A power distribution network supervision system applied to a power distribution network framework structure

Abstract

The utility model relates to the field of distribution supervision, disclose a kind of distribution network supervision system applied to distribution network framework structure, distribution network supervision system is configured based on distribution network framework structure, multiple power flow controllers are configured in multiple power supply areas and are interconnected, power flow controller connects multiple electric energy monitoring module, intelligent soft switch, respectively monitor the power and electric index of the regional distributed energy group, power end, energy storage facility, power grid, respectively receive power and electric index data through the power flow controller of multiple areas and carry out power supply analysis, implement power flow transmission control, including regional power generation consumption control, power gap compensation control, and multi-region power flow controller cooperation implements cross-region power generation consumption control, through the first, second, third, fourth branch line of power supply main line configuration and the electric energy transmission in the implementation of multiple power flow transmission control of corresponding intelligent soft switch configured, realize the power generation remaining intelligent deployment of multiple regional distributed energy and the power supplement of power end.

Description

Technical Field

[0001] This utility model relates to the field of power distribution monitoring, and in particular to a power distribution monitoring system applied to the power distribution network structure. Background Technology

[0002] With the gradual development and improvement of distribution network structure and distributed energy, the integrated application of distributed energy in distribution network structure has become more common and important. Specifically, based on the distribution network structure, it is increasingly important to improve the intelligent dispatching of distributed energy to the power consumption end, the intelligent allocation of surplus power to energy storage facilities and the power grid, and the supply to more power consumption ends across regions, so as to realize the comprehensive dispatching and intelligent distribution dispatching of distributed energy generation.

[0003] Furthermore, a distribution network monitoring system is needed for the distribution network structure. This system should monitor the total power generation of distributed energy groups in multiple power supply and consumption areas, the total power consumption at the consumption end, the energy storage facilities at the smart distribution end, and the power dispatch indicators of the power grid in real time. This system should enable regional power generation and consumption control, power shortage compensation control, and cross-regional power generation and consumption control. It should also enable intelligent and efficient allocation of power generated by distributed energy groups, which is a technical requirement that the distribution network structure urgently needs to address. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a power distribution network monitoring system applicable to power distribution network structures.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a power distribution network structure is configured with a power distribution network monitoring system, and multiple power flow controllers with electrical connections are configured for use in multiple power supply and consumption areas; Each regional power flow controller is connected to multiple power monitoring modules and multiple smart soft switches to implement power supply and demand monitoring and power flow control within its region, including: The power supply and demand monitoring implemented by the distribution network monitoring system involves connecting multiple power monitoring modules to distributed energy groups, power consumers, energy storage facilities, and the power grid to monitor total power generation, power consumption, the energy storage capacity of energy storage facilities, and the grid's compliance with demand support. The monitoring data is then transmitted to the power flow controller for power supply and demand analysis. The method for implementing power flow transmission control in the configuration of a distribution network structure includes: configuring a main power supply line of a distributed energy group to transmit power to the power consumption end, and configuring first and second branch lines to connect to the energy storage facility and the power grid, wherein the branch lines are respectively configured with first and second intelligent soft switches to implement power transmission start-up and shutdown control; The multi-region power flow controller performs power supply and consumption analysis. When it determines the first result that the power generation is greater than the power consumption at the power consumption end, and the second result that the energy storage threshold of the energy storage facility is lower than the first set high threshold and / or the power grid meets the power demand support standard, it controls the corresponding smart soft switch to open in the positive direction, and implements the power generation and consumption control of the area where the surplus power is transmitted to the energy storage facility and / or the power grid. The main power supply lines of any two regions are connected by a third branch line and a fourth branch line respectively, and a third intelligent soft switch and a fourth intelligent soft switch are configured to implement the unidirectional transmission of surplus electrical energy between the two regions through the third branch line and the fourth branch line respectively, and to implement cross-regional power generation and consumption control. The first and second intelligent soft switches are switches with bidirectional control functions.

[0006] Furthermore, the cross-regional power generation consumption control implemented by the multi-regional power flow controller includes: When the power flow controller of the first region determines the first result and the opposite second result, and the power flow controller of the second region determines at least the opposite first result of its own region, the power flow controller of the second region receives the first result and the opposite second result sent by the power flow controller of the first region, and directly / indirectly controls the third intelligent soft switch to open and transmits the remaining power of the power supply main line of the first region to the power supply main line of the second region through the third branch line, thereby implementing the first cross-regional power generation and absorption control between the two regions. Meanwhile, when the power flow controller of the second region determines the first result and the opposite second result, and the power flow controller of the first region determines at least the opposite first result of its own region, the power flow controller of the first region receives the first result and the opposite second result sent by the power flow controller of the second region, and directly / indirectly controls the fourth intelligent soft switch to open and transmits the remaining power of the power supply main line of the second region to the power supply main line of the first region through the fourth branch line, thereby implementing the second cross-regional power generation and absorption control of the two regions.

