Overvoltage load reduction circuit, overvoltage load reduction method and storage medium

Abstract

The invention provides an overvoltage load reduction circuit, an overvoltage load reduction method and a storage medium, which can control the output power of an inverter when the inverter transmits the output electric energy to a farther load, and prevent the inverter from being shut down due to overvoltage when the voltage of the output side of the inverter is too high, thereby affecting the transmission of the electric energy. The overvoltage load reduction circuit comprises a load reduction module, a sampling module and a control module, wherein the load reduction module is used for adjusting the output power of the micro inverter; the sampling module is used for sampling actual voltage and actual current of an external actual load input end; and the control module is used for determining the target output power of the micro inverter according to the actual voltage and the actual current, and controlling the load reduction module to adjust the output power of the micro inverter to the target output power.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic grid-connected inverters, and in particular to an overvoltage load reduction circuit, an overvoltage load reduction method, and a storage medium. Background Art

[0002] In a photovoltaic system, after the solar panels convert solar energy into electrical energy, the electrical energy will be transmitted to different places as needed. When the electrical energy needs to be transmitted to a distant place, the line impedance will increase due to the long distance. According to Ohm's law, the voltage on the output side of the inverter will increase as the line impedance increases. If the output side voltage is too high, the inverter will shut down due to overvoltage protection, thus affecting the transmission of electrical energy. Summary of the invention

[0003] The advantage of the present application is that it provides an overvoltage load reduction circuit, an overvoltage load reduction method and a storage medium to control the output power of the micro inverter, thereby preventing the inverter from shutting down due to overvoltage protection when the output side voltage of the micro inverter is too high, thereby affecting the transmission of electric energy.

[0004] Based on this, in order to achieve at least one of the above advantages or other advantages and purposes of the present application, the present application provides an overvoltage load reduction circuit, including:

[0005] load reduction module, sampling module and control module, wherein:

[0006] The first input end of the load reduction module is connected to the output end of the external micro-inverter module, and is used to adjust the output power of the micro-inverter. The output end of the load reduction module is connected to the input end of the external actual load. The micro-inverter is used to convert the direct current of the solar cell into alternating current and output it. The input end of the micro-inverter is connected to the output end of the external solar cell.

[0007] The sampling module is used to sample the actual voltage and actual current of the external actual load input terminal;

[0008] The input end of the control module is connected to the output end of the sampling module, and the output end of the control module is connected to the second input end of the load reduction module. The control module is used to determine the target output power of the micro inverter according to the actual voltage and the actual current, and control the load reduction module to adjust the output power of the micro inverter to the target output power.

[0009] In this arrangement, the actual voltage and actual current at the external actual load input terminal are sampled through the sampling module, and the sampled data are sent to the control module for processing, so as to determine the target output power of the micro-inverter under the current circumstances, and control the load reduction module to adjust the output power of the external micro-inverter to the target output power. Through the cooperation of the sampling module, the control module and the load reduction module, the output power of the micro-inverter can be accurately controlled and adjusted, the system efficiency, stability and reliability can be improved, the actual load and the micro-inverter can be protected, the energy utilization can be optimized, and flexible expansion and upgrade capabilities can be provided.

[0010] According to one embodiment of the present application, the sampling module includes a sampling sensor and a signal conditioning circuit, the sampling sensor is connected to the actual load and is used to collect the actual voltage and actual current at the input end of the actual load; the signal conditioning circuit is connected to the sampling sensor and is used to condition the actual voltage and actual current collected by the sampling sensor, and transmit the conditioned actual voltage and actual current to the control module.

[0011] In this way, the signal conditioning circuit is used to condition the actual voltage and actual current collected by the sampling sensor, and transmit the conditioned actual voltage and actual current to the control module. Compared with the solution without the signal conditioning circuit, the actual voltage and actual current collected by the sampling sensor are directly transmitted to the control module. The solution of setting the signal conditioning circuit can condition the collected actual voltage and actual current to make the collected actual voltage and actual current purer, which can help improve the quality of the signal, enhance the anti-interference ability of the signal, optimize subsequent processing, improve data storage and transmission, not only improve the reliability of the signal, but also improve the accuracy of the signal, and also lay the foundation for the subsequent efficient data processing and analysis.

