Micro-grid distributed secondary voltage control method and system based on voltage constraint

Abstract

The invention discloses a microgrid distributed secondary voltage control method and system based on voltage constraint, and relates to the technical field of microgrid control. The method comprises the following steps: establishing a secondary voltage control model of the distributed generator; designing an event trigger function according to the continuous voltage amplitude information of the generator, and determining a corresponding event trigger mechanism; designing a voltage constraint projection scheme, performing load rate adaptive constraint on the voltage amplitude by considering the dynamic change of the load rate, and projecting the voltage amplitude of the distributed generator into a voltage constraint range by adopting a constraint projection function; and designing a distributed secondary voltage controller based on the voltage constraint projection scheme, and performing secondary voltage control on the micro-grid. Through a dynamic event triggering mechanism and a distributed cooperative control strategy and in combination with a constraint voltage projection technology, the bus voltage is quickly recovered to a reference value under a constraint condition, and the communication frequency is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of microgrid control, and particularly to a distributed secondary voltage control method and system for a microgrid based on voltage constraints. Background Technique

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

[0003] As an important form of distributed energy access to the large power grid, the microgrid plays a key role in improving the penetration rate of renewable energy and enhancing the resilience of the power grid. The operation modes of the microgrid are divided into grid-connected and islanding modes, and the voltage control in the islanding mode is particularly crucial. When operating in the islanding mode, the microgrid loses the voltage support of the large power grid and needs to rely on internal distributed generators to maintain the bus voltage stability through coordinated control.

[0004] The droop control is the most widely used primary control strategy at present. However, due to the influence of the droop coefficient, the droop control will cause a certain voltage deviation and cannot ensure that the voltage is restored to the bus voltage reference value. Therefore, the microgrid secondary voltage control is introduced to compensate for the error caused by the droop control and make the microgrid voltage restored to the reference value.

[0005] The microgrid secondary voltage control methods mainly include two categories: centralized control and distributed control. The traditional centralized control relies on a central controller and has a single-point failure risk; while the existing distributed control mostly uses periodic communication, resulting in an excessive network load; in addition, the bus voltage is prone to overlimit due to load fluctuations, and it is difficult for the existing methods to ensure voltage safety and stability while reducing communication. Therefore, there is an urgent need for a distributed secondary voltage control method that can achieve fast and stable control under voltage constraints and significantly reduce the communication frequency to meet the requirements of safe and efficient operation of the islanded microgrid. Summary of the Invention

[0006] Aiming at the deficiencies 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, which can quickly restore the bus voltage to the reference value under the constraint conditions through a dynamic event-triggering mechanism and a distributed cooperative control strategy, and significantly reduce the communication frequency.

[0007] To achieve the above purpose, the present invention is realized by the following technical solutions: The first aspect of the present invention provides a distributed secondary voltage control method for a microgrid based on voltage constraints, including the following steps: Obtain the data of the microgrid generator and establish a secondary voltage control model for the distributed generator; Design an event-triggering function based on the continuous voltage amplitude information of the generator and determine the corresponding event-triggering mechanism; Design a voltage constraint projection scheme. Specifically, considering the dynamic change of the load rate, perform load rate adaptive constraint on the voltage amplitude, and use a constraint projection function to project the voltage amplitude of the distributed generator into the range of voltage constraints; Design a distributed secondary voltage controller based on the voltage constraint projection scheme, and use the distributed secondary voltage controller to perform secondary voltage control on the microgrid.

[0008] The second aspect of the present invention provides a distributed secondary voltage control system for a microgrid based on voltage constraints, including: A data acquisition module, configured to acquire data of the generators in the microgrid and establish a secondary voltage control model for the distributed generators; A trigger mechanism setting module, configured to design an event-triggering function based on the continuous voltage amplitude information of the generator and determine the corresponding event-triggering mechanism; A voltage constraint design module, configured to design a voltage constraint projection scheme. Specifically, considering the dynamic change of the load rate, perform load rate adaptive constraint on the voltage amplitude, and use a constraint projection function to project the voltage amplitude of the distributed generators into the range of voltage constraints; A controller control module, configured to construct a distributed secondary voltage controller based on the voltage constraint projection scheme, and use the distributed secondary voltage controller to perform secondary voltage control on the microgrid.

