Method and device for adjusting optical storage system and nonvolatile storage medium

Abstract

The invention discloses an adjusting method and device of an optical storage system and a nonvolatile storage medium. The method comprises the following steps: acquiring the output frequency and the output voltage of the optical storage system; calculating a difference value between the output frequency and a preset reference frequency, and determining a frequency deviation; calculating a difference value between the output voltage and a preset reference voltage, and determining a voltage deviation; determining an active power droop coefficient according to the frequency deviation; determining a reactive power droop coefficient according to the voltage deviation; according to the active power droop coefficient and the reactive power droop coefficient, the output frequency and the output voltage of the optical storage system are changed by adjusting the active power output and the reactive power output of the optical storage system, and the target output frequency and the target output voltage of the optical storage system are obtained. The technical problem of poor anti-disturbance capability of the optical storage system caused by frequency and voltage change of the micro-grid due to load disturbance or environment disturbance at present is solved.

Description

Technical Field

[0001] The present invention relates to the field of control of an optical storage system, and in particular to an adjustment method, device and non-volatile storage medium of an optical storage system. Background Art

[0002] The original intention of using renewable energy is to reduce the use of fossil fuels and reduce the environmental problems caused by fossil energy consumption. As a kind of distributed power source, the photovoltaic storage system has good energy supply efficiency. In order to reduce energy waste, the maximum power output is used as its control target during use. However, load disturbances or environmental disturbances will cause frequency and voltage changes. Traditional droop control leads to poor anti-disturbance ability of photovoltaic storage systems, so it is necessary to improve the traditional droop control strategy.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present invention provide an adjustment method, device and non-volatile storage medium for a photovoltaic storage system, so as to at least solve the current technical problem that the photovoltaic storage system has poor anti-disturbance capability due to frequency and voltage changes of a microgrid caused by load disturbance or environmental disturbance.

[0005] According to one aspect of an embodiment of the present invention, there is provided an adjustment method for a photovoltaic storage system, comprising: obtaining the output frequency and output voltage of the photovoltaic storage system; calculating the difference between the output frequency and a preset reference frequency to determine the frequency deviation; calculating the difference between the output voltage and a preset reference voltage to determine the voltage deviation; determining an active power droop coefficient according to the frequency deviation; determining a reactive power droop coefficient according to the voltage deviation; and changing the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system according to the active power droop coefficient and the reactive power droop coefficient to obtain a target output frequency and a target output voltage of the photovoltaic storage system.

[0006] Optionally, the active power droop coefficient is determined according to the frequency deviation, including: obtaining an initial active power droop coefficient and an active power adaptive coefficient, wherein the active power adaptive coefficient characterizes the degree of influence of the frequency deviation on the active power droop coefficient; substituting the initial active power droop coefficient, the frequency deviation and the active power adaptive coefficient into a first preset formula to determine the active power droop coefficient.

[0007] Optionally, the first preset formula is as follows: f =mk f (erf(|Δf|)+1), where M f is the active power droop coefficient, m is the initial active power droop coefficient, k fis the active power adaptive coefficient, erf(|Δf|)+1) is the preset error function, and Δf is the frequency deviation.

[0008] Optionally, the reactive power droop coefficient is determined according to the voltage deviation, including: obtaining an initial reactive power droop coefficient and a reactive power adaptive coefficient, wherein the reactive power adaptive coefficient characterizes the degree of influence of the voltage deviation on the reactive power droop coefficient; substituting the initial reactive power droop coefficient, the voltage deviation and the reactive power adaptive coefficient into a second preset formula to determine the reactive power droop coefficient.

[0009] Optionally, the second preset formula is as follows: v =nk v (erf(|Δv|+1), where M v is the reactive power droop coefficient, n is the initial reactive power droop coefficient, ΔV is the voltage deviation, k v is the coefficient of the preset reactive power adaptive droop coefficient term, and erf(|ΔV|)+1) is the preset error function.

[0010] Optionally, according to the active power droop coefficient, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, including: according to the active power droop coefficient and a preset first adjustment formula, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, wherein the first adjustment formula is as follows: f = f n -M f (PP n ), where f is the output frequency, f n is the reference frequency, M f is the active power droop coefficient, P is the active power output of the solar energy storage system, and P n is the preset reference active power.

[0011] Optionally, according to the reactive power droop coefficient, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, including: according to the reactive power droop coefficient and a preset second adjustment formula, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, wherein the second adjustment formula is as follows: V = V n -M v Q, where M v is the reactive power droop coefficient, V is the output voltage, V n is the reference voltage, and Q is the reactive power output by the photovoltaic storage system.

