Microgrid distributed secondary voltage control method and system based on voltage constraint

Abstract

The present invention discloses a microgrid distributed secondary voltage control method and system based on voltage constraints, relating to the field of microgrid control technology. The method comprises the following steps: establishing a secondary voltage control model for a distributed generator; designing an event trigger function based on the continuous voltage amplitude information of the generator, and determining a corresponding event trigger mechanism; designing a voltage constraint projection scheme, taking into account the dynamic changes in the load rate to perform load rate adaptive constraints on the voltage amplitude, and using a constraint projection function to project the voltage amplitude of the distributed generator into the range of the voltage constraint; designing a distributed secondary voltage controller based on the voltage constraint projection scheme to perform secondary voltage control on the microgrid. The present invention uses a dynamic event trigger mechanism and a distributed collaborative control strategy, combined with a constrained voltage projection technology, to achieve rapid recovery of the bus voltage to a reference value under constraint conditions and significantly reduce the communication frequency.

Description

Technical Field

[0001] The present invention relates to the field of microgrid control technology, and in particular to a microgrid distributed secondary voltage control method and system based on voltage constraint. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Microgrids, as an important means of integrating distributed energy resources into the main grid, play a key role in increasing renewable energy penetration and enhancing grid resilience. Microgrids operate in two modes: grid-connected and islanded. Voltage control in islanded mode is particularly critical. In islanded operation, the microgrid loses the voltage support of the main grid and relies on coordinated control of its internal distributed generators to maintain bus voltage stability.

[0004] Droop control is currently the most widely used primary control strategy. However, due to the influence of the droop coefficient, droop control will cause a certain voltage offset and cannot guarantee that the voltage will return to the bus voltage reference value. Therefore, microgrid secondary voltage control is introduced to compensate for the error caused by droop control and restore the microgrid voltage to the reference value.

[0005] Microgrid secondary voltage control methods primarily fall into two categories: centralized and distributed. Traditional centralized control relies on a central controller, posing a risk of single-point failure. Existing distributed control often uses periodic communication, leading to excessive network load. Furthermore, busbar voltages are susceptible to exceeding limits due to load fluctuations, making it difficult for existing methods to reduce communication while ensuring voltage safety and stability. Therefore, a distributed secondary voltage control method is urgently needed that can achieve rapid and stable control under voltage constraints while significantly reducing communication frequency to meet the requirements for safe and efficient operation of isolated microgrids. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a distributed secondary voltage control method and system for a microgrid based on voltage constraints. Through a dynamic event triggering mechanism and a distributed collaborative control strategy, combined with constrained voltage projection technology, the bus voltage can be quickly restored to a reference value under constrained conditions and the communication frequency can be significantly reduced.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A first aspect of the present invention provides a microgrid distributed secondary voltage control method based on voltage constraint, comprising the following steps:

[0009] Obtain data from microgrid generators and establish a secondary voltage control model for distributed generators;

[0010] Design event trigger functions based on the continuous voltage amplitude information of the generator and determine the corresponding event trigger mechanism;

[0011] Design a voltage constraint projection scheme. Specifically, consider the dynamic changes of the load factor to perform load factor adaptive constraints on the voltage amplitude, and use a constraint projection function to project the voltage amplitude of the distributed generator into the range of the voltage constraint.

[0012] A distributed secondary voltage controller is designed based on the voltage constraint projection scheme, and the distributed secondary voltage controller is used to control the secondary voltage of the microgrid.

[0013] A second aspect of the present invention provides a microgrid distributed secondary voltage control system based on voltage constraints, comprising:

[0014] a data acquisition module configured to acquire data of a microgrid generator and establish a secondary voltage control model of the distributed generator;

[0015] a trigger mechanism setting module, configured to design an event trigger function according to continuous voltage amplitude information of the generator and determine a corresponding event trigger mechanism;

[0016] The voltage constraint design module is configured to design a voltage constraint projection scheme. Specifically, the voltage amplitude is adaptively constrained to the load factor taking into account the dynamic changes in the load factor, and the voltage amplitude of the distributed generator is projected into the range of the voltage constraint using a constraint projection function.

[0017] The controller control module is configured to construct a distributed secondary voltage controller based on a voltage constraint projection scheme, and use the distributed secondary voltage controller to control the secondary voltage of the microgrid.

