Network construction type control method for optical storage hybrid system and related equipment

Abstract

The invention relates to the technical field of photovoltaic energy storage cooperative control, in particular to a network construction type control method and related equipment for an optical storage hybrid system, and the method comprises the steps: obtaining photovoltaic and energy storage operation data and a battery SOC state in real time, and combining the target power of a power grid side, and carrying out the self-adaptive switching between two modes; entering a frequency support mode, adopting a droop control strategy, leading an energy storage battery, and actively adjusting AC voltage and frequency to enhance the stability of a power grid; and when the SOC is relatively low, switching to a constant power mode is carried out, a novel matching control strategy is adopted for control, a photovoltaic unit is dominated, the alternating-current voltage is accurately adjusted, and meanwhile, the direct-current voltage is stabilized so as to meet the requirements of a power grid. The problem that the units are poor in collaboration is solved, and the response speed of the system and the adaptability and stability of grid-connected operation are remarkably improved through dual-mode intelligent control.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic energy storage collaborative control technology, specifically to a grid-type control method and related equipment for a photovoltaic-energy storage hybrid system. Background Technology

[0002] With the accelerated global transition to low-carbon energy, the penetration rate of renewable energy sources such as solar power in power systems has significantly increased. Traditional power systems rely on synchronous generators for inertia support and frequency regulation, while photovoltaic energy is typically connected to the grid via grid-connected inverters. These inverters depend on the grid voltage phase for synchronization and cannot independently construct grid voltage, which will bring two types of problems to the power system: inertia loss problem, as synchronous generators are gradually decommissioned, system inertia decreases and frequency fluctuations intensify; and weak disturbance immunity, as grid-connected inverters are prone to oscillation and instability under weak grid conditions.

[0003] To improve stability, grid-based control has become a research hotspot. Existing grid-based control technologies include: droop control, which adjusts voltage and frequency by simulating the power frequency characteristics of synchronous generators, but relies on energy storage devices to maintain DC bus voltage stability; and novel matching (voltage building-frequency following) control, which enables autonomous adjustment of AC side voltage building and DC bus voltage, suitable for photovoltaic-dominated scenarios, but lacks active frequency support capabilities. Currently, power systems mostly adopt a single grid-based mode: either energy storage devices are the main force, using energy storage to support the DC bus, with droop control as the synchronous control strategy; or photovoltaic energy is the main force, maintaining DC voltage through voltage building-frequency following control. However, photovoltaic output is intermittent, and energy storage capacity is limited by state of charge (SOC), making it difficult for a single mode to simultaneously ensure stable operation under all operating conditions and grid support functions.

[0004] Existing new energy control models suffer from rigidity: grid-based systems operate in a fixed single mode, unable to dynamically switch based on the energy storage's SOC (state of charge) and grid support requirements. When the energy storage system's charge is insufficient (SOC < 60%), forcing the use of frequency support mode may lead to system collapse due to DC bus instability; conversely, if photovoltaic energy is always the dominant source, and a voltage-frequency-following synchronous control strategy is still used when energy storage is sufficient, the necessary frequency regulation function cannot be provided.

[0005] Meanwhile, operating in a single mode can lead to insufficient resource utilization. When energy storage capacity is sufficient, the utilization rate of photovoltaic energy needs to be maximized; when photovoltaic energy is the dominant energy source, energy storage cannot realize its frequency support potential. In summary, there is an urgent need for a hybrid system control method that can dynamically coordinate photovoltaic and energy storage, autonomously switch grid configuration modes to meet power system stability requirements, and ensure a smooth switching process. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a grid-type control method and related equipment for photovoltaic-storage hybrid systems, which addresses the shortcomings of the prior art and solves the technical problems of poor system stability and slow response speed caused by the lack of coordinated allocation of components in photovoltaic-hybrid energy storage systems.

[0007] The objective of this invention is achieved through the following technical solutions: In a first aspect, the present invention provides a method for network configuration control in a photovoltaic-storage hybrid system, comprising: Acquire operational data of photovoltaic power generation units and energy storage batteries in a photovoltaic-storage hybrid system, determine the grid-side target power based on the operational data, and collect the SOC status of the energy storage batteries; Based on the current SOC state of the energy storage battery and the target power on the grid side, the corresponding control mode is determined to control the photovoltaic-storage hybrid system. The control modes include constant power mode and frequency support mode; The constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, adjusting the AC and DC voltages to meet the grid-side target power. The frequency support mode employs a droop control strategy to control the energy storage battery, adjusting the AC side voltage and frequency to meet the grid-side target power.

