Intelligent power distribution network monitoring method and system based on multi-source data fusion

Abstract

The invention discloses an intelligent power distribution network monitoring method and system based on multi-source data fusion, and relates to the technical field of intelligent power distribution network monitoring, and the method comprises the following steps: S1, carrying out the business data encryption of an intelligent fusion terminal; s2, monitoring the load change of a power system of the power grid dispatching master station in real time through AGC, and enabling the intelligent fusion terminal to automatically receive and execute active and reactive power control instructions sent by the power grid dispatching master station; s3, monitoring the voltage level of a power system of the power grid dispatching master station in real time through AVC, and enabling the intelligent fusion terminal to automatically receive and execute voltage and reactive power regulation instructions sent by the power grid dispatching master station; and S4, the battery management system monitors the inverter connected to the network in real time by calling an API interface, and the fusion intelligent terminal automatically receives and executes an energy storage output adjustment instruction sent by the power grid dispatching master station. According to the invention, flexible control of the distributed photovoltaic terminal is realized by adopting a multi-fusion automatic communication technology and an artificial intelligence technology.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent distribution network monitoring, and in particular to an intelligent distribution network monitoring method and system based on multi-source data fusion. Background Art

[0002] Compared with centralized photovoltaic power stations, distributed photovoltaic power stations have obvious advantages. Distributed photovoltaic power stations can generate electricity, connect to the grid and use electricity nearby, which effectively solves the problem of power loss during voltage boosting and long-distance transmission. With the massive access of distributed photovoltaic power to the power grid, due to its unique randomness, volatility, uncontrollability and the inability to break through the upper and lower limits of resources for direct regulation, a large number of transparent network channels are directly connected to the power grid production area, which aggravates the difficulty of automatic management of distribution network dispatching and network risks. At the same time, the administrative construction requirements of distributed photovoltaic power in some areas and some disorderly investment and construction have led to the fact that the installed capacity of distributed photovoltaic power in some areas has exceeded the current load of the substation, greatly increasing the risk of power grid management and control. The research and application of key technologies for distributed photovoltaic access intelligent fusion terminals in distribution networks based on multi-technology integration applications is aimed at the operation scenarios where distributed energy is accessed to distribution networks in large quantities. There is an urgent need to carry out relevant research to address the problems such as the lack of reliable monitoring methods for active distribution networks, significant changes in distribution network currents and short-circuit current distribution, which affects the voltage stability of distribution lines, and the safety hazards brought to distribution networks by multi-directional current operation modes. Summary of the invention

[0003] The purpose of the present invention is to provide a smart distribution network monitoring method and system based on multi-source data fusion to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a smart distribution network monitoring method based on multi-source data fusion, comprising the following steps: S1. The intelligent fusion terminal integrates the functions of 5G communication terminal, vertical encryption, telemotor, AGC and AVC control. In network communication technology, the business data of the intelligent fusion terminal is encrypted to ensure a secure connection between the distributed photovoltaic control terminal and the power grid dispatching master station network; S2. Use AGC to monitor the load changes of the power system of the power grid dispatching master station in real time, so that the intelligent fusion terminal automatically receives and executes the active and reactive power control instructions sent by the power grid dispatching master station, controls the power output of the distribution network station according to the state strategy, ensures that the maximum active power value and active power change value of the distribution network station do not exceed the given value of the power grid dispatching master station, and transmits the system operation adjustment status and related parameter information of the distribution network station to the power grid dispatching master station; S3, through AVC real-time monitoring of the voltage level of the power system of the power grid dispatching master station, so that the intelligent fusion terminal automatically receives and executes the voltage and reactive power adjustment instructions sent by the power grid dispatching master station, collects the real-time information and operating status of the grid connection point, inverter, and reactive power compensation device, calculates the target value and distributes the target instruction to the inverter and reactive power compensation device, and realizes the reactive power and voltage control function of the power grid; S4. The battery management system monitors the operating status, charging and discharging time, battery pack output, and voltage and power regulation of the inverter connected to the network in real time by calling the API interface, so that the integrated intelligent terminal automatically receives and executes the energy storage output adjustment instructions sent by the power grid dispatching master station.

