Photovoltaic power generation system

Abstract

The invention provides a photovoltaic power generation system, and relates to the technical field of photovoltaic power generation, the photovoltaic power generation system comprises a photovoltaic power generation assembly, the photovoltaic power generation assembly is electrically connected with a transformer through a control module, the transformer is electrically connected with a power grid, the transformer comprises a shell, a plurality of groups of transformer bodies are arranged in the shell, and a plurality of spraying nozzles are arranged at the top of the shell. The spraying nozzles are connected with the pump machine through a plurality of conveying pipes, a plurality of recycling pipes are arranged below the shell and connected with a plurality of scattered recycling boxes respectively, the scattered recycling boxes are connected with a main recycling box, discharging pipes are arranged in the scattered recycling boxes, and a control module is arranged on the transformer. A property monitoring module is arranged in the dispersing and recycling box, the control module is in communication connection with the property monitoring module, and flow sensors are arranged on the conveying pipes and the recycling pipes. The technical problems that a transformer cooling medium is low in heat exchange efficiency and the cooling medium cannot be dynamically adjusted are solved.

Description

Technical Field

[0001] The invention belongs to the field of photovoltaic power generation, and in particular relates to a photovoltaic power generation system. Background Art

[0002] Photovoltaic power generation is to convert the direct current generated by many photovoltaic panels into a whole, and then transmit it to the transformer and merge it into the power grid. During the operation of the transformer, the winding and the core will generate resistance heat and electromagnetic eddy current heat, so the transformer needs to be cooled to ensure the normal operation of the transformer and extend its service life. Photovoltaic power generation is large in scale and has a high power generation current, so a large transformer is used to connect to the power grid; Existing large transformers are usually cooled by various methods such as oil-immersed air cooling, forced oil circulation air cooling, and forced oil circulation water cooling. All of the above cooling methods use immersion cooling, and the heat exchange efficiency between the transformer and the cooling medium is low. The adjustment ability of the cooling medium is weak, and the cooling medium cannot be dynamically adjusted according to the heating conditions of the transformer. The cooling medium is redundant, and immersion cooling is prone to impurity precipitation. Summary of the invention

[0003] The present invention provides a photovoltaic power generation system to solve at least one technical problem raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention discloses a photovoltaic power generation system, including: a photovoltaic power generation component, the photovoltaic power generation component is electrically connected to a transformer through a control module, the transformer is electrically connected to a power grid, the transformer includes a shell, a plurality of transformer bodies are arranged in the shell, a plurality of spray nozzles are arranged on the top of the shell, the plurality of spray nozzles are connected to a pump through a plurality of conveying pipes, a plurality of recovery pipes are arranged under the shell, the plurality of recovery pipes are respectively connected to a plurality of dispersed recovery boxes, the plurality of dispersed recovery boxes are connected to a total recovery box, a plurality of dispersed recovery boxes are provided with a discharge pipe, a control module is arranged on the transformer, the control module is used to regulate and distribute the cooling medium in the plurality of conveying pipes, a property monitoring module is arranged in the dispersed recovery box, for monitoring the property changes of the circulating cooling medium, the control module and the property monitoring module are communicated and connected, and flow sensors are arranged on the plurality of conveying pipes and the plurality of recovery pipes.

[0005] Preferably, the control module includes A cooling medium regulating unit, used to calculate and regulate the cooling medium delivery amount in each delivery pipe; A flow monitoring unit is used to monitor the flow data of the cooling medium in each delivery pipe and recovery pipe. When the delivery flow data of the cooling medium in the delivery pipe and the recovery flow data of the cooling medium in the recovery pipe are lower than the expected threshold value, an alarm is issued and a filling operation is performed; The status monitoring unit is used to evaluate and judge the working status of the transformer according to the working status of the flow monitoring unit.

[0006] Preferably, the cooling medium conditioning unit comprises: Transformer heating condition monitoring module, used to obtain the heating conditions of several groups of transformer bodies; The adjustment delivery volume calculation module is used to calculate the delivery volume of the cooling medium in each delivery pipe; = (1); among which, is the cooling medium delivery volume in the i-th delivery pipe, is the specific heat capacity of the transformer body, is the heat equivalent mass of the transformer body, is the heating temperature of the transformer body, is the operating temperature of the transformer body, is the specific heat capacity of the cooling medium, is the inlet temperature of the cooling medium recovery pipe, is the outlet temperature of the cooling medium delivery pipe, is the spray density, is the transformer body coefficient without spraying, Diameter of the spray outlet.