[0008] As a further improvement of the present invention, acquiring operational data of the photovoltaic power generation unit and the energy storage battery in the photovoltaic-storage hybrid system includes: The voltage and current data of the photovoltaic power generation unit are obtained through the Boost converter in the photovoltaic power generation unit; the photovoltaic power generation is calculated based on the voltage and current data of the photovoltaic power generation unit. The voltage and current data of the energy storage battery are obtained by the Boost converter in the energy storage battery, and the energy storage power is calculated based on the voltage and current data of the energy storage battery. The power is determined based on the photovoltaic power generation capacity and energy storage capacity to determine the grid-side target power.

[0009] As a further improvement of the present invention, based on the current SOC state of the energy storage battery and the target power on the grid side, a corresponding control mode is determined to control the photovoltaic-energy storage hybrid system, including: If the current SOC state of the energy storage battery is greater than or equal to 60% of the rated capacity, switch to frequency support mode to control the photovoltaic-storage hybrid system. If the current SOC of the energy storage battery is less than 60% of its rated capacity, switch to constant power mode to control the photovoltaic-storage hybrid system.

[0010] As a further improvement of the present invention, the constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, including: The output current and output voltage of the photovoltaic power generation unit are obtained. Based on the output current and output voltage of the photovoltaic power generation unit, the voltage and current dual-loop control of the Boost converter of the photovoltaic power generation unit is performed to obtain the maximum photovoltaic power. The photovoltaic power output is stabilized based on the maximum photovoltaic power. Based on the maximum photovoltaic power, the Boost converter in the energy storage battery is used for current loop control to adjust the charging / discharging of the energy storage battery and perform active power compensation. The adjusted active power from the photovoltaic power generation unit and the energy storage battery is output to the DC bus; Based on the modulated active power and with the target power on the grid side as the objective, the DC bus side implements a synchronous control strategy for the inverter by setting a matching coefficient and a virtual damping resistor, which combines voltage and current dual-loop amplitude control and matching control. At the same time, the DC bus voltage is adjusted to obtain an output voltage that matches the complex demands of the grid.

[0011] As a further improvement of the present invention, in the constant power mode, the synchronous control frequency of the inverter is:

[0012] in, Angular frequency, As the reference frequency, For matching coefficients, For virtual damping resistance, The power measured on the DC side, To measure the power of AC, This is the DC bus voltage. This is the reference voltage for the DC bus.

[0013] As a further improvement of the present invention, the frequency support mode employs a droop control strategy to control the energy storage battery, including: The DC bus side is processed by a low-pass filter based on the set droop controllable coefficient of the inverter output to obtain the filtered active power. The inverter employs a droop control strategy to regulate the AC side voltage and frequency.

[0014] As a further improvement of the present invention, the droop control frequency of the inverter is:

[0015] In the formula, 2 is the angular frequency. As a reference for angular frequency, This is the droop control coefficient. As the active power reference, To measure the active power, For the bandwidth of the low-pass filter Secondly, the present invention provides a grid-type control system for a photovoltaic-storage hybrid system, for implementing the above-mentioned grid-type control method for a photovoltaic-storage hybrid system, comprising: The data acquisition module acquires the operating data of the photovoltaic power generation unit, photovoltaic inverter, and energy storage battery in the photovoltaic-storage hybrid system, determines the grid-side target power based on the operating data, and collects the SOC status of the energy storage battery. The system control module determines the corresponding control mode to control the photovoltaic-storage hybrid system based on the current SOC state of the energy storage battery and the target power on the grid side. The control modes include constant power mode and frequency support mode; The constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, adjusting the AC and DC voltages to meet the grid-side target power. The frequency support mode employs a droop control strategy to control the energy storage battery, adjusting the AC side voltage and frequency to meet the grid-side target power.

[0016] Thirdly, the present invention provides a computer-readable storage medium for storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform the above-described network control method for a hybrid optical-storage system.

[0017] Fourthly, the present invention provides a computing device, comprising: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including steps for performing the above-described network control method for a hybrid optical-storage system.