[0012] According to another aspect of the present application, the present application further provides an overvoltage load reduction method, which is applied to the above-mentioned overvoltage load reduction circuit, and the method comprises the following steps:

[0013] S1, samples the voltage and current of the load, obtains the current sampled voltage and current, and calculates the actual power of the actual load;

[0014] S2, obtaining a target power corresponding to the current sampling voltage according to a mapping relationship between the current sampling voltage and a preset sampling voltage and target power, wherein in the mapping relationship between the preset sampling voltage and the target power, the target power tends to decrease as the sampling voltage increases;

[0015] S3, using the MPPT conductivity increment method to track the actual power, and adjust the actual power to the target power.

[0016] In this way, the actual power of the actual load is obtained through the current sampled voltage and the current sampled current, and then the target power corresponding to the current sampled voltage is obtained according to the mapping relationship between the preset sampled voltage and the target power. Finally, the actual power is adjusted to the target power. Compared with the scheme that does not adjust the actual power of the actual load, this scheme can effectively prevent the inverter from shutting down due to overvoltage protection caused by excessive output voltage by controlling the output power of the micro inverter, and ensure that the electric energy can be stably delivered to the actual load. This can not only protect the equipment from damage and extend the life of the equipment, but also improve the stability and reliability of the power transmission system, reduce maintenance costs, and avoid the interruption of power transmission.

[0017] According to one embodiment of the present application, the step S2 further includes the following steps:

[0018] S21, comparing the sampled voltage with a preset voltage drop threshold value V1, if the sampled voltage is greater than the preset voltage drop threshold value V1, executing S22, otherwise executing S3;

[0019] S22, calculating the difference between the target power and the actual power, and comparing the difference with the preset proportion of the rated power P1, determining that the response time is the preset first response time T1 or the preset first response time T2, if the difference is less than the preset proportion of the rated power P1, determining the response time to be T1, if the difference is greater than or equal to the preset proportion of the rated power P1, determining the response time to be T2, and T1<T2;

[0020] S23, calculating the power step length of the voltage change according to T1 or T2.

[0021] Compared with the solution without setting the power step of voltage change, setting the power step of voltage change helps to optimize the output power regulation of the micro inverter. Through fine step control, it can ensure that the system can respond quickly and stably when the voltage fluctuates, avoid overshoot and oscillation, improve energy utilization efficiency, and protect the transmission system and actual load from voltage mutations. It can improve the overall performance and stability of the transmission system and reduce the failure rate of equipment.

[0022] According to an embodiment of the present application, the process of S3 is specifically as follows:

[0023] The actual power is tracked by using the MPPT conductivity increment method, and it is determined whether there is a power step of voltage change. If there is a power step of voltage change, the actual power is adjusted according to the power step of voltage change until the actual power is equal to the target power. If there is no power step of voltage change, the actual power is directly adjusted until the actual power is equal to the target power.

[0024] With such a setting, by using the MPPT conductivity increment method to compare the conductivity increment between the current conductivity value and the conductivity value at the previous moment, it is determined whether the actual power is close to the target power. When the conductivity increment is close to zero, it indicates that the target power has been reached. Regardless of whether there is a power step with voltage change, the actual power can be accurately tracked, thereby achieving precise power regulation, thereby reducing the error of power regulation and improving the accuracy of power regulation.

[0025] According to an embodiment of the present application, in the mapping relationship between the preset sampling voltage and the target power, when 0<the sampling voltage≤voltage load reduction threshold V1, the target power is equal to the rated power P1.

[0026] In this case, the value of the sampled voltage is within a safe range, so when 0 < the sampled voltage ≤ the voltage load reduction threshold V1, the target power corresponding to the sampled voltage is equal to the rated power P1, compared to 0 < the sampled voltage ≤ the voltage load reduction threshold V1, when the target power is set to be less than the rated power P1. Under the premise of safety, this solution outputs a larger target power, improves the efficiency of electric energy use, reduces the loss of electric energy, and thus improves the overall efficiency of the power transmission system.

