Adaptive reactive power phase angle droop control method and system based on state of charge perception

Abstract

The application provides a kind of adaptive reactive phase angle droop control method and system based on state of charge perception, by real-time sensing energy storage unit state of charge (SOC), adaptive active amplitude and reactive phase angle adaptive reactive phase angle droop controller is constructed, the power distribution weight of each unit is dynamically adjusted, and the SOC balance of energy storage converter is realized. At the same time, in order to meet the demand of frequency sensitive load, the frequency is locked by directly modifying the phase angle in the reactive control loop, and the frequency stability in the dynamic power regulation process is ensured. The application can realize the accurate autonomous balance of the aggregated power of each distributed energy storage converter cluster under off-grid operation, provide network support for voltage and frequency at the point of common coupling, and improve the operation reliability and power quality of the energy storage converter cluster.

Description

Technical Field

[0001] This invention relates to the field of automation control technology, and in particular to an adaptive reactive phase angle droop control method and system based on state of charge sensing. Background Technology

[0002] Currently, large-scale distributed energy storage batteries aggregate energy through converter clusters, which can provide AC power for microgrids with a high proportion of new energy sources. Their control performance directly determines the power quality of the microgrid, such as voltage and frequency.

[0003] When a microgrid is operated off-grid, energy storage converter clusters supply power in parallel, primarily using droop control to achieve power distribution among the parallel units. However, traditional parallel droop control for converters often employs a fixed gain, failing to detect differences in the state of charge (SOC) of the energy storage batteries. In actual operation, inconsistent SOCs among the energy storage units can easily lead to overloaded low-charge units and insufficient output from high-charge units, resulting in uneven energy storage utilization and shortened system lifespan.

[0004] Traditional reactive power-frequency droop control can cause instantaneous frequency fluctuations when adjusting reactive power balance. Under off-grid operation conditions, these frequency fluctuations can easily exceed the safe range of frequency-sensitive loads, leading to system instability or equipment damage, and making it difficult to meet the energy management and power quality requirements in complex scenarios. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an adaptive reactive phase droop control method and system based on state of charge (SOC) sensing. Through an effective constant frequency control scheme, it achieves adaptive balanced output of the energy storage cluster's SOC, suppresses dynamic frequency fluctuations in the microgrid, and balances energy management efficiency with grid stability.

[0006] On the one hand, the present invention provides an adaptive reactive phase droop control method based on state of charge sensing, comprising: The inverter's multidimensional state variables are obtained, including voltage, current signals, and the state of charge of the energy storage unit. The active power, reactive power of the inverter, and global average state of charge of the DC-side energy storage battery pack of the inverter module are calculated based on multi-dimensional state variables. Based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC side energy storage battery pack of the inverter module, the adaptive droop coefficient is dynamically calculated, an adaptive reactive phase angle droop controller is constructed, and the instantaneous reference voltage is obtained through the adaptive reactive phase angle droop controller. The instantaneous reference voltage is used for voltage and current dual closed-loop control to obtain a single-phase voltage modulation signal, which is used to adjust the active power and reactive power output until the state of charge of the inverter's DC-side energy storage battery pack tends to be the same.

[0007] Furthermore, the formula for calculating the global average state of charge is:

[0008] in, This represents the global average state of charge (SOC) of the DC-side energy storage battery pack in the inverter module. and The first i The capacity and state of charge of energy storage batteries. This represents the total number of online energy storage battery modules in the system.

[0009] Furthermore, the adaptive droop coefficient includes: active droop coefficient and reactive droop coefficient.

[0010] Furthermore, for active power regulation, the adaptive reactive power droop controller uses the product of the adaptive active power droop coefficient and the active power as a voltage amplitude adjustment command to adjust the active power output; while for reactive power regulation, it uses the product of the adaptive reactive power droop coefficient and the reactive power as a phase angle adjustment command to adjust the reactive power output.

[0011] Furthermore, the adaptive reactive phase droop controller includes:

[0012] in, and These are the original reference voltage amplitude and phase angle of the i-th inverter module in the parallel inverter, respectively; and Let be the active and reactive power outputs of the i-th inverter module, respectively. and These are the adaptive active power droop coefficient and reactive power droop coefficient, respectively. This is the secondary control transfer function used for voltage sag compensation. This represents the voltage amplitude at the common point of parallel connection of the inverters; This is a reactive power control law; It is a secondary control transfer function.