[0018] The beneficial effects of this invention are as follows: This invention provides a grid-based control method for photovoltaic-storage hybrid systems. In constant power mode, adjusting the AC and DC side voltages can stabilize the output power. In frequency support mode, the AC voltage and frequency are adjusted through the droop control of the energy storage battery, directly responding to grid frequency fluctuations and effectively solving the grid power imbalance problem caused by photovoltaic intermittency (such as sudden changes in sunlight), thus improving the power supply reliability of microgrids or grid-connected systems. This invention dynamically selects the control mode based on the SOC (State of Charge) of the energy storage battery: when the SOC is low, the constant power mode is used first to fully utilize photovoltaic power generation and reduce the number of charge-discharge cycles of the energy storage battery; when the SOC is high or the grid demand requires a rapid response, it switches to frequency support mode, where the energy storage battery provides frequency support, avoiding overcharging and over-discharging. This intelligent switching strategy based on SOC extends the cycle life of the energy storage battery, while reducing unnecessary energy loss and improving the overall system's energy utilization efficiency.

[0019] The system adopts a dual-mode operating mechanism that combines novel matching control and conventional droop control. It automatically selects the most suitable operating mode based on the SOC state of the energy storage battery and the target power on the grid side. This ensures the system's frequency support capability when the energy storage battery SOC is high and the stability of the DC bus voltage when the energy storage battery SOC is low. It effectively overcomes the problem of reduced grid inertia caused by the traditional maximum power output control strategy not responding to changes in grid power demand.

[0020] Furthermore, this invention couples the outputs of the Boost converters of the photovoltaic power generation unit and the energy storage battery to form a unified DC bus, and adjusts the characteristics of the DC bus through the closed-loop control of the Boost converter, thereby realizing the coordinated operation of the photovoltaic power generation and energy storage system. This effectively solves the problem of lack of coordinated allocation between grid-connected power and storage power caused by the hybrid energy storage system being controlled as a whole in traditional control methods, and improves the stability and response speed of the system.

[0021] Furthermore, by introducing virtual resistance and matching coefficient into the novel matching control strategy, this invention achieves precise adjustment of the AC side voltage amplitude and also has the function of actively adjusting the DC bus voltage, thus solving the problem of insufficient accuracy and real-time performance of existing photovoltaic-storage collaborative grid control methods in measuring real-time maximum available photovoltaic output power.

[0022] Furthermore, this invention employs a dual-mode switching mechanism. When the output power of photovoltaic power generation fluctuates, the energy storage battery can actively compensate by adjusting its power injection to maintain a stable power supply to the grid, effectively suppressing inter-system harmonics and improving the stable operation performance of the system.

[0023] Furthermore, this invention achieves adaptive and stable operation of the system under different operating conditions by using reasonable state criteria (frequency support mode when BESS power is sufficient, and constant power mode when BESS power is insufficient), effectively solving the problem that the control algorithm in the prior art does not have an ideal effect on interharmonic suppression. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is the circuit schematic of the dual-mode grid-type system based on photovoltaic-storage hybrid energy proposed in this invention.

[0026] Figure 2 shows the control block diagrams for the two network configuration modes proposed in this invention. (a) is the control principle diagram of the system when using the constant power mode; (b) is the control principle diagram of the system when using the frequency support mode.

[0027] Figure 3 These are the state-space pole diagrams of the two control methods proposed in this invention.

[0028] Figure 4 shows typical waveforms of the system under two control modes. (a) shows a partial waveform of the system in the frequency support mode with droop control, and (b) shows a partial waveform of the system in the constant power mode with matched control.

[0029] Figure 5 These are waveforms showing the working states of the two modes and the transient response during switching.

[0030] Figure 6 This is a schematic diagram of the electronic device structure in this invention. Detailed Implementation

[0031] To make the objectives and technical solutions of this invention clearer and easier to understand, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Example 1 This embodiment discloses a grid-based control method for a photovoltaic-storage hybrid system. This control method has strong adaptability and two grid-based operating modes. Based on the state of the energy storage battery and the grid-side requirements, it automatically selects between constant power mode and frequency support mode, effectively adapting to new energy power plants and different power system needs. The specific implementation method is as follows.

[0034] like Figure 1 As shown, the structure of the photovoltaic-storage hybrid system in this embodiment is as follows: the energy supply of the system consists of two parts: a photovoltaic power generation unit and an energy storage battery. The two parts are coupled together through their respective Boost converters to form a unified DC bus. Through the closed-loop control of the Boost converter, the characteristics of the DC bus are adjusted to adapt to different inverter synchronization control strategy requirements.

