An operation state monitoring system of a solar photovoltaic power station

Abstract

The application discloses a kind of solar photovoltaic power station's operating state monitoring system, including photovoltaic power station operation monitoring platform, photovoltaic resource acquisition module, photovoltaic equipment operation tracking module, photovoltaic power generation evaluation module, regional positioning tracking investigation module and early warning module;The application is in the process of photovoltaic power station operation, the output power generation value is comprehensively monitored and analyzed from many aspects in combination with the operation data of photovoltaic equipment and the environmental data where power station is located, according to the comparison between actual output electric energy of photovoltaic panel and photovoltaic panel output power generation value, the operation performance of photovoltaic panel is evaluated and judged, the monitoring area where the photovoltaic panel in low-efficiency operation state is judged is divided into operation low-efficiency area, and the operation performance of photovoltaic panel in operation low-efficiency area is judged, the detection range of photovoltaic module is gradually reduced from wide to small, and unqualified photovoltaic module is easily found, the stability of photovoltaic power generation is improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power plant technology, and more specifically, to an operational status monitoring system for a solar photovoltaic power plant. Background Technology

[0002] With the development of technology and increasing demand, solar photovoltaic power generation is gradually replacing some conventional energy sources and will become the mainstay of the world's energy supply. As a result, the demand for intelligent operation and maintenance systems for photovoltaic power plants will become increasingly high.

[0003] The operation mode of a photovoltaic power station is that, under the condition of solar radiation, the solar photovoltaic cell array of the photovoltaic power generation system converts solar energy into electrical energy, which is then sent to the DC distribution cabinet through the DC combiner box. The grid-connected inverter then converts the electrical energy into AC power to supply the building's own load. The power generation efficiency of a photovoltaic power station mainly depends on the power generation efficiency of the photovoltaic panels in relation to the natural environment.

[0004] Traditional solar photovoltaic power plant operation monitoring systems only monitor the power plant's output power and meteorological environment. They cannot monitor the photovoltaic panels' own operating status and power generation efficiency. It is difficult to judge the real-time operating status of photovoltaic modules based on the actual power output, which makes it impossible to eliminate unqualified modules from among the many photovoltaic panels, thus leading to reduced stability and low efficiency of photovoltaic power generation.

[0005] To address these practical problems, we propose an operational status monitoring system for solar photovoltaic power plants. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that existing technologies rarely monitor the operating status and power generation efficiency of photovoltaic panels, making it difficult to judge the real-time operating status of photovoltaic modules based on actual power output, thus making it impossible to eliminate unqualified modules among many photovoltaic panels. Compared with existing technologies, this invention provides an operating status monitoring system for solar photovoltaic power plants.

[0007] The objective of this invention can be achieved through the following technical solution: a solar photovoltaic power station operation status monitoring system, comprising a photovoltaic power station operation monitoring platform, a photovoltaic resource acquisition module, a photovoltaic equipment operation tracking module, a photovoltaic power generation assessment module, a regional positioning tracking and investigation module, and an early warning module;

[0008] The photovoltaic power station operation monitoring platform divides the total area of ​​photovoltaic panels in the solar photovoltaic power station into I monitoring areas, sets a monitoring cycle of T days, and sets t monitoring periods within a single day;

[0009] The photovoltaic resource acquisition module is used to acquire environmental data of the photovoltaic power station during the monitoring period, generate the average positive conversion value of light source through the environmental data, and send it to the photovoltaic power generation assessment module.

[0010] The photovoltaic equipment operation tracking module is used to acquire photovoltaic panel operation data, which includes photovoltaic panel temperature value, photovoltaic panel voltage output value, and actual output power of photovoltaic panel. The photovoltaic panel temperature value and photovoltaic panel voltage output value are processed to obtain the reverse influence value of photovoltaic panel, and then sent to the photovoltaic power generation evaluation module along with the actual output power of photovoltaic panel.

