Regulation and control method and system of photovoltaic inverter

Abstract

The invention belongs to the technical field of photovoltaic power generation, and provides a photovoltaic inverter regulation and control method and system, and the method comprises the steps: obtaining the real-time power generation power and target networking power of photovoltaic power generation; adjusting the duty ratio of an IGBT (Insulated Gate Bipolar Translator) of the photovoltaic inverter based on the obtained real-time power generation power; based on the IGBT duty ratio, the generated power of photovoltaic power generation is adjusted, and the maximum generated power of photovoltaic power generation is obtained; and adjusting energy storage and energy release of the photovoltaic inverter according to the target on-grid power and the maximum power generation power to complete regulation and control of the photovoltaic inverter.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic power generation technology, specifically relating to a control method and system for a photovoltaic inverter. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the advancement of energy transition, new energy power generation technologies, represented by wind power and photovoltaics, have developed rapidly. To adapt to the large-scale and high-proportion integration of new energy, a new type of power system based on new energy has gradually emerged. In the process of promoting the full participation of new energy power generation in power market regulation, the grid-connected electricity of new energy power generation should, in principle, all enter the market for trading. That is, new energy power generation is gradually shifting from the traditional "guaranteed quantity and price" or "guaranteed quantity and bidding" model to the "quotation of quantity and price" model.

[0004] Electricity spot markets typically operate on a 15-minute trading session, requiring participating power plants to be able to accurately predict power generation for the next trading session or adjust their actual grid connection power in real time according to the trading contract.

[0005] Photovoltaic power generation is heavily dependent on meteorological factors such as solar irradiance, ambient temperature, and cloud cover, which introduces inherent intermittency and randomness to photovoltaic power generation, posing a significant challenge to photovoltaic power prediction.

[0006] Photovoltaic inverters convert direct current (DC) generated by photovoltaic (PV) power into alternating current (AC) that meets grid requirements, enabling maximum power point tracking (MPPT) of PV panels to maximize energy extraction from solar energy. However, current PV inverters typically lack the ability to directly link with grid dispatch commands for precise power control and lack built-in energy storage buffer units to mitigate power fluctuations. A combination of PV and energy storage can be used, but this is generally a simple combination of a PV inverter, a separate power storage converter (PCS), and a battery system. The control strategies are mostly reactive, and the response speed and overall coordination need improvement.

[0007] Therefore, there is an urgent need for a control method and system that can deeply integrate photovoltaic power generation, energy storage buffering and smart grid interaction functions into a single device, so as to fundamentally solve the problems of prediction and control difficulties faced by photovoltaic power generation in a market-based trading environment. Summary of the Invention

[0008] To address the aforementioned issues, this invention proposes a control method and system for photovoltaic inverters. It employs a photovoltaic inverter that integrates energy storage and release, highly integrating functions such as MPPT control, inverter grid connection, and energy storage and release management. Through intelligent monitoring and control, it effectively protects the energy storage battery, responds in real time to grid dispatch instructions or electricity market transaction results, and achieves precise control of photovoltaic grid-connected power.

[0009] According to some embodiments, the first aspect of the present invention provides a method for controlling a photovoltaic inverter, which adopts the following technical solution: A method for controlling a photovoltaic inverter, comprising: Obtain the real-time power generation and target grid connection power of photovoltaic power generation; Based on the acquired real-time power generation, the duty cycle of the IGBTs in the photovoltaic inverter is adjusted. By adjusting the IGBT duty cycle, the power output of photovoltaic power generation can be obtained to achieve the maximum power output of photovoltaic power generation. The photovoltaic inverter's energy storage and release are adjusted according to the target grid-connected power and maximum power generation to complete the regulation of the photovoltaic inverter.

[0010] As a further technical limitation, in the process of adjusting the energy storage and release of the photovoltaic inverter according to the target grid-connected power and the maximum power generation, when the target grid-connected power is lower than the maximum power generation, the photovoltaic inverter is controlled to discharge and release energy; when the target grid-connected power is higher than the maximum power generation, the photovoltaic inverter is controlled to charge and store energy.