[0005] Preferably, in step S1, the intelligent fusion terminal uses the network layer TSL encryption algorithm, the SM2 national secret asymmetric encryption algorithm and the State Grid Zhixin SC1161Y encryption chip to encrypt business data; The intelligent fusion terminal is an integrated acquisition and communication device with multiple devices in one. It has a built-in 5G communication module and a vertical encryption module. It also has 5G communication, data encryption, telecontrol transmission, AGC and AVC functions. It realizes the integration of multiple services in one device and improves the quality and efficiency of maintenance work. The intelligent fusion terminal is applied to distributed photovoltaics of 10 kV and above, and is connected to the power grid dispatching main station in a direct procurement manner. It also has the function of automatic voltage and power control, realizing rigid control of one-button disconnection of distributed power sources in emergency situations such as faults and heavy overloads, as well as flexible regulation of active power, reactive power and voltage.

[0006] Preferably, in step S2, the state strategy includes the following steps: S210, when the grid dispatching master station issues a local control mode, that is, when the master station configuration is equal to 0, all inverters are set to full power state; S220, writing the maximum power generation capacity into the power generation power of all inverters to ensure that the inverter power regulator tracks the full power generation; S230: If there is a full-power control command word, the control command word is set to be uncontrollable, and the inverter power regulator tracks the full power.

[0007] Preferably, the step S3 specifically includes the following steps: S310, AVC monitors the voltage of the grid connection point in real time. When the intelligent fusion terminal receives the target instruction issued by the power grid dispatching master station, it calculates the difference between the target value and the real-time value of the voltage of the grid connection point; S320: If the difference is within the dead zone, proceed to step S310 to continue real-time monitoring of the real-time value and receiving the target value under the target instruction; if the difference is not within the dead zone, proceed to step S330 to maintain the stability of the voltage and reactive power at the grid connection point; S330, converting the voltage into reactive power, and then calculating and allocating the adjustment according to the target instruction, calculating the reactive power target value of each inverter and reactive compensation device after comprehensively considering the topological relationship, the devices not involved in the adjustment and various constraints, issuing control instructions, and collecting the reactive power and voltage data of the grid connection point in real time, issuing the reactive power target value to the inverter and reactive compensation device, and forming a closed-loop control; S340, monitor the grid connection point voltage in real time according to the adjustment period, calculate the difference between the target value and the real-time value of the grid connection point voltage, if the difference is within the adjustment dead zone, proceed to step S310 and execute again, if the difference is not within the adjustment dead zone, directly execute step S350; S350, fine-tune the voltage, calculate the fine-tune target value, and proceed to step S330 to calculate the distribution adjustment.

[0008] Preferably, in step S330, the closed-loop control process is as follows: S331. If the target value is voltage, convert the voltage target value into a reactive power target value according to the system impedance; S332, deriving the devices that participate in and do not participate in AVC regulation according to the communication status, and deriving the reactive power target value that needs to be regulated by AVC; S333, calculating the target reactive power value of the inverter and the reactive power compensation device according to the allocation strategy and reactive power regulation constraints; S334, forming a control instruction and sending it to each device; S335. Real-time sampling of reactive power of each device, grid connection point voltage and reactive power data to form a closed-loop control.

[0009] Preferably, in step S333, the reactive power value allocation strategy includes four allocation modes, namely, only adjusting the inverter mode, only adjusting the reactive compensation device mode, preferentially adjusting the inverter mode, and preferentially adjusting the reactive compensation device mode; The inverter-only regulation mode means that the system reactive power target command is only allocated to the inverter for control; The reactive power compensation equipment adjustment only mode means that the on-site reactive power target command is only allocated to the reactive power compensation equipment for control; The inverter priority adjustment mode means that after using this mode, AVC first adjusts the adjustable inverter. After the inverter is adjusted to the target value, if the total target value has been reached, the adjustment is ended. If the total target value has not been reached, the adjustable reactive power compensation device is adjusted. The priority reactive compensation device adjustment mode means that after using this method, the adjustable reactive compensation device is adjusted first during AVC adjustment. After the reactive compensation device is adjusted to the target value, if the total target value has been reached, the adjustment is terminated. If the total target value has not been reached, the adjustable inverter is adjusted. In this mode, after the reactive power reaches the target, the reactive power replacement mode is entered, and the reactive power emitted by the reactive compensation device is gradually transferred to the inverter, so that the reactive compensation device maintains a certain reactive power margin, which is conducive to the next rapid adjustment.

