Angle adjustment method of photovoltaic tracking bracket and photovoltaic equipment

Abstract

The present invention provides an angle adjustment method for a photovoltaic tracking bracket, comprising: determining the remaining power of a battery, and determining the low performance critical value and protection angle of the battery based on current meteorological conditions; when the remaining power is higher than the preset protection critical value, adjusting the rotation angle of the photovoltaic tracking bracket based on the illumination direction; when the remaining power is not higher than the preset protection critical value and higher than the low performance critical value, adjusting the rotation angle of the photovoltaic tracking bracket based on the illumination direction, and reducing the angle between the incident light direction and the illumination direction of the photovoltaic cell while keeping the difference between the rotation angle and the protection angle of the photovoltaic tracking bracket not exceeding the preset angle; when the remaining power is not higher than the low performance critical value, controlling the photovoltaic tracking bracket to rotate to the protection angle. The method provided by the present invention can ensure that the remaining power of the battery is sufficient to adjust the photovoltaic tracking bracket to the protection angle while ensuring the efficiency of photovoltaic power generation. The present invention also provides a photovoltaic device.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor process equipment, and in particular to a method for adjusting the angle of a photovoltaic tracking bracket and a photovoltaic device comprising the photovoltaic tracking bracket. Background Art

[0002] To ensure the efficiency of photovoltaic power generation, existing photovoltaic power generation equipment often uses photovoltaic tracking brackets to support photovoltaic cells. The photovoltaic tracking brackets are driven by motors to achieve angle rotation, thereby ensuring that the light-entering surface of the photovoltaic cells always faces the sun. Common motor drive methods include mains power supply, small component power supply + battery power supply, string power supply + battery power supply, etc. Among them, mains power supply does not need to worry about power shortage, but it needs to lay power supply cables, resulting in higher equipment costs. The other two methods both have batteries.

[0003] However, when using batteries to power photovoltaic tracking brackets, the photovoltaic cells often generate insufficient power, resulting in insufficient remaining battery power for the photovoltaic tracking bracket to rotate. When encountering extreme weather, it is difficult to ensure that the photovoltaic tracking bracket rotates to a safe angle to protect fragile components such as photovoltaic cells, which leads to poor safety and reliability of photovoltaic power generation equipment.

[0004] Therefore, how to ensure the safety of photovoltaic tracking brackets while improving the efficiency of photovoltaic power generation has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The present invention aims to provide an angle adjustment method for a photovoltaic tracking bracket and a photovoltaic device including the photovoltaic tracking bracket. The angle adjustment method for the photovoltaic tracking bracket can improve the efficiency of photovoltaic power generation while ensuring the safety of the photovoltaic tracking bracket.

[0006] To achieve the above object, as one aspect of the present invention, a method for adjusting the angle of a photovoltaic tracking bracket is provided, the method comprising:

[0007] Determine the remaining power of the battery, and determine the low performance critical value of the battery and the protection angle corresponding to the current meteorological conditions based on the current meteorological conditions;

[0008] When the remaining power is higher than a preset protection critical value, adjusting the rotation angle of the photovoltaic tracking bracket based on the illumination direction so that the light incident surface of the photovoltaic cell faces the illumination direction;

[0009] When the remaining power is not higher than the preset protection critical value and higher than the low performance critical value, the rotation angle of the photovoltaic tracking bracket is adjusted based on the illumination direction, so as to reduce the angle between the incident light direction of the photovoltaic cell and the illumination direction while keeping the difference between the rotation angle and the protection angle of the photovoltaic tracking bracket not exceeding the preset angle;

[0010] When the remaining power is not higher than the low performance critical value, controlling the photovoltaic tracking bracket to rotate to the protection angle;

[0011] The low performance critical value corresponds to the energy required to drive the photovoltaic tracking bracket to rotate to the protection angle under current meteorological conditions, and the preset protection critical value is greater than the low performance critical value.

[0012] Optionally, the determining the remaining power of the battery specifically includes:

[0013] The charging current and the discharging current of the battery are integrated to obtain the amount of change in the amount of charge of the battery, and the remaining amount of charge of the battery is determined according to the initial amount of charge of the battery and the amount of change in the amount of charge.

[0014] Optionally, integrating the charging current and discharging current of the battery to obtain the amount of change in the amount of electricity of the battery specifically includes:

[0015] Sampling the charging current or discharging current of the battery in a plurality of consecutive time periods to obtain the charging current or discharging current corresponding to each time period;

[0016] The charging current or discharging current corresponding to each time period is multiplied by the length of each time period, and a plurality of results are summed to obtain the amount of change in the battery power.

