Maximum power point tracking control method, electronic equipment and photovoltaic system

Abstract

The embodiment of the invention discloses a maximum power point tracking control method, electronic equipment and a photovoltaic system. The method comprises the following steps: judging whether the output power of a photovoltaic module is smaller than a preset power threshold value or not; if yes, obtaining a reference voltage according to the preset voltage value every preset time; judging whether the reference voltage is greater than a preset voltage threshold; if yes, obtaining a reference voltage according to a preset voltage threshold value; and performing maximum power point tracking according to the reference voltage. According to the embodiment of the invention, in the weak light environment, the reference voltage is periodically obtained according to the preset voltage value to track the maximum power point, and the preset voltage threshold value is set to prevent the reference voltage from being too large and abnormal, so that the problem that the output voltage of the photovoltaic module is relatively low when the maximum power point tracking is applied to the weak light environment can be solved; the tracking voltage under weak light approaches the tracking voltage under non-weak light, and the same reference voltage is prevented from being maintained for a long time, so that the stability of a photovoltaic system is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of photovoltaic power generation, and in particular to a maximum power point tracking control method, electronic equipment and a photovoltaic system. Background Art

[0002] In photovoltaic power generation systems, maximum power point tracking (MPPT) of photovoltaic modules can improve photovoltaic power generation efficiency and reduce power generation costs, so maximum power point tracking is widely used. However, under conditions of insufficient light such as in the morning and evening, the output power of photovoltaic modules is small, and the power change caused by the same voltage change step is small, resulting in the conventional maximum power point tracking algorithm. In this case, it is easy to rapidly lower the voltage of the photovoltaic module, causing the inverter to stop working and then restart, affecting the reliability of the inverter; and at this time, the working voltage is on the left side of the photovoltaic module power P-voltage V curve. When the light is enhanced, the inverter may still be in a state of low voltage and power generation efficiency for a long time. Therefore, a maximum power point tracking algorithm for photovoltaic modules suitable for weak light environments is needed to avoid the above problems.

[0003] At present, the methods used to overcome weak light conditions include directly calculating the reference voltage under weak light conditions based on the open-circuit voltage of the photovoltaic module, connecting multiple photovoltaic modules in parallel to track the maximum power point under weak light conditions, and recording multiple power data at each voltage point for comparison. Among them, the method of directly calculating the voltage reference under weak light conditions based on the open-circuit voltage is simple and easy to implement. Its basic principle is: when the input current is less than the threshold, the system is judged to be in a weak light state. At this time, the reference voltage is directly set according to the open-circuit voltage of the photovoltaic module to approximately make the system near the maximum power point. However, this method does not perform dynamic tracking near the reference point. If the voltage reference is set unreasonably, the efficiency under weak light conditions will also be reduced. Moreover, after the inverter starts working, the reference voltage under different weak light environments is the same, which will also reduce the output efficiency of the photovoltaic module. Summary of the invention

[0004] The main technical problem solved by the embodiments of the present invention is to provide a maximum power point tracking control method, electronic equipment and photovoltaic system, which can effectively find the maximum power point during the maximum power point tracking process in a weak light environment and prevent the voltage from being too low for a long time.

[0005] In order to solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: to provide a control method for maximum power point tracking, including: judging whether the output power of the photovoltaic component is less than a preset power threshold; if so, obtaining a reference voltage according to a preset voltage value at preset time intervals; judging whether the reference voltage is greater than a preset voltage threshold; if so, obtaining the reference voltage according to the preset voltage threshold; performing maximum power point tracking according to the reference voltage, and again judging whether the output power is less than the preset power threshold.

[0006] In some embodiments, the preset voltage threshold is obtained by the following steps: determining whether the weak light time flag is 1; if so, obtaining the preset voltage threshold according to the maximum tracking voltage of the photovoltaic module in a non-weak light state; if not, obtaining the preset voltage threshold according to the maximum open circuit voltage of the photovoltaic module. The weak light time flag is a preset flag, which is set to 0 when the photovoltaic system is powered on, and is set to 1 when the output power is greater than the preset power threshold.