[0011] As a further technical limitation, a photovoltaic inverter control method also includes real-time monitoring of the battery bus voltage; when the monitored battery bus voltage reaches or approaches the full charge voltage, the amount of electricity to be fed into the grid in the next time period is increased; if the battery bus voltage reaches the full charge voltage before the application is approved, the energy storage operation is forcibly stopped and the photovoltaic inverter is controlled to reduce the photovoltaic output power; when the battery bus voltage reaches or approaches the full discharge voltage, the amount of electricity to be fed into the grid in the next time period is reduced; if the battery bus voltage reaches the full discharge voltage before the application is approved, the energy release operation is forcibly stopped, so that the photovoltaic inverter feeds into the grid only with the actual photovoltaic power generated.

[0012] Furthermore, the near-full charge voltage is when the battery bus voltage is at... Within the voltage range, where, This is a negative voltage margin set according to the characteristics of the battery. The full charge voltage is the voltage at which the battery bus voltage is approximately equal to the full discharge voltage. Within the voltage range, where, This is a positive voltage margin set according to the characteristics of the battery. This is the full discharge voltage.

[0013] As a further technical limitation, the target grid-connected power is the AGC command received from the grid dispatch master station via the power dispatch data network or the power setting value based on the clearing results of the electricity spot market.

[0014] As a further technical limitation, a photovoltaic inverter integrating energy storage and release is adopted. The photovoltaic inverter includes at least a voltage regulation module, an inverter bus, an inverter module, a energy storage and release module, a battery bus, a battery module, and a battery bus voltmeter. The input terminal of the voltage regulation module is connected to the photovoltaic matrix, and the output terminal is connected to the inverter bus. The inverter module is connected to the inverter bus and is used to convert DC power into AC power and connect it to the power grid. The energy storage and release module is connected between the inverter bus and the battery bus and is used to control the bidirectional flow of energy between the inverter bus and the battery module. The battery module is connected to the battery bus. The battery bus voltmeter is used to monitor the voltage of the battery bus.

[0015] According to some embodiments, the second aspect of the present invention provides a control system for a photovoltaic inverter, which adopts the following technical solution: A control system for a photovoltaic inverter, comprising: The acquisition module is configured to acquire the real-time power generation and target grid-connected power of photovoltaic power generation; The adjustment module is configured to adjust the IGBT duty cycle of the photovoltaic inverter based on the acquired real-time power generation; and adjust the power generation of the photovoltaic power generation based on the IGBT duty cycle to obtain the maximum power generation of the photovoltaic power generation. The control module is configured to adjust the energy storage and release of the photovoltaic inverter according to the target grid-connected power and the maximum power generation, thereby completing the control of the photovoltaic inverter.

[0016] According to some embodiments, a third aspect of the present invention provides a computer-readable storage medium, employing the following technical solution: A computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps in the control method for a photovoltaic inverter as described in the first aspect of the present invention.

[0017] According to some embodiments, the fourth aspect of the present invention provides an electronic device, which adopts the following technical solution: An electronic device includes a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor executes the program to implement the steps in the control method for a photovoltaic inverter as described in the first aspect of the present invention.

[0018] According to some embodiments, the fifth aspect of the present invention provides a computer program product, which adopts the following technical solution: A computer program product includes software code, wherein the program in the software code performs the steps in the control method for a photovoltaic inverter as described in the first aspect of the present invention.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention directly embeds energy storage functionality and its control system within the photovoltaic inverter, forming a unified "photovoltaic-storage integrated machine." This eliminates the need for a separate energy storage converter (PCS), some switching equipment, and complex system integration work, significantly reducing system equipment costs, installation costs, and space occupancy. By using a storage-release module as a flexible power buffer, it successfully transforms randomly fluctuating photovoltaic power into a "quasi-controllable power source" capable of outputting power strictly according to grid dispatch instructions or market contracts, greatly enhancing the photovoltaic power station's ability and competitiveness in the electricity market. The photovoltaic matrix always operates in MPPT mode, maximizing solar energy capture. Surplus energy is stored and released when electricity prices are high or demand is high, achieving spatiotemporal energy transfer and improving the overall economic benefits of the power station. Precise power control avoids performance penalties due to power deviations. Through a three-level protection mechanism of "prediction-reporting-intervention," the system's operating strategy is dynamically adjusted, fundamentally preventing overcharging and over-discharging of the batteries, effectively extending battery life, and reducing the system's total life-cycle cost.

