efficiency ratio of the photovoltaic power station is determined according to the correction coefficient, output power and slope irradiance at each moment within the preset time period, including:

[0014] Determining the total output power of the photovoltaic power station within a preset time period according to the output power at each moment;

[0015] Obtain the installed capacity and standard irradiance of the photovoltaic power station

[0016] The energy efficiency ratio of the photovoltaic power station is determined according to the total output power within the preset time period, the correction coefficient at each moment, the slope irradiance, the installed capacity of the photovoltaic power station, and the standard irradiance.

[0017] Furthermore, the calculation formula of the energy efficiency ratio of the photovoltaic power station is as follows:

[0018]

[0019] In the formula, PR STC is the energy efficiency ratio of photovoltaic power station, P T is the total output power of the photovoltaic power station within the preset time T, C k is the correction coefficient at time k, P0 is the installed capacity of the photovoltaic power station, G k is the slope irradiation at time k, G ref is the standard irradiance, τ k The time interval between moments.

[0020] The second embodiment of the present application provides a photovoltaic power station energy efficiency ratio determination system, including:

[0021] An acquisition module is used to obtain the output power, temperature of photovoltaic modules, and slope irradiance of the photovoltaic power station at each moment within a preset time period;

[0022] A first determination module, configured to determine a correction coefficient at each moment within a preset time period according to the temperature of the photovoltaic module at each moment within the preset time period;

[0023] The second determination module is used to determine the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, output power and slope irradiance at each moment within the preset time period.

[0024] Preferably, the first determining module includes:

[0025] The first acquisition unit is used to acquire the average temperature of the cell of the photovoltaic module in the historical period and the maximum power temperature coefficient of the photovoltaic module;

[0026] A first determining unit, used to respectively determine the difference between the temperature of the photovoltaic assembly at each moment and the average temperature in the historical period, to obtain a first temperature difference at each moment;

[0027] The second determination unit is used to add 1 to the product of the first temperature difference at each moment and the maximum power temperature coefficient, so as to obtain the correction coefficient at each moment within the preset time length.

[0028] Furthermore, the second determining module includes:

[0029] A third determining unit, configured to determine the total output power of the photovoltaic power station within a preset time period according to the output power at each moment;

[0030] The second acquisition unit is used to obtain the installed capacity and standard irradiance of the photovoltaic power station.

[0031] The fourth determination unit is used to determine the energy efficiency ratio of the photovoltaic power station according to the total output power within the preset time period, the correction coefficient at each moment, the slope irradiance, the installed capacity of the photovoltaic power station, and the standard irradiance.

[0032] Furthermore, the calculation formula of the energy efficiency ratio of the photovoltaic power station is as follows:

[0033]

[0034] In the formula, PR STC is the energy efficiency ratio of photovoltaic power station, P T is the total output power of the photovoltaic power station within the preset time T, C k is the correction coefficient at time k, P0 is the installed capacity of the photovoltaic power station, G k is the slope irradiation at time k, G ref is the standard irradiance, τ k The time interval between moments.

[0035] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in the first aspect is implemented.

[0036] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in the first aspect of the present application.

[0037] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0038] The present application proposes a method and system for determining the energy efficiency ratio of a photovoltaic power station, the method comprising: obtaining the output power, temperature of photovoltaic modules, and slope irradiance of the photovoltaic power station at each moment within a preset time; determining the correction coefficient at each moment within the preset time according to the temperature of the photovoltaic modules at each moment within the preset time; determining the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, output power, and slope irradiance at each moment within the preset time. The technical solution proposed in the present application can compensate for the difference caused by the difference between the actual module temperature and the temperature conditions of the array throughout the year, thereby improving the accuracy of the energy efficiency ratio of the photovoltaic power station.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0041] Figure 1 A flowchart of a method for determining an energy efficiency ratio of a photovoltaic power station provided according to an embodiment of the present application;

[0042] Figure 2 A structural diagram of a photovoltaic power station energy efficiency ratio determination system provided according to an embodiment of the present application;

[0043] Figure 3 A structural diagram of a first determination module provided according to an embodiment of the present application;

[0044] Figure 4 It is a structural diagram of a second determination module provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0046] The present application proposes a method and system for determining the energy efficiency ratio of a photovoltaic power station, the method comprising: obtaining the output power, temperature of the photovoltaic module, and slope irradiance of the photovoltaic power station at each moment within a preset time; determining the correction coefficient at each moment within the preset time according to the temperature of the photovoltaic module at each moment within the preset time; determining the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, output power, and slope irradiance at each moment within the preset time. The technical solution proposed in the present application can compensate for the difference caused by the difference between the actual module temperature and the array temperature conditions throughout the year, thereby improving the accuracy of the energy efficiency ratio of the photovoltaic power station.