[0007] Preferably, the status monitoring unit comprises: A statistical module is used to obtain the flow rate and passing time of each cooling medium passing through each delivery pipe flow rate, the flow rate and passing time of each cooling medium passing through each recovery pipe flow rate, and the time point of each cooling medium passing through each delivery pipe flow rate and each recovery pipe flow rate during the working hours of the day, and to draw a capacity trend curve graph of the delivery pipe flow rate and a capacity trend curve graph of the recovery pipe flow rate respectively by taking the time point as the horizontal coordinate and multiplying the flow rate and passing time data of each delivery pipe flow rate and recovery pipe flow rate during the day; A buffer recording module is used to record the flow rate and passing time of each cooling medium passing through each delivery pipe during the working hours of each day in the previous week of the transformer, record the flow rate and passing time of each cooling medium passing through each recovery pipe during the working hours of each day in the previous week of the transformer, record the time point of each cooling medium passing through each delivery pipe and each recovery pipe during the working hours of each day in the previous week of the transformer, and use the time point data as the horizontal coordinate and the product of the flow rate and passing time data of each delivery pipe within a week as the vertical coordinate to establish a cooling medium transportation capacity trend curve chart, which is used as a temporary transportation benchmark reference value, and use the time point data as the horizontal coordinate and the product of the flow rate and passing time data of each recovery pipe within a week as the vertical coordinate to establish a cooling medium recovery capacity trend curve chart, which is used as a temporary recovery benchmark reference value; For the comparison module, if the trend curve of the delivery capacity of each delivery pipe during the working hours of the day is compared with the temporary delivery benchmark reference value, and the trend curve of the recovery capacity of each recovery pipe during the working hours of the day is compared with the temporary recovery benchmark reference value, and the trend curve of the two shows a deviation beyond the fluctuation benchmark value, an alarm will be issued when any of the above two situations occurs.

[0008] Preferably, the property monitoring module includes: A density detection unit, arranged in a plurality of dispersed recovery boxes, is used to detect the density of the cooling medium; A transparency detection unit, arranged in a plurality of dispersed recovery boxes, is used to detect the transparency of the cooling medium; pH detection units, arranged in a plurality of dispersed recovery boxes, are used to detect the pH of the cooling medium; A property evaluation unit, used to evaluate the properties of the cooling medium at a certain frequency based on the detection results of the density detection module, the transparency detection module and the pH detection module, and obtain the evaluation results of the cooling medium; The alarm discharge unit is used to intercept the decentralized recovery box and discharge the cooling medium through the discharge pipe when the cooling medium property evaluation result of a decentralized recovery box among several decentralized recovery boxes does not meet the cooling standard of the transformer, and at the same time alarm to remind the staff.

[0009] Preferably, the transparency detection unit comprises: Directional spotlights, which are arranged in the dispersed recovery box, are used to penetrate the cooling medium with a directional light source of a certain light intensity; A light receiving element, which is arranged in the dispersion recovery box and is used to receive the directional light source penetrating the cooling medium and detect the light intensity; The transparency evaluation module is used to calculate the transparency parameters of the cooling medium based on a directional spotlight and a light receiving element.

[0010] Preferably, the transparency assessment module includes: The area division subsystem is used to divide the cooling medium in the decentralized recovery box into different areas; A comprehensive calculation subsystem is used to calculate the regional transparency of the cooling medium in each area according to the light intensity of the directional spotlight and the light intensity of the light receiving element, and the overall transparency of the cooling medium in the decentralized recovery box is obtained by arithmetic averaging the regional transparency; = (2); in which: is the transparency of the cooling medium of the ath decentralized recovery box, is the transparency conversion coefficient, is the light intensity of the jth region, is the refractive index of the cooling medium, The refractive index of air, is the refractive loss rate of the light receiving element, The number of divided areas.

[0011] Preferably, the property evaluation unit comprises: An evaluation calculation module, used for calculating the property state parameters of the cooling medium based on the density detection unit, the transparency detection unit and the pH detection unit; The result comparison module is used to determine the property evaluation result of the cooling medium based on the property evaluation parameter of the cooling medium. When the property evaluation parameter of the cooling medium is lower than the minimum standard property parameter of the cooling medium, it is determined that the cooling medium has deteriorated and the cooling medium cannot be used anymore. When the property evaluation parameter of the cooling medium is lower than the minimum standard property parameter of the cooling medium, it is determined that the cooling medium can still be used.