[0027] According to one embodiment of the present application, in the mapping relationship between the preset sampling voltage and the target power, when the voltage load reduction threshold V1≤the sampling voltage≤the voltage load reduction cut-off threshold VH, the sampling voltage and the target power are in a linear relationship, and when the sampling voltage is the voltage load reduction threshold V1, the target power is the rated power P1, and when the sampling voltage is the voltage load reduction cut-off threshold VH, the target power is equal to the cut-off power P2.

[0028] With such a configuration, when the voltage load shedding threshold V1≤the sampled voltage≤the voltage load shedding cut-off threshold VH, the sampled voltage and the target power are in a linear relationship. Compared with a scheme in which the sampled voltage and the target power are in a curved relationship, the scheme in which the linear relationship is set can quickly and accurately determine the target power corresponding to the current sampled voltage. In addition, within the range of the voltage load shedding threshold V1≤the sampled voltage≤the voltage load shedding cut-off threshold VH, as the sampled voltage increases, the target power also decreases proportionally, and the magnitude of the decrease will not be too fast or too slow, and the present scheme is more stable.

[0029] According to an embodiment of the present application, in the mapping relationship between the preset sampling voltage and the target power, when the voltage load reduction cutoff threshold VH≤the sampling voltage<voltage protection threshold V2, the target power is equal to the cutoff power P2.

[0030] In this way, compared with the scheme in which the target power still decreases as the sampling voltage increases within the range of the voltage load reduction cut-off threshold VH ≤ the sampling voltage < the voltage protection threshold V2, the present scheme sets the target power to a constant cut-off power P2. Many electrical devices require a stable power supply to work normally. If the power is too low, the device may experience unstable operation, such as frequent restarts, performance degradation, or even failure to start normally. Therefore, setting the target power to a constant cut-off power P2 can prevent the occurrence of safety hazards caused by too low output power.

[0031] According to an embodiment of the present application, in the mapping relationship between the preset sampling voltage and the target power, when the sampling voltage ≥ the voltage protection threshold V2, the target power is zero.

[0032] In this way, when the sampled voltage is greater than or equal to the voltage protection threshold V2, in order to prevent the actual load from being damaged due to excessive voltage, the target power in this case is set to zero, and the actual load is protected from overvoltage to prevent the actual load from being damaged, thereby improving the overall efficiency of the power transmission system.

[0033] According to another aspect of the present application, the present application further provides a storage medium, wherein the storage medium includes a stored program.

[0034] Wherein, when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned overvoltage load reduction method.

[0035] With such a configuration, the program stored in the storage medium can automatically perform complex tasks, reduce human intervention, thereby improving overall efficiency and ensuring the reliability and trustworthiness of operations. In addition, the program is repeatable and extensible, so that the same program can be repeatedly executed in different environments and at different times, and is easy to expand to meet new needs, thereby enhancing the adaptability and flexibility of the program. In addition, running the program can greatly optimize resource utilization and reduce manpower and error costs by automating the processing of large amounts of data and tasks. Finally, the program is also traceable and secure, and can ensure the auditability and security of operations by recording and tracking each step of program execution, thereby reducing the risks brought about by human operations.

[0036] Beneficial effects: The present application provides an overvoltage load reduction circuit, an overvoltage load reduction method and a storage medium, wherein the overvoltage load reduction circuit comprises: a load reduction module, a sampling module and a control module. The overvoltage load reduction method samples the voltage and current outputted by the micro inverter to the actual load through the sampling module, obtains the actual power and target power of the actual load through the control module, and controls the load reduction module to adjust the actual power to the target power. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic diagram of the connection between an overvoltage load reduction circuit provided in one embodiment of the present application and an external solar cell, an inverter and an actual load;

[0039] Figure 2 A schematic flow chart of an overvoltage load reduction method provided in another embodiment of the present application;

[0040] Figure 3 A schematic flow chart of an overvoltage load reduction method provided for other embodiments of the present application;

[0041] Figure 4 A schematic diagram showing a mapping relationship between a preset sampling voltage and a target power in an overvoltage load reduction method according to another embodiment of the present application and other embodiments is shown.