[0009] The third aspect of the present invention provides a medium, on which a program is stored, and when the program is executed by a processor, the steps in the method for distributed secondary voltage control of a microgrid based on voltage constraints as described in the first aspect of the present invention are implemented.

[0010] The fourth aspect of the present invention provides a device, including a memory, a processor, and a program stored on the memory and executable on the processor. When the processor executes the program, the steps in the method for distributed secondary voltage control of a microgrid based on voltage constraints as described in the first aspect of the present invention are implemented.

[0011] The fifth aspect of the present invention provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps in the method for distributed secondary voltage control of a microgrid based on voltage constraints as described in the first aspect of the present invention are implemented.

[0012] The above one or more technical solutions have the following beneficial effects: The present invention discloses a distributed secondary voltage control method and system for a microgrid based on voltage constraints. By means of an event-triggered mechanism, the communication frequency among distributed generators is dynamically adjusted, and data exchange is triggered only at necessary moments to avoid redundant communication, solving the problem of network resource waste caused by traditional periodic communication, and enabling the microgrid to still operate efficiently at low communication costs. Through the dynamic linkage adjustment of the event-triggered mechanism and voltage security constraints, the present invention has a stronger system state perception ability and adaptability, effectively improving the stability and communication efficiency of the microgrid control system.

[0013] The present invention introduces a voltage constraint projection function in the control strategy, adaptively constraining the load rate of the voltage amplitude considering the safe operation of the islanded microgrid to save control resources and energy consumption. The voltage deviation is corrected in real time so that the voltages of all distributed generators are always within a safe range, preventing equipment damage or system instability caused by excessive voltage deviation.

[0014] The present invention adopts a fully distributed architecture. Each generator can achieve global voltage consistency and reference value tracking only relying on local neighbor information, without the participation of a central controller, and the system has high reliability and strong scalability.

[0015] Advantages of additional aspects of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be learned through the practice of the present invention. Brief Description of the Drawings

[0016] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0017] Figure 1 It is a flowchart of the distributed secondary voltage control method for a microgrid based on voltage constraints in Embodiment 1 of the present invention; Figure 2 It is a block diagram of the microgrid system in Embodiment 1 of the present invention; Figure 3 It is a communication network topology diagram of the distributed generators in Embodiment 1 of the present invention; Figure 4 It is a diagram of the voltage amplitude change of the distributed generators in Embodiment 1 of the present invention; Figure 5 It is a diagram of the trigger time record of each distributed generator in Embodiment 1 of the present invention. Detailed Embodiment

[0018] It should be noted that the following detailed description is exemplary and is 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 one of ordinary skill in the technical field to which the present invention belongs.

[0019] It should be noted that the terms used herein are for the purpose of describing particular embodiments only 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 forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof. Embodiment 1: Embodiment 1 of the present invention provides a distributed secondary voltage control method for a microgrid based on voltage constraints, as Figure 1 shown, specifically including: establishing a secondary voltage control model for distributed generators, determining the communication topology structure, setting the reference value of the bus voltage and the voltage constraint range; designing an event trigger function and determining the corresponding event trigger mechanism, and triggering communication only when the voltage deviation exceeds the dynamic threshold; designing a voltage constraint projection scheme to project the voltage amplitude information of the distributed generators into the voltage constraint range; designing a distributed secondary voltage control strategy, and each generator executes the voltage control strategy based on its own voltage amplitude information and the voltage amplitude information from adjacent generators at the trigger moment within the triggered preset time interval, so as to realize event-triggered distributed secondary voltage control of the microgrid under voltage constraints. This embodiment reduces the communication times between distributed generators through the event trigger mechanism, reduces the communication cost, and can quickly stabilize the voltage under voltage constraints, improving the safety.

[0020] Specifically, it includes the following steps: Step 1: Obtain the data of the microgrid generators and establish a secondary voltage control model for the distributed generators.