[0012] Preferably, the evaluation calculation module calculates the property evaluation parameter of the cooling medium based on the following formula: = (3); = (4); in which: Evaluate parameters for the properties of the cooling medium, is the recycling coefficient of cooling medium, is the detection value of the cooling medium by the density detection unit, To disperse the volume of the cooling medium in the recovery tank, is the surface pressure of the cooling medium, The cumulative usage time of the cooling medium. is the cooling area of ​​the transformer body, is the surface evaporation thickness of the cooling medium, is the volatility coefficient of the cooling medium, is the pollution coefficient of the reuse of cooling medium, For the transparency of the cooling medium, is the initial transparency of the cooling medium, is the natural base, is the acid compensation coefficient for the reuse of cooling medium, is the number of cycles of the cooling medium, is the kinematic viscosity attenuation coefficient of the cooling medium, is the initial kinematic viscosity of the cooling medium, is the limiting kinematic viscosity of the cooling medium.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The transformer cooling of the present invention adopts spray cooling, which is a more efficient cooling method compared with the traditional oil-immersed transformer cooling method. It can accurately adjust the cooling control, realize accurate control of the transformer, and significantly improve the operating state of the transformer, reducing the iron loss and copper loss of the transformer; (2) The present invention monitors the circulation data of the cooling medium of the transformer spray cooling, thereby understanding the storage status of the cooling medium in the transformer and the working status of the transformer, forming a negative feedback mechanism, and timely discovering the fault points of the cooling system and the transformer based on the differences before and after; (3) The present invention monitors the properties of the cooling medium. This design can timely understand the cooling properties of the cooling medium and promptly remove the cooling medium that has deteriorated during the cooling process, thereby avoiding contamination of the entire cooling medium and ensuring the cooling effect of the cooling medium on the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a schematic diagram of a control module of the present invention; Figure 3 It is a schematic diagram of the property monitoring module of the present invention.

[0015] In the figure: 1. Shell; 2. Transformer body; 3. Sprinkler nozzle; 4. Delivery pipe; 5. Recovery pipe; 6. Distributed recovery box; 7. General recovery box. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0017] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0018] The present invention provides the following embodiments Example 1 The embodiment of the present invention provides a photovoltaic power generation system, such as Figure 1-3 As shown, it includes: a photovoltaic power generation component, which is electrically connected to a transformer through a control module, and the transformer is electrically connected to a power grid. The transformer includes a shell 1, in which a plurality of transformer bodies 2 are arranged, a plurality of spray nozzles 3 are arranged on the top of the shell 1, and the plurality of spray nozzles 3 are connected to a pump through a plurality of delivery pipes 4, and a plurality of recovery pipes 5 are arranged below the shell 1, and the plurality of recovery pipes 5 are respectively connected to a plurality of dispersed recovery boxes 6, and the plurality of dispersed recovery boxes 6 are connected to a total recovery box 7, and a discharge pipe is arranged in the plurality of dispersed recovery boxes 6, and a control module is arranged on the transformer, and the control module is used to regulate and distribute the cooling medium in the plurality of delivery pipes 4, and a property monitoring module is arranged in the dispersed recovery box 6, for monitoring the property changes of the circulating cooling medium, and the control module and the property monitoring module are communicated and connected, and flow sensors are arranged on the plurality of delivery pipes 4 and the plurality of recovery pipes 5.

[0019] The working principle and beneficial effects of the above technical solution are as follows: when the transformer is cooled, the pump delivers the cooling medium in the total recovery tank 7 to a number of spray nozzles 3 via a number of delivery pipes 4, and the spray nozzles 3 spray-cool the transformer body 2. The cooling medium after heat exchange is delivered to the dispersed recovery tank 6 via a number of recovery pipes 5 under the shell 1, and then delivered to the total recovery tank 7 via the dispersed recovery tank 6. When the cooling medium deteriorates, it is intercepted in the dispersed recovery tank and then discharged through the discharge pipe. The present invention greatly enhances the heat exchange efficiency between the cooling medium and the transformer by spraying the cooling medium on the transformer body 2, improves the utilization efficiency of the cooling medium, avoids the redundancy of the cooling medium, and avoids the accumulation of impurities at the bottom of the transformer body 2 and interference with the transformer through spray cooling.

