Photovoltaic voltage control method and system based on adaptive dichotomy

Abstract

The invention discloses a photovoltaic voltage control method and system based on a self-adaptive dichotomy, and the method comprises the steps: determining a self-adaptive step size adjustment coefficient of the dichotomy according to a voltage error, and obtaining the power adjustment amount of a photovoltaic inverter through calculation; the output voltage gradually approaches the target voltage by dynamically adjusting the photovoltaic output power, and compared with a traditional fixed step length dichotomy, the self-adaptive dichotomy can flexibly change the step length according to the real-time voltage error, so that quick response can be realized under the condition of large voltage fluctuation, fine adjustment can be realized when the target voltage is approached, and the method is suitable for large-scale popularization and application. The risk of voltage out-of-limit or under-voltage is reduced to the greatest extent, the stability of the system is improved, and the accurate control of the photovoltaic output voltage is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic voltage control, and in particular to a photovoltaic voltage control method and system based on an adaptive dichotomy method, an electronic device, and a computer-readable storage medium. Background Art

[0002] With the continuous growth of electricity demand, the supply capacity of traditional energy is decreasing (non-renewable energy is decreasing), and the rapid development of new energy systems has become an effective solution to meet the current multi-faceted needs. Among them, photovoltaic power generation, as an important part of the clean energy field, provides key support for the transformation of the global energy structure by efficiently converting light energy into electrical energy. In order to adapt to this development trend, the traditional power grid has developed from a single "grid-load" structure to a "source-grid-load-storage" four-element structure. The system complexity continues to increase, and higher requirements are placed on the reliability and efficiency of power grid management. In the photovoltaic system, the inverter is the core component, and its main task is to convert the direct current generated by the photovoltaic module into alternating current. However, due to the dynamic changes of environmental factors such as light intensity and temperature, the stability and regulation ability of the photovoltaic system output voltage face severe challenges. In particular, when the photovoltaic module is shaded or the light intensity fluctuates violently, the voltage may fluctuate greatly, or even exceed the safe working range of the system, that is, the voltage is over-limit or under-voltage. This voltage abnormality directly threatens the safe operation of the photovoltaic system and the power grid.

[0003] At present, photovoltaic inverters cannot directly regulate output voltage, but indirectly affect voltage by adjusting power. Existing technologies usually use MPPT (Maximum power point tracking) algorithms to regulate photovoltaic output power. The MPPT algorithm monitors the nonlinear IV characteristics of the photovoltaic array in real time and dynamically adjusts the load impedance, combined with intelligent control algorithms (such as perturbation observation method, conductivity increment method or particle swarm optimization, etc.) to achieve efficient tracking of the maximum power point under dynamic changes in environmental parameters. However, the goal of the MPPT algorithm is to ensure the normal output of inverter power under abnormal conditions, and it lacks direct effect on voltage regulation. When the photovoltaic output power is normal, the photovoltaic output voltage may still exceed the limit or be undervoltage. The impact of excessive or low voltage on the system is more direct and serious, such as damage to electrical equipment, voltage collapse, and even large-scale power outages. The requirements of the power grid for voltage stability are significantly higher than those for power stability. Summary of the invention

[0004] The present invention provides a photovoltaic voltage control method and system based on adaptive dichotomy, an electronic device, and a computer-readable storage medium, which can respond quickly when the voltage fluctuates greatly, and can also make fine adjustments when approaching the target voltage, thereby minimizing the risk of voltage over-limit or under-voltage, improving the stability of the system, and realizing precise control of the photovoltaic output voltage.

[0005] According to one aspect of the present invention, a photovoltaic voltage control method based on an adaptive dichotomy method is provided, comprising the following contents: Collect the output voltage of the photovoltaic inverter and calculate the voltage error, where the voltage error refers to the difference between the target voltage and the current voltage; Determine the adaptive step adjustment coefficient of the binary method based on the voltage error, and calculate the power adjustment amount of the photovoltaic inverter; The output power of the photovoltaic inverter is adjusted based on the calculated power adjustment amount.

