2000W Photovoltaic Intelligent MPPT Power Supply Control Method and System

Abstract

The present invention discloses a 2000W photovoltaic intelligent MPPT power supply control method and system for an energy storage battery. The method comprises: obtaining a photovoltaic input voltage; detecting whether the photovoltaic input voltage is within a preset voltage range; if the photovoltaic input voltage is within the preset voltage range, performing forward or reverse perturbation processing on the photovoltaic input voltage using an MPPT algorithm to obtain a photovoltaic output voltage corresponding to the maximum photovoltaic output power; and charging the energy storage battery based on the photovoltaic output voltage, wherein the photovoltaic output voltage is the photovoltaic output voltage corresponding to the maximum photovoltaic output power. The present invention processes the photovoltaic input voltage using the MPPT algorithm to obtain a photovoltaic output voltage corresponding to the maximum photovoltaic output power, and then uses the photovoltaic output voltage corresponding to the maximum photovoltaic output power to charge the energy storage battery, thereby improving the charging efficiency of the energy storage battery and fully realizing the maximum efficiency of photovoltaic power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic energy storage, and in particular to a power supply control method and system for a 2000W photovoltaic intelligent MPPT. Background Art

[0002] The development and application of new energy sources has become an inevitable trend in today's global development. Solar energy is a new energy source with great potential, and photovoltaic power generation is one of the main ways to utilize solar energy. Photovoltaic power generation is of great significance in alleviating the energy crisis and reducing environmental pollution, and it has broad application prospects.

[0003] However, photovoltaic power generation is affected by sunlight intensity (or radiation intensity) and ambient temperature, causing the output voltage to be unstable, resulting in unstable output power. When using photovoltaic power to charge energy storage batteries, the unstable output power of photovoltaic power generation also causes the power received by the energy storage battery to be unstable during charging, resulting in low charging efficiency of the energy storage battery and failure to maximize the efficiency of photovoltaic power generation.

[0004] Therefore, there is still an urgent need for a power supply control method that can improve the charging efficiency of energy storage batteries and give full play to the maximum efficiency of photovoltaic power generation. Summary of the Invention

[0005] The main purpose of the present invention is to propose a 2000W photovoltaic intelligent MPPT power supply control method and system, aiming to improve the charging efficiency of energy storage batteries and give full play to the maximum efficiency of photovoltaic power generation.

[0006] To achieve the above objectives, the present invention proposes a 2000W photovoltaic intelligent MPPT power supply control method for an energy storage battery. The 2000W photovoltaic intelligent MPPT power supply control method includes:

[0007] Get the photovoltaic input voltage of the photovoltaic;

[0008] detecting whether the photovoltaic input voltage is within a preset voltage range;

[0009] If the photovoltaic input voltage is within the preset voltage range, the MPPT algorithm is used to perform forward or reverse perturbation processing on the photovoltaic input voltage to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power;

[0010] The energy storage battery is charged according to the photovoltaic output voltage, wherein the photovoltaic output voltage is the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0011] In some embodiments, the MPPT algorithm is used to perform forward or reverse perturbation processing on the photovoltaic input voltage to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power, including:

[0012] determining a first input voltage according to the photovoltaic input voltage, and determining a first input power according to the first input voltage;

[0013] Performing a forward disturbance process on the first input voltage to obtain a second input voltage, and determining a second input power according to the second input voltage;

[0014] comparing the magnitude relationship between the first input power and the second input power;

[0015] If the first input power is less than the second input power, updating the value of the first input voltage to the value of the second input voltage, and performing the step of determining the first input power according to the first input voltage;

[0016] The number of times the forward disturbance process is performed is determined. If the number of times the forward disturbance process is performed is equal to a first preset number, the second input voltage is determined as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0017] In some embodiments, after comparing the first input power and the second input power, the method further includes:

[0018] If the first input power is greater than the second input power, performing reverse perturbation processing on the first input voltage to obtain a third input voltage, and determining a third input power according to the third input voltage;

[0019] comparing the magnitude relationship between the first input power and the third input power;

[0020] If the first input power is less than the third input power, updating the value of the first input voltage to the value of the third input voltage, determining the first input power based on the first input voltage, performing reverse perturbation processing on the first input voltage to obtain a third input voltage, and determining the third input power based on the third input voltage;

[0021] The number of times the reverse disturbance process is performed is determined. If the number of times the reverse disturbance process is equal to a second preset number, the third input voltage is determined as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0022] In some embodiments, the MPPT algorithm is used to perform forward or reverse perturbation processing on the photovoltaic input voltage to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power, including:

[0023] Continuously obtain work instructions for disturbance handling;

[0024] After the disturbance processing work instruction is obtained, the step of performing forward disturbance or reverse disturbance processing on the photovoltaic input voltage using the MPPT algorithm is executed to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0025] In some embodiments, charging the energy storage battery according to the photovoltaic output voltage includes:

[0026] Detecting whether the photovoltaic output voltage is the optimal charging voltage of the energy storage battery;

[0027] If the photovoltaic output voltage is the optimal charging voltage, charging the energy storage battery according to the photovoltaic output voltage;

[0028] If the photovoltaic output voltage is not the optimal charging voltage, the photovoltaic output voltage is adjusted so that the photovoltaic output voltage is adjusted to the optimal charging voltage.

[0029] In some embodiments, adjusting the photovoltaic output voltage includes:

[0030] Determining whether the photovoltaic output voltage is greater than the optimal charging voltage;

[0031] If the photovoltaic output voltage is greater than the optimal charging voltage, the photovoltaic output voltage is stepped down;

[0032] If the photovoltaic output voltage is lower than the optimal charging voltage, the photovoltaic output voltage is boosted.

