[0038] Combine figure 1 and figure 2 To illustrate. The first embodiment of the present invention provides an error correction method for cleaning solar modules, including:
[0039] Abnormal judgment step (S101), when all components of the solar module system are operating normally, and the sunshine rate is sufficient but the output voltage of the solar module is lower than the rated voltage, it is judged that there is an external factor that causes the power generation to decrease, and further influences are based on power generation. Power generation power to be calculated;
[0040] In the step of selecting the generated power of the solar module (S102), the generated power of the solar module within 40% of the rated power is selected as the power to be calculated (refer to figure 1 );
[0041] The step of calculating the interval generated power loss of the solar module (S103), using the to-be-calculated generated power to calculate the interval generated power loss of the solar module;
[0042] The step of converting generated power loss cost (S104), converting the calculated interval generated power loss into a loss cost;
[0043] The step of calculating the total power loss cost (S105), through the interval power loss cost to calculate the total power loss cost equal to the cleaning cost; and
[0044] In the step of determining the cleaning time point (S106), the cleaning time point is determined based on the total power loss cost.
[0045] Next, each step of the method of the present invention will be described in detail. In step S101, all components of the solar module system 1 are operating normally, that is, when the power generation loss (for example, line loss, maximum power tracking loss, etc.) caused by the internal factors of the solar module system 1 is excluded, and When the sunshine rate is sufficient but the output voltage of the evaluation module 3 of the solar module system 1 is lower than the rated voltage (for example, when the sunshine rate is 500W/m 2 When the output voltage of the evaluation module 3 of the solar module system 1 is lower than the rated voltage (for example, 24V), it is judged that external factors cause the power generation of the evaluation module 3 of each solar module system 1 to decrease, which further affects the The generated power to be calculated. The external factors here include factors such as dirt or dust, or frost or shadow shading. The power generation to be calculated is the power generation power actually used to calculate the power loss.
[0046] Next, in step S102, the power generated by the evaluation module 3 of the solar module system 1 within a range of more than 40% of the rated power is selected as the power to be calculated. For example, when the rated power generation of the evaluation module 3 of the solar module system 1 is 300W, the power generation power of 300W*40%=120W or more is selected as the power generation to be calculated (refer to figure 1 ).
[0047] Through the above steps S101 and S102, the power generation drop caused by external factors can be excluded, and the to-be-calculated power generation power of each solar module can be sampled with high accuracy.
[0048] Next, combine the reference image 3 , To explain steps S103 to S106 to calculate the cleaning time point. In step S103, a time interval (starting point T 1 And terminal T x ), where multiple samplings are performed in the interval to obtain multiple sampling points. Then, the power loss of all sampling points in the interval is calculated, and the power loss calculation method of each sampling point is obtained by subtracting the power to be calculated from the reference module 2 of the sampling point from the power to be calculated from the evaluation module 3. Then, the linear relationship between the time of all sampling points in the interval and the loss power is obtained, and the relationship between the time and the loss power straight line Sr1 and the starting point T of the interval 1 Power loss a 1 And the end of the interval T x Power loss a 2 To calculate the interval loss power a 3.
[0049] In addition, the sampling method of the above-mentioned sampling points can be set to update data at a predetermined time point t by using the display unit 5. The predetermined time point t can be determined according to the length of the time interval, for example, to update the data daily, weekly, or monthly.
[0050] Next, in step S104, the interval power loss a calculated in step S103 will be converted by the unit power generation cost. 3 The loss cost L (for example, when the cost per kilowatt-hour (kW) is 5 yuan, the loss of power in a day (a 3 ) Is 200kW, the loss cost is 200kW*5=1000 yuan).
[0051] Further, in step S105, the relationship between the time in the interval calculated in step S103 and the lost power straight line Sr1 and the generated power loss cost a in this interval are used 3 To calculate the total power loss a when equal to the cleaning cost C total The total generated power loss cost L1.
[0052] Finally, in step S106, the total generated power loss cost L1 calculated in step S103 and the regression line Sr1 between time and loss power calculated in step S103 are brought into the following formula (1) to determine the solar module cleaning time point Fct;
[0053] Formula 1):
[0054] F ct :Time point of solar module cleaning
[0055] L1: Total power loss cost
[0056] Sr1: The linear relationship between time and power loss.
[0057] The cleaning error correction method of the solar module related to the first embodiment of the present invention may further include the step S107 of selecting the generated power of the solar module by the inverter between step S102 and step S103, and the selected step S102 is selected. The generated power within 10% of the rated power of the inverter is used as the generated power to be calculated. To perform this step, the solar module system 1 using the present invention further includes an inverter 6.
[0058] Through step S107, the power generation can be further selected, and the to-be-calculated power generation power of the evaluation module 3 of each solar module system 1 can be sampled with higher accuracy to perform high-precision calculation of the cleaning time of the solar module.