[0010] Preferably, in step S333, the reactive power regulation constraint condition is as follows: a. When the communication with the dispatch is interrupted or the dispatch instruction is not received within the time limit, an alarm is issued, and the current value can be continued, the local target value can be switched, or the lock can be set; b. If the communication with the grid connection point is interrupted, the AVC regulation function will be immediately locked; c. The inverter sends out abnormal or shutdown signals, and the regulating function of the unit is immediately locked; d. The reactive power compensation equipment sends out an abnormal or shutdown signal, locking the regulating function of the reactive power compensation equipment.

[0011] A smart distribution network monitoring system based on multi-source data fusion, comprising: An intelligent fusion unit, which enables the intelligent fusion terminal to integrate the functions of 5G communication terminal, vertical encryption, telemotor, AGC, and AVC control, and enables a secure connection between the distributed photovoltaic control terminal and the power grid dispatching master station network through business data encryption; A power control unit, which monitors the load changes of the power system of the power grid dispatching master station in real time through the AGC, so that the intelligent fusion terminal automatically receives and executes the active and reactive power control instructions sent by the power grid dispatching master station, controls the power output of the distribution network station, and ensures that the maximum active power value and active power change value of the distribution network station do not exceed the given value of the power grid dispatching master station; A voltage control unit, which monitors the voltage level of the power system of the power grid dispatching master station in real time through AVC, enables the intelligent fusion terminal to automatically receive and execute the voltage and reactive power adjustment instructions sent by the power grid dispatching master station, collects the real-time information and operating status of the grid connection point, inverter, and reactive power compensation device, calculates the target value and distributes the target instruction to the inverter and reactive power compensation device; The battery management unit monitors the operating status, charging and discharging time, battery pack output, and voltage and power regulation of the inverter connected to the network in real time by calling the API interface of the battery management system, so that the integrated intelligent terminal automatically receives and executes the energy storage output regulation instructions sent by the power grid dispatching master station.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts multi-integrated automated communication technology and artificial intelligence technology to realize flexible control of distributed photovoltaic terminals. Through the integrated development based on TSL, SM2 asymmetric algorithm and State Grid Zhixin encryption chip, the distributed photovoltaic management and control terminal and the distribution network master station network security connection is realized, which can effectively avoid malicious attacks such as data hijacking, tampering and redirection; 2. The present invention develops the AGC automatic power control function to enable the fusion intelligent terminal to automatically receive and execute the active and reactive power control instructions sent by the dispatching master station, and develops the AVC automatic voltage control function to enable the fusion intelligent terminal to automatically receive and execute the voltage and reactive power adjustment instructions sent by the dispatching master station; 3. The present invention develops an API interface with the BMS battery management system to enable the integrated intelligent terminal to automatically receive and execute the energy storage output adjustment instructions sent by the dispatching master station. By adopting an intelligent integrated terminal that integrates the functions of 5G communication terminal, vertical encryption, remote motor and AGC, AVC control, it realizes the integration of multiple services and improves the quality and efficiency of maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the overall method provided by an embodiment of the present invention; Figure 2 A schematic diagram of the overall system flow provided by an embodiment of the present invention; Figure 3 A schematic flow chart of the steps of calculating allocation adjustment provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figures 1 to 3 The present invention provides a technical solution: a smart distribution network monitoring method based on multi-source data fusion, comprising the following steps: S1. The intelligent fusion terminal integrates the functions of 5G communication terminal, vertical encryption, telemotor, AGC and AVC control. In network communication technology, the business data of the intelligent fusion terminal is encrypted to ensure a secure connection between the distributed photovoltaic control terminal and the power grid dispatching master station network; S2. Use AGC to monitor the load changes of the power system of the power grid dispatching master station in real time, so that the intelligent fusion terminal automatically receives and executes the active and reactive power control instructions sent by the power grid dispatching master station, controls the power output of the distribution network station according to the state strategy, ensures that the maximum active power value and active power change value of the distribution network station do not exceed the given value of the power grid dispatching master station, and transmits the system operation adjustment status and related parameter information of the distribution network station to the power grid dispatching master station; S3, through AVC real-time monitoring of the voltage level of the power system of the power grid dispatching master station, so that the intelligent fusion terminal automatically receives and executes the voltage and reactive power adjustment instructions sent by the power grid dispatching master station, collects the real-time information and operating status of the grid connection point, inverter, and reactive power compensation device, calculates the target value and distributes the target instruction to the inverter and reactive power compensation device, and realizes the reactive power and voltage control function of the power grid; S4. The battery management system monitors the operating status, charging and discharging time, battery pack output, and voltage and power regulation of the inverter connected to the network in real time by calling the API interface, so that the integrated intelligent terminal automatically receives and executes the energy storage output adjustment instructions sent by the power grid dispatching master station.