[0033] In some embodiments, after the photovoltaic output voltage reaches the optimal charging voltage, the method further includes:

[0034] determining a photovoltaic output current according to the photovoltaic output voltage;

[0035] detecting that the photovoltaic output current is a constant current;

[0036] If the photovoltaic output current is a constant current, the energy storage battery is charged according to the photovoltaic output voltage and the photovoltaic output current.

[0037] In some embodiments, the power supply control method of the 2000W photovoltaic intelligent MPPT further includes:

[0038] Obtaining the battery voltage of the energy storage battery;

[0039] Determining whether the battery voltage is equal to a preset voltage;

[0040] If the battery voltage is equal to the preset voltage, charging of the energy storage battery is stopped.

[0041] In some embodiments, the power supply control method of the 2000W photovoltaic intelligent MPPT further includes:

[0042] Obtaining the current flow direction of the energy storage battery;

[0043] Determining the current flow direction, wherein the current flow direction includes current flowing into the energy storage battery and current flowing out of the energy storage battery;

[0044] If the current flows into the energy storage battery, the charging current sampling function is started;

[0045] If the current flows out of the energy storage battery, the discharge current sampling function is started.

[0046] The present invention also proposes a 2000W photovoltaic intelligent MPPT power control system, which includes a 2000W photovoltaic and energy storage battery. The energy storage battery includes a main control module, which is configured with an MPPT algorithm. The main control module can execute any of the above-mentioned 2000W photovoltaic intelligent MPPT power control methods.

[0047] The present invention processes the photovoltaic input voltage through the MPPT algorithm to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power, and then uses the photovoltaic output voltage corresponding to the maximum photovoltaic output power to charge the energy storage battery; the MPPT algorithm ensures that the photovoltaic input voltage generated during photovoltaic power generation is output at the photovoltaic output voltage corresponding to the maximum photovoltaic output power, and charges the energy storage battery; thereby improving the charging efficiency of the energy storage battery and giving full play to the maximum efficiency of photovoltaic power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Schematic diagram of the power supply control method of a 2000W photovoltaic intelligent MPPT in an embodiment of the present invention;

[0049] Figure 2 2000W photovoltaic intelligent MPPT power supply control method according to another embodiment of the present invention;

[0050] Figure 3 2000W photovoltaic intelligent MPPT power supply control method according to another embodiment of the present invention;

[0051] Figure 4 2000W photovoltaic intelligent MPPT power supply control method according to another embodiment of the present invention;

[0052] Figure 52000W photovoltaic intelligent MPPT power supply control method according to another embodiment of the present invention;

[0053] Figure 6 2000W photovoltaic intelligent MPPT power supply control method according to another embodiment of the present invention;

[0054] Figure 7 2000W photovoltaic intelligent MPPT power supply control method according to another embodiment of the present invention;

[0055] Figure 8 2000W photovoltaic intelligent MPPT power supply control method according to another embodiment of the present invention;

[0056] Figure 9 This is a schematic diagram of the structure of a 2000W photovoltaic intelligent MPPT power control system according to an embodiment of the present invention;

[0057] Figure 10 This is a structural diagram of a 2000W photovoltaic intelligent MPPT power supply control device according to an embodiment of the present invention.

[0058] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0059] The following will be combined with the accompanying drawings to clearly and completely describe the solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0060] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0061] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0062] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] To achieve the above objectives, the present invention proposes a 2000W photovoltaic intelligent MPPT power supply control method for an energy storage battery. The 2000W photovoltaic intelligent MPPT power supply control method includes:

[0064] Step S110, obtaining the photovoltaic input voltage of the photovoltaic;

[0065] Step S120, detecting whether the photovoltaic input voltage is within a preset voltage range;

[0066] Step S130: If the photovoltaic input voltage is within the preset voltage range, the MPPT algorithm is used to perform forward or reverse perturbation processing on the photovoltaic input voltage to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power;

[0067] Step S140 , charging the energy storage battery according to the photovoltaic output voltage, wherein the photovoltaic output voltage is the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0068] In this embodiment, referring to Figure 1 and Figure 9The power control method for a 2000W photovoltaic smart MPPT is applied to the main control module of the energy storage battery in the power control system of the 2000W photovoltaic smart MPPT. The power control system of the 2000W photovoltaic smart MPPT includes a 2000W photovoltaic system and an energy storage battery. The 2000W photovoltaic system refers to a system with a rated power of 2000 watts. This means that under standard lighting conditions (for example, a solar irradiance of 1000W / ㎡ and a temperature of 25°C), the 2000W photovoltaic system can generate 2000 watts (2 kWh) of electricity per hour. The energy storage battery can store the electricity generated by the 2000W photovoltaic system and can also be used as a power source to release the electricity. The energy storage battery is equipped with a main control module that executes the power control method of the 2000W photovoltaic smart MPPT. The main control module is equipped with an MPPT (Maximum Power Point Tracking) algorithm. The main control module uses the MPPT algorithm to ensure that the photovoltaic input voltage generated during photovoltaic power generation is output at the photovoltaic output voltage corresponding to the maximum photovoltaic output power, and charges the energy storage battery. This improves the charging efficiency of the energy storage battery and maximizes the efficiency of photovoltaic power generation. In this embodiment, the main control module is the main body for executing all steps of the method.