[0020] This invention enables numerous distributed photovoltaic (PV) power plants to become adjustable resources for the power grid, rather than a burden. They can respond to dispatch commands like traditional power plants, participate in ancillary services such as peak shaving and frequency regulation, contribute to maintaining the stable operation of the power grid, and aid in the construction of a new type of power system. Attached Figure Description

[0021] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0022] Figure 1 This is a flowchart of the control method for a photovoltaic inverter in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the photovoltaic inverter in Embodiment 1 of the present invention; Figure 3 This is a structural block diagram of the control system of the photovoltaic inverter in Embodiment 2 of the present invention; The components include: 1. Voltage regulating module; 101. MPPT controller; 2. Inverter bus; 3. Inverter module; 301. Inverter controller; 4. Energy storage module; 401. Energy storage regulating IGBT; 402. Energy release regulating IGBT; 5. Battery bus; 6. Battery module; 7. Inverter bus voltmeter; and 8. AC power grid. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any component or element in this invention. They should not be construed as limiting the invention.

[0027] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0028] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0029] Example 1 Embodiment 1 of this invention introduces a method for controlling a photovoltaic inverter.

[0030] like Figure 1 The method for controlling a photovoltaic inverter, as shown, includes: Obtain the real-time power generation and target grid connection power of photovoltaic power generation; Based on the acquired real-time power generation, the duty cycle of the IGBTs in the photovoltaic inverter is adjusted. By adjusting the IGBT duty cycle, the power output of photovoltaic power generation can be obtained to achieve the maximum power output of photovoltaic power generation. The photovoltaic inverter's energy storage and release are adjusted according to the target grid-connected power and maximum power generation to complete the regulation of the photovoltaic inverter.

[0031] In the process of regulating the photovoltaic inverter, this embodiment adopts the following... Figure 2 The photovoltaic inverter shown integrates energy storage and release, including a voltage regulation module 1, an inverter bus 2, an inverter module 3, an energy storage and release module 4, a battery bus 5, a battery module 6, and a battery bus voltmeter 7. Specifically, the DC power output from the photovoltaic matrix is ​​connected to the input terminal of the voltage regulation module 1. The output terminal of the voltage regulation module 1 is connected to the inverter bus 2, which is a key DC power hub, branching into two main branches: the first branch connects downwards to the DC input terminal of the inverter module 3; the second branch connects to one end of the energy storage and release module 4; the other end of the energy storage and release module 4 is connected to the battery module 6 via the battery bus 5; the AC output terminal of the inverter module 3 is finally connected to the AC power grid 8; the battery bus voltmeter 7 is directly connected in parallel to the battery bus 5, used for real-time sampling of voltage signals and feedback to the inverter controller 301.

[0032] In this embodiment, the voltage regulation module 1 includes an MPPT controller 101 for realizing maximum power point tracking of the photovoltaic matrix; the inverter module 3 includes an inverter controller 301 for controlling the inverter process and communicating with the grid dispatch system and coordinating the control of other modules; the energy storage and release module 4 includes an energy storage regulating IGBT 401 and an energy release regulating IGBT 402 for controlling the charging and discharging circuits, respectively.

[0033] It should be noted that the maximum operating voltage of the energy storage and release module 4, i.e. the full-charge voltage of the battery module 6, is lower than the rated operating voltage of the inverter bus 2. This ensures that when energy needs to be released, the energy storage and release module 4 can boost the battery voltage to the inverter bus voltage level through a voltage boosting operation, thereby realizing the smooth feeding of energy to the grid.

[0034] As one or more embodiments, in this embodiment, the inverter controller obtains the target grid-connected power Q1 for the current period from the power grid dispatching system; the inverter controller obtains the actual power generation Q2 of the photovoltaic matrix through the MPPT controller; compares Q1 with Q2. When Q1 < Q2, there is excess power generation, then the inverter controller activates the energy storage function of the energy storage and release module, closes the energy storage regulation IGBT, and controls the charging power by precisely adjusting its duty cycle, so that the power Q3 flowing from the photovoltaic matrix to the battery is Q3 = Q2 - Q1, ensuring that the actual power fed into the grid is exactly equal to Q1; when Q1 > Q2, there is insufficient power generation, then the inverter controller activates the energy release function of the energy storage and release module, closes the energy release regulation IGBT, and controls the discharge power by precisely adjusting its duty cycle, so that the power Q4 supplemented from the battery to the inverter bus is Q4 = Q1 - Q2. Thus, ensuring that the actual power fed into the grid is exactly equal to Q1; when Q1 = Q2, the energy storage and release module does not work, and all photovoltaic power generation is directly fed into the grid.