[0017] Optionally, the determining the remaining power of the battery specifically includes:

[0018] Based on calculation Determining the remaining power of the battery;

[0019] Wherein, SOC is the remaining capacity of the battery, SOC0 is the initial capacity of the battery, δ is the charge and discharge efficiency of the battery, C E is the rated capacity of the battery, I is the charging current or discharging current of the battery, It is the time integral of the charging current or discharging current of the battery.

[0020] Optionally, the method further comprises:

[0021] When the charging power and the discharging power of the storage battery are both lower than the preset power threshold within the preset time threshold, obtaining the voltage value between the positive electrode and the negative electrode of the storage battery, and determining the remaining power correction value of the storage battery according to the voltage value;

[0022] When the difference between the remaining power of the storage battery and the remaining power correction value is greater than a preset difference threshold, the remaining power correction value is determined as the current remaining power of the storage battery.

[0023] Optionally, the obtaining of a voltage value between a positive electrode and a negative electrode of the battery, and determining a power correction value of the battery according to the voltage value, specifically includes:

[0024] Determining a current temperature value of the battery;

[0025] The remaining power correction value of the battery is determined according to the corresponding relationship between the remaining power corresponding to the current temperature value of the battery and the charging and discharging voltage value of the battery, and the voltage value between the positive and negative electrodes of the battery.

[0026] Optionally, the photovoltaic tracking bracket is driven by a motor, and determines the low performance critical value of the battery based on current meteorological conditions, specifically including:

[0027] Determine the basic motor power of the motor driving the photovoltaic tracking bracket to rotate based on the current angle of the photovoltaic tracking bracket, and determine the weather correction coefficient based on the current meteorological conditions;

[0028] Based on the basic motor power, the weather correction factor and the time required to drive the photovoltaic tracking bracket to rotate a unit angle, the driving energy required to drive the photovoltaic tracking bracket from the current angle to the protection angle is determined, and the low performance critical value is determined based on the driving energy.

[0029] Optionally, determining the protection angle corresponding to the current meteorological condition based on the current meteorological condition specifically includes:

[0030] When the wind speed is higher than the preset wind speed threshold, the preset high wind protection angle is determined as the protection angle corresponding to the current meteorological conditions; when the wind speed is not higher than the preset wind speed threshold and the snow thickness is higher than the preset snow thickness threshold, the preset heavy snow protection angle is determined as the protection angle corresponding to the current meteorological conditions.

[0031] Optionally, when the wind speed is not higher than the preset wind speed threshold, the snow thickness is not higher than the preset snow thickness threshold and the hail parameter is higher than the preset hail threshold, the preset hail protection angle is determined as the protection angle corresponding to the current meteorological conditions.

[0032] As a second aspect of the present invention, a photovoltaic device is provided, comprising a control device, a storage battery, a photovoltaic cell, a photovoltaic tracking bracket and a bracket driving device, wherein the photovoltaic cell is arranged on the photovoltaic tracking bracket, the bracket driving device is used to drive the photovoltaic tracking bracket to drive the photovoltaic cell to rotate, the storage battery is used to store the electrical energy generated by the photovoltaic cell, and the control device is used to execute the angle adjustment method of the photovoltaic tracking bracket described above.

[0033] Optionally, the control device stores a correspondence between the remaining power of the battery and the charge and discharge voltage value of the battery when the charge and discharge power of the battery is lower than a preset power threshold at different temperatures;

[0034] The control device is used to integrate the charging current and the discharging current of the battery to obtain the amount of change in the amount of electricity of the battery, and determine the remaining amount of electricity of the battery according to the initial amount of electricity of the battery and the amount of change in electricity;

[0035] It is also used to obtain the voltage value between the positive and negative electrodes of the battery and the current temperature value of the battery when the charging power and the discharging power of the battery are both lower than the preset power threshold within the preset time threshold, and determine the remaining power correction value of the battery according to the corresponding relationship between the remaining power corresponding to the voltage value and the current temperature value and the charging and discharging voltage value of the battery; when the difference between the remaining power of the battery and the remaining power correction value is greater than the preset difference threshold, determine the remaining power correction value as the current remaining power of the battery.

[0036] Optionally, the control device includes a control module, a battery management module, a power module and a motor drive module, wherein:

[0037] The control module is used to execute the angle adjustment method of the photovoltaic tracking bracket;

[0038] The battery management module is connected between the battery and the control module, and is used to supply power to the control module and the power module and obtain the charging current, discharging current, and charging and discharging voltage of the battery;

[0039] The power supply module is used to output the electric energy generated by the photovoltaic cell to the motor drive module, output the electric energy generated by the photovoltaic cell to the storage battery through the battery management module, or output the electric energy stored in the storage battery to the motor drive module;

[0040] The motor driving module is used to drive the motor to drive the photovoltaic tracking bracket to rotate.

