CN103809616B - Be suitable for the control method of the position of sun dual-axis tracking system structure of partly covering - Google Patents

Abstract

A control method for a sun position dual-axis tracking system suitable for partial shading, which belongs to the technical field of photovoltaic power generation, is characterized in that photoresistors are respectively installed at four corners of the upper bracket of a traditional sun position dual-axis tracking system. The control method is: (1) set the initial value; (2) judge whether F _min is reached, if yes, execute (3), if no, return to (2); (3) the initial value of M is "0000", execute (4 ); (4) Judging R ₉ =R ₁₀ , yes, it is "1", no, it is "0", store it in the first bit of M, and execute (5); (5) Judging R ₁₁ =R ₁₂ , yes, If it is "1", if it is no, it is "0", store it in the second bit of M, and execute (6); (6) judge R ₉ =R ₁₁ , if it is yes, it is "1", if it is no, it is "0", and it is stored in For the third bit of M, execute (7); (7) judge R ₁₀ =R ₁₂ , if yes, it is "1", if no, it is "0", store it in the fourth bit of M, and execute (8); (8) get R _min , search for running countermeasures, adjust S _α and S _γ until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ , execute (9); whether (9) △t is over, yes, execute (10); no, Wait, return to (9); (10) judge whether F _end is reached, if yes, the system stops, if not, execute (2).

Description

A control method for the structure of a sun position dual-axis tracking system suitable for partial shading

technical field

The invention belongs to the technical field of solar power generation, and in particular relates to a structure of a photovoltaic dual-axis tracking system and a tracking control method.

Background technique

At present, the development and utilization of renewable energy has been increasingly concerned by the governments of various countries, and the conversion of solar energy into electrical energy through photovoltaics has great potential for development. According to the forecast of the EU Joint Research Center in 2004, by the end of this century, the proportion of photovoltaic power generation in the world's energy supply will exceed 30%. Most of the existing photovoltaic power generation systems use fixed installation of photovoltaic modules. This structure can only ensure that sunlight hits the photovoltaic modules at an optimal angle at a certain time on a certain day of the year, so the utilization rate of sunlight is relatively low. If the photovoltaic module tracks the sun in a dual-axis tracking method, the power generation efficiency of the photovoltaic power generation system can be increased by 30% to 50%. However, most of the existing photovoltaic dual-axis tracking systems (hereinafter referred to as "systems") do not consider the partial shading of the sun (the so-called "partial shading" means that the sun's rays are caused by passing clouds, buildings, trees, etc.) Shading, resulting in inconsistent solar radiation intensity reaching the surface of the photovoltaic module), resulting in poor tracking efficiency of the system and a decrease in the output efficiency of the photovoltaic power generation system. In addition, most of the existing systems only focus on the structure of the system, but do not pay attention to the tracking control method of the system, so the system cannot accurately track the actual sun position. Therefore, it is very necessary to study the control method to provide the structure of the sun position dual-axis tracking system suitable for partial shading.

Contents of the invention

The purpose of the present invention is to install a group of photoresistors on the structure of the two-axis tracking system and provide a control method that can effectively overcome the shortcomings of the prior art.

The present invention is realized like this, as shown in Figure 1, be to comprise upper support 1, connecting support 2, upper stepping motor and worm gear assembly 3, middle support 4, bottom stepping motor and worm assembly 5 , the lower support 6, the data acquisition and control module 7 and the base 8 on the basis of the biaxial tracking sun position structure, the first, second, third and the first are respectively installed on the four corners of its upper support 1 Four photoresistors 9, 10, 11, 12 are characterized in that the control method of the system is: according to the structural accuracy requirements of the photovoltaic biaxial tracking system, the minimum operating angle △ of the system is determined, and the interval time Δt between each operation is determined; Whether the largest resistance value among the four photosensitive 9, 10, 11, 12 is less than the preset value, that is, the system reaches the set value of the minimum solar radiation intensity F _min for operation; no, wait for the minimum solar radiation intensity F _min to be reached; yes, set Set the initial value of a storage unit M as "0000", and perform sequentially on the resistance values R ₉ , R ₁₀ , R ₁₁ , and R ₁₂ in the first, second, third, and fourth photoresistors 9, 10, 11, and 12. Comparison, the order of comparison is: judging R ₉ =R ₁₀ , if yes, record it as "1", if not, record it as "0", store it in the first bit of the storage unit, and enter the next step; judge R ₁₁ =R ₁₂ , if yes, Record as "1", if not, record as "0", store in the second bit of the storage unit, and enter the next step; judge R ₉ =R ₁₁ , if yes, record as "1", if not, record as "0", store in the storage The third bit of the unit, enter the next step; judge R ₁₀ =R ₁₂ , if yes, record it as "1", if not, record it as "0", store it in the fourth position of the storage unit, and enter the next step; get the minimum photoresistance value R _min , enter the following operating conditions, and find the corresponding operating countermeasures:

