CN114781179B - Photovoltaic power station generated energy loss verification method based on optical fiber communication information acquisition - Google Patents
Photovoltaic power station generated energy loss verification method based on optical fiber communication information acquisition Download PDFInfo
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Abstract
The invention relates to the technical field of photovoltaic power generation, in particular to a method for verifying the loss of the generated energy of a photovoltaic power station based on optical fiber communication information acquisition. The method comprises the following steps: s1, preliminarily comparing the predicted generated energy and the actual power transmission amount of a photovoltaic power station, and judging the preliminary range of a fault; s2, according to the primary range of faults, secondary comparison is carried out on actual generated energy and actual transmitted energy of a photovoltaic panel, in the method for checking and determining the loss of the generated energy of the photovoltaic power station based on the optical fiber communication information acquisition, the generated energy is sequentially compared with the actual transmitted energy and the actual generated energy through prediction of the generated energy, the range of the faults is gradually reduced, a final fault source is obtained, and a worker carries out different maintenance work according to the source of the faults, so that the problem that the power loss monitoring cannot specifically judge the source of the power loss is solved, meanwhile, the distance between the two is far away, and the worker needs to consume long time during maintenance.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a method for verifying the loss of the generated energy of a photovoltaic power station based on optical fiber communication information acquisition.
Background
The photovoltaic power station is a power generation system which is formed by using solar energy and electronic elements made of special materials such as a crystalline silicon plate, an inverter and the like, and is connected with a power grid and transmits power to the power grid. The photovoltaic power station belongs to the green power development energy project with the greatest national encouragement.
A plurality of computers can be arranged in the photovoltaic power station to monitor the electric quantity information of the photovoltaic panel in real time, so that the monitoring of the electric quantity can be realized, and the monitoring of the electric quantity can be realized.
When the electric quantity loss is monitored, a computer can judge the working state of a power station by comparing predicted electric quantity with actual electric quantity, when the predicted electric quantity is more than the actual electric quantity, the power station is in an abnormal state, workers need to be dispatched to overhaul the power station, but the photovoltaic power station comprises devices such as a photovoltaic panel and a transformer, the electric quantity loss monitoring cannot specifically judge the source of the electric quantity loss, and overhaul tools of the devices such as the photovoltaic panel and the transformer are different, and meanwhile, the distance between the photovoltaic panel and the transformer is long, so that the workers need to spend long time in overhauling;
and when the photovoltaic panel is used for a long time, the surface of the photovoltaic panel can be stained with dust, and the predicted electric quantity can cause prediction deviation due to the influence of the dust on the photovoltaic panel, so that the predicted result is influenced.
Disclosure of Invention
The invention aims to provide a method for checking and determining the power generation loss of a photovoltaic power station based on optical fiber communication information acquisition, so as to solve the problems in the background technology.
In order to achieve the purpose, the method for checking and determining the power generation loss of the photovoltaic power station based on the optical fiber communication information acquisition is provided, and comprises the following steps:
s1, preliminarily comparing the predicted generated energy and the actual power transmission amount of a photovoltaic power station, and judging the preliminary range of a fault;
s2, secondarily comparing the actual power generation amount and the actual power transmission amount of the photovoltaic panel according to the initial range of the fault, and reducing the range of the fault again;
s3, comparing the predicted generated energy with the actual generated energy through a secondary comparison result to obtain a final loss direction;
and S4, sending the information of the final loss direction to a worker, so that the worker determines the source of the fault.
As a further improvement of the technical solution, the acquiring of each item of data of the electric quantity in the photovoltaic power station in S1 includes the following steps:
s1.1, acquiring the predicted power generation amount of the photovoltaic panel; s1.2, acquiring the actual power transmission quantity of the transformer;
s1.3, setting a comparison threshold value between the predicted power generation amount and the actual power transmission amount; s1.3, comparing the predicted power generation amount with the actual power transmission amount according to a comparison threshold:
when the difference between the predicted power generation amount and the actual power transmission amount is within the comparison threshold range, the photovoltaic panel and the transformer are not failed;
when the difference between the predicted power generation amount and the actual power transmission amount is larger than the comparison threshold range, the transformer is possibly out of order.