[0020] Example 2 Based on Example 1, the control module includes: A cooling medium regulating unit, used to calculate and regulate the cooling medium delivery amount in each delivery pipe 4; A flow monitoring unit is used to monitor the flow data of the cooling medium in each delivery pipe 4 and recovery pipe 5. When the delivery flow data of the cooling medium in the delivery pipe 4 and the recovery flow data of the cooling medium in the recovery pipe 5 are lower than the expected threshold value, an alarm is issued and a filling operation is performed; The status monitoring unit is used to evaluate and judge the working status of the transformer according to the working status of the flow monitoring unit.

[0021] Preferably, the cooling medium conditioning unit comprises: A transformer heating condition monitoring module is used to obtain the heating conditions of several groups of transformer bodies 2; The adjustment delivery amount calculation module is used to calculate the delivery amount of the cooling medium in each delivery pipe 4; = (1); among which, is the cooling medium delivery volume in the i-th delivery pipe 4, is the specific heat capacity of the transformer body 2, is the heat equivalent mass of the transformer body 2, is the heating temperature of the transformer body 2, is the operating temperature of the transformer body 2, is the specific heat capacity of the cooling medium, is the inlet temperature of the cooling medium recovery pipe 5, is the outlet temperature of the cooling medium delivery pipe 4, is the spray density, The coefficient of the transformer body 2 when the spraying is not in effect, the value range is 0-1 and is not equal to 0. It is the diameter of the spray outlet hole.

[0022] Preferably, the status monitoring unit comprises: The statistical module is used to obtain the flow rate and passing time of each cooling medium passing through each delivery pipe 4 and each recovery pipe 5 during the working hours of the day, as well as the time point of each cooling medium passing through each delivery pipe 4 and each recovery pipe 5 on the same day, and to draw the capacity trend curve graph of the delivery pipe 4 and the capacity trend curve graph of the recovery pipe 5 respectively by taking the time point as the horizontal coordinate and multiplying the flow rate and passing time data of each delivery pipe 4 and recovery pipe 5 on the same day; A buffer recording module is used to record the flow rate and passage time of each cooling medium passing through each delivery pipe 4 of the transformer during the working hours of each day in the previous week, record the flow rate and passage time of each cooling medium passing through each recovery pipe 5 of the transformer during the working hours of each day in the previous week, record the time point of each cooling medium passing through each delivery pipe 4 and each recovery pipe 5 of the transformer during the working hours of each day in the previous week, and use the time point data as the horizontal coordinate and the product of the flow rate and passage time data of each delivery pipe 4 within a week as the vertical coordinate to establish a cooling medium transportation capacity trend curve chart, which is used as a temporary transportation benchmark reference value, and use the time point data as the horizontal coordinate and the product of the flow rate and passage time data of each recovery pipe 5 within a week as the vertical coordinate to establish a cooling medium recovery capacity trend curve chart, which is used as a temporary recovery benchmark reference value; Comparison module, if the delivery capacity trend curve of each delivery pipe 4 during the working hours of the day is compared with the temporary delivery benchmark reference value, and the trend curves of the two show a deviation that exceeds the fluctuation benchmark value; if the recovery capacity trend curve of each recovery pipe 5 during the working hours of the day is compared with the temporary recovery benchmark reference value, and the trend curves of the two show a deviation that exceeds the fluctuation benchmark value, an alarm will be issued when any of the above two situations occurs.