[0007] Furthermore, the power generation and consumption control in the first and second regions is also configured with reverse power shortage compensation control. When the power flow controller of the region determines that the power generation is less than the power consumption at the end of the power supply, the first power monitoring module monitors the discharge power of the energy storage facility, and the second power monitoring module monitors the compliance of the power grid with the power acceptance standard and sends the data to the power flow controller. When the energy storage threshold of the energy storage facility is higher than the first set low threshold and / or the power grid meets the power acceptance standard, the corresponding first smart soft switch and / or second smart soft switch are controlled to open in reverse. The energy storage facility and / or the power grid output power to the main power supply line and directly supply power to the end of the power supply in the region to implement power shortage compensation control.

[0008] Furthermore, when implementing inter-regional power generation and consumption control, the power flow controllers of the first and second regions, through interactive signals and confirmation that the synchronization conditions are met, then execute the relevant inter-regional power transmission control, including: The power flow controller of the first region, which performs power supply and consumption analysis and obtains a first result and a second result, actively sends the result to the power flow controllers of multiple adjacent regions. The power flow controller of the second region, which obtains a second result that is opposite to the first result or simultaneously obtains a second result that is opposite to the first result and a third result, processes the result based on the confirmation result of the synchronization condition. It directly or indirectly controls the opening of the third intelligent soft switch and transmits the remaining power of the power supply main line of the first region to the power supply main line of the second region through the third branch line, thereby implementing the first cross-regional power generation and consumption control between the two regions.

[0009] Furthermore, when implementing inter-regional power generation and consumption control, taking the first inter-regional power generation and consumption control as an example, a confirmation procedure for meeting synchronization conditions is also pre-executed, including: The power supply mains set in the multiple regions are also connected to an automatic synchronization device to measure the voltage, frequency, and phase signals of the power supply mains in their respective regions and send them to the power flow controllers in their respective regions. The multiple power flow controllers interact with each other. The power flow controller of the first region, which sends a first result and a second result, also sends the voltage, frequency, and phase signals measured by the automatic synchronization device to the power flow controller of the second region and forwards them to the automatic synchronization device of the second region to compare them with the voltage, frequency, and phase signals measured in its own region. If the voltage difference is within 7% of the rated value fluctuation, the frequency difference fluctuation is within 0.1Hz, and the phase difference is less than the set threshold, then the synchronization conditions are determined to be met. The power flow controller of the second region receives a confirmation signal that the synchronization conditions are met. Based on all the results of the first inter-regional power generation and absorption control, it determines that the standard is met and begins to implement the first inter-regional power generation and absorption control, including authorizing the automatic synchronizing device to control the third intelligent soft switch to start the power transmission procedure.

[0010] Preferably, the distributed energy groups in the first and second regions include parallel photovoltaic power generation equipment and wind power generation equipment connected to the main power supply line. They are connected to the main power supply line through a third power monitoring module to monitor the overall power generation of multiple distributed energy devices in the region. This includes measuring the transmission current and transmission voltage of the main power supply line through a current sensor and a first voltage sensor, and simultaneously calculating the overall transmission power and sending it to the power flow controller of the region.

[0011] Preferably, the fourth power monitoring module configured in each power supply area to monitor the power consumption of the user end includes a bidirectional smart meter, which is installed at the main incoming line of the power supply main line in the area where the power consumption end is located, and monitors the total power consumption of the power consumption end in the area.

[0012] Preferably, the first power monitoring module of the energy storage facility configured in each power supply area is communicatively connected to the battery management system (BMS) of the energy storage facility. The BMS dynamically calculates the safety limit, i.e. the maximum allowable charging power, based on the current state of charge (SOC), battery temperature, and state of health (SOH) of the energy storage facility. The first power monitoring module also measures the status of the energy storage converter (PCS) and determines whether the PCS is in standby or rechargeable mode. Based on the received monitoring data, the first power monitoring module determines that the energy storage facility can store the minimum of the maximum allowable charging power provided by the BMS and the rated power of the PCS, and uses this as a reference standard for transmitting the remaining power through the first branch line and charging the energy storage facility.

[0013] Furthermore, the first power monitoring module of the energy storage facility configured in each power supply area is communicatively connected to the battery management system (BMS) of the energy storage facility. The BMS dynamically calculates the safety limit, i.e. the maximum allowable discharge power, based on the current state of charge (SOC), battery temperature, state of health (SOH), and minimum allowable operating voltage of the energy storage facility. The first power monitoring module also monitors the status of the energy storage converter (PCS) and determines whether the PCS is in standby / operation state or in discharge mode. Based on the received monitoring data, the first power monitoring module determines that the discharge power of the energy storage facility is the minimum of the maximum allowable discharge power provided by the BMS and the rated power of the PCS. This value is then used as a reference standard for outputting power to the main power supply line through the first branch line, which also serves as a power shortage compensation control for the energy storage facility.