[0035] Specifically, the Boost converter on the photovoltaic power generation unit side consists of a first inductor. First capacitor Second capacitor First photovoltaic switch tube Second photovoltaic switch Composed of components used to adjust voltage based on control commands. The photovoltaic power generation unit is connected to the DC bus via a Boost converter on the photovoltaic power generation unit side. (where C is the DC bus voltage and C is the bus support capacitor). The DC power output from the photovoltaic power generation unit is regulated by the Boost converter and then sent to the DC bus.

[0036] The energy storage battery-side Boost converter includes a second inductor. Third capacitor The first energy storage switch tube Second energy storage switch tube The energy storage battery is connected to the DC bus via a Boost converter on the battery side. It can perform bidirectional power flow: when there is excess photovoltaic power, the energy is stored in the energy storage battery; when there is insufficient photovoltaic power (such as at night or on cloudy days), the stored energy is released to maintain the stability of the system power supply.

[0037] The DC bus is used to couple the electrical energy output from the photovoltaic power generation unit and the energy storage battery, and after being regulated and filtered by the bus support capacitor, it provides a stable DC voltage for the subsequent circuits.

[0038] The DC bus is also connected to a grid-connected inverter, which has 6 switching transistors. ~ The three-phase full-bridge inverter circuit is composed of DC bus power and converts it into three-phase AC power, which is then connected to the power grid or supplied to AC loads.

[0039] The core control objective of this embodiment is to dynamically switch control modes based on the grid-side target power and the state of charge (SOC) of the energy storage battery, and ensure that the output of the photovoltaic-storage hybrid system matches the grid demand by precisely adjusting the voltage, frequency and active power, while ensuring the stability of system operation.

[0040] Acquire operational data of photovoltaic power generation units and energy storage batteries in a photovoltaic-storage hybrid system, determine the grid-side target power based on the operational data, and collect the SOC status of the energy storage batteries; Based on the current SOC state of the energy storage battery and the target power on the grid side, the corresponding control mode is determined to control the photovoltaic-storage hybrid system.

[0041] The control modes in this embodiment include constant power mode and frequency support mode; The constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, adjusting the AC and DC voltages to meet the grid-side target power. The frequency support mode employs a droop control strategy to control the energy storage battery, adjusting the AC side voltage and frequency to meet the grid-side target power.

[0042] Specifically, if the current SOC state of the energy storage battery is greater than or equal to 60% of the rated capacity, the system switches to frequency support mode to control the photovoltaic-storage hybrid system and utilizes the sufficient capacity of the energy storage battery to participate in grid frequency regulation. If the current SOC state of the energy storage battery is less than 60% of its rated capacity, switch to constant power mode to control the photovoltaic-energy storage hybrid system, prioritizing stable photovoltaic power output and avoiding over-discharge of the energy storage battery.

[0043] In the constant power mode shown in Figure 2(a), the photovoltaic power generation unit operates as the dominant power source, while the energy storage battery provides active power compensation to maintain the constant power source characteristics of the DC bus under different load conditions. In this mode, the inverter employs a novel matching control method. Based on the traditional matching control strategy, it adds virtual resistance and matching coefficients to achieve AC side voltage formation capability and grid frequency tracking function, while actively adjusting the DC bus voltage. Using the photovoltaic power generation unit as the main control object, combined with the active power compensation of the energy storage battery, stable system power output is achieved. The specific steps are as follows: The output voltage of the photovoltaic power generation unit is collected in real time through the Boost converter configured in the photovoltaic power generation unit. and output current Voltage-current dual-loop control is achieved through a Boost converter, which controls the output voltage of the photovoltaic power generation unit. The voltage threshold of the photovoltaic (PV) power generation unit is input to the voltage controller. The voltage loop stabilizes the output voltage, and the current loop tracks the maximum current reference value, ultimately enabling the PV power generation unit to operate at its maximum power point and output maximum PV power. Based on the difference between the maximum PV power and the grid target power, current loop control is implemented through the Boost converter of the energy storage battery: when the maximum PV power is greater than the grid target power, the energy storage battery is controlled to charge (absorbing excess power); when the maximum PV power is less than the grid target power, the energy storage battery is controlled to discharge (supplementing the power gap), achieving dynamic compensation of active power.