[0041] Optionally, the control device further comprises a communication module, and the control module is further configured to receive a control signal through the communication module to determine the low performance critical value and the protection angle.

[0042] Optionally, the photovoltaic device further includes a tilt sensor, and the control device is used to adjust the rotation angle of the photovoltaic tracking bracket based on tilt feedback information of the tilt sensor.

[0043] The angle adjustment method of the photovoltaic tracking bracket provided by the present invention can determine the low-performance critical value corresponding to the energy required to drive the photovoltaic tracking bracket to rotate to the protection angle based on the current meteorological conditions, and control the photovoltaic tracking bracket to rotate to the protection angle when the remaining power of the battery is not higher than the low-performance critical value, so as to prevent the remaining power of the battery from being insufficient to support the photovoltaic tracking bracket to reach the protection angle; and, when the remaining power is higher than the low-performance critical value but not higher than the preset protection critical value, the angle between the rotation angle of the photovoltaic tracking bracket and the protection angle is kept not exceeding the preset angle, that is, the photovoltaic tracking bracket is not allowed to exceed the range of the rotation angle minus the preset angle to the rotation angle plus the preset angle when tracking the direction of light, thereby avoiding that the rotation angle of the photovoltaic tracking bracket is too large with the protection angle when the battery power is insufficient, resulting in the inability to drive the photovoltaic tracking bracket to rotate to the protection angle when entering the protection state, and only when the remaining power is higher than the preset protection critical value, the photovoltaic tracking bracket is allowed to rotate to any angle, so as to maximize the power generation efficiency of the photovoltaic cell.

[0044] The angle adjustment method of the photovoltaic tracking bracket provided by the present invention can control the photovoltaic tracking bracket to follow the direction of light, and at the same time, limit the angle of the photovoltaic tracking bracket to near the protection angle when the remaining power of the battery is low, or directly control the rotation of the photovoltaic tracking bracket to the protection angle, thereby ensuring the power generation efficiency of the photovoltaic cell while ensuring that the remaining power of the battery is sufficient to adjust the photovoltaic tracking bracket to the protection angle, thereby ensuring the safety and reliability of the photovoltaic tracking bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0046] Figure 1 It is a schematic flow chart of the angle adjustment method of the photovoltaic tracking bracket provided by an embodiment of the present invention;

[0047] Figure 2 It is a schematic diagram of the corresponding relationship between the remaining power of the battery and the parallel voltage when the battery is discharged at a low power at room temperature;

[0048] Figure 3It is a schematic diagram of the corresponding relationship between the parallel voltage value and the battery temperature when the battery is discharged at a low power under different residual power conditions;

[0049] Figure 4 It is a schematic diagram of the changes of the motor current and the angle of the photovoltaic tracking bracket over time when the motor drives the photovoltaic tracking bracket to rotate;

[0050] Figure 5 It is a schematic diagram of the structure of a control device in a photovoltaic device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0052] In order to solve the above technical problems, as one aspect of the present invention, a method for adjusting the angle of a photovoltaic tracking bracket is provided, such as Figure 1 As shown, the method includes:

[0053] Determine the remaining power (State of Charge, SOC) of the battery, and determine the low performance critical value X of the battery and the protection angle corresponding to the current meteorological conditions based on the current meteorological conditions;

[0054] When the remaining power is higher than a preset protection threshold value Y, the rotation angle of the photovoltaic tracking bracket is adjusted based on the illumination direction so that the light incident surface of the photovoltaic cell faces the illumination direction;

[0055] When the remaining power is not higher than the preset protection critical value Y and higher than the low performance critical value X, the rotation angle of the photovoltaic tracking bracket is adjusted based on the illumination direction, so as to reduce the angle between the incident light direction of the photovoltaic cell and the illumination direction while keeping the difference between the rotation angle and the protection angle of the photovoltaic tracking bracket not exceeding the preset angle;

[0056] When the remaining power is not higher than the low performance critical value X, controlling the photovoltaic tracking bracket to rotate to the protection angle;

[0057] The low performance critical value X corresponds to the energy required to drive the photovoltaic tracking bracket to rotate to the protection angle under current meteorological conditions, and the preset protection critical value Y is greater than the low performance critical value X.

[0058] It should be noted that the same photovoltaic cell has different corresponding protection angles under different meteorological conditions. For example, in windy weather, some tracking bracket structures need to be laid flat as much as possible to reduce the impact of wind resistance, that is, the protection angle in windy weather may be 0° with the horizontal plane. In snowy weather, in order to avoid the photovoltaic cell surface being covered with too much snow, the photovoltaic cell should not be laid flat, that is, the protection angle in snowy weather cannot be 0° with the horizontal plane. Therefore, the current protection angle needs to be determined according to meteorological conditions. The illumination direction refers to the direction with the highest illumination intensity. For example, the direction toward the sun on a sunny day is the illumination direction.