[0042] Figure numerals: 10, overvoltage load reduction circuit; 11, sampling module; 12, control module; 13, load reduction module. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] Considering that when the inverter transmits the output electric energy to a load at a distance, the line impedance will increase due to the long distance. According to Ohm's law, the voltage on the output side of the inverter will increase as the line impedance increases. If the voltage on the output side of the inverter is too high, the inverter will shut down due to overvoltage protection, thereby affecting the transmission of electric energy. In order to solve this problem, the present application provides an overvoltage load reduction circuit, an overvoltage load reduction method, and a storage medium, which can adjust the power on the output side of the inverter, thereby preventing the inverter from shutting down due to overvoltage protection, thereby affecting the transmission of electric energy.

[0045] Specifically, Figure 1 As shown, an embodiment of the present application provides an overvoltage load reduction circuit 10 , which may include: a load reduction module 13 , a sampling module 11 and a control module 12 .

[0046] More specifically, if Figure 1 As shown, the first input end of the load reduction module 13 is connected to the output end of the external micro-inverter module, and is used to adjust the output power of the micro-inverter. The output end of the load reduction module 13 is connected to the input end of the external actual load. The micro-inverter is used to convert the direct current of the solar cell into alternating current and output it. The input end of the micro-inverter is connected to the output end of the external solar cell.

[0047] The sampling module 11 is used to sample the actual voltage and actual current of the external actual load input terminal;

[0048] The input end of the control module 12 is connected to the output end of the sampling module 11, and the output end of the control module 12 is connected to the second input end of the load reduction module 13. The control module 12 is used to determine the target output power of the micro inverter according to the actual voltage and the actual current, and control the load reduction module 13 to adjust the output power of the micro inverter to the target output power.

[0049] It is worth noting that the above scheme uses the sampling module 11 to sample the actual voltage and actual current of the external actual load input terminal, and sends the sampled data to the control module 12 for processing, determines the target output power of the micro-inverter under the current circumstances, and controls the load reduction module 13 to adjust the output power of the external micro-inverter to the target output power. Through the cooperation of the sampling module 11, the control module 12 and the load reduction module 13, the output power of the micro-inverter can be accurately controlled and adjusted, the system efficiency, stability and reliability can be improved, the actual load and micro-inverter can be protected, energy utilization can be optimized, and flexible expansion and upgrade capabilities can be provided.

[0050] In particular, the load reduction module 13 adjusts the power output of the device by controlling the on and off of the MOS tube and the thyristor. Specifically: Pulse Width Modulation (PWM): The output power is adjusted by changing the ratio (duty cycle) of the on time and off time of the MOS tube. For example, in a DC-DC converter, the output voltage and power can be accurately controlled by adjusting the PWM signal of the MOS tube; Phase control: In an AC circuit, the average output power can be adjusted by controlling the on phase angle of the thyristor in each cycle. For example, in a dimming circuit, the brightness of the bulb can be changed by controlling the on time of the thyristor.

[0051] Optionally, the sampling module 11 includes a sampling sensor and a signal conditioning circuit, the sampling sensor is connected to the actual load, and is used to collect the actual voltage and actual current at the input end of the actual load; the signal conditioning circuit is connected to the sampling sensor, and is used to condition the actual voltage and actual current collected by the sampling sensor, and transmit the conditioned actual voltage and actual current to the control module 12.

[0052] In particular, the process of conditioning the collected actual voltage and actual current includes but is not limited to filtering, signal amplification and signal digitization processing.

[0053] Specifically: filtering means eliminating or weakening the unwanted components in the signal and retaining or enhancing the useful components through specific circuits or algorithms. Its purpose is usually to remove noise, interference or other unwanted frequency components to make the signal purer. For example, in audio processing, a low-pass filter can be used to remove high-frequency noise, while a high-pass filter can be used to enhance high-frequency signals.