[0044] The active power from the photovoltaic power generation units and energy storage batteries is aggregated at the DC bus and then converted into AC power by an inverter before being output to the grid. To match the output with the complex demands of the grid, the inverter employs voltage loop and phase-locked loop synchronous control. The core principle is to adjust the output frequency by setting a matching coefficient (N) and a virtual damping resistor (R). The synchronous control frequency is as follows:

[0045] in, Angular frequency, As the reference frequency, For matching coefficients, For virtual damping resistance, The power measured on the DC side, To measure the power of AC, This is the DC bus voltage. This is the reference voltage for the DC bus.

[0046] As shown in Figure 2(b), in the frequency support mode, the energy storage battery operates as the primary power source. The frequency support mode employs a droop control strategy, with the energy storage battery as the main control object, participating in grid frequency regulation. The specific steps are as follows: The output voltage of the photovoltaic power generation unit is collected in real time through the Boost converter configured in the photovoltaic power generation unit. and output current Voltage-current dual-loop control is achieved through a Boost converter, which controls the output voltage of the photovoltaic power generation unit. The voltage threshold of the photovoltaic power generation unit is input to the voltage controller. The voltage loop stabilizes the output voltage, and the current loop tracks the maximum current reference value, ultimately enabling the photovoltaic power generation unit to operate at the maximum power point and output the maximum photovoltaic power.

[0047] Based on the difference between the maximum photovoltaic power and the grid target power, current loop and voltage control are performed through the Boost converter of the energy storage battery: when the maximum photovoltaic power is greater than the grid target power, the energy storage battery is controlled to charge (absorb excess power); when the maximum photovoltaic power is less than the grid target power, the energy storage battery is controlled to discharge (make up for the power gap), thus realizing dynamic compensation of active power.

[0048] The active power output from the inverter is collected on the DC bus side and filtered by a low-pass filter to eliminate power fluctuation interference and obtain a smooth active power signal.

[0049] The inverter uses a droop control strategy to regulate the AC side voltage and frequency based on the filtered active power.

[0050] in, Angular frequency, As the reference frequency, For matching coefficients, For virtual damping resistance, The power measured on the DC side, To measure the power of AC, This is the DC bus voltage. This is the DC bus reference voltage. When the grid frequency deviates from the reference, the energy storage battery regulates the active power output through charging and discharging, causing the inverter frequency to exhibit a drooping characteristic with changes in active power, thereby supporting grid frequency stability. For example, when the grid frequency decreases, the active power output is increased to raise the frequency; when the frequency increases, the active power output is decreased to lower the frequency.

[0051] Figure 3 The state-space pole plots for two operating modes are shown, and their correctness is verified in the time-domain simulation shown in Figure 4. A step perturbation is applied to the grid voltage frequency at t=1.5s, followed by a voltage amplitude perturbation at t=2.0s. Figure 5 The dynamic characteristics of two control modes and the transient process during mode switching are demonstrated. When the output power of photovoltaic power generation fluctuates, the energy storage battery actively compensates by adjusting its power injection to maintain a stable power supply to the grid. At t = 3.5s, a mode switch was performed, and the AC measurement showed only a frequency fluctuation of no more than 3%. This confirms the feasibility of dual-mode switching.

[0052] The control method in this embodiment achieves the following effect: When the grid conditions are poor (significant frequency fluctuations), it actively switches to frequency support mode, where the energy storage boost converter uses voltage outer loop control to replace the DC voltage regulation function of the inverter in constant power mode. At this time, droop control only handles the AC side frequency / voltage, and the energy storage boost converter independently stabilizes the DC side voltage; it blocks the transmission path of grid frequency disturbances to the DC side, reduces DC side voltage fluctuations, and extends equipment lifespan.

[0053] Example 2 This embodiment discloses a grid-type control system for a photovoltaic-storage hybrid system, used to implement the grid-type control method for the photovoltaic-storage hybrid system in this embodiment. The system includes: The data acquisition module acquires the operating data of the photovoltaic power generation unit, photovoltaic inverter, and energy storage battery in the photovoltaic-storage hybrid system, determines the grid-side target power based on the operating data, and collects the SOC status of the energy storage battery. The system control module determines the corresponding control mode to control the photovoltaic-storage hybrid system based on the current SOC state of the energy storage battery and the target power on the grid side. The control modes include constant power mode and frequency support mode; The constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, adjusting the DC-side voltage and frequency to meet the grid-side target power. The frequency support mode employs a droop control strategy to control the energy storage battery and adjust the AC side voltage to meet the grid-side target power.

