Distributed secondary frequency control method and device, medium and equipment

Abstract

The invention discloses a distributed secondary frequency control method and device, a medium and equipment, and relates to the technical field of computers. Different parameter setting strategies are formulated according to different load active power change conditions, frequency recovery can be realized and power sharing realized by one-time control can be maintained by simultaneously adjusting the active power reference value and the droop coefficient of each distributed power supply, and meanwhile, the slope of a droop curve is changed by adjusting the droop coefficient, so that power sharing can be realized by one-time control. The frequency corresponding to the range from the active power 0 to the rated capacity in the adjusted droop curve falls into the frequency range of stable operation of the distributed power supply, the active power output range of each distributed power supply is maintained, and the adjustment margin of each distributed power supply is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of computer technology, and in particular to a distributed secondary frequency control method, apparatus, medium, and device. Background Technology

[0002] Currently, distributed generation (DG) is developing rapidly worldwide. In new power systems, especially in islanded microgrids, distributed generation sources undertake the entire power supply task. Frequency control in islanded microgrids typically adopts a hierarchical control structure, including primary control, secondary control, and tertiary control. Primary frequency control is usually achieved through droop control, which simulates the active power-frequency characteristics of synchronous generators to achieve power sharing and frequency stability. The droop control structure is simple and has been widely used in engineering practice with good results. In contrast, secondary frequency control is much more complex. Existing distributed secondary frequency control methods can be roughly divided into four categories: distributed secondary frequency control based on proportional-integral control, distributed secondary frequency control based on small AC signal injection, distributed secondary frequency control based on state estimation, and improved mode-switching distributed secondary frequency control.

[0003] In existing technologies, distributed quadratic frequency control based on proportional-integral control is used in droop control functions. The measurement frequency was increased based on the existing measurement frequency. With rated frequency The ratio of the deviation between the two terms is the integral term, thereby achieving frequency recovery. In the formula, This is a reference value for active power. The output active power, This is the droop coefficient. However, in the distributed secondary frequency control method based on proportional-integral control, the active power sharing achieved by the primary control is disrupted due to the inconsistency of the integrator's initial conditions and the accumulation of disturbances.

[0004] The distributed secondary frequency control method based on small AC signal injection and the distributed secondary frequency control method based on state estimation introduce additional mechanisms on the basis of the distributed secondary frequency control method based on proportional-integral control, solving the problem that secondary control will disrupt active power sharing. The improved mode-switching distributed secondary frequency control method simplifies secondary frequency control to some extent, directly adjusting the active power reference value of each distributed power source to equal the current output active power to achieve frequency recovery.

[0005] However, whether it is the distributed secondary frequency control method based on proportional-integral control that adjusts the active power reference value of each distributed power source to equal the current output active power by adding an additional integral term, or the improved distributed secondary frequency control method with mode switching that directly adjusts the active power reference value of each distributed power source to equal the current output active power, the existing methods only adjust the active power reference value of each distributed power source. The resulting change in the droop curve will reduce the power output range of each distributed power source and decrease the adjustment margin. Summary of the Invention

[0006] Therefore, it is necessary to provide a distributed secondary frequency control method, apparatus, medium, and equipment to address the aforementioned technical problems.

[0007] The present invention adopts the following technical solution: This invention provides a distributed secondary frequency control method. First, the current measurement frequency of each distributed power source is obtained. Then, for each distributed power source, when the measurement frequency deviates from the rated frequency, the active power reference value of the distributed power source is adjusted to equal its current output active power, and it is determined whether its current output active power is greater than half of the rated capacity. If so, the updated droop coefficient corresponding to the distributed power source is determined and adjusted according to the upper limit of the stable operating frequency range of the distributed power source, so that the frequency corresponding to 0 active power in the adjusted droop curve falls into the stable operating frequency range of the distributed power source. If not, the updated droop coefficient corresponding to the distributed power source is determined and adjusted according to the lower limit of the stable operating frequency range of the distributed power source, so that the frequency corresponding to 0 active power in the adjusted droop curve falls into the stable operating frequency range of the distributed power source.