[0054] Signal amplification refers to increasing the amplitude of a signal through a specific amplifier circuit or device so that it can be effectively received and processed by subsequent processing circuits or devices. Its purpose is usually to increase the strength of the signal to a desired signal level. For example, in a radio transmitter, signal amplification is used to enhance the signal output by the transmitter so that it can be transmitted over long distances.

[0055] Signal digitization refers to converting analog signals into digital signals through an analog-to-digital converter (ADC), and then processing and analyzing them through digital signal processing (DSP) technology. Its purpose is usually to use the advantages of digital technology (such as programmability, accuracy, and anti-interference) to achieve signal enhancement, compression, storage, transmission, and analysis. For example, in digital audio processing, signal digitization is used to achieve the recording, editing, and playback of audio signals.

[0056] It is worth noting that the signal conditioning circuit is used to condition the actual voltage and actual current collected by the sampling sensor, and transmit the conditioned actual voltage and actual current to the control module 12. Compared with the solution without the signal conditioning circuit, the actual voltage and actual current collected by the sampling sensor are directly transmitted to the control module 12. The solution of setting the signal conditioning circuit can help improve the quality of the signal, enhance the anti-interference ability of the signal, optimize subsequent processing, and improve data storage and transmission. It not only improves the reliability and accuracy of the signal, but also lays the foundation for subsequent efficient data processing and analysis.

[0057] Another embodiment of the present application provides an overvoltage load reduction method, such as Figure 2 As shown, the method is applied to the above-mentioned overvoltage load reduction circuit 10, and includes the following steps:

[0058] S1, samples the voltage and current of the load, obtains the current sampled voltage and current, and calculates the actual power of the actual load;

[0059] In particular, the actual power in this solution only considers the active power and is calculated from the sampled current value and voltage value: actual power = current sampled voltage × current sampled current.

[0060] S2, obtaining a target power corresponding to the current sampling voltage according to a mapping relationship between the current sampling voltage and a preset sampling voltage and target power, wherein in the mapping relationship between the preset sampling voltage and the target power, the target power tends to decrease as the sampling voltage increases;

[0061] S3, using the MPPT conductivity increment method to track the actual power, and adjust the actual power to the target power.

[0062] It is worth noting that the actual power of the actual load is obtained by sampling the current sampled voltage and the current sampled current, and then the target power corresponding to the current sampled voltage is obtained according to the mapping relationship between the preset sampled voltage and the target power, and finally the actual power is adjusted to the target power. Compared with the scheme that does not adjust the actual power of the actual load, this scheme can effectively prevent the inverter from shutting down due to overvoltage protection caused by excessive output voltage by controlling the output power of the micro inverter, and ensure that the electric energy can be stably delivered to the actual load. This can not only protect the equipment from damage and extend the life of the equipment, but also improve the stability and reliability of the power transmission system, reduce maintenance costs, and avoid the interruption of power transmission.

[0063] It is worth noting that Figure 4 As shown, the mapping relationship between the preset sampling voltage and the target power includes a voltage load reduction threshold V1, a voltage load reduction cut-off threshold VH, a voltage protection threshold V2, a rated power P1, and a cut-off power P2. Among them, the voltage load reduction threshold V1 is a preset voltage threshold. When the sampling voltage is greater than V1, the target power tends to decrease as the sampling voltage increases; the voltage load reduction cut-off threshold VH is a preset voltage threshold. When the sampling voltage is greater than VH, the target power is a constant value; the voltage protection threshold V2 is a preset voltage threshold. When the sampling voltage ≥ the voltage protection threshold V2, the target power is 0; the rated power P1 is the maximum power that can be output by the inverter output terminal; the cut-off power P2 is the minimum power that can be output by the inverter output terminal after being adjusted by the overvoltage load reduction method.