[0018] A third aspect of the present invention provides a medium having a program stored thereon, which, when executed by a processor, implements the steps of the microgrid distributed secondary voltage control method based on voltage constraints as described in the first aspect of the present invention.

[0019] The fourth aspect of the present invention provides a device comprising a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps in the microgrid distributed secondary voltage control method based on voltage constraints as described in the first aspect of the present invention are implemented.

[0020] A fifth aspect of the present invention provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the microgrid distributed secondary voltage control method based on voltage constraints as described in the first aspect of the present invention.

[0021] One or more of the above technical solutions have the following beneficial effects:

[0022] This invention discloses a distributed secondary voltage control method and system for a microgrid based on voltage constraints. This method dynamically adjusts the communication frequency between distributed generators through an event-triggered mechanism, triggering data exchange only when necessary to avoid redundant communication. This method addresses the network resource waste caused by traditional periodic communication and enables the microgrid to maintain efficient operation at low communication costs. By dynamically linking the event-triggered mechanism with voltage safety constraints, the system possesses enhanced system state perception and adaptability, effectively improving the stability and communication efficiency of the microgrid control system.

[0023] This invention incorporates a voltage constraint projection function into the control strategy, adaptively constraining the voltage amplitude based on the load factor to ensure safe operation of the island microgrid. This approach conserves control resources and energy consumption. Real-time correction of voltage deviations ensures that all distributed generator voltages remain within a safe range, preventing equipment damage or system instability caused by excessive voltage deviations.

[0024] The present invention adopts a fully distributed architecture. Each generator can achieve global voltage consistency and reference value tracking by relying only on local neighbor information. No central controller is required. The system has high reliability and strong scalability.

[0025] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 This is a flow chart of a microgrid distributed secondary voltage control method based on voltage constraint in embodiment 1 of the present invention;

[0028] Figure 2 This is a block diagram of a microgrid system in Embodiment 1 of the present invention;

[0029] Figure 3 This is a topological diagram of the communication network of the distributed generator in the first embodiment of the present invention;

[0030] Figure 4 This is a diagram showing the voltage amplitude variation of the distributed generator in the first embodiment of the present invention;

[0031] Figure 5 This is a diagram recording the triggering moments of each distributed generator in the first embodiment of the present invention. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0034] Example 1:

[0035] The first embodiment of the present invention provides a microgrid distributed secondary voltage control method based on voltage constraint, such as Figure 1 As shown, the method specifically includes: establishing a secondary voltage control model for distributed generators, determining a communication topology, setting a reference value for the bus voltage and a voltage constraint range; designing an event trigger function and determining a corresponding event trigger mechanism to trigger communication only when the voltage deviation exceeds a dynamic threshold; designing a voltage constraint projection scheme to project the voltage amplitude information of the distributed generators into the voltage constraint range; and designing a distributed secondary voltage control strategy. Each generator executes the voltage control strategy within a preset triggering time interval based on its own voltage amplitude information and the voltage amplitude information from adjacent generators at the triggering moment, thereby realizing event-triggered distributed secondary voltage control of the microgrid under voltage constraints. This embodiment reduces the number of communications between distributed generators through the event triggering mechanism, thereby reducing communication costs, and can achieve rapid voltage stabilization under voltage constraints, thereby improving safety.

[0036] The specific steps include:

[0037] Step 1: Obtain the data of the microgrid generator and establish the secondary voltage control model of the distributed generator.

[0038] Step 1.1: Obtain the data of the microgrid generator, including the generator's own voltage amplitude, the reference value of the bus voltage, and the voltage constraint range.

[0039] Step 1.2: Establish the secondary voltage control model of the distributed generator.

[0040] Step 1.2.1: Determine the communication topology between the distributed generators in the microgrid system to be controlled.

[0041] The actual structure of the microgrid system to be controlled is obtained, and the communication topology of the microgrid system to be controlled is obtained by simplifying the microgrid system to be controlled.

[0042] It should be noted that the method of this embodiment is applicable to the case where the communication topology of the microgrid is an undirected connected graph.

[0043] Step 1.2.2: Set the reference value of the bus voltage and the voltage constraint range, and establish the secondary voltage control model of the distributed generators based on the communication topology between the distributed generators.

