CN208445349U - A kind of power distribution network synthesis distribution terminal - Google Patents

Abstract

The utility model relates to a kind of power distribution network synthesis distribution terminals, comprising: feeder line acquisition control unit, synchronized phasor acquisition unit, electric energy quality monitoring unit, Ethernet exchanging unit, Data Centralized Processing unit and clock synchronization unit；Clock synchronization unit is respectively connected with Data Centralized Processing unit, feeder line acquisition control unit, synchronized phasor acquisition unit, electric energy quality monitoring unit to set time；Ethernet exchanging unit is connected with Data Centralized Processing unit by Ethernet interface；Feeder line acquisition control unit, synchronized phasor acquisition unit, electric energy quality monitoring unit are connected to carry out ethernet communication with Ethernet exchanging unit；Feeder line acquisition control unit, electric energy quality monitoring unit pass through SPI interface and are connected with synchronized phasor acquisition unit to carry out SPI communication.The utility model can be realized the synchronous acquisition to each node data of power distribution network, realize the supervisory control and data acquisition (SCADA) of Distribution Network Equipment, and carry out power quality on-line monitoring.

Description

An integrated distribution terminal of a distribution network

technical field

The utility model relates to the field of distribution network automation, in particular to an integrated distribution terminal of a distribution network.

Background technique

Distribution network automation terminal is the basic link to realize distribution automation, generally refers to feeder terminal equipment (FTU) used for distribution network monitoring, distribution transformer distribution terminal (TTU), remote monitoring terminal of switchgear and ring network cabinet (DTU). Its main function is to realize the monitoring and data acquisition of distribution network equipment, with remote signaling, telemetry, remote control, fault current detection, communication forwarding and fault diagnosis, isolation, positioning and recovery functions. Although the distribution network automation terminal has begun to play an important role in the intelligent distribution network, there are still many problems that need to be solved urgently.

Among them, the traditional distribution automation (remote) terminals have problems such as excessive data delay, insufficient boundary measurement, and inaccurate component parameters, which make the state estimation accuracy and real-time performance of the distribution network encounter great challenges. . At the same time, the traditional distribution automation remote terminal can only provide steady-state, asynchronous grid time period data, so that the upper substation or the central master station cannot grasp the dynamic information of the system in time and take measures. In addition, due to the limited accuracy of measurement data and the inconsistent time scale of traditional distribution automation remote terminals, the state of the power system can only be obtained by solving nonlinear equations using a large amount of redundant measurement data. The calculation time is relatively long, the real-time performance is poor, and it is impossible to Applied to the analysis of transient processes. In addition, the traditional distribution network automation terminal cannot realize the power quality monitoring function.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and propose a high-precision time-synchronized distribution network integrated distribution terminal, which can realize the synchronous acquisition of the data of each node of the distribution network, so as to obtain the accurate instantaneous profile of the entire network. state, realize the monitoring and data collection of distribution network equipment, and conduct online monitoring of power quality.

The technical scheme adopted by the utility model to solve its technical problems is:

An integrated distribution terminal of a distribution network, comprising: an integrated measurement and control module and a communication management module; the integrated measurement and control module includes a feeder acquisition control unit, a synchrophasor acquisition unit and a power quality monitoring unit; the communication management module includes a data centralized processing unit; the integrated measurement and control module further includes an Ethernet switching unit; the communication management module further includes a clock synchronization unit; The power quality monitoring units are respectively connected to perform time synchronization; the Ethernet switching unit and the data centralized processing unit are connected through an Ethernet port; the feeder acquisition control unit, the synchrophasor acquisition unit, and the power quality monitoring unit are all connected to the The Ethernet switching unit is connected to perform Ethernet communication; the feeder acquisition control unit and the power quality monitoring unit are both connected to the synchrophasor acquisition unit through an SPI interface to perform SPI communication.

Preferably, the integrated distribution terminal of the distribution network further includes an A/D conversion chip; the synchrophasor acquisition unit is connected with the A/D conversion chip to acquire AC analog quantities.

Preferably, the clock synchronization unit performs time synchronization based on GPS, Beidou, IEEE1588 and/or IRIG-B clocks.

Preferably, the clock synchronization unit is connected to the central data processing unit, the feeder acquisition control unit FTU, the synchrophasor acquisition unit PMU, and the power quality monitoring unit PQ through a serial interface and a second pulse interface respectively.