[0064] In particular, other embodiments of the present application provide an overvoltage load reduction method, such as Figure 3 As shown, the step S2 further includes the following steps:

[0065] S21, comparing the sampled voltage with a preset voltage drop threshold value V1, if the sampled voltage is greater than the preset voltage drop threshold value V1, executing S22, otherwise executing S3;

[0066] S22, calculating the difference between the target power and the actual power, and comparing the difference with the preset proportion of the rated power P1, determining that the response time is the preset first response time T1 or the preset first response time T2, if the difference is less than the preset proportion of the rated power P1, determining the response time to be T1, if the difference is greater than or equal to the preset proportion of the rated power P1, determining the response time to be T2, and T1<T2;

[0067] S23, calculating the power step length of the voltage change according to T1 or T2.

[0068] It is worth noting that compared with the solution without setting the power step of voltage change, setting the power step of voltage change helps to optimize the output power regulation of the micro inverter. Through fine step control, it can ensure that the system can respond quickly and stably when the voltage fluctuates, avoid overshoot and oscillation, and improve energy utilization efficiency. At the same time, it can protect the transmission system and actual loads from the impact of voltage mutations, which can improve the overall performance and stability of the transmission system and reduce the failure rate of equipment.

[0069] In particular, the setting of the preset first response time T1 or the preset first response time T2 is not only set according to the performance of the micro inverter, but also refers to the following formula,

[0070]

[0071] Among them, T is the response time, R is the resistance of the actual load, C is the capacitor at the output end of the micro inverter, V0 is the initial voltage value on the capacitor, V1 is the maximum voltage of the capacitor, and Vt is the voltage value on the capacitor at the current moment.

[0072] Optionally, the preset proportion of the rated power P1 may be set according to the performance and environment of different inverters. In this embodiment, the preset proportion of the rated power P1 is 5% of the rated power P1.

[0073] In particular, the power step length of the voltage change is calculated as follows: power step length of the voltage change=part of the rated power P1 / response time, which in this embodiment is: power step length of the voltage change=5% P1 / response time.

[0074] In particular, the process of S3 is specifically as follows:

[0075] The actual power is tracked by using the MPPT conductivity increment method, and it is determined whether there is a power step of voltage change. If there is a power step of voltage change, the actual power is adjusted according to the power step of voltage change until the actual power is equal to the target power. If there is no power step of voltage change, the actual power is directly adjusted until the actual power is equal to the target power.

[0076] In particular, the MPPT conductivity increment method is an efficient and accurate MPPT algorithm. By comparing the current conductivity value with the conductivity increment at the previous moment, the working point of the photovoltaic array is dynamically adjusted to keep it at the maximum power point (MPP). In the overvoltage load reduction method provided in this embodiment, the target power is set to the maximum power point, thereby maximizing the output power of the photovoltaic system. The conductivity increment method has the advantages of fast response, high precision and adaptability, and is widely used in photovoltaic power generation fields such as photovoltaic inverters, solar charge controllers and microgrid systems.

[0077] It is worth noting that S3 uses the MPPT conductivity increment method to compare the conductivity increment between the current conductivity value and the conductivity value at the previous moment to determine whether the actual power is close to the target power. When the conductivity increment is close to zero, it indicates that the target power has been reached. Regardless of whether there is a power step with voltage changes, the actual power can be accurately tracked, thereby achieving precise power regulation, thereby reducing the error of power regulation and improving the accuracy of power regulation.

[0078] Alternatively, if Figure 4 As shown, in the mapping relationship between the preset sampling voltage and the target power, when 0<the sampling voltage≤voltage load reduction threshold V1, the target power is equal to the rated power P1.

[0079] It is worth noting that in this case, the value of the sampled voltage is within a safe range, so when 0<the sampled voltage≤voltage load reduction threshold V1, the target power corresponding to the sampled voltage is equal to the rated power P1, compared with 0<the sampled voltage≤voltage load reduction threshold V1, setting the target power less than the rated power P1, this solution outputs a larger target power under the premise of safety, and improves the efficiency of electric energy use. Reduce the loss of electric energy, thereby improving the overall efficiency of the power transmission system.