As a further improvement of the technical solution, in S2, according to the primary comparison result, the secondary comparison between the power generation amount and the power transmission amount of the photovoltaic panel is performed, including the following method steps:
s2.1, when the difference between the predicted power generation amount and the actual power transmission amount is larger than the comparison threshold range, acquiring the actual power generation amount of the photovoltaic panel;
s2.2, comparing the actual generated energy with the actual power transmission amount of the transformer:
when the actual power generation amount is larger than the actual power transmission amount, the transformer is represented to have a fault;
when the actual power generation amount is equal to the actual power transmission amount, the transformer is free of faults; .
As a further improvement of the technical solution, in the step S3, the dust amount is counted according to the secondary comparison result, and the method includes the following steps:
s3.1, setting a difference threshold value between the predicted power generation amount and the actual power generation amount; s3.2, comparing the difference between the predicted power generation amount and the actual power generation amount according to the difference threshold:
when the difference between the predicted power generation amount and the actual power generation amount exceeds the difference threshold range, the photovoltaic panel is abnormal; and when the difference value between the predicted power generation amount and the actual power generation amount is within the difference threshold range, the photovoltaic panel is in a normal working state.
And S3.3, acquiring the dust accumulation amount on the surface of the photovoltaic panel, and calculating the influence of the dust on the photovoltaic panel and the aging rate of the photovoltaic panel.
As a further improvement of the technical solution, a calculation formula for obtaining the dust accumulation amount on the surface of the photovoltaic panel in S3.3 is as follows:
in the formula Q y The amount of dust falling onto the surface of the photovoltaic panel; v is the running speed of the vehicle; p is road surface condition (expressed as road surface dust coverage per square meter); m is the weight of the vehicle；。
As a further improvement of the technical solution, a calculation formula of the influence of the dust in S3.3 on the photovoltaic panel is as follows:
SL＝Y-S；
in the formula: s is actual generated energy; s m Is the monthly shading rate; y is the predicted generating capacity; x is the number of cleaning times per month; SL is the accumulated dust and loss electric quantity.
As a further improvement of the technical solution, a calculation formula of the photovoltaic panel aging rate in S3.3 is as follows:
LH＝Y-(SL+S)+1；
in the formula: LH is the aging rate; y is the predicted generating capacity; SL is the electric quantity lost by accumulated dust; and S is the actual power generation amount of the photovoltaic panel.
As a further improvement of the present technical solution, the S3 further includes the following steps:
and S3.4, adjusting the predicted power generation amount according to the influence of dust on the actual power generation amount of the photovoltaic panel.
As a further improvement of the technical solution, an adjustment formula for adjusting the predicted power generation amount in S3.4 is as follows:
Y t ＝Y-SL；
in the formula: y is t The adjusted predicted power generation amount; y is the original predicted power generation amount; SL is the electric quantity lost by deposition.
As a further improvement of the technical solution, in the information transmission method in the final loss direction in S4, the information is transmitted using an optical fiber as a medium.
Compared with the prior art, the invention has the following beneficial effects:
1. in the photovoltaic power station generated energy loss verification method based on optical fiber communication information acquisition, the generated energy is compared with the actual power transmission amount and the actual generated energy in sequence through prediction, the range of faults is gradually reduced, the final fault source is obtained, the staff carries out maintenance work on different reasons according to the fault source, the problem that the power loss monitoring cannot specifically judge the source of power loss is solved, maintenance tools of devices such as a photovoltaic panel and a transformer are different, meanwhile, the distance between the photovoltaic panel and the transformer is far away, and the staff needs to consume long time during maintenance is solved.
2. According to the method for verifying the power generation loss of the photovoltaic power station based on the optical fiber communication information, the predicted power generation amount is adjusted according to the influence of dust on the actual power generation amount of the photovoltaic panel, so that the predicted power generation amount is calibrated, and the prediction is more accurate.