[0069] It is understandable that the photovoltaics in the embodiments are all 2000W photovoltaics. Photovoltaics are connected to energy storage batteries, and the electricity generated by photovoltaic power generation can be transmitted to the energy storage battery, so that the energy storage battery can store it. Among them, the power generated by photovoltaic power generation will change with external conditions such as light intensity and ambient temperature, and there is an operating point where the power can reach the maximum value, that is, the maximum power point. The role of the MPPT algorithm is to monitor the output of photovoltaic electricity in real time, and by adjusting the circuit parameters, the power of photovoltaic electricity is always near the maximum power point, thereby improving the charging efficiency of the energy storage battery and giving full play to the maximum efficiency of photovoltaic power generation.

[0070] When photovoltaic power generation is in progress, it generates electricity, which is then transmitted to the energy storage battery. At this point, the energy storage battery receives the photovoltaic input electricity. After the energy storage battery receives the photovoltaic input electricity, the main control module in the energy storage battery can obtain the photovoltaic input voltage based on the photovoltaic input electricity. The energy storage battery can be equipped with a voltage detector. The voltage detector detects the voltage corresponding to the photovoltaic input electricity and thus obtains the photovoltaic input voltage. At this point, the main control module can obtain the photovoltaic input voltage from the voltage detector.

[0071] After receiving the photovoltaic input voltage, the main control module also tests it to see if it's within a preset voltage range. The energy storage battery may include multiple cells, which are used to store photovoltaic-generated electricity. After the energy storage battery receives the photovoltaic input power, the main control module does not directly transmit the photovoltaic input power to the multiple cells. The main control module first checks to see if the photovoltaic input voltage is within a preset voltage range, which can be greater than 12V and less than 162V.

[0072] If the PV input voltage is outside the preset voltage range—that is, less than 12V or greater than 162V—the main control module can control the energy storage battery to enter standby mode, disabling the PV input power to charge the energy storage battery (its multiple cells). For example, when the PV input voltage is less than 12V, the charging voltage is considered too low. The charging voltage may not reach the minimum voltage threshold for charging the energy storage battery, preventing the chemical reactions within the cells from effectively initiating or only proceeding at a very weak level, making proper charging impossible. Furthermore, prolonged exposure to this undervoltage state can cause the cell capacity to gradually decrease, shortening the battery's service life. When the PV input voltage is greater than 162V, the charging voltage is considered too high. Excessive charging voltage generates more heat during charging. Overheating accelerates the decomposition and aging of the chemical substances within the cells, reducing the battery's performance and lifespan, and potentially even causing safety issues.

[0073] If the PV input voltage is within the preset voltage range—that is, greater than 12V and less than 162V—the main control module determines that the current PV input voltage meets the voltage requirements for charging the energy storage battery. Because the power generated by PV power generation varies with external conditions such as light intensity and ambient temperature, the PV input voltage can be unstable. This means that even if the PV input voltage is within the preset voltage range, it can still be unstable. Therefore, the main control module does not directly charge the energy storage battery when the PV input voltage is within the preset voltage range. Instead, it first uses the MPPT algorithm to perform a forward or reverse perturbation on the PV input voltage to determine the PV output voltage corresponding to the maximum PV output power. Since the maximum PV output power is fixed, the corresponding PV output voltage is also fixed. By using the MPPT algorithm to perform a forward or reverse perturbation on the PV input voltage, a relatively stable PV output voltage corresponding to the maximum PV output power can be obtained.

[0074] The main control module uses the MPPT algorithm to perform forward or reverse perturbations on the photovoltaic input voltage to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power. Only then will the main control module charge the energy storage battery based on this photovoltaic output voltage. Specifically, the main control module first processes the photovoltaic input electricity, converting it into a relatively stable voltage corresponding to the maximum output power. Only then will the main control module use this processed photovoltaic input electricity to charge the energy storage battery (its multiple cells).

[0075] The use of the MPPT algorithm to perform forward or reverse perturbation on the photovoltaic input voltage may be to perform forward perturbation on the photovoltaic input voltage using the MPPT algorithm, or to perform reverse perturbation on the photovoltaic input voltage using the MPPT algorithm. The MPPT algorithm may be a perturbation-observation algorithm. A perturbation-observation algorithm periodically perturbs the voltage of the photovoltaic-generated electricity (forward or reverse), and then compares the power changes before and after the perturbation to determine the direction of subsequent perturbation, thereby gradually approaching the maximum power point of the photovoltaic-generated electricity.

[0076] This embodiment processes the photovoltaic input voltage through the MPPT algorithm to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power, and then uses the photovoltaic output voltage corresponding to the maximum photovoltaic output power to charge the energy storage battery. The MPPT algorithm ensures that the photovoltaic input voltage generated during photovoltaic power generation is output at the photovoltaic output voltage corresponding to the maximum photovoltaic output power and charges the energy storage battery. This improves the charging efficiency of the energy storage battery and fully utilizes the maximum efficiency of photovoltaic power generation.

[0077] In some embodiments, the aforementioned method of performing forward or reverse perturbation processing on the photovoltaic input voltage using the MPPT algorithm to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power includes:

[0078] Step S150, determining a first input voltage according to the photovoltaic input voltage, and determining a first input power according to the first input voltage;

[0079] Step S151, performing a forward disturbance process on the first input voltage to obtain a second input voltage, and determining a second input power according to the second input voltage;

[0080] Step S152, comparing the magnitude relationship between the first input power and the second input power;

[0081] Step S153: if the first input power is less than the second input power, the value of the first input voltage is updated to the value of the second input voltage, and the step of determining the first input power according to the first input voltage is performed;

[0082] Step S154 , determining the number of forward disturbance processes, and if the number of forward disturbance processes is equal to the first preset number, determining the second input voltage as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0083] In this embodiment, referring to Figure 2 When the main control module executes step S130, it performs forward disturbance processing. The energy storage battery may be equipped with a current detector. The current detector can detect the current corresponding to the photovoltaic input power, thereby obtaining the photovoltaic input current. At this point, the main control module can obtain the photovoltaic input current from the current detector.