[0080] Alternatively, if Figure 4 As shown, in the mapping relationship between the preset sampling voltage and the target power, when the voltage load reduction threshold V1≤the sampling voltage≤the voltage load reduction cut-off threshold VH, the sampling voltage and the target power are in a linear relationship, and when the sampling voltage is the voltage load reduction threshold V1, the target power is the rated power P1, and when the sampling voltage is the voltage load reduction cut-off threshold VH, the target power is the cut-off power P2.

[0081] It is worth noting that, when the voltage load reduction threshold V1≤the sampling voltage≤the voltage load reduction cut-off threshold VH, the sampling voltage and the target power are in a linear relationship. Compared with the scheme in which the sampling voltage and the target power are in a curved relationship, the scheme in which a linear relationship is set can quickly and accurately determine the target power corresponding to the current sampling voltage. In addition, within the range of the voltage load reduction threshold V1≤the sampling voltage≤the voltage load reduction cut-off threshold VH, as the sampling voltage increases, the target power also decreases proportionally, and the magnitude of the decrease will not be too fast or too slow, and this scheme is more stable.

[0082] Alternatively, if Figure 4As shown, in the mapping relationship between the preset sampling voltage and the target power, when the voltage load reduction cut-off threshold VH≤the sampling voltage<voltage protection threshold V2, the target power is equal to the cut-off power P2.

[0083] It is worth noting that compared with the solution in which the target power still decreases as the sampling voltage increases within the range of the voltage load reduction cut-off threshold VH ≤ the sampling voltage < the voltage protection threshold V2, the present solution sets the target power to a constant cut-off power P2. Many electrical equipment require a stable power supply to work properly. If the power is too low, the equipment may experience unstable operation, such as frequent restarts, performance degradation, or even failure to start normally. Therefore, setting the target power to a constant cut-off power P2 can prevent the occurrence of safety hazards caused by too low output power.

[0084] Alternatively, if Figure 4 As shown, in the mapping relationship between the preset sampling voltage and the target power, when the sampling voltage ≥ the voltage protection threshold V2, the target power is zero.

[0085] It is worth noting that when the sampled voltage is greater than or equal to the voltage protection threshold V2, in order to prevent the actual load from being damaged due to excessive voltage, the target power in this case is set to zero, and the actual load is protected from overvoltage to prevent damage to the actual load, thereby improving the overall efficiency of the power transmission system.

[0086] In other embodiments of the present application, a computer program is provided, and running the computer program can execute the above-mentioned overvoltage load reduction method.

[0087] Other embodiments of the present application further provide a storage device, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned overvoltage load reduction method.

[0088] It is worth noting that the program stored in the storage medium can automatically perform complex tasks, reduce human intervention, thereby improving overall efficiency and ensuring the reliability and trustworthiness of operations. In addition, the program is repeatable and extensible, so that the same program can be repeatedly executed in different environments and times, and is easy to expand to meet new needs, enhancing the adaptability and flexibility of the program. In addition, running the program can greatly optimize resource utilization and reduce manpower and error costs by automating the processing of large amounts of data and tasks. Finally, the program is also traceable and secure, and can ensure the auditability and security of operations by recording and tracking every step of the program execution, reducing the risks brought by human operations.

[0089] In other embodiments of the present application, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned overvoltage load reduction method when executing the computer program.

[0090] It is worth noting that the computer program is flexible and adaptable, so that the execution steps can be adjusted according to different inputs and conditions, so as to adapt to the ever-changing needs and technical environment, and maintain the advancement and practicality of the computer program. In addition, the architecture of the computer device allows the realization of multiple functions, so that the program in the memory can contain multiple functional modules, and the computer program can be executed by the processor to meet different application needs, thereby improving the function of the computer program and enhancing the integration of the computer device.

[0091] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0092] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, device, product or equipment that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0093] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0094] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used 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 the specification of this application includes any and all combinations of one or more related listed items.