[0007] In some embodiments, obtaining the preset voltage threshold according to the maximum tracking voltage of the photovoltaic component in a non-weak light state includes: acquiring and recording the maximum tracking voltage when the photovoltaic component performs maximum power point tracking in a non-weak light state; and obtaining the preset voltage threshold according to the product of the maximum tracking voltage and a first preset coefficient.

[0008] In some embodiments, the first preset coefficient is an average value of an intersection of a voltage range of a plurality of photovoltaic modules when performing maximum power point tracking in a non-weak light state and a ratio interval of a maximum tracking voltage.

[0009] In some embodiments, obtaining the preset voltage threshold according to the maximum open circuit voltage of the photovoltaic component includes: acquiring and recording the maximum open circuit voltage; and obtaining the preset voltage threshold according to the product of the maximum open circuit voltage and a second preset coefficient.

[0010] In some embodiments, the second preset coefficient is an average value of an intersection of a voltage range of a plurality of photovoltaic modules when performing maximum power point tracking divided by a ratio interval of a maximum open circuit voltage in a non-weak light state.

[0011] In some embodiments, obtaining the reference voltage according to the preset voltage threshold includes: using the preset voltage threshold as the reference voltage.

[0012] In some embodiments, the maximum power point tracking according to the reference voltage includes: adjusting the operating point of the photovoltaic component according to the reference voltage to obtain the updated output power; determining whether the difference between the updated output power and the output power before the update is greater than 0; if not, stopping obtaining the reference voltage according to the preset voltage value.

[0013] To solve the above technical problems, another technical solution adopted in the embodiment of the present invention is: to provide an electronic device, comprising: at least one processor; at least one network interface, the network interface is communicatively connected to the corresponding processor; and a memory communicatively connected to the at least one processor; wherein the network interface is used to establish a communication connection between the processor and other external devices; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the control method of maximum power point tracking as described above.

[0014] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present invention is: to provide a photovoltaic system, including: a photovoltaic module; an inverter; and the electronic device as described above, the electronic device is connected to the photovoltaic module and the inverter respectively; the electronic device is used to execute the control method of maximum power point tracking as described above.

[0015] The beneficial effects of the embodiments of the present invention are as follows: Different from the prior art, the embodiments of the present invention can solve the problem of low output voltage of photovoltaic modules when maximum power point tracking is applied in a weak light environment by periodically obtaining a reference voltage according to a preset voltage value for maximum power point tracking in a weak light environment, and setting a preset voltage threshold to prevent the reference voltage from being abnormally large. The problem is that the tracking voltage in weak light is close to the tracking voltage in non-weak light, and the same reference voltage is avoided for too long to improve the stability of the photovoltaic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a photovoltaic system;

[0017] Figure 2 It is the power-voltage curve of the photovoltaic module under different light conditions;

[0018] Figure 3 It is a flow chart of a maximum power point tracking control method provided by an embodiment of the present invention;

[0019] Figure 4 yes Figure 2 A schematic diagram of the process of obtaining the preset power threshold in step S200 is shown;

[0020] Figure 5 yes Figure 3 The flowchart of step S220 is shown;

[0021] Figure 6 yes Figure 3 The flowchart of step S230 is shown;

[0022] Figure 7 yes Figure 2 The flowchart of step S600 is shown;

[0023] Figure 8 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom" and the like used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0026] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0027] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0028] Figure 1The structure diagram of a photovoltaic system is shown in FIG. 1 , which includes a control device 110, a photovoltaic module 120 and an inverter 130. The inverter 130 is connected to the photovoltaic module 120 and the power grid 140 respectively. The control device 110 includes a circuit sampling module 111 and a maximum power point tracking control module 112. The input end of the circuit sampling module 111 is connected to the photovoltaic module 120, the output end of the circuit sampling module 111 is connected to the input end of the maximum power point tracking control module 112, and the output end of the maximum power point tracking control module 112 is connected to the inverter 130.