[0006] Furthermore, the adaptive step size adjustment coefficient of the dichotomy method is determined based on the following formula: ; in, k represents the adaptive step size adjustment coefficient, k max and k min Respectively represent the maximum step length adjustment coefficient and the minimum step length adjustment coefficient, ΔV ( t )express t The voltage error at the moment, ΔV 1 and ΔV 2 represents the preset voltage error threshold, and ΔV 1 > ΔV 2 , k 1 and k 2 is a constant.

[0007] Furthermore, the power regulation of the photovoltaic inverter is calculated based on the following formula: ; in, k represents the adaptive step size adjustment coefficient, ΔV ( t )express t The voltage error at the moment, ΔP current ( t )express t The power adjustment amount at the moment.

[0008] Further, after the voltage error is calculated, if the voltage error is within a preset safety range, voltage regulation is not performed, and if the voltage error is not within the preset safety range, voltage regulation is performed.

[0009] Furthermore, after the power regulation amount of the photovoltaic inverter is calculated, the following contents are also included: The output voltage of the photovoltaic inverter is sampled periodically and the oldest elimination mechanism is adopted to obtain a voltage sampling sequence. The correction coefficient is determined according to the latest voltage change and the latest voltage error in the voltage sampling sequence, and the power regulation amount of the photovoltaic inverter is corrected using the correction coefficient.

[0010] Further, when the latest voltage change is less than the first change threshold, if the latest voltage error is less than zero, the correction coefficient is set to w 21 , if the latest voltage error is greater than zero, the correction factor is set to w 22 , where 0< w 21 <1, w 22 >1, the first change threshold is less than zero; When the latest voltage change is greater than the second change threshold, if the latest voltage error is less than zero, the correction coefficient is set to w 11 , if the latest voltage error is greater than zero, the correction factor is set to w 12 ,in, w 11 >1,0< w 12 <1, the second change threshold is greater than zero; When the latest voltage variation is greater than or equal to the first variation threshold and less than or equal to the second variation threshold, the correction coefficient is set to 1 regardless of whether the latest voltage error is less than zero or greater than zero.

[0011] Furthermore, after the power regulation amount of the photovoltaic inverter is calculated, the following contents are also included: Dual feedback PID regulation is performed based on voltage feedback and power feedback, and the feedback regulation amount of the photovoltaic inverter is calculated.

[0012] In addition, the present invention also provides a photovoltaic voltage control system based on an adaptive dichotomy method, comprising: The voltage error calculation module is used to collect the output voltage of the photovoltaic inverter and calculate the voltage error, where the voltage error refers to the difference between the target voltage and the current voltage; A power regulation amount calculation module is used to determine an adaptive step adjustment coefficient of a binary method based on a voltage error, and calculate a power regulation amount of a photovoltaic inverter; The photovoltaic output power control module is used to adjust the output power of the photovoltaic inverter based on the calculated power adjustment amount.

[0013] In addition, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the above method by calling the computer program stored in the memory.

[0014] In addition, the present invention also provides a computer-readable storage medium for storing a computer program for photovoltaic voltage control based on the adaptive dichotomy method, wherein the computer program executes the steps of the method described above when running on a computer.

[0015] The present invention has the following beneficial effects: The photovoltaic voltage control method based on the adaptive binary method of the present invention determines the adaptive step adjustment coefficient of the binary method according to the voltage error, and calculates the power adjustment amount of the photovoltaic inverter, and makes the output voltage gradually approach the target voltage by dynamically adjusting the photovoltaic output power. Compared with the traditional binary method with a fixed step size, the adaptive binary method can flexibly change the step size according to the real-time voltage error, which can respond quickly when the voltage fluctuates greatly, and can make fine adjustments when approaching the target voltage, thereby minimizing the risk of voltage over-limit or under-voltage, improving the stability of the system, and realizing precise control of the photovoltaic output voltage.

