Method and device for determining power loss, equipment and medium

Abstract

The invention discloses a power loss determination method, device and equipment and a medium, and relates to the technical field of wind power generation. According to the embodiment of the invention, the method comprises the steps: obtaining the first power generation efficiency of an inverter associated with a photovoltaic module in each preset time period within a first time length, and the mounting capacity of the inverter; according to the first power generation efficiency of the inverter in each preset time period, determining a dust covering loss rate of the inverter in each preset time period; and determining the power loss of the inverter in each preset time period according to the dust covering loss rate and the mounting capacity of the inverter in each preset time period. According to the embodiment of the invention, the power loss of the inverter in each time period can be determined based on the dust covering loss rate and the mounting capacity of the inverter in each time period, thereby facilitating the subsequent making of a cleaning plan of the photovoltaic module, and reducing the loss value of the power.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a method, device, equipment and medium for determining lost electricity. Background Art

[0002] The light-receiving surface of the photovoltaic modules of a photovoltaic power station will inevitably be affected by dust, which will reduce the light transmittance of the photovoltaic modules, causing their output power to drop, thereby reducing the power generation of the photovoltaic power station.

[0003] In order to reduce the power loss of the photovoltaic power station, it is necessary to formulate a cleaning plan to clean the photovoltaic components of the photovoltaic power station. For example, a suitable cleaning plan can be formulated based on the power loss of the photovoltaic components. Therefore, how to determine the power loss of the photovoltaic components is of great significance. Summary of the invention

[0004] The embodiments of the present application provide a method, device, equipment and medium for determining power loss, which can determine the power loss of a photovoltaic module.

[0005] In a first aspect, an embodiment of the present application provides a method for determining power loss, including:

[0006] Obtaining a first power generation efficiency of an inverter associated with a photovoltaic component in each preset time period within a first time period, and a mounting capacity of the inverter;

[0007] Determining the dust loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period;

[0008] The power loss of the inverter in each preset time period is determined according to the dust loss rate and the mounting capacity of the inverter in each preset time period.

[0009] In a second aspect, an embodiment of the present application provides a device for determining power loss, including: an acquisition module and a determination module;

[0010] An acquisition module, used to acquire a first power generation efficiency of an inverter associated with a photovoltaic assembly in each preset time period within a first time period, and a mounting capacity of the inverter;

[0011] A determination module, used to determine the dust loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period;

[0012] The determination module is also used to determine the power loss of the inverter in each preset time period according to the dust loss rate and the mounting capacity of the inverter in each preset time period.

[0013] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0014] processor;

[0015] a memory for storing computer program instructions;

[0016] When the computer program instructions are executed by the processor, the method according to the first aspect is implemented.

[0017] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the method described in the first aspect is implemented.

[0018] The embodiment of the present application obtains the first power generation efficiency of the inverter associated with the photovoltaic component in each preset time period within the first time length, and the mounting capacity of the inverter; determines the dust loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period; determines the power loss of the inverter in each preset time period according to the dust loss rate and mounting capacity of the inverter in each preset time period. That is, the embodiment of the present application can determine the power loss of the inverter in each time period based on the dust loss rate and mounting capacity of the inverter in each time period, which is helpful for the subsequent formulation of a cleaning plan for the photovoltaic component and reduces the power loss value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 A flowchart of a method for determining power loss provided in an embodiment of the present application;

[0021] Figure 2 A flowchart of another method for determining power loss provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a fitting curve of power generation efficiency and time period provided in an embodiment of the present application;

[0023] Figure 4 A structural diagram of a device for determining power loss provided in an embodiment of the present application;

[0024] Figure 5 A structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0026] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the guyed tower and wind turbine generator set of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0027] Photovoltaic power station is a power generation system that uses the photovoltaic effect of semiconductor materials to convert solar radiation into electrical energy. Since the energy of photovoltaic power station comes from inexhaustible solar energy, it is a clean, safe and renewable energy, so it has been vigorously developed in recent years.

[0028] After the photovoltaic power station is installed, the light-receiving surface of its photovoltaic modules will inevitably be affected by dust, which will cause the light transmittance of the photovoltaic modules to decrease and affect the power generation of the photovoltaic power station.

[0029] In order to reduce the power loss of photovoltaic power plants, a cleaning plan can be formulated to clean the photovoltaic modules of the photovoltaic power plants. Usually, the cleaning plan is related to the power loss of photovoltaic modules, that is, the power loss of photovoltaic modules is different, and the corresponding cleaning plan may be different. Therefore, it is of great significance to determine the power loss of photovoltaic modules.

[0030] The embodiments of the present application provide a method, device, equipment and medium for determining lost electricity, which can determine the lost electricity of photovoltaic components, help to subsequently formulate a cleaning plan for the photovoltaic components, and recover the lost electricity.

[0031] The following is an explanation of some of the components involved in the embodiments of the present application:

[0032] Photovoltaic module: generally refers to solar cell module, which is usually composed of high-efficiency crystalline silicon solar cells, ultra-white cloth-textured tempered glass, vinyl vinyl alcohol, transparent backplane and aluminum alloy frame, etc., and is used to absorb solar radiation energy.

[0033] Inverter: Also known as photovoltaic inverter, it is mainly used to convert the variable DC voltage generated by photovoltaic modules into AC power of the mains frequency. A photovoltaic power station usually contains multiple inverters.