[0029] When the photovoltaic system is working, the circuit sampling module 111 samples and calculates the output voltage and output current of the photovoltaic component 120, and sends them to the maximum power point tracking control module 112. The maximum power point tracking control module 112 calculates the corresponding reference voltage based on the sampling results and converts it into a corresponding switch tube control signal and sends it to the inverter 130 for control.

[0030] The output characteristics of the photovoltaic module 120 are described by the IV (current-voltage) curve and the PV (power-voltage) curve. The maximum power point is located at the highest point of the PV curve, and the maximum power point indicates that the output power of the photovoltaic module 120 is the maximum at this time. The maximum power point will move due to changes in factors such as light intensity, temperature and shading. Therefore, in order to maximize energy output, it is necessary to continuously adjust the operating point of the photovoltaic system so that it is always at the maximum power point.

[0031] The inverter 130 is a key component in the photovoltaic system, which is responsible for converting the direct current generated by the photovoltaic module 120 into alternating current. The inverter with MPPT function can monitor the output of the photovoltaic module and adjust its operating voltage accordingly to track the maximum power point.

[0032] The above process is a simplified process of MPPT. MPPT is a very critical part of the photovoltaic system. Its main function is to optimize the power output of photovoltaic cells. MPPT technology achieves this by adjusting the operation of the inverter.

[0033] In a photovoltaic system, the output voltage and current of the photovoltaic module follow specific IV (current-voltage) curve and PV (power-voltage) curve, such as Figure 2 The maximum power point refers to the specific voltage and current combination in these curves where the photovoltaic module can output the maximum power. Due to environmental factors (such as light intensity, temperature and shading), this maximum power point will change over time. Therefore, in order to maximize the efficiency of solar energy utilization, it is necessary to continuously adjust the photovoltaic system so that it works at the maximum power point.

[0034] MPPT technology tracks and maintains this maximum power point by adjusting the inverter. The inverter adjusts the output power of the photovoltaic array according to external factors such as ambient temperature and light intensity to ensure that the photovoltaic array always outputs maximum power. For example, if the voltage at the maximum power point is 550V at a certain moment, the inverter will adjust the control circuit to make the output voltage of the photovoltaic module close to 550V, thereby achieving maximum power output. If the inverter cannot accurately track this point, a certain amount of power generation will be lost.

[0035] The adjustment process is as follows:

[0036] The circuit sampling module 111 monitors the output voltage and output current of the photovoltaic component 120, and then outputs the output voltage and output current of the photovoltaic component 120 to the maximum power point tracking control module 112. The maximum power point tracking control module 112 analyzes the current operating point according to the output voltage and output current of the photovoltaic component 120, and compares it with previous data to determine the position of the maximum power point, and obtains a reference voltage according to the maximum power point.

[0037] The maximum power point tracking control module 112 converts the reference voltage into a control signal of the corresponding switch tube of the inverter 130, adjusts the voltage and current at the input end of the inverter 130, and thus changes the working point of the photovoltaic module 120. Due to the continuous change of environmental conditions, the maximum power point tracking control module 112 needs to continue the above process to track the maximum power point in real time. MPPT technology significantly improves the energy conversion efficiency of the photovoltaic system, ensuring that the maximum power output can be obtained even when the light and environmental conditions change.

[0038] In summary, MPPT technology mainly adjusts the inverter to track and maintain the output voltage of the photovoltaic module to reach the maximum power point, thereby optimizing the overall power output efficiency. Adjusting the inverter to track and maintain the output voltage of the photovoltaic module to reach the maximum power point is the basic working principle of MPPT technology.

[0039] However, under weak light conditions, the output power of the PV panels is small, and the power change caused by the same voltage change step is small, which causes the conventional maximum power point tracking algorithm to easily rapidly lower the voltage of the PV panels in this case, causing the inverter to stop working and then power on again, affecting the reliability of the inverter.