If the value of the storage unit is "1111", that is, R ₉ =R ₁₀ , R ₁₁ , =R ₁₂ R ₉ =R ₁₁ R ₁₀ =R ₁₂ , it is unshielded, and the altitude angle S _α and azimuth angle S _γ are maintained;

If the value of the storage unit is "1110", that is, R ₉ =R ₁₀ , R ₁₁ , =R ₁₂ R ₉ =R ₁₁ R ₁₀ ≠R ₁₂ , this situation cannot happen;

If the value of the storage unit is "1101", that is, R ₉ =R ₁₀ , R ₁₁ , =R ₁₂ R ₉ ≠R ₁₁ R ₁₀ =R ₁₂ , this situation cannot happen;

If the value of the storage unit is "1100", that is, R ₉ =R ₁₀ , R ₁₁ , =R ₁₂ R ₉ ≠R ₁₁ R ₁₀ ≠R ₁₂ , it means that the lower part of the system is covered. Adjust the height angle S _α in the direction of R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "1011", that is, R ₉ =R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ =R ₁₁ R ₁₀ =R ₁₂ , this situation cannot happen;

If the storage unit value is "1010", that is, R ₉ =R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ =R ₁₁ R ₁₀ ≠R ₁₂ , it means that the fourth photoresistor R ₁₂ is covered, according to the minimum operating angle △ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "1001", that is, R ₉ =R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ ≠R ₁₁ R ₁₀ =R ₁₂ , it means that the third photoresistor R ₁₁ is shaded, according to the minimum operating angle △ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "1000", that is, R ₉ =R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ ≠R ₁₁ R ₁₀ ≠R ₁₂ , it indicates that the lower part of the system is in a complex shielding situation, and the minimum operating angle △ is towards the minimum photosensitive Adjust the height angle S _α in the direction of the resistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "0111", that is, R ₉ ≠R ₁₀ , R ₁₁ , =R ₁₂ R ₉ =R ₁₁ R ₁₀ =R ₁₂ , this situation cannot happen;

If the value of the memory cell is "0110", that is, R ₉ ≠R ₁₀ , R ₁₁ , =R ₁₂ R ₉ =R ₁₁ R ₁₀ ≠R ₁₂ , it means that the second photoresistor R ₁₀ is covered, according to the minimum operating angle △ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "0101", that is, R ₉ ≠ R ₁₀ , R ₁₁ , = R ₁₂ R ₉ ≠ R ₁₁ R ₁₀ = R ₁₂ , it means that the first photoresistor R ₉ is covered, according to the minimum operating angle △ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "0100", that is, R ₉ ≠R ₁₀ , R ₁₁ , =R ₁₂ R ₉ ≠R ₁₁ R ₁₀ ≠R ₁₂ , it indicates that the upper part of the system is in a complex shielding situation, and the minimum operating angle △ is towards the minimum photosensitive Adjust the height angle S _α in the direction of the resistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "0011", that is, R ₉ ≠R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ =R ₁₁ R ₁₀ =R ₁₂ , it means that there is shielding on the left or right side of the system. Adjust the azimuth S _γ in the direction of the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "0010", that is, R ₉ ≠R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ =R ₁₁ R ₁₀ ≠R ₁₂ , it means that the right side of the system is in a complex shielding situation. Adjust the azimuth S _γ in the direction of the photoresistor value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the value of the storage unit is "0001", that is, R ₉ ≠R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ ≠R ₁₁ R ₁₀ =R ₁₂ , it indicates that the left side of the system is in a complex shielding situation, and the minimum running angle △ is moving toward the minimum Adjust the azimuth S _γ in the direction of the photoresistor value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied;

If the storage unit value is "0000", that is, R ₉ ≠R ₁₀ , R ₁₁ , ≠R ₁₂ R ₉ ≠R ₁₁ R ₁₀ ≠R ₁₂ , it means that the system tracking fails. According to the minimum operating angle △, first adjust the altitude angle S _α makes R ₉ =R ₁₁ , R ₁₀ =R ₁₂ , and then adjusts the azimuth S _γ to make R ₉ =R ₁₀ , R ₁₁ =R ₁₂ , that is, R ₉ =R ₁₀ =R ₁₁ =R ₁₂ .