[0011] After receiving the average forward conversion value of the light source and the reverse influence value of the photovoltaic power generation panel, the photovoltaic power generation assessment module calculates and generates the output power generation value of the photovoltaic power generation panel. It compares the actual output power of the photovoltaic power generation panel with the output power generation value of the photovoltaic power generation panel to evaluate and judge the operating performance of the photovoltaic power generation panel. Based on the assessment results, it generates high-efficiency operation signal and low-efficiency operation signal, and marks the monitoring area where the low-efficiency operation signal is generated as the low-efficiency operation area. The low-efficiency operation area number is sent to the area positioning tracking and investigation module.

[0012] The regional positioning and tracking module is used to locate multiple photovoltaic panels in an inefficient operating area and determine the operating performance of each individual photovoltaic panel, and then send the determination results to the early warning module.

[0013] As a preferred embodiment of the present invention, the process of obtaining the average positive conversion value of the light source includes: collecting environmental data for a single day within the monitoring period, including the average ambient temperature, the average light intensity, and the total sunshine duration; labeling the average ambient temperature, the average light intensity, and the total sunshine duration as HW, GQ, and GT, respectively; and calculating the average positive conversion value of the light source GZX using the formula: GZX = [(α+1)HW + (β+1)GQ] × GT, where α and β represent the positive proportionality coefficients of the average ambient temperature and the average light intensity, respectively, and 0 < α < β.

[0014] As a preferred embodiment of the present invention, the process of calculating and processing the photovoltaic panel temperature value and the photovoltaic panel voltage output value includes: obtaining the photovoltaic panel temperature value Wt for a single day within the monitoring period, summing the multiple photovoltaic panel temperature values ​​within the monitoring period and taking the average value to obtain the average photovoltaic panel temperature value, which is marked as WJ;

[0015] The system obtains the photovoltaic panel voltage output value Vt for a single day within the monitoring period, calculates the difference between the photovoltaic panel voltage output values ​​in two consecutive monitoring periods to obtain the voltage output fluctuation value, compares the voltage output fluctuation value with the preset voltage output fluctuation threshold, and marks the sum of all voltage output fluctuation values ​​that are greater than the preset voltage output fluctuation threshold as the voltage output abnormal fluctuation value, which is marked as VB.

[0016] The reverse influence value BNX of the photovoltaic panel is calculated based on the average temperature of the photovoltaic panel and the abnormal voltage output fluctuation value. BNX = (a1+1)WJ + (a2+1)VB, a1>a2>0, where a1 and a2 are the proportional coefficients of the average temperature of the photovoltaic panel WJ and the abnormal voltage output fluctuation value VB, respectively.

[0017] In a preferred embodiment of the present invention, the process of evaluating the operating performance of the photovoltaic panel during the monitoring period includes: obtaining the average forward conversion value GZX of the light source and the reverse influence value BNX of the photovoltaic panel, performing formula calculations to obtain the output power generation value FDL of the photovoltaic panel. γ is the error correction factor, which is the sum of the output power of all photovoltaic panels during the monitoring period to obtain the total output power of the photovoltaic panels.

[0018] In a preferred embodiment of the present invention, the ratio between the actual output power of the photovoltaic panel and the total output power of the photovoltaic panel is marked as the photovoltaic panel conversion rate. The photovoltaic panel conversion rate is compared with a preset photovoltaic panel conversion rate threshold. When the photovoltaic panel conversion rate is greater than or equal to the preset photovoltaic panel conversion rate threshold, the photovoltaic panel in the monitoring area is determined to be in a high-efficiency operating state, and a high-efficiency operating signal is generated. When the photovoltaic panel conversion rate is less than the preset photovoltaic panel conversion rate threshold, the photovoltaic panel in the monitoring area is determined to be in an inefficient operating state, and an inefficient operating signal is generated.

[0019] As a preferred embodiment of the present invention, the process of judging the operating performance of a single photovoltaic power generation panel in an inefficient operating area includes: obtaining the average forward conversion value of multiple light sources and the output power generation value of the photovoltaic power generation panel within T days; forming a set A from the average forward conversion value of the light sources in ascending order; establishing a rectangular coordinate system with the values ​​in set A as the x-axis and the output power generation value of the photovoltaic power generation panel corresponding to the average forward conversion value of the light sources as the y-axis; and plotting the change curve of the output power generation value of the photovoltaic power generation panel at multiple collection points on the rectangular coordinate system by plotting points.