[0016] In step S1, the intelligent fusion terminal uses the network layer TSL encryption algorithm, the SM2 national secret asymmetric encryption algorithm and the State Grid Zhixin SC1161Y encryption chip to encrypt business data; The intelligent fusion terminal is an integrated acquisition and communication device with multiple devices in one. It has a built-in 5G communication module and a vertical encryption module. It also has 5G communication, data encryption, telecontrol transmission, AGC and AVC functions. It realizes the integration of multiple services in one device and improves the quality and efficiency of maintenance work. The intelligent fusion terminal is applied to distributed photovoltaic power generation of 10 kV and above, and is connected to the main grid dispatching station in a direct procurement mode. It also has the functions of automatic voltage and power control, realizing rigid control of one-button removal of distributed power sources in emergency situations such as faults and heavy overloads, as well as flexible regulation of active power, reactive power and voltage. In step S2, the state strategy includes the following steps: S210, when the grid dispatching master station issues a local control mode, that is, when the master station configuration is equal to 0, all inverters are set to full power state; S220, writing the maximum power generation capacity into the power generation power of all inverters to ensure that the inverter power regulator tracks the full power generation; S230, if there is a full-power control command word, the control command word is set to be uncontrollable, and the inverter power regulator tracks the full power; Step S3 specifically includes the following steps: S310, AVC monitors the voltage of the grid connection point in real time. When the intelligent fusion terminal receives the target instruction issued by the power grid dispatching master station, it calculates the difference between the target value and the real-time value of the voltage of the grid connection point; S320: If the difference is within the dead zone, proceed to step S310 to continue real-time monitoring of the real-time value and receiving the target value under the target instruction; if the difference is not within the dead zone, proceed to step S330 to maintain the stability of the voltage and reactive power at the grid connection point; S330, converting the voltage into reactive power, and then calculating and allocating the adjustment according to the target instruction, calculating the reactive power target value of each inverter and reactive compensation device after comprehensively considering the topological relationship, the devices not involved in the adjustment and various constraints, issuing control instructions, and collecting the reactive power and voltage data of the grid connection point in real time, issuing the reactive power target value to the inverter and reactive compensation device, and forming a closed-loop control; S340, monitor the grid connection point voltage in real time according to the adjustment period, calculate the difference between the target value and the real-time value of the grid connection point voltage, if the difference is within the adjustment dead zone, proceed to step S310 and execute again, if the difference is not within the adjustment dead zone, directly execute step S350; S350, fine-tune the voltage, calculate the fine-tune target value, and proceed to step S330 to calculate the distribution adjustment; In step S330, the closed-loop control process is as follows: S331. If the target value is voltage, convert the voltage target value into a reactive power target value according to the system impedance; S332, deriving the devices that participate in and do not participate in AVC regulation according to the communication status, and deriving the reactive power target value that needs to be regulated by AVC; S333, calculating the target reactive power value of the inverter and the reactive power compensation device according to the allocation strategy and reactive power regulation constraints; S334, forming a control instruction and sending it to each device; S335, real-time sampling of reactive power, grid connection point voltage and reactive power data of each device to form a closed-loop control; In step S333, the reactive power value allocation strategy includes four allocation modes, namely, only adjusting the inverter mode, only adjusting the reactive compensation device mode, prioritizing the inverter mode, and prioritizing the reactive compensation device mode; The inverter-only regulation mode means that the system reactive power target command is only allocated to the inverter for control; The reactive power compensation equipment adjustment only mode means that the on-site reactive power target command is only allocated to the reactive power compensation equipment for control; The inverter priority adjustment mode means that after using this mode, AVC first adjusts the adjustable inverter. After the inverter is adjusted to the target value, if the total target value has been reached, the adjustment is ended. If the total target value has not been reached, the adjustable reactive power compensation equipment is adjusted. Prioritizing reactive power compensation device adjustment mode means that after using this mode, the adjustable reactive power compensation device is adjusted first during AVC adjustment. After the reactive power compensation device is adjusted to the target value, if the total target value has been reached, the adjustment is terminated. If the total target value has not been reached, the adjustable inverter is adjusted. In this mode, after the reactive power reaches the target, the reactive power replacement mode is entered, and the reactive power generated by the reactive power compensation device is gradually transferred to the inverter, so that the reactive power compensation device maintains a certain reactive power margin, which is conducive to the next rapid adjustment. In step S333, the reactive power regulation constraint conditions are as follows: a. When the communication with the dispatch is interrupted or the dispatch instruction is not received within the time limit, an alarm is issued, and the current value can be continued, the local target value can be switched, or the lock can be set; b. If the communication with the grid connection point is interrupted, the AVC regulation function will be immediately locked; c. The inverter sends out abnormal or shutdown signals, and the regulating function of the unit is immediately locked; d. The reactive power compensation equipment sends out abnormal or shutdown signals, blocking the regulation function of the reactive power compensation equipment; The reactive power reserve margin verification method is adopted to ensure that each area can independently adjust reactive power locally. The method formula is: ; In the formula, is the electric coupling strength matrix, For two nodes , The power transfer capacity between For two nodes , The equivalent impedance between For transmission lines The power value transmission distribution factor on the node indicates that the unit power is transmitted from the node Inflow from the node Outflow transmission line The power change on For transmission lines The power value limit on The impedance matrix Line The elements of the column, Indicates the total number of lines. The impedance matrix Line The elements of the column, The impedance matrix Line The elements of the column, Indicates the transmission line number, represents the minimum value function, Indicates taking the absolute value; A smart distribution network monitoring system based on multi-source data fusion, comprising: An intelligent fusion unit, which enables the intelligent fusion terminal to integrate the functions of 5G communication terminal, vertical encryption, telemotor, AGC, and AVC control, and enables a secure connection between the distributed photovoltaic control terminal and the power grid dispatching master station network through business data encryption; A power control unit, which monitors the load changes of the power system of the power grid dispatching master station in real time through the AGC, so that the intelligent fusion terminal automatically receives and executes the active and reactive power control instructions sent by the power grid dispatching master station, controls the power output of the distribution network station, and ensures that the maximum active power value and active power change value of the distribution network station do not exceed the given value of the power grid dispatching master station; A voltage control unit, which monitors the voltage level of the power system of the power grid dispatching master station in real time through AVC, enables the intelligent fusion terminal to automatically receive and execute the voltage and reactive power adjustment instructions sent by the power grid dispatching master station, collects the real-time information and operating status of the grid connection point, inverter, and reactive power compensation device, calculates the target value and distributes the target instruction to the inverter and reactive power compensation device, and realizes the reactive power and voltage control functions of the power grid; The battery management unit monitors the operating status, charging and discharging time, battery pack output, and voltage and power regulation of the inverter connected to the network in real time by calling the API interface of the battery management system, so that the integrated intelligent terminal automatically receives and executes the energy storage output regulation instructions sent by the power grid dispatching master station.