[0095] The technical features of the above embodiments can be combined without changing the basic principles of the present application. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An overvoltage load reduction circuit, characterized in that: include: load reduction module, sampling module and control module, wherein: The first input end of the load reduction module is connected to the output end of the external micro-inverter module, and is used to adjust the output power of the micro-inverter. The output end of the load reduction module is connected to the input end of the external actual load. The micro-inverter is used to convert the direct current of the solar cell into alternating current and output it. The input end of the micro-inverter is connected to the output end of the external solar cell. The sampling module is used to sample the actual voltage and actual current of the external actual load input terminal; The input end of the control module is connected to the output end of the sampling module, and the output end of the control module is connected to the second input end of the load reduction module. The control module is used to determine the target output power of the micro inverter according to the actual voltage and the actual current, and control the load reduction module to adjust the output power of the micro inverter to the target output power.

2. The overvoltage load reduction circuit according to claim 1, characterized in that: The sampling module includes a sampling sensor and a signal conditioning circuit. The sampling sensor is connected to the actual load and is used to collect the actual voltage and actual current at the input end of the actual load. The signal conditioning circuit is connected to the sampling sensor and is used to condition the actual voltage and actual current collected by the sampling sensor and transmit the conditioned actual voltage and actual current to the control module.

3. An overvoltage load reduction method, characterized in that: Applied to the overvoltage load reduction circuit described in any one of claims 1 to 2, the method comprises the following steps: S1, samples the voltage and current of the load, obtains the current sampled voltage and current, and calculates the actual power of the load; S2, obtaining a target power corresponding to the current sampling voltage according to a mapping relationship between the current sampling voltage and a preset sampling voltage and target power, wherein in the mapping relationship between the preset sampling voltage and the target power, the target power tends to decrease as the sampling voltage increases; S3, using the MPPT conductivity increment method to track the actual power, and adjust the actual power to the target power.

4. The overvoltage load reduction method according to claim 3, characterized in that: The step S2 further includes the following steps: S21, comparing the sampled voltage with a preset voltage drop threshold value V1, if the sampled voltage is greater than the preset voltage drop threshold value V1, executing S22, otherwise executing S3; S22, calculating the difference between the target power and the actual power, and comparing the difference with a preset proportion of the rated power P1, determining that the response time is a preset first response time T1 or a preset first response time T2, if the difference is less than the preset proportion of the rated power P1, determining that the response time is T1, if the difference is greater than or equal to the preset proportion of the rated power P1, determining that the response time is T2, and T1 is less than T2; S23, calculating the power step length of the voltage change according to T1 or T2.

5. The overvoltage load reduction method according to claim 4, characterized in that: The process of S3 is specifically as follows: The actual power is tracked by using the MPPT conductivity increment method, and it is determined whether there is a power step of voltage change. If there is a power step of voltage change, the actual power is adjusted according to the power step of voltage change until the actual power is equal to the target power. If there is no power step of voltage change, the actual power is directly adjusted until the actual power is equal to the target power.

6. The overvoltage load reduction method according to claim 3, characterized in that: In the mapping relationship between the preset sampling voltage and the target power, when 0<the sampling voltage≤voltage load reduction threshold V1, the target power is equal to the rated power P1.

7. The overvoltage load reduction method according to claim 6, characterized in that: In the mapping relationship between the preset sampling voltage and the target power, when the voltage load reduction threshold V1≤the sampling voltage≤the voltage load reduction cut-off threshold VH, the sampling voltage and the target power are in a linear relationship, and when the sampling voltage is the voltage load reduction threshold V1, the target power is the rated power P1, and when the sampling voltage is the voltage load reduction cut-off threshold VH, the target power is equal to the cut-off power P2.

8. The overvoltage load reduction method according to claim 7, characterized in that: In the mapping relationship between the preset sampling voltage and the target power, when the voltage load reduction cut-off threshold VH≤the sampling voltage<voltage protection threshold V2, the target power is equal to the cut-off power P2.

9. The overvoltage load reduction method according to claim 8, characterized in that: In the mapping relationship between the preset sampling voltage and the target power, when the sampling voltage ≥ the voltage protection threshold V2, the target power is zero.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the overvoltage load reduction method described in any one of claims 3 to 9.

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