[0013] Furthermore, the final reference voltage formula obtained through the adaptive reactive phase angle droop controller is as follows:

[0014] in, This is the instantaneous reference voltage generated after passing through the adaptive reactive phase angle droop controller; .

[0015] On the other hand, an adaptive reactive phase droop control system based on state-of-charge sensing is provided, including: Signal acquisition module: Acquires multi-dimensional state variables of the inverter, including voltage, current signals and state of charge of energy storage units; calculates the active power, reactive power of the inverter and the global average state of charge of the DC side energy storage battery pack of the inverter module based on the multi-dimensional state variables. Adaptive reactive phase angle droop controller module: Based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC side energy storage battery pack of the inverter module, the adaptive droop coefficient is dynamically calculated; based on the adaptive droop coefficient, an adaptive reactive phase angle droop controller is constructed, and the instantaneous reference voltage is obtained through the adaptive reactive phase angle droop controller. The regulation module performs dual closed-loop control of voltage and current for the instantaneous reference voltage to obtain a single-phase voltage modulation signal, and regulates the active and reactive power outputs until the state of charge of the inverter's DC-side energy storage battery pack tends to be the same.

[0016] Furthermore, an electronic device is also provided, including: Memory, used for non-transitory storage of computer-readable instructions; and Processor, for executing the computer-readable instructions, When the computer-readable instructions are executed by the processor, they perform the method described in the first aspect above.

[0017] In another aspect, a storage medium is also provided for non-transitory storage of computer-readable instructions, wherein when the non-transitory computer-readable instructions are executed by a computer, the method described in the first aspect is performed.

[0018] In another aspect, a computer program product is also provided, including a computer program that, when run on one or more processors, is used to implement the method described in the first aspect above.

[0019] The above technical solution has the following advantages or beneficial effects: This invention discloses an adaptive reactive phase droop control method and system based on state-of-charge sensing. It achieves autonomous energy balance and balanced optimization of energy storage lifetime within the inverter parallel system, effectively solving the battery loss problem caused by uneven energy distribution in traditional control. Combined with a frequency-stabilized mechanism established by reactive phase droop logic, it reduces frequency deviation during reactive power regulation, significantly improving the operational safety of frequency-sensitive loads. Furthermore, while suppressing transient circulating currents and improving power quality at the common coupling point, this invention balances the flexibility of local control with the robustness of global coordination, providing highly reliable voltage and frequency support for off-grid microgrids. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a flowchart of an adaptive reactive phase droop control method based on state of charge sensing disclosed in an embodiment of the present invention; Figure 2 This is a circuit topology diagram of a parallel inverter system disclosed in an embodiment of the present invention; Figure 3 This is a schematic diagram of an adaptive reactive phase droop control method based on state of charge sensing disclosed in an embodiment of the present invention; Figure 4 This is a waveform diagram of an experiment of an inverter parallel system disclosed in an embodiment of the present invention; Figure 5 This is a waveform diagram of a parallel coupling point frequency change experiment disclosed in an embodiment of the present invention. Detailed Implementation

[0022] 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.

[0023] 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 exemplary embodiments of the invention. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] In this embodiment of the invention, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of this invention, "multiple" refers to two or more.

[0025] Furthermore, to facilitate a clear description of the technical solutions of the embodiments of the present invention, the terms "first" and "second" are used in the embodiments of the present invention to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0026] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0027] All data acquisition in this embodiment is carried out in accordance with laws and regulations and with user consent, and the data is used legally.

[0028] Example 1 This embodiment provides an adaptive reactive phase droop control method based on state-of-charge sensing, such as... Figure 1 As shown, the specific steps include: S1: Obtain the multi-dimensional state variables of the inverter, including voltage, current signals and the state of charge of the energy storage unit; calculate the active power, reactive power of the inverter and the global average state of charge of the DC side energy storage battery pack of the inverter module based on the multi-dimensional state variables. S2: Dynamically calculate the adaptive droop coefficient based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC side energy storage battery pack of the inverter module; construct an adaptive reactive phase angle droop controller based on the adaptive droop coefficient, and obtain the instantaneous reference voltage through the adaptive reactive phase angle droop controller. S3: Perform voltage and current dual closed-loop control on the instantaneous reference voltage to obtain a single-phase voltage modulation signal, and adjust the active power and reactive power output until the state of charge of the inverter's DC-side energy storage battery pack tends to be the same.