[0008] This invention provides a distributed secondary frequency control device, comprising: The acquisition module is used to acquire the current measurement frequency of each distributed power source; The adjustment module is used to adjust the active power reference value of each distributed power source to equal its current output active power when the measured frequency of the distributed power source deviates from the rated frequency. It then determines whether the current output active power is greater than half of the rated capacity. If so, it determines and adjusts the updated droop coefficient corresponding to the distributed power source based on the upper limit of the stable operating frequency range of the distributed power source, so that the frequency corresponding to 0 active power in the adjusted droop curve falls within the stable operating frequency range of the distributed power source. If not, it determines and adjusts the updated droop coefficient corresponding to the distributed power source based on the lower limit of the stable operating frequency range of the distributed power source, so that the frequency corresponding to 0 active power in the adjusted droop curve falls within the stable operating frequency range of the distributed power source.

[0009] The present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described distributed secondary frequency control method.

[0010] The present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-described distributed secondary frequency control method when executing the program.

[0011] The above-mentioned at least one technical solution adopted in this invention can achieve the following beneficial effects: This invention proposes different parameter tuning strategies for different load active power variations. By simultaneously adjusting the active power reference value and droop coefficient of each distributed power source, frequency recovery can be achieved while maintaining the power sharing achieved by the first control. At the same time, by adjusting the droop coefficient to change the slope of the droop curve, the frequency corresponding to the active power from 0 to the rated capacity in the adjusted droop curve falls within the frequency range of stable operation of the distributed power source, thus maintaining the active power output range of each distributed power source and ensuring the adjustment margin of each distributed power source. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic flowchart of a distributed secondary frequency control method provided by the present invention; Figure 2 This invention provides a schematic diagram of an upward translation of a drooping curve. Figure 3 This invention provides a schematic diagram of a downward translation of a drooping curve; Figure 4 A schematic diagram of the adjustment strategy for a distributed secondary frequency control method with multi-parameter adjustment provided by the present invention when the power consumed by the load is greater than half of the rated capacity. Figure 5 A schematic diagram of the adjustment strategy for a distributed secondary frequency control method with multi-parameter adjustment provided by the present invention when the power consumed by the load is less than half of the rated capacity. Figure 6 A schematic diagram illustrating a method for continuously triggering the present invention; Figure 7 A schematic diagram of a distributed secondary frequency control method with multi-parameter adjustment provided by the present invention; Figure 8 This is a schematic diagram of a distributed secondary frequency control device provided by the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0014] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of a distributed secondary frequency control method according to the present invention, which specifically includes the following steps: S101: Obtain the current measurement frequency of each distributed power source.

[0016] S102: For each distributed power source, when the measurement frequency of the distributed power source deviates from the rated frequency, adjust the active power reference value of the distributed power source to be equal to its current output active power, and determine whether its current output active power is greater than half of the rated capacity; if yes, then execute step S103, if no, then execute step S104.

[0017] S103: Based on the upper limit of the frequency range in which the distributed power source operates stably, determine the updated droop coefficient corresponding to the distributed power source and adjust it so that the frequency corresponding to the active power of 0 in the adjusted droop curve falls into the frequency range in which the distributed power source operates stably.

[0018] S104: Based on the lower bound of the frequency range in which the distributed power source operates stably, determine and adjust the updated droop coefficient corresponding to the distributed power source so that the frequency corresponding to the active power at the rated capacity in the adjusted droop curve falls within the frequency range in which the distributed power source operates stably.

[0019] Currently, distributed quadratic frequency control based on proportional-integral control is used in droop control functions. The measurement frequency was increased based on the existing measurement frequency. With rated frequency The ratio of the deviation between the two terms is the integral term, thereby achieving frequency recovery. In the formula, This is a reference value for active power. The output active power, The droop coefficient is given. The control function for this control method is: In the formula, The droop coefficient is... and These are the proportional coefficient and the integral coefficient, respectively. It is a complex frequency variable.