[0034] Combiner box: A wiring device that ensures the orderly connection and combiner function of photovoltaic modules in a photovoltaic power generation system. This device can ensure that the photovoltaic power generation system is easy to cut off the circuit during maintenance and inspection, and can reduce the scope of power outage when a photovoltaic power generation system fails.

[0035] The following describes in detail the method, device, equipment and medium for determining the power loss provided in the embodiments of the present application through specific examples.

[0036] Figure 1 A flowchart of a method for determining power loss provided in an embodiment of the present application, such as Figure 1 As shown, the method for determining the power loss may include the following steps:

[0037] S110, obtaining a first power generation efficiency of an inverter associated with a photovoltaic assembly in each preset time period within a first time period, and a mounting capacity of the inverter.

[0038] S120: Determine a dust loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period.

[0039] S130: determining the power loss of the inverter in each preset time period according to the dust loss rate and the mounting capacity of the inverter in each preset time period.

[0040] The embodiment of the present application obtains the first power generation efficiency of the inverter associated with the photovoltaic component in each preset time period within the first time length, and the mounting capacity of the inverter; determines the dust loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period; determines the power loss of the inverter in each preset time period according to the dust loss rate and mounting capacity of the inverter in each preset time period. That is, the embodiment of the present application can determine the power loss of the inverter in each time period based on the dust loss rate and mounting capacity of the inverter in each time period, which is helpful for the subsequent formulation of a cleaning plan for the photovoltaic component and reduces the power loss value.

[0041] The above steps are described in detail below:

[0042] In S110 , in actual application, illustratively, the inverter may be directly connected to the photovoltaic module, and one inverter may be connected to one or more photovoltaic modules.

[0043] For example, the inverter may also be connected to the combiner box first, and then the combiner box is connected to the photovoltaic module, wherein one inverter may be connected to one or more combiner boxes, and one combiner box may be connected to one or more photovoltaic modules.

[0044] That is, the embodiments of the present application can be applicable to a variety of scenarios such as centralized inverters, string inverters, and distributed inverters, thereby improving versatility and flexibility.

[0045] In order to prevent false detection due to power limiting or failure of the inverter, illustratively, the embodiment of the present application only calculates the power loss of the inverter where there is no power limiting state, the current of the photovoltaic module is not zero, and there is no failure.

[0046] The first duration can be set according to actual needs, for example, it can be set to one month. The preset time period is a time period within the first duration. Taking the first duration as one month as an example, illustratively, each day can be used as a preset time period.

[0047] The first power generation efficiency may be the power generation efficiency of the inverter on a daily basis. That is, the embodiment of the present application may obtain the power generation efficiency of the inverter on a daily basis within a month, which is used to subsequently determine the dust loss rate of the inverter. The specific determination process of the power generation efficiency of the inverter may refer to the following embodiment.

[0048] The mounting capacity of the inverter is the sum of the capacities of the photovoltaic modules connected to the inverter. For example, if the inverter is a string inverter, that is, the inverter is directly connected to the photovoltaic modules, the mounting capacity of the inverter is the sum of the capacities of the photovoltaic modules in each string branch.

[0049] Exemplarily, if the inverter is a centralized inverter or a distributed inverter, that is, the inverter is connected to the photovoltaic modules through a combiner box, then the mounting capacity of the inverter is the sum of the mounting capacities of the subordinate combiner boxes, and the mounting capacity of each combiner box is the sum of the capacities of the photovoltaic modules in the subordinate string branches.

[0050] Illustratively, the embodiment of the present application can obtain the first power generation efficiency of the inverter and the mounting capacity of the inverter when the photovoltaic components are covered with dust, for subsequent calculation of power loss.

[0051] In S120, the dust loss rate is used to characterize the power generation loss rate of the inverter after the photovoltaic module is covered with dust. The dust loss rate of the inverter in each preset time period can be determined based on the first power generation efficiency of the inverter in each preset time period.

[0052] Exemplarily, the difference between the first power generation efficiency of the inverter in each preset time period and the reference power generation efficiency can be calculated, and the ratio of the difference to the reference power generation efficiency is determined as the dust loss rate of the inverter in each preset time period.

[0053] The reference power generation efficiency may be determined based on the historical power generation efficiency of the inverter. For example, a maximum value may be determined from the historical power generation efficiency and the maximum value is used as the reference power generation efficiency of the inverter.

[0054] Exemplarily, it can also be determined based on the power generation efficiency of a reference inverter. The reference inverter can be an inverter with better power generation efficiency in the photovoltaic power station. For example, the average power generation efficiency of the reference inverter in the corresponding preset time period can be determined as the reference power generation efficiency, or the maximum power generation efficiency of the reference inverter in the corresponding preset time period can be determined as the reference power generation efficiency.

[0055] Of course, other methods may also be used to calculate the dust loss rate of the inverter in each preset time period, which is not limited in the embodiment of the present application.

[0056] In S130, after the dust loss rate of the inverter in each preset time period is determined, the power loss of the inverter in each preset time period can be calculated based on the dust loss rate and the mounted capacity.

