A microgrid intelligent power balance control method, device and system

Abstract

The present application relates to the technical field of power supply and distribution control of power grids, and specifically to a method, device and system for intelligent power balance control of a microgrid, the method comprising: obtaining the output voltage of the microgrid photovoltaic panel line at each acquisition moment, obtaining the influence of light floating through the degree of fluctuation of the local voltage distribution of each output voltage in the output voltage sequence; obtaining the operating steady-state reference voltage by combining the different voltage values ​​in all output voltages and the number of times the different voltage values ​​appear in the output voltage sequence, and then obtaining the voltage change intensity in the line, based on which the boost regulation coefficient is calculated, and the boost regulation value of the line is obtained by combining the difference between the preset maximum boost value and the operating steady-state reference voltage, so as to calculate the target voltage regulation value of the buck-boost converter, and regulate the output voltage of the photovoltaic panel through the buck-boost converter. The present application can maintain the power balance of the microgrid.

Description

Technical Field

[0001] The present application relates to the technical field of power supply and distribution control of power grids, and specifically to a method, device and system for intelligent power balancing control of a microgrid. Background Art

[0002] Micro-Grid is a small power system consisting of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection devices, etc. It can achieve self-control, protection and management, has complete power generation, distribution and power consumption functions, and can effectively optimize the energy within the network. The electricity inside the microgrid mainly comes from distributed energy sources such as photovoltaic and wind power. Usually, the capacity is small, the power source is relatively dispersed and close to the load, which can realize the local consumption and local balance of distributed energy. At the same time, it can also exchange energy with the large power grid and assist each other.

[0003] Ensuring power balance during the operation of microgrids is a key condition for ensuring power supply stability and improving energy efficiency. Power balance enables microgrids to maintain voltage and frequency stability through energy storage and intelligent control technology when facing the volatility of renewable energy, thereby improving power supply reliability.

[0004] In the actual photovoltaic power generation process, traditional technology generally adjusts the output voltage of photovoltaic panels to maintain the consistency of the output voltage so as to keep the power in the microgrid balanced. Since photovoltaic panel power generation is affected by the weather, the output voltage of photovoltaic panels is unstable, and there is a large gap between the output voltage and the voltage regulation value, which results in active power loss during voltage regulation, resulting in poor power balance control in the microgrid. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of this application is to provide a microgrid intelligent power balance control method, device and system, and the technical solutions adopted are as follows:

[0006] In a first aspect, an embodiment of the present application provides a microgrid intelligent power balance control method, comprising the following steps:

[0007] Obtain the output voltage of the microgrid photovoltaic panel line at each collection time to form an output voltage sequence;

[0008] Obtain the light floating influence of each output voltage through the local voltage distribution fluctuation degree of each output voltage in the output voltage sequence;

[0009] Combining different voltage values ​​in all output voltages and the number of times different voltage values ​​appear in the output voltage sequence, obtaining an operating steady-state reference voltage in the circuit;

[0010] Based on the difference between each output voltage in the output voltage sequence and the operating steady-state reference voltage, and the light floating influence of each output voltage, the voltage change intensity in the circuit is obtained;

[0011] Obtaining a boost control coefficient according to the voltage change intensity in the line, and obtaining a boost control value of the line in combination with a difference between a preset maximum boost value and the operating steady-state reference voltage;

[0012] The target voltage regulation value of the buck-boost converter is obtained in combination with the boost regulation value and the operating steady-state reference voltage, and the output voltage of the photovoltaic panel is regulated by the buck-boost converter.

[0013] Preferably, the corresponding calculation formula of the light floating influence degree of each output voltage is: ; In the formula, Indicates the light fluctuation influence of the jth output voltage in the output voltage sequence; taking each output voltage in the output voltage sequence as the center, all output voltages in the preset window are combined into an output voltage window sequence of each output voltage, , Represents the standard deviation and range of the output voltage window sequence of the jth output voltage in the output voltage sequence.

[0014] Preferably, the calculation formula corresponding to the operating steady-state reference voltage in the circuit is: ; In the formula, Ur represents the steady-state reference voltage in the circuit; n represents the number of different voltage values ​​in the output voltage sequence; Indicates the output voltage corresponding to the kth different voltage value; Indicates the number of times the output voltage corresponding to the kth different voltage value appears in the output voltage sequence.