[0020] In a preferred embodiment of the present invention, when the output power generation curve of the photovoltaic power generation panel shows a positive upward trend, it is determined that the operation performance of the photovoltaic power generation panel meets the standard and it is marked as a qualified photovoltaic module. When the output power generation curve of the photovoltaic power generation panel does not show a positive upward trend, it is determined that the operation performance of the photovoltaic power generation panel does not meet the standard, it is marked as a non-qualified photovoltaic module, and an early warning signal is generated.

[0021] Compared with the prior art, the advantages of this invention are:

[0022] (1) This scheme combines the operating data of photovoltaic equipment and the environmental data of the power station during the operation of the solar photovoltaic power station to conduct comprehensive monitoring and analysis of the output power generation value. The actual output power of the photovoltaic panel is compared with the output power generation value of the photovoltaic panel to evaluate and judge the operating performance of the photovoltaic panel. The monitoring area of ​​the photovoltaic panel that is determined to be in an inefficient operating state is divided into an inefficient operating area. Then, multiple photovoltaic panels in the inefficient operating area are individually located and the operating performance of each individual photovoltaic panel is judged. In this way, the real-time operating status of the photovoltaic module can be judged based on the actual output of power generation. The monitoring range of the photovoltaic module is gradually narrowed from broad to small, making it easier to find unqualified photovoltaic modules and improve the stability of photovoltaic power generation.

[0023] (2) After identifying the inefficient operating area, this scheme uses the area positioning tracking and investigation module to locate multiple photovoltaic panels in the inefficient operating area and obtains the average positive conversion value of multiple light sources and the output power value of the photovoltaic panel during the monitoring period. The average positive conversion value of the light sources is arranged into a set A from small to large. The values ​​in set A are used as the x-axis, and the output power value of the photovoltaic panel corresponding to the average positive conversion value of the light source is used as the y-axis to establish a rectangular coordinate system. The output power value change curve of the photovoltaic panel at multiple collection points is plotted on the rectangular coordinate system by plotting points. The performance of the photovoltaic panel is judged according to the growth pattern of the output power value change curve.

[0024] If the output power value of a photovoltaic panel shows a positive upward trend, the photovoltaic panel is judged to meet the standard and is marked as a qualified photovoltaic module; otherwise, it is marked as an unqualified photovoltaic module. Attached Figure Description

[0025] Figure 1 This is a system block diagram from Embodiment 1 of the present invention;

[0026] Figure 2 This is a system block diagram in Embodiment 2 of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1: This invention discloses an operation status monitoring system for a solar photovoltaic power station. Please refer to [link / reference]. Figure 1 It includes a photovoltaic power station operation monitoring platform and a photovoltaic resource acquisition module, a photovoltaic equipment operation tracking module, a photovoltaic power generation assessment module, a regional positioning tracking and investigation module, and an early warning module that are connected to the photovoltaic power station operation monitoring platform. The photovoltaic power station operation monitoring platform divides the total installation area of ​​photovoltaic panels in the solar photovoltaic power station into I monitoring areas, sets a monitoring cycle of T days, and sets t monitoring periods within a single day. I, T, and t are all positive integers greater than 1.

[0029] The photovoltaic resource acquisition module is used to acquire environmental data of the photovoltaic power station during the monitoring period. The environmental data includes the average ambient temperature, average light intensity, and total sunshine duration. The average ambient temperature, average light intensity, and total sunshine duration are labeled as HW, GQ, and GT, respectively. The average positive conversion value of the light source, GZX, is calculated by the formula: GZX = [(α+1)HW + (β+1)GQ] × GT, where α and β represent the positive proportionality coefficients of the average ambient temperature and average light intensity, respectively, and 0 < α < β. The average positive conversion value of the light source, GZX, is sent to the photovoltaic power generation assessment module. Temperature, light intensity, and sunshine duration are all positive influencing factors on the power conversion output value of the photovoltaic power generation panel.