[0020] The distributed secondary frequency control methods based on small AC signal injection and state estimation introduce additional mechanisms on top of the proportional-integral control-based distributed secondary frequency control method, solving the problem that secondary control disrupts active power sharing. The improved mode-switching distributed secondary frequency control method simplifies secondary frequency control to some extent, but existing methods only adjust the active power reference values ​​of each distributed power source. P ref From the droop control function As can be seen from this, when each distributed power source... P ref equal P act At that time, there exists ω equal ω nom Therefore, existing methods only adjust the active power reference value. P ref This is sufficient to achieve frequency recovery.

[0021] And droop control function The expression for the intercept is ω nom + m p * P ref Therefore, existing methods are... P ref Adjustments will inevitably cause changes in the intercept. Visually, this will result in a vertical shift in the sag curve, such as... Figure 2 and Figure 3 As shown, Figure 2 This is a schematic diagram of an upward translation of a drooping curve in this invention. Figure 3 This is a schematic diagram of a downward translation of a drooping curve in this invention.

[0022] In the drooping curve In the initial setting, it is usually set P act When equal to 0, the corresponding ω This is the upper limit of the frequency range in which distributed power sources can operate stably. ω max , P act Equal to rated capacity C i Time corresponding ω The lower limit of the frequency range in which distributed power sources can operate stably. ω min The initial active power output range is [0, Ci The initial droop curve is set as follows: F 1. When the frequency deviates from the rated value, the existing distributed secondary frequency control method is used to achieve frequency recovery and active power sharing. The droop control function is from... F 1. Translate to F 1 ' .like F 1. Move upwards to F 1 ' ,See Figure 2 This shows the upper limit of the frequency range in which distributed power sources can operate stably. ω max corresponding P act The value is P min ' ,when P act Less than P min ' Time corresponding ω It will be greater than ω max This is not allowed. Therefore, the output range is [0, ... C i Compared to the previous method, the output range is reduced to [ ]. P min ' , C i The regulation margin of distributed power sources decreases.

[0023] Similarly, if F 1. Move down to F 1 ' ,See Figure 3 This shows the lower limit of the frequency range in which distributed power sources can operate stably. ω min corresponding P act The value is P max ' ,when P act Greater than P max ' Time corresponding ω It will be smaller than ω min This is also not allowed. Therefore, the output range is [0, C i Compared to the previous method, the output range is reduced to [0, Pmax ' The regulation margin of distributed power sources will also decrease.

[0024] Therefore, in any case, using existing methods will reduce the output range and regulation margin of distributed power sources.

[0025] Based on this, the present invention proposes to simultaneously regulate distributed power sources. i droop coefficient m p_i and active power reference value P ref_i These two parameters, while achieving frequency recovery and active power sharing, maintain the regulation margin of distributed power sources.

[0026] In one or more embodiments of the present invention, the server may first obtain the current measurement frequency of each distributed power source to determine whether each distributed generator has experienced frequency deviation and needs adjustment based on the rated frequency. Furthermore, to filter out minor disturbances, in one or more embodiments of the present invention, the server may also obtain the current measurement frequency and frequency change rate of each distributed power source; thereby, for each distributed power source, it is determined whether the measurement frequency of the distributed power source deviates from the rated frequency and whether the frequency change rate remains within a preset range for a preset time period. If so, it is determined whether each distributed generator has experienced frequency deviation and needs adjustment, that is, adjusting the active power reference value of each distributed power source to equal its current output active power, and determining whether its current output active power is greater than half of its rated capacity.

[0027] This invention's distributed secondary frequency control method handles two scenarios: active power greater than half of the rated capacity and active power less than half of the rated capacity. The droop coefficient is adjusted in both scenarios. m p_i The regulatory strategies differ.