[0057] Exemplarily, the power loss of the inverter in each preset time period may be determined in the following manner:

[0058] The product value of the dust loss rate of the inverter in each preset time period and the mounting capacity is determined as the power loss of the inverter in each preset time period.

[0059] That is, for each preset time period, the product of the dust loss rate of the inverter in the preset time period and the mounting capacity of the preset time period is calculated to obtain the power loss of the inverter in the preset time period, which will help to formulate corresponding cleaning plans based on the power loss of the inverter in each preset time period to reduce power loss.

[0060] Exemplarily, the power loss of the photovoltaic power station can also be calculated based on the power loss of each inverter in the preset time period. For example, the sum of the power loss of each inverter in the preset time period can be determined as the power loss of the photovoltaic power station in the preset time period.

[0061] Exemplarily, the dust loss rate of each photovoltaic module in each preset time period can be calculated based on the dust loss rate of the inverter in each preset time period, and then the power loss of each photovoltaic module in each preset time period can be obtained based on the dust loss rate and capacity of each photovoltaic module.

[0062] Table 1 exemplarily lists the power loss of a certain photovoltaic module under different inverters in some photovoltaic power stations.

[0063] Table 1 Power loss of a PV module under different inverters in some PV power stations

[0064] area Photovoltaic power station Inverter Photovoltaic module name Power loss (kwh) A Power Station 01 Equipment 011 PV1 30.12 A Power Station 02 Equipment 021 PV2 25.32 B Power Station 03 Equipment 031 PV3 32013

[0065] Taking the direct connection between the inverter and the photovoltaic module as an example, assuming that the inverter is connected to 3 photovoltaic modules respectively, the dust loss rate of each photovoltaic module can be obtained = the dust loss rate of the inverter / 3. The loss of electricity of the photovoltaic module can be obtained by multiplying the dust loss rate of the photovoltaic module by the capacity of the photovoltaic module.

[0066] That is, the embodiment of the present application calculates the dust loss rate of the inverter according to the power generation efficiency of the inverter, and then based on the dust loss rate and the mounting capacity, the lost electricity of the inverter can be obtained, which is helpful for the subsequent formulation of a cleaning plan and reduces electricity loss.

[0067] In some embodiments, Figure 2 As shown, the method for determining the power loss may include the following steps:

[0068] S210, obtaining a first power generation efficiency of an inverter associated with a photovoltaic assembly in each preset time period within a first time period, and a mounting capacity of the inverter.

[0069] S220: Determine a target power generation efficiency according to each first power generation efficiency of the inverter.

[0070] S230: Determine a difference between a first power generation efficiency of the inverter in each preset time period and a target power generation efficiency.

[0071] S240: Determine the ratio of each difference to the target power generation efficiency as the dust loss rate of the inverter in each preset time period.

[0072] S250: Determine the power loss of the inverter in each preset time period according to the dust loss rate and the mounting capacity of the inverter in each preset time period.

[0073] The processes of S210 and S250 may refer to the above embodiment, and the other steps are described in detail below, as shown below:

[0074] In S220, the target power generation efficiency may be the best power generation efficiency of the inverter in history, which is used to calculate the dust loss rate. The target power generation efficiency may be determined based on the first power generation efficiency of the inverter in each preset time period.

[0075] Exemplarily, the target power generation efficiency may be determined by combining the power generation efficiency of the inverter in a historical period and each first power generation efficiency.

[0076] Exemplarily, the second power generation efficiency of the inverter in each preset time period within the second time period may be obtained, and at least part of the time period of the second time period is a time period when the photovoltaic components are not covered with dust and is before the first time period;

[0077] Accordingly, the above S220 may include the following steps:

[0078] Fitting the relationship between the power generation efficiency and the preset time period according to each second power generation efficiency and each first power generation efficiency;

[0079] When the relationship between the power generation efficiency and the preset time period begins to be negatively correlated, the corresponding power generation efficiency is determined as the target power generation efficiency.

[0080] Exemplarily, the second duration is the duration of the historical time period, and the second power generation efficiency is the power generation efficiency of the inverter in the historical time period, and the power generation efficiency of the inverter in the historical time period is assumed to be known. Among them, at least part of the power generation efficiency of the inverter in the historical time period is obtained when the photovoltaic components are not covered with dust. In this way, the historical best power generation efficiency of the inverter can be determined more accurately.

[0081] For example, after obtaining the second power generation efficiency of the inverter in each historical time period and the first power generation efficiency in each preset time period, the relationship between the power generation efficiency and the time period can be fitted, and the relationship can be in the form of a curve or a function.

[0082] Taking the fitting relationship between power generation efficiency and time period as an example, considering that when the photovoltaic components are covered with dust, the power generation efficiency of the corresponding inverter decreases accordingly, illustratively, when the relationship between the power generation efficiency and the time period begins to be negatively correlated, the corresponding power generation efficiency can be determined as the target power generation efficiency.

[0083] like Figure 3 As shown, the power generation efficiency of the inverter starts to decrease at t4, so the power generation efficiency of the inverter at t4 can be determined as the target power generation efficiency for subsequent calculation of the dust loss rate of the inverter.

[0084] The embodiment of the present application combines the second power generation efficiency of the inverter in the historical time period and the first power generation efficiency of the inverter in the preset time period to fit the relationship between the power generation efficiency and the time period, and determines the initial dust-covered power generation efficiency of the inverter based on the fitting relationship as the target power generation efficiency, so that the subsequent calculation of the dust cover loss rate of the inverter is more accurate.