Drawings
FIG. 1 is a block flow diagram of the overall method steps of the present invention;
FIG. 2 is a block flow diagram of the method steps of the present invention for comparing predicted power generation to actual power generation;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
A first embodiment, please refer to fig. 1-2, provides a method for checking and determining power generation loss of a photovoltaic power station based on optical fiber communication information acquisition, comprising the following steps:
s1, preliminarily comparing the predicted generated energy and the actual power transmission amount of a photovoltaic power station, and judging the preliminary range of a fault;
s2, according to the primary range of the fault, secondarily comparing the actual power generation amount with the actual power transmission amount of the photovoltaic panel, and reducing the range of the fault again;
s3, comparing the predicted power generation amount with the actual power generation amount through a secondary comparison result to obtain a final loss direction;
s4, sending the information of the final loss direction to the working staff, enabling the working staff to determine the source of the fault, sequentially comparing the predicted generated energy with the actual power transmission amount and the actual generated energy, gradually reducing the range of the fault, obtaining the final fault source, and enabling the working staff to carry out different maintenance work according to the fault source.
In addition, the method for acquiring various data of the electric quantity in the photovoltaic power station in the S1 comprises the following steps:
s1.1, acquiring the predicted generating capacity of the photovoltaic panel; the predicted power generation amount is calculated according to the past power generation amount and the future weather;
s1.2, acquiring the actual power transmission quantity of the transformer;
s1.3, setting a comparison threshold value between the predicted power generation amount and the actual power transmission amount; because the predicted power generation amount and the actual power transmission amount cannot be in hundred percent, the difference between the predicted power generation amount and the actual power transmission amount is avoided by setting a threshold value;
s1.3, comparing the predicted power generation amount with the actual power transmission amount according to a comparison threshold:
when the difference between the predicted power generation amount and the actual power transmission amount is within the comparison threshold range, the photovoltaic panel and the transformer are not in fault;
when the difference between the predicted power generation amount and the actual power transmission amount is larger than the comparison threshold range, the transformer may have a fault, the actual power generation amount is reduced due to the fact that the photovoltaic panel is influenced by external factors (such as dust) in the process of power generation, the actual power transmission amount of the transformer is reduced, the predicted power generation amount is larger than the actual power transmission amount, and the next comparison is still needed at the moment, specifically referring to S2.
Further, in the step S2, secondary comparison is carried out on the electricity generation amount and the electricity transmission amount of the photovoltaic panel according to the primary comparison result, and the method comprises the following steps:
s2.1, when the difference between the predicted power generation amount and the actual power transmission amount is larger than the comparison threshold range, acquiring the actual power generation amount of the photovoltaic panel;
s2.2, comparing the actual generated energy with the actual power transmission amount of the transformer:
when the actual generating capacity is larger than the actual power transmission capacity, the transformer is represented to have a fault;
when the actual power generation amount is equal to the actual power transmission amount, the transformer is free of faults; since the transformer is not faulty, the predicted power generation is greater than the actual power transmission, and there is another factor that the photovoltaic panel may have problems, see S3.
Still further, in S3, the dust amount is counted according to the secondary comparison result, which includes the following steps:
s3.1, setting a difference threshold value between the predicted power generation amount and the actual power generation amount; considering that a certain difference exists between the predicted power generation amount and the actual power generation amount due to the expected influences of temperature, weather environment and the like, the difference is avoided by setting a difference threshold, and the difference threshold can be set according to the actual use condition of the area, which is not limited herein.
S3.2, comparing the difference between the predicted power generation amount and the actual power generation amount according to the difference threshold:
when the difference between the predicted power generation amount and the actual power generation amount exceeds the difference threshold range, the photovoltaic panel is abnormal; the unusual cause of photovoltaics is, however, the natural ageing of the surface material of the photovoltaic panel, and the dust on the surface of the photovoltaic panel, see S3.3.
And when the difference value between the predicted power generation amount and the actual power generation amount is within the difference threshold range, the photovoltaic panel is in a normal working state.
And S3.3, acquiring the dust accumulation amount on the surface of the photovoltaic panel, and calculating the influence of the dust on the photovoltaic panel and the aging rate of the photovoltaic panel.