[0015] Preferably, the voltage change intensity in the line corresponds to the calculation formula: ; In the formula, UM represents the voltage variation intensity in the line; represents the relative illumination influence ratio of the jth output voltage in the output voltage sequence, wherein the relative illumination influence ratio of each output voltage is calculated based on the comparison of the illumination floating influence degree of each output voltage; M represents the number of output voltages; It represents the jth output voltage in the output voltage sequence in the circuit; Ur represents the steady-state reference voltage in the circuit.

[0016] Preferably, the corresponding calculation formula of the relative illumination influence ratio of each output voltage is: ; In the formula, It represents the relative illumination influence ratio of the jth output voltage in the output voltage sequence; Indicates the light fluctuation influence of the jth output voltage in the output voltage sequence; Represents the set of illumination fluctuation influences of all output voltages; mean() represents the mean symbol.

[0017] Preferably, the calculation formula of the boost control coefficient is: ; In the formula, k represents the boost control coefficient; UM represents the voltage change intensity in the line; sig() represents the sigmoid function; a represents the adjustment parameter preset to be greater than zero.

[0018] Preferably, the calculation formula corresponding to the boost control value of the circuit is: ; aU represents the boost control value of the line; k represents the boost control coefficient; Ur represents the operating steady-state reference voltage in the line; Indicates the preset maximum boost value in the line.

[0019] Preferably, the target voltage regulation value of the buck-boost converter is the sum of the boost regulation value and the operating steady-state reference voltage.

[0020] In a second aspect, an embodiment of the present application provides a microgrid intelligent power balancing control device, comprising:

[0021] The microgrid data acquisition module obtains the output voltage of the microgrid photovoltaic panel line at each acquisition time and forms an output voltage sequence;

[0022] The microgrid voltage analysis module obtains the light fluctuation influence of each output voltage through the local voltage distribution fluctuation degree of each output voltage in the output voltage sequence; obtains the operation steady-state reference voltage in the line by combining the different voltage values ​​in all output voltages and the number of times different voltage values ​​appear in the output voltage sequence; obtains the voltage change intensity in the line based on the difference between each output voltage in the output voltage sequence and the operation steady-state reference voltage, as well as the light fluctuation influence of each output voltage;

[0023] The microgrid voltage control module obtains a boost control coefficient according to the voltage change intensity in the line, and obtains the boost control value of the line in combination with the difference between a preset maximum boost value and the operating steady-state reference voltage; obtains a target voltage regulation value of the buck-boost converter in combination with the boost control value and the operating steady-state reference voltage, and regulates the output voltage of the photovoltaic panel through the buck-boost converter.

[0024] In a third aspect, an embodiment of the present application also provides a microgrid intelligent power balance control system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above methods when executing the computer program.

[0025] From the above, it can be seen that the microgrid intelligent power balance control method, device and system provided by the present application have at least the following beneficial effects:

[0026] Compared with the traditional method, in order to maintain the power balance in the power grid, the present application uses a DC / DC fixed boost circuit to regulate the output voltage of solar power generation. However, since the power generation of solar panels is seriously affected by weather and time, the output voltage is unstable during the power generation process, which leads to active power loss when the voltage is stabilized by the DC / DC fixed boost circuit, making the output power in the circuit unstable. However, the present application analyzes the output voltage of the photovoltaic panel, analyzes the changes in sunlight at different times during the collection time period, obtains the influence of light fluctuation, and then uses all the output voltages to obtain the voltage change intensity in the circuit, comprehensively evaluates the depth of the solar panel affected by light during the collection time, and obtains the boost control value and the target voltage adjustment value through the above indicators. This value can effectively reduce the active power loss during the DC / DC buck-boost converter and maintain the power balance of the microgrid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A flowchart of a microgrid intelligent power balance control method provided in this application;

[0029] Figure 2 A schematic diagram of the distribution of the illumination floating influence provided for this application;

[0030] Figure 3 A schematic diagram of the steady-state reference voltage distribution provided for this application;

[0031] Figure 4 A schematic diagram of the target voltage regulation value distribution provided for this application;

[0032] Figure 5 A block diagram of a microgrid intelligent power balancing control device provided in this application. DETAILED DESCRIPTION

[0033] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation method, structure, features and effects of a microgrid intelligent power balance control method, device and system proposed in the present application in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0034] Unless otherwise specified and limited, terms such as "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application.