[0085] In S230, after the target power generation efficiency is determined, the difference between the first power generation efficiency of the inverter in each preset time period and the target power generation efficiency can be determined to obtain the power generation efficiency change of the inverter in each preset time period.

[0086] In S240, for each preset time period, based on the ratio of the difference value in the preset time period to the target power generation efficiency, the dust loss rate of the inverter in the preset time period may be determined.

[0087] Exemplarily, Dri=(PRi-PRbest) / PRbest, wherein Dri is the dust loss rate of the inverter in the i-th preset time period, PRi is the first power generation efficiency of the inverter in the i-th preset time period, and PRbest is the target power generation efficiency.

[0088] The embodiment of the present application can determine the target power generation efficiency based on the first power generation efficiency of the inverter in each preset time period, and then obtain the dust loss rate of the inverter in each preset time period based on the target power generation efficiency and the first power generation efficiency in each preset time period, thereby improving the accuracy of the dust loss rate, and further improving the accuracy of the lost electricity.

[0089] In some embodiments, the first loss rate of the inverter in each preset time period may be determined in the following manner:

[0090] Divide each preset time period to obtain at least one time window;

[0091] Obtaining the operating data of the inverter in each time window and the monitoring data of the monitoring equipment of the photovoltaic module in each time window, the operating data includes the power and power generation of the inverter, and the monitoring data includes the irradiation;

[0092] The first power generation efficiency of the inverter in each preset time period is determined according to the power and power generation of the inverter in each time window and the irradiation in each time window.

[0093] In order to accurately determine the power generation efficiency of the inverter in a preset time period, illustratively, the preset time period can be divided into multiple time windows, and the size of each time window can be set according to actual needs, for example, it can be set to 10 minutes by default.

[0094] The operating data of the inverter in each time window may include the power and power generation of the inverter. The monitoring device is used to monitor the environmental data of the inverter, which may include but is not limited to the radiation amount and ambient temperature. The ambient temperature can be determined based on the backplane temperature of the monitoring device, that is, the backplane temperature of the monitoring device can be used as the ambient temperature of the environment where the inverter is located.

[0095] Exemplarily, in order to improve the accuracy of power generation efficiency, the acquired operating data of the inverter and the monitoring data of the monitoring equipment can be preprocessed. For example, dirty data and noise data caused by equipment collection and other reasons can be eliminated to improve the quality of the operating data and monitoring data.

[0096] According to the power and power generation of the inverter in each time window, combined with the radiation amount, the first power generation efficiency of the inverter in the corresponding preset time period can be determined.

[0097] This makes it convenient to calculate the dust loss rate and power loss based on the first power generation efficiency, providing a basis for formulating a cleaning plan.

[0098] Exemplarily, the first power generation efficiency of the inverter in each preset time period may be determined in the following manner:

[0099] For each time window of the preset time period, determine the load rate of the inverter in the time window according to the power and mounting capacity of the inverter;

[0100] When the load rate is greater than a preset threshold, determining a second power generation efficiency of the inverter in the time window according to the power generation of the inverter in the time window and the irradiation in the time window;

[0101] An average value of the second power generation efficiency of the inverter in each time window is determined as the first power generation efficiency of the inverter in the preset time period.

[0102] For example, the sum of the power of the inverter at each sampling time point and the sum of the mounted capacity in each time window can be calculated. Based on the sum of the power and the sum of the mounted capacity at each sampling time point, the load rate of the inverter in each time window can be calculated.

[0103] For example, Where, lrj is the load rate of the inverter in the jth time window, P ji is the power of the inverter at the i-th sampling time point in the j-th time window, C ji is the mounted capacity of the inverter at the i-th sampling time point in the j-th time window, 1≤i≤n.

[0104] Exemplarily, if lrj is less than or equal to the preset threshold, the time window is deleted and the next time window is calculated. That is, when calculating the power generation efficiency of the inverter in the corresponding preset time period, the time window is no longer considered. That is, the embodiment of the present application only considers the power generation efficiency when lrj is greater than the preset threshold, thereby eliminating the influence of weather such as cloudy and rainy days on the power generation efficiency of the inverter. The size of the preset threshold can be set according to actual needs, for example, it can be set to 30%.

[0105] Exemplarily, if lrj is greater than a preset threshold, the second power generation efficiency of the inverter in the time window can be further determined based on the irradiation in the time window and the power generation of the inverter in the time window.

[0106] Exemplarily, PRj=Ej / (Cj*Gj), where PRj is the second power generation efficiency of the inverter in the jth time window, Ej is the power generation of the inverter in the jth time window, Cj is the mounting capacity of the inverter in the jth time window, and Gj is the irradiation in the jth time window.

[0107] After the second power generation efficiency of the inverter in each time window is determined, the average value of the second power generation efficiency in each time window may be determined as the first power generation efficiency of the inverter in the corresponding preset time period.

[0108] The embodiment of the present application first calculates the load rate of the inverter in each time window based on the power and mounting capacity of the inverter in each time window. Only when the load rate is greater than a preset threshold value is the efficiency of the second generating point of the inverter in the corresponding time window further determined. This can reduce the impact of weather such as rainy days and improve the accuracy of power generation efficiency.