[0014] Preferably, the second power monitoring module of the power grid configured in each power supply and consumption area includes a second voltage sensor installed at the power grid access point to monitor the power grid voltage, and a frequency measuring device installed at the power grid access point to monitor the frequency. If the monitored voltage is lower than the rated value (e.g., more than 7% of the nominal value) or the frequency is less than the standard value and fluctuates by more than 0.1 Hz, it is determined that the power grid meets the power demand support standard and is used as a reference standard for transmitting the remaining power generation to the power grid control through the second branch line.

[0015] Furthermore, if the second voltage sensor of the second power monitoring module of the power grid configured in each power supply and consumption area monitors the power grid voltage and finds it to be stable within 7% of the rated value, and the frequency monitored by the frequency measuring device is within 0.1Hz of the standard value fluctuation, then the power grid is determined to meet the power acceptance standard, and this is used as a reference standard for outputting power to the main power supply line through the second branch line, that is, for implementing power shortage compensation control for the power grid.

[0016] This utility model has the following beneficial effects: In this invention, based on the distribution network structure, the distributed energy group generating green energy is intelligently transmitted to regional power users for priority use. The remaining power is distributed to energy storage facilities and the power grid through the first and second branches, and distributed to other power users across regions through the third / fourth branches. In addition, power gap compensation is achieved through the reverse configuration of the first and second branches. This realizes intelligent output and gap compensation as green energy generation, and realizes intelligent power supply and consumption allocation of distributed energy groups based on the distribution network structure. This greatly improves the comprehensive optimization of green energy use and intelligent power allocation, and meets the requirements of efficient use of green energy generation and efficient application of the distribution network structure.

[0017] In this invention, through intelligent power distribution dispatching of the power distribution network monitoring system, combined with power supply and consumption monitoring of the power monitoring module, the distributed energy group prioritizes the supply of electricity to the power consumption end, and implements regional power generation and consumption control and cross-regional power generation and consumption control for surplus electricity. This greatly ensures the efficient utilization of distributed energy group power generation and power application dispatching. Combined with power gap compensation control applied to the power consumption end, it realizes that the power consumption end can use electricity at low cost through green energy power generation and power consumption compensation, intelligent power generation and consumption, as well as efficient and intelligent power distribution of green energy. Furthermore, it realizes the further expansion and implementation of the distributed energy efficient power supply and consumption, intelligent dispatching technology effect and solves related technical needs problems of the power distribution network monitoring system based on the power distribution network structure. Attached Figure Description

[0018] Figure 1 This utility model presents an overall structural diagram of a power distribution network monitoring system applied to a power distribution network structure. Figure 2 This utility model provides a schematic diagram showing the overall structure of power supply lines and intelligent soft switches in a power distribution network monitoring system applied to a power distribution network structure.

[0019] Legend: 11. Power flow controller for the first region; 12. Power flow controller for the second region; 13. Automatic synchronization device; 20. Main power supply line; 21. Third power monitoring module; 211. Current sensor; 212. First voltage sensor; 22. Distributed energy group; 30. First branch line; 31. First power monitoring module; 32. First intelligent soft switch; 33. Energy storage facility; 331. Battery management system; 332. Energy storage converter; 40. Second branch line; 41. Second power monitoring module; 411. Second voltage sensor; 412. Frequency measurement device; 42. Second intelligent soft switch; 43. Power grid; 50. Power consumption end; 51. Fourth power monitoring module; 511. Two-way smart meter; 60. Third branch line; 61. Third intelligent soft switch; 70. Fourth branch line; 71. Fourth intelligent soft switch. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Reference Figure 1-2 This utility model provides an embodiment of a distribution network monitoring system applied to a distribution network structure: A distribution network monitoring system applied to a distribution network structure, wherein the distribution network structure is configured with a distribution network monitoring system and a power flow controller with multiple electrical connections is applied to multiple power supply and consumption areas; Each regional power flow controller is connected to multiple power monitoring modules and multiple smart soft switches to implement power supply and demand monitoring and power flow control within its region, including: The power supply and demand monitoring implemented by the power distribution network monitoring system: Through multiple power monitoring modules connected to the distributed energy group 22, the power consumption end 50, the energy storage facility 33, and the power grid 43 respectively, the system monitors the total power generation, power consumption, the energy storage capacity of the energy storage facility 33, and the power grid 43's compliance with power demand support, and transmits the monitoring data to the power flow controller for power supply and consumption analysis. The method for implementing power flow transmission control in the configuration of a distribution network structure includes: a main power supply line 20 is configured for the distributed energy group 22 to transmit power to the power consumption end 50, and first and second branch lines 40 are configured to connect to the energy storage facility 33 and the power grid 43. The branch lines are respectively configured with first and second intelligent soft switches 42 to implement power transmission start-up and shut-down control, which is used to implement the priority supply of the power generated by the distributed energy group 22 to the power consumption end 50 in the region through the regional power flow controller, and the remaining power is transmitted to the energy storage facility 33 and the power grid 43 through the first and second branch lines 40. The first and second intelligent soft switches 42 control the power transmission start-up and shut-down of the branch lines. Specifically, the multi-region power flow controller performs power supply and consumption analysis. When it determines that the power generation is greater than the power consumption of the power consumption terminal 50, and when it determines that the energy storage threshold of the energy storage facility 33 is lower than the first set high threshold and / or the power grid 43 meets the power demand support standard, it controls the corresponding smart soft switch to open in the positive direction. It then implements the power generation and consumption control of the region where the surplus power is transmitted to the energy storage facility 33 and / or the power grid 43, so as to realize the benefit of transmitting to the energy storage facility 33 and / or the power grid 43. When the power consumption of the power consumption terminal 50 in the region is insufficient, it outputs the required power to supplement the power consumption. Furthermore, the main power supply lines 20 of any two regions are connected by a third branch line 60 and a fourth branch line 70, respectively, and a third intelligent soft switch 61 and a fourth intelligent soft switch 71 are configured. The surplus power between the two regions is transmitted unidirectionally through the third branch line 60 and the fourth branch line 70 and used for cross-regional power generation and consumption control. The surplus power is supplied to the power consumption end 50 across regions. When the power consumption of multiple power supply and consumption areas is insufficient, the surplus power generated by the distributed energy group 22 can be directly supplemented across regions, increasing the ways to meet the power demand of the power consumption end 50 of multiple power supply and consumption areas. The first and second intelligent soft switches 42 are switches with bidirectional control functions. Through the distinction between forward opening and reverse opening provided in this embodiment, the flow effect of residual electrical energy being output from the main power supply line 20 to the energy storage facility 33 and the power grid 43, and the flow of electrical energy being output from the energy storage facility 33 and the power grid 43 to the main power supply line 20 and further supplied to the power consumption terminal 50 is defined.