[0023] In this embodiment, due to the volatility of photovoltaic power generation, the load of each group of transformer bodies 2 changes according to actual conditions, and the heat generated by the transformer bodies 2 changes with the change of the load; In this embodiment, the cooling medium delivery volume is the volume of cooling medium required for the transformer body 2 to maintain a safe operating temperature; In this embodiment, the circulation data is the single-pass flow rate, the passing time and the time point of the single-pass of the cooling medium in the delivery pipe 4 and the recovery pipe 5; In this embodiment, since the cooling medium has losses such as evaporation and adhesion to the transformer body 2 during the cooling process, the cooling medium delivery amount is greater than or equal to the cooling medium recovery amount; In this embodiment, the flow rate is the flow rate of the cooling medium when it continuously passes through the delivery pipe 4 or the recovery pipe 5, and the passing time is the passing time of the cooling medium at the output port of the delivery pipe 4 or the recovery pipe 5 when the cooling medium continuously passes through the delivery pipe 4 or the recovery pipe 5; In this embodiment, the delivery flow rate trend curve is a curve chart with 24 hours a day as the horizontal axis and the capacity as the vertical axis to establish the coordinate axis, and a number of cooling medium circulation data of each delivery pipe 4 in a day are marked on the coordinate axis to establish the curve chart, wherein the circulation data is the cooling medium passing time point as the horizontal axis, and the product of the passing flow rate and the passing time as the vertical axis. The recovery flow rate trend curve is a curve chart with 24 hours a day as the horizontal axis and the capacity as the vertical axis to establish the coordinate axis, and a number of cooling medium circulation data of each recovery pipe 5 in a day are marked on the coordinate axis to establish the curve chart, wherein the circulation data is the cooling medium passing time point as the horizontal axis, and the product of the passing flow rate and the passing time as the vertical axis; In this embodiment, the temporary delivery reference value is to establish a coordinate axis with 24 hours a day in a week as the horizontal axis and the capacity as the vertical axis, and mark the cooling medium circulation data of each delivery pipe 4 every day in a week on the coordinate axis to comprehensively establish a curve chart, wherein the circulation data is the cooling medium passing time point of the day as the horizontal axis, and the product of the passing flow rate and the passing time as the vertical axis. The temporary recovery reference value is to establish a coordinate axis with 24 hours a day in a week as the horizontal axis and the capacity as the vertical axis, and mark the cooling medium circulation data of each recovery pipe 5 every day in a week on the coordinate axis to comprehensively establish a curve chart, wherein the circulation data is the cooling medium passing time point of the day as the horizontal axis, and the product of the passing flow rate and the passing time as the vertical axis. In this embodiment, the fluctuation reference value is the maximum allowable value of the comprehensive deviation between the transmission capacity trend graph and the temporary transmission reference value when the two are compared; The working principle and beneficial effects of the above technical solution are as follows: due to different transformer loads, the heat generation of the transformer is different. According to the actual heat generation of the transformer, the amount of cooling medium required for each group of transformer bodies is also different. Therefore, the control module is used to allocate and transport cooling medium to each transformer body, and the transportation circulation data and recovery circulation data of the cooling medium are monitored. The working state of the transformer is evaluated according to the allocation of the control module and the transportation circulation data and recovery circulation data of the cooling medium. The allocation of the cooling medium by the control module enhances the regulating ability of the cooling medium on the transformer body 2, and the cooling medium delivery amount can be dynamically adjusted according to the heating condition of the transformer body 2. By monitoring the flow data of the delivery pipe 4 and the recovery pipe 5, the patency of the cooling system can be determined in real time to avoid overload of the transformer caused by blockage of the cooling system. At the same time, according to the real-time flow data, the transformer can be compared to adjust the delivery volume, so as to form a negative feedback mechanism for transformer cooling and timely understand the matching between the actual cooling situation of the transformer and the detection situation; By monitoring the cooling medium circulation data of the transformer in the past and comparing it with the actual cooling medium circulation data of the current transformer, the working status of the transformer can be determined based on the differences between the before and after comparisons, and the minor hidden dangers of the transformer can be discovered in time based on the before and after comparisons, thus eliminating the transformer faults in the bud.

[0024] Example 3 Based on Example 1, the property monitoring module includes: A density detection unit, arranged in a plurality of dispersed recovery boxes 6, is used to detect the density of the cooling medium; A transparency detection unit, arranged in a plurality of dispersed recovery boxes 6, for detecting the transparency of the cooling medium; pH detection units, arranged in the plurality of dispersed recovery boxes 6, for detecting the pH of the cooling medium; A property evaluation unit, used to evaluate the properties of the cooling medium at a certain frequency based on the detection results of the density detection module, the transparency detection module and the pH detection module, and obtain the evaluation results of the cooling medium; The alarm discharge unit is used to intercept the decentralized recovery box 6 and discharge the cooling medium through the discharge pipe when the cooling medium property evaluation result of a decentralized recovery box 6 among several decentralized recovery boxes 6 does not meet the cooling standard of the transformer, and at the same time alarm to remind the staff.

[0025] Preferably, the transparency detection unit comprises: A directional spotlight, which is arranged in the dispersion recovery box 6 and is used to penetrate the cooling medium with a directional light source of a certain light intensity; A light receiving element, which is arranged in the dispersion recovery box 6, is used to receive the directional light source penetrating the cooling medium and detect the light intensity; The transparency evaluation module is used to calculate the transparency parameters of the cooling medium based on a directional spotlight and a light receiving element.