[0035] The following is a detailed description of a microgrid intelligent power balance control method, device and system provided by the present application in conjunction with the accompanying drawings.

[0036] See also Figure 1 , which shows a flow chart of a microgrid intelligent power balance control method provided by an embodiment of the present application, including the following steps:

[0037] Step 1: Obtain the output voltage of the microgrid photovoltaic panel line at each collection time to form an output voltage sequence.

[0038] First, the output voltage of the photovoltaic panel line in the photovoltaic power generation system in the microgrid is collected by a voltage sensor. The collection time is 1s and the collection frequency is 1kHz. The collected voltage data is arranged in the order of collection time, and the arranged voltage data is denoised by Kalman filtering. The denoised data is recorded as the output voltage sequence of the photovoltaic power generation of the microgrid.

[0039] So far, according to the above process of this embodiment, the output voltage of the microgrid photovoltaic panel circuit can be obtained to obtain the output voltage sequence.

[0040] Step 2: Obtain the light fluctuation influence of each output voltage through the local voltage distribution fluctuation degree of each output voltage in the output voltage sequence.

[0041] Solar power generation in a microgrid is a DC power generation mode. The microgrid converts the power of the solar cell into AC power through an inverter through an AC side inductor, and then transmits it to the external power grid. Since the light intensity received by the solar panels is different at different times, the voltage generated by the solar panels at different times is also different, resulting in different output powers at different times. In order to maintain the stability of the microgrid output power, the output voltage of the solar panel needs to be regulated. The greater the output voltage change, the greater the regulation required.

[0042] Based on the above analysis, with each output voltage in the output voltage sequence as the center, all output voltages in the preset window are composed into an output voltage window sequence of each output voltage. In this embodiment, a 9×1 window is obtained with each output voltage of the output voltage sequence of the microgrid photovoltaic panel as the center, and the output voltages in the window corresponding to each output voltage are composed into an output voltage window sequence of each output voltage. In this embodiment, the positions where no output voltage exists in the window are discarded, and only the existing output voltages are retained. Further, based on the local voltage distribution of each output voltage, the influence of light fluctuation of each output voltage is analyzed. Specifically, the standard deviation and extreme value of all output voltages in the output voltage window sequence are calculated, and based on this, the influence of light fluctuation of each output voltage in the output voltage sequence is analyzed. In this embodiment, the corresponding calculation formula is:

[0043] ; In the formula, Indicates the light fluctuation influence of the jth output voltage in the output voltage sequence; , Represents the standard deviation and range of the output voltage window sequence of the jth output voltage in the output voltage sequence.

[0044] When the local illumination intensity changes more dramatically at the jth moment, the number of photons hitting the photovoltaic panel will change more obviously, and the output voltage of the solar panel will change more strongly, making the output voltage change more chaotic in the output voltage window sequence at the jth moment, and the standard deviation and range values ​​will be larger, resulting in a greater illumination floating influence on the jth output voltage in the output voltage sequence, and the stronger the control capability at that moment should be. Specifically, in this embodiment, the distribution of illumination floating influence is as follows: Figure 2 shown.

[0045] Step 3: Combining different voltage values ​​in all output voltages and the number of times different voltage values ​​appear in the output voltage sequence, obtain the operating steady-state reference voltage in the circuit.

[0046] In order to maintain the power balance of the microgrid, the output voltage balance during photovoltaic power generation must be ensured first. Since the solar panels in the natural environment are exposed to different intensities of sunlight at different times, the DC voltage generated by the solar panels is different. In the process of converting DC power into AC power through the inverter, the voltage needs to be stabilized in advance, generally through a buck-boost converter. In the process of voltage stabilization, the best adjustment voltage needs to be found to minimize the total amount of adjustment required for the voltage adjustment process.

[0047] Furthermore, this embodiment takes into account that in the output voltage sequence, the more times the value corresponding to the output voltage appears, the more significant the value is in the microgrid photovoltaic panel circuit. Therefore, the different voltage values ​​in all the output voltages of the circuit and the frequency of occurrence of different voltage values ​​are counted, and the operating steady-state reference voltage in the circuit is calculated based on this. In this embodiment, the specific calculation formula is:

[0048] ; In the formula, Ur represents the steady-state reference voltage in the circuit; n represents the number of different voltage values ​​in the output voltage sequence; Indicates the output voltage corresponding to the kth different voltage value; Indicates the number of times the output voltage corresponding to the kth different voltage value appears in the output voltage sequence.