[0054] Example 3 In another embodiment of the present invention, a computer-readable storage medium is provided as a storage component within a terminal device, the function of which is to store programs and data. It should be noted that the computer-readable storage medium here encompasses not only the built-in storage components of the terminal device but also extended storage components supported by the device. Essentially, it is a tangible medium capable of containing or storing programs that can be invoked by or in conjunction with an instruction execution system, device, or apparatus. This storage medium provides storage areas for the terminal's operating system and stores one or more instructions suitable for processor loading and execution, which can constitute one or more computer programs containing program code.

[0055] Specifically, examples of computer-readable storage media (a non-exclusive list) include: electrical connections with one or more wires, portable disks, hard disks, random access memory, read-only memory, erasable programmable read-only memory, optical fibers, portable optical disc read-only memory, optical storage devices, magnetic storage devices, or any reasonable combination of the above types.

[0056] The storage medium may also include data signals propagated as part of a baseband portion or a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any reasonable combination of both. Furthermore, computer-readable storage medium may also refer to other readable media besides conventional readable storage media, capable of sending, propagating, or transmitting programs for use or operation by an instruction execution system, apparatus, or device. Program code on the storage medium can be transmitted via any suitable medium, including but not limited to wireless, wired, optical fiber, or any reasonable combination thereof.

[0057] The program code used to implement the operations of this invention can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C. The execution modes of the program code include: running entirely on the user's computing device, running partially on the user's device as a standalone software package, running partially in a distributed manner on both the user's device and a remote computing device, or running entirely on a remote computing device or server. When a remote computing device is involved, the device can be connected to the user's computing device via any type of network such as a local area network (LAN) or a wide area network (WAN), or connected to an external computing device via the Internet through an Internet service provider.

[0058] The processor is capable of loading and executing one or more instructions stored in a computer-readable storage medium to implement the corresponding steps of the network control method for a hybrid optical-storage system described in Example 1.

[0059] Example 4 Figure 6 This is a schematic diagram of a computer device provided according to an embodiment of the present invention.

[0060] Please see Figure 6 The terminal device is a computer device. In this embodiment, the computer device 60 includes a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When executed by the processor 61, the computer program 63 implements the network-type control method for the optical-storage hybrid system described in this embodiment. To avoid repetition, this will not be described in detail here. Alternatively, when executed by the processor 61, the computer program 63 implements the functions of each model / unit in the computing system composed of the network-type control method for the optical-storage hybrid system described in this embodiment. To avoid repetition, this will not be described in detail here.

[0061] Computer device 60 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. Computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art will understand that... Figure 6This is merely an example of computer device 60 and does not constitute a limitation on computer device 60. It may include more or fewer components than shown, or combine certain components, or different components. For example, computer device may also include input / output devices, network access devices, buses, etc.

[0062] The processor 61 may be a central processing unit (CPU), or other general-purpose processors, CPUs, graphics processing units (GPUs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, quantum computing-based data processing logic units, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0063] The memory 62 can be an internal storage unit of the computer device 60, such as a hard disk or RAM of the computer device 60. The memory 62 can also be an external storage device of the computer device 60, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on the computer device 60.

[0064] Furthermore, the memory 62 may include both internal storage units of the computer device 60 and external storage devices. The memory 62 is used to store computer programs and other programs and data required by the computer device. The memory 62 can also be used to temporarily store data that has been output or will be output.

[0065] Any references to memory, databases, or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0066] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

Claims

1. A grid-type control method for a photovoltaic-storage hybrid system, characterized in that, include: Acquire operational data of photovoltaic power generation units and energy storage batteries in a photovoltaic-storage hybrid system, determine the grid-side target power based on the operational data, and collect the SOC status of the energy storage batteries; Based on the current SOC state of the energy storage battery and the target power on the grid side, the corresponding control mode is determined to control the photovoltaic-storage hybrid system. The control modes include constant power mode and frequency support mode; The constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, adjusting the AC and DC voltages to meet the grid-side target power. The frequency support mode employs a droop control strategy to control the energy storage battery, adjusting the AC side voltage and frequency to meet the grid-side target power.