Specifically, the calculation formula for obtaining the dust accumulation amount on the surface of the photovoltaic panel in S3.3 is as follows:
in the formula Q y The amount of dust falling onto the surface of the photovoltaic panel; v is the running speed of the vehicle; p is road surface condition (expressed as dust coverage per square meter of road surface); m is the weight of the vehicle; the biggest influence is dust brought by a vehicle when passing, the quantity of the dust is not easy to determine, and the calculation of the quantity of the dust is difficult, so that the influence of the vehicle on the dust when passing is determined by the running speed V of the vehicle, the road surface condition P and the weight M of the vehicle, and meanwhile, the dust cannot completely fall on the surface of the photovoltaic panel, and 0.123 is the area of the surface of the photovoltaic panel where the dust falls; (M) 0.85 Part of dust carried by the vehicle, that is to say 0.85 is the probability that the dust is carried by the vehicle,
in the specification, 0.5 represents the probability of sunny days and rainy days, that is, half the probability is sunny days and half the probability is rainy days, when raining, dust cannot float in the air, that is, cannot fall onto the photovoltaic panel, when raining, the dust on the road surface can float, and 0.72 represents the coverage rate of the dust on the road surface after raining. .
In addition, the calculation formula of the influence of the dust on the photovoltaic panel in S3.3 is as follows:
SL＝Y-S；
in the formula: s is actual generated energy; s. the m Is the monthly shading rate; y is the predicted generating capacity; x is the number of cleaning per month(ii) a SL is accumulated dust and electric quantity loss; after the dust amount is determined, the shielding rate of the dust on the photovoltaic panel and the cleaning times are calculated according to the dust amount to obtain the actual power generation amount S, and then the predicted power amount Y is subtracted from the actual power generation amount S to obtain the accumulated dust loss power amount SL.
Further, the calculation formula of the photovoltaic panel aging rate in S3.3 is as follows:
LH＝Y-(SL+S)+1；
in the formula: LH is the aging rate; y is the predicted generating capacity; SL is the electric quantity lost by accumulated dust; and S is the actual power generation amount of the photovoltaic panel, the loss power SL and the actual power generation amount S are added to obtain a result, the result is compared with the predicted power generation amount Y, when the result is less than 1, the influence of dust is shown, and when the result is more than 1, the photovoltaic panel is aged.
A second embodiment, which is implemented on the basis of the first embodiment, in order to improve the accuracy of the predicted power generation amount, S3 further includes the following method steps:
and S3.4, considering that the predicted power generation amount generates a certain deviation along with the state of the photovoltaic panel, and adjusting the predicted power generation amount according to the influence of dust on the actual power generation amount of the photovoltaic panel when the power generation amount loss of the photovoltaic panel due to dust is calculated.
In S3.4, the adjustment formula for adjusting the predicted power generation amount is as follows:
Y t ＝Y-SL；
in the formula: y is t The adjusted predicted power generation amount; y is the original predicted power generation amount; SL is the electric quantity lost by dust deposition.
In addition, in order to improve the quality of information transmission, the information is transmitted by taking the optical fiber as a medium in the information transmission mode of the final loss direction in the S4, the optical fiber has long connection distance, high transmission speed and low transmission loss, the number of relay stations can be reduced in a communication line, and the communication quality is improved, namely, the information can be timely and stably transmitted to a worker by using the optical fiber, so that the worker can timely process the fault.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The method for verifying the power generation capacity loss of the photovoltaic power station based on the optical fiber communication information acquisition is characterized by comprising the following steps of: the method comprises the following steps:
s1, preliminarily comparing the predicted power generation amount and the actual power transmission amount of the photovoltaic power station, and judging a preliminary range of a fault;
s2, according to the primary range of the fault, secondarily comparing the actual power generation amount with the actual power transmission amount of the photovoltaic panel, and reducing the range of the fault again;
s3, comparing the predicted generated energy with the actual generated energy through a secondary comparison result to obtain a final loss direction;
s4, sending the information of the final loss direction to a worker, so that the worker determines the source of the fault;
the method for acquiring various data of the electric quantity in the photovoltaic power station in the S1 comprises the following steps:
s1.1, acquiring the predicted power generation amount of the photovoltaic panel; s1.2, acquiring actual output electric quantity of the transformer;