[0044] In a specific embodiment, considering The microgrid system consists of a number of distributed generators connected together. The reactive power and voltage droop control strategy of the microgrid is:

[0045] .

[0046] in, , is the number of distributed generators, i is the distributed generator number, is the voltage amplitude information of the i-th distributed generator, is the voltage amplitude information of droop control, and are the droop control coefficient and reactive power of the i-th distributed generator respectively.

[0047] The main goal of secondary voltage control is to eliminate the voltage deviation caused by droop control. Therefore, a voltage compensation is added to the voltage amplitude for droop control, which is expressed as:

[0048] .

[0049] in, represents the rate of change of the voltage amplitude of the droop control, It represents the rate of change of the reactive power of the generator, Indicates the rate of change of the generator's output voltage amplitude.

[0050] The secondary voltage control model of each distributed generator is as follows:

[0051] .

[0052] in, is the voltage compensation amount of the i-th distributed generator that needs to be designed.

[0053] Step 2: Design the event trigger function based on the continuous voltage amplitude information of the generator and determine the corresponding event trigger mechanism.

[0054] In a specific embodiment, each distributed generator continuously monitors its own voltage amplitude information , define the state error and event trigger function as follows:

[0055] ,

[0056] ,

[0057] .

[0058] in, is the state error, represents the most recent triggering time of the i-th distributed generator before the current time, is the voltage amplitude of the i-th distributed generator at the most recent triggering moment before the current moment t, It is half of the voltage tolerance range. represents the Euclidean norm, represents the minimum voltage constraint that satisfies the safe operation of the microgrid system, represents the maximum voltage constraint that satisfies the safe operation of the microgrid system, is the bus voltage reference value, The most recent triggering moment of the i-th distributed generator before the next moment, is a positive number, indicating the initial sensitivity of the triggered communication of the i-th distributed generator, is a positive number, indicating the decay rate of the triggering threshold of the i-th distributed generator. A small positive number to avoid the denominator being zero; and set the first triggering moment as the initial moment , at the initial moment, all distributed generators transmit the current voltage amplitude to the adjacent generators, For the current moment, at the current moment satisfy When the event triggering mechanism is met, the distributed generator sends the current voltage amplitude information to the adjacent generator, otherwise no communication is performed.

[0059] This embodiment improves the event trigger function. This design ensures that when the generator voltage amplitude approaches the constraint boundary, the overall threshold decreases, thereby increasing trigger sensitivity and making it easier to trigger communication and correct voltage deviations. Conversely, when the system voltage is in the center of the safe zone, the trigger threshold is higher, avoiding redundant communication. This method achieves dynamic linkage adjustment between the event trigger mechanism and voltage safety constraints, providing stronger system status perception and adaptability, and effectively improving the stability and communication efficiency of the microgrid control system.

[0060] Step 3: Design a voltage constraint projection scheme.

[0061] Specifically, the voltage amplitude is adaptively constrained to take into account the dynamic changes in the load factor, and a constraint projection function is used to project the voltage amplitude of the distributed generator into the voltage constraint range. Traditional fixed voltage constraints mean that the allowable voltage fluctuation range is fixed throughout the entire system operation. However, this approach currently has some shortcomings. For example, under high load conditions, fixed voltage constraints may not be able to effectively cope with sudden increases in power demand, causing voltage fluctuations to exceed the allowable range, thereby affecting system stability. Under low load conditions, fixed voltage constraints may be too strict, resulting in unnecessary energy consumption in voltage regulation.

[0062] To address the shortcomings of the aforementioned traditional methods, this embodiment provides a load-rate adaptive voltage constraint that dynamically adjusts the allowable voltage range based on the current load rate. For example, when the load rate is high, the allowable voltage fluctuation range is narrowed to ensure system stability under high loads; while when the load rate is low, the allowable voltage fluctuation range is widened to conserve control resources and energy consumption.

[0063] In a specific embodiment, considering that the voltage amplitude of the distributed generator needs to meet certain constraints to achieve safe operation of the island microgrid, the voltage constraint range is dynamically adjusted according to the current load rate. The method for defining the voltage constraint range is:

[0064] ,

[0065] .