[0016] In addition, the photovoltaic voltage control system based on the adaptive dichotomy method of the present invention also has the above advantages.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a flow chart of a photovoltaic voltage control method based on an adaptive dichotomy method according to a preferred embodiment of the present application; Figure 2 is another flow chart of a photovoltaic voltage control method based on an adaptive dichotomy method according to a preferred embodiment of the present application; Figure 3It is another flow chart of the photovoltaic voltage control method based on the adaptive dichotomy method according to the preferred embodiment of the present application; Figure 4 It is a schematic diagram of the module structure of a photovoltaic voltage control system based on an adaptive dichotomy method according to another embodiment of the present application. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] Reference Figure 1 The preferred embodiment of the present application provides a photovoltaic voltage control method based on an adaptive dichotomy method, comprising the following contents: Step S1: collecting the output voltage of the photovoltaic inverter and calculating the voltage error, wherein the voltage error refers to the difference between the target voltage and the current voltage; Step S2: determining an adaptive step adjustment coefficient of the binary method based on the voltage error, and calculating the power adjustment amount of the photovoltaic inverter; Step S3: adjusting the output power of the photovoltaic inverter based on the calculated power adjustment amount.

[0021] It can be understood that the photovoltaic voltage control method based on the adaptive binary division method of this embodiment determines the adaptive step adjustment coefficient of the binary division method according to the voltage error, and calculates the power adjustment amount of the photovoltaic inverter. By dynamically adjusting the photovoltaic output power, the output voltage gradually approaches the target voltage. Compared with the traditional binary division method with a fixed step size, the adaptive binary division method can flexibly change the step size according to the real-time voltage error. It can respond quickly when the voltage fluctuates greatly, and can make fine adjustments when approaching the target voltage, thereby minimizing the risk of voltage over-limit or under-voltage, improving the stability of the system, and realizing precise control of the photovoltaic output voltage.

[0022] In step S1, the output voltage of the photovoltaic inverter is monitored in real time by a voltage sensor, and a voltage error is calculated, wherein the voltage error refers to the difference between the target voltage and the current voltage, which can be expressed as: ΔV ( t )= V target - V ( t ),in, V target represents the target voltage, V ( t ) represents the output voltage of the photovoltaic inverter at time t, ΔV ( t ) represents the voltage error at time t.

[0023] In addition, in step S2, the power adjustment direction of the photovoltaic inverter can be determined according to the real-time voltage error calculated in step S1. For example, when the voltage error is a negative number, it means that the voltage may exceed the limit, and the output power of the photovoltaic inverter needs to be reduced. When the voltage error is a positive number, it means that the voltage may be under-voltage, and the output power of the photovoltaic inverter needs to be increased. In addition, the relationship between the output power and the output voltage of the photovoltaic inverter is: ,in, P ( t )express t The output power of the photovoltaic inverter at any moment, a , b , c is a constant, we can get: ,in, ΔP current ( t )express t The power regulation at the moment, ΔV ( t )express t The voltage error at the moment, ΔV ( t )= ΔV ( t ) / 2, that is, using the binary method to adjust, and simplifying again, we can get: ,in, k Represents the adaptive step length adjustment coefficient. ΔV ( t ) is used to design a piecewise function to achieve k The adaptive adjustment of the value is specifically based on the following formula to determine the adaptive step size adjustment coefficient of the dichotomy method: ; in, k represents the adaptive step size adjustment coefficient, k max and k min Respectively represent the maximum step length adjustment coefficient and the minimum step length adjustment coefficient, k max > k min , ΔV ( t )express t The voltage error at the moment, ΔV 1 and ΔV 2 represents the preset voltage error threshold, and ΔV 1 > ΔV 2, k 1 and k 2 is a constant, which is determined by the adjustment accuracy and tolerance range. When the voltage exceeds the limit or the voltage is undervoltage, the amplitude is small and needs to be adjusted slowly. k Use the minimum step adjustment coefficient to achieve fine adjustment; When the voltage exceeds the limit or is undervoltage, it indicates that the voltage is over-limit or undervoltage, and needs to be adjusted quickly. k The maximum step size adjustment coefficient is used to achieve fast response; When the voltage exceeds the limit or the voltage is undervoltage, the average difference adjustment method is used to construct a linear change process so that the larger the real-time voltage error is, the lower the voltage error is. k The larger the value, the smaller the real-time voltage error. k The smaller the value, the more stable the adjustment can be achieved. In addition, the above constant parameters and threshold parameters can be obtained through experiments or simulation optimization.