[0029] like Figure 2 As shown, the inverter parallel system consists of multiple inverters connected in parallel, and the DC side is a cluster of energy storage batteries. The DC bus voltage will change due to the power output. The state of charge (SOC) of the energy storage battery clusters often varies significantly, resulting in energy storage units with lower charge being still heavily loaded, while units with sufficient charge are not able to fully exert their power, leading to uneven energy storage utilization and shortening the system's operating life.

[0030] like Figure 3 As shown in the figure, the adaptive reactive phase angle droop control method based on state of charge sensing provided in this embodiment can achieve automatic output power balancing through a local droop controller, providing highly reliable voltage and frequency support for off-grid microgrids.

[0031] S1: Obtain the multi-dimensional state variables of the inverter, including voltage, current signals, and the state of charge of the energy storage units; calculate the active power, reactive power, and global average state of charge of the inverter module's DC-side energy storage battery pack based on the multi-dimensional state variables, specifically including: S11: Obtain the multi-dimensional state variables of the inverter, including: output voltage. and inductor current And the state of charge of the energy storage unit; In one embodiment, the inverter's battery SOC state is detected and collected by a aggregation controller.

[0032] S12: Obtain the active and reactive power output by the local module through power calculation and filtering, specifically including: The output voltage of the inverter unit is obtained using a synchronous sampling module. and inductor current For single-phase inverters, orthogonal components are generated using a virtual signal construction method, treating the original voltage and current signals as... Axis components are and And delay the original voltage and current signals. As Axis components are and .

[0033] Based on the instantaneous power theory formula: ,

[0034] in, and These represent the active and reactive power outputs of the local module, respectively.

[0035] The directly calculated power includes both DC and second-harmonic AC components. To improve control accuracy, a low-pass filter is needed to remove the AC component, thus obtaining the DC component for droop control. The transfer function of the low-pass filter is: ; Filtered active power and reactive power The expression is: , The cutoff frequency of the low-pass filter. It is 3.14 rad / s.

[0036] S13: Calculate the global average state of charge of the DC-side energy storage battery pack of the inverter module; In a parallel inverter system, the aggregation controller obtains the global average state of charge (SOC) of the DC-side energy storage battery pack of the inverter module from the SOC status of each module uploaded by each inverter module, and sends it to each module.

[0037] In one embodiment, the formula for calculating the global average state of charge is: (1) in, This represents the global average state of charge (SOC) of the DC-side energy storage battery pack in the inverter module. and The first i The capacity and state of charge of energy storage batteries. This represents the total number of online energy storage battery modules in the system.

[0038] S2: Based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC-side energy storage battery pack of the inverter module, dynamically calculate the adaptive droop coefficient; construct an adaptive reactive phase angle droop controller based on the adaptive droop coefficient, and obtain the instantaneous reference voltage through the adaptive reactive phase angle droop controller, specifically including: S21: Dynamically calculate the adaptive droop coefficient based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC side energy storage battery pack of the inverter module. In one embodiment, the expression for the adaptive droop coefficient is: (2) In the formula, and These are the active power droop coefficient and the reactive power droop coefficient, respectively. and Both are initial droop coefficients. and These are all adjustment coefficients, used to control the sensitivity of parameter adjustments.

[0039] This invention sets a dynamic proportional relationship between the droop coefficient and the state of charge of the energy storage unit, enabling units with sufficient power to share more load by adjusting their droop sensitivity, thereby achieving energy balance of aggregated resources.

[0040] S22: Construct an adaptive reactive phase angle droop controller based on the adaptive droop coefficient; In one embodiment, the adaptive reactive phase angle droop controller includes: (3) in, and These are the original reference voltage amplitude and phase angle of the i-th inverter module in the parallel inverter, respectively; and Let be the active and reactive power outputs of the i-th inverter module, respectively. and These are the adaptive active power droop coefficient and reactive power droop coefficient, respectively. This is the secondary control transfer function used for voltage sag compensation. This represents the voltage amplitude at the common point of parallel connection of the inverters.