[0084] The main control module determines the first input voltage based on the photovoltaic input voltage, specifically, the photovoltaic input voltage as the first input voltage. Alternatively, the main control module assigns the value of the photovoltaic input voltage to the first input voltage. The main control module then determines the first input power based on the first input voltage, specifically, the first input power based on the first input voltage and the real-time measured photovoltaic input current. For example, based on the power formula (power = voltage × current), the main control module can multiply the first input voltage by the real-time measured photovoltaic input current to obtain the first input power.

[0085] The main control module pre-sets a perturbation step size. This perturbation step size can be user-defined or automatically set by the main control module based on actual conditions. The perturbation step size can be set using a fixed or adaptive method. Fixed-step method: The main control module sets a fixed perturbation step size when light intensity and temperature are relatively stable. Adaptive-step method: The main control module automatically adjusts the perturbation step size in real time based on environmental parameters such as light intensity and temperature, as well as photovoltaic characteristics.

[0086] After obtaining the first input voltage and the first input power, the main control module performs a forward perturbation on the first input voltage to obtain a second input voltage. For example, the main control module adds a perturbation step size to the first input voltage to obtain the second input voltage (i.e., second input voltage = first input voltage + perturbation step size). The main control module then determines the second input power based on the second input voltage. Specifically, the main control module determines the second input power based on the second input voltage and the real-time measured photovoltaic input current. For example, based on the power formula (power = voltage × current), the main control module can multiply the second input voltage by the real-time measured photovoltaic input current to obtain the second input power.

[0087] After receiving the first and second input powers, the main control module compares them. If the first input power is less than the second, the perturbation process is in the correct direction and can continue in that direction. If the first input power is greater than the second, the perturbation process is in the wrong direction and the perturbation process must be reversed.

[0088] If the main control module determines that the first input power is less than the second input power, the main control module will continue to perform forward disturbance processing, and the main control module will continue to perform forward disturbance processing based on the previous forward disturbance processing. The main control module will update the value of the first input voltage to the value of the second input voltage, that is, the main control module will assign the value of the second input voltage to the first input voltage to complete the update of the first input voltage. Moreover, after completing the update of the first input voltage, the main control module will also clear the second input voltage at this time, so that the next time the first input voltage is subjected to forward disturbance processing, the second input voltage will be obtained again. That is, when the first input power is less than the second input power, the main control module will update the value of the first input voltage to the value of the second input voltage, and execute the step of determining the first input power based on the first input voltage. In other words, the main control module will perform forward disturbance processing multiple times so that the second input voltage gradually approaches the voltage corresponding to the maximum photovoltaic output power.

[0089] The main control module can record the number of forward disturbance processing times, and the main control module will also determine whether the number of forward disturbance processing times is equal to the first preset number. When the number of forward disturbance processing times reaches the first preset number, the second input voltage will infinitely approach the voltage corresponding to the maximum photovoltaic output power, that is, it can be regarded as the second input voltage being equal to the voltage corresponding to the maximum photovoltaic output power. The first preset number can be set according to actual conditions. When the number of forward disturbance processing times is equal to the first preset number, the main control module can determine the second input voltage as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0090] In a preferred embodiment, since the photovoltaic power-voltage (PV) curve exhibits a unimodal characteristic, the maximum power point (MPP) is the peak point on the curve. To the left of the MPP (voltage below the MPP), power increases with increasing voltage; to the right of the MPP (voltage above the MPP), power decreases with increasing voltage. Therefore, when the first input voltage falls to the left of the MPP, multiple forward perturbation processes can be performed to determine whether the second input voltage is the PV output voltage corresponding to the PV maximum output power. For example, during the forward perturbation process, if the first input power is less than the second input power, the forward perturbation process continues until the first input power exceeds the second input power. At this point, it is determined that the number of forward perturbation processes has exceeded a first predetermined number, and the second input voltage obtained from the previous forward perturbation process can be determined as the PV output voltage corresponding to the PV maximum output power. In this embodiment, the first predetermined number can be determined based on a comparison between the first and second input powers.

[0091] In some embodiments, after comparing the magnitude relationship between the first input power and the second input power, the method further includes:

[0092] Step S160: If the first input power is greater than the second input power, reverse perturbation processing is performed on the first input voltage to obtain a third input voltage, and a third input power is determined according to the third input voltage;

[0093] Step S161, comparing the magnitude relationship between the first input power and the third input power;

[0094] Step S162: if the first input power is less than the third input power, updating the value of the first input voltage to the value of the third input voltage, determining the first input power based on the first input voltage, performing reverse perturbation processing on the first input voltage to obtain a third input voltage, and determining the third input power based on the third input voltage;

[0095] Step S163, determining the number of reverse disturbance processes, and if the number of reverse disturbance processes is equal to the second preset number, determining the third input voltage as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0096] In this embodiment, referring to Figure 3, after executing step S152, the main control module performs reverse disturbance processing. Among them, a current detector can be provided in the energy storage battery. The current detector can detect the current corresponding to the photovoltaic input electricity, thereby obtaining the photovoltaic input current. At this time, the main control module can obtain the photovoltaic input current from the current detector. Among them, the main control module will pre-set a disturbance step size. Among them, the disturbance step size can be customized by the user; it can also be automatically set by the main control module according to actual conditions, and the setting method of the disturbance step size can include a fixed step size method, an adaptive step size method, etc. Fixed step size method: The main control module can set a fixed disturbance step size when the light intensity and temperature are relatively stable. Adaptive step size method: The main control module can automatically adjust the disturbance step size in real time according to environmental parameters such as light intensity and temperature and the characteristics of photovoltaics.