[0109] In some embodiments, the monitoring data of the monitoring device in each time window may also include the backplane temperature of the monitoring device, that is, the ambient temperature.

[0110] Exemplarily, the above “determining the second power generation efficiency of the inverter in the time window according to the power generation of the inverter in the time window and the irradiation in the time window” may include the following steps:

[0111] The backplane temperature is corrected using the standard temperature to obtain a correction coefficient;

[0112] Determine the product of the mount capacity, radiation exposure and correction factor;

[0113] The ratio of the power generation amount to the product value is determined as the second power generation efficiency of the inverter in the time window.

[0114] Taking into account that the ambient temperature of the inverter may deviate from the standard temperature, in order to improve the accuracy of the calculation results, the ambient temperature of the inverter can be corrected using the standard temperature to obtain a correction coefficient. Based on the correction coefficient, combined with the mounting capacity and radiation amount of the inverter, the second power generation efficiency of the inverter in each time window can be obtained.

[0115] Exemplarily, Ct=1+a*(t-t0), wherein Ct is the correction coefficient, a is a constant, exemplarily, a=-0.42% / °C, t is the ambient temperature, t0 is the standard temperature, exemplarily, t0=25°C.

[0116] Exemplarily, PRj=Ej / (Cj*Gj*Ct).

[0117] That is, the embodiment of the present application uses the standard temperature to correct the ambient temperature, thereby reducing the impact of the ambient temperature on the power generation efficiency of the inverter and improving the accuracy of the results.

[0118] After the power generation efficiency of the inverter in the preset time period is determined, it can be determined whether the photovoltaic module corresponding to the inverter is covered with dust based on the power generation efficiency.

[0119] Based on this, in some embodiments, after “determining the first power generation efficiency of the inverter in each preset time period according to the power and power generation of the inverter in each time window and the irradiation amount in each time window”, the method for determining the power loss may further include the following steps:

[0120] Whether the photovoltaic components corresponding to each inverter are covered with dust is determined according to the first power generation efficiency of each inverter in each preset time period in the photovoltaic power station.

[0121] It should be understood that if the photovoltaic components are covered with dust, the power generation efficiency of the corresponding inverter will be affected. Therefore, based on the power generation efficiency of the inverter, it can be determined whether the photovoltaic components corresponding to each inverter are covered with dust in each preset time period.

[0122] Generally speaking, the photovoltaic modules under the same inverter have similar geographical locations and climate environments, so the dust coverage of each photovoltaic module under the inverter is close to the same. Therefore, the dust coverage detection of the photovoltaic module can be based on the overall operation data of the inverter and the monitoring equipment to perform dust coverage judgment, that is, the power generation efficiency of the inverter can be calculated based on the above embodiment to determine whether the corresponding photovoltaic module is covered with dust.

[0123] For example, whether the corresponding photovoltaic component is covered with dust may be determined based on the power generation efficiency of different inverters in the same photovoltaic power station in the same time period.

[0124] Exemplarily, whether the photovoltaic module is covered with dust may also be determined based on the power generation efficiency of the same inverter in different time periods.

[0125] Therefore, when determining whether the photovoltaic modules are covered with dust, the power loss of the inverter can be further determined based on the power generation efficiency and mounting capacity of the inverter, and then a corresponding cleaning plan can be formulated to alleviate the power loss problem in a timely manner.

[0126] Taking the example of judging whether the corresponding photovoltaic components are covered with dust based on the power generation efficiency of different inverters in the same photovoltaic power station in the same time period, illustratively, the above “judging whether the photovoltaic components corresponding to each inverter are covered with dust based on the first power generation efficiency of each inverter in the photovoltaic power station in each preset time period” may include the following steps:

[0127] For the current inverter, compare the first power generation efficiency of the current inverter in a preset time period with the first power generation efficiency of other inverters in the photovoltaic power station in the preset time period, where the other inverters are inverters other than the current inverter;

[0128] When the first power generation efficiency of the current inverter is lower than the first power generation efficiency of other inverters, it is determined that the photovoltaic assembly under the current inverter is covered with dust within a preset time period.

[0129] For example, when determining whether the photovoltaic components under the current inverter are covered with dust, the first power generation efficiency of the current inverter in a preset time period can be compared with the first power generation efficiency of other inverters in the same photovoltaic power station except the current inverter in the same preset time period.

[0130] If the first power generation efficiency of the current inverter is lower than the first power generation efficiency of other inverters, it can be determined that the photovoltaic components under the current inverter are covered with dust in the preset time period.

[0131] If the first power generation efficiency of the current inverter is greater than or equal to the first power generation efficiency of other inverters, it can be determined that the photovoltaic components under the current inverter are not covered with dust during the preset time period.

[0132] By comparing the power generation efficiency of different inverters in the same photovoltaic power station during the same period, it is possible to determine whether the photovoltaic modules are covered with dust without the need to add additional equipment, thus reducing the cost of dust diagnosis.