[0012] According to another aspect of an embodiment of the present invention, there is also provided an adjustment device for a photovoltaic storage system, comprising: an acquisition module for acquiring the output frequency and output voltage of the photovoltaic storage system; a first calculation module for calculating the difference between the output frequency and a preset reference frequency to determine the frequency deviation; a second calculation module for calculating the difference between the output voltage and a preset reference voltage to determine the voltage deviation; a first determination module for determining an active power droop coefficient according to the frequency deviation; a second determination module for determining a reactive power droop coefficient according to the voltage deviation; and an adjustment module for changing the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system according to the active power droop coefficient and the reactive power droop coefficient to obtain a target output frequency and a target output voltage of the photovoltaic storage system.

[0013] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, the non-volatile storage medium including a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute any one of the above-mentioned adjustment methods for the optical storage system.

[0014] According to another aspect of the embodiments of the present invention, a computer device is provided. The computer device includes a processor, and the processor is used to run a program. When the program is run, any one of the above-mentioned methods for adjusting the optical storage system is executed.

[0015] According to another aspect of the embodiments of the present invention, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, any one of the above-mentioned methods for adjusting the photovoltaic storage system is implemented.

[0016] In an embodiment of the present invention, an adjustment method for a photovoltaic storage system is adopted, by obtaining the output frequency and output voltage of the photovoltaic storage system; calculating the difference between the output frequency and a preset reference frequency to determine the frequency deviation; calculating the difference between the output voltage and a preset reference voltage to determine the voltage deviation; determining the active power droop coefficient according to the frequency deviation; determining the reactive power droop coefficient according to the voltage deviation; and changing the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system according to the active power droop coefficient and the reactive power droop coefficient to obtain the target output frequency and target output voltage of the photovoltaic storage system, thereby achieving the purpose of timely and accurate adjustment of the output frequency and output voltage of the photovoltaic storage system, thereby realizing the technical effect of improving the anti-disturbance capability of the photovoltaic storage system, and further solving the current technical problem of poor anti-disturbance capability of the photovoltaic storage system due to frequency and voltage changes of the microgrid caused by load disturbance or environmental disturbance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A hardware structure block diagram of a computer terminal for implementing an adjustment method of an optical storage system is shown;

[0019] Figure 2 is a flow chart of an adjustment method of a photovoltaic storage system provided in accordance with an embodiment of the present invention;

[0020] Figure 3 4 is a structural block diagram of an adjustment device for a photovoltaic storage system provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] According to an embodiment of the present invention, a method embodiment of a method for adjusting a photovoltaic storage system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0024] The method embodiment provided in the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1FIG. 1 shows a hardware structure block diagram of a computer terminal for implementing an adjustment method of an optical storage system. Figure 1 As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0025] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0026] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the adjustment method of the optical storage system in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the adjustment method of the optical storage system of the above-mentioned application program is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0027] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0028] Figure 2is a flow chart of an adjustment method of a photovoltaic storage system according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0029] Step S202, obtaining the output frequency and output voltage of the photovoltaic storage system.

[0030] In this step, the output frequency and output voltage of the photovoltaic storage system (i.e., photovoltaic power generation combined with energy storage system) can be monitored and controlled through its inverter. Because the output frequency and voltage are two basic parameters for measuring the stability and safety of the power system. The stability of frequency is crucial to ensure the synchronous operation of the power system, while the stability of voltage directly affects the normal operation of power equipment and the efficiency of power transmission. By real-time monitoring and control of these parameters, it can be ensured that the system remains in a safe and stable operating state during the interaction between the photovoltaic storage system and the power grid. In addition, in microgrids or distributed power generation systems, there is a direct coupling relationship between active power and frequency, and reactive power and voltage. By monitoring the output frequency, the active power output can be adjusted to respond to changes in the system frequency and realize a primary frequency modulation function. Similarly, monitoring the output voltage can help adjust the reactive power output to maintain the system voltage level and realize reactive power compensation and voltage support.

[0031] Step S204, calculating the difference between the output frequency and the preset reference frequency to determine the frequency deviation.

[0032] In this step, the difference between the output frequency of the photovoltaic storage system and the preset reference frequency is calculated to determine the frequency deviation, because the frequency deviation is an important indicator for monitoring the frequency stability in the power system. In a microgrid or distributed power generation system, the output frequency of the inverter needs to be consistent with the reference frequency set by the system to ensure the synchronous operation of various parts in the system. The calculation of the frequency deviation can help the controller understand the frequency state of the system in real time, so as to adjust the active power output to suppress frequency fluctuations and maintain the frequency stability within the allowable range. Among them, the reference frequency in the power system usually refers to the expected, standard or preset grid frequency, which is the set value of the target frequency when the power system is operating normally. All generators and inverters in the power system need to be synchronized with the reference frequency. This is because the power system is an interconnected network, and the devices in it must operate at the same frequency to ensure the smooth flow of power and the stability of the system. Synchronous operation also helps to avoid mutual interference between electrical equipment.