[0026] Preferably, the transparency assessment module includes: A zone division subsystem, used to divide the cooling medium in the dispersed recovery box 6 into different zones; A comprehensive calculation subsystem is used to calculate the regional transparency of the cooling medium in each area according to the illumination intensity of the directional spotlight and the illumination intensity of the light receiving element, and to obtain the overall transparency of the cooling medium in the dispersed recovery box 6 after arithmetic averaging of the regional transparency; = (2); in which: is the transparency of the cooling medium of the ath dispersed recovery box 6, is the transparency conversion coefficient, the value range is 0-1 and is not equal to 0. is the illumination intensity of the jth region, is the refractive index of the cooling medium, The refractive index of air, is the refractive loss rate of the light receiving element, the value range is 0-1 and is not equal to 0. The number of divided areas.

[0027] Preferably, the property evaluation unit comprises: An evaluation calculation module, used for calculating the property state parameters of the cooling medium based on the density detection unit, the transparency detection unit and the pH detection unit; The result comparison module is used to determine the property evaluation result of the cooling medium based on the property evaluation parameter of the cooling medium. When the property evaluation parameter of the cooling medium is lower than the minimum standard property parameter of the cooling medium, it is determined that the cooling medium has deteriorated and the cooling medium cannot be used anymore. When the property evaluation parameter of the cooling medium is lower than the minimum standard property parameter of the cooling medium, it is determined that the cooling medium can still be used.

[0028] Preferably, the evaluation calculation module calculates the property evaluation parameter of the cooling medium based on the following formula: = (3); = (4); among them: among them Evaluate parameters for the properties of the cooling medium, is the cooling medium reuse coefficient, ranging from 0 to 1. is the detection value of the cooling medium by the density detection unit, is the volume of the cooling medium in the distributed cooling box 6, is the surface pressure of the cooling medium, The cumulative usage time of the cooling medium. is the cooling area of ​​the transformer body 2, is the surface evaporation thickness of the cooling medium, is the volatility coefficient of the cooling medium, the value range is 0-1 and is not equal to 0, is the pollution coefficient of cooling medium reuse, ranging from 0 to 1. For the transparency of the cooling medium, is the initial transparency of the cooling medium, is the natural base, and its value is 2.71828. It is the acid compensation coefficient for cooling medium reuse, and its value range is 0-1 and is not equal to 0. is the number of cycles of the cooling medium, is the kinematic viscosity attenuation coefficient of the cooling medium, the value range is 0-1 and is not equal to 0, is the initial kinematic viscosity of the cooling medium, is the limiting kinematic viscosity of the cooling medium.

[0029] In this embodiment, the property evaluation of the cooling medium is to evaluate and determine whether the cooling medium is suitable for continuing to cool the transformer body 2; In this embodiment, the cooling standard of the transformer is the minimum cooling standard of the cooling medium allowed by the transformer; In this embodiment, the cooling medium is divided into different regions, i.e., the surface of the cooling medium is divided into equally divided squares; In this embodiment, the minimum standard property parameter is the minimum property requirement parameter for the cooling medium to meet the transformer cooling performance; The working principle and beneficial effects of the above technical solution are as follows: by regularly monitoring the properties of the cooling medium, the reliability of the cooling medium for the transformer is ensured, and the transformer overload caused by the failure of the cooling medium is avoided, thereby causing production safety problems. The deteriorated cooling medium is intercepted by the design of the dispersed recovery box 6 and the total recovery box 7, and the deteriorated cooling medium is avoided from being polluted as a whole. The monitoring adopts fully automatic detection, and no manual operation is required, which reduces the labor cost and can realize operation and maintenance at a relatively low cost. When the cooling medium is detected to be deteriorated, the operator can be notified in time to replace it, thereby ensuring the stable operation of the transformer. By directly shining a light source through the cooling medium to detect the transparency of the cooling medium, the impact on the cooling medium can be minimized. The entire process does not require contact with the cooling medium, and will not cause the detection device to repeatedly contact different samples to interfere with the detection results. The setting of the detection device will not interfere with the fluidity of the cooling medium and will not reduce the cooling capacity of the cooling system. By dividing the cooling medium into different areas and performing gridded transparency detection, the inaccuracy of detection caused by local contamination in the cooling medium is avoided. In addition, through grid division, the dispersion of light sources during the overall transparency detection of the cooling medium can be reduced, and the error of the transparency detection of the cooling medium can be reduced. At the same time, gridded detection can improve the efficiency of detection, avoid detection duplication and interference with detection, and at the same time, the arithmetic mean value of the transparency detection results of each area can accurately reflect the transparency of the cooling medium. When calculating the property evaluation parameters of the cooling medium, the first thing that is contaminated during the use of the cooling medium is the purity of the cooling medium. First, the reuse of the cooling medium and the purity of the cooling medium during the reuse are evaluated. Based on the degree of contamination of the purity during the reuse of the cooling medium, the degree of change of the chemical properties of the cooling medium caused by heat during the heat exchange process is further evaluated. The impact of the change in the chemical properties of the cooling medium on the heat exchange performance of the cooling medium is evaluated. The properties of the cooling medium are comprehensively judged through the combination of physics and chemistry, which improves the accuracy of the cooling medium property evaluation parameters and ensures that the property evaluation parameters can accurately reflect the state of the cooling medium.