The implementation step of above-mentioned control method is as shown in Figure 2, is:

Step 1. Determine the minimum operating angle △ of the system according to the structural accuracy requirements of the photovoltaic dual-axis tracking system, and determine the interval time △t between each operation;

Step 2. According to the photoresistor, judge whether the minimum solar radiation intensity setting value F _min for system operation is reached, if yes, perform step 3; if no, return to step 2;

Step 3. Set the initial value of a storage unit to "0000", and execute step 4;

Step 4: Determine R ₉ =R ₁₀ , if yes, record it as "1", if not, record it as "0", store it in the first bit of the storage unit M, and execute step 5;

Step 5. Judging that R ₁₁ =R ₁₂ , if yes, record it as "1", if not, record it as "0", store it in the second bit of the storage unit M, and execute step 6;

Step 6. Judging that R ₉ =R ₁₁ , if yes, record it as "1", if not, record it as "0", store it in the third bit of the storage unit M, and execute step 7;

Step 7. Judging that R ₁₀ =R ₁₂ , if yes, record it as "1", if not, record it as "0", store it in the fourth bit of the storage unit M, and execute step 8;

Step 8: Obtain the minimum photoresistor value R _min , enter the running state, find the corresponding running countermeasures according to the value of the storage unit M, and adjust the system altitude S _α and azimuth S _γ until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ , perform step nine

Step 9. Determine whether the running interval time △t is over, if yes, execute step 10; if no, wait for the end of the row interval time △t, and return to step 9;

Step 10. Judging whether the system reaches the solar radiation intensity F _end to stop, if yes, the system stops, if not, return to step 2;

Compared with the prior art, the present invention has the following advantages and positive effects: 1. Compared with the prior art, since the influence of sun shading on the system is considered in the control method, the output efficiency of the system can be improved under the condition of sun shading; The control strategy of looking up the running status table can increase the tracking speed of the system; 3. The structure is simple, the control is convenient, the cost is low, and the cost performance is high.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a flow chart of the control method of the present invention;

Fig. 3 is the comparison chart of the output of the present invention suitable for the partial shading control method and the traditional calculation sun position tracking method;

In the figure: 1—upper bracket, 2—connecting bracket, 3—upper stepping motor and worm gear assembly, 4—middle bracket, 5—lower stepping motor and worm gear assembly, 6—lower bracket, 7—data Acquisition and control module, 8—base, 9, 10, 11, 12—first, second, third and fourth photoresistors.

detailed description

Now the rated power of the selected system stepper motor is 200W, the rated voltage is 50V, and the rated current is 4A. The maximum output power of the photovoltaic modules installed on the system is 1000W, and the gear ratio is 50:1; the selected photoresistor is CdS photosensitive resistance.

Taking Shanghai at 15:00 on September 22, 2013 as an example, the steps of the control method are (1) set the minimum operating angle △ and the interval time △t of each operation to be 0.1° and 5 minutes respectively, and the local longitude and latitude are respectively 121.48° and 31.2°, the longitude of the place where the local standard time is located (i.e. the longitude of Beijing) is 116.4°, execute step (2); (2) the system exceeds the operating minimum solar radiation intensity F _min set value, execute step (3) ;(3) Set the initial value of a storage unit as "0000", and execute step (4); (4) The resistance value of the photoresistor 9, 10, R ₉ ≠ R ₁₀ , is recorded as "0", and stored in the storage For the first bit of unit M, go to step (5); (5) The resistance value of photoresistors 11 and 12, R ₁₁ ≠ R ₁₂ , is recorded as "0", and stored in the second bit of storage unit M, go to step (6) ; (6) The resistance value of the photoresistor 9, 11, R ₉ =R ₁₁ , recorded as "1", stored in the third bit of the storage unit M, and step (7) is performed; (7) The resistance of the photoresistor 10, 12 value, R ₁₀ =R ₁₂ , recorded as "1", stored in the fourth bit of the memory unit M, and step (8) is performed; (8) The minimum photosensitive resistance value R _min =0.05 is obtained, and entered into the operation table, the memory unit M=0011, indicating that there is shelter on the left or right side of the system, adjust the azimuth S _γ =57.9° in the direction of R _min according to △, and keep the altitude S _α =40.07° until the requirements of photoresistors 9, 10, 11, and 12 are met Resistance value, R ₉ =R ₁₀ =R ₁₁ =R ₁₂ ; Execute step (9); (9) The operation interval △t has ended, and execute step (10); (10) The system exceeds the solar radiation intensity F _end of the stop , return to step (2).