[0030] The photovoltaic equipment operation tracking module is used to acquire photovoltaic panel operation data, which includes photovoltaic panel temperature value, photovoltaic panel voltage output value, and actual output power of photovoltaic panel.

[0031] The photovoltaic panel temperature value and photovoltaic panel voltage output value are processed to obtain the reverse influence value of the photovoltaic panel. The process includes: obtaining the photovoltaic panel temperature value Wt for a single day within the monitoring period, summing the multiple photovoltaic panel temperature values ​​within the monitoring period and taking the average value to obtain the average photovoltaic panel temperature value, which is marked as WJ.

[0032] The system obtains the daily photovoltaic panel voltage output value Vt within the monitoring period, calculates the difference between the photovoltaic panel voltage output values ​​in two consecutive monitoring periods to obtain the voltage output fluctuation value, compares the voltage output fluctuation value with the preset voltage output fluctuation threshold, and marks the sum of all voltage output fluctuation values ​​that are greater than the preset voltage output fluctuation threshold as the voltage output abnormal fluctuation value, which is marked as VB.

[0033] The reverse influence value BNX of the photovoltaic panel is calculated based on the average temperature of the photovoltaic panel and the abnormal voltage output fluctuation value. BNX = (a1+1)WJ + (a2+1)VB, a1>a2>0, where a1 and a2 are the proportional coefficients of the average temperature of the photovoltaic panel WJ and the abnormal voltage output fluctuation value VB, respectively. Both the average temperature of the photovoltaic panel and the abnormal voltage output fluctuation value are reverse influence factors on the output value of the photovoltaic panel's power generation conversion.

[0034] The photovoltaic equipment operation tracking module sends the reverse impact value BNX of the photovoltaic panel and the actual output power of the photovoltaic panel to the photovoltaic power generation assessment module.

[0035] After receiving the average forward conversion value GZX from the light source and the reverse influence value BNX from the photovoltaic panel, the photovoltaic power generation assessment module performs calculations to obtain the output power generation value FDL of the photovoltaic panel. γ is the error correction factor. The total output power of the photovoltaic panels is obtained by summing the output power of all photovoltaic panels within the monitoring period. The larger the average value of the positive conversion of the light source, GZX, the higher the output power of the photovoltaic panel, FDL. The larger the value of the negative influence of the photovoltaic panel, BNX, the smaller the output power of the photovoltaic panel, indicating that under good light intensity, abnormal temperature rise or voltage fluctuation of the photovoltaic panel will affect the output power of the photovoltaic panel.

[0036] The ratio between the actual output power of the photovoltaic panel and the total output power of the photovoltaic panel is marked as the photovoltaic panel conversion rate. The photovoltaic panel conversion rate is compared with the preset photovoltaic panel conversion rate threshold. When the photovoltaic panel conversion rate is greater than or equal to the preset photovoltaic panel conversion rate threshold, it is determined that the photovoltaic panel in the monitoring area is in a high-efficiency operating state, and a high-efficiency operating signal is generated.

[0037] When the conversion rate of a photovoltaic panel is less than the preset conversion rate threshold, the photovoltaic panels in the monitoring area are determined to be in an inefficient operating state, and an inefficient operating signal is generated. The actual output power of the photovoltaic panel is compared with the output power value of the photovoltaic panel to evaluate and determine the operating performance of the photovoltaic panel. The monitoring area where the photovoltaic panel determined to be in an inefficient operating state is located is divided into an inefficient operating area, and the inefficient operating area number is sent to the area positioning and tracking module to narrow down the subsequent positioning and investigation scope.

[0038] Example 2: Based on Example 1, this example uses a regional positioning tracking and investigation module to monitor the operating status of multiple photovoltaic panels in an inefficient operating area one by one.