[0021] Step 1.1: Obtain the data of the microgrid generators, including the self-voltage amplitude of the generators, the reference value of the bus voltage, and the voltage constraint range.

[0022] Step 1.2: Establish a secondary voltage control model for the distributed generators.

[0023] Step 1.2.1: Determine the communication topology structure between the distributed generators in the microgrid system to be controlled.

[0024] Obtain the actual structure of the microgrid system to be controlled, and simplify the microgrid system to be controlled to obtain the communication topology structure of the microgrid system to be controlled.

[0025] 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.

[0026] Step 1.2.2: Set the reference value of the bus voltage and the constraint range of the voltage, and establish a secondary voltage control model of the distributed generator according to the communication topology among the distributed generators.

[0027] In a specific implementation manner, considering a microgrid system composed of connected distributed generators, the reactive power-voltage droop control strategy of the microgrid is as follows: .

[0028] Wherein, , 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 the droop control, and are respectively the droop control coefficient and the reactive power of the i-th distributed generator.

[0029] The main objective of the secondary voltage control is to eliminate the voltage deviation caused by the droop control. Therefore, a voltage compensation amount is added to the voltage amplitude of the droop control, which is expressed as: .

[0030] Wherein, represents the change rate of the voltage amplitude of the droop control, represents the change rate of the reactive power of the generator, represents the change rate of the output voltage amplitude of the generator.

[0031] Then the secondary voltage control model of each distributed generator is as follows: .

[0032] Wherein, is the voltage compensation amount of the i-th distributed generator to be designed.

[0033] Step 2: Design an event-triggering function according to the continuous voltage amplitude information of the generator, and determine the corresponding event-triggering mechanism.

[0034] In a specific implementation manner, each distributed generator continuously monitors its own voltage amplitude information , and defines the state error and the event-triggering function as follows: , , .

[0035] Among them, is the state error, represents the most recent triggering moment of the i-th distributed generator before the current moment, is the voltage amplitude at the most recent triggering moment of the i-th distributed generator before the current moment t, is half of the voltage allowable deviation range, represents the Euclidean norm, represents the minimum value of the voltage constraint that satisfies the safe operation of the microgrid system, represents the maximum value of the 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, representing the initial sensitivity of the triggering communication of the i-th distributed generator, is a positive number, representing the attenuation rate of the triggering threshold of the i-th distributed generator, is 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 adjacent generators, is the current moment, at the current moment satisfies When the event triggering mechanism is satisfied, the distributed generator will send the current voltage amplitude information to adjacent generators, otherwise no communication will be carried out.

[0036] In this embodiment, the event triggering function is improved. This design ensures that when the voltage amplitude of the generator is close to the constraint boundary, the overall threshold decreases, thereby improving the triggering sensitivity, making it easier to trigger communication and correct voltage deviation; conversely, when the system voltage is at the center of the safe area, the triggering threshold is higher to avoid redundant communication. This method realizes the dynamic linkage adjustment of the event triggering mechanism and voltage safety constraints, has stronger system state perception ability and adaptability, and effectively improves the stability and communication efficiency of the microgrid control system.

[0037] Step 3: Design a voltage constraint projection scheme.

[0038] Specifically, considering the dynamic change of the load rate, the load rate adaptive constraint is imposed on the voltage amplitude, and the constraint projection function is used to project the voltage amplitude of the distributed generator into the voltage constraint range. The traditional fixed voltage constraint means that during the entire system operation, the allowable voltage fluctuation range is fixed. However, there are some disadvantages in this method at present. For example, in the case of high load, the fixed voltage constraint may not be able to effectively cope with the sudden increase in power demand, resulting in voltage fluctuations exceeding the allowable range, thus affecting the system stability; in the case of low load, the fixed voltage constraint may be too strict, leading to unnecessary energy consumption in voltage regulation.

[0039] Based on the defects of the above traditional method, this embodiment provides a load rate adaptive voltage constraint, which dynamically adjusts the allowable range of voltage according to the current load rate. For example, when the load rate is high, the allowable voltage fluctuation range is narrowed to ensure the stability of the system under high load; while when the load rate is low, the allowable voltage fluctuation range is widened to save control resources and energy consumption.