[0059] The angle adjustment method of the photovoltaic tracking bracket provided by the present invention can determine the low performance critical value X corresponding to the energy required to drive the photovoltaic tracking bracket to rotate to the protection angle based on the current meteorological conditions, and when the remaining power of the battery is not higher than the low performance critical value X, control the photovoltaic tracking bracket to rotate to the protection angle, so as to prevent the remaining power of the battery from being insufficient to support the photovoltaic tracking bracket to reach the protection angle; and when the remaining power is higher than the low performance critical value X but not higher than the preset protection critical value Y, keep the angle between the rotation angle of the photovoltaic tracking bracket and the protection angle not exceeding the preset angle, that is, the photovoltaic tracking bracket is not allowed to exceed the range of the rotation angle minus the preset angle to the rotation angle plus the preset angle when tracking the direction of light, so as to avoid the photovoltaic tracking bracket being unable to drive the photovoltaic tracking bracket to rotate to the protection angle when entering the protection state due to the rotation angle of the photovoltaic tracking bracket being too large with the protection angle when the battery power is insufficient, and only allow the photovoltaic tracking bracket to rotate to any angle when the remaining power is higher than the preset protection critical value Y, so as to maximize the power generation efficiency of the photovoltaic cell.

[0060] The angle adjustment method of the photovoltaic tracking bracket provided by the present invention can control the photovoltaic tracking bracket to follow the direction of light, and at the same time, limit the angle of the photovoltaic tracking bracket to near the protection angle when the remaining power of the battery is low, or directly control the rotation of the photovoltaic tracking bracket to the protection angle, thereby ensuring the power generation efficiency of the photovoltaic cell while ensuring that the remaining power of the battery is sufficient to adjust the photovoltaic tracking bracket to the protection angle, thereby ensuring the safety and reliability of the photovoltaic tracking bracket.

[0061] As an optional implementation manner of the present invention, the preset protection threshold value Y may be 50%.

[0062] As an optional implementation manner of the present invention, the remaining power of the battery can be determined by an ampere-hour integration method. Specifically, the determining the remaining power of the battery includes:

[0063] The charging current and the discharging current (i.e., the charging and discharging current) of the battery are integrated to obtain the change in the amount of charge of the battery, and the remaining amount of charge of the battery is determined based on the initial amount of charge of the battery and the change in the amount of charge.

[0064] As an optional implementation manner of the present invention, the determining the remaining power of the battery may specifically include:

[0065] Based on calculation Determining the remaining power of the battery;

[0066] Wherein, SOC is the remaining capacity of the battery, SOC0 is the initial capacity of the battery, δ is the charge and discharge efficiency of the battery, C E is the rated capacity of the battery, I is the charging current or discharging current of the battery, It is the time integral of the charging current or discharging current of the battery.

[0067] In order to reduce the amount of data calculation of the control module, as a preferred embodiment of the present invention, time segment calculation can be used when integrating the charging and discharging current of the battery. Specifically, the charging current and the discharging current of the battery are integrated to obtain the amount of change of the battery power, which specifically includes:

[0068] Sampling the charging current or discharging current of the battery in a plurality of consecutive time periods to obtain the charging current or discharging current corresponding to each time period;

[0069] The charging current or discharging current corresponding to each time period is multiplied by the length of each time period, and a plurality of results are summed to obtain the amount of change in the battery power.

[0070] That is, the embodiment of the present invention divides the time into segments, collects the instantaneous current value in each time period as the charge and discharge current of the time period, and multiplies the charge and discharge current of each time period by the length of the time period, and finally sums up multiple products to obtain the amount of power change. In the embodiment of the present invention, a single instantaneous current value in each time period replaces the current data that changes continuously in the time period, thereby reducing the amount of data calculation of the control module and saving the computing power of the control module.

[0071] In order to improve the accuracy of the remaining power data, as a preferred embodiment of the present invention, the method further includes:

[0072] When the charging power and the discharging power of the storage battery are both lower than the preset power threshold within the preset time threshold, obtaining the voltage value between the positive electrode and the negative electrode of the storage battery, and determining the remaining power correction value of the storage battery according to the voltage value;

[0073] When the difference between the remaining power of the storage battery and the remaining power correction value is greater than a preset difference threshold, the remaining power correction value is determined as the current remaining power of the storage battery.