[0047] A method and system for determining an energy efficiency ratio of a photovoltaic power station according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0048] Embodiment 1

[0049] Figure 1 A flowchart of a method for determining an energy efficiency ratio of a photovoltaic power station provided according to an embodiment of the present application is shown in FIG. Figure 1 As shown, the method includes:

[0050] Step 1: Obtain the output power, temperature of photovoltaic modules, and slope irradiance of the photovoltaic power station at each moment within a preset time.

[0051] Step 2: Determine the correction coefficient at each moment within the preset time period according to the temperature of the photovoltaic module at each moment within the preset time period.

[0052] In the embodiment of the present disclosure, step 2 specifically includes:

[0053] Obtain the average temperature of the photovoltaic module cells in the historical period and the maximum power temperature coefficient of the photovoltaic module;

[0054] Determine the difference between the temperature of the photovoltaic module at each moment and the average temperature in the historical period respectively, and obtain a first temperature difference at each moment;

[0055] The product of the first temperature difference at each moment and the maximum power temperature coefficient is added with 1 to obtain the correction coefficient at each moment within the preset time length.

[0056] For example, the calculation formula of the correction coefficient at each moment within the preset time period is as follows:

[0057] C k =1+γ×(T mod,k –T ArrWtd )

[0058] In the formula, C k is the correction coefficient at time k, γ is the maximum power temperature coefficient of the photovoltaic module, T mod,k is the temperature of the photovoltaic module at time k, T ArrWtdIt is the average temperature of the photovoltaic module cells during the historical period.

[0059] Step 3: Determine the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, output power and slope irradiance at each moment within the preset time period.

[0060] In the embodiment of the present disclosure, step 3 specifically includes:

[0061] Determining the total output power of the photovoltaic power station within a preset time period according to the output power at each moment;

[0062] The calculation formula of the total output power within the preset time period is as follows:

[0063]

[0064] Where P out,k is the output power at time k, k∈[1-T], T is the preset duration.

[0065] Obtain the installed capacity and standard irradiance of the photovoltaic power station

[0066] The energy efficiency ratio of the photovoltaic power station is determined according to the total output power within the preset time period, the correction coefficient at each moment, the slope irradiance, the installed capacity of the photovoltaic power station, and the standard irradiance.

[0067] The calculation formula of the energy efficiency ratio of the photovoltaic power station is as follows:

[0068]

[0069] In the formula, PR STC is the energy efficiency ratio of photovoltaic power station, P T is the total output power of the photovoltaic power station within the preset time T, C k is the correction coefficient at time k, P0 is the installed capacity of the photovoltaic power station, G k is the slope irradiation at time k, G ref is the standard irradiance, τ k The time interval between moments.

[0070] In summary, the method for determining the energy efficiency ratio of a photovoltaic power station proposed in this embodiment can compensate for the difference caused by the difference between the actual component temperature and the array temperature conditions throughout the year, thereby improving the accuracy of the energy efficiency ratio of the photovoltaic power station.

[0071] Embodiment 2

[0072] Figure 2 A structural diagram of a photovoltaic power station energy efficiency ratio determination system provided according to an embodiment of the present application, such as Figure 2 As shown, the system comprises:

[0073] An acquisition module 100 is used to acquire the output power, temperature of the photovoltaic modules, and slope irradiance of the photovoltaic power station at each moment within a preset time period;

[0074] A first determination module 200, configured to determine a correction coefficient at each moment within a preset time period according to the temperature of the photovoltaic module at each moment within the preset time period;

[0075] The second determination module 300 is used to determine the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, output power and slope irradiance at each moment within the preset time period.

[0076] In the embodiments of the present disclosure, Figure 3 As shown, the first determination module 200 includes:

[0077] The first acquisition unit 201 is used to acquire the average temperature of the cell of the photovoltaic module in the historical period and the maximum power temperature coefficient of the photovoltaic module;

[0078] A first determining unit 202 is used to determine the difference between the temperature of the photovoltaic module at each moment and the average temperature in the historical period, and obtain a first temperature difference at each moment;

[0079] The second determining unit 203 is used to add 1 to the product of the first temperature difference at each moment and the maximum power temperature coefficient, so as to obtain the correction coefficient at each moment within the preset time period.

[0080] In the embodiments of the present disclosure, Figure 4 As shown, the second determination module 300 includes:

[0081] The third determining unit 301 is used to determine the total output power of the photovoltaic power station within a preset time period according to the output power at each moment;

[0082] The second acquisition unit 302 is used to acquire the installed capacity and standard irradiance of the photovoltaic power station.

[0083] The fourth determining unit 303 is used to determine the energy efficiency ratio of the photovoltaic power station according to the total output power within the preset time period, the correction coefficient at each moment, the slope irradiance, the installed capacity of the photovoltaic power station, and the standard irradiance.