[0040] In a specific implementation manner, considering that the voltage amplitude of the distributed generator needs to meet certain constraint conditions to achieve the 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 as follows: , .

[0041] Among them, represents the minimum voltage constraint value that satisfies the safe operation of the microgrid system, represents the maximum voltage constraint value that satisfies the safe operation of the microgrid system, is the bus voltage reference value, is the reference deviation, represents the current load power of the microgrid system, represents the rated load power of the microgrid system.

[0042] Define the voltage constraint set as , and use the constraint projection function to project the voltage amplitude of the distributed generator into the voltage constraint range. The specific calculation method is as follows: .

[0043] Among them, R represents all real numbers, v represents the voltage value, represents the set of voltage amplitudes that satisfy the voltage constraint range, represents the minimum voltage constraint value that satisfies the safe operation of the microgrid system, represents the maximum voltage constraint value that satisfies the safe operation of the microgrid system, denotes the voltage amplitude of the i-th distributed generator, is a projection function, representing the voltage amplitude obtained by projecting the voltage amplitude of the i-th distributed generator onto the voltage constraint.

[0044] Step 4: Design a distributed secondary voltage controller based on the voltage constraint projection scheme, and use the distributed secondary voltage controller to perform secondary voltage control on the microgrid.

[0045] In a specific implementation, a distributed secondary voltage controller is designed. To achieve distributed secondary voltage control of the microgrid based on event-triggering under voltage constraints, each generator executes a voltage control protocol within a preset triggering time interval based on its own voltage information and the voltage information of adjacent generators at the triggering moment: .

[0046] Among them, is the voltage compensation amount of the i-th distributed generator to be designed. When , is the communication connection coefficient of the communication network topology of the distributed generators, representing the communication relationship between the i-th distributed generator and the j-th distributed generator. When information can be communicated and transmitted between the i-th distributed generator and the j-th distributed generator, , otherwise . When , it is defined that , that is, it is defined that a generator cannot transmit information to itself. is the set of adjacent generators that can communicate with the distributed generator i. is the voltage amplitude of the j-th 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 information. Otherwise, this distributed generator cannot obtain the bus voltage reference value. In the present invention, it is agreed that at least one distributed generator can obtain the bus reference voltage information; is a positive number, representing the gain of the constraint projection term, and a relatively high value can be appropriately set to ensure that the voltage change range is within the voltage constraint range; represents the voltage amplitude obtained by projecting the voltage amplitude of the i-th distributed generator at the most recent triggering moment before the current moment t onto the voltage constraint.

[0047] The first term on the right side of the above control protocol is used to drive the voltage amplitudes of the distributed generators to tend to be consistent; the second term is used to drive the voltage amplitudes of the distributed generators to track the bus reference voltage; the third term It is used to correct the voltage amplitude of distributed generators into the voltage constraint interval through constrained projection.

[0048] To verify the effectiveness of the method of this embodiment, a simulation experiment was carried out. Considering an island microgrid system containing four distributed generators, as Figure 2 shown, the microgrid system of this embodiment includes four distributed generators and their connection lines. The four distributed generators are respectively distributed generator 1 (DG1), distributed generator 2 (DG2), distributed generator 3 (DG3) and distributed generator 4 (DG4), which are respectively connected to load 1, load 2, load 3, and load 4. Distributed generator 1 is connected to distributed generator 2 through line impedance 1, distributed generator 3 and distributed generator 4 are connected through line impedance 3, and distributed generator 2 and distributed generator 3 are connected through line impedance 2. It is set that distributed generator 2 can obtain the bus voltage reference value information.

[0049] This embodiment takes a microgrid system composed of 4 distributed generators as an example for illustration. In some other embodiments, the number of distributed generators can be set according to the actual situation.