[0040] Existing methods for overcoming weak light conditions, such as directly giving a voltage reference value for maximum power point tracking, have the problem of a fixed voltage reference value. If the given voltage reference value is not the accurate maximum power point, the photovoltaic module will not be able to operate at the maximum power point. In addition, the fixed voltage reference value will cause the photovoltaic system to be in this state for a long time, requiring continuous shutdown and restart to jump out of this state, which will affect the stability of the photovoltaic system.

[0041] To solve the above problems, the present invention provides a maximum power point tracking control method, the flow chart of which is as follows: Figure 3 As shown, the specific steps include:

[0042] Step S100: pre-set the weak light time flag to 0.

[0043] The weak light time flag is preset, and in the initial state (ie, when the photovoltaic system is powered on), the weak light time flag is set to 0. The weak light time flag is used as a flag for subsequently determining whether the photovoltaic module has performed maximum power point tracking under non-weak light conditions.

[0044] For example, the photovoltaic system will be turned on in the morning every day. At this time, the weak light time flag is set to 0, indicating that it is morning and the photovoltaic components have not yet performed maximum power point tracking under non-weak light conditions; when it is afternoon, the light becomes strong, the photovoltaic components are in a non-weak light environment, and the output power is greater than the preset power threshold, then the weak light time flag is set to 1, indicating that it is afternoon and the photovoltaic components have performed maximum power point tracking under non-weak light conditions; of course, the weak light time flag cannot be completely used to represent morning or afternoon, and the above description is an ideal situation.

[0045] Step S200: determining whether the output power of the photovoltaic module is less than a preset power threshold.

[0046] In the embodiment of the present application, it is determined whether the photovoltaic component is in a weak light environment by judging whether the output power of the photovoltaic component is less than the preset power threshold. If the output power is less than the preset power threshold, it means that the photovoltaic component is in a weak light environment at this time, and step S300 is executed; if the output power is not less than the preset power threshold, it means that the photovoltaic component is in a non-weak light environment at this time, and the weak light time flag is then set to 1, and the maximum power point tracking is performed normally.

[0047] It should be noted that after determining that the output power of the PV module is less than the preset power threshold, the subsequent steps should be executed, that is, when the PV module is tracking the maximum power point in a non-weak light environment, a hysteresis loop can be added to prevent voltage fluctuations caused by repeated implementation of different maximum power point tracking strategies at this node.

[0048] Step S300: obtaining a reference voltage according to a preset voltage value.

[0049] It should be noted that there are many ways to set the reference voltage, such as setting a fixed reference voltage as mentioned above, but this method has defects. The embodiment of the present invention sets the reference voltage dynamically by presetting the voltage value. Specifically, the initial value of the reference voltage is set to 0, the preset time is set, and the preset voltage value is used as a step value. After the preset time, the reference voltage is gradually increased so that the photovoltaic module works at the maximum power point; of course, the initial value of the reference voltage can also be set to a preset voltage, and the preset voltage value is used as a step value. After the preset time, the reference voltage is gradually reduced so that the photovoltaic module works at the maximum power point.

[0050] This can be achieved through a timer after a preset time has passed, the timer is reset, and then when the accumulated time reaches the preset time, the reference voltage is updated.

[0051] Step S400: determining whether the reference voltage is greater than a preset voltage threshold.

[0052] In the embodiment of the present application, the reference voltage is gradually increased, but if the reference voltage is set too high, it will affect the output power, so the reference voltage needs to be limited. Therefore, after each reference voltage is obtained, it is necessary to determine whether the reference voltage is greater than the preset voltage threshold, and if so, step S500 is executed.

[0053] It should be noted that in order to allow more time at the maximum power point during weak-light tracking, and to make the weak-light maximum power point tracking period close to the non-weak-light maximum power point tracking period, so as to avoid being mistaken for abnormal tracking, the preset voltage threshold in the implementation mode of the present application is determined by the maximum tracking voltage or the maximum open-circuit voltage of the photovoltaic module during non-weak-light maximum power point tracking.