[0022] Furthermore, the cross-regional power generation consumption control implemented by the multi-regional power flow controller includes: When the power flow controller 11 of the first region determines the first result and the opposite second result, and the power flow controller 12 of the second region determines at least the opposite first result of its own region, the power flow controller 12 of the second region receives the first result and the opposite second result sent by the power flow controller 11 of the first region, and directly / indirectly (preferably indirectly) controls the third intelligent soft switch 61 to open and transmit the remaining power of the power supply main line 20 of the first region to the power supply main line 20 of the second region through the third branch line 60, thereby implementing the first cross-regional power generation and absorption control between the two regions; Simultaneously, when the power flow controller 12 of the second region determines the first result and the opposite second result, and the power flow controller 11 of the first region determines at least the opposite first result of its own region, the power flow controller 11 of the first region receives the first result and the opposite second result sent by the power flow controller 12 of the second region, and directly / indirectly (preferably indirectly) controls the fourth intelligent soft switch 71 to open and transmits the remaining power of the power supply main line 20 of the second region to the power supply main line 20 of the first region through the fourth branch line 70, thus implementing the second cross-regional power generation absorption control between the two regions. The first cross-regional power generation absorption control and the second cross-regional power generation absorption control serve as a standard for explaining the control logic of specific cross-regional power generation absorption control and distinguishing the power flow controllers that implement the control. The power flow controller 11 of the first region and the power flow controller 12 of the second region do not specifically indicate that the power flow controllers of multiple regions are directly defined and pointed to as the power flow controller 11 of the first region and the power flow controller 12 of the second region. Other descriptions of the first and second are also for the purpose of distinguishing related descriptions of the same type, and do not have any actual, directional designation or distinction and embodiment of actual meaning.

[0023] Furthermore, the power generation and consumption control in the first and second regions is also configured with reverse power shortage compensation control. When the power flow controller of the region determines that the power generation is less than the power consumption of the power consumption terminal 50 based on the opposite first result, the first power monitoring module 31 monitors the discharge power of the energy storage facility 33 and the second power monitoring module 41 monitors the compliance of the power grid 43 with the power acceptance standard and sends the data to the power flow controller. When the energy storage threshold of the energy storage facility 33 is higher than the first set low threshold and / or the power grid 43 meets the power acceptance standard, the corresponding first smart soft switch 32 and / or second smart soft switch 42 are controlled to open in reverse. The energy storage facility 33 and / or the power grid 43 output power to the main power supply line 20 and directly supply power to the power consumption terminal 50 in the region to implement power shortage compensation control.