[0050] Figure 3 It represents the communication topology structure among the four distributed generators. Among them, it is set that distributed generator 2 can obtain the bus voltage reference value information. Among them, is the bus voltage. The reference value of the bus voltage is set to 220V, the reference deviation is set to 10V, the rated load power of the microgrid system is 100kW. At the initial moment, the load power of the microgrid system is 50kW. At this time, the voltage constraint range is 220V±5V, and 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, then the voltage constraint range becomes 220V±2V. The voltage amplitude changes of all distributed generators are as Figure 4 shown. The dotted line represents the bus voltage reference value. It can be seen that the voltage amplitudes of all distributed generators are quickly corrected into the voltage constraint interval, and can also make a rapid response after the voltage constraint range changes, correct the voltage amplitude into the voltage constraint interval, and tend to be consistent with the bus voltage reference value within the voltage constraint range, avoiding voltage over-limit and effectively ensuring the safe operation of the microgrid; Figure 5 records the communication trigger moments of the four distributed generators. In the figure, " The abscissa of " is the triggering moment of the distributed generator. It can be seen that when the voltage amplitude of the generator approaches the constraint boundary, the overall control effect is achieved through more communication. After reaching stability, the communication between distributed generators significantly decreases. The communication between distributed generators is discrete, significantly reducing the number of communication times and the communication cost.

[0051] Embodiment 2: Embodiment 2 of the present invention provides a distributed secondary voltage control system for a microgrid based on voltage constraints, including: A data acquisition module, configured to acquire data of the microgrid generator and establish a secondary voltage control model for the distributed generator; A trigger mechanism setting module, configured to design an event trigger function according to the continuous voltage amplitude information of the generator and determine the corresponding event trigger mechanism; A voltage constraint design module, configured to design a voltage constraint projection scheme. Specifically, considering the dynamic change of the load rate, the load rate adaptive constraint is imposed on the voltage amplitude, and the voltage amplitude of the distributed generator is projected into the range of voltage constraints by using a constraint projection function; A controller control module, configured to construct a distributed secondary voltage controller based on the voltage constraint projection scheme and use the distributed secondary voltage controller to perform secondary voltage control on the microgrid.

[0052] Embodiment 3: Embodiment 3 of the present invention provides a medium on which a program is stored, and when the program is executed by a processor, it implements the steps in the method for distributed secondary voltage control of a microgrid based on voltage constraints as described in Embodiment 1 of the present invention.

[0053] Embodiment 4: Embodiment 4 of the present invention provides a device, including a memory, a processor, and a program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps in the method for distributed secondary voltage control of a microgrid based on voltage constraints as described in Embodiment 1 of the present invention.

[0054] Embodiment 5: Embodiment 5 of the present invention provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the steps in the method for distributed secondary voltage control of a microgrid based on voltage constraints as described in Embodiment 1 of the present invention.

[0055] The steps involved in Embodiments 2, 3, 4, and 5 above correspond to those in Method Embodiment 1. For specific implementation manners, reference may be made to the relevant description part of Embodiment 1.

[0056] Those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented by a general-purpose computer device. Optionally, they can be implemented by program codes executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them 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.

[0057] Although the specific implementation manners of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present invention.

Claims

1. A distributed secondary voltage control method for a microgrid based on voltage constraints, characterized in that Including the following steps: Obtain the data of the microgrid generator and establish a secondary voltage control model for the distributed generator; Design an event-triggering function based on the continuous voltage amplitude information of the generator and determine the corresponding event-triggering mechanism; Design a voltage constraint projection scheme. Specifically, consider the dynamic change of the load rate to perform load rate adaptive constraint on the voltage amplitude, and use a constraint projection function to project the voltage amplitude of the distributed generator into the range of voltage constraints; Design a distributed secondary voltage controller based on the voltage constraint projection scheme, and use the distributed secondary voltage controller to perform secondary voltage control on the microgrid.

2. The distributed secondary voltage control method for a microgrid based on voltage constraint according to claim 1, characterized in that The specific steps for establishing the secondary voltage control model of the distributed generator are as follows: Determine the communication topology among the distributed generators in the microgrid system to be controlled; Set the reference value of the bus voltage and the range of voltage constraints, and establish a secondary voltage control model for the distributed generator according to the communication topology among the distributed generators.

