Intelligent distributed power distribution automation terminal and system and fault discrimination method thereof
By using a communication timing management unit and a GPS/Beidou timing system in the intelligent distributed distribution automation terminal, combined with the FPGA and MCU dual computing system, the problems of high cost and complex maintenance in the existing technology are solved, and the rapid and accurate positioning and efficient judgment of 10KV line voltage faults are achieved.
Patent Information
- Application Number
- CN202510382689.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2025-07-11
AI Technical Summary
In the prior art, a distributed DTU system requires multiple communication time management units, which is costly and complex to maintain, making it difficult to achieve fast and accurate 10KV line voltage fault location.
It adopts an intelligent distributed distribution automation terminal, connects six measurement and control protection units through a communication timing management unit, and adds a GPS/Beidou timing system, and combines the FPGA and MCU dual computing system to realize high-speed sampling and big data computing, supporting peer-to-peer communication and regulation conversion between terminals.
It realizes rapid and accurate positioning of 10KV line voltage faults, reduces costs, and is designed independently by each functional unit, and can be replaced separately during failure, without affecting normal use, and improves the efficiency and accuracy of fault determination.
Smart Images
Figure CN120301032A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of intelligent distributed power distribution, and in particular to an intelligent distributed power distribution automation terminal, a system and a method for judging faults thereof. Background Art
[0002] With the rapid development of China's national economy, electricity plays a fundamental role in the national economy. As a basic input for production and a necessity for people's livelihood, its status in the national economy is becoming increasingly important. At the same time, power users have higher and higher requirements for power supply quality and reliability. By establishing a distribution network mainly based on ring networks, the power supply reliability can be effectively improved, the continuity of power supply can be ensured, and the impact of distribution equipment failures and maintenance outages can be reduced. In recent years, ring main units have been more and more widely used in the transformation of distribution networks.
[0003] Compared with centralized DTU (Data Transfer Unit), distributed DTU has the advantages of small occupied space, easy cooperation with primary switches, easy standardized design, simple installation, commissioning and replacement, small power outage range, single-point equipment failure only affecting one interval, and good anti-condensation effect, and is more and more widely used in complete sets of supplies.
[0004] In the prior art, multiple integrated measurement and control communication units are configured in each ring main unit, and a protection measurement and control unit is configured for each trunk line and branch line switch in each ring main unit. Each protection measurement and control unit is connected to a corresponding integrated measurement and control communication unit, and the multiple integrated measurement and control communication units are communicatively connected. There are multiple integrated measurement and control communication units, resulting in a high cost.
[0005] Therefore, in this patent application, the applicant has carefully studied an intelligent distributed power distribution automation terminal, a system and a method for judging faults thereof to solve the above problems. Summary of the Invention
[0006] Aiming at the deficiencies of the above prior art, the main purpose of the present invention is to provide an intelligent distributed power distribution automation terminal, a system and a method for judging faults thereof, which can quickly and accurately locate the voltage fault of a 10KV line with only one communication time synchronization management unit, without setting multiple communication time synchronization management units, reducing costs. Moreover, each functional unit is independently designed. Once a fault occurs, it can be replaced separately without affecting normal use; the entire fault judgment method can be carried out between terminals, and the determination of the fault point can be realized without relying on the master station system, improving the judgment efficiency.
[0007] To achieve the above purpose, the present invention adopts the following technical solutions: An intelligent distributed power distribution automation terminal includes The measurement and control protection unit is located inside the ring main unit and there are six of them. Each measurement and control protection unit is used for remote control, remote signaling and remote measurement of sectional switches, as well as sampling, calculation and fault indication of the voltage and current of the 10Kv line; The communication time synchronization management unit is used to manage the six measurement and control protection units and conduct peer-to-peer communication and protocol conversion between terminals; The power management unit is used for power supply; Each measurement and control protection unit is connected to the communication time synchronization management unit, and the communication time synchronization management unit is connected to a GPS / Beidou time synchronization system.
[0008] As a preferred solution, the clock synchronization signal of the measurement and control protection unit is timed by the communication time synchronization management unit, and the measurement and control protection unit adopts a dual operation system architecture of FPGA and MCU.