[0074] like Figure 1 The figure shows a schematic diagram of the change of the parallel voltage between the positive electrode and the negative electrode when the battery is discharged at low power (i.e., when the discharge power is lower than the preset power threshold) corresponding to the residual power of the battery decreasing from 100% to 0% at room temperature. It can be seen from the image that there is a linear correlation between the parallel voltage value of the battery when it is discharged at low power and the magnitude of its residual power. Therefore, in the embodiment of the present invention, the parallel voltage between the two electrodes of the battery when it is discharged at low power (generally when it is dark) is used to determine the residual power correction value (i.e., the residual power value corresponding to the current parallel voltage in the curve), and when the difference between the residual power of the battery (obtained by the ampere-hour integration method) and the residual power correction value (obtained by the low-power discharge method) is greater than the preset difference threshold, the residual power correction value obtained by the low-power discharge method is used as a reference to calibrate the residual power, so as to avoid the error accumulated by long-term integral calculation affecting the accuracy of the residual power, thereby ensuring the data accuracy of the residual power, and further ensuring the safety of the photovoltaic tracking bracket.

[0075] To further ensure the data accuracy of the remaining power, as a preferred embodiment of the present invention, obtaining the voltage value between the positive electrode and the negative electrode of the battery, and determining the power correction value of the battery according to the voltage value specifically includes:

[0076] Determining a current temperature value of the battery;

[0077] The remaining power correction value of the battery is determined based on the corresponding relationship between the remaining power corresponding to the current temperature value of the battery and the charging and discharging voltage value of the battery, and the voltage value between the positive and negative electrodes of the battery (ie, the parallel voltage).

[0078] like Figure 3 As shown, when the battery is discharged at a low power, the parallel voltage value is not only related to the remaining power of the battery, but also to the ambient temperature of the battery. Therefore, in the embodiment of the present invention, the current temperature value of the battery is first determined, and then the remaining power correction value of the battery is determined according to the corresponding relationship between the remaining power corresponding to the current temperature value of the battery and the parallel voltage, thereby further ensuring the data accuracy of the remaining power.

[0079] In order to further ensure the safety of components such as the photovoltaic tracking bracket, as a preferred embodiment of the present invention, the photovoltaic tracking bracket is driven by a motor, and the low performance critical value X of the battery is determined based on the current meteorological conditions, specifically including:

[0080] Determine the basic motor power of the motor driving the photovoltaic tracking bracket to rotate based on the current angle of the photovoltaic tracking bracket, and determine the weather correction coefficient based on the current meteorological conditions;

[0081] Based on the basic motor power, the weather correction factor and the time required to drive the photovoltaic tracking bracket to rotate a unit angle, the driving energy required to drive the photovoltaic tracking bracket to rotate from the current angle to the protection angle is determined, and the low performance critical value X is determined based on the driving energy.

[0082] like Figure 4 The figure shows the change of motor current and angle of the photovoltaic tracking bracket with time when the photovoltaic tracking bracket is driven by the motor. The horizontal axis in the figure is time, the histogram data is the motor current, and the curve data is the angle of the photovoltaic tracking bracket. It can be seen from the image that when the photovoltaic tracking bracket is at different angles, the current driven by the motor to rotate the photovoltaic tracking bracket is also different, that is, the corresponding required basic motor power is different, and the time required for the motor to drive the photovoltaic tracking bracket to rotate per unit angle is also different.

[0083] Therefore, under normal weather conditions, the electric energy required for the photovoltaic tracking bracket to rotate per unit angle (for example, 1°) is equal to the product of the basic motor power and the time required for the photovoltaic tracking bracket to rotate per unit angle, where the basic motor power and the time required for the photovoltaic tracking bracket to rotate per unit angle are both determined based on the current angle of the photovoltaic tracking bracket. In addition, taking into account the impact of extreme weather (for example, the load increases when driving the photovoltaic tracking bracket to rotate in windy weather, so the calculated value of energy consumption should be corrected to increase), the electric energy required for the photovoltaic tracking bracket to rotate per unit angle must also be corrected by a weather correction coefficient (greater than 1) determined based on current meteorological conditions.

[0084] That is, under the current meteorological conditions, the electric energy required for the photovoltaic tracking bracket to rotate per unit angle is equal to the product of the basic motor power, the time required for the photovoltaic tracking bracket to rotate per unit angle, and the weather correction coefficient corresponding to the current meteorological conditions.

[0085] As an optional implementation manner of the present invention, the meteorological conditions may include strong winds and heavy snow. Specifically, determining the protection angle corresponding to the current meteorological conditions based on the current meteorological conditions specifically includes:

[0086] When the wind speed is higher than the preset wind speed threshold (i.e. strong wind weather), the preset strong wind protection angle (for example, it can be an angle of 0° with the horizontal plane) is determined as the protection angle corresponding to the current meteorological conditions; when the wind speed is not higher than the preset wind speed threshold and the snow thickness is higher than the preset snow thickness threshold (i.e. heavy snow weather), the preset heavy snow protection angle (for example, it can be perpendicular to the horizontal plane) is determined as the protection angle corresponding to the current meteorological conditions.