[0054] Step S500: obtaining a reference voltage according to a preset voltage threshold.

[0055] When the reference voltage is greater than the preset voltage threshold, the reference voltage is calculated according to the preset voltage threshold, and the specific acquisition method depends on the value of the preset voltage threshold. In the embodiment of the present application, when the reference voltage is greater than the preset voltage threshold, the reference voltage is set to the preset voltage threshold.

[0056] Step S600: performing maximum power point tracking according to a reference voltage.

[0057] Specifically, the control signal of the inverter is obtained by using the reference voltage to adjust the photovoltaic module. In this process, the perturbation observation method is used to compare the output power of the photovoltaic module after the update with the output power of the photovoltaic module before the update to determine whether to stop updating the reference voltage. If it is not necessary to stop updating the reference voltage, return to step S200 to form a loop and continuously update the reference voltage.

[0058] In some embodiments of the present application, the flowchart of the method for obtaining the preset voltage threshold is as follows: Figure 4 As shown, the specific steps include:

[0059] Step S210: Determine whether the low-light time flag is 1.

[0060] In the above description, it is known that the weak light time flag is used as a flag for subsequently determining whether the photovoltaic component has performed maximum power point tracking under non-weak light conditions. If the weak light time flag is 1, it means that the photovoltaic component has performed maximum power point tracking under non-weak light conditions, and step S220 is executed; if the weak light time flag is 0, it means that the photovoltaic component has not performed maximum power point tracking under non-weak light conditions, and step S230 is executed.

[0061] Step S220: obtaining a preset voltage threshold according to the maximum tracking voltage of the photovoltaic module in a non-weak light state.

[0062] On the premise that the photovoltaic module has been subjected to maximum power point tracking under non-weak light conditions, the maximum tracking voltage of the photovoltaic module under non-weak light conditions can be obtained, thereby obtaining a preset voltage threshold.

[0063] Step S230: obtaining a preset voltage threshold according to the maximum open-circuit voltage of the photovoltaic module.

[0064] If the photovoltaic module has not performed maximum power point tracking under non-weak light conditions, the maximum tracking voltage of the photovoltaic module under non-weak light conditions cannot be obtained, and thus the preset voltage threshold can be obtained according to the maximum open circuit voltage of the photovoltaic module.

[0065] It should be noted that the preset voltage threshold may also be calculated based on other relevant parameters, and may also be set based on actual test data of the photovoltaic module.

[0066] In some embodiments of the present application, the flowchart of step S220 is as follows: Figure 5 As shown, the specific steps include:

[0067] Step S221: when the photovoltaic module is in a non-weak light state and performs maximum power point tracking, the maximum tracking voltage is obtained and recorded.

[0068] When the output power of the photovoltaic module is not less than the preset power threshold in step S200, the photovoltaic system will perform conventional maximum power point tracking under non-weak light conditions. During this process, a maximum tracking voltage can be obtained and recorded.

[0069] Step S222: Obtain a preset voltage threshold according to the product of the maximum tracking voltage and the first preset coefficient.

[0070] In an embodiment of the present application, the first preset coefficient is calculated in the following manner: the voltage range and the maximum tracking voltage of several photovoltaic modules when performing maximum power point tracking in a non-weak light state are collected, the several voltage ranges are divided by the corresponding maximum tracking voltage to obtain several ratio intervals, and then the intersection of these several ratio intervals is taken, and the average value of the elements in the intersection is calculated, and the average value is used as the first preset coefficient.

[0071] It should be noted that if there is no intersection among these ratio intervals, the maximum ratio in each ratio interval is taken as the first preset coefficient.

[0072] Then, the first preset coefficient is multiplied by the pre-recorded maximum tracking voltage to obtain a preset voltage threshold.

[0073] In some embodiments of the present application, the flowchart of step S230 is as follows: Figure 6 As shown, the specific steps include:

[0074] Step S231: Obtain and record the maximum open circuit voltage.