[0017] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A smart distribution network monitoring method based on multi-source data fusion, characterized in that: The method comprises the following steps: S1. The intelligent fusion terminal integrates the functions of 5G communication terminal, vertical encryption, telemotor, AGC and AVC control. In network communication technology, the business data of the intelligent fusion terminal is encrypted to ensure a secure connection between the distributed photovoltaic control terminal and the power grid dispatching master station network; S2. Use AGC to monitor the load changes of the power system of the power grid dispatching master station in real time, so that the intelligent fusion terminal automatically receives and executes the active and reactive power control instructions sent by the power grid dispatching master station, controls the power output of the distribution network station according to the state strategy, ensures that the maximum active power value and active power change value of the distribution network station do not exceed the given value of the power grid dispatching master station, and transmits the system operation adjustment status and related parameter information of the distribution network station to the power grid dispatching master station; S3, through AVC real-time monitoring of the voltage level of the power system of the power grid dispatching master station, so that the intelligent fusion terminal automatically receives and executes the voltage and reactive power adjustment instructions sent by the power grid dispatching master station, collects the real-time information and operating status of the grid connection point, inverter, and reactive power compensation device, calculates the target value and distributes the target instruction to the inverter and reactive power compensation device, and realizes the reactive power and voltage control function of the power grid; S4. The battery management system monitors the operating status, charging and discharging time, battery pack output, and voltage and power regulation of the inverter connected to the network in real time by calling the API interface, so that the integrated intelligent terminal automatically receives and executes the energy storage output adjustment instructions sent by the power grid dispatching master station.