2. The grid-type control method for a photovoltaic-storage hybrid system according to claim 1, characterized in that, Acquire operational data from the photovoltaic power generation units and energy storage batteries in the photovoltaic-storage hybrid system, including: The voltage and current data of the photovoltaic power generation unit are obtained through the Boost converter in the photovoltaic power generation unit; the photovoltaic power generation is calculated based on the voltage and current data of the photovoltaic power generation unit. The voltage and current data of the energy storage battery are obtained by the Boost converter in the energy storage battery, and the energy storage power is calculated based on the voltage and current data of the energy storage battery. The power is determined based on the photovoltaic power generation capacity and energy storage capacity to determine the grid-side target power.

3. The grid-type control method for a photovoltaic-storage hybrid system according to claim 1, characterized in that, Based on the current SOC state of the energy storage battery and the target power on the grid side, a corresponding control mode is determined to control the photovoltaic-energy storage hybrid system, including: If the current SOC state of the energy storage battery is greater than or equal to 60% of the rated capacity, switch to frequency support mode to control the photovoltaic-storage hybrid system. If the current SOC of the energy storage battery is less than 60% of its rated capacity, switch to constant power mode to control the photovoltaic-storage hybrid system.

4. The grid-type control method for a photovoltaic-storage hybrid system according to claim 3, characterized in that, The constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, including: The output current and output voltage of the photovoltaic power generation unit are obtained. Based on the output current and output voltage of the photovoltaic power generation unit, the voltage and current dual-loop control of the Boost converter of the photovoltaic power generation unit is performed to obtain the maximum photovoltaic power. The photovoltaic power output is stabilized based on the maximum photovoltaic power. Based on the maximum photovoltaic power, the Boost converter in the energy storage battery is used for current loop control to adjust the charging / discharging of the energy storage battery and perform active power compensation. The adjusted active power from the photovoltaic power generation unit and the energy storage battery is output to the DC bus; Based on the modulated active power and with the target power on the grid side as the objective, the DC bus side implements a synchronous control strategy for the inverter by setting a matching coefficient and a virtual damping resistor, which combines voltage and current dual-loop amplitude control and matching control. At the same time, the DC bus voltage is adjusted to obtain an output voltage that matches the complex demands of the grid.

5. The grid configuration control method for a photovoltaic-storage hybrid system according to claim 4, characterized in that, In the constant power mode, the inverter's synchronous control frequency is: in, 1 represents the angular frequency. As the reference frequency, For matching coefficients, For virtual damping resistance, The power measured on the DC side, To measure the power of AC, This is the DC bus voltage. This is the reference voltage for the DC bus.

6. The grid configuration control method for a photovoltaic-storage hybrid system according to claim 3, characterized in that, The frequency support mode employs a droop control strategy to control the energy storage battery, including: The DC bus side is processed by a low-pass filter based on the set droop controllable coefficient of the inverter output to obtain the filtered active power. The inverter employs a droop control strategy to regulate the AC side voltage and frequency.

7. The grid-type control method for a photovoltaic-storage hybrid system according to claim 6, characterized in that, The inverter's droop control frequency is: In the formula, 2 is the angular frequency. As a reference for angular frequency, This is the droop control coefficient. As the active power reference, To measure the active power, This represents the bandwidth of the low-pass filter.

8. A grid-type control system for a photovoltaic-storage hybrid system, used to implement the grid-type control method for a photovoltaic-storage hybrid system as described in any one of claims 1 to 7, characterized in that, include: The data acquisition module acquires the operating data of the photovoltaic power generation unit, photovoltaic inverter, and energy storage battery in the photovoltaic-storage hybrid system, determines the grid-side target power based on the operating data, and collects the SOC status of the energy storage battery. The system control module determines the corresponding control mode to control the photovoltaic-storage hybrid system based on the current SOC state of the energy storage battery and the target power on the grid side. The control modes include constant power mode and frequency support mode; The constant power mode employs a novel matching control strategy to control the photovoltaic power generation unit, adjusting the AC and DC voltages to meet the grid-side target power. The frequency support mode employs a droop control strategy to control the energy storage battery, adjusting the AC side voltage and frequency to meet the grid-side target power.

9. A computer-readable storage medium for storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform the grid-type control method for a hybrid optical-storage system as described in any one of claims 1 to 7.

10. A computing device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including steps for performing the network control method for a hybrid optical-storage system according to any one of claims 1 to 7.

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