[0075] The maximum open circuit voltage is obtained by the photovoltaic system when it is powered on, and the maximum open circuit voltage is recorded for subsequent calculations.

[0076] Step S232: Obtain a preset voltage threshold according to the product of the maximum open circuit voltage and the second preset coefficient.

[0077] In an embodiment of the present application, the second preset coefficient is calculated in the following manner: the voltage range and the maximum open circuit voltage of several photovoltaic modules are collected when the maximum power point tracking is performed in a non-weak light state, the several voltage ranges are divided by the corresponding maximum open circuit voltage, and several ratio intervals are obtained, and then the intersection of these several ratio intervals is taken, and the average value of the elements in the intersection is calculated, and the average value is used as the second preset coefficient.

[0078] It should be noted that if there is no intersection among these ratio intervals, the maximum ratio in each ratio interval is taken as the second preset coefficient.

[0079] Then, the second preset coefficient is multiplied by the pre-recorded maximum open circuit voltage to obtain a preset voltage threshold.

[0080] In some embodiments of the present application, the flowchart of step S600 is as follows: Figure 7 As shown, the specific steps include:

[0081] Step S610: adjusting the working point of the photovoltaic module according to the reference voltage to obtain an updated output power.

[0082] Specifically, a control signal is output to the inverter according to the reference voltage, so that the inverter adjusts the output voltage and output current of the photovoltaic module, and the updated output power is calculated according to the adjusted output voltage and output current.

[0083] Step S620: Determine whether the difference between the output power after updating and the output power before updating is greater than 0.

[0084] Determine whether the difference between the updated output power and the output power before the update is greater than 0. If so, it means that the adjusted output voltage and output current increase the output power of the photovoltaic module, that is, the photovoltaic module has not yet reached the maximum output power. Therefore, it is necessary to maintain the current adjustment direction and adjust the reference voltage to enable the photovoltaic panel to reach the maximum output power.

[0085] Maintain the current adjustment direction as follows: if the reference voltage is in an increasing trend, then keep increasing the reference voltage; if the reference voltage is in a decreasing trend, then keep decreasing the reference voltage.

[0086] Specifically, if the difference between the updated output power and the output power before updating is greater than 0, return to step S200; if not, the difference between the updated output power and the output power before updating is not greater than 0, stop obtaining the reference voltage according to the preset voltage value.

[0087] Different from the prior art, the embodiments of the present invention can solve the problem of low output voltage of photovoltaic modules when maximum power point tracking is applied in a weak light environment by periodically obtaining a reference voltage according to a preset voltage value for maximum power point tracking in a weak light environment, and setting a preset voltage threshold to prevent the reference voltage from being abnormally large. The tracking voltage in weak light is made closer to the tracking voltage in non-weak light, and by periodically increasing the reference voltage, the system can quickly exit the weak light state without restarting, avoiding the system being in a weak light state for a long time due to maintaining the original reference voltage after the light is enhanced, thereby improving the stability and reliability of the photovoltaic system.

[0088] The embodiment of the present invention also provides an electronic device based on the above-mentioned maximum power point tracking control method, and its structural schematic diagram is as follows: Figure 8 As shown, the electronic device 10 includes:

[0089] One or more processors, a network interface 12 and a memory 13, Figure 8 In the figure, a processor, a network interface 12 and a memory 13 are taken as an example.

[0090] The network interface 12 is connected to the corresponding processor in communication, and the processor and the memory 12 can be connected via a bus or other means. Figure 8 The example of connecting through bus is taken in the following.

[0091] The network interface 12 is used to establish a communication connection between the processor and other external devices, including the following types: RJ-45 interface, SC optical fiber interface, AUI interface, FDDI interface, Console interface and other interface types.

[0092] The memory 13 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules. The processor executes various functional applications and data processing of the electronic device by running the non-volatile software programs, instructions and units stored in the memory 13, that is, the control method for maximum power point tracking of the above method embodiment is implemented.