2. According to claim 1, a smart distribution network monitoring method based on multi-source data fusion is characterized in that: In step S1, the intelligent fusion terminal uses the network layer TSL encryption algorithm, the SM2 national secret asymmetric encryption algorithm and the State Grid Zhixin SC1161Y encryption chip to encrypt business data; The intelligent fusion terminal is an integrated data acquisition and communication device with multiple devices in one. It has a built-in 5G communication module and a vertical encryption module. It also has 5G communication, data encryption, telecontrol transmission, AGC and AVC functions. The intelligent fusion terminal is applied to distributed photovoltaics of 10 kV and above, and is connected to the power grid dispatching main station in a direct procurement manner. It also has the function of automatic voltage and power control, realizing rigid control of one-button disconnection of distributed power sources in emergency situations such as faults and heavy overloads, as well as flexible regulation of active power, reactive power and voltage.

3. The method for monitoring a smart distribution network based on multi-source data fusion according to claim 1, characterized in that: In step S2, the state strategy includes the following steps: S210, when the grid dispatching master station issues a local control mode, that is, when the master station configuration is equal to 0, all inverters are set to full power state; S220, writing the maximum power generation capacity into the power generation power of all inverters to ensure that the inverter power regulator tracks the full power generation; S230: If there is a full-power control command word, the control command word is set to be uncontrollable, and the inverter power regulator tracks the full power.

4. The method for monitoring a smart distribution network based on multi-source data fusion according to claim 1, characterized in that: The step S3 specifically comprises the following steps: S310, AVC monitors the voltage of the grid connection point in real time. When the intelligent fusion terminal receives the target instruction issued by the power grid dispatching master station, it calculates the difference between the target value and the real-time value of the voltage of the grid connection point; S320: If the difference is within the dead zone, proceed to step S310 to continue real-time monitoring of the real-time value and receiving the target value under the target instruction; if the difference is not within the dead zone, proceed to step S330 to maintain the stability of the voltage and reactive power at the grid connection point; S330, converting the voltage into reactive power, and then calculating and allocating the adjustment according to the target instruction, calculating the reactive power target value of each inverter and reactive compensation device after comprehensively considering the topological relationship, the devices not involved in the adjustment and various constraints, issuing control instructions, and collecting the reactive power and voltage data of the grid connection point in real time, issuing the reactive power target value to the inverter and reactive compensation device, and forming a closed-loop control; S340, monitor the grid connection point voltage in real time according to the adjustment period, calculate the difference between the target value and the real-time value of the grid connection point voltage, if the difference is within the adjustment dead zone, proceed to step S310 and execute again, if the difference is not within the adjustment dead zone, directly execute step S350; S350, fine-tune the voltage, calculate the fine-tune target value, and proceed to step S330 to calculate the distribution adjustment.