[0041] For active power regulation, the adaptive reactive power droop controller uses the product of the adaptive active power droop coefficient and the active power as a voltage amplitude adjustment command to adjust the active power output; while for reactive power regulation, it uses the product of the adaptive reactive power droop coefficient and the reactive power as a phase angle adjustment command to adjust the reactive power output.

[0042] In one embodiment, the reactive power control law is: (4) The angular frequency of the inverter module output can be obtained by differentiating the reactive power control law: (5) When the system reaches steady state, the reactive power no longer changes, that is: At this point, the steady-state system frequency of all inverter units becomes the common coupling point frequency: Meanwhile, the SOC status of the DC-side energy storage batteries in all modules is consistent: .

[0043] To compensate for the bus voltage drop caused by active power amplitude droop control, the following measures are implemented: Secondary control of the point of common coupling voltage is added; when the bus voltage deviates from its rated value, compensation is achieved through integral control. The secondary control transfer function is: (6) In the formula, All are integral compensation coefficients.

[0044] Through integral compensation via secondary control, the voltage at the common coupling point can meet the requirements when the system reaches steady state. Simultaneously, the active power and reactive power output of each inverter output module are equal. ; .

[0045] S23: Instantaneous reference voltage is obtained through an adaptive reactive phase angle droop controller; In one embodiment, the reference voltage amplitude and reference phase angle obtained by the adaptive reactive phase angle droop controller are synthesized into the final reference voltage formula by the following equation: (7) in, This is the instantaneous reference voltage generated after passing through the adaptive reactive phase angle droop controller. Since the standard frequency of the microgrid is 50Hz... It is 314.16 rad / s.

[0046] In a parallel inverter system, if there is a deviation between the active and reactive power outputs of the inverter modules, the active and reactive power are adjusted by obtaining the amplitude and phase angle compensation values ​​through an adaptive reactive phase angle droop controller until the output active and reactive power are the same.

[0047] This invention can reduce system frequency fluctuations by controlling phase droop, which is beneficial for the operation of frequency-sensitive devices at the coupling point.

[0048] S3: Perform voltage and current dual closed-loop control on the instantaneous reference voltage to obtain a single-phase voltage modulation signal, and adjust the active and reactive power outputs until the state of charge of the inverter's DC-side energy storage battery pack tends to be the same. Specifically, this includes: For the instantaneous reference voltage, voltage and current dual closed-loop control is performed. The single-phase voltage modulation signal obtained from the dual closed-loop control is used to control the output of the inverter module through the SPWM modulation strategy, thereby adjusting the output active and reactive power.

[0049] When there are differences in the SOC of the DC-side energy storage battery of the inverter module, the power output is adjusted by setting an adaptive droop coefficient. Since the SOC difference is different, the droop coefficient is also different until the SOC of the DC-side energy storage battery of the inverter tends to be the same.

[0050] To verify the effectiveness of the proposed control strategy, this embodiment conducts tests under typical dynamic load conditions in the actual operation of the inverter-parallel microgrid system, comprehensively verifying the stability and robustness of the strategy.

[0051] The experimental parameters are shown in the table below:

[0052] Figure 4 and Figure 5 The experimental results of this embodiment are presented. Figure 4 Figures (a) and (b) show the waveforms of the active and reactive power outputs of the inverter modules. During the steady-state operation phase from 0 to 1.5 seconds, the active and reactive power outputs of the two inverters are precisely evenly distributed. After a sudden load change at 1.5 seconds, the system can quickly adjust and reach a new power balance point, with reactive power increasing from 140Var to 280Var and active power correspondingly increasing from 0.9kW to 1.3kW.

[0053] Figure 4 Figure (c) shows the output current of the two inverter modules during load shedding, with a voltage reference amplitude of 311V. The waveforms show that the output current only experienced slight fluctuations during load switching, and after half a fundamental cycle, the output currents of the two inverters remained essentially consistent, further demonstrating the coordinated control capability of the strategy.

[0054] Figure 5 The waveform of frequency change at the coupling point under dynamic load variations is shown. Analysis reveals that the steady-state frequency of the adaptive reactive power droop system is strictly locked at the nominal value of 50Hz, unaffected by reactive load changes; while the frequency of traditional reactive power droop control increases with increasing reactive power output, exhibiting significant steady-state error. This invention not only eliminates static frequency offset but also greatly suppresses frequency oscillations during transient processes. This demonstrates the superiority of adaptive reactive power droop in maintaining system frequency stability.