[0024] Furthermore, when implementing inter-regional power generation and consumption control, the power flow controller 11 of the first region and the power flow controller 12 of the second region, after exchanging signals and confirming that the synchronization conditions are met, then execute the relevant inter-regional power transmission control, including: The power flow controller 11 of the first region, which performs power supply and consumption analysis and obtains a first result and a second result, actively sends the result to the power flow controllers of multiple adjacent regions. The power flow controller 12 of the second region, which obtains a second result that is opposite to the first result or simultaneously obtains a second result that is opposite to the first result and a third result, processes the result based on the confirmation result of matching the synchronization conditions. It directly or indirectly (preferably indirectly) controls the third intelligent soft switch 61 to open and transmits the remaining power of the power supply main line 20 of the first region to the power supply main line 20 of the second region through the third branch line 60, thereby implementing the first cross-regional power generation and consumption control between the two regions.

[0025] Furthermore, when implementing inter-regional power generation and consumption control, taking the first inter-regional power generation and consumption control as an example, a confirmation procedure for meeting synchronization conditions is also pre-executed, including: The power supply main line 20 set in the multiple regions is also connected to an automatic synchronization device 13 to measure the voltage, frequency and phase signals of the power supply main line 20 in its respective region, and send them to the power flow controller of the region. The multiple power flow controllers interact with each other. The power flow controller 11 of the first region, which sends the first result and the opposite second result, also sends the voltage, frequency and phase signals measured by the automatic synchronization device 13 to the power flow controller 12 of the second region, and forwards them to the automatic synchronization device 13 of the second region to compare them with the voltage, frequency and phase signals measured in its own region. If the voltage difference is within 7% of the rated value fluctuation, the frequency difference fluctuation is within 0.1Hz, and the phase difference is less than the set threshold, then the synchronization conditions are confirmed to be met. The power flow controller 12 of the second region receives a synchronization condition compliance confirmation signal. Based on all the results of the first inter-regional power generation absorption control, it determines that the first inter-regional power generation absorption control meets the standard, specifically that the power flow controller 11 of the first region satisfies the first result and the opposite second result, and the power flow controller 12 of the second region at least determines the opposite first result in its own region. Then, it begins to implement the first inter-regional power generation absorption control, including authorizing the automatic synchronizing device 13 (i.e., the indirect control) to control the third intelligent soft switch 61 to open and implement the power transmission procedure. Specifically, this involves transmitting the remaining power of the first region's main power supply line 20 to the second region's main power supply line 20 through the third branch line 60, thus realizing the first inter-regional power generation absorption control between the two regions. The pre-execution of the synchronization condition compliance confirmation procedure and the related control of the fourth intelligent soft switch 71 to open and implement the power transmission procedure in the second inter-regional power generation absorption control are consistent with the relevant logic of the first inter-regional power generation absorption control described in detail, and will not be repeated in this embodiment.

[0026] Preferably, the distributed energy group 22 in the first and second regions includes photovoltaic power generation equipment and wind power generation equipment connected in parallel and uniformly connected to the main power supply line 20. It is connected to the main power supply line 20 through a third power monitoring module 21 to uniformly monitor the overall power generation of multiple distributed energy devices in the region. This includes measuring the transmission current and transmission voltage of the main power supply line 20 through a current sensor 211 and a first voltage sensor 212, and simultaneously calculating the overall transmission power, which is then sent to the power flow controller of the region to obtain the overall output power of the distributed energy group 22.

[0027] Preferably, the fourth power monitoring module 51 configured in each power supply area to monitor the power consumption of the user terminal includes a bidirectional smart meter 511, which is installed at the main incoming line of the power supply main line 20 in the area where the power consumption terminal 50 is located, and monitors the total power consumption of the power consumption terminal 50 in the area.

[0028] Preferably, the first power monitoring module 31 of the monitoring energy storage facility 33 configured in each power supply area is communicatively connected to the battery management system 331 (BMS) of the energy storage facility 33. The BMS dynamically calculates the safety limit, i.e. the maximum allowable charging power, based on the current state of charge (SOC), battery temperature, and state of health (SOH) of the energy storage facility 33. The first power monitoring module 31 also measures the status of the energy storage converter 332 (PCS) and determines whether the PCS is in standby or rechargeable mode. Based on the received monitoring data, the first power monitoring module 31 determines that the energy storage capacity of the energy storage facility 33 is the minimum of the maximum allowable charging power provided by the BMS and the rated power of the PCS. This value is used as a reference standard for controlling the transmission of surplus power through the first branch line 30 to the energy storage facility 33. This is used to implement the control of the surplus power generated by the distributed energy group 22 in the area to the energy storage facility 33 whose energy storage threshold is lower than the first set high threshold through the first branch line 30. This also corresponds to the power generation and consumption control in the area.