[0097] If the main control module determines that the first input power is greater than the second input power, the second input voltage and second input power are disregarded. Instead, the main control module directly performs an inverse perturbation on the first input voltage to obtain a third input voltage. For example, the main control module subtracts a perturbation step size from the first input voltage to obtain the third input voltage (i.e., third input voltage = first input voltage - perturbation step size). The main control module then determines the third input power based on the third input voltage. Specifically, the main control module determines the third input power based on the third input voltage and the real-time measured PV input current. For example, based on the power formula (power = voltage × current), the main control module can multiply the third input voltage by the real-time measured PV input current to obtain the third input power.

[0098] After receiving the first and third input powers, the main control module compares them. If the first input power is less than the third, the perturbation process is in the correct direction and can continue in that direction. If the first input power is greater than the third, the perturbation process is in the wrong direction and must be reversed.

[0099] If the main control module determines that the first input power is less than the third input power, the main control module will continue to perform reverse perturbation processing, and the main control module will continue to perform reverse perturbation processing based on the previous reverse perturbation processing. The main control module will update the value of the first input voltage to the value of the third input voltage, that is, the main control module will assign the value of the third input voltage to the first input voltage to complete the update of the first input voltage. Moreover, after completing the update of the first input voltage, the main control module will also clear the third input voltage at this time, waiting for the next reverse perturbation processing on the first input voltage to obtain the third input voltage again. That is, when the first input power is less than the third input power, the main control module will update the value of the first input voltage to the value of the third input voltage, determine the first input power based on the first input voltage, and execute the steps of performing reverse perturbation processing on the first input voltage to obtain the third input voltage, and determine the third input power based on the third input voltage. In other words, the main control module will perform reverse perturbation processing multiple times so that the third input voltage gradually approaches the voltage corresponding to the maximum photovoltaic output power.

[0100] The main control module can record the number of reverse disturbance processes and determine whether the number of reverse disturbance processes is equal to a second preset number. When the number of reverse disturbance processes reaches the second preset number, the third input voltage will infinitely approach the voltage corresponding to the maximum photovoltaic output power, that is, the third input voltage can be regarded as equal to the voltage corresponding to the maximum photovoltaic output power. The second preset number can be set according to actual conditions. When the number of reverse disturbance processes is equal to the second preset number, the main control module can determine the third input voltage as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0101] In a preferred embodiment, since the photovoltaic power-voltage (PV) curve exhibits a unimodal characteristic, the maximum power point (MPP) is the peak point on the curve. To the left of the MPP (voltage below the MPP), power increases with increasing voltage; to the right of the MPP (voltage above the MPP), power decreases with increasing voltage. Therefore, when the first input voltage falls to the right of the MPP, multiple reverse perturbation processes can be performed to determine whether the third input voltage corresponds to the PV output voltage corresponding to the PV maximum output power. For example, during the reverse perturbation process, if the first input power is less than the third input power, the reverse perturbation process continues until the first input power exceeds the third input power. At this point, it is determined that the number of reverse perturbation processes has exceeded a second predetermined number, and the third input voltage obtained from the previous reverse perturbation process can be determined as the PV output voltage corresponding to the PV maximum output power. In this embodiment, the second predetermined number can be determined based on a comparison between the first input power and the third input power.

[0102] In a preferred embodiment, the photovoltaic input voltage can be first subjected to a forward perturbation and then subjected to a reverse perturbation process to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power; or the photovoltaic input voltage can be first subjected to a reverse perturbation and then subjected to a forward perturbation process to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power. For example, when the first input voltage falls on the left side of the MPP, the first input voltage can be first subjected to a forward perturbation process. If the input power obtained after the process increases, the forward perturbation process is continued; if the input power obtained after the process decreases, the reverse perturbation process is performed to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power. Vice versa, when the first input voltage falls on the right side of the MPP, the first input voltage can be first subjected to a reverse perturbation process. If the input power obtained after the process increases, the reverse perturbation process is continued; if the input power obtained after the process decreases, the forward perturbation process is performed to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0103] In some embodiments, the aforementioned method of performing forward or reverse perturbation processing on the photovoltaic input voltage using the MPPT algorithm to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power includes:

[0104] Continuously obtain work instructions for disturbance handling;

[0105] After obtaining the disturbance processing work instruction, the step of performing forward disturbance or reverse disturbance processing on the photovoltaic input voltage using the MPPT algorithm is executed to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

[0106] In this embodiment, the main control module must first receive a work instruction before executing step S130. The main control module also has remote communication capabilities. For example, the main control module may be equipped with an RS485 communication unit, which allows for remote communication. For example, a user can send a work instruction to the main control module via a user terminal, causing the main control module to operate according to the work instruction. In this embodiment, the user terminal can control whether the main control module charges the energy storage battery.

[0107] For example: After the main control module determines that the photovoltaic input voltage is within the preset voltage range, it can send the detection result to the user terminal to inform the user terminal that the photovoltaic input voltage meets the voltage requirements for charging the energy storage battery. At this time, the user can determine whether to charge the energy storage battery through the user terminal. If the user determines to charge the energy storage battery through the user terminal, a charging work instruction will be sent through the user terminal. Since the photovoltaic input voltage needs to be disturbed before charging the energy storage battery, the charging work instruction can be a disturbance processing work instruction. The main control module will continuously obtain the disturbance processing work instruction. After obtaining the disturbance processing work instruction, the main control module will use the MPPT algorithm to perform forward or reverse disturbance processing on the photovoltaic input voltage to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power; and then charge the energy storage battery according to the photovoltaic output voltage.