[0087] Taking into account that strong winds are more harmful to the photovoltaic tracking bracket than heavy snow, the priority of strong winds is set higher than that of heavy snow in the embodiment of the present invention. Therefore, when strong winds and heavy snow exist at the same time, the rotation angle of the photovoltaic tracking bracket is adjusted to the preset strong wind protection angle. When only heavy snow exists but no strong winds, the rotation angle of the photovoltaic tracking bracket is adjusted to the preset heavy snow protection angle. This ensures that the photovoltaic tracking bracket can always be rotated to the protection angle that can best ensure its safety.

[0088] As an optional implementation of the present invention, meteorological conditions may also include hail weather, and the priority of hail weather is set lower than that of heavy snow weather. Specifically, when the wind speed is not higher than the preset wind speed threshold, the snow thickness is not higher than the preset snow thickness threshold and the hail parameter is higher than the preset hail threshold, the preset hail protection angle is determined as the protection angle corresponding to the current meteorological condition.

[0089] As a second aspect of the present invention, a photovoltaic device is provided, including a control device, a storage battery, a photovoltaic cell, a photovoltaic tracking bracket and a bracket driving device, wherein the photovoltaic cell is arranged on the photovoltaic tracking bracket, the bracket driving device is used to drive the photovoltaic tracking bracket to drive the photovoltaic cell to rotate, the storage battery is used to store the electrical energy generated by the photovoltaic cell, and the control device is used to execute the angle adjustment method of the photovoltaic tracking bracket provided in an embodiment of the present invention.

[0090] In the photovoltaic device provided by the present invention, the control device can determine the low performance critical value X corresponding to the energy required to drive the photovoltaic tracking bracket to rotate to the protection angle based on the current meteorological conditions, and control the photovoltaic tracking bracket to rotate to the protection angle when the remaining power of the battery is not higher than the low performance critical value X, so as to prevent the remaining power of the battery from being insufficient to support the photovoltaic tracking bracket to reach the protection angle; and when the remaining power is higher than the low performance critical value X but not higher than the preset protection critical value Y, the angle between the rotation angle of the photovoltaic tracking bracket and the protection angle is kept not exceeding the preset angle, that is, the photovoltaic tracking bracket is not allowed to exceed the range of the rotation angle minus the preset angle to the rotation angle plus the preset angle when tracking the direction of light, thereby avoiding that the rotation angle of the photovoltaic tracking bracket is too large with the protection angle when the battery power is insufficient, resulting in the inability to drive the photovoltaic tracking bracket to rotate to the protection angle when entering the protection state, and only when the remaining power is higher than the preset protection critical value Y, the photovoltaic tracking bracket is allowed to rotate to any angle, so as to maximize the power generation efficiency of the photovoltaic cell.

[0091] The photovoltaic device provided by the present invention can control the photovoltaic tracking bracket to follow the direction of light, and at the same time, limit the angle of the photovoltaic tracking bracket to near the protection angle or directly control the rotation of the photovoltaic tracking bracket to the protection angle when the remaining power of the battery is low. Therefore, while ensuring the power generation efficiency of the photovoltaic cell, it is ensured that the remaining power of the battery is sufficient to adjust the photovoltaic tracking bracket to the protection angle, thereby ensuring the safety and reliability of the photovoltaic tracking bracket.

[0092] As an optional implementation manner of the present invention, the control device may be a tracking controller (Tracker Control Unit, TCU).

[0093] As an optional implementation manner of the present invention, the control device stores a correspondence between the remaining power of the battery and the charge and discharge voltage value of the battery when the charge and discharge power of the battery is lower than a preset power threshold at different temperatures;

[0094] The control device is used to integrate the charging current and the discharging current of the battery to obtain the amount of change in the amount of electricity of the battery, and determine the remaining amount of electricity of the battery according to the initial amount of electricity of the battery and the amount of change in electricity;

[0095] It is also used to obtain the voltage value between the positive and negative electrodes of the battery and the current temperature value of the battery when the charging power and the discharging power of the battery are both lower than the preset power threshold within the preset time threshold, and determine the remaining power correction value of the battery according to the corresponding relationship between the remaining power corresponding to the voltage value and the current temperature value and the charging and discharging voltage value of the battery; when the difference between the remaining power of the battery and the remaining power correction value is greater than the preset difference threshold, determine the remaining power correction value as the current remaining power of the battery.