[0009] As a preferred solution, the communication time synchronization management unit has 8 100 / 10 BAST-T Ethernet ports, 4 RS232 / 485 ports, 3 positive remote signaling inputs, 2 remote control output interfaces and 1 DC sampling interface.
[0010] An intelligent distributed distribution automation system includes at least two terminals, peer-to-peer communication and protocol conversion between terminals, and the terminal is the intelligent distributed distribution automation terminal described above.
[0011] An intelligent distributed distribution automation fault discrimination method, which is based on the intelligent distributed distribution automation system described above, includes: Define the sectional switch where the fault current is detected as the target sectional switch, define the adjacent switch where the current flows into the target sectional switch as the first switch, and define the adjacent switch where the current flows out of the first sectional switch as the second switch; If the fault current is detected when the target sectional switch is in the closed state, judge whether the first switch or the second switch does not detect the fault current when in the closed state; If the first switch does not detect the fault current when in the closed state, the first fault point is between the target sectional switch and the first switch; If the second switch detects the fault current when in the closed state, the first fault point is between the target sectional switch and the first switch; If the first switch detects the fault current when in the closed state, the first fault point is on the main line where the current flows into the first switch; If the second switch does not detect the fault current when in the closed state, the first fault point is between the target sectional switch and the first switch; After the first fault point is isolated, the load of the non-fault area is supplied by another substation. If a second fault point appears and the original target sectional switch does not detect the fault current, judge whether the original first switch detects the fault current; If the original first switch detects a fault current, it is determined whether there is a branch switch between the original target sectionalizing switch and the original first switch; If there is a branch switch of another terminal, it is determined whether it has not detected a fault current. If so, the second fault point is at the connection of the original target sectionalizing switch, the original first switch and the branch switch.
[0012] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, mainly through the communication time synchronization management unit respectively connecting six measurement and control protection units in the same ring main unit and adding a GPS / Beidou time synchronization system, it can quickly and accurately locate the 10KV line voltage fault with only one communication time synchronization management unit, without setting multiple communication time synchronization management units, reducing costs. Moreover, each functional unit is independently designed. Once a fault occurs, it can be replaced separately without affecting normal use; the entire fault discrimination method can be carried out between terminals, and the determination of the fault point can be realized without relying on the master station system, improving the discrimination efficiency; Secondly, by adopting the FPGA and MCU dual operation system architecture in the measurement and control protection unit and simultaneously adopting high-speed pipelined AD sampling, high-speed sampling and big data operation processing are realized, greatly improving the discrimination efficiency and accuracy rate, and being beneficial to reducing misjudgment.
[0013] To more clearly elaborate the structural features and functions of the present invention, the following will be described in detail in combination with the accompanying drawings and specific embodiments. Brief Description of the Drawings
[0014] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic internal structure diagram of a single measurement and control protection unit of an embodiment of the present invention (showing the power management unit and the communication time synchronization management unit); Figure 3 is Figure 1 a magnified structural diagram of the measurement and control protection unit in Figure 4 is Figure 1 a magnified structural diagram of the communication time synchronization management unit in Figure 5 is Figure 1 a magnified structural diagram of the power management unit in Figure 6 is a schematic diagram of a distribution line fault of an embodiment of the present invention.
[0015] Explanation of the Reference Numerals in the Drawings: Communication time synchronization management unit 10, measurement and control protection unit 20, fault alarm manual reset button 21, remote / local dip switch 22, protection on / off dip switch 23, power management unit 30. Detailed implementation mode
[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation modes.
[0017] As Figures 1 to 6 shown, an intelligent distributed distribution automation terminal includes a measurement, control and protection unit 20, a communication time synchronization management unit 10 and a power management unit 30.
[0018] The measurement, control and protection unit 20 is located in the ring main unit and six are provided. In this embodiment, the six measurement, control and protection units 20, the communication time synchronization management unit 10 and the power management unit 30 are arranged side by side from left to right. The communication time synchronization management unit 10 is connected to a GPS / Beidou time synchronization system.