[0108] In some embodiments, the aforementioned charging of the energy storage battery according to the photovoltaic output voltage includes:

[0109] Step S170, detecting whether the photovoltaic output voltage is the optimal charging voltage of the energy storage battery;

[0110] Step S171: If the photovoltaic output voltage is the optimal charging voltage, the energy storage battery is charged according to the photovoltaic output voltage;

[0111] Step S172: If the photovoltaic output voltage is not the optimal charging voltage, the photovoltaic output voltage is adjusted to adjust the photovoltaic output voltage to the optimal charging voltage.

[0112] In this embodiment, referring to Figure 4 When executing step S140, the main control module also first checks whether the photovoltaic output voltage obtained after disturbance processing meets the optimal charging voltage for the energy storage battery. Although the photovoltaic output voltage corresponding to the maximum photovoltaic output power can charge the energy storage battery, the photovoltaic output voltage corresponding to the maximum photovoltaic output power is not necessarily the optimal charging voltage for the energy storage battery. Therefore, the main control module also checks the photovoltaic output voltage to determine whether it meets the optimal charging voltage for the energy storage battery.

[0113] If the main control module determines that the photovoltaic output voltage is the optimal charging voltage, the main control module will charge the energy storage battery according to the photovoltaic output voltage. That is, if the photovoltaic output voltage is the optimal charging voltage for the energy storage battery, the main control module will directly charge the energy storage battery according to the photovoltaic output voltage.

[0114] If the main control module determines that the PV output voltage is not the optimal charging voltage, the main control module will first adjust the PV output voltage to the optimal charging voltage, and then charge the energy storage battery based on the adjusted PV output voltage. In other words, if the PV output voltage is not the optimal charging voltage for the energy storage battery, the main control module will first adjust the PV output voltage to the optimal charging voltage, and then charge the energy storage battery based on the adjusted PV output voltage.

[0115] In some embodiments, the aforementioned adjustment of the photovoltaic output voltage includes:

[0116] Step S180, determining whether the photovoltaic output voltage is greater than the optimal charging voltage;

[0117] Step S181: If the photovoltaic output voltage is greater than the optimal charging voltage, the photovoltaic output voltage is stepped down;

[0118] Step S182: If the photovoltaic output voltage is lower than the optimal charging voltage, the photovoltaic output voltage is boosted.

[0119] In this embodiment, referring to Figure 5 When the main control module executes step S172, the adjustment includes both step-down and step-up processing. The main control module may also include a DC-DC converter unit, which includes a boost unit and a buck unit. The main control module first determines whether the photovoltaic output voltage is greater than the optimal charging voltage. If the main control module determines that the photovoltaic output voltage is greater than the optimal charging voltage, it will step down the photovoltaic output voltage using the buck unit. If the main control module determines that the photovoltaic output voltage is less than the optimal charging voltage, it will step up the photovoltaic output voltage using the boost unit.

[0120] For example, the optimal charging voltage could be 58.8V. When the PV output voltage is greater than 58.8V, the main control module can use the Buck unit to step down the PV output voltage to 58.8V. Similarly, when the PV output voltage is less than 58.8V, the main control module can use the Boost unit to boost the PV output voltage to 58.8V.

[0121] In some embodiments, after the photovoltaic output voltage reaches the optimal charging voltage, the method further includes:

[0122] Step S190, determining the photovoltaic output current according to the photovoltaic output voltage;

[0123] Step S191, detecting whether the photovoltaic output current is a constant current;

[0124] Step S192: If the photovoltaic output current is a constant current, the energy storage battery is charged according to the photovoltaic output voltage and the photovoltaic output current.

[0125] In this embodiment, referring to Figure 6 After executing step S171, the main control module also detects the photovoltaic output current. The photovoltaic output current is determined based on the photovoltaic output voltage. Since the photovoltaic output voltage corresponds to the photovoltaic maximum output power, the maximum photovoltaic output power and the photovoltaic output voltage are obtained. Furthermore, the photovoltaic output current can be calculated using the power formula (power = voltage × current). In other words, the photovoltaic output current can be determined based on the photovoltaic output voltage and the maximum photovoltaic output power.

[0126] Charging energy storage batteries requires both stable voltage and current. This improves charging efficiency and extends the battery's lifespan. The main control module can detect whether the photovoltaic output current is constant.

[0127] If the PV output current is constant, the main control module will charge the energy storage battery according to the PV output voltage and PV output current. If the PV output current is not constant, the main control module will stop charging the energy storage battery.

[0128] In a preferred embodiment, the main control module detects whether the photovoltaic output current is constant and whether it meets the charging current requirements of the energy storage battery. Only after the photovoltaic output current is constant and meets the charging current requirements of the energy storage battery will the main control module charge the energy storage battery based on the photovoltaic output voltage and photovoltaic output current.

[0129] In some embodiments, the aforementioned 2000W photovoltaic intelligent MPPT power supply control method further includes:

[0130] Step S200, obtaining the battery voltage of the energy storage battery;

[0131] Step S201, determining whether the battery voltage is equal to a preset voltage;

[0132] Step S202: If the battery voltage is equal to the preset voltage, charging the energy storage battery is stopped.

[0133] In this embodiment, referring to Figure 7After executing step S140, the main control module will also determine whether the energy storage battery is fully charged. Since the battery voltage of the energy storage battery will gradually increase during the charging process of the energy storage battery; however, the battery voltage of the energy storage battery has a maximum value, and this maximum value can be set as a preset voltage. When charging the energy storage battery, when the battery voltage rises to the preset voltage, it can be regarded as the energy storage battery is fully charged and it is not appropriate to continue charging. The main control module first obtains the battery voltage of the energy storage battery, and then determines whether the battery voltage is equal to the preset voltage. If the main control module determines that the battery voltage is equal to the preset voltage, it can stop charging the energy storage battery. In a preferred embodiment, after the battery voltage is equal to the preset voltage, the energy storage battery can be charged with constant voltage for a period of time before stopping charging the energy storage battery.