[0049] For the output voltage at all times in the circuit, if a certain output voltage appears more times, it means that the output voltage is in the state of the photovoltaic panel working frequently, so the weight value attached to the output voltage should be larger, so that the steady-state reference voltage of the circuit is The closer the value of is to the output voltage value with the most occurrences. Specifically, in this embodiment, the running steady-state reference voltage distribution diagram is as follows: Figure 3 As shown, Figure 3 The red dotted line in the middle is the steady-state reference voltage, the blue curve is the output voltage value, the horizontal axis is time, the unit is s, and the vertical axis is voltage, the unit is V.

[0050] Step 4: Based on the difference between each output voltage in the output voltage sequence and the operating steady-state reference voltage, and the light floating influence of each output voltage, the voltage change intensity in the circuit is obtained.

[0051] In the operation of the microgrid, since the solar panels are affected by weather changes, the power of the solar panels also changes according to the weather. The higher the change intensity of the solar panels, the greater the loss of reactive power in the photovoltaic power generation of the microgrid. Therefore, the voltage change intensity in the line is calculated. Preferably, the calculation formula corresponding to the voltage change intensity in this embodiment is:

[0052] ; In the formula, It represents the relative illumination influence ratio of the jth output voltage in the output voltage sequence; Indicates the light fluctuation influence of the jth output voltage in the output voltage sequence; Represents the set of illumination fluctuation influences of all output voltages; mean() represents the mean symbol.

[0053] Furthermore, the voltage change intensity in the circuit is calculated by combining the relative illumination influence ratio of each output voltage and the difference between each output voltage and the operating steady-state reference voltage. The calculation formula is:

[0054] ; In the formula, UM represents the voltage change intensity in the line; M represents the output voltage quantity; It represents the jth output voltage in the output voltage sequence in the circuit; Ur represents the steady-state reference voltage in the circuit.

[0055] When the difference between the output voltage at the time of collection in the circuit and the steady-state reference voltage is closer to 0, it means that the regulation pressure difference of the output voltage is smaller, and when the relative light influence ratio at the time of collection is smaller, the light intensity change received by the solar panel is weaker, so that the value of the voltage change intensity UM in the circuit is smaller.

[0056] Step 5: Obtain a boost control coefficient according to the voltage change intensity in the line, and obtain a boost control value of the line in combination with the difference between a preset maximum boost value and the operating steady-state reference voltage.

[0057] In order to ensure the stability of the buck-boost converter, the switching elements of the buck-boost converter will generate losses during the conduction and shutdown process. When the output voltage increases or decreases, the voltage stress on the switching element increases or decreases, which may cause line losses. In order to reduce the regulation of voltage, the DC / DC boost circuit requires a boost value. Therefore, the boost control coefficient is obtained according to the voltage change intensity in the line, and the boost control value in the line is calculated in combination with the difference between the preset maximum boost value and the operating steady-state reference voltage. Specifically, the calculation formula of the boost control value is:

[0058] ; ; In the formula, k represents the boost control coefficient; UM represents the voltage change intensity in the line; sig() represents the sigmoid function; a represents a regulation parameter preset to be greater than zero, and in this embodiment, the value is 0.5; aU represents the boost control value of the line; Ur represents the operating steady-state reference voltage in the line; Indicates the preset maximum boost value in the circuit, which is 220 in this embodiment.

[0059] When the voltage changes more drastically in the photovoltaic power generation line, the value of the voltage change intensity UM in the line becomes more drastically, and the value may be positive or negative. Therefore, when the absolute value of the voltage change intensity UM is larger, it means that the output voltage of the photovoltaic panel changes more chaotically near the running steady-state reference voltage Ur value. When the value of the boost control coefficient k is negative, the smaller the value, the more drastically the output voltage changes below the running steady-state reference voltage, so the calculated boost control value aU is smaller and negative; when the value of the boost control coefficient k is positive, the larger the value, the more drastically the output voltage changes above the running stable reference voltage, so the value of the boost control value aU should be larger and positive.