[0133] Taking the determination of whether a photovoltaic module is covered with dust based on the power generation efficiency of the same inverter in different time periods as an example, illustratively, the above “determining whether a photovoltaic module corresponding to each inverter is covered with dust based on the first power generation efficiency of each inverter in the photovoltaic power station in each preset time period” may include the following steps:

[0134] For the current inverter, comparing the first power generation efficiency of the current inverter in a preset time period with the first power generation efficiency of the current inverter in a historical time period;

[0135] When the first power generation efficiency of the current inverter in the preset time period is less than the first power generation efficiency of the current inverter in the historical time period, it is determined that the photovoltaic components under the current inverter are covered with dust in the preset time period.

[0136] For example, for the same inverter, by comparing the power generation efficiency of the inverter in different time periods, it can be determined whether the photovoltaic components under the inverter are covered with dust.

[0137] For example, for the current inverter, if the power generation efficiency of the current inverter in a preset time period is less than the power generation efficiency of the current inverter in a historical time period, it can be determined that the photovoltaic components under the current inverter are covered with dust in the preset time period.

[0138] If the power generation efficiency of the current inverter in the preset time period is greater than or equal to the power generation efficiency of the current inverter in the historical time period, it can be determined that the photovoltaic components under the current inverter are not covered with dust in the preset time period.

[0139] By comparing the power generation efficiency of the same inverter at different times, it is possible to determine whether the PV panels are covered with dust without the need to add additional equipment, thus reducing the cost of dust diagnosis.

[0140] For example, when it is determined that the photovoltaic components under a certain inverter are covered with dust, an abnormal prompt message can be output to prompt the operation and maintenance personnel to recover the power loss and improve the safety of the equipment.

[0141] The embodiment of the present application does not limit the output method of the abnormal prompt information. For example, the abnormal prompt information can be output in the form of buzzer alarm, voice, text message, phone call, email, etc.

[0142] The embodiments of the present application can timely and effectively determine whether the photovoltaic components under the inverter are covered with dust by collecting the operating data of the inverter and the monitoring data of the monitoring equipment, thereby reducing hot spots, corrosion and the like caused by dust, and improving the operating life of the equipment. In addition, the embodiments of the present application do not require additional equipment, thereby reducing costs. At the same time, when determining whether the photovoltaic components are covered with dust, the loss of electricity can be further determined based on the dust loss rate of the inverter, thereby assisting operation and maintenance personnel in making effective cleaning decisions and facilitating refined operation and maintenance of the electric field.

[0143] Based on the same inventive concept, the embodiment of the present application also provides a device for determining power loss. Figure 4 The device for determining the power loss provided in the embodiment of the present application is described in detail.

[0144] Figure 4 A structural diagram of a device for determining power loss provided in an embodiment of the present application.

[0145] like Figure 4 As shown, the device for determining the power loss may include: an acquisition module 401 and a determination module 402;

[0146] An acquisition module 401 is used to acquire a first power generation efficiency of an inverter associated with a photovoltaic component in each preset time period within a first time period, and a mounting capacity of the inverter;

[0147] A determination module 402 is used to determine the dust loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period;

[0148] The determination module 402 is further used to determine the power loss of the inverter in each preset time period according to the dust loss rate and the mounting capacity of the inverter in each preset time period.

[0149] The embodiment of the present application obtains the first power generation efficiency of the inverter associated with the photovoltaic component in each preset time period within the first time length, and the mounting capacity of the inverter; determines the dust loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period; determines the power loss of the inverter in each preset time period according to the dust loss rate and mounting capacity of the inverter in each preset time period. That is, the embodiment of the present application can determine the power loss of the inverter in each time period based on the dust loss rate and mounting capacity of the inverter in each time period, which is helpful for the subsequent formulation of a cleaning plan for the photovoltaic component and reduces the power loss value.

[0150] In some embodiments, the determination module 402 is specifically configured to:

[0151] Determining a target power generation efficiency according to each first power generation efficiency of the inverter;

[0152] Determine the difference between the first power generation efficiency of the inverter in each preset time period and the target power generation efficiency;

[0153] The ratio of each difference to the target power generation efficiency is determined as the dust loss rate of the inverter in each preset time period.

[0154] In some embodiments, the acquisition module 401 is further used to acquire the second power generation efficiency of the inverter in each preset time period within the second time period, at least part of the time period of the second time period is the time period when the photovoltaic components are not covered with dust and is before the first time period;

[0155] The determination module 402 is specifically configured to:

[0156] Fitting the relationship between the power generation efficiency and the preset time period according to each second power generation efficiency and each first power generation efficiency;

[0157] When the relationship between the power generation efficiency and the preset time period begins to be negatively correlated, the corresponding power generation efficiency is determined as the target power generation efficiency.

[0158] In some embodiments, the determination module 402 is specifically configured to:

[0159] The product value of the dust loss rate of the inverter in each preset time period and the mounting capacity is determined as the power loss of the inverter in each preset time period.

[0160] In some embodiments, the device for determining the amount of power loss may further include:

[0161] A division module, used to divide each preset time period to obtain at least one time window;

[0162] The acquisition module 401 is also used to acquire the operation data of the inverter in each time window and the monitoring data of the monitoring equipment of the photovoltaic module in each time window, the operation data includes the power and power generation of the inverter, and the monitoring data includes the irradiation;

[0163] The determination module 402 is further configured to determine a first power generation efficiency of the inverter in each preset time period according to the power and power generation of the inverter in each time window and the irradiation in each time window.