[0024] It can be understood that the present invention adaptively and dynamically adjusts the step adjustment coefficient of the binary method through the real-time voltage error, and realizes precise control of the voltage by continuously optimizing the power adjustment step. Compared with the traditional binary method with a fixed step size, the step size can be flexibly changed according to the real-time voltage error. It can respond quickly when the voltage fluctuates greatly, and can make fine adjustments when approaching the target voltage, thereby minimizing the risk of voltage over-limit or under-voltage and improving the stability of the system.

[0025] In addition, in step S3, the power regulation amount of the photovoltaic inverter is calculated in step S2. ΔP current ( t ), the target output power of the photovoltaic inverter at the next moment can be calculated as: P adjust ( t +1)= P current ( t )+ Δ P current ( t ),in, P current ( t )express t The output power of the photovoltaic inverter at any moment, P adjust ( t +1) t +1 is the target output power of the PV inverter at time.

[0026] In addition, the method of indirectly adjusting the output voltage by adjusting the output power of the photovoltaic inverter also has the defects of easy over-adjustment and delay. The reasons are as follows: 1) The output voltage of the photovoltaic inverter changes in real time, so the voltage error value also changes in real time. If the voltage error value is used to determine whether the voltage needs to be increased, if the voltage itself is also changing, it is easy to cause over-adjustment; 2) If the current voltage error is large, it is difficult for the adaptive binary adjustment to quickly adjust the output voltage to the target value, and the delay is relatively large; 3) When the voltage error is small, if it is still adjusted repeatedly, it will cause voltage over-adjustment, voltage instability, or cause a larger voltage error to cause over-adjustment. Although higher-order algorithms can be used to solve the defects of over-adjustment and delay, the calculation amount of high-order algorithms is large and it is difficult to meet the lightweight calculation requirements.

[0027] Therefore, optionally, the present invention calculates the voltage error ΔV ( t ) after, if the voltage error ΔV ( t ) in the preset safety zone α If the voltage error is within ΔV ( t ) is not within the preset safety range α The voltage regulation is only carried out internally, which can prevent the problem of voltage fluctuation being enhanced due to repeated regulation when the voltage error is small, and effectively solve the over-regulation problem. α The value of can be set according to actual needs, for example, it can be set to α = V target ×4.5%, that is, if the deviation between the current output voltage and the target voltage is within the safety range of 4.5%, no voltage regulation will be performed; voltage regulation will only be performed when the deviation exceeds the safety range of 4.5%.

[0028] It can be understood that after calculating the real-time voltage error, the present invention compares the voltage error with the preset safety interval. Voltage regulation is only performed when the voltage exceeds the preset safety interval, thereby preventing the problem of increased voltage fluctuations caused by repeated adjustments when the voltage error is small, and effectively solving the overregulation problem.

[0029] In addition, if Figure 2 As shown, the photovoltaic voltage control method based on the adaptive dichotomy method further includes the following contents after calculating the power regulation amount of the photovoltaic inverter: Step S21: Cyclic sampling of the output voltage of the photovoltaic inverter is performed and the oldest elimination mechanism is adopted to obtain a voltage sampling sequence, a correction coefficient is determined according to the latest voltage change and the latest voltage error in the voltage sampling sequence, and the power regulation amount of the photovoltaic inverter is corrected using the correction coefficient.

[0030] Specifically, the voltage sampling period is usually 20ms. In order to improve resource utilization, the present invention adopts a 100ms period to sample the output voltage value of the photovoltaic inverter to obtain the voltage sampling sequence V [ n ],in, n The maximum value is 1000, so one cycle lasts for 100 seconds, and the oldest elimination mechanism is adopted, that is, after storing 1000 data, the earliest data is eliminated and the latest data is added. Then, the latest voltage change Δ in the voltage sampling sequence is calculated V [ n -1], the calculation formula is: Δ V [ n -1]= V [ n ]- V [ n -1], and calculate the latest voltage error value Δ V ( n ), the calculation formula is: Δ V ( n )= V target - V [ n ], and according to Δ V [ n -1] and Δ V ( n ) determine the correction coefficient and use the correction coefficient to correct the power regulation amount of the photovoltaic inverter.