[0060] Step six: Acquire a target voltage regulation value of the buck-boost converter by combining the boost regulation value and the operating steady-state reference voltage, and regulate the output voltage of the photovoltaic panel by the buck-boost converter.

[0061] Furthermore, when the value of the boost control value aU is closer to 0, it means that the amplitude of the oscillation of the voltage data of the photovoltaic panel is smaller, and the energy loss in the process of buck-boost is smaller. Therefore, the sum of the boost control value and the operating steady-state reference voltage is used as the target voltage regulation value of the buck-boost converter. For ease of understanding, the calculation formula in this embodiment is: ; Where RU represents the target voltage regulation value of the buck-boost converter.

[0062] It can be understood that when the light intensity received by the photovoltaic panel is stable, the output voltage of the photovoltaic panel is stable, so that the closer the value of the boost control value aU in the circuit is to 0, the smaller the voltage value that the buck-boost converter needs to adjust is, and the target voltage value of the buck-boost converter is The smaller the gap between the output voltage of the photovoltaic panel and the power supply voltage, the smaller the loss in the line. Since the output voltage of the photovoltaic panel is kept at the same voltage value through conversion, the stable DC can reduce the total harmonic distortion in the DC-AC conversion process, reduce the fluctuation of the inverter output power, and keep the operating power of the microgrid in a balanced state.

[0063] Specifically, in this embodiment, the target voltage regulation value distribution diagram is as follows: Figure 4 As shown, Figure 4 In the figure, the blue curve is the output voltage value, the red dotted line is the steady-state reference voltage, the yellow dotted line is the target voltage adjustment value, the horizontal axis is time in seconds, and the vertical axis is voltage in V.

[0064] Through the above process, the target voltage regulation value of the buck-boost converter can be obtained, which is used as the input of the buck-boost converter to perform buck-boost conversion on the pressure of the photovoltaic panel. The converted voltage is further used as the input of the three-phase inverter line to convert the DC power generated by the photovoltaic panel into AC power. The stable DC power can ensure that the electromagnetic interference generated in the process of conversion to AC power is small, making the converted sinusoidal waveform smoother, while reducing energy loss and ensuring the stable state of power. Finally, the converted AC power is incorporated into the microgrid.

[0065] On the other hand, an embodiment of the present application provides a microgrid intelligent power balance control device, the device comprising:

[0066] The microgrid data acquisition module obtains the output voltage of the microgrid photovoltaic panel at each acquisition time and forms an output voltage sequence;

[0067] The microgrid voltage analysis module obtains the light fluctuation influence of each output voltage through the local voltage distribution fluctuation degree of each output voltage in the output voltage sequence; obtains the operation steady-state reference voltage in the line by combining the different voltage values ​​in all output voltages and the number of times different voltage values ​​appear in the output voltage sequence; obtains the voltage change intensity in the line based on the difference between each output voltage in the output voltage sequence and the operation steady-state reference voltage, as well as the light fluctuation influence of each output voltage;

[0068] The microgrid voltage control module obtains a boost control coefficient according to the voltage change intensity in the line, and obtains the boost control value of the line in combination with the difference between a preset maximum boost value and the operating steady-state reference voltage; obtains a target voltage regulation value of the buck-boost converter in combination with the boost control value and the operating steady-state reference voltage, and regulates the output voltage of the photovoltaic panel through the buck-boost converter.

[0069] Specifically, in this embodiment, the block diagram of the microgrid intelligent power balance control device is as follows: Figure 5 shown.

[0070] Based on the same inventive concept as the above method, an embodiment of the present application also provides a microgrid intelligent power balance control system, including a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps of any one of the above-mentioned microgrid intelligent power balance control methods are implemented.

[0071] It is to be understood that the sequence of the embodiments of the present application described above is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0072] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0073] The above content is only an implementation method of the present application and is not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the protection scope of the present application.