[0164] In some embodiments, the determination module 402 is specifically configured to:

[0165] For each time window of the preset time period, determine the load rate of the inverter in the time window according to the power and mounting capacity of the inverter;

[0166] When the load rate is greater than a preset threshold, determining a second power generation efficiency of the inverter in the time window according to the power generation of the inverter in the time window and the irradiation in the time window;

[0167] An average value of the second power generation efficiency of the inverter in each time window is determined as the first power generation efficiency of the inverter in the preset time period.

[0168] In some embodiments, the monitoring data further includes monitoring the backplane temperature of the device;

[0169] The determination module 402 is specifically configured to:

[0170] The backplane temperature is corrected using the standard temperature to obtain a correction coefficient;

[0171] Determine the product of the mount capacity, radiation exposure and correction factor;

[0172] The ratio of the power generation amount to the product value is determined as the second power generation efficiency of the inverter in the time window.

[0173] In some embodiments, the device for determining the amount of power loss may further include:

[0174] A judgment module is used to judge whether the photovoltaic components corresponding to each inverter are covered with dust according to the first power generation efficiency of each inverter in the photovoltaic power station in each preset time period after the determination module 402 determines the first power generation efficiency of the inverter in each preset time period according to the power and power generation of the inverter in each time window and the irradiation in each time window.

[0175] In some embodiments, the determination module is specifically configured to:

[0176] For the current inverter, compare the first power generation efficiency of the current inverter in a preset time period with the first power generation efficiency of other inverters in the photovoltaic power station in the preset time period, where the other inverters are inverters other than the current inverter;

[0177] When the first power generation efficiency of the current inverter is lower than the first power generation efficiency of other inverters, it is determined that the photovoltaic assembly under the current inverter is covered with dust within a preset time period.

[0178] In some embodiments, the determination module is specifically configured to:

[0179] For the current inverter, comparing the first power generation efficiency of the current inverter in a preset time period with the first power generation efficiency of the current inverter in a historical time period;

[0180] When the first power generation efficiency of the current inverter in the preset time period is less than the first power generation efficiency of the current inverter in the historical time period, it is determined that the photovoltaic components under the current inverter are covered with dust in the preset time period.

[0181] The device for determining power loss provided in the embodiment of the present application can achieve Figure 1-2 To avoid repetition, the various processes in the embodiment of the method for determining the power loss shown are not described again here.

[0182] Based on the same inventive concept, the embodiment of the present application also provides an electronic device, which may be, for example, a tablet computer, a notebook computer, a handheld computer, etc. Figure 5 The electronic device provided in the embodiments of the present application is described in detail.

[0183] like Figure 5 As shown, the electronic device may include a processor 501 and a memory 502 for storing computer program instructions.

[0184] The processor 501 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0185] The memory 502 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 502 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In one example, the memory 502 may include a removable or non-removable (or fixed) medium, or the memory 502 is a non-volatile solid-state memory. In one example, the memory 502 may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0186] The processor 501 reads and executes the computer program instructions stored in the memory 502 to implement Figure 1-Figure 2 The method in the embodiment shown in the figure is achieved Figure 1-Figure 2 The corresponding technical effects achieved by executing the method in the illustrated embodiment are not described in detail here for the sake of brevity.

[0187] In one example, the electronic device may further include a communication interface 503 and a bus 504. Figure 5 As shown, the processor 501, the memory 502, and the communication interface 503 are connected via a bus 504 and communicate with each other.

[0188] The communication interface 503 is mainly used to implement communication between various modules, devices and / or equipment in the embodiments of the present application.

[0189] Bus 504 includes hardware, software or both, and each component of electronic device is coupled to each other.For example, but not limitation, bus 504 may include accelerated graphics port (Accelerated Graphics Port, AGP) or other graphics bus, enhanced industry standard architecture (Extended Industry Standard Architecture, EISA) bus, front side bus (Front Side Bus, FSB), hypertransmission (Hyper Transport, HT) interconnection, industry standard architecture (IndustryStandard Architecture, ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 504 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the application considers any suitable bus or interconnection.

[0190] The electronic device can execute the method for determining the power loss in the embodiment of the present application after obtaining the first power generation efficiency of the inverter associated with the photovoltaic assembly in each preset time period within the first time period and the mounting capacity of the inverter, thereby realizing the combination of Figure 1-2 The method for determining the amount of power lost described and Figure 4 A device for determining the amount of power lost is described.

[0191] In addition, in combination with the method for determining the power loss in the above embodiment, the embodiment of the present application can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the methods for determining the power loss in the above embodiment is implemented.

[0192] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0193] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or communication link by a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (Radio Frequency, RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0194] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0195] The above reference is according to the method of the present application embodiment, the flow chart of the device (system) and the computer program product and / or the block diagram of the present application embodiment. It should be understood that each square box in the flow chart and / or the block diagram and the combination of each square box in the flow chart and / or the block diagram can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the realization of the function / action specified in one or more square boxes of the flow chart and / or the block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each square box in the block diagram and / or the flow chart and the combination of the square boxes in the block diagram and / or the flow chart can also be realized by the dedicated hardware that performs the specified function or action, or can be realized by the combination of dedicated hardware and computer instructions.