[0084] The calculation formula of the energy efficiency ratio of the photovoltaic power station is as follows:

[0085]

[0086] In the formula, PR STC is the energy efficiency ratio of photovoltaic power station, P T is the total output power of the photovoltaic power station within the preset time T, C kis the correction coefficient at time k, P0 is the installed capacity of the photovoltaic power station, G k is the slope irradiation at time k, G ref is the standard irradiance, τ k The time interval between moments.

[0087] In summary, the photovoltaic power station energy efficiency ratio determination system proposed in this embodiment can compensate for the difference caused by the difference between the actual component temperature and the array temperature conditions throughout the year, thereby improving the accuracy of the photovoltaic power station energy efficiency ratio.

[0088] Embodiment 3

[0089] In order to implement the above embodiments, the present disclosure further proposes an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in Embodiment 1 is implemented.

[0090] Embodiment 4

[0091] In order to implement the above embodiments, the present disclosure further proposes a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method described in the first embodiment is implemented.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0093] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0094] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for determining the energy efficiency ratio of a photovoltaic power station, characterized in that: The method comprises: Obtain the output power, temperature of photovoltaic modules, and slope irradiance of the photovoltaic power station at each moment within a preset time period; Determining a correction coefficient at each moment within a preset time period according to the temperature of the photovoltaic module at each moment within the preset time period; The energy efficiency ratio of the photovoltaic power station is determined according to the correction coefficient, output power and slope irradiance at each moment within the preset time period.

2. The method according to claim 1, characterized in that The step of determining the correction coefficient at each moment within the preset time period according to the temperature of the photovoltaic assembly at each moment within the preset time period comprises: Obtain the average temperature of the photovoltaic module cells in the historical period and the maximum power temperature coefficient of the photovoltaic module; Determine the difference between the temperature of the photovoltaic module at each moment and the average temperature in the historical period respectively, and obtain a first temperature difference at each moment; The product of the first temperature difference at each moment and the maximum power temperature coefficient is added with 1 to obtain the correction coefficient at each moment within the preset time length.

3. The method according to claim 2, characterized in that The step of determining the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, output power and slope irradiance at each moment within the preset time period includes: Determining the total output power of the photovoltaic power station within a preset time period according to the output power at each moment; Obtain the installed capacity and standard irradiance of the photovoltaic power station The energy efficiency ratio of the photovoltaic power station is determined according to the total output power within the preset time period, the correction coefficient at each moment, the slope irradiance, the installed capacity of the photovoltaic power station, and the standard irradiance.

4. The method according to claim 3, characterized in that The calculation formula of the energy efficiency ratio of the photovoltaic power station is as follows: In the formula, PR STC is the energy efficiency ratio of photovoltaic power station, P T is the total output power of the photovoltaic power station within the preset time T, C k is the correction coefficient at time k, P0 is the installed capacity of the photovoltaic power station, G k is the slope irradiation at time k, G ref is the standard irradiance, τ k The time interval between moments.

5. A photovoltaic power station energy efficiency ratio determination system, characterized in that: The system comprises: An acquisition module is used to obtain the output power, temperature of photovoltaic modules, and slope irradiance of the photovoltaic power station at each moment within a preset time period; A first determination module, configured to determine a correction coefficient at each moment within a preset time period according to the temperature of the photovoltaic module at each moment within the preset time period; The second determination module is used to determine the energy efficiency ratio of the photovoltaic power station according to the correction coefficient, output power and slope irradiance at each moment within the preset time period.

6. The system according to claim 5, characterized in that The first determining module includes: The first acquisition unit is used to acquire the average temperature of the cell of the photovoltaic module in the historical period and the maximum power temperature coefficient of the photovoltaic module; A first determining unit, used to respectively determine the difference between the temperature of the photovoltaic assembly at each moment and the average temperature in the historical period, to obtain a first temperature difference at each moment; The second determination unit is used to add 1 to the product of the first temperature difference at each moment and the maximum power temperature coefficient, so as to obtain the correction coefficient at each moment within the preset time length.

7. The system according to claim 6, characterized in that The second determining module includes: A third determining unit, configured to determine the total output power of the photovoltaic power station within a preset time period according to the output power at each moment; The second acquisition unit is used to obtain the installed capacity and standard irradiance of the photovoltaic power station. The fourth determination unit is used to determine the energy efficiency ratio of the photovoltaic power station according to the total output power within the preset time period, the correction coefficient at each moment, the slope irradiance, the installed capacity of the photovoltaic power station, and the standard irradiance.

8. The system according to claim 7, characterized in that The calculation formula of the energy efficiency ratio of the photovoltaic power station is as follows: In the formula, PR STC is the energy efficiency ratio of photovoltaic power station, P T is the total output power of the photovoltaic power station within the preset time T, C k is the correction coefficient at time k, P0 is the installed capacity of the photovoltaic power station, G k is the slope irradiation at time k, G ref is the standard irradiance, τ k The time interval between moments.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method according to any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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