Claims

1. A microgrid intelligent power balance control method, characterized in that: The following steps are involved: Obtain the output voltage of the microgrid photovoltaic panel line at each collection time to form an output voltage sequence; Obtain the light floating influence of each output voltage through the local voltage distribution fluctuation degree of each output voltage in the output voltage sequence; Combining different voltage values ​​in all output voltages and the number of times different voltage values ​​appear in the output voltage sequence, obtaining an operating steady-state reference voltage in the circuit; Based on the difference between each output voltage in the output voltage sequence and the operating steady-state reference voltage, and the light floating influence of each output voltage, the voltage change intensity in the circuit is obtained; Obtaining a boost control coefficient according to the voltage change intensity in the line, and obtaining a boost control value of the line in combination with a difference between a preset maximum boost value and the operating steady-state reference voltage; The target voltage regulation value of the buck-boost converter is obtained in combination with the boost regulation value and the operating steady-state reference voltage, and the output voltage of the photovoltaic panel is regulated by the buck-boost converter.

2. A microgrid intelligent power balance control method according to claim 1, characterized in that: The corresponding calculation formula for the light fluctuation influence of each output voltage is: ; In the formula, Indicates the light fluctuation influence of the jth output voltage in the output voltage sequence; taking each output voltage in the output voltage sequence as the center, all output voltages in the preset window are combined into an output voltage window sequence of each output voltage, , Represents the standard deviation and range of the output voltage window sequence of the jth output voltage in the output voltage sequence.

3. A microgrid intelligent power balance control method as claimed in claim 1, characterized in that: The corresponding calculation formula for the operating steady-state reference voltage in the circuit is: ; In the formula, Ur represents the steady-state reference voltage in the circuit; n represents the number of different voltage values ​​in the output voltage sequence; Indicates the output voltage corresponding to the kth different voltage value; Indicates the number of times the output voltage corresponding to the kth different voltage value appears in the output voltage sequence.

4. A microgrid intelligent power balance control method according to claim 1, characterized in that: The corresponding calculation formula for the voltage change intensity in the line is: ; In the formula, UM represents the voltage variation intensity in the line; represents the relative illumination influence ratio of the jth output voltage in the output voltage sequence, wherein the relative illumination influence ratio of each output voltage is calculated based on the comparison of the illumination floating influence degree of each output voltage; M represents the number of output voltages; It represents the jth output voltage in the output voltage sequence in the circuit; Ur represents the steady-state reference voltage in the circuit.

5. A microgrid intelligent power balance control method as claimed in claim 4, characterized in that: The corresponding calculation formula for the relative illumination influence ratio of each output voltage is: ; In the formula, It represents the relative illumination influence ratio of the jth output voltage in the output voltage sequence; Indicates the light fluctuation influence of the jth output voltage in the output voltage sequence; Represents the set of illumination fluctuation influences of all output voltages; mean() represents the mean symbol.

6. A microgrid intelligent power balance control method according to claim 1, characterized in that: The calculation formula of the boost control coefficient is: ; In the formula, k represents the boost control coefficient; UM represents the voltage change intensity in the line; sig() represents the sigmoid function; a represents the adjustment parameter preset to be greater than zero.

7. A microgrid intelligent power balance control method according to claim 1, characterized in that: The corresponding calculation formula of the boost control value of the circuit is: ; aU represents the boost control value of the line; k represents the boost control coefficient; Ur represents the operating steady-state reference voltage in the line; Indicates the preset maximum boost value in the line.

8. A microgrid intelligent power balance control method as claimed in claim 1, characterized in that: The target voltage regulation value of the buck-boost converter is the sum of the boost regulation value and the operating steady-state reference voltage.

9. A microgrid intelligent power balance control device, characterized in that: The device comprises: The microgrid data acquisition module obtains the output voltage of the microgrid photovoltaic panel line at each acquisition time and forms an output voltage sequence; The microgrid voltage analysis module obtains the light fluctuation influence of each output voltage through the local voltage distribution fluctuation degree of each output voltage in the output voltage sequence; obtains the operation steady-state reference voltage in the line by combining the different voltage values ​​in all output voltages and the number of times different voltage values ​​appear in the output voltage sequence; obtains the voltage change intensity in the line based on the difference between each output voltage in the output voltage sequence and the operation steady-state reference voltage, as well as the light fluctuation influence of each output voltage; The microgrid voltage control module obtains a boost control coefficient according to the voltage change intensity in the line, and obtains the boost control value of the line in combination with the difference between a preset maximum boost value and the operating steady-state reference voltage; obtains a target voltage regulation value of the buck-boost converter in combination with the boost control value and the operating steady-state reference voltage, and regulates the output voltage of the photovoltaic panel through the buck-boost converter.

10. A microgrid intelligent power balance control system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

Images