[0030] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A photovoltaic power generation system, characterized in that: include: A photovoltaic power generation component, wherein the photovoltaic power generation component is electrically connected to a transformer through a control module, and the transformer is electrically connected to a power grid. The transformer comprises a shell (1), wherein a plurality of transformer bodies (2) are arranged in the shell (1), wherein a plurality of spray nozzles (3) are arranged on the top of the shell (1), wherein the plurality of spray nozzles (3) are connected to a pump through a plurality of delivery pipes (4), wherein a plurality of recovery pipes (5) are arranged below the shell (1), wherein the plurality of recovery pipes (5) are respectively connected to a plurality of dispersed recovery boxes (6), wherein the plurality of dispersed recovery boxes (6) are connected to a total recovery box (7), wherein a discharge pipe is arranged in the plurality of dispersed recovery boxes (6), wherein a control module is arranged on the transformer, wherein the control module is used for regulating and distributing a cooling medium in the plurality of delivery pipes (4), wherein a property monitoring module is arranged in the dispersed recovery box (6), wherein the property monitoring module is used for monitoring property changes of a circulating cooling medium, wherein the control module and the property monitoring module are connected in communication, and wherein flow sensors are arranged on the plurality of delivery pipes (4) and the plurality of recovery pipes (5).

2. A photovoltaic power generation system according to claim 1, characterized in that: The control module includes A cooling medium regulating unit, used for calculating and regulating the cooling medium delivery amount in each delivery pipe (4); A flow monitoring unit is used to monitor the flow data of the cooling medium in each delivery pipe (4) and recovery pipe (5), and when the delivery flow data of the cooling medium in the delivery pipe (4) and the recovery flow data of the cooling medium in the recovery pipe (5) are lower than an expected threshold value, an alarm is issued and a filling operation is performed; The status monitoring unit is used to evaluate and judge the working status of the transformer according to the working status of the flow monitoring unit.

3. A photovoltaic power generation system according to claim 3, characterized in that: The cooling medium conditioning unit includes: A transformer heating condition monitoring module, used to obtain heating conditions of a plurality of sets of transformer bodies (2); A flow rate calculation module is used to calculate the flow rate of cooling medium in each delivery pipe (4); = (1); among which, is the cooling medium delivery volume in the i-th delivery pipe (4), is the specific heat capacity of the transformer body (2), is the heat equivalent mass of the transformer body (2), is the heating temperature of the transformer body (2), is the operating temperature of the transformer body (2), is the specific heat capacity of the cooling medium, is the inlet temperature of the cooling medium recovery pipe (5), is the outlet temperature of the cooling medium delivery pipe (4), is the spray density, is the coefficient of the transformer body (2) without spraying, Diameter of the spray outlet.

4. A photovoltaic power generation system according to claim 3, characterized in that: The condition monitoring unit includes: A statistical module is used to obtain the flow rate and passage time of each cooling medium passing through each delivery pipe (4) and each recovery pipe (5) during the working hours of the day, as well as the time point of each cooling medium passing through each delivery pipe (4) and each recovery pipe (5), and to draw a capacity trend curve graph of the delivery pipe (4) and a capacity trend curve graph of the recovery pipe (5) respectively by taking the time point as the horizontal axis and multiplying the flow rate and passage time data of each delivery pipe (4) and recovery pipe (5) during the time of the day; A buffer recording module is used to record the flow rate and passage time of each cooling medium passing through each delivery pipe (4) during the working hours of each day in the previous week of the transformer, record the flow rate and passage time of each cooling medium passing through each recovery pipe (5) during the working hours of each day in the previous week of the transformer, record the time point of each cooling medium passing through each delivery pipe (4) and each recovery pipe (5) during the working hours of each day in the previous week of the transformer, and establish a cooling medium delivery capacity trend curve chart with the time point data as the horizontal coordinate and the product of the flow rate and passage time data of each delivery pipe (4) within a week as the vertical coordinate, and use it as a temporary delivery benchmark reference value, and establish a cooling medium recovery capacity trend curve chart with the time point data as the horizontal coordinate and the product of the flow rate and passage time data of each recovery pipe (5) within a week as the vertical coordinate, and use it as a temporary recovery benchmark reference value; The comparison module is configured to generate an alarm when the trend curve of the delivery capacity of each delivery pipe (4) during the working hours of the day is compared with the temporary delivery benchmark reference value and the trend curves of the two show a deviation exceeding the fluctuation benchmark value; and when the trend curve of the recovery capacity of each recovery pipe (5) during the working hours of the day is compared with the temporary recovery benchmark reference value and the trend curves of the two show a deviation exceeding the fluctuation benchmark value.