[0031] Among them, when the latest voltage change Δ V [ n -1] is less than the first change threshold β 1 When the latest voltage error Δ V ( n ) is less than zero, the correction factor w Set to w 21 , if the latest voltage error Δ V ( n ) is greater than zero, the correction factor w Set to w 22 , where 0< w 21 <1, w 22 >1, first change threshold β 1 Less than zero; when the latest voltage change Δ V [ n-1] is greater than the second change threshold β 2 When the latest voltage error Δ V ( n ) is less than zero, the correction factor w Set to w 11 , if the latest voltage error Δ V ( n ) is greater than zero, the correction factor w Set to w 12 ,in, w 11 >1,0< w 12 <1, the second change threshold β 2 Greater than zero; when the latest voltage change Δ V [ n -1] is greater than or equal to the first change threshold β 1 and is less than or equal to the second change threshold β 2 When the latest voltage error Δ V ( n ) is less than zero or greater than zero, the correction factor w Set to 1. Among them, β 1 , β 2 , w 21 , w 22 , w 11 , w 12 The value can be set according to actual needs. For example, in the power grid, the undervoltage judgment threshold is 78%× V target , the limit judgment threshold is 120%× V target , so for undervoltage and overlimit, the voltage tolerance is 22% and 20%, and the ratio is 11:10, then β 1 Possible values ​​are - V target ×0.66%, β 2 The possible values ​​are V target ×0.6%, w 11 The value is 3.6. w 12 The value is 0.8.w 21 The value is 0.88. w 22 The value is 3.27. In addition, the corrected power regulation amount is: .

[0032] It can be understood that the present invention determines the correction coefficient according to the latest voltage change and the latest voltage error. When the voltage change is a voltage increase trend, that is, ,like , that is, there is overvoltage. At this time, a larger correction coefficient is used to achieve fast reduction, so that the output voltage quickly approaches the target value. If , that is, there is undervoltage, at this time, a smaller correction coefficient is used to achieve slow increase and prevent over-adjustment; and when the voltage change is a voltage decrease trend, that is, ,like , that is, there is overpressure. At this time, a reduced correction coefficient is used to achieve slow reduction and prevent over-adjustment. , that is, there is undervoltage, at this time, a larger correction coefficient is used to achieve fast increase, so that the output voltage quickly approaches the target value; and when the voltage change is a stable trend, that is, ,regardless or , the correction coefficients are all 1, that is, no correction is performed. The present invention comprehensively corrects the power regulation amplitude of the photovoltaic inverter according to the real-time voltage change and voltage error, which can effectively solve the problems of overregulation and delay, and occupies less computing resources, which can well meet the lightweight computing requirements.

[0033] In addition, if Figure 3 As shown, the photovoltaic voltage control method based on the adaptive dichotomy method further includes the following contents after calculating the power regulation amount of the photovoltaic inverter: Step S22: performing dual feedback PID regulation based on voltage feedback and power feedback to calculate the feedback regulation amount of the photovoltaic inverter.

[0034] Specifically, the present invention also performs dual feedback PID regulation based on voltage feedback and power feedback to achieve power output optimization while ensuring voltage stability. Among them, PID regulation based on voltage feedback can be expressed as: ,in, k p , k i , k d represent the proportional coefficient, integral coefficient and differential coefficient respectively, ΔV ( t ) represents the voltage error, ΔV ( t) PID It represents the voltage error calculated based on PID feedback regulation. Since the inverter cannot directly regulate the output voltage, it is necessary to combine the formula: Convert it to: , Indicates the power regulation amount obtained by PID calculation based on voltage feedback.

[0035] In addition, PID adjustment based on power feedback can be expressed as: ,in, k p1 , k i1 , k d1 represent the proportional coefficient, integral coefficient and differential coefficient respectively, Indicates the power adjustment amount obtained by PID calculation based on power feedback.