[0033] For example, when the power system encounters a sudden load change, the frequency will deviate from the set value. By calculating the frequency deviation, the controller can identify the frequency change and immediately adjust the active power output of the inverter to achieve the primary frequency modulation function, that is, quickly respond to system frequency changes, reduce frequency deviation, and enhance the frequency adaptability and stability of the system. In the microgrid, active power needs to be dynamically allocated according to the frequency deviation. When the frequency deviation is detected, the active power output can be adjusted according to its droop characteristics to share the load change and optimize power distribution. Therefore, calculating the difference between the inverter output frequency and the reference frequency, that is, the frequency deviation, is an important link in realizing frequency stability control, power optimization distribution, system protection, economic operation decision-making and status monitoring in the power system. It plays an important role in improving the overall performance and reliability of the power system.

[0034] Step S206, calculating the difference between the output voltage and the preset reference voltage to determine the voltage deviation.

[0035] In this step, the difference between the output voltage of the photovoltaic storage system and the preset reference voltage is calculated to determine the voltage deviation because the voltage deviation is a key indicator for measuring the voltage stability of the power system. In a distributed power generation system or microgrid, the inverter needs to adjust the output voltage according to the reference voltage set by the system to maintain voltage stability. By calculating the voltage deviation, the control system can understand the voltage state in real time and adjust the reactive power output when necessary to maintain the voltage within the allowable range to avoid the adverse effects of voltage fluctuations on power equipment and system performance. The voltage level of the power system is closely related to the supply of reactive power. When a voltage deviation is detected, the controller will increase or decrease the reactive power output of the inverter to compensate for the reactive demand in the power grid, thereby supporting the voltage and achieving stable voltage control. This dynamic compensation mechanism for reactive power can effectively reduce voltage fluctuations and enhance the stability and reliability of the power system, especially when the load changes suddenly or the grid conditions change. The reference voltage usually refers to the expected, standard or preset voltage level in the power system and electronic equipment. It is the voltage value used as a reference in system design and operation. The setting of the reference voltage is of great significance to ensure the stable operation of the power system, the normal operation of electrical equipment and the quality of power. In the power system, the reference voltage usually refers to the voltage level of the power grid during normal operation. For example, for a low-voltage distribution network, the reference voltage may be 230V or 110V (for AC power), while for a high-voltage transmission network, the reference voltage may be between several thousand volts and tens of thousands of volts, depending on the grid design or regional standards. The setting of the reference voltage needs to take into account multiple factors such as power system capacity, load demand, line length and impedance to ensure the efficiency and reliability of power transmission.

[0036] Step S208, determining the active power droop coefficient according to the frequency deviation;

[0037] In this step, the process of dynamically adjusting the active power droop coefficient according to the frequency deviation is a key mechanism for achieving frequency stability control of the power system, especially in microgrids or distributed energy systems. This process is mainly based on the principle of droop control, and its core is to simulate the frequency-active power response characteristics of traditional synchronous generators to achieve automatic distribution of active power and automatic correction of frequency deviation. For example, the calculated frequency deviation signal can be input into the control algorithm. The deviation signal reflects the difference between the current frequency state of the system and the set target, and is the basis for adjusting the active power droop coefficient. After receiving the frequency deviation signal, the control system will execute an adaptive droop coefficient calculation algorithm. This algorithm usually adjusts the active power droop coefficient according to the size and direction of the frequency deviation. For example, if the frequency deviation is large, the algorithm may increase the droop coefficient to prompt the system to adjust the active power faster and restore frequency stability; conversely, if the frequency deviation is small, the droop coefficient may be reduced to avoid unnecessary power adjustment and maintain the operating efficiency of the system. The calculation of the adaptive droop coefficient is usually based on a nonlinear functional relationship, such as an S-curve function, which makes the adjustment of the droop coefficient more flexible and intelligent, and can provide the most optimized frequency deviation suppression effect according to different situations.

[0038] Step S210: determining a reactive power droop coefficient according to the voltage deviation.

[0039] In this step, the process of dynamically adjusting the reactive power droop coefficient according to the voltage deviation is an important part of the power system control strategy, especially in microgrids and distributed generation systems, to maintain voltage stability and optimize power distribution. The voltage deviation calculated above will be fed into the control algorithm. The control algorithm may include filtering and signal processing steps to eliminate measurement noise and ensure the accuracy and stability of the deviation signal. Next, the control algorithm calculates an adaptive reactive power droop coefficient based on the size and direction of the voltage deviation. This coefficient is usually based on a preset functional relationship, such as an S-curve or other nonlinear function, which can adjust the sensitivity of reactive power droop control in real time according to the dynamic changes of the voltage deviation. For example, when the system detects a large voltage deviation, the adaptive algorithm may increase the droop coefficient to prompt the inverter to adjust the reactive power output more quickly, thereby suppressing voltage fluctuations more quickly; on the contrary, when the voltage deviation is small, the droop coefficient may be reduced to avoid unnecessary power adjustment and maintain the operating efficiency of the system.