[0055] In summary, the experimental results fully demonstrate that under various load-bearing scenarios, the proposed control strategy can effectively suppress transient impacts, improve voltage tracking accuracy, and accelerate dynamic response speed. Furthermore, the AC voltage and frequency at the coupling point remain stable and can quickly and accurately track the reference value. Simultaneously, the power distribution of the parallel inverters is balanced, and the circulating current is small. The effectiveness and engineering applicability of the proposed control strategy have been fully verified.

[0056] Example 2 This embodiment provides an adaptive reactive phase droop control system based on state-of-charge sensing, including: Signal acquisition module: Acquires multi-dimensional state variables of the inverter, including voltage, current signals and state of charge of energy storage units; calculates the active power, reactive power of the inverter and the global average state of charge of the DC side energy storage battery pack of the inverter module based on the multi-dimensional state variables. Adaptive reactive phase angle droop controller module: Based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC side energy storage battery pack of the inverter module, the adaptive droop coefficient is dynamically calculated; based on the adaptive droop coefficient, an adaptive reactive phase angle droop controller is constructed, and the instantaneous reference voltage is obtained through the adaptive reactive phase angle droop controller. The regulation module performs dual closed-loop control of voltage and current for the instantaneous reference voltage to obtain a single-phase voltage modulation signal, and regulates the active and reactive power outputs until the state of charge of the inverter's DC-side energy storage battery pack tends to be the same.

[0057] Example 3 This embodiment also provides an electronic device, including: one or more processors, one or more memories, and one or more computer programs; wherein, the processor is connected to the memory, and the one or more computer programs are stored in the memory. When the electronic device is running, the processor executes the one or more computer programs stored in the memory to cause the electronic device to perform the method described in Embodiment 1.

[0058] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0059] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, memory may also store information about the device type.

[0060] In the implementation process, each step of the above method can be completed by the integrated logic circuits in the processor hardware or by software instructions.

[0061] The method in Embodiment 1 can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, a detailed description is not provided here.

[0062] Those skilled in the art will recognize that the units and algorithm steps described in connection with the various examples of this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0063] Example 4 A storage medium that non-transitory stores computer-readable instructions, wherein when the non-transitory computer-readable instructions are executed by a computer, the method described in Embodiment 1 above is performed.

[0064] Example 5 This embodiment provides a computer program product, including a computer program that, when run on one or more processors, implements the method described in Embodiment 1 above.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0066] The technical solutions of the present invention can be described in conjunction with flowcharts or block diagrams of the methods, devices (systems), and computer program products of its embodiments: each flow, block, and combination of flow and block in the flowchart or block diagram can be implemented by computer program instructions. These instructions can be provided to the processor of a programmable data processing device such as a general-purpose computer, a special-purpose computer, or an embedded processor to generate a corresponding device to perform the function specified in the flowchart and block diagram; they can also be stored in a computer-readable storage device that can guide the device to operate in a specific manner, forming an article of manufacture containing instruction means to realize the above-mentioned specified function; they can also be loaded onto a programmable device such as a computer to provide processing steps to realize the corresponding function by executing a series of operation steps.

[0067] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, this is not intended to limit its scope of protection. Those skilled in the art should understand that various modifications or equivalent changes that can be made without creative effort based on the technical solutions disclosed in this invention should be included within the scope of protection of this invention.