[0029] Furthermore, the first power monitoring module 31 of the monitoring energy storage facility 33 configured in each power supply area is communicatively connected to the battery management system 331 (BMS) of the energy storage facility 33. The BMS dynamically calculates the safety limit, i.e. the maximum allowable discharge power, based on the current state of charge (SOC), battery temperature, state of health (SOH), and minimum allowable operating voltage of the energy storage facility 33. The first power monitoring module 31 also monitors the status of the energy storage converter 332 (PCS) and determines whether the PCS is in standby / operation state or in dischargeable mode. Based on the received monitoring data, the first power monitoring module 31 determines that the discharge power of the energy storage facility 33 is the minimum of the maximum allowable discharge power provided by the BMS and the rated power of the PCS. This value is used as a reference standard for outputting power to the main power supply line 20 via the first branch line 30, which also serves as a power shortage compensation control for the energy storage facility 33. When the power flow controller determines that the energy storage threshold of the energy storage facility 33 is higher than the first set low threshold, it controls the corresponding first intelligent soft switch 32 to open in reverse, controlling the energy storage facility 33 to output power to the main power supply line 20 and directly supply power to the power consumption end 50 in the area to implement power shortage compensation control.

[0030] Preferably, the second power monitoring module 41 of the monitoring grid 43 configured in each power supply and consumption area includes a second voltage sensor 411 installed at the grid 43 access point to monitor the grid 43 voltage, and a frequency measuring device 412 installed at the grid 43 access point to monitor the frequency. If the monitored voltage is lower than the rated value (e.g., more than 7% of the nominal value) or the frequency is less than the standard value and fluctuates by more than 0.1Hz, then the grid 43 is determined to meet the power demand support standard and is used as a reference standard for controlling the transmission of surplus power generation to the grid 43 via the second branch line 40. This is used to implement the charging of surplus power generated by the distributed energy group 22 in the area to the grid 43 that meets the power demand support standard via the second branch line 40, which also corresponds to the power generation consumption control in the area.

[0031] Furthermore, the second voltage sensor 411 of the second power monitoring module 41 of the monitoring grid 43 configured in each power supply area monitors the voltage of the grid 43 to be stable within 7% of the rated value, and the frequency measurement device 412 monitors the frequency within 0.1Hz of the standard value fluctuation. If the grid 43 is found to meet the power acceptance standard, it is determined that the grid 43 meets the power acceptance standard and is used as a reference standard for outputting power to the main power supply line 20 through the second branch line 40, that is, for power supply gap compensation control of the grid 43. When the power flow controller determines that the grid 43 meets the power acceptance standard, it controls the corresponding first intelligent soft switch 32 to open in reverse, controls the grid 43 to output power to the main power supply line 20 and directly supplies power to the power supply end 50 in the area to implement power supply gap compensation control.

[0032] The third power monitoring module 21 is located at the point where the distributed energy group 22 is uniformly connected to the main power supply line 20, and is positioned at the front end of the first branch line 30 and the second branch line 40 extending from the main power supply line 20. The fourth power monitoring module 51 is installed at the main incoming line in the area where the power consumption terminal 50 is located in the main power supply line 20, and is positioned at the rear end of the first branch line 30 and the second branch line 40 extending from the main power supply line 20. Optionally, the second branch line 40 is located at the rear end of the first branch line 30. Preferably, as... Figure 2 As shown, the third branch line 60 and the fourth branch line 70 are located at the front end of the first and second branch lines 40 and at the rear end of the distributed energy group 22 in the main power supply line 20 where the third power monitoring module 21 is installed.