3. The distributed secondary voltage control method for a microgrid based on voltage constraint according to claim 1, characterized in that, The event-triggering function is: ， ， ， wherein, is the state error, represents the most recent triggering moment of the i-th distributed generator before the current moment, is the voltage amplitude at the most recent triggering moment of the i-th distributed generator before the current moment t, is half of the voltage allowable deviation range, represents the Euclidean norm, represents the minimum value of the voltage constraint for ensuring the safe operation of the microgrid system, represents the maximum value of the voltage constraint for ensuring 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, representing the initial sensitivity of the triggering communication of the i-th distributed generator, is a positive number, representing the attenuation rate of the triggering threshold of the i-th distributed generator, is a small positive number to avoid a zero denominator; and the first triggering moment is set as the initial moment , at the initial moment, all distributed generators transmit the current voltage amplitude to adjacent generators, is the current moment, at the current moment satisfies When the event triggering mechanism is satisfied, the distributed generator sends the current voltage amplitude information to adjacent generators, otherwise no communication is performed.

4. The distributed secondary voltage control method for a microgrid based on voltage constraint according to claim 1, wherein Define the voltage constraint as: ， wherein, \(R\) represents all real numbers, and \(v\) represents the voltage value, represents the set of voltage amplitudes that satisfy the voltage constraints, represents the minimum voltage constraint for the safe operation of the microgrid system, represents the maximum voltage constraint for the safe operation of the microgrid system.

5. The distributed secondary voltage control method for a microgrid based on voltage constraint according to claim 4, wherein Use a constraint projection function to project the voltage amplitude of the distributed generator into the range of voltage constraints. The specific calculation method is: ， Among them, represents the voltage amplitude of the i-th distributed generator, is a projection function, representing the voltage amplitude obtained by projecting the voltage amplitude of the i-th distributed generator onto the voltage constraint.

6. The distributed secondary voltage control method for a microgrid based on voltage constraint according to claim 1, wherein The voltage control protocol of the distributed secondary voltage controller is: ， wherein, is the voltage compensation amount of the i-th distributed generator to be designed. When time, is the communication connection coefficient of the communication network topology of the distributed generator, representing the communication relationship between the i-th distributed generator and the j-th distributed generator. When information is communicated between the i-th distributed generator and the j-th distributed generator, , otherwise . When , it is defined that that is, it is defined that the generator cannot transmit information with itself, is the set of adjacent generators that can communicate with the distributed generator i, is the voltage amplitude of the j-th distributed generator at the most recent trigger time before the current time 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 obtains the bus reference value information. Otherwise, the distributed generator cannot obtain the bus voltage reference value, and at least one distributed generator obtains the bus reference voltage information; is a positive number, representing the gain of the constraint projection term; represents the voltage amplitude of the voltage amplitude of the i-th distributed generator at the most recent trigger time before the current time t projected onto the voltage constraint.

7. A distributed secondary voltage control system for a microgrid based on voltage constraints, characterized in that, Including: A data acquisition module configured to obtain the data of the microgrid generator and establish a secondary voltage control model for the distributed generator; A trigger mechanism setting module configured to design an event-triggering function based on the continuous voltage amplitude information of the generator and determine the corresponding event-triggering mechanism; A voltage constraint design module configured to design a voltage constraint projection scheme. Specifically, consider the dynamic change of the load rate to perform load rate adaptive constraint on the voltage amplitude, and use a constraint projection function to project the voltage amplitude of the distributed generator into the range of voltage constraints; A controller control module configured to construct a distributed secondary voltage controller based on the voltage constraint projection scheme and use the distributed secondary voltage controller to perform secondary voltage control on the microgrid.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the voltage-constraint-based microgrid distributed secondary voltage control method according to any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, Among them, multiple instructions are stored, and the instructions are suitable for being loaded and executed by the processor of the terminal device to implement the voltage-constraint-based microgrid distributed secondary voltage control method according to any one of claims 1-6.

10. A terminal device, characterized in that, Including a processor and a computer-readable storage medium. The processor is used to implement each instruction; the computer-readable storage medium is used to store multiple instructions, and the instructions are suitable for being loaded and executed by the processor to implement the voltage-constraint-based microgrid distributed secondary voltage control method according to any one of claims 1-6.

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