[0134] In some embodiments, the aforementioned 2000W photovoltaic intelligent MPPT power supply control method further includes:

[0135] Step S210, obtaining the current flow direction of the energy storage battery;

[0136] Step S211, determining the current flow direction, where the current flow direction includes current flowing into the energy storage battery and current flowing out of the energy storage battery;

[0137] Step S212: If the current flows into the energy storage battery, the charging current sampling function is started;

[0138] In step S213 , if the current flows out of the energy storage battery, the discharge current sampling function is started.

[0139] In this embodiment, referring to Figure 8 The main control module can also sample the current. The main control module first obtains the current flow direction of the energy storage battery; then determines whether the current flow is flowing into the energy storage battery or flowing out of the energy storage battery; and determines whether the energy storage battery is in a charging state or a discharging state.

[0140] If the main control module determines that the current is flowing into the energy storage battery, it can be determined that the energy storage battery is in a charging state. At this time, the main control module will start the charging current sampling function to sample the charging current, thereby detecting the charging process of the energy storage battery in real time.

[0141] If the main control module determines that the current is flowing out of the energy storage battery, it can be determined that the energy storage battery is in a discharge state. At this time, the main control module will activate the discharge current sampling function to sample the discharge current, thereby detecting the discharge process of the energy storage battery in real time.

[0142] In a preferred embodiment, the main control module can also adjust the discharge voltage of the energy storage battery during discharge. The main control module can include a 12V step-down unit and a 24V step-down unit. The main control module can adjust the discharge voltage to 12V using the 12V step-down unit; the main control module can adjust the discharge voltage to 24V using the 24V step-down unit. The energy storage battery can also include a discharge interface that can power other devices. Discharge interfaces can include cigarette lighter interfaces, Type-C interfaces, and USB interfaces. The main control module adjusts the discharge voltage to 12V using the 12V step-down unit, and the 12V discharge voltage can power the cigarette lighter interface. The main control module adjusts the discharge voltage to 24V using the 24V step-down unit, and the 24V discharge voltage can power the Type-C interface and the USB interface.

[0143] The present invention also proposes a 2000W photovoltaic intelligent MPPT power control system. The 2000W photovoltaic intelligent MPPT power control system includes a 2000W photovoltaic and energy storage battery. The energy storage battery includes a main control module. The main control module is configured with an MPPT algorithm. The main control module can execute any of the above-mentioned 2000W photovoltaic intelligent MPPT power control methods.

[0144] In this embodiment, referring to Figure 9 The power control system for a 2000W photovoltaic intelligent MPPT system includes a 2000W photovoltaic system and an energy storage battery. The 2000W photovoltaic system is connected to the energy storage battery, allowing the electricity generated by the 2000W photovoltaic system to be transmitted to the energy storage battery, allowing the energy storage battery to store the electricity generated by the 2000W photovoltaic system. The energy storage battery includes a main control module, which is equipped with an MPPT algorithm and is capable of executing any of the above-mentioned 2000W photovoltaic intelligent MPPT power control methods.

[0145] The present invention processes the photovoltaic input voltage using the MPPT algorithm to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power, which is then used to charge the energy storage battery. The MPPT algorithm ensures that the photovoltaic input voltage generated during photovoltaic power generation is output at the photovoltaic output voltage corresponding to the maximum photovoltaic output power and charges the energy storage battery, thereby improving the charging efficiency of the energy storage battery and fully realizing the maximum efficiency of photovoltaic power generation. The invention also detects the discharge process of the energy storage battery and adjusts the discharge voltage, expanding the application scenarios of the energy storage battery.

[0146] The present invention also proposes a 2000W photovoltaic intelligent MPPT power supply control device, see Figure 10 , Figure 10 It is a structural diagram of a 2000W photovoltaic intelligent MPPT power supply control device in the hardware operating environment involved in the embodiment of the present invention.

[0147] The power control device of the 2000W photovoltaic intelligent MPPT in the embodiment of the present invention may be a processor capable of running the power control method of the 2000W photovoltaic intelligent MPPT; there is at least one processor. Figure 10 As shown, the 2000W photovoltaic intelligent MPPT power supply control device may include: a processor 1001 (e.g., a CPU), a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Communication bus 1002 is used to enable communication between these components. User interface 1003 may include a display and an input unit, such as a keyboard. Optionally, user interface 1003 may also include a standard wired interface or a wireless interface. Network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). Memory 1005 may be high-speed RAM or non-volatile memory, such as disk storage. Memory 1005 may also be a storage device independent of processor 1001.

[0148] Those skilled in the art will understand that Figure 10 The structure of the 2000W photovoltaic intelligent MPPT power supply control device shown in the figure does not constitute a limitation on the 2000W photovoltaic intelligent MPPT power supply control device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0149] like Figure 10 As shown, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module and a computer program.

[0150] exist Figure 10 In the 2000W photovoltaic intelligent MPPT power supply control device shown, the network interface 1004 is mainly used to connect to the background server and communicate data with the background server; the user interface 1003 is mainly used to connect to the client (user end) and communicate data with the client; and the processor 1001 can be used to call the computer program stored in the memory 1005. When the computer program is called and executed by the processor 1001, the steps of the above-mentioned 2000W photovoltaic intelligent MPPT power supply control method are implemented.