[0040] Step S212, according to the active power droop coefficient and the reactive power droop coefficient, the output frequency and output voltage of the photovoltaic storage system are changed by adjusting the active power output and reactive power output of the photovoltaic storage system to obtain the target output frequency and target output voltage of the photovoltaic storage system.

[0041] In this step, the process of changing the output frequency and output voltage of the system by adjusting the active power output and reactive power output of the photovoltaic storage system according to the active power droop coefficient and the reactive power droop coefficient to achieve the target output frequency and target output voltage can be regarded as the specific implementation of the droop control strategy in the photovoltaic storage system. The inverter output in the photovoltaic storage system can be adjusted according to the active power droop coefficient and the reactive power droop coefficient to change the active power and reactive power output of the system. The adjustment of the inverter output power will directly affect the active power and reactive power distribution of the system, and then affect the frequency and voltage of the system. For active power, increasing the output will cause the frequency to rise, and reducing the output will cause the frequency to fall; for reactive power, increasing the output can compensate for the voltage drop, and reducing the output can cope with the voltage rise. The adjusted active power and reactive power output will be fed back to the system, affecting the frequency and voltage of the system. The system will continuously monitor the changes in frequency and voltage, and adjust the active power and reactive power output again according to the latest deviation value to form a closed-loop control. Through the above dynamic adjustment process, the system can adjust the output of the photovoltaic storage system according to the real-time frequency deviation and voltage deviation through adaptive active power droop coefficient and reactive power droop coefficient to achieve and maintain the target output frequency and target output voltage. This helps the system cope with load changes, grid disturbances or fluctuations in renewable energy output, and maintain the stability and efficiency of the power system.

[0042] Through the above steps, the purpose of timely and accurate adjustment of the output frequency and output voltage of the photovoltaic storage system is achieved, thereby realizing the technical effect of improving the anti-disturbance capability of the photovoltaic storage system, and further solving the current technical problem of poor anti-disturbance capability of the photovoltaic storage system caused by frequency and voltage changes of the microgrid due to load disturbances or environmental disturbances.

[0043] As an optional embodiment, the active power droop coefficient is determined according to the frequency deviation, including: obtaining an initial active power droop coefficient and an active power adaptive coefficient, wherein the active power adaptive coefficient characterizes the degree of influence of the frequency deviation on the active power droop coefficient; substituting the initial active power droop coefficient, the frequency deviation and the active power adaptive coefficient into a first preset formula to determine the active power droop coefficient.

[0044] Optionally, the process of obtaining the initial active power droop coefficient and combining it with the active power adaptive coefficient to dynamically determine the active power droop coefficient is an important step in achieving frequency stability control in microgrids and distributed power generation systems. The initial active power droop coefficient is usually set based on system design, grid standards or operating experience, and it reflects the relationship between the system active power output and frequency change in the absence of frequency deviation. The selection of the initial droop coefficient has a direct impact on the initial speed and stability of the system frequency response. The active power adaptive coefficient is used to characterize the degree of influence of the frequency deviation on the active power droop coefficient. This coefficient can be set according to system characteristics, load changes or control strategy objectives. The initial active power droop coefficient, frequency deviation and active power adaptive coefficient are brought into the first preset formula to calculate the dynamically adjusted active power droop coefficient (\(m\)). The first preset formula is usually a nonlinear function, such as an S-curve function, which describes the influence of frequency deviation on the droop coefficient.

[0045] Through this adaptive droop control strategy, the photovoltaic storage system or distributed generation system can respond to frequency changes more flexibly and intelligently, maintain the frequency stability of the power system, and improve the overall stability and efficiency of the system. This control mechanism is an important part of modern power system control technology, especially in dealing with the intermittent and volatile nature of renewable energy.

[0046] The first preset formula is as follows: f =mk f (erf(|Δf|)+1), where M f is the active power droop coefficient, m is the initial active power droop coefficient, k f is the active power adaptive coefficient, erf(|Δf|)+1) is the preset error function, and Δf is the frequency deviation.

[0047] As an optional embodiment, the reactive power droop coefficient is determined according to the voltage deviation, including: obtaining the initial reactive power droop coefficient and the reactive power adaptive coefficient, wherein the reactive power adaptive coefficient represents the influence of the voltage deviation on the reactive power droop coefficient; substituting the initial reactive power droop coefficient, the voltage deviation and the reactive power adaptive coefficient into a second preset formula to determine the reactive power droop coefficient.