[0196] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for determining power loss, characterized in that, it includes: Obtain the first power generation efficiency of an inverter associated with a photovoltaic module in each preset time period within a first time period, and the mounting capacity of the inverter; Determine the dust-covering loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period; Determine the power loss of the inverter in each preset time period according to the dust-covering loss rate of the inverter in each preset time period and the mounting capacity.

2. The method according to claim 1, characterized in that, The step of determining the dust-covering loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period includes: Determine the target power generation efficiency according to the first power generation efficiencies of the inverter; Determine the difference between the first power generation efficiency of the inverter in each preset time period and the target power generation efficiency; Determine the ratio of each difference to the target power generation efficiency as the dust-covering loss rate of the inverter in each preset time period.

3. The method according to claim 2, characterized in that, The method further includes: Obtain the second power generation efficiency of the inverter in each preset time period within a second time period, and at least part of the second time period is a time period before the first time period when the photovoltaic module is not covered with dust; The step of determining the target power generation efficiency according to the first power generation efficiencies of the inverter includes: Fit the relationship between the power generation efficiency and the preset time period according to each second power generation efficiency and each first power generation efficiency; When the relationship between the power generation efficiency and the preset time period starts to show a negative correlation, determine the corresponding power generation efficiency as the target power generation efficiency.

4. The method according to claim 1, characterized in that, The step of determining the power loss of the inverter in each preset time period according to the dust-covering loss rate of the inverter in each preset time period and the mounting capacity includes: Determine the product value of the dust-covering loss rate of the inverter in each preset time period and the mounting capacity as the power loss of the inverter in each preset time period.

5. The method according to claim 1, characterized in that, The method further includes: Divide each preset time period to obtain at least one time window; Obtain the operation data of the inverter in each time window and the monitoring data of the monitoring device of the photovoltaic module in each time window, where the operation data includes the power and power generation of the inverter, and the monitoring data includes the irradiance; Determine the first power generation efficiency of the inverter in each preset time period according to the power and power generation of the inverter in each time window and the irradiance in each time window.

6. The method according to claim 5, characterized in that, The step of determining the first power generation efficiency of the inverter in each preset time period according to the power and power generation of the inverter in each time window and the irradiance in each time window includes: For each time window of the preset time period, determine the load factor of the inverter in the time window according to the power of the inverter and the mounting capacity; When the load factor is greater than a preset threshold, determine the second power generation efficiency of the inverter in the time window according to the power generation amount of the inverter in the time window and the irradiance amount of the time window; Determine the average value of the second power generation efficiency of the inverter in each time window as the first power generation efficiency of the inverter in the preset time period.

7. The method according to claim 6, wherein, the monitoring data further includes the backplane temperature of the monitoring device; The determining the second power generation efficiency of the inverter in the time window according to the power generation amount of the inverter in the time window and the irradiance amount of the time window includes: correct the backplane temperature using the standard temperature to obtain a correction coefficient; determine the product value of the mounting capacity, the irradiance amount and the correction coefficient; determine the ratio of the power generation amount to the product value as the second power generation efficiency of the inverter in the time window.

8. The method according to claim 5, wherein, after determining the first power generation efficiency of the inverter in each preset time period according to the power and power generation amount of the inverter in each time window and the irradiance amount of each time window, the method further includes: judge whether the photovoltaic modules corresponding to each inverter are covered with dust according to the first power generation efficiency of each inverter in the photovoltaic power station in each preset time period.

9. The method according to claim 8, wherein, the judging whether the photovoltaic modules corresponding to each inverter are covered with dust according to the first power generation efficiency of each inverter in the photovoltaic power station in each preset time period includes: for the current inverter, compare the first power generation efficiency of the current inverter in the preset time period with the first power generation efficiency of other inverters in the photovoltaic power station in the preset time period, and the other inverters are the inverters other than the current inverter among all the inverters; when the first power generation efficiency of the current inverter is less than the first power generation efficiency of the other inverters, determine that the photovoltaic modules under the current inverter are covered with dust in the preset time period.

10. The method according to claim 8, wherein, the judging whether the photovoltaic modules corresponding to each inverter are covered with dust according to the first power generation efficiency of each inverter in the photovoltaic power station in each preset time period includes: for the current inverter, compare the first power generation efficiency of the current inverter in the preset time period with the first power generation efficiency of the current inverter in the historical time period; when the first power generation efficiency of the current inverter in the preset time period is less than the first power generation efficiency of the current inverter in the historical time period, determine that the photovoltaic modules under the current inverter are covered with dust in the preset time period.

11. A device for determining lost power, wherein, comprises: an acquisition module and a determination module; The obtaining module is configured to obtain the first power generation efficiency of an inverter associated with a photovoltaic module in each preset time period within a first time period, and the mounting capacity of the inverter; The determining module is configured to determine the dust-covering loss rate of the inverter in each preset time period according to the first power generation efficiency of the inverter in each preset time period; The determining module is further configured to determine the lost power of the inverter in each preset time period according to the dust-covering loss rate of the inverter in each preset time period and the mounting capacity; 12. An electronic device, characterized in that, it includes: a processor; a memory for storing computer program instructions; When the computer program instructions are executed by the processor, the method according to any one of claims 1-10 is implemented.

13. A computer-readable storage medium, on which computer program instructions are stored, characterized in that, When the computer program instructions are executed by a processor, the method according to any one of claims 1-10 is implemented.

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