[0033] Working principle: Each power supply and consumption area is equipped with distributed energy groups 22, including photovoltaic power generation, wind power generation equipment, and hydropower generation equipment. Based on the number and rated power of the distributed energy generation equipment, multiple power supply and consumption areas are divided according to the different power demands of the power consumption end 50. Power supply and consumption analysis is carried out by the power flow controller in the area. The power generated by the distributed energy group 22 in the area is used to supplement the power consumption of the power consumption end 50 through the main power supply line 20. When the energy storage threshold of the energy storage facility 33 at the connection end is lower than the first set high threshold and / or the power grid 43 meets the second result of the power demand support standard, the remaining power is transmitted to the energy storage facility 33 and / or the power grid 43 through the first branch line 30 and / or the second branch line 40 to realize the power generation and consumption control in the area; wherein the first and / or the second intelligent soft switch 42 is controlled by the power flow controller to be opened in the positive direction. When the power consumption at the power consumption end 50 in the region is insufficient, the power flow controller implements power shortage compensation control. When the energy storage threshold of the energy storage facility 33 is higher than the first set low threshold and / or the power grid 43 meets the power acceptance standard, the controller controls the first and / or the second smart soft switch 42 to open in reverse to transmit power from the energy storage facility 33 and / or the power grid 43 to the main power supply line 20 and supply power to the power consumption end 50. Simultaneously, cross-regional power generation and consumption control is configured. When the power flow controller 11 of the first region determines, based on the first result and the opposite second result, that the power flow controller 12 of the second region has at least determined the opposite first result of its own region, the power flow controller 12 of the second region receives the first result and the opposite second result, and executes the synchronization condition matching confirmation procedure. Through the authorized automatic synchronization device 13, it controls the third intelligent soft switch 61 to open and implement the transmission of the remaining power of the power supply main line 20 of the first region to the power supply main line 20 of the second region through the third branch line 60 for use by the power consumption terminal 50 in the region. Similar to the first cross-regional power generation and consumption control, there is also a second cross-regional power generation and consumption control. When a power consumption gap occurs in the power consumption terminal 50 of one region, the power supply of the other region with surplus power generation is transmitted through the fourth branch line 70 to make up for the power consumption.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A distribution network monitoring system applied to a distribution network structure, characterized in that: The power distribution network structure is equipped with a power distribution network monitoring system, and a power flow controller with multiple electrical connections is used in multiple power supply and consumption areas; Each regional power flow controller is connected to multiple power monitoring modules and multiple smart soft switches to implement power supply and demand monitoring and power flow control within its region, including: The power supply and demand monitoring implemented by the distribution network monitoring system involves connecting multiple power monitoring modules to distributed energy groups, power consumers, energy storage facilities, and the power grid to monitor total power generation, power consumption, the energy storage capacity of energy storage facilities, and the grid's compliance with demand support. The monitoring data is then transmitted to the power flow controller for power supply and demand analysis. The method for implementing power flow transmission control in the configuration of a distribution network structure includes: configuring a main power supply line of a distributed energy group to transmit power to the power consumption end, and configuring first and second branch lines to connect to the energy storage facility and the power grid, wherein the branch lines are respectively configured with first and second intelligent soft switches to implement power transmission start-up and shutdown control; The multi-region power flow controller performs power supply and consumption analysis. When it determines the first result that the power generation is greater than the power consumption at the power consumption end, and the second result that the energy storage threshold of the energy storage facility is lower than the first set high threshold and / or the power grid meets the power demand support standard, it controls the corresponding smart soft switch to open in the positive direction, and implements the power generation and consumption control of the area where the surplus power is transmitted to the energy storage facility and / or the power grid. The main power supply lines of any two regions are connected by a third branch line and a fourth branch line respectively, and a third intelligent soft switch and a fourth intelligent soft switch are configured to implement the unidirectional transmission of surplus electrical energy between the two regions through the third branch line and the fourth branch line respectively, and to implement cross-regional power generation and consumption control. The first and second intelligent soft switches are switches with bidirectional control functions.

2. The distribution network monitoring system applied to the distribution network structure according to claim 1, characterized in that: The cross-regional power generation consumption control implemented by the multi-regional power flow controller includes: When the power flow controller of the first region determines the first result and the opposite second result, and the power flow controller of the second region determines at least the opposite first result of its own region, the power flow controller of the second region receives the first result and the opposite second result sent by the power flow controller of the first region, and directly / indirectly controls the third intelligent soft switch to open and transmits the remaining power of the power supply main line of the first region to the power supply main line of the second region through the third branch line, thereby implementing the first cross-regional power generation and absorption control between the two regions. Meanwhile, when the power flow controller of the second region determines the first result and the opposite second result, and the power flow controller of the first region determines at least the opposite first result of its own region, the power flow controller of the first region receives the first result and the opposite second result sent by the power flow controller of the second region, and directly / indirectly controls the fourth intelligent soft switch to open and transmits the remaining power of the power supply main line of the second region to the power supply main line of the first region through the fourth branch line, thereby implementing the second cross-regional power generation and absorption control of the two regions.

3. A distribution network monitoring system applied to a distribution network structure according to claim 2, characterized in that: In the power generation and consumption control within the first and second regions, a reverse power shortage compensation control is also configured. When the power flow controller of the region determines, based on the opposite first result (i.e., when the power generation is less than the power consumption at the end of the power consumption terminal), the first power monitoring module monitors the discharge power of the energy storage facility, and the second power monitoring module monitors the compliance of the power grid with the power acceptance standard and sends the data to the power flow controller. When it is determined that the energy storage threshold of the energy storage facility is higher than the first set low threshold and / or the power grid meets the power acceptance standard, the corresponding first smart soft switch and / or second smart soft switch are controlled to open in reverse. This controls the energy storage facility and / or the power grid to output power to the main power supply line and directly supply power to the end of the power consumption terminal in the region to implement power shortage compensation control.

4. A distribution network monitoring system applied to a distribution network structure according to claim 3, characterized in that: When implementing inter-regional power generation and consumption control, the power flow controllers of the first and second regions, after exchanging signals and confirming that the synchronization conditions are met, then execute the relevant inter-regional power transmission control, including: The power flow controller of the first region, which performs power supply and consumption analysis and obtains a first result and a second result, actively sends the result to the power flow controllers of multiple adjacent regions. The power flow controller of the second region, which obtains a second result that is opposite to the first result or simultaneously obtains a second result that is opposite to the first result and a third result, processes the result based on the confirmation result of the synchronization condition. It directly or indirectly controls the opening of the third intelligent soft switch and transmits the remaining power of the power supply main line of the first region to the power supply main line of the second region through the third branch line, thereby implementing the first cross-regional power generation and consumption control between the two regions.