[0019] Each measurement, control and protection unit 20 is used for remote control, remote signaling and remote measurement of sectional switches, as well as sampling, calculation and fault indication of the voltage and current of the 10Kv line. In this embodiment, the clock synchronization signal of the measurement, control and protection unit 20 is timed by the communication time synchronization management unit 10, and the measurement, control and protection unit 20 adopts a dual-operation system architecture of FPGA and MCU.
[0020] Among them, the FPGA is a programmable array logic device FPGA, and its model is EG4A20BG256, and the model of the MCU is GD32H759IMK. The measurement, control and protection unit 20 adopts a high-speed pipelined AD (Shanghai Xinchi SC1154) with a sampling speed of up to 100M / S, realizing high-speed sampling and large-data volume operation processing. Each measurement, control and protection unit 20 cooperates with its corresponding sectional switch to realize sampling, calculation and fault indication of the voltage and current of the 10Kv line where it is located. The measurement, control and protection unit 20 realizes protection actions, isolation of fault sections, restoration of power supply to non-fault sections, and load transfer through closing operations on the corresponding sectional switches.
[0021] A fault alarm manual reset button 21, a remote / local dip switch 22 and a protection on / off dip switch 23 are arranged on the measurement, control and protection unit 20.
[0022] The fault alarm manual reset button 21 is used to manually reset the line fault alarm.
[0023] The purpose of the remote / local dip switch 22 is that when it is switched to the remote position, remote opening and closing operations can be realized, and when it is switched to the local position, local opening and closing operations can be realized.
[0024] The purpose of the protection on / off dip switch 23 is that when it is switched to the on position, the measurement, control and protection unit 20 can automatically perform protection logic topology calculation and automatically input protection, and when it is switched to the off position, the protection is withdrawn.
[0025] Schematic diagram of the interface definition of a measurement and control protection unit 20: Table 1
[0026] Table 1 is a list of the interface definitions of a measurement and control protection unit 20 disclosed in this embodiment. As shown in Table 1, it illustrates the function descriptions of 22 interfaces, 1 button, and two DIP switches.
[0027] Schematic diagram of the indication lamp description of a measurement and control protection unit 20: Table 2
[0028] Table 2 is a list of the indication lamp descriptions of a measurement and control protection unit 20 disclosed in this embodiment. As shown in Table 2, it illustrates the function descriptions of 12 indication lamps.
[0029] The communication time synchronization management unit 10 is used to manage six measurement and control protection units 20 and perform peer-to-peer communication and protocol conversion between terminals; each measurement and control protection unit 20 is connected to the communication time synchronization management unit 10.
[0030] In this embodiment, the communication time synchronization management unit 10 has 8 100 / 10 BAST-T Ethernet ports, 4 RS232 / 485 ports, 3 positive remote signal inputs, 2 remote control output interfaces, and 1 DC sampling interface.
[0031] The 3 positive remote signal inputs are respectively the positive input of the AC power failure remote signal, the positive input of the battery under-voltage remote signal, and the positive input of the battery activation status remote signal. The 2 remote control output interfaces are respectively the remote control battery activation start output interface and the remote control battery activation exit output interface.
[0032] Schematic diagram of the interface definition of a communication time synchronization management unit 10: Table 3
[0033] Table 3 is a list of the interface definitions of a communication time synchronization management unit 10 disclosed in this embodiment. As shown in Table 3, the 8 100 / 10 BAST-T Ethernet ports are respectively NET1 to NET8. 4 RS232 interfaces are adopted, which respectively correspond to RX1, RX2, RX3, RX4, TX1, TX2, TX3, TX4. Among them, 1 RX and 1 TX form 1 RS232 interface. The remote control battery activation start output interface has HK+ and HK- pins, and the remote control battery activation exit output interface has HG+ and HG- pins.
[0034] Schematic diagram of the indication lamp description of a communication time synchronization management unit 10: Table 4
[0035] Table 4 is a list of descriptions of the indicator lights of a communication time synchronization management unit 10 disclosed in this embodiment. As shown in Table 4, it illustrates the functional descriptions of 10 indicator lights.