[0066] in, represents the minimum voltage constraint that satisfies the safe operation of the microgrid system, represents the maximum voltage constraint that satisfies the safe operation of the microgrid system, is the bus voltage reference value, is the baseline deviation, Indicates the current load power of the microgrid system, Indicates the rated load power of the microgrid system.

[0067] Define the voltage constraint set as , the voltage amplitude of the distributed generator is projected into the range of the voltage constraint using the constraint projection function. The specific calculation method is:

[0068] .

[0069] Where R represents all real numbers, v represents the voltage value, represents the set of voltage amplitudes that meet the voltage constraint range, represents the minimum voltage constraint that satisfies the safe operation of the microgrid system, represents the maximum voltage constraint that satisfies the safe operation of the microgrid system, represents the voltage amplitude of the i-th distributed generator, is the projection function, which represents the voltage amplitude of the i-th distributed generator projected onto the voltage constraint.

[0070] Step 4: Design a distributed secondary voltage controller based on the voltage constraint projection scheme, and use the distributed secondary voltage controller to control the secondary voltage of the microgrid.

[0071] In a specific embodiment, a distributed secondary voltage controller is designed. To implement event-triggered distributed secondary voltage control of a microgrid under voltage constraints, each generator executes a voltage control protocol within a preset triggering time interval based on its own voltage information and voltage information from neighboring generators at the triggering moment:

[0072] .

[0073] in, is the voltage compensation amount of the i-th distributed generator to be designed, when hour, is the communication connection coefficient of the distributed generator communication network topology, which represents the communication relationship between the i-th distributed generator and the j-th distributed generator. When the i-th distributed generator and the j-th distributed generator can communicate and transmit information, ,otherwise ,when When, define That is, the generator cannot transmit information to itself. is the set of neighboring generators that can communicate with distributed generator i, is the voltage amplitude of the jth distributed generator at the most recent triggering moment before the current moment t, Indicates whether the i-th distributed generator of the microgrid can obtain the bus reference voltage information. When , it means that the i-th distributed generator can obtain the bus reference value information, otherwise the distributed generator cannot obtain the bus voltage reference value. In the present invention, it is stipulated that at least one distributed generator can obtain the bus reference value voltage information; It is a positive number, indicating the gain of the constraint projection term. A higher value can be set appropriately to ensure that the voltage variation range is within the voltage constraint range. It represents the voltage amplitude of the i-th distributed generator at the most recent triggering time before the current time t projected onto the voltage constraint.

[0074] The first item on the right side of the above control protocol Used to drive the voltage amplitudes of each distributed generator to be consistent; the second Used to drive the voltage amplitude of each distributed generator to track the bus reference voltage; the third It is used to correct the voltage amplitude of distributed generators to the voltage constraint range through constraint projection.

[0075] In order to verify the effectiveness of the method in this embodiment, a simulation experiment was conducted. Consider an island microgrid system with four distributed generators, such as Figure 2 As shown, the microgrid system of this embodiment includes four distributed generators and their connecting lines. The four distributed generators are distributed generator 1 (DG1), distributed generator 2 (DG2), distributed generator 3 (DG3), and distributed generator 4 (DG4), connected to loads 1, 2, 3, and 4, respectively. Distributed generators 1 and 2 are connected via line impedance 1, distributed generators 3 and 4 are connected via line impedance 3, and distributed generators 2 and 3 are connected via line impedance 2. Distributed generator 2 is configured to obtain bus voltage reference information.

[0076] This embodiment is described by taking a microgrid system composed of four distributed generators as an example. In some other implementation examples, the number of distributed generators can be set according to actual conditions.