Its operating results are compared with the traditional calculation of the sun position tracking method as shown in Figure 3.

Thus, it can be seen that the present invention can improve the tracking accuracy of the system at any time of the day, effectively overcome the influence of the sun being partially shaded, and increase the output power of the photovoltaic power generation system installed on the system.

Claims (1)

1. A control method suitable for a partially shaded sun position biaxial tracking system structure, its structure is to include an upper bracket (1), a connecting bracket (2), an upper stepping motor and a worm gear assembly (3) , the middle bracket (4), the lower stepper motor and worm gear assembly (5), the lower bracket (6), the data acquisition and control module (7) and the base (8) on the basis of the traditional sun position dual-axis tracking system structure , the first, second, third and fourth photoresistors (9-12) are respectively installed on the four corners of the upper support (1), which is characterized in that the control method of the system is: according to the position of the sun double The structural accuracy of the axis tracking system requires determining the minimum operating angle Δ of the system, and determining the interval time Δt between each operation; judging the first, second, third, and fourth photoresistors (9, 10, 11, 12) with the largest resistance value Whether it is less than the preset value, that is, the system reaches the set value of the minimum solar radiation intensity F _min for operation; no, wait until the minimum solar radiation intensity F _min is reached; yes, set the initial value of a storage unit M to "0000", and sequentially set One, the second, the third, the fourth resistance value R ₉ , R ₁₀ , R ₁₁ , R ₁₂ in the photoresistor (9, 10, 11, 12) are compared, and the order of comparison is: judge R ₉ =R ₁₀ , yes, record it as "1", if it is not, record it as "0", store it in the first bit of the storage unit, and go to the next step; judge R ₁₁ =R ₁₂ , if it is, record it as "1", if it is not, record it as "0", Store in the second bit of the storage unit and enter the next step; judge R ₉ =R ₁₁ , if yes, record it as “1” and if not, record it as “0”, store it in the third position of the storage unit, and enter the next step; judge R ₁₀ = R ₁₂ , yes, record as "1", if not, record as "0", store it in the fourth bit of the storage unit, and go to the next step; get the minimum photosensitive resistance value R _min , enter the following operating conditions, and find the corresponding operating countermeasures: If the value of the storage unit is "1111", that is, R ₉ =R ₁₀ , R ₁₁ =R ₁₂ , R ₉ =R ₁₁ , R ₁₀ =R ₁₂ , there is no shielding, and the elevation angle S _α and azimuth angle S _γ are maintained; If the value of the storage unit is "1110", that is, R ₉ =R ₁₀ , R ₁₁ =R ₁₂ , R ₉ =R ₁₁ , R ₁₀ ≠R ₁₂ , this situation cannot happen; If the storage unit value is "1101", that is, R ₉ =R ₁₀ , R ₁₁ =R ₁₂ , R ₉ ≠R ₁₁ , R ₁₀ =R ₁₂ , this situation cannot happen; If the value of the storage unit is "1100", that is, R ₉ = R ₁₀ , R ₁₁ = R ₁₂ , R ₉ ≠ R ₁₁ , R ₁₀ ≠ R ₁₂ , it means that the lower part of the system is covered, and according to the minimum operating angle Δ toward the minimum photoresistor value Adjust the height angle S _α in the direction of R _min until R ₉ ＝ R ₁₀ ＝ R ₁₁ ＝ R ₁₂ ; If the value of the storage unit is "1011", that is, R ₉ =R ₁₀ , R ₁₁ ≠R ₁₂ , R ₉ =R ₁₁ , R ₁₀ =R ₁₂ , this situation cannot happen; If the value of the storage unit is "1010", that is, R ₉ =R ₁₀ , R ₁₁ ≠R ₁₂ , R ₉ =R ₁₁ , R ₁₀ ≠R ₁₂ , it means that the fourth photoresistor R ₁₂ is covered. According to the minimum operating angle Δ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the value of the storage unit is "1001", that is, R ₉ =R ₁₀ , R ₁₁ ≠R ₁₂ , R ₉ ≠R ₁₁ , R ₁₀ =R ₁₂ , it means that the third photoresistor R ₁₁ is covered, and according to the minimum operating angle Δ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the value of the storage unit is "1000", that is, R ₉ =R ₁₀ , R ₁₁ ≠R ₁₂ , R ₉ ≠R ₁₁ , R ₁₀ ≠R ₁₂ , it indicates that the lower part of the system is in