[0036] The communication time synchronization management unit 10 is designed with an Arm Cortex-M7 32-bit MCU microprocessor and a real-time embedded operating system. It conducts data transmission and modeling for 6 measurement and control protection units 20 through corresponding high-speed Ethernet interfaces and pulse time synchronization interfaces, and realizes GPS / Beidou time synchronization, peer-to-peer communication between terminals, and protocol conversion upwards.
[0037] The power management unit 30 is used for power supply. The input power of the power management unit 30 is taken from a 10Kv line. After being stepped down and transformed by a power transformer, it provides the working power supply (AC220V / 110V) for the device. Inside, the voltages required for the terminal to work are generated through a power module and a DC / DC DC converter: a working 5V voltage, a communication +5V voltage, and a system +24V voltage.
[0038] Schematic diagram of the interface definition of a power management unit 30: Table 5
[0039] Table 5 is a list of descriptions of the interface definitions of a power management unit 30 disclosed in this embodiment. As shown in Table 5, it illustrates 1 power switch, 1 external DC 24V power input interface, and 1 external output DC 24V power output interface.
[0040] Among them, +24V and 24VG are respectively the power positive pole and power ground of the external DC 24V power input interface, and +24V* and 24VG* are respectively the power positive pole and power ground of the external output DC 24V power output interface.
[0041] Schematic diagram of the indicator light description of a power management unit 30: Table 6
[0042] Table 6 is a list of descriptions of the indicator lights of a power management unit 30 disclosed in this embodiment. As shown in Table 6, it illustrates the functional descriptions of 3 indicator lights.
[0043] An intelligent distributed distribution automation system includes at least two terminals, peer-to-peer communication and protocol conversion between terminals, and the terminal is the intelligent distributed distribution automation terminal described above.
[0044] An intelligent distributed distribution automation fault discrimination method, which is based on the intelligent distributed distribution automation system, includes: Define the sectionalizing switch that detects the fault current as the target sectionalizing switch, define the adjacent switch where the current flows into the target sectionalizing switch as the first switch, and define the adjacent switch where the current flows out of the first sectionalizing switch as the second switch; If the target sectionalizing switch detects the fault current in the closed state, determine whether the first switch or the second switch does not detect the fault current in the closed state; If the first switch does not detect the fault current in the closed state, the first fault point is between the target sectionalizing switch and the first switch; If the second switch detects the fault current in the closed state, the first fault point is between the target sectionalizing switch and the first switch; If the first switch detects the fault current in the closed state, the first fault point is on the main line where the current flows into the first switch; If the second switch does not detect the fault current in the closed state, the first fault point is between the target sectionalizing switch and the first switch; After the first fault point is isolated, the load of the non-fault area is supplied by another substation. If a second fault point appears and the original target sectionalizing switch does not detect the fault current, determine whether the original first switch detects the fault current; If the original first switch detects the fault current, determine whether there is a branch switch between the original target sectionalizing switch and the original first switch; If there is a branch switch of another terminal, determine whether it does not detect the fault current. If so, the second fault point is at the connection of the original target sectionalizing switch, the original first switch and the branch switch.
[0045] As Figure 6 shown, next, take the detection of the fault current at the K5 sectionalizing switch (at this time the K5 sectionalizing switch is closed) and the detection of the fault current at the K6 sectionalizing switch (at this time the K6 sectionalizing switch is closed) in the same terminal as an example to illustrate the principle ( Figure 6 in which F1, F2, F3, F4, F5, F6 are all fault points, K1, K2, K3, K4, K5, K6 are all sectionalizing switches, and L1 is the tie switch): 1. When the first switch is a sectionalizing switch: When the fault current is detected at the K5 sectionalizing switch (at this time the K5 sectionalizing switch is closed), at this time, If the fault current is not detected at the K6 sectionalizing switch (at this time the K6 sectionalizing switch is closed), the first fault point occurs at F1, that is, between the K5 sectionalizing switch and the K6 sectionalizing switch; If fault current is also detected at the K4 sectionalizing switch (when the K4 sectionalizing switch is in the closed position), then the first fault point occurs at F2, i.e., between the K5 sectionalizing switch and the K4 sectionalizing switch; If fault current is also detected at the K6 sectionalizing switch (when the K6 sectionalizing switch is in the closed position), then the first fault point occurs at F3.