5. The method for monitoring a smart distribution network based on multi-source data fusion according to claim 4 is characterized in that: In step S330, the closed-loop control process is as follows: S331. If the target value is voltage, convert the voltage target value into a reactive power target value according to the system impedance; S332, deriving the devices that participate in and do not participate in AVC regulation according to the communication status, and deriving the reactive power target value that needs to be regulated by AVC; S333, calculating the target reactive power value of the inverter and the reactive power compensation device according to the allocation strategy and reactive power regulation constraints; S334, forming a control instruction and sending it to each device; S335. Real-time sampling of reactive power of each device, grid connection point voltage and reactive power data to form a closed-loop control.

6. The method for monitoring a smart distribution network based on multi-source data fusion according to claim 5 is characterized in that: In the step S333, the reactive power value allocation strategy includes four allocation modes, namely, only adjusting the inverter mode, only adjusting the reactive compensation device mode, preferentially adjusting the inverter mode, and preferentially adjusting the reactive compensation device mode; The inverter-only regulation mode means that the system reactive power target command is only allocated to the inverter for control; The reactive power compensation equipment adjustment only mode means that the on-site reactive power target command is only allocated to the reactive power compensation equipment for control; The inverter priority adjustment mode means that after using this mode, AVC first adjusts the adjustable inverter. After the inverter is adjusted to the target value, if the total target value has been reached, the adjustment is ended. If the total target value has not been reached, the adjustable reactive power compensation device is adjusted. The priority reactive compensation device adjustment mode means that after using this method, the adjustable reactive compensation device is adjusted first during AVC adjustment. After the reactive compensation device is adjusted to the target value, if the total target value has been reached, the adjustment is terminated. If the total target value has not been reached, the adjustable inverter is adjusted. In this mode, after the reactive power reaches the target, the reactive power replacement mode is entered, and the reactive power emitted by the reactive compensation device is gradually transferred to the inverter, so that the reactive compensation device maintains a certain reactive power margin, which is conducive to the next rapid adjustment.

7. The method for monitoring a smart distribution network based on multi-source data fusion according to claim 5 is characterized in that: In step S333, the reactive power regulation constraint condition is as follows: a. When the communication with the dispatch is interrupted or the dispatch instruction is not received within the time limit, an alarm is issued, and the current value can be continued, the local target value can be switched, or the lock can be set; b. If the communication with the grid connection point is interrupted, the AVC regulation function will be immediately locked; c. The inverter sends out abnormal or shutdown signals, and the regulating function of the unit is immediately locked; d. The reactive power compensation equipment sends out an abnormal or shutdown signal, locking the regulating function of the reactive power compensation equipment.

8. An intelligent distribution network monitoring system based on multi-source data fusion, characterized in that: The smart distribution network monitoring system is applicable to a smart distribution network monitoring method based on multi-source data fusion as described in any one of claims 1 to 7, comprising: An intelligent fusion unit, which enables the intelligent fusion terminal to integrate the functions of 5G communication terminal, vertical encryption, telemotor, AGC, and AVC control, and enables a secure connection between the distributed photovoltaic control terminal and the power grid dispatching master station network through business data encryption; A power control unit, which monitors the load changes of the power system of the power grid dispatching master station in real time through the AGC, so that the intelligent fusion terminal automatically receives and executes the active and reactive power control instructions sent by the power grid dispatching master station, controls the power output of the distribution network station, and ensures that the maximum active power value and active power change value of the distribution network station do not exceed the given value of the power grid dispatching master station; A voltage control unit, which monitors the voltage level of the power system of the power grid dispatching master station in real time through AVC, enables the intelligent fusion terminal to automatically receive and execute the voltage and reactive power adjustment instructions sent by the power grid dispatching master station, collects the real-time information and operating status of the grid connection point, inverter, and reactive power compensation device, calculates the target value and distributes the target instruction to the inverter and reactive power compensation device; A battery management unit monitors the operating status, charging and discharging time, battery pack output, and voltage and power regulation of the inverter connected to the network in real time, so that the integrated intelligent terminal automatically receives and executes the energy storage output regulation instructions sent by the power grid dispatching master station.

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