[0048] Optionally, the process of determining the reactive power droop coefficient based on the voltage deviation is a key control step for maintaining voltage stability in microgrids and distributed generation systems. The initial reactive power droop coefficient is pre-set based on system design, grid standards or operating experience, and reflects the basic relationship between the reactive power output of the inverter and the voltage change in the absence of voltage deviation. The selection of this coefficient has a direct impact on the voltage response and stability of the system during normal operation. The reactive power adaptive coefficient is used to characterize the degree of influence of the voltage deviation on the reactive power droop coefficient. This coefficient can be set according to system characteristics, load changes or control strategy objectives, and sometimes it may be dynamically adjusted with voltage deviation or time changes. The initial reactive power droop coefficient, voltage deviation and reactive power adaptive coefficient are brought into the second preset formula to calculate the dynamically adjusted reactive power droop coefficient. The second preset formula is usually a nonlinear function, such as an S-curve function, which describes the influence of voltage deviation on the reactive power droop coefficient.

[0049] This adaptive reactive power droop control strategy enables the photovoltaic storage system or distributed power generation system to respond to voltage changes more flexibly and intelligently, maintain the voltage stability of the power system, and especially provide more accurate and timely voltage compensation when dealing with load changes or grid disturbances, thereby improving power quality.

[0050] The second preset formula is as follows: v =nk v (erf(|Δv|+1), where M v is the reactive power droop coefficient, n is the initial reactive power droop coefficient, ΔV is the voltage deviation, k v is the coefficient of the preset reactive power adaptive droop coefficient term, and erf(|ΔV|)+1) is the preset error function.

[0051] As an optional embodiment, according to the active power droop coefficient, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, including: according to the active power droop coefficient and a preset first adjustment formula, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, wherein the first adjustment formula is as follows: f = f n -M f (PP n ), where f is the output frequency, f n is the reference frequency, M f is the active power droop coefficient, P is the active power output of the solar energy storage system, and P n is the preset reference active power.

[0052] Optionally, the output of the active power of the photovoltaic storage system can be adjusted according to the first adjustment formula to change the output frequency of the photovoltaic storage system. The active power output of the photovoltaic storage system can be calculated using a preset first adjustment formula, and then the output of the inverter in the photovoltaic storage system is adjusted according to the calculated active power output to change the active power output of the system. This process usually includes adjusting the PWM (pulse width modulation) signal to control the magnitude and phase of the inverter output current, thereby achieving precise control of the active power. If the calculated active power output is higher than the reference active power, the active power output is increased; otherwise, the active power output is reduced. The adjusted active power output will affect the frequency of the system. The system will continue to monitor the frequency change and adjust the active power output again according to the latest frequency deviation to form a closed-loop control. If the frequency still deviates from the reference frequency, the control system will continue to adjust the active power output until the frequency deviation is suppressed to an acceptable range. Through the above closed-loop control process, the system can dynamically adjust the active power output according to the real-time frequency deviation, thereby changing the output frequency of the system and finally reaching the target output frequency. This process helps the system respond to load changes, grid disturbances or fluctuations in renewable energy output, maintain the frequency stability of the power system and improve overall system performance.

[0053] The droop control strategy suppresses frequency deviation by dynamically adjusting active power output, and is one of the key technologies to ensure frequency stability in power systems. Especially for photovoltaic storage systems, this strategy can achieve rapid response and stable control of frequency, enabling the system to better adapt to grid needs and provide stable, reliable and high-quality power services.

[0054] As an optional embodiment, according to the reactive power droop coefficient, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, including: according to the reactive power droop coefficient and a preset second adjustment formula, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, wherein the second adjustment formula is as follows: V = V n -M v Q, where M v is the reactive power droop coefficient, V is the output voltage, V n is the reference voltage, and Q is the reactive power output by the photovoltaic storage system.

[0055] Optionally, the output voltage of the photovoltaic storage system can be changed by adjusting the reactive power output of the photovoltaic storage system according to the reactive power droop coefficient and the preset second adjustment formula to obtain the target output voltage of the photovoltaic storage system. The output of the inverter in the photovoltaic storage system can be adjusted according to the reactive power output calculated by the second adjustment formula to change the reactive power output of the system. This process usually involves adjusting the control parameters of the inverter, such as changing the current phase of its output or by changing the parameters of the internal capacitor / reactor to increase or decrease the reactive power. The adjusted reactive power output will directly affect the system voltage. The system will continuously monitor the voltage changes and adjust the reactive power output again according to the latest voltage deviation to form a closed-loop control process. If the system detects that the voltage still deviates from the reference voltage, it will correct the deviation by further adjusting the reactive power output. Through the above closed-loop control process, the system can dynamically adjust the reactive power output according to the real-time voltage deviation, thereby changing the output voltage of the system and finally reaching the target output voltage. This mechanism helps the system cope with load fluctuations, grid disturbances or uncertainties in renewable energy generation and maintain the voltage within the desired stable range. The reactive power droop control strategy effectively suppresses voltage deviation by real-time monitoring and adaptively adjusting reactive power output, and is an important means to ensure the voltage stability of the power system and improve the quality of power. In the photovoltaic storage system, this strategy helps to achieve smooth interaction with the power grid, provide stable voltage support, and ensure the normal operation of the power system and efficient energy utilization.