5. A photovoltaic power generation system according to claim 2, characterized in that: Property monitoring modules include: A density detection unit, arranged in a plurality of dispersed recovery boxes (6), for detecting the density of the cooling medium; A transparency detection unit, arranged in a plurality of dispersed recovery boxes (6), for detecting the transparency of the cooling medium; A pH detection unit is arranged in the plurality of dispersed recovery boxes (6) and is used to detect the pH of the cooling medium; A property evaluation unit, used to evaluate the properties of the cooling medium at a certain frequency based on the detection results of the density detection module, the transparency detection module and the pH detection module, and obtain the evaluation results of the cooling medium; The alarm discharge unit is used to intercept the decentralized recovery box (6) and discharge the cooling medium through the discharge pipe when the cooling medium property evaluation result of a decentralized recovery box (6) among the multiple decentralized recovery boxes (6) does not meet the cooling standard of the transformer, and to alarm to prompt the staff at the same time.

6. A photovoltaic power generation system according to claim 5, characterized in that: The transparency detection unit includes: A directional spotlight, which is arranged in the dispersed recovery box (6) and is used to penetrate the cooling medium with a directional light source of a certain light intensity; A light receiving element, which is arranged in the dispersion recovery box (6) and is used to receive the directional light source penetrating the cooling medium and detect the light intensity; Transparency evaluation module, used to calculate the transparency parameters of cooling media based on directional spotlights and light receiving elements.

7. A photovoltaic power generation system according to claim 6, characterized in that: The transparency assessment module includes: A zone division subsystem, used to divide the cooling medium in the decentralized recovery box (6) into different zones; A comprehensive calculation subsystem is used to calculate the regional transparency of the cooling medium in each area according to the light intensity of the directional spotlight and the light intensity of the light receiving element, and the overall transparency of the cooling medium in the dispersed recovery box (6) is obtained by arithmetic averaging the regional transparency; = (2); in which: is the transparency of the cooling medium in the ath dispersed recovery box (6), is the transparency conversion coefficient, is the illumination intensity of the jth region, is the refractive index of the cooling medium, The refractive index of air, is the refractive loss rate of the light receiving element, The number of divided areas.

8. A photovoltaic power generation system according to claim 5, characterized in that: The property assessment units include: An evaluation calculation module, used for calculating the property state parameters of the cooling medium based on the density detection unit, the transparency detection unit and the pH detection unit; The result comparison module is used to determine the property evaluation result of the cooling medium based on the property evaluation parameter of the cooling medium. When the property evaluation parameter of the cooling medium is lower than the minimum standard property parameter of the cooling medium, it is determined that the cooling medium has deteriorated and the cooling medium cannot be used anymore. When the property evaluation parameter of the cooling medium is lower than the minimum standard property parameter of the cooling medium, it is determined that the cooling medium can still be used.

9. A photovoltaic power generation system according to claim 8, characterized in that: The evaluation calculation module calculates the property evaluation parameters of the cooling medium based on the following formula: = （3）； = (4); in which: Evaluate parameters for the properties of the cooling medium, is the recycling coefficient of cooling medium, is the detection value of the cooling medium by the density detection unit, is the volume of the cooling medium in the dispersed recovery box (6), is the surface pressure of the cooling medium, The cumulative usage time of the cooling medium. is the cooling area of ​​the transformer body (2), is the surface evaporation thickness of the cooling medium, is the volatility coefficient of the cooling medium, is the pollution coefficient of the reuse of cooling medium, For the transparency of the cooling medium, is the initial transparency of the cooling medium, is the natural base, is the acid compensation coefficient for the reuse of cooling medium, is the number of cycles of the cooling medium, is the kinematic viscosity attenuation coefficient of the cooling medium, is the initial kinematic viscosity of the cooling medium, is the limiting kinematic viscosity of the cooling medium.

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