[0039] Please see Figure 2 The regional positioning and tracking module is used to locate multiple photovoltaic panels within an inefficient operating area and determine the operational performance of each individual photovoltaic panel, as detailed below:

[0040] The average forward conversion value of a single photovoltaic panel over a period of T days and the output power value of the photovoltaic panel are obtained. The average forward conversion values ​​of the light sources are arranged into a set A from smallest to largest. The values ​​in set A are used as the x-axis, and a rectangular coordinate system is established with the output power value of the photovoltaic panel corresponding to the average forward conversion value of the light source as the y-axis. The output power value variation curves of the photovoltaic panel at multiple collection points are plotted on the rectangular coordinate system by plotting points.

[0041] When the output power value of a photovoltaic panel shows a positive upward trend, it is determined that the operation performance of the photovoltaic panel meets the standard and it is marked as a qualified photovoltaic module. This indicates that the larger the average positive conversion value of the light source, the higher the output power value of the photovoltaic panel shows a gradual upward trend. The negative influence value BNX of the photovoltaic panel has a much smaller impact on the growth of the output power value of the photovoltaic panel than the average positive conversion value of the light source.

[0042] If the output power value of a photovoltaic panel does not show a positive upward trend, it is determined that the operating performance of the photovoltaic panel does not meet the standard and it is marked as a substandard photovoltaic module.

[0043] This indicates that the larger the average forward conversion value of the light source, the lower the output power of the photovoltaic panel. In fact, the larger the average forward conversion value of the light source, the lower the output power of the photovoltaic panel. The reverse influence value BNX of the photovoltaic panel has a much greater impact on the growth of the output power of the photovoltaic panel than the average forward conversion value of the light source. This indicates that the average temperature or voltage output of the photovoltaic panel is abnormal. The larger the average forward conversion value of the light source, the larger the average temperature of the photovoltaic panel, indicating poor heat dissipation performance. Abnormal voltage output fluctuation is one of the limiting factors of the output power of the photovoltaic panel. When the heat dissipation performance of the photovoltaic panel is poor and it is in a high-temperature state, it is easy to cause fluctuations in the operating voltage of the photovoltaic panel.

[0044] When the photovoltaic panel's performance is deemed to be non-compliant with standards, an early warning signal is generated and sent to the early warning module. The early warning module then sends the signal to the management personnel's terminal via text alert. Upon receiving the corresponding early warning, the management personnel promptly inspect and repair the marked solar photovoltaic modules to ensure their safe, stable, and efficient operation and extend their service life.