5. A distribution network monitoring system applied to a distribution network structure according to claim 4, characterized in that: When implementing inter-regional power generation and consumption control, taking the first inter-regional power generation and consumption control as an example, a synchronization condition compliance confirmation procedure is also pre-executed, including: The power supply mains set in the multiple regions are also connected to an automatic synchronization device to measure the voltage, frequency, and phase signals of the power supply mains in their respective regions and send them to the power flow controllers in their respective regions. The multiple power flow controllers interact with each other. The power flow controller of the first region, which sends a first result and a second result, also sends the voltage, frequency, and phase signals measured by the automatic synchronization device to the power flow controller of the second region and forwards them to the automatic synchronization device of the second region to compare them with the voltage, frequency, and phase signals measured in its own region. If the voltage difference is within 7% of the rated value fluctuation, the frequency difference fluctuation is within 0.1Hz, and the phase difference is less than the set threshold, then the synchronization conditions are determined to be met. The power flow controller of the second region receives a confirmation signal that the synchronization conditions are met. Based on all the results of the first inter-regional power generation and absorption control, it determines that the standard is met and begins to implement the first inter-regional power generation and absorption control, including authorizing the automatic synchronizing device to control the third intelligent soft switch to start the power transmission procedure.

6. A distribution network monitoring system applied to a distribution network structure according to claim 5, characterized in that: The distributed energy groups in the first and second regions include parallel photovoltaic power generation equipment and wind power generation equipment, which are uniformly connected to the main power supply line. They are connected to the main power supply line through a third power monitoring module to uniformly monitor the overall power generation of multiple distributed energy devices in the region. This includes measuring the transmission current and transmission voltage of the main power supply line through current sensors and a first voltage sensor, and simultaneously calculating the overall transmission power, which is then sent to the power flow controller of the region.

7. A distribution network monitoring system applied to a distribution network structure according to claim 6, characterized in that: The fourth power monitoring module configured in each power supply and consumption area to monitor the power consumption of user terminals includes a bidirectional smart meter, which is installed at the main incoming line of the power supply main line in the area where the power consumption terminal is located, and monitors the total power consumption of the power consumption terminal in the area.

8. A distribution network monitoring system applied to a distribution network structure according to claim 7, characterized in that: The first power monitoring module of the energy storage facility configured in each power supply area is communicatively connected to the battery management system (BMS) of the energy storage facility. The BMS dynamically calculates the safety limit, i.e. the maximum allowable charging power, based on the current state of charge (SOC), battery temperature, and state of health (SOH) of the energy storage facility. The first power monitoring module also measures the status of the energy storage converter (PCS) and determines whether the PCS is in standby or rechargeable mode. Based on the received monitoring data, the first power monitoring module determines that the energy storage facility can store the minimum of the maximum allowable charging power provided by the BMS and the rated power of the PCS, and uses this as a reference standard for transmitting the remaining power through the first branch line and charging the energy storage facility.

9. A distribution network monitoring system applied to a distribution network structure according to claim 8, characterized in that: The first power monitoring module of the energy storage facility configured in each power supply and consumption area is communicatively connected to the battery management system (BMS) of the energy storage facility. The BMS dynamically calculates the safety upper limit, i.e. the maximum allowable discharge power, based on the current state of charge (SOC), battery temperature, state of health (SOH), and minimum allowable operating voltage of the energy storage facility. The first power monitoring module also monitors the status of the energy storage converter (PCS) and determines whether the PCS is in standby / operation state or in discharge mode. Based on the received monitoring data, the first power monitoring module determines that the discharge power of the energy storage facility is the minimum of the maximum allowable discharge power provided by the BMS and the rated power of the PCS. This value is then used as a reference standard for outputting power to the main power supply line through the first branch line, which also serves as a power shortage compensation control for the energy storage facility.

10. A distribution network monitoring system applied to a distribution network structure according to claim 9, characterized in that: The second power monitoring module of the power grid configured in each power supply and consumption area includes a second voltage sensor installed at the power grid access point to monitor the power grid voltage, and a frequency measuring device installed at the power grid access point to monitor the frequency. If the monitored voltage is lower than the rated value by more than 7% of the nominal value, or the frequency is lower than the standard value and fluctuates by more than 0.1Hz, it is determined that the power grid meets the power demand support standard and is used as a reference standard for transmitting the remaining power generation to the power grid control through the second branch line.

11. A distribution network monitoring system applied to a distribution network structure according to claim 10, characterized in that: If the second voltage sensor of the second power monitoring module of the power grid configured in each power supply and consumption area monitors the power grid voltage and finds it to be stable within 7% of the rated value, and the frequency monitored by the frequency measuring device is within 0.1Hz of the standard value fluctuation, then the power grid is determined to meet the power acceptance standard and is used as a reference standard for outputting power to the main power supply line through the second branch line, that is, for implementing power shortage compensation control for the power grid.

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