[0056] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0057] Through the description of the above implementation methods, those skilled in the art can clearly understand that the adjustment method of the optical storage system according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0058] According to an embodiment of the present invention, there is also provided an adjustment device for a photovoltaic storage system for implementing the adjustment method for the photovoltaic storage system. Figure 3 is a structural block diagram of an adjustment device for an optical storage system provided according to an embodiment of the present invention, such as Figure 3 As shown, the adjustment device of the photovoltaic storage system includes: an acquisition module 302, a first calculation module 304, a second calculation module 306, a first determination module 308, a second determination module 310 and an adjustment module 312. The adjustment device of the photovoltaic storage system is described below.

[0059] The acquisition module 302 is used to acquire the output frequency and output voltage of the photovoltaic storage system.

[0060] The first calculation module 304 is connected to the acquisition module 302 and is used to calculate the difference between the output frequency and the preset reference frequency to determine the frequency deviation.

[0061] The second calculation module 306 is connected to the acquisition module 302 and is used to calculate the difference between the output voltage and a preset reference voltage to determine the voltage deviation.

[0062] The first determination module 308 is connected to the first calculation module 304, and is used to determine the active power droop coefficient according to the frequency deviation.

[0063] The second determination module 310 is connected to the second calculation module 306 and is used to determine the reactive power droop coefficient according to the voltage deviation.

[0064] The adjustment module 312 is connected to the first determination module 308 and the second determination module 310, and is used to change the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system according to the active power droop coefficient and the reactive power droop coefficient, so as to obtain the target output frequency and target output voltage of the photovoltaic storage system.

[0065] It should be noted that the acquisition module 302, the first calculation module 304, the second calculation module 306, the first determination module 308, the second determination module 310 and the adjustment module 312 correspond to steps S202 to S212 in the embodiment, and the examples and application scenarios implemented by the multiple modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run in the computer terminal 10 provided in the embodiment.

[0066] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one network device among multiple network devices of a computer network. The computer device includes a memory and a processor.

[0067] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the adjustment method and device of the optical storage system in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, realizing the adjustment method of the optical storage system mentioned above. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0068] The processor can call the information and application programs stored in the memory through the transmission device to perform the following steps: obtain the output frequency and output voltage of the photovoltaic storage system; calculate the difference between the output frequency and a preset reference frequency to determine the frequency deviation; calculate the difference between the output voltage and a preset reference voltage to determine the voltage deviation; determine the active power droop coefficient based on the frequency deviation; determine the reactive power droop coefficient based on the voltage deviation; based on the active power droop coefficient and the reactive power droop coefficient, change the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system to obtain the target output frequency and target output voltage of the photovoltaic storage system.

[0069] Optionally, the processor may also execute the program code of the following steps: determining the active power droop coefficient according to the frequency deviation, including: obtaining the initial active power droop coefficient and the active power adaptive coefficient, wherein the active power adaptive coefficient characterizes the degree of influence of the frequency deviation on the active power droop coefficient; substituting the initial active power droop coefficient, the frequency deviation and the active power adaptive coefficient into the first preset formula to determine the active power droop coefficient.

[0070] Optionally, the processor may further execute the following program code: The first preset formula is as follows: M f =mk f (erf(|Δf|)+1), where M f is the active power droop coefficient, m is the initial active power droop coefficient, k f is the active power adaptive coefficient, erf(|Δf|)+1) is the preset error function, and Δf is the frequency deviation.

[0071] Optionally, the processor may also execute the program code of the following steps: determining the reactive power droop coefficient according to the voltage deviation, including: obtaining the initial reactive power droop coefficient and the reactive power adaptive coefficient, wherein the reactive power adaptive coefficient represents the degree of influence of the voltage deviation on the reactive power droop coefficient; substituting the initial reactive power droop coefficient, the voltage deviation and the reactive power adaptive coefficient into the second preset formula to determine the reactive power droop coefficient.

[0072] Optionally, the processor may further execute the following program code: The second preset formula is as follows: v =nk v (erf(|Δv|+1), where M v is the reactive power droop coefficient, n is the initial reactive power droop coefficient, ΔV is the voltage deviation, k v is the coefficient of the preset reactive power adaptive droop coefficient term, and erf(|ΔV|)+1) is the preset error function.