[0035] In this embodiment, the inverter controller continuously monitors the battery bus voltage V3 and compares it with the preset battery safety voltage thresholds (fully charged voltage and fully discharged voltage ), and accordingly dynamically adjusts the power declaration strategy for the next trading period and intervenes in real-time control to protect the battery; specifically: (1) Determine whether V3 is close to or reaches ; if so, it means that the battery power is high and close to the fully charged state. When the inverter controller declares the grid-connected power for the next period, it will actively increase the declared amount (for example, declare a predicted value ≥ Q2), intending to discharge more in the next period to consume the battery stock and avoid overcharging.

[0036] It should be noted that being close to the fully charged voltage means that the battery bus voltage is within the voltage range of , where is the negative voltage margin set according to the battery characteristics, and is the fully charged voltage.

[0037] It should be noted that if the battery voltage reaches before the new, higher declared amount is approved by the power grid, or the power grid cannot meet the increased declared capacity, the energy storage regulation IGBT will be forced to close and charging will stop; at the same time, the inverter controller will instruct the MPPT controller to disengage from the maximum power point tracking mode and instead execute power reduction operation, reducing the photovoltaic power generation Q2 to be equal to the grid demand Q1, that is, performing "light curtailment" processing to fundamentally eliminate the overcharging risk.

[0038] (2) Determine whether V3 is close to or reaches If so, it indicates that the battery power is low and approaching the discharged state. When the inverter controller declares the grid-connected power for the next period, it will actively reduce the declared amount (for example, declare a predicted value ≤ Q2), intending to reduce the discharge demand in the next period and reserve space for charging the battery to avoid over-discharge.

[0039] It should be noted that the near-full discharge voltage is when the battery bus voltage is within the voltage range, where is the positive voltage margin set according to the battery characteristics, and is the full discharge voltage.

[0040] It should be noted that if the battery voltage has dropped to before the new and lower declared amount is approved, the energy release regulating IGBT will be forced to close and the discharge will stop. At this time, the system temporarily exits the grid frequency modulation function, and the inverter only sends the actual photovoltaic power Q2 to the grid until there is again surplus photovoltaic power (Q1 < Q2) and charging of the battery starts.

[0041] Case analysis In this embodiment, the parameters of the photovoltaic inverter are set as follows: the rated capacity of the photovoltaic matrix is 200 kW, the open-circuit voltage of the photovoltaic matrix is 800 V, the capacity of the battery module is 60 kWh, the full charge voltage of the battery ( is 756 V, the full discharge voltage of the battery ( is 540 V, and the rated voltage of the inverter bus is 800 V.

[0042] In the current period, the MPPT controller monitors the power generation of the photovoltaic matrix as 170 kW, the inverter bus voltage as 800 V, the stored power of the battery as 20 kWh, and the battery bus voltage as 650 V; the inverter controller obtains the grid dispatching frequency modulation signal for this period, requiring a grid-connected power of 150 kW, which is less than the power generation of the photovoltaic matrix (170 kW). The inverter controller 301 activates the storage and release module 4, the energy storage regulating IGBT 401 closes, and the inverter controller 301 controls the duty cycle of the energy release regulating IGBT 402 to adjust the power transmitted from the photovoltaic matrix bus to the battery bus, so that Q3 = Q2 - Q1 = 170 kW - 150 kW = 20 kW.

[0043] At the current time, the MPPT controller monitors the photovoltaic matrix power generation as 140kW, the inverter bus voltage as 800V, the battery storage capacity as 30kWh, and the battery bus voltage as 670V. The inverter controller receives the grid dispatch frequency regulation signal for this time period, requiring the grid-connected power to be 150kW, which is greater than the photovoltaic matrix power generation (140kW). At this time, the inverter controller 301 shuts down the energy storage and release module 4, the energy release voltage regulating IGBT 402 closes, and the duty cycle of the energy storage regulating IGBT 401 is adjusted so that the output voltage of the energy release module is ≥800V. The power transmitted from the battery bus to the inverter bus is adjusted so that Q4=Q1-Q2=150kW-140kW=10kW.