[0036] Therefore, the feedback regulation of the photovoltaic inverter is: ,in, It represents the power feedback adjustment amount calculated based on the dual feedback PID adjustment. In addition, the target output power of the photovoltaic inverter at the next moment calculated at last is: P adjust ( t +1)= P current ( t )+ ΔP current ( t )+ ΔP PID ( t ).

[0037] It can be understood that the present invention performs dual feedback PID regulation based on voltage feedback and power feedback, adjusts the voltage error in real time based on voltage feedback to ensure voltage stability, and adjusts the output power in real time based on power feedback to achieve output optimization, which not only improves the power regulation accuracy and voltage control accuracy, but also enhances the robustness of the algorithm.

[0038] In addition, the inventors of the present invention have also conducted an experimental comparison between the photovoltaic voltage control method of the present invention and the existing MPPT algorithm. The experimental comparison results are shown in the following table:

[0039] It can be seen that the photovoltaic voltage control algorithm of the present invention has improvements in response speed, regulation accuracy and energy efficiency compared with the existing MPPT algorithm, and has improvements in response speed and regulation accuracy compared with the traditional fixed-step dichotomy method.

[0040] In addition, if Figure 4 As shown, another embodiment of the present invention further provides a photovoltaic voltage control system based on an adaptive dichotomy method, preferably using the photovoltaic voltage control method based on an adaptive dichotomy method as described above, including: The voltage error calculation module is used to collect the output voltage of the photovoltaic inverter and calculate the voltage error, where the voltage error refers to the difference between the target voltage and the current voltage; A power regulation amount calculation module is used to determine an adaptive step adjustment coefficient of a binary method based on a voltage error, and calculate a power regulation amount of a photovoltaic inverter; The photovoltaic output power control module is used to adjust the output power of the photovoltaic inverter based on the calculated power adjustment amount.

[0041] It can be understood that the photovoltaic voltage control system based on the adaptive dichotomy method of this embodiment determines the adaptive step adjustment coefficient of the dichotomy method according to the voltage error, and calculates the power adjustment amount of the photovoltaic inverter. By dynamically adjusting the photovoltaic output power, the output voltage gradually approaches the target voltage. Compared with the traditional fixed-step dichotomy method, the adaptive dichotomy method can flexibly change the step size according to the real-time voltage error. It can respond quickly when the voltage fluctuates greatly, and can make fine adjustments when approaching the target voltage, which minimizes the risk of voltage over-limit or under-voltage, improves the stability of the system, and realizes precise control of the photovoltaic output voltage.

[0042] In addition, the photovoltaic voltage control system based on the adaptive dichotomy method further includes: The power regulation correction module is used to perform cyclic sampling on the output voltage of the photovoltaic inverter and adopt the oldest elimination mechanism to obtain a voltage sampling sequence, determine the correction coefficient according to the latest voltage change and the latest voltage error in the voltage sampling sequence, and use the correction coefficient to correct the power regulation of the photovoltaic inverter.

[0043] In addition, the photovoltaic voltage control system based on the adaptive dichotomy method further includes: The dual feedback PID regulation module is used to perform dual feedback PID regulation based on voltage feedback and power feedback, and calculate the feedback regulation amount of the photovoltaic inverter.

[0044] In addition, another embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the above method by calling the computer program stored in the memory.

[0045] In addition, another embodiment of the present invention further provides a computer-readable storage medium for storing a computer program for photovoltaic voltage control based on an adaptive dichotomy method, wherein the computer program executes the steps of the method described above when running on a computer.

[0046] Common computer-readable storage media include: floppy disks, flexible disks, hard disks, magnetic tapes, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tapes, any other physical media with patterns of holes, random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), flash-erasable programmable read-only memory (FLASH-EPROM), any other memory chip or cartridge, or any other medium that can be read by a computer. Instructions can further be transmitted or received by a transmission medium. The term transmission medium may include any tangible or intangible medium that can be used to store, encode or carry instructions for execution by a machine, and includes digital or analog communication signals or intangible media that facilitate communication of the above instructions. Transmission media include coaxial cables, copper wire, and optical fiber, including the wires of a bus used to transmit a computer data signal.