[0093] The memory 13 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 13 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 13 may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0094] The one or more units are stored in the memory 13, and when executed by one or more processors, perform the control method of maximum power point tracking in any of the above method embodiments, for example, perform the above described Figure 2 The method comprises steps S100 to S600.

[0095] The above electronic device can execute the control method of maximum power point tracking provided by the embodiment of the present invention, and has the program module and beneficial effects corresponding to the execution method. For technical details not fully described in the electronic device embodiment, please refer to the control method of maximum power point tracking provided by the embodiment of the present invention.

[0096] Based on the electronic device provided in the above embodiment, the embodiment of the present invention provides a photovoltaic system, which includes a photovoltaic module, an inverter and the electronic device as described above, and the electronic device is connected to the photovoltaic module and the inverter respectively; the electronic device is used to perform the following Figure 2 The maximum power point tracking control method is shown.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A maximum power point tracking control method, characterized in that: include: Determine whether the output power of the photovoltaic module is less than a preset power threshold; If yes, obtaining a reference voltage according to a preset voltage value at every preset time; Determining whether the reference voltage is greater than a preset voltage threshold; If yes, obtaining the reference voltage according to the preset voltage threshold; Maximum power point tracking is performed according to the reference voltage.

2. The method according to claim 1, characterized in that The preset voltage threshold is obtained by the following steps: Determine whether the low light time flag is 1; If yes, obtaining the preset voltage threshold value according to the maximum tracking voltage of the photovoltaic module in a non-weak light state; If not, the preset voltage threshold is obtained according to the maximum open-circuit voltage of the photovoltaic component. The weak light time mark is a preset mark, which is set to 0 when the photovoltaic system is powered on, and is set to 1 when the output power is greater than the preset power threshold.

3. The method according to claim 2, characterized in that The step of obtaining the preset voltage threshold according to the maximum tracking voltage of the photovoltaic module in a non-weak light state includes: When the photovoltaic module is in a non-weak light state and performs maximum power point tracking, obtaining and recording the maximum tracking voltage; The preset voltage threshold is obtained according to the product of the maximum tracking voltage and a first preset coefficient.

4. The method according to claim 3, characterized in that The first preset coefficient is an average value of an intersection of a voltage range of a plurality of photovoltaic modules when performing maximum power point tracking in a non-weak light state and a ratio interval of a maximum tracking voltage.

5. The method according to claim 2, characterized in that: The step of obtaining the preset voltage threshold according to the maximum open-circuit voltage of the photovoltaic module comprises: Obtaining and recording the maximum open circuit voltage; The preset voltage threshold is obtained according to the product of the maximum open-circuit voltage and a second preset coefficient.

6. The method according to claim 5, characterized in that The second preset coefficient is an average value of an intersection of a voltage range of a plurality of photovoltaic modules when performing maximum power point tracking divided by a ratio interval of a maximum open circuit voltage in a non-weak light state.

7. The method according to claim 1, characterized in that The obtaining the reference voltage according to the preset voltage threshold comprises: The preset voltage threshold is used as the reference voltage.

8. The method according to any one of claims 1 to 7, characterized in that: The performing maximum power point tracking according to the reference voltage comprises: Adjusting the working point of the photovoltaic component according to the reference voltage to obtain the updated output power; Determine whether the difference between the output power after updating and the output power before updating is greater than 0; If not, stop obtaining the reference voltage according to the preset voltage value.

9. An electronic device, characterized in that: include: at least one processor; at least one network interface, the network interface being communicatively connected to a corresponding processor; as well as, a memory communicatively connected to the at least one processor; wherein, The network interface is used to establish a communication connection between the processor and other external devices; The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the maximum power point tracking control method as described in any one of claims 1-8.

10. A photovoltaic system, characterized in that: include: Photovoltaic panels; Inverter; And the electronic device according to claim 9, wherein the electronic device is connected to the photovoltaic module and the inverter respectively; The electronic device is used to execute the maximum power point tracking control method as described in any one of claims 1-8.

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