[0044] At the current time, the MPPT controller monitors the photovoltaic matrix power generation at 140kW, the inverter bus voltage at 800V, the battery capacity at 59kWh, and the battery bus voltage at 754V. The inverter controller receives the grid dispatch frequency regulation signal for this time period, requiring a grid-connected power generation of 130kW, which is less than the photovoltaic matrix power generation (140kW). Since the battery bus voltage is 754V, close to the full-charge voltage of the battery pack (756V), the inverter controller 301 issues a capacity application for the next time period ≥140kW. Before the new grid-connected capacity is approved, or if the newly approved grid-connected capacity is still less than 140kW, the storage and release module 4 is shut down after the battery bus voltage reaches 756V. At this time, the MPPT controller 101 adjusts and controls according to 130kW, relinquishing some of the photovoltaic cell power generation capacity.

[0045] At the current time, the MPPT controller monitors the photovoltaic matrix power generation at 140kW, the inverter bus voltage at 800V, the battery capacity at 2kWh, and the battery bus voltage at 545V. The inverter controller receives the grid dispatch frequency regulation signal for this time period, requiring a grid-connected power generation of 150kW, which is greater than the photovoltaic matrix power generation (140kW). At this time, the inverter controller 301 issues a capacity application for the next time period ≤140kW. Before the new grid-connected capacity is approved, the storage and release module 4 is shut down after the battery bus voltage reaches 540V. At this time, the inverter controller 301 adjusts and controls the power generation according to 140kW.

[0046] This embodiment directly embeds the energy storage function and its control system into the photovoltaic inverter, forming a unified "photovoltaic-storage integrated machine." This eliminates the need for a separate energy storage converter (PCS), some switching equipment, and complex system integration work, significantly reducing system equipment costs, installation costs, and space occupation. By using the storage-release module as a flexible power buffer, it successfully transforms randomly fluctuating photovoltaic power into a "quasi-controllable power source" capable of outputting power strictly according to grid dispatch instructions or market contracts, greatly enhancing the photovoltaic power station's ability and competitiveness in the electricity market. The photovoltaic matrix always operates in MPPT mode, maximizing solar energy capture. Surplus electricity is stored and released when electricity prices are high or demand is high, achieving spatiotemporal energy transfer and improving the overall economic benefits of the power station. Precise power control avoids performance penalties due to power deviations. Through a three-level protection mechanism of "prediction-reporting-intervention," the system's operating strategy is dynamically adjusted, fundamentally preventing overcharging and over-discharging of the batteries, effectively extending battery life, and reducing the system's total life cycle cost.

[0047] This embodiment enables a large number of distributed photovoltaic power plants to become adjustable resources for the power grid, rather than a burden. They can respond to dispatch commands like traditional power plants, participate in ancillary services such as peak shaving and frequency regulation, contribute to maintaining the stable operation of the power grid, and help build a new type of power system.

[0048] Example 2 Embodiment 2 of the present invention introduces a control system for a photovoltaic inverter.

[0049] like Figure 3 The control system for a photovoltaic inverter shown includes: The acquisition module is configured to acquire the real-time power generation and target grid-connected power of photovoltaic power generation; The adjustment module is configured to adjust the IGBT duty cycle of the photovoltaic inverter based on the acquired real-time power generation; and adjust the power generation of the photovoltaic power generation based on the IGBT duty cycle to obtain the maximum power generation of the photovoltaic power generation. The control module is configured to adjust the energy storage and release of the photovoltaic inverter according to the target grid-connected power and the maximum power generation, thereby completing the control of the photovoltaic inverter.

[0050] The detailed steps are the same as the control method for the photovoltaic inverter provided in Example 1, and will not be repeated here.

[0051] Example 3 Embodiment 3 of the present invention provides a computer-readable storage medium.

[0052] A computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps in the control method for a photovoltaic inverter as described in Embodiment 1 of the present invention.

[0053] The detailed steps are the same as the control method for the photovoltaic inverter provided in Example 1, and will not be repeated here.

[0054] Example 4 Embodiment 4 of the present invention provides an electronic device.

[0055] An electronic device includes a memory, a processor, and a program stored in the memory and running on the processor. When the processor executes the program, it implements the steps in the control method of a photovoltaic inverter as described in Embodiment 1 of the present invention.

[0056] The detailed steps are the same as the control method for the photovoltaic inverter provided in Example 1, and will not be repeated here.

[0057] Example 5 Embodiment 5 of the present invention provides a computer program product.