[0096] like Figure 3 As shown, the parallel voltage value of the battery during low-power discharge is not only related to the remaining power of the battery, but also to the ambient temperature of the battery. Therefore, in the control device of the embodiment of the present invention, the corresponding relationship between the remaining power of the battery during low-power discharge and the charge and discharge voltage values ​​at different temperatures is pre-stored. When correcting the remaining power, the current temperature value of the battery is first determined, and then the remaining power correction value of the battery is determined according to the corresponding relationship between the remaining power corresponding to the current temperature value of the battery and the parallel voltage, thereby ensuring the data accuracy of the remaining power.

[0097] As an optional embodiment of the present invention, Figure 5 As shown, the control device includes a control module 100, a battery management module 103, a power module 102 and a motor 120 drive module 101, wherein:

[0098] The control module 100 is used to execute the angle adjustment method of the photovoltaic tracking bracket;

[0099] The battery management module 103 is connected between the battery 140 and the control module 100, and is used to supply power to the control module 100 and the power module 102 and obtain the charging current, discharging current, and charging and discharging voltage of the battery 140;

[0100] The power supply module 102 is used to output the electric energy generated by the photovoltaic cell 130 to the motor 120 driving module 101, output the electric energy generated by the photovoltaic cell 130 to the storage battery 140 through the battery management module 103, or output the electric energy stored in the storage battery 140 to the motor 120 driving module 101;

[0101] The motor 120 driving module 101 is used to drive the motor 120 to drive the photovoltaic tracking bracket to rotate.

[0102] As an optional embodiment of the present invention, Figure 5 As shown, the control device also includes a communication module 104, and the control module 100 is also used to receive a control signal through the communication module 104 to determine the low performance critical value X and the protection angle, that is, the photovoltaic device can receive instructions from the staff or the automatic control system through the communication module 104 at any time during use to change its pre-stored parameter information (such as resetting the protection angle), thereby improving the convenience of adjusting the working state of the photovoltaic device.

[0103] As an optional embodiment of the present invention, Figure 5 As shown, the photovoltaic device further includes a tilt sensor 110 , and the control device is used to adjust the rotation angle of the photovoltaic tracking bracket based on the tilt feedback information of the tilt sensor 110 .

[0104] As a third aspect of the present invention, a photovoltaic system is provided, including a communication controller (Network Control Unit, NCU) and multiple photovoltaic devices provided by embodiments of the present invention, wherein the photovoltaic devices include a communication module 104, and the communication controller is communicatively connected to the communication modules 104 of the multiple photovoltaic devices.

[0105] In the photovoltaic system provided by the present invention, the photovoltaic equipment can control the photovoltaic tracking bracket to follow the direction of light, and at the same time, limit the angle of the photovoltaic tracking bracket to near the protection angle or directly control the rotation of the photovoltaic tracking bracket to the protection angle when the remaining power of the battery is low. Therefore, while ensuring the power generation efficiency of the photovoltaic cell, it is ensured that the remaining power of the battery is sufficient to adjust the photovoltaic tracking bracket to the protection angle, thereby ensuring the safety and reliability of the photovoltaic tracking bracket.

[0106] Furthermore, the communication controller can simultaneously send control instructions (such as control instructions for resetting the protection angle) to multiple photovoltaic devices in the photovoltaic system, thereby improving the convenience of adjusting the working status of multiple photovoltaic devices.

[0107] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for adjusting the angle of a photovoltaic tracking bracket, characterized in that: The method comprises: Determine the remaining power of the battery, and determine the low performance critical value of the battery and the protection angle corresponding to the current meteorological conditions based on the current meteorological conditions; When the remaining power is higher than a preset protection critical value, the rotation angle of the photovoltaic tracking bracket is adjusted based on the illumination direction so that the light incident surface of the photovoltaic cell faces the illumination direction; When the remaining power is not higher than the preset protection critical value and higher than the low performance critical value, the rotation angle of the photovoltaic tracking bracket is adjusted based on the illumination direction, so as to reduce the angle between the incident light direction of the photovoltaic cell and the illumination direction while keeping the difference between the rotation angle and the protection angle of the photovoltaic tracking bracket not exceeding the preset angle; When the remaining power is not higher than the low performance critical value, controlling the photovoltaic tracking bracket to rotate to the protection angle; The low performance critical value corresponds to the energy required to drive the photovoltaic tracking bracket to rotate to the protection angle under current meteorological conditions, and the preset protection critical value is greater than the low performance critical value.

2. The angle adjustment method of the photovoltaic tracking bracket according to claim 1, characterized in that: The determining the remaining power of the battery specifically includes: The charging current and the discharging current of the battery are integrated to obtain the amount of change in the amount of charge of the battery, and the remaining amount of charge of the battery is determined according to the initial amount of charge of the battery and the amount of change in the amount of charge.