[0045] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0046] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A monitoring system for the operational status of a solar photovoltaic power station, characterized in that: It includes a photovoltaic power plant operation monitoring platform, a photovoltaic resource acquisition module, a photovoltaic equipment operation tracking module, a photovoltaic power generation assessment module, a regional positioning tracking and investigation module, and an early warning module; The photovoltaic power station operation monitoring platform divides the total area of ​​photovoltaic panels in the solar photovoltaic power station into I monitoring areas, sets a monitoring cycle of T days, and sets t monitoring periods within a single day; The photovoltaic resource acquisition module is used to acquire environmental data of the photovoltaic power station during the monitoring period, generate the average positive conversion value of light source through the environmental data, and send it to the photovoltaic power generation assessment module. The photovoltaic equipment operation tracking module is used to acquire photovoltaic panel operation data, which includes photovoltaic panel temperature value, photovoltaic panel voltage output value, and actual output power of photovoltaic panel. The photovoltaic panel temperature value and photovoltaic panel voltage output value are processed to obtain the reverse influence value of photovoltaic panel, and then sent to the photovoltaic power generation evaluation module along with the actual output power of photovoltaic panel. After receiving the average forward conversion value of the light source and the reverse influence value of the photovoltaic power generation panel, the photovoltaic power generation assessment module calculates and generates the output power generation value of the photovoltaic power generation panel. It compares the actual output power of the photovoltaic power generation panel with the output power generation value of the photovoltaic power generation panel to evaluate and judge the operating performance of the photovoltaic power generation panel. Based on the assessment results, it generates high-efficiency operation signal and low-efficiency operation signal, and marks the monitoring area where the low-efficiency operation signal is generated as the low-efficiency operation area. The low-efficiency operation area number is sent to the area positioning tracking and investigation module. The process of obtaining the average positive conversion value of the light source includes: collecting environmental data for a single day during the monitoring period, including the average ambient temperature, the average light intensity, and the total sunshine duration; labeling the average ambient temperature, the average light intensity, and the total sunshine duration as HW, GQ, and GT, respectively; and calculating the average positive conversion value of the light source GZX using a formula. The process of calculating and processing the photovoltaic panel temperature value and photovoltaic panel voltage output value includes: obtaining the photovoltaic panel temperature value Wt for a single day within the monitoring period, summing and averaging multiple photovoltaic panel temperature values ​​within the monitoring period to obtain the average photovoltaic panel temperature value, which is marked as WJ; The system obtains the photovoltaic panel voltage output value Vt for a single day within the monitoring period, calculates the difference between the photovoltaic panel voltage output values ​​in two consecutive monitoring periods to obtain the voltage output fluctuation value, compares the voltage output fluctuation value with the preset voltage output fluctuation threshold, and marks the sum of all voltage output fluctuation values ​​that are greater than the preset voltage output fluctuation threshold as the voltage output abnormal fluctuation value, which is marked as VB. The reverse influence value BNX of the photovoltaic panel is calculated based on the average temperature of the photovoltaic panel and the abnormal fluctuation value of the voltage output. The process of evaluating the operating performance of photovoltaic panels during the monitoring period includes: obtaining the average forward conversion value GZX and the reverse influence value BNX of the photovoltaic panel, and calculating the output power generation value FDL of the photovoltaic panel using a formula. γ is the error correction factor. The total output power of the photovoltaic panels is obtained by summing the output power of all photovoltaic panels within the monitoring period. The larger the average value of the positive conversion of the light source, GZX, the higher the output power of the photovoltaic panel, FDL. The larger the value of the negative influence of the photovoltaic panel, BNX, the smaller the output power of the photovoltaic panel, indicating that under good light intensity, abnormal temperature rise or voltage fluctuation of the photovoltaic panel will affect the output power of the photovoltaic panel. The regional positioning and tracking module is used to locate multiple photovoltaic panels in an inefficient operating area and determine the operating performance of each individual photovoltaic panel, and then send the determination results to the early warning module.

2. The solar photovoltaic power station operation status monitoring system according to claim 1, characterized in that: The ratio between the actual output power of the photovoltaic panel and the total output power of the photovoltaic panel is marked as the photovoltaic panel conversion rate. The photovoltaic panel conversion rate is compared with a preset photovoltaic panel conversion rate threshold. When the photovoltaic panel conversion rate is greater than or equal to the preset photovoltaic panel conversion rate threshold, the photovoltaic panels in the monitoring area are determined to be in a high-efficiency operating state, and a high-efficiency operating signal is generated. When the photovoltaic panel conversion rate is less than the preset photovoltaic panel conversion rate threshold, the photovoltaic panels in the monitoring area are determined to be in an inefficient operating state, and an inefficient operating signal is generated.

3. The solar photovoltaic power station operation status monitoring system according to claim 2, characterized in that: The process of judging the operating performance of a single photovoltaic panel in an inefficient operating area includes: obtaining the average forward conversion value of multiple light sources and the output power value of the photovoltaic panel within T days; forming a set A from the average forward conversion values ​​of the light sources in ascending order; establishing a rectangular coordinate system with the values ​​in set A as the x-axis and the output power value of the photovoltaic panel corresponding to the average forward conversion value of the light source as the y-axis; plotting the output power value change curves of the photovoltaic panel at multiple collection points on the rectangular coordinate system by plotting points; and judging the photovoltaic panel based on the growth pattern of the output power value change curves.

4. The solar photovoltaic power station operation status monitoring system according to claim 3, characterized in that: If the output power generation curve of a photovoltaic panel shows a positive upward trend, the photovoltaic panel is judged to meet the standard and is marked as a qualified photovoltaic module. If the output power generation curve of a photovoltaic panel does not show a positive upward trend, the photovoltaic panel is judged to not meet the standard and is marked as a non-qualified photovoltaic module, and an early warning signal is generated.

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