[0151] Based on the computer program proposed in the aforementioned embodiment, the present invention further proposes a storage medium storing the computer program. When the computer program is executed by a controller, the power supply control method of the 2000W photovoltaic intelligent MPPT described in the aforementioned embodiment is implemented.

[0152] The present invention also provides a storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the power supply control method of a 2000W photovoltaic intelligent MPPT as described in any one of the above technical solutions are implemented.

[0153] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A 2000W photovoltaic intelligent MPPT power supply control method for energy storage batteries, characterized in that: The power supply control method of the 2000W photovoltaic intelligent MPPT includes: Get the photovoltaic input voltage of the photovoltaic; detecting whether the photovoltaic input voltage is within a preset voltage range; If the photovoltaic input voltage is within the preset voltage range, the MPPT algorithm is used to perform forward or reverse perturbation processing on the photovoltaic input voltage to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power; charging the energy storage battery according to the photovoltaic output voltage, wherein the photovoltaic output voltage is the photovoltaic output voltage corresponding to the maximum photovoltaic output power; Charging the energy storage battery according to the photovoltaic output voltage includes: Detecting whether the photovoltaic output voltage is the optimal charging voltage of the energy storage battery; If the photovoltaic output voltage is the optimal charging voltage, charging the energy storage battery according to the photovoltaic output voltage; If the photovoltaic output voltage is not the optimal charging voltage, adjusting the photovoltaic output voltage so that the photovoltaic output voltage is adjusted to the optimal charging voltage; The adjusting the photovoltaic output voltage includes: Determining whether the photovoltaic output voltage is greater than the optimal charging voltage; If the photovoltaic output voltage is greater than the optimal charging voltage, the photovoltaic output voltage is stepped down; If the photovoltaic output voltage is lower than the optimal charging voltage, the photovoltaic output voltage is boosted; The photovoltaic output voltage is stepped down by the Buck unit, and stepped up by the Boost unit.

2. The power supply control method of the 2000W photovoltaic intelligent MPPT according to claim 1 is characterized in that: The method of performing forward disturbance or reverse disturbance processing on the photovoltaic input voltage by using the MPPT algorithm to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power includes: determining a first input voltage according to the photovoltaic input voltage, and determining a first input power according to the first input voltage; Performing a forward disturbance process on the first input voltage to obtain a second input voltage, and determining a second input power according to the second input voltage; comparing the magnitude relationship between the first input power and the second input power; If the first input power is less than the second input power, updating the value of the first input voltage to the value of the second input voltage, and performing the step of determining the first input power according to the first input voltage; The number of times the forward disturbance process is performed is determined. If the number of times the forward disturbance process is performed is equal to a first preset number, the second input voltage is determined as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

3. The power supply control method of the 2000W photovoltaic intelligent MPPT according to claim 2 is characterized in that: After comparing the first input power and the second input power, the method further includes: If the first input power is greater than the second input power, performing reverse perturbation processing on the first input voltage to obtain a third input voltage, and determining a third input power according to the third input voltage; comparing the magnitude relationship between the first input power and the third input power; If the first input power is less than the third input power, updating the value of the first input voltage to the value of the third input voltage, determining the first input power based on the first input voltage, performing reverse perturbation processing on the first input voltage to obtain a third input voltage, and determining the third input power based on the third input voltage; The number of times the reverse disturbance process is performed is determined. If the number of times the reverse disturbance process is equal to a second preset number, the third input voltage is determined as the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

4. The power supply control method of the 2000W photovoltaic intelligent MPPT according to claim 1 is characterized in that: The method of performing forward disturbance or reverse disturbance processing on the photovoltaic input voltage by using the MPPT algorithm to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power includes: Continuously obtain work instructions for disturbance handling; After the disturbance processing work instruction is obtained, the step of performing forward disturbance or reverse disturbance processing on the photovoltaic input voltage using the MPPT algorithm is executed to obtain the photovoltaic output voltage corresponding to the maximum photovoltaic output power.

5. The power supply control method of 2000W photovoltaic intelligent MPPT according to claim 1, characterized in that: After the photovoltaic output voltage reaches the optimal charging voltage, the method further includes: determining a photovoltaic output current according to the photovoltaic output voltage; detecting that the photovoltaic output current is a constant current; If the photovoltaic output current is a constant current, the energy storage battery is charged according to the photovoltaic output voltage and the photovoltaic output current.

6. The power supply control method of 2000W photovoltaic intelligent MPPT according to claim 1, characterized in that: The power supply control method of the 2000W photovoltaic intelligent MPPT further includes: Obtaining the battery voltage of the energy storage battery; Determining whether the battery voltage is equal to a preset voltage; If the battery voltage is equal to the preset voltage, charging of the energy storage battery is stopped.

7. The power supply control method of the 2000W photovoltaic intelligent MPPT according to claim 1, characterized in that: The power supply control method of the 2000W photovoltaic intelligent MPPT further includes: Obtaining the current flow direction of the energy storage battery; Determining the current flow direction, wherein the current flow direction includes current flowing into the energy storage battery and current flowing out of the energy storage battery; If the current flows into the energy storage battery, the charging current sampling function is started; If the current flows out of the energy storage battery, the discharge current sampling function is started.

8. A 2000W photovoltaic intelligent MPPT power control system, characterized in that: The power control system of the 2000W photovoltaic intelligent MPPT includes a 2000W photovoltaic and energy storage battery, the energy storage battery includes a main control module, the main control module is configured with an MPPT algorithm, and the main control module can execute the power control method of the 2000W photovoltaic intelligent MPPT according to any one of claims 1 to 7.

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