[0073] Optionally, the processor may also execute the following program code: according to the active power droop coefficient, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, including: according to the active power droop coefficient and a preset first adjustment formula, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, wherein the first adjustment formula is as follows: f=f n -M f (PP n ), where f is the output frequency, f n is the reference frequency, M f is the active power droop coefficient, P is the active power output of the solar energy storage system, and P n is the preset reference active power.

[0074] Optionally, the processor may further execute the following program code: according to the reactive power droop coefficient, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, including: according to the reactive power droop coefficient and a preset second adjustment formula, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, wherein the second adjustment formula is as follows: V = V n -M v Q, where M v is the reactive power droop coefficient, V is the output voltage, V n is the reference voltage, and Q is the reactive power output by the photovoltaic storage system.

[0075] By adopting the embodiment of the present invention, a method for adjusting a photovoltaic storage system is provided, which obtains the output frequency and output voltage of the photovoltaic storage system; calculates the difference between the output frequency and a preset reference frequency to determine the frequency deviation; calculates the difference between the output voltage and a preset reference voltage to determine the voltage deviation; determines the active power droop coefficient according to the frequency deviation; determines the reactive power droop coefficient according to the voltage deviation; and changes the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system according to the active power droop coefficient and the reactive power droop coefficient, thereby obtaining the target output frequency and target output voltage of the photovoltaic storage system, thereby achieving the purpose of timely and accurately adjusting the output frequency and output voltage of the photovoltaic storage system, thereby realizing the technical effect of improving the anti-disturbance capability of the photovoltaic storage system, and further solving the current technical problem of poor anti-disturbance capability of the photovoltaic storage system due to frequency and voltage changes of the microgrid caused by load disturbance or environmental disturbance.

[0076] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0077] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the adjustment method of the optical storage system provided in the embodiment.

[0078] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0079] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: obtaining the output frequency and output voltage of the photovoltaic storage system; calculating the difference between the output frequency and a preset reference frequency to determine the frequency deviation; calculating the difference between the output voltage and a preset reference voltage to determine the voltage deviation; determining an active power droop coefficient based on the frequency deviation; determining a reactive power droop coefficient based on the voltage deviation; and changing the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system based on the active power droop coefficient and the reactive power droop coefficient to obtain a target output frequency and target output voltage of the photovoltaic storage system.

[0080] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: determining an active power droop coefficient based on a frequency deviation, including: obtaining an initial active power droop coefficient and an active power adaptive coefficient, wherein the active power adaptive coefficient characterizes the degree of influence of the frequency deviation on the active power droop coefficient; substituting the initial active power droop coefficient, the frequency deviation and the active power adaptive coefficient into a first preset formula to determine the active power droop coefficient.

[0081] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: The first preset formula is as follows: f =mk f (erf(|Δf|)+1), where M f is the active power droop coefficient, m is the initial active power droop coefficient, k f is the active power adaptive coefficient, erf(|Δf|)+1) is the preset error function, and Δf is the frequency deviation.

[0082] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: determining the reactive power droop coefficient based on the voltage deviation, including: obtaining an initial reactive power droop coefficient and a reactive power adaptive coefficient, wherein the reactive power adaptive coefficient characterizes the degree of influence of the voltage deviation on the reactive power droop coefficient; substituting the initial reactive power droop coefficient, the voltage deviation and the reactive power adaptive coefficient into a second preset formula to determine the reactive power droop coefficient.

[0083] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: The second preset formula is as follows: v =nk v (erf(|Δv|+1), where M v is the reactive power droop coefficient, n is the initial reactive power droop coefficient, ΔV is the voltage deviation, k v is the coefficient of the preset reactive power adaptive droop coefficient term, and erf(|ΔV|)+1) is the preset error function.

[0084] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: according to the active power droop coefficient, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, including: according to the active power droop coefficient and a preset first adjustment formula, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, wherein the first adjustment formula is as follows: f=f n -Mf (PP n ), where f is the output frequency, f n is the reference frequency, M f is the active power droop coefficient, P is the active power output of the solar energy storage system, and P n is the preset reference active power.

[0085] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: according to the reactive power droop coefficient, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, including: according to the reactive power droop coefficient and a preset second adjustment formula, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, wherein the second adjustment formula is as follows: V = V n -M v Q, where M v is the reactive power droop coefficient, V is the output voltage, V n is the reference voltage, and Q is the reactive power output by the photovoltaic storage system.

[0086] An embodiment of the present invention also provides a computer program product, including a computer program. Optionally, in this embodiment, when the computer program is executed by a processor, it can achieve: obtaining the output frequency and output voltage of the photovoltaic storage system; calculating the difference between the output frequency and a preset reference frequency to determine the frequency deviation; calculating the difference between the output voltage and a preset reference voltage to determine the voltage deviation; determining the active power droop coefficient based on the frequency deviation; determining the reactive power droop coefficient based on the voltage deviation; and changing the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system based on the active power droop coefficient and the reactive power droop coefficient to obtain the target output frequency and target output voltage of the photovoltaic storage system.