[0059] The cleaning error correction method of the solar module related to the first embodiment of the present invention may further include a cleaning step after the step of determining the cleaning time point (S106). In the cleaning step, cleaning is performed when the total power generation power loss cost L1 is equal to the cleaning cost C. To perform this step, the solar module system 1 of the present invention further includes a cleaning system 7. The cleaning system 7 includes, for example, a cleaning device (not shown); a cleaning control component (not shown) for determining the cleaning area, schedule, and cleaning method of the cleaning device to clean solar modules, etc.; and an action confirmation component ( (Not icon), the cleaning action is confirmed by the image, the switch signal of the cleaning device or the value of the DC meter.
[0060] The cleaning device is arranged on the evaluation module 3, and can be various physical cleaning devices, such as a liquid spray device, a gas blowing device, a mechanical brush head, or a scraper.
[0061] According to the error correction method for solar module cleaning related to the first embodiment of the present invention, the cleaning time point of the solar module can be judged with high accuracy, and various external factors can be eliminated to avoid premature or short period of time. Perform cleaning operations.
[0062] Further, refer to image 3 A description will be given of the error correction method of the solar module cleaning related to the second embodiment of the present invention. image 3 It shows a flowchart of a method for correcting errors in the cleaning of a solar module according to the second embodiment of the present invention.
[0063] The second embodiment of the present invention provides an error correction method for cleaning solar modules, including:
[0064] Abnormality judgment step (S201), when all components of the solar module system 1 are operating normally, and the sunshine rate is sufficient, but the output voltage of the evaluation module 3 of the solar module system 1 is lower than the rated voltage, it is judged that there is an external factor causing power generation The power drop further affects the power generation to be calculated based on the power generation;
[0065] In the external factor judgment step (S202), it is judged that the external factor is caused by dirt or dust, or frost or shadow. If the external factor is dirt or dust, the calculation of the solar module described later is performed The step of generating power loss in the interval (S204), if the external factor is frost or shadowing, proceed to the step of selecting the generated power of the solar module (S203) described later;
[0066] In the step of selecting the generated power of the solar module (S203), the generated power of the evaluation module 3 of the solar module system 1 within the range of more than 40% of the rated generated power is selected as the to-be-calculated generated power;
[0067] The step of calculating the interval generated power loss of the solar module (S204), using the to-be-calculated generated power to calculate the interval generated power loss of the solar module;
[0068] The step of converting generated power loss cost (S205), converting the calculated interval generated power loss into a loss cost;
[0069] The step of calculating the total power loss cost (S206), calculate the total power loss cost equal to the cleaning cost through the interval power loss cost; and
[0070] In the step of judging the cleaning time point (S207), the cleaning time point is judged based on the total power loss cost.
[0071] Since the steps S201, S203-S207 in the method of cleaning the solar module in the second embodiment of the present invention are the same as the steps S101-S106 in the method of cleaning the solar module in the first embodiment, only the steps S202 will be described in detail.
[0072] Step S202: After step S201 is performed, and after knowing that external factors have caused the power generation to decrease, turn on the monitoring system (not shown) to actually understand what external factors of the solar module cause the power generation to decrease. If the factor is dirt or dust, skip step S203 and proceed directly to step S204. If the external factor is frost or shadow masking, proceed to step S203.
[0073] Through step S202, the types of external factors can be further distinguished, and a better step can be selected to sample the to-be-calculated generating power of each solar module system 1.
[0074] In addition, the cleaning error correction method of the solar module of the second embodiment of the present invention can also be the same as the cleaning error correction method of the solar module of the first embodiment, and further includes using an inverter between step S203 and step S204. The step S208 of selecting the generated power of the solar module is also the same as the step S107 in the first embodiment, so the repeated detailed description will be omitted.
[0075] In addition, the error correction method for cleaning solar modules in the second embodiment of the present invention may also be the same as the error correction method for cleaning solar modules in the first embodiment, further including a cleaning step, which is also similar to that in the first embodiment. The cleaning steps are the same, so repeated detailed descriptions are omitted.
[0076] According to the error correction method for cleaning the solar module according to the second embodiment of the present invention, the cleaning time of the solar module can be judged with higher accuracy, and external factors other than dirt and dust can be eliminated, so as to avoid Perform cleaning operations during a short period of time.
[0077] In addition to the above-mentioned reference module 2, evaluation module 3, data collection module 4, display module 5, inverter 6, and cleaning system 7, the solar module system 1 using the cleaning error correction method of the solar module of the present invention can even use this case The invention patent publication No. 201350892 and invention patent publication No. 201414134 proposed by the applicant in Taiwan, China are the solar module performance monitoring system or solar power monitoring system.