a complicated shielding situation, and the minimum photosensitive Adjust the height angle S _α in the direction of the resistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the value of the storage unit is "0111", that is, R ₉ ≠R ₁₀ , R ₁₁ =R ₁₂ , R ₉ =R ₁₁ , R ₁₀ =R ₁₂ , this situation cannot happen; If the value of the storage unit is "0110", that is, R ₉ ≠ R ₁₀ , R ₁₁ = R ₁₂ , R ₉ = R ₁₁ , R ₁₀ ≠ R ₁₂ , it means that the second photoresistor R ₁₀ is covered, and according to the minimum operating angle Δ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the value of the storage unit is "0101", that is, R ₉ ≠ R ₁₀ , R ₁₁ = R ₁₂ , R ₉ ≠ R ₁₁ , R ₁₀ = R ₁₂ , it means that the first photoresistor R ₉ is covered, and according to the minimum operating angle Δ Adjust the azimuth S _γ towards the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the value of the storage unit is "0100", that is, R ₉ ≠ R ₁₀ , R ₁₁ = R ₁₂ , R ₉ ≠ R ₁₁ , R ₁₀ ≠ R ₁₂ , it indicates that the upper part of the system is in a complex shielding situation, and the minimum photosensitive Adjust the height angle S _α in the direction of the resistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the storage unit value is "0011", that is, R ₉ ≠ R ₁₀ , R ₁₁ ≠ R ₁₂ , R ₉ = R ₁₁ , R ₁₀ = R ₁₂ , it means that there is shielding on the left or right side of the system. Adjust the azimuth S _γ in the direction of the minimum photoresistance value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the value of the storage unit is "0010", that is, R ₉ ≠ R ₁₀ , R ₁₁ ≠ R ₁₂ , R ₉ = R ₁₁ , R ₁₀ ≠ R ₁₂ , it means that the right side of the system is in a complicated shielding situation. Adjust the azimuth S _γ in the direction of the photoresistor value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the value of the storage unit is "0001", that is, R ₉ ≠ R ₁₀ , R ₁₁ ≠ R ₁₂ , R ₉ ≠ R ₁₁ , R ₁₀ = R ₁₂ , it means that the left side of the system is in a complicated shielding situation. Adjust the azimuth S _γ in the direction of the photoresistor value R _min until R ₉ =R ₁₀ =R ₁₁ =R ₁₂ is satisfied; If the storage unit value is "0000", that is, R ₉ ≠ R ₁₀ , R ₁₁ ≠ R ₁₂ , R ₉ ≠ R ₁₁ , R ₁₀ ≠ R ₁₂ , it means that the system tracking fails. According to the minimum operating angle Δ, first adjust the altitude angle S _α makes R ₉ ＝R ₁₁ , R ₁₀ ＝R ₁₂ , and then adjusts the azimuth S _γ to make R ₉ ＝R ₁₀ , R ₁₁ ＝R ₁₂ , that is, R ₉ ＝R ₁₀ ＝R ₁₁ ＝R ₁₂ ; The implementation steps of above-mentioned control method are: Step 1. Determine the minimum operating angle Δ of the system according to the structural accuracy requirements of the sun position dual-axis tracking system, and determine the interval time Δt between each operation; Step 2. According to the photoresistor, judge whether the minimum solar radiation intensity setting value F _min for system operation is reached, if yes, perform step 3; if no, return to step 2; Step 3. Set the initial value of a storage unit to "0000", and execute step 4; Step 4. Determine R ₉ =R ₁₀ , if yes, record it as "1", if not, record it as "0", store it in the first bit of the storage unit M, and execute step 5; Step 5. Judging that R ₁₁ =R ₁₂ , if yes, record it as "1", if not, record it as "0", store it in the second bit of the storage unit M, and execute step 6; Step 6. Judging that R ₉ =R ₁₁ , if yes, record it as "1", if not, record it as "0", store it in the third bit of the storage unit M, and execute step 7; Step 7. Determine R ₁₀ =R ₁₂ , if yes, record it as "1", if no, record it as "0", store it in the fourth bit of the storage unit M, and execute step 8; Step 8: Obtain the minimum photoresistor value R _min , enter the running state, find the corresponding running countermeasures according to the value of the storage unit M, and adjust the system altitude S _α and azimuth S _γ until R ₉ ＝R ₁₀ ＝R ₁₁ ＝R ₁₂ , execute step nine; Step 9. Determine whether the running interval time Δt is over, if yes, execute step 10; if not, wait for the running interval time Δt to end, and return to step 9; Step 10: Judging whether the system reaches the solar radiation intensity F _end to stop, if yes, the system stops, if not, go back to step 2.