[0028] In one or more embodiments of the present invention, for cases where the active power is greater than half of the rated capacity, the update droop coefficient corresponding to the distributed power source can be determined by the following formula based on the upper limit of the frequency range in which the distributed power source operates stably: .

[0029] In the formula, For distributed power sources i The corresponding updated droop coefficient, For distributed power sources i Current output active power, For distributed power sources i The upper limit of the frequency range for stable operation. For distributed power sources i The rated frequency.

[0030] Furthermore, in one or more embodiments of the present invention, for cases where the active power is less than half of the rated capacity, the update droop coefficient corresponding to the distributed power source can be determined by the following formula based on the lower bound of the frequency range in which the distributed power source operates stably: .

[0031] In the formula, For distributed power sources i Rated active power capacity, For distributed power sources i The lower limit of the frequency range for stable operation.

[0032] For example, Figure 4 This diagram illustrates the adjustment strategy of a distributed secondary frequency control method with multi-parameter adjustment in this invention when the power consumed by the load exceeds half of the rated capacity. Taking two distributed power sources as an example, their capacity ratio is 1:2. The initial droop control functions of the two distributed power sources are expressed as follows: F 1 and F 2. Initial operating points are O1 and O2, at which point the measurement frequency of the two distributed power sources is equal to the rated frequency. When the active power demand increases, a control operation is first executed, and the operating points of the two distributed power sources are moved from O1 and O2 to new operating points A1 and A2 respectively, with corresponding active power values ​​of... P A_1 and P A_2 This maintains a 1:2 power sharing ratio, while the frequencies of the two distributed power sources deviate from their rated values. If the load power does not change with frequency, a new droop curve is needed to restore the frequency to its rated value. F 1 ' It needs to go through O1 ' ( P A_1 , ω nom ), F 2 ' It needs to pass through O2 ' ( P A_2 , ω nom Only the DGs need to be adjusted. P ref_i Equal to this time P act_i The value (defined as) P A_i This can be achieved.

[0033] In addition, in order to ω All are within the frequency range where the system can operate stably. ω min , ω max Within [the specified area], set the intercept of the new sag curve. ω nom + m p_i ' * P ref_i ' Equal to the intercept of the initial droop curve (the droop curve before frequency adjustment) ω nom + m p_i * P ref_i ,in P ref_i ' For the regulated distributed power source i The active power reference value, m p_i ' The updated droop coefficient corresponding to the new droop curve is calculated using the following formula: Among them, Δ y Indicates the initial sag curve intercept. ω nom + m p_i * P ref_i and ω nom The difference between them, Δ of all distributed power sources y same.

[0034] For example, Figure 5 This diagram illustrates the adjustment strategy of a distributed secondary frequency control method with multi-parameter adjustment in this invention when the power consumed by the load is less than half of the rated capacity. Taking two distributed power sources as an example, when the active power demand decreases, the operating points of the two distributed power sources become A1 and A2 after primary control, corresponding to active power of... P A_1 and P A_2 Similarly, if the load power does not change with frequency, a new droop curve is needed to restore the frequency to its rated value. F 1 ' After O1 ' ( P A_1 , ω nom ), F 2 ' After O2 ' ( P A_2 , ωnom This is achieved by adjusting the power of each distributed power source. P ref_i equal P A_i This can be achieved. In this case, if only the slope of the droop curve is adjusted while the intercept remains unchanged, it can be observed that the frequency corresponding to the lower limit... ω min The active power will be less than the rated capacity. C i Therefore, when the load power subsequently increases, the new droop curve may cause the frequency to exceed the allowable range. Therefore, this invention proposes to adjust both the slope and the intercept simultaneously. The new droop curve is set after (… P A_i , ω nom )and( C i , ω min These two points allow us to obtain the updated droop coefficient. m p_i ' The calculation formula is: .