[0087] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0088] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0089] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0090] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0091] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0092] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0093] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for adjusting a photovoltaic storage system, characterized in that: include: Obtain the output frequency and output voltage of the photovoltaic storage system; Calculating the difference between the output frequency and a preset reference frequency to determine a frequency deviation; Calculating the difference between the output voltage and a preset reference voltage to determine a voltage deviation; Determining an active power droop coefficient according to the frequency deviation; Determining a reactive power droop coefficient according to the voltage deviation; According to the active power droop coefficient and the reactive power droop coefficient, the output frequency and output voltage of the photovoltaic storage system are changed by adjusting the active power output and reactive power output of the photovoltaic storage system to obtain the target output frequency and target output voltage of the photovoltaic storage system.

2. The method according to claim 1, characterized in that Determining the active power droop coefficient according to the frequency deviation includes: Acquire an initial active power droop coefficient and an active power adaptive coefficient, wherein the active power adaptive coefficient represents the influence of the frequency deviation on the active power droop coefficient; The initial active power droop coefficient, the frequency deviation and the active power adaptive coefficient are substituted into a first preset formula to determine the active power droop coefficient.

3. The method according to claim 2, characterized in that The first preset formula is as follows: M f =m-k f (erf(|Δf|)+1) Among them, M f is the active power droop coefficient, m is the initial active power droop coefficient, k f is the active power adaptive coefficient, erf(|Δf|)+1) is a preset error function, and Δf is the frequency deviation.

4. The method according to claim 1, characterized in that: Determining the reactive power droop coefficient according to the voltage deviation includes: Obtaining an initial reactive power droop coefficient and a reactive power adaptive coefficient, wherein the reactive power adaptive coefficient represents the influence of the voltage deviation on the reactive power droop coefficient; The initial reactive power droop coefficient, the voltage deviation and the reactive power adaptive coefficient are substituted into a second preset formula to determine the reactive power droop coefficient.

5. The method according to claim 4, characterized in that The second preset formula is as follows: M v =nk v (inherit(|Δv|+1) Among them, M v is the reactive power droop coefficient, n is the initial reactive power droop coefficient, ΔV is the voltage deviation, k v is the coefficient of the preset reactive power adaptive droop coefficient term, and erf(|ΔV|)+1) is the preset error function.

6. The method according to claim 1, characterized in that According to the active power droop coefficient, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, including: According to the active power droop coefficient and the preset first adjustment formula, the output frequency of the photovoltaic storage system is changed by adjusting the active power output of the photovoltaic storage system to obtain the target output frequency of the photovoltaic storage system, wherein the first adjustment formula is as follows: f=f n -M f (P-P n ) Where, f is the output frequency, f n is the reference frequency, M f is the active power droop coefficient, P is the active power output by the solar energy storage system, and P n is the preset reference active power.

7. The method according to claim 1, characterized in that According to the reactive power droop coefficient, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain a target output voltage of the photovoltaic storage system, including: According to the reactive power droop coefficient and the preset second adjustment formula, the output voltage of the photovoltaic storage system is changed by adjusting the reactive power output of the photovoltaic storage system to obtain the target output voltage of the photovoltaic storage system, wherein the second adjustment formula is as follows: V=V n -M v Q Among them, M v is the reactive power droop coefficient, V is the output voltage, V n is the reference voltage, and Q is the reactive power output by the photovoltaic storage system.

8. An adjustment device for a photovoltaic storage system, characterized in that: include: An acquisition module, used to acquire the output frequency and output voltage of the photovoltaic storage system; A first calculation module, used for calculating the difference between the output frequency and a preset reference frequency to determine a frequency deviation; A second calculation module, used for calculating the difference between the output voltage and a preset reference voltage to determine a voltage deviation; A first determining module, used to determine an active power droop coefficient according to the frequency deviation; A second determination module, used to determine a reactive power droop coefficient according to the voltage deviation; An adjustment module is used to change the output frequency and output voltage of the photovoltaic storage system by adjusting the active power output and reactive power output of the photovoltaic storage system according to the active power droop coefficient and the reactive power droop coefficient, so as to obtain the target output frequency and target output voltage of the photovoltaic storage system.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the adjustment method of the optical storage system according to any one of claims 1 to 7.

10. A computer device, characterized in that: include: Memory and processor, The memory stores a computer program; The processor is used to execute the computer program stored in the memory, and when the computer program is running, the processor executes the adjustment method of the photovoltaic storage system according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the adjustment method of the photovoltaic storage system described in any one of claims 1 to 7 is implemented.

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