s1.3, setting a comparison threshold value between the predicted power generation amount and the actual power transmission amount; s1.3, comparing the predicted power generation amount with the actual power transmission amount according to a comparison threshold:
when the difference between the predicted power generation amount and the actual power transmission amount is within the comparison threshold range, the photovoltaic panel and the transformer are not failed;
when the difference between the predicted power generation amount and the actual power transmission amount is larger than the comparison threshold range, the transformer is possibly out of order;
in the S2, secondary comparison is carried out on the electricity generation quantity and the electricity transmission quantity of the photovoltaic panel according to the primary comparison result, and the method comprises the following steps:
s2.1, when the difference between the predicted power generation amount and the actual power transmission amount is larger than the comparison threshold range, acquiring the actual power generation amount of the photovoltaic panel;
s2.2, comparing the actual generated energy with the actual power transmission amount of the transformer:
when the actual generating capacity is larger than the actual power transmission capacity, the transformer is represented to have a fault;
when the actual power generation amount is equal to the actual power transmission amount, the transformer is free of faults;
in the step S3, the dust amount is counted according to the secondary comparison result, and the method comprises the following steps:
s3.1, setting a difference threshold value between the predicted power generation amount and the actual power generation amount; s3.2, comparing the difference between the predicted power generation amount and the actual power generation amount according to the difference threshold:
when the difference between the predicted power generation amount and the actual power generation amount exceeds the difference threshold range, the photovoltaic panel is abnormal; when the difference value between the predicted power generation amount and the actual power generation amount is within the difference threshold value range, the photovoltaic panel is in a normal working state;
s3.3, acquiring the dust accumulation amount on the surface of the photovoltaic panel, and calculating the influence of dust on the photovoltaic panel and the aging rate of the photovoltaic panel;
the calculation formula for obtaining the dust accumulation amount on the surface of the photovoltaic panel in the S3.3 is as follows:
in the formula
The amount of dust falling onto the surface of the photovoltaic panel; />
Is the running speed of the vehicle; />
The condition of the road surface; />
Is the weight of the vehicle;
by the speed of travel of the vehicle
Road surface condition P, and vehicle weight M, to determine the effect of the vehicle on dust when passing, and ` pick `>
The area of dust falling on the surface of the photovoltaic panel; />
Is part of the dust carried by the vehicle>
For the probability of dust being picked up by the vehicle>
Middle, or>
Indicates the probability of sunny and rainy days, and>
indicating the coverage of dust on the road surface after rain.
2. The method for verifying the power generation amount loss of the photovoltaic power station based on the optical fiber communication information acquisition is characterized in that: and in S3.3, a calculation formula of the influence of the dust on the photovoltaic panel is as follows:
in the formula:
the actual power generation amount is obtained; />
Is the monthly shading rate; />
To predict the power generation; />
The number of cleaning times per month; />
In order to accumulate dust and lose electric quantity, after the dust quantity is determined, the shielding rate of the dust on the photovoltaic panel and the cleaning times are calculated according to the dust quantity, and the actual generating capacity is obtained>
And then the predicted charge is->
Minus the actual power generation->
The accumulated ash loss electric quantity SL can be obtained.
3. The method for verifying the power generation loss of the photovoltaic power station based on the optical fiber communication information acquisition of claim 2 is characterized in that: the S3 further comprises the following method steps:
and S3.4, adjusting the predicted power generation amount according to the influence of dust on the actual power generation amount of the photovoltaic panel.
4. The method for verifying the power generation amount loss of the photovoltaic power station based on the optical fiber communication information acquisition is characterized in that: in S3.4, an adjustment formula for adjusting the predicted power generation amount is as follows:
in the formula:
the adjusted predicted power generation amount; />
Generating power for the original forecast; />
The electricity lost by the accumulated dust is used.
5. The method for verifying the power generation amount loss of the photovoltaic power station based on the optical fiber communication information acquisition is characterized in that: and in the S4, the information is transmitted by taking the optical fiber as a medium in the information transmission mode of the final loss direction.
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| WO2021179700A1 (en) * | 2020-03-12 | 2021-09-16 | 深圳前海微众银行股份有限公司 | Electricity generation prediction method, apparatus and device, and computer readable storage medium |
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