[0035] Figure 4 and Figure 5 All of these adjustments are based on the assumption that the power consumed by the load does not change with frequency. However, if the load includes a motor, the power consumed by the load will change with frequency. Therefore, after applying the above adjustment strategy once, the frequency may not have recovered to its rated value. The above adjustment strategy can then be applied continuously. Since each application of the above adjustment strategy brings the frequency closer to the rated frequency, frequency recovery can eventually be achieved. Figure 6 As shown, Figure 6 This is a schematic diagram of a method for continuously triggering the present invention. This diagram can be considered as... Figure 4 An extension of the single DG case. Even when the frequency deviates from the rated value, it still uses... Figure 4 If the adjustment strategy in the middle is used to set a new droop control function, then the droop curve will be changed from... F 1 becomes F 1 ' Because the frequency is determined by ω A Increase to ω A ' The active power consumed by the load also increases accordingly, thus the operating point deviates from O1. ' Arrived at A1 ' Based on this, it was adopted again. Figure 4 The adjustment strategy in the middle is used to set a new droop control function, further adjusting the droop curve from F 1' Adjust to F 1 '' Through such continuous adjustments, the system frequency will gradually approach the rated frequency. ω nom .

[0036] Figure 7 This is a schematic diagram of a distributed secondary frequency control method with multi-parameter adjustment according to the present invention. Each distributed power source locally calculates its output active power. P act ,frequency ω By rated frequency ω nom minus m p and( P act - P ref The product of these factors is used to obtain the primary frequency control. The primary voltage control process is similar. Subsequently, dual-loop control of voltage and current is introduced to enhance the system's dynamic response and stability. Secondary control is independent of primary control and only activates when the triggering condition of frequency stability and deviation from the rated value is met. Secondary control is based on... Figure 4 or Figure 5 Adjustment strategy update m p_i and P ref_i The value is used to restore the frequency of the distributed power source.

[0037] based on Figure 1 The distributed secondary frequency control method shown in this invention has formulated different parameter tuning strategies for different load active power changes. By simultaneously adjusting the active power reference value and droop coefficient of each distributed power source, frequency recovery can be achieved while maintaining the power sharing achieved by the primary control. At the same time, by adjusting the droop coefficient to change the slope of the droop curve, the frequency corresponding to the active power from 0 to the rated capacity in the adjusted droop curve falls within the frequency range of stable operation of the distributed power source, maintaining the active power output range of each distributed power source and ensuring the adjustment margin of each distributed power source.

[0038] When applying the distributed secondary frequency control method provided by this invention, it is not necessary to... Figure 1 The steps shown are executed in sequence. The specific execution order of each step can be determined as needed, and this invention does not impose any restrictions on it.

[0039] The above describes a distributed secondary frequency control method provided by one or more embodiments of the present invention. Based on the same idea, the present invention also provides a corresponding distributed secondary frequency control device, such as... Figure 8 As shown.

[0040] Figure 8 A schematic diagram of a distributed secondary frequency control device provided by the present invention includes: The acquisition module 201 is used to acquire the current measurement frequency of each distributed power source; The adjustment module 202 is used to adjust the active power reference value of each distributed power source to equal its current output active power when the measurement frequency of the distributed power source deviates from the rated frequency, and to determine whether its current output active power is greater than half of the rated capacity. If so, it determines the updated droop coefficient corresponding to the distributed power source based on the upper limit of the stable operating frequency range of the distributed power source and adjusts it so that the frequency corresponding to 0 active power in the adjusted droop curve falls into the stable operating frequency range of the distributed power source. If not, it determines the updated droop coefficient corresponding to the distributed power source based on the lower limit of the stable operating frequency range of the distributed power source and adjusts it so that the frequency corresponding to 0 active power in the adjusted droop curve falls into the stable operating frequency range of the distributed power source.

[0041] Specific limitations regarding the distributed secondary frequency control device can be found in the limitations of the distributed secondary frequency control method described above, and will not be repeated here. Each module in the aforementioned distributed secondary frequency control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0042] The present invention also provides a computer-readable storage medium storing a computer program that can be used to execute the above-described... Figure 1 The provided distributed secondary frequency control method.