[0047] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0048] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0049] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0050] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0051] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic voltage control method based on adaptive dichotomy, characterized in that: Includes the following: Collect the output voltage of the photovoltaic inverter and calculate the voltage error, where the voltage error refers to the difference between the target voltage and the current voltage; Determine the adaptive step adjustment coefficient of the binary method based on the voltage error, and calculate the power adjustment amount of the photovoltaic inverter; The output power of the photovoltaic inverter is adjusted based on the calculated power adjustment amount.

2. The photovoltaic voltage control method based on the adaptive dichotomy method according to claim 1, characterized in that: The adaptive step size adjustment coefficient of the dichotomy method is determined based on the following formula: in, k represents the adaptive step size adjustment coefficient, k max and k min Respectively represent the maximum step length adjustment coefficient and the minimum step length adjustment coefficient, ΔV ( t )express t The voltage error at the moment, ΔV 1 and ΔV 2 represents the preset voltage error threshold, and ΔV 1> Δ V 2, k 1 and k 2 is a constant.

3. The photovoltaic voltage control method based on the adaptive dichotomy method according to claim 1, characterized in that: The power regulation of the photovoltaic inverter is calculated based on the following formula: in, k represents the adaptive step size adjustment coefficient, ΔV ( t )express t The voltage error at the moment, ΔP current ( t )express t The power adjustment amount at the moment.

4. The photovoltaic voltage control method based on the adaptive dichotomy method according to claim 1, characterized in that: After the voltage error is calculated, if the voltage error is within the preset safety range, voltage regulation is not performed; if the voltage error is not within the preset safety range, voltage regulation is performed.

5. The photovoltaic voltage control method based on the adaptive dichotomy method according to claim 4, characterized in that: After calculating the power regulation of the photovoltaic inverter, the following contents are also included: The output voltage of the photovoltaic inverter is sampled periodically and the oldest elimination mechanism is adopted to obtain a voltage sampling sequence. The correction coefficient is determined according to the latest voltage change and the latest voltage error in the voltage sampling sequence, and the power regulation amount of the photovoltaic inverter is corrected using the correction coefficient.

6. The photovoltaic voltage control method based on the adaptive dichotomy method according to claim 5, characterized in that: When the latest voltage change is less than the first change threshold, if the latest voltage error is less than zero, the correction coefficient is set to w 21 , if the latest voltage error is greater than zero, the correction factor is set to w 22 , where 0< w 21 <1, w 22 >1, the first change threshold is less than zero; When the latest voltage change is greater than the second change threshold, if the latest voltage error is less than zero, the correction coefficient is set to w 11 , if the latest voltage error is greater than zero, the correction factor is set to w 12 ,in, w 11 >1,0< w 12 <1, the second change threshold is greater than zero; When the latest voltage variation is greater than or equal to the first variation threshold and less than or equal to the second variation threshold, the correction coefficient is set to 1 regardless of whether the latest voltage error is less than zero or greater than zero.

7. The photovoltaic voltage control method based on the adaptive dichotomy method according to claim 1, characterized in that: After calculating the power regulation of the photovoltaic inverter, the following contents are also included: Based on voltage feedback and power feedback, dual feedback PID regulation is performed to calculate the feedback regulation value of the photovoltaic inverter.

8. A photovoltaic voltage control system based on adaptive dichotomy, characterized in that: include: The voltage error calculation module is used to collect the output voltage of the photovoltaic inverter and calculate the voltage error, where the voltage error refers to the difference between the target voltage and the current voltage; A power regulation amount calculation module is used to determine an adaptive step adjustment coefficient of a binary method based on a voltage error, and calculate a power regulation amount of a photovoltaic inverter; The photovoltaic output power control module is used to adjust the output power of the photovoltaic inverter based on the calculated power adjustment amount.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor is used to execute the steps of the method according to any one of claims 1 to 7 by calling the computer program stored in the memory.

10. A computer-readable storage medium for storing a computer program for photovoltaic voltage control based on an adaptive dichotomy method, characterized in that: When the computer program is run on a computer, the steps of the method according to any one of claims 1 to 7 are executed.

Images