3. The angle adjustment method of the photovoltaic tracking bracket according to claim 2, characterized in that: The step of integrating the charging current and the discharging current of the battery to obtain the amount of change in the amount of electricity of the battery specifically includes: Sampling the charging current or discharging current of the battery in a plurality of consecutive time periods to obtain the charging current or discharging current corresponding to each time period; The charging current or discharging current corresponding to each time period is multiplied by the length of each time period, and a plurality of results are summed to obtain the amount of change in the battery power.

4. The angle adjustment method of the photovoltaic tracking bracket according to claim 1, characterized in that: The determining the remaining power of the battery specifically includes: Based on calculation Determining the remaining power of the battery; Wherein, SOC is the remaining capacity of the battery, SOC0 is the initial capacity of the battery, δ is the charge and discharge efficiency of the battery, C E is the rated capacity of the battery, I is the charging current or discharging current of the battery, It is the time integral of the charging current or discharging current of the battery.

5. The angle adjustment method of the photovoltaic tracking bracket according to claim 2, characterized in that: The method further comprises: When the charging power and the discharging power of the storage battery are both lower than the preset power threshold within the preset time threshold, obtaining the voltage value between the positive electrode and the negative electrode of the storage battery, and determining the remaining power correction value of the storage battery according to the voltage value; When the difference between the remaining power of the storage battery and the remaining power correction value is greater than a preset difference threshold, the remaining power correction value is determined as the current remaining power of the storage battery.

6. The angle adjustment method of the photovoltaic tracking bracket according to claim 5, characterized in that: The step of obtaining a voltage value between the positive electrode and the negative electrode of the battery and determining a power correction value of the battery according to the voltage value specifically includes: Determining a current temperature value of the battery; The remaining power correction value of the battery is determined according to the corresponding relationship between the remaining power corresponding to the current temperature value of the battery and the charging and discharging voltage value of the battery, and the voltage value between the positive and negative electrodes of the battery.

7. The method for adjusting the angle of a photovoltaic tracking bracket according to any one of claims 1 to 6, characterized in that: The photovoltaic tracking bracket is driven by a motor and determines the low performance critical value of the battery based on current meteorological conditions, specifically including: Determine the basic motor power of the motor driving the photovoltaic tracking bracket to rotate based on the current angle of the photovoltaic tracking bracket, and determine the weather correction coefficient based on the current meteorological conditions; Based on the basic motor power, the weather correction factor and the time required to drive the photovoltaic tracking bracket to rotate a unit angle, the driving energy required to drive the photovoltaic tracking bracket from the current angle to the protection angle is determined, and the low performance critical value is determined based on the driving energy.

8. The method for adjusting the angle of a photovoltaic tracking bracket according to any one of claims 1 to 6, characterized in that: The determining the protection angle corresponding to the current meteorological condition based on the current meteorological condition specifically includes: When the wind speed is higher than the preset wind speed threshold, the preset high wind protection angle is determined as the protection angle corresponding to the current meteorological conditions; when the wind speed is not higher than the preset wind speed threshold and the snow thickness is higher than the preset snow thickness threshold, the preset heavy snow protection angle is determined as the protection angle corresponding to the current meteorological conditions.

9. A photovoltaic device, comprising a control device, a storage battery, a photovoltaic cell, a photovoltaic tracking bracket and a bracket driving device, wherein the photovoltaic cell is arranged on the photovoltaic tracking bracket, the bracket driving device is used to drive the photovoltaic tracking bracket to drive the photovoltaic cell to rotate, the storage battery is used to store the electrical energy generated by the photovoltaic cell, and the control device is used to execute the angle adjustment method of the photovoltaic tracking bracket described in any one of claims 1 to 8.

10. The photovoltaic device according to claim 9, characterized in that: The control device stores the corresponding relationship between the remaining power of the battery and the charging and discharging voltage value of the battery when the charging and discharging power of the battery is lower than the preset power threshold at different temperatures; The control device is used to integrate the charging current and the discharging current of the battery to obtain the amount of change in the amount of electricity of the battery, and determine the remaining amount of electricity of the battery according to the initial amount of electricity of the battery and the amount of change in electricity; It is also used to obtain the voltage value between the positive electrode and the negative electrode of the battery and the current temperature value of the battery when the charging power and the discharging power of the battery are both lower than the preset power threshold within the preset time threshold, and determine the remaining power correction value of the battery according to the corresponding relationship between the remaining power corresponding to the voltage value and the current temperature value and the charging and discharging voltage value of the battery; When the difference between the remaining power of the storage battery and the remaining power correction value is greater than a preset difference threshold, the remaining power correction value is determined as the current remaining power of the storage battery.

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