[0043] This invention also provides a computer device. At the hardware level, the computer device includes a processor, an internal bus, a network interface, memory, and non-volatile memory, and may also include other hardware required for various operations. The processor reads the corresponding computer program from the non-volatile memory into memory and then executes it to achieve the above-mentioned functions. Figure 1 The provided distributed secondary frequency control method.

[0044] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this invention.

Claims

1. A distributed secondary frequency control method, characterized in that, include: Obtain the current measurement frequency of each distributed power source; For each distributed power source, when the measurement frequency of the distributed power source deviates from the rated frequency, the active power reference value of the distributed power source is adjusted to be equal to its current output active power, and it is determined whether its current output active power is greater than half of the rated capacity. If so, then based on the upper limit of the frequency range in which the distributed power source operates stably, determine the updated droop coefficient corresponding to the distributed power source and adjust it so that the frequency corresponding to the active power of 0 in the adjusted droop curve falls into the frequency range in which the distributed power source operates stably. If not, then based on the lower bound of the frequency range in which the distributed power source operates stably, determine the updated droop coefficient corresponding to the distributed power source and adjust it so that the frequency corresponding to the active power at the rated capacity in the adjusted droop curve falls within the frequency range in which the distributed power source operates stably.

2. The method as described in claim 1, characterized in that, The step of determining the droop coefficient corresponding to the distributed power source based on the upper bound of the frequency range in which the distributed power source operates stably includes: Based on the upper bound of the frequency range in which the distributed power source operates stably, the update droop coefficient corresponding to the distributed power source is determined by the following formula: ； in, For distributed power sources i The corresponding updated droop coefficient, For distributed power sources i Current output active power, For distributed power sources i The upper limit of the frequency range for stable operation. For distributed power sources i The rated frequency.

3. The method as described in claim 1, characterized in that, The step of determining the droop coefficient corresponding to the distributed power source based on the lower bound of the frequency range in which the distributed power source operates stably includes: Based on the lower bound of the frequency range in which the distributed power source operates stably, the update droop coefficient corresponding to the distributed power source is determined by the following formula: ； in, For distributed power sources i The corresponding updated droop coefficient, For distributed power sources i Rated active power capacity, For distributed power sources i Current output active power, For distributed power sources i The rated frequency, For distributed power sources i The lower limit of the frequency range for stable operation.

4. The method as described in claim 1, characterized in that, The acquisition of the current measurement frequency of each distributed power source specifically includes: Obtain the current measurement frequency and frequency change rate of each distributed power source; When the measurement frequency of the distributed power source deviates from the rated frequency, the active power reference value of each distributed power source is adjusted to equal its current output active power, and it is determined whether its current output active power is greater than half of the rated capacity. Specifically, this includes: When the measurement frequency of the distributed power source deviates from the rated frequency and the rate of frequency change remains within a preset range for a preset time period, the active power reference value of each distributed power source is adjusted to equal its current output active power, and it is determined whether its current output active power is greater than half of the rated capacity.

5. A distributed secondary frequency control device, characterized in that, include: The acquisition module is used to acquire the current measurement frequency of each distributed power source; The adjustment module is used to adjust the active power reference value of each distributed power source to equal its current output active power when the measurement frequency of the distributed power source deviates from the rated frequency, and to determine whether its current output active power is greater than half of the rated capacity. If yes, then based on the upper limit of the frequency range in which the distributed power source operates stably, determine the updated droop coefficient corresponding to the distributed power source and adjust it so that the frequency corresponding to 0 active power in the adjusted droop curve falls within the frequency range in which the distributed power source operates stably; if no, then based on the lower limit of the frequency range in which the distributed power source operates stably, determine the updated droop coefficient corresponding to the distributed power source and adjust it so that the frequency corresponding to 0 active power at rated capacity in the adjusted droop curve falls within the frequency range in which the distributed power source operates stably.

6. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 4.

7. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described in any one of claims 1 to 4.

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