[0077] Figure 3 It represents the communication topology between four distributed generators, where distributed generator 2 is set to obtain bus voltage reference value information, where: The bus voltage is set as 220V as the reference value, 10V as the benchmark deviation, and 100kW as the rated load power of the microgrid system. At the initial moment, the load power of the microgrid system is 50kW, and the voltage constraint range is 220V±5V. The initial moment is set as the first trigger moment. At the initial moment, all distributed generators transmit the current voltage amplitude information. At t=1s, the load power of the microgrid system is increased to 80kW, and the voltage constraint range becomes 220V±2V. The voltage amplitude changes of all distributed generators are as follows: Figure 4 As shown in the figure, the dotted line represents the bus voltage reference value. It can be seen that the voltage amplitudes of all distributed generators are quickly corrected to within the voltage constraint range. After the voltage constraint range changes, they can also respond quickly and correct the voltage amplitudes to within the voltage constraint range. Within the voltage constraint range, they tend to be consistent with the bus voltage reference value, avoiding voltage over-limit and effectively ensuring the safe operation of the microgrid. Figure 5 The communication triggering moments of the four distributed generators are recorded. The horizontal axis of " is the triggering moment of the distributed generator. It can be seen that when the voltage amplitude of the generator is close to the constraint boundary, the overall control effect will be achieved through more communication. After stabilization, the communication between distributed generators is significantly reduced. The communication between distributed generators is discrete, which significantly reduces the number of communications and reduces the communication cost.

[0078] Example 2:

[0079] A second embodiment of the present invention provides a microgrid distributed secondary voltage control system based on voltage constraints, including:

[0080] a data acquisition module configured to acquire data of a microgrid generator and establish a secondary voltage control model of the distributed generator;

[0081] a trigger mechanism setting module, configured to design an event trigger function according to continuous voltage amplitude information of the generator and determine a corresponding event trigger mechanism;

[0082] The voltage constraint design module is configured to design a voltage constraint projection scheme. Specifically, the voltage amplitude is adaptively constrained to the load factor taking into account the dynamic changes in the load factor, and the voltage amplitude of the distributed generator is projected into the range of the voltage constraint using a constraint projection function.

[0083] The controller control module is configured to construct a distributed secondary voltage controller based on a voltage constraint projection scheme, and use the distributed secondary voltage controller to control the secondary voltage of the microgrid.

[0084] Example 3:

[0085] A third embodiment of the present invention provides a medium having a program stored thereon. When the program is executed by a processor, the steps of the microgrid distributed secondary voltage control method based on voltage constraint as described in the first embodiment of the present invention are implemented.

[0086] Example 4:

[0087] Embodiment 4 of the present invention provides a device, including a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the microgrid distributed secondary voltage control method based on voltage constraints as described in Embodiment 1 of the present invention are implemented.

[0088] Embodiment 5:

[0089] A fifth embodiment of the present invention provides a computer program product, including a computer program. When the computer program is executed by a processor, the computer program implements the steps of the microgrid distributed secondary voltage control method based on voltage constraints as described in the first embodiment of the present invention.

[0090] The steps involved in the above embodiments 2, 3, 4 and 5 correspond to those in the method embodiment 1. For the specific implementation methods, please refer to the relevant description part of the embodiment 1.

[0091] Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using a general-purpose computer device. Alternatively, they can be implemented using program code executable by a computing device, which can then be stored in a storage device and executed by the computing device. Alternatively, they can be fabricated into separate integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0092] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A distributed secondary voltage control method for a microgrid based on voltage constraints, characterized in that: The following steps are involved: Obtain data from microgrid generators and establish a secondary voltage control model for distributed generators; Design event trigger functions based on the continuous voltage amplitude information of the generator and determine the corresponding event trigger mechanism; The event trigger function is: ， ， ， in, is the state error, is the voltage amplitude information of the i-th distributed generator, 、 is the most recent triggering moment of the i-th distributed generator before the current moment and the next moment, is the voltage amplitude of the i-th distributed generator at the most recent triggering moment before the current moment t, is half of the voltage tolerance range. is the Euclidean norm, 、 The minimum and maximum voltage constraints for the safe operation of the microgrid system. is the bus voltage reference value, 、 is a positive number, indicating the initial sensitivity of the triggered communication of the i-th distributed generator and the decay rate of the trigger threshold, It is a small positive number to avoid the denominator being zero; Design a voltage constraint projection scheme. Specifically, consider the dynamic changes of the load factor to perform load factor adaptive constraints on the voltage amplitude, and use a constraint projection function to project the voltage amplitude of the distributed generator into the range of the voltage constraint. A distributed secondary voltage controller is designed based on the voltage constraint projection scheme, and the distributed secondary voltage controller is used to control the secondary voltage of the microgrid. The voltage control protocol of the distributed secondary voltage controller is: ， in, is the voltage compensation amount of the i-th distributed generator, is the communication connection coefficient of the distributed generator communication network topology, which represents the communication relationship between the i-th distributed generator and the j-th distributed generator. is the set of neighboring generators communicating with distributed generator i, 、 is the voltage amplitude of the jth distributed generator at the most recent triggering moment before the current moment t and the voltage amplitude projected onto the voltage constraint, Whether the i-th distributed generator of the microgrid can obtain the bus reference voltage information, A positive number, indicating the gain of the constraint projection term.