[0046] 2. When the first switch is a tie switch: When fault current is detected at the K6 sectionalizing switch (when the K6 sectionalizing switch is in the closed position), at this time, if fault current is detected at the L1 tie switch (when the L1 tie switch is in the open position), then the first fault point occurs at F3.
[0047] It should be noted that if after the first fault point occurring at F6 is isolated, the load in the non-fault area is powered by another substation, and a second fault point appears. At this time, if fault current is detected at the K2 sectionalizing switch, and no fault current is detected at the K1 sectionalizing switch and the Kx sectionalizing switch of another terminal, then the second fault point occurs at F4.
[0048] The design key point of the present invention is that mainly through the communication time synchronization management unit respectively connecting six measurement and control protection units in the same ring main unit and adding a GPS / Beidou time synchronization system, it can realize the fast and accurate positioning of 10KV line voltage faults with only one communication time synchronization management unit, without the need to set multiple communication time synchronization management units, reducing costs. Moreover, each functional unit is independently designed. Once a fault occurs, it can be replaced separately without affecting normal use; the entire fault discrimination method can be carried out between terminals, and the determination of the fault point can be realized without relying on the master station system, improving the discrimination efficiency; Secondly, through the measurement and control protection unit adopting a dual-operation system architecture of FPGA and MCU, and at the same time adopting a high-speed pipelined AD sampling, high-speed sampling and large-data operation processing are realized, greatly improving the discrimination efficiency and accuracy, and being beneficial to reducing misjudgment.
[0049] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. An intelligent distributed distribution automation terminal, characterized in that: It includes Measurement and control protection units, six of which are located in the ring main unit. Each measurement and control protection unit is used for remote control, remote signaling and remote measurement of sectional switches, as well as sampling, calculation and fault indication of 10Kv line voltage and current; Communication time synchronization management unit, which is used to manage six measurement and control protection units and perform peer-to-peer communication and protocol conversion between terminals; Power management unit, which is used for power supply; Each measurement and control protection unit is connected to the communication time synchronization management unit, and the communication time synchronization management unit is connected to a GPS / Beidou time synchronization system.
2. The intelligent distributed power distribution automation terminal according to claim 1, wherein: The clock synchronization signal of the measurement and control protection unit is timed by the communication time synchronization management unit, and the measurement and control protection unit adopts a dual-operation system architecture of FPGA and MCU.
3. The intelligent distributed power distribution automation terminal according to claim 1, wherein: The communication time synchronization management unit has 8 100 / 10 BAST-T Ethernet ports, 4 RS232 / 485 ports, 3 positive remote signaling inputs, 2 remote control output interfaces and 1 DC sampling interface.
4. An intelligent distributed distribution automation system, characterized in that: It includes at least two terminals, and peer-to-peer communication and protocol conversion between terminals. The terminal is the intelligent distributed distribution automation terminal described in any one of claims 1 to 3.
5. An intelligent distributed distribution automation fault discrimination method, characterized in that: Based on the intelligent distributed distribution automation system described in claim 4, it includes: Define the sectional switch where the fault current is detected as the target sectional switch, define the adjacent switch where the current flows into the target sectional switch as the first switch, and define the adjacent switch where the current flows out of the first sectional switch as the second switch; If the target sectional switch detects a fault current in the closed state, judge whether the first switch or the second switch does not detect a fault current in the closed state; If the first switch does not detect a fault current in the closed state, then the first fault point is between the target sectional switch and the first switch; If the second switch detects a fault current in the closed state, then the first fault point is between the target sectional switch and the first switch; If the first switch detects a fault current in the closed state, then the first fault point is on the main line where the current flows into the first switch; If the second switch does not detect a fault current in the closed state, then the first fault point is between the target sectional switch and the first switch; After the first fault point is isolated, the load of the non-fault area is powered by another substation. If a second fault point appears and the original target sectional switch does not detect a fault current, then judge whether the original first switch detects a fault current; If the original first switch detects a fault current, then judge whether there is a branch switch between the original target sectional switch and the original first switch; If there is a branch switch of another terminal, then judge whether it does not detect a fault current. If so, the second fault point is at the connection of the original target sectional switch, the original first switch and the branch switch.