[0058] A computer program product includes software code, wherein the program in the software code performs the steps of the control method for a photovoltaic inverter as described in Embodiment 1 of the present invention.

[0059] The detailed steps are the same as the control method for the photovoltaic inverter provided in Example 1, and will not be repeated here.

[0060] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take 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 code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0061] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0062] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0063] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0064] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0065] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0066] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A method for controlling a photovoltaic inverter, characterized in that, include: Obtain the real-time power generation and target grid connection power of photovoltaic power generation; Based on the acquired real-time power generation, the duty cycle of the IGBTs in the photovoltaic inverter is adjusted. By adjusting the IGBT duty cycle, the power output of photovoltaic power generation can be obtained to achieve the maximum power output of photovoltaic power generation. The photovoltaic inverter's energy storage and release are adjusted according to the target grid-connected power and maximum power generation to complete the regulation of the photovoltaic inverter.

2. The method for controlling a photovoltaic inverter as described in claim 1, characterized in that, In the process of adjusting the energy storage and release of the photovoltaic inverter according to the target grid power and the maximum power generation, when the target grid power is lower than the maximum power generation, the photovoltaic inverter is controlled to discharge and release energy; when the target grid power is higher than the maximum power generation, the photovoltaic inverter is controlled to charge and store energy.

3. The method for controlling a photovoltaic inverter as described in claim 1, characterized in that, It also includes real-time monitoring of the battery bus voltage; when the monitored battery bus voltage reaches or approaches full charge voltage, the amount of electricity to be reported to the grid in the next time period is increased; if the battery bus voltage reaches full charge voltage before the report is approved, the energy storage operation is forcibly stopped and the photovoltaic inverter is controlled to reduce the photovoltaic output power; when the battery bus voltage reaches or approaches full discharge voltage, the amount of electricity to be reported to the grid in the next time period is reduced; if the battery bus voltage reaches full discharge voltage before the report is approved, the energy release operation is forcibly stopped, so that the photovoltaic inverter only feeds into the grid with the actual photovoltaic power generated.

4. The method for controlling a photovoltaic inverter as described in claim 3, characterized in that, The near-full charge voltage is when the battery bus voltage is at... Within the voltage range, where, This is a negative voltage margin set according to the characteristics of the battery. The full charge voltage is the voltage at which the battery bus voltage is approximately equal to the full discharge voltage. Within the voltage range, where, This is a positive voltage margin set according to the characteristics of the battery. This is the full discharge voltage.

5. The method for controlling a photovoltaic inverter as described in claim 1, characterized in that, The target on-grid power is the AGC command received from the power grid dispatch master station via the power dispatch data network or the power setting value based on the power spot market clearing results.

6. The method for controlling a photovoltaic inverter as described in claim 1, characterized in that, A photovoltaic inverter integrating energy storage and release is adopted. The photovoltaic inverter includes at least a voltage regulation module, an inverter bus, an inverter module, a energy storage and release module, a battery bus, a battery module, and a battery bus voltmeter. The input terminal of the voltage regulation module is connected to the photovoltaic matrix, and the output terminal is connected to the inverter bus. The inverter module is connected to the inverter bus and is used to invert DC power into AC power and connect it to the power grid. The energy storage and release module is connected between the inverter bus and the battery bus and is used to control the bidirectional flow of energy between the inverter bus and the battery module. The battery module is connected to the battery bus. The battery bus voltmeter is used to monitor the voltage of the battery bus.

7. A control system for a photovoltaic inverter, characterized in that, include: The acquisition module is configured to acquire the real-time power generation and target grid-connected power of photovoltaic power generation; The adjustment module is configured to adjust the IGBT duty cycle of the photovoltaic inverter based on the acquired real-time power generation. By adjusting the IGBT duty cycle, the power output of photovoltaic power generation can be obtained to achieve the maximum power output of photovoltaic power generation. The control module is configured to adjust the energy storage and release of the photovoltaic inverter according to the target grid-connected power and the maximum power generation, thereby completing the control of the photovoltaic inverter.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the control method for a photovoltaic inverter as described in any one of claims 1-6.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the program, it implements the steps of the control method for a photovoltaic inverter as described in any one of claims 1-6.

10. A computer program product, comprising software code, characterized in that, The program in the software code executes the steps of the control method for the photovoltaic inverter as described in any one of claims 1-6.

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