2. The microgrid distributed secondary voltage control method based on voltage constraint according to claim 1, characterized in that: The specific steps to establish the secondary voltage control model of distributed generators are: Determine the communication topology between distributed generators in the microgrid system to be controlled; The reference value of the bus voltage and the voltage constraint range are set, and the secondary voltage control model of the distributed generators is established according to the communication topology structure between the distributed generators.

3. The microgrid distributed secondary voltage control method based on voltage constraint according to claim 1, characterized in that: Define the voltage constraint as: ， Where R represents all real numbers, v represents the voltage value, represents the set of voltage amplitudes that meet the voltage constraint range, represents the minimum voltage constraint that satisfies the safe operation of the microgrid system, It represents the maximum voltage constraint that satisfies the safe operation of the microgrid system.

4. The microgrid distributed secondary voltage control method based on voltage constraint according to claim 3, characterized in that: The voltage amplitude of the distributed generator is projected into the range of the voltage constraint using the constraint projection function. The specific calculation method is: ， in, represents the voltage amplitude of the i-th distributed generator, is the projection function, which represents the voltage amplitude of the i-th distributed generator projected onto the voltage constraint.

5. A microgrid distributed secondary voltage control system based on voltage constraints, characterized in that: include: a data acquisition module configured to acquire data of a microgrid generator and establish a secondary voltage control model of the distributed generator; a trigger mechanism setting module, configured to design an event trigger function according to continuous voltage amplitude information of the generator and determine a corresponding event trigger mechanism; The event trigger function is: ， ， ， in, is the state error, is the voltage amplitude information of the i-th distributed generator, 、 is the most recent triggering moment of the i-th distributed generator between the current moment and the next moment, is the voltage amplitude of the i-th distributed generator at the most recent triggering moment before the current moment t, It is half of the voltage tolerance range. is the Euclidean norm, 、 The minimum and maximum voltage constraints for the safe operation of the microgrid system. is the bus voltage reference value, 、 is a positive number, indicating the initial sensitivity of the triggered communication of the i-th distributed generator and the decay rate of the trigger threshold, is a small positive number to avoid the denominator being zero; the voltage constraint design module is configured to design a voltage constraint projection scheme. Specifically, the voltage amplitude is adaptively constrained by the load factor considering the dynamic change of the load factor, and the voltage amplitude of the distributed generator is projected into the range of the voltage constraint using the constraint projection function; a controller control module configured to construct a distributed secondary voltage controller based on a voltage constraint projection scheme, and perform secondary voltage control on the microgrid using the distributed secondary voltage controller; The voltage control protocol of the distributed secondary voltage controller is: ， in, is the voltage compensation amount of the i-th distributed generator, is the communication connection coefficient of the distributed generator communication network topology, which represents the communication relationship between the i-th distributed generator and the j-th distributed generator. is the set of neighboring generators communicating with distributed generator i, 、 is the voltage amplitude of the jth distributed generator at the most recent triggering moment before the current moment t and the voltage amplitude projected onto the voltage constraint, Whether the i-th distributed generator of the microgrid can obtain the bus reference voltage information, A positive number, indicating the gain of the constraint projection term.

6. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the microgrid distributed secondary voltage control method based on voltage constraints according to any one of claims 1 to 4 is implemented.

7. A computer-readable storage medium, characterized in that A plurality of instructions are stored therein, and the instructions are suitable for being loaded by a processor of a terminal device and executing the microgrid distributed secondary voltage control method based on voltage constraints according to any one of claims 1 to 4.

8. A terminal device, characterized in that: The method comprises a processor and a computer-readable storage medium, wherein the processor is used to implement various instructions; and the computer-readable storage medium is used to store multiple instructions, wherein the instructions are suitable for being loaded by the processor and executed by the microgrid distributed secondary voltage control method based on voltage constraints according to any one of claims 1 to 4.

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