Claims

1. An adaptive reactive phase angle droop control method based on state-of-charge sensing, characterized in that, include: The inverter's multidimensional state variables are obtained, including voltage, current signals, and the state of charge of the energy storage unit. The active power, reactive power, and global average state of charge of the inverter module's DC-side energy storage battery pack are calculated based on the multidimensional state variables. Based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC-side energy storage battery pack of the inverter module, the adaptive droop coefficient is dynamically calculated, and the expression is: ; in, and These are the active power droop coefficient and the reactive power droop coefficient, respectively. and Both are initial droop coefficients. and These are all adjustment coefficients, used to control the sensitivity of parameter adjustments; An adaptive reactive power phase angle droop controller is constructed based on an adaptive droop coefficient. For active power regulation, the adaptive reactive power phase angle droop controller uses the product of the adaptive active power droop coefficient and the active power as a voltage amplitude adjustment command to adjust the active power output; for reactive power regulation, it uses the product of the adaptive reactive power droop coefficient and the reactive power as a phase angle adjustment command to adjust the reactive power output. The adaptive reactive power phase angle droop controller includes: in, and These are the original reference voltage amplitude and phase angle of the i-th inverter module in the parallel inverter, respectively; and Let be the active and reactive power outputs of the i-th inverter module, respectively. and These are the adaptive active power droop coefficient and reactive power droop coefficient, respectively. This represents the voltage amplitude at the common point of parallel connection of the inverters; This is a reactive power control law; It is a secondary control transfer function; The instantaneous reference voltage is obtained through an adaptive reactive phase angle droop controller, using the following formula: ;in, This is the instantaneous reference voltage generated after passing through the adaptive reactive phase angle droop controller; ; The instantaneous reference voltage is used for voltage and current dual closed-loop control to obtain a single-phase voltage modulation signal, which is used to adjust the active power and reactive power output until the state of charge of the inverter's DC-side energy storage battery pack tends to be the same.

2. The adaptive reactive phase droop control method based on state-of-charge sensing according to claim 1, characterized in that, The formula for calculating the global average state of charge is: in, This represents the global average state of charge (SOC) of the DC-side energy storage battery pack in the inverter module. and The first i The capacity and state of charge of energy storage batteries. This represents the total number of online energy storage battery modules in the system.

3. The adaptive reactive phase droop control method based on state-of-charge sensing according to claim 1, characterized in that, The adaptive droop factor includes: active droop factor and reactive droop factor.

4. An adaptive reactive phase droop control system based on state-of-charge sensing, characterized in that, include: Signal acquisition module: Acquires multi-dimensional state variables of the inverter, including voltage, current signals and state of charge of energy storage units; calculates the active power, reactive power of the inverter and the global average state of charge of the DC side energy storage battery pack of the inverter module based on the multi-dimensional state variables. Adaptive reactive power droop controller module: Based on the state of charge of the inverter energy storage unit and the global average state of charge of the DC-side energy storage battery pack of the inverter module, it dynamically calculates the adaptive droop coefficient; the expression for the adaptive droop coefficient is: In the formula, and These are the active power droop coefficient and the reactive power droop coefficient, respectively. and Both are initial droop coefficients. and These are all adjustment coefficients, used to control the sensitivity of parameter adjustments; An adaptive reactive power phase angle droop controller is constructed based on an adaptive droop coefficient. For active power regulation, the adaptive reactive power phase angle droop controller uses the product of the adaptive active power droop coefficient and the active power as a voltage amplitude adjustment command to adjust the active power output; for reactive power regulation, it uses the product of the adaptive reactive power droop coefficient and the reactive power as a phase angle adjustment command to adjust the reactive power output. The adaptive reactive power phase angle droop controller includes: in, and These are the original reference voltage amplitude and phase angle of the i-th inverter module in the parallel inverter, respectively; and Let be the active and reactive power outputs of the i-th inverter module, respectively. and These are the adaptive active power droop coefficient and reactive power droop coefficient, respectively. This represents the voltage amplitude at the common point of parallel connection of the inverters; This is a reactive power control law; It is a secondary control transfer function; The instantaneous reference voltage is obtained through an adaptive reactive phase angle droop controller, using the following formula: in, This is the instantaneous reference voltage generated after passing through the adaptive reactive phase angle droop controller; ; The regulation module performs dual closed-loop control of voltage and current for the instantaneous reference voltage to obtain a single-phase voltage modulation signal, and regulates the active and reactive power outputs until the state of charge of the inverter's DC-side energy storage battery pack tends to be the same.

5. An electronic device, characterized in that, include: Memory is used to store computer-readable instructions in a non-transitory manner. as well as Processor, for executing the computer-readable instructions, When the computer-readable instructions are executed by the processor, they perform an adaptive reactive phase droop control method based on state-of-charge awareness as described in any one of claims 1-3.

6. A storage medium, characterized in that, Non-transitory stored computer-readable instructions, wherein when the non-transitory computer-readable instructions are executed by a computer, the adaptive reactive phase droop control method based on state-of-charge awareness as described in any one of claims 1-3 is executed.

7. A computer program product, characterized in that, Includes a computer program, which, when running on one or more processors, implements the adaptive reactive phase droop control method based on state-of-charge awareness as described in any one of claims 1-3.

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