Preferably, a magnetic coupling isolator ADUM1200 is arranged between the clock synchronization unit and the centralized data processing unit, the feeder acquisition control unit FTU, the synchrophasor acquisition unit PMU, and the power quality monitoring unit PQ.

Preferably, both the feeder acquisition control unit and the power quality monitoring unit are connected to the Ethernet switching unit through an Ethernet port.

Preferably, the synchrophasor acquisition unit is connected to the Ethernet switching unit through a network interface chip having the function of SPI interface switching to a network port.

Preferably, the feeder acquisition control unit adopts a CPU with a model of STM32F407.

Preferably, the synchrophasor acquisition unit, the power quality monitoring unit and the clock synchronization unit all use a CPU with a model of STM32F427.

Preferably, the central data processing unit adopts a core board with a model of AM-335X.

The utility model has the following beneficial effects:

(1) The utility model has traditional FTU, DTU functions, can realize monitoring and data collection of distribution network equipment, has remote signaling, telemetry, remote control, fault current detection, communication forwarding and fault diagnosis, isolation, positioning and recovery functions At the same time, it has the function of online monitoring of power quality, and has the functions of synchronous monitoring and storage of voltage sag and short-term voltage interruption;

(2) The traditional distribution network automation terminals often use the simple network time protocol SNTP, and the highest synchronization accuracy that can be achieved is only in the millisecond level, which cannot meet the requirements of the active distribution network for real-time information time synchronization accuracy such as sampling values. The new model achieves sub-microsecond synchronization accuracy by adding four high-precision clock synchronization functions based on GPS/Beidou/IEEE1588/IRIG-B;

(3) The utility model realizes the synchronous acquisition of data of each node of the distribution network through the high-precision clock synchronous sampling technology, and monitors the basic parameters such as voltage, current, frequency, and phasor of the key nodes in the distribution network; The node data measured by the node has a consistent time standard. The data measured and calculated at different locations plus the corresponding time scale and angle are transmitted to the control center through the communication network, so as to obtain the precise state of the instantaneous profile of the entire network, which is used for power distribution. Network security loop control provides data support;

(4) The voltage and current synchronous measurement accuracy of the utility model reaches 0.2 level, the measurement error is less than 0.2% (traditional power distribution automation remote terminal is 0.5 level), has the functions of voltage sag and short-term voltage interruption synchronous monitoring and storage, and supports power distribution Synchronous monitoring of the entire network for grid voltage sags and short-term voltage interruptions;

(5) The utility model adopts the sampling data of 256 points per cycle, which has higher sampling accuracy than the 64 sampling points of the traditional power distribution automation remote terminal.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the overall structure diagram of the integrated distribution terminal of the distribution network according to the embodiment of the present invention;

Fig. 2 is the principle block diagram of the comprehensive measurement and control module of the embodiment of the present utility model;

FIG. 3 is a schematic block diagram of a clock synchronization unit according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Referring to FIG. 1 , the integrated distribution terminal of the distribution network according to the embodiment of the present invention includes: an integrated measurement and control module 10 and a communication management module 20; the integrated measurement and control module 10 includes a feeder acquisition control unit 101 and a synchrophasor acquisition unit 102 and the power quality monitoring unit 103; the communication management module includes a centralized data processing unit 201; the integrated measurement and control module 10 further includes an Ethernet switching unit 104; the communication management module further includes a clock synchronization unit 202; the clock synchronization The unit 202 is connected with the centralized data processing unit 201, the feeder acquisition control unit 101, the synchrophasor acquisition unit 102, and the power quality monitoring unit 103 respectively for time synchronization; the Ethernet switching unit 104 is connected with the centralized data processing unit 201 is connected through an Ethernet port; the feeder acquisition control unit 101, the synchrophasor acquisition unit 102, and the power quality monitoring unit 103 are all connected with the Ethernet switching unit 104 for Ethernet communication; the feeder acquisition control unit 101 The power quality monitoring unit 103 is connected with the synchrophasor acquisition unit 102 through the SPI interface for SPI communication; the data centralized processing unit communicates with the dispatch center 30 through the Ethernet port with the 104 protocol.

Specifically, the integrated measurement and control module 10 can be implemented by using three circuit boards, including: an integrated measurement and control board, a clock board, and a backplane.

Referring to Figure 2, the integrated measurement and control board includes three functional units: a feeder acquisition control unit 101, a synchrophasor acquisition unit 102, and a power quality monitoring unit 103. Each functional unit has an independent CPU, and also includes an Ethernet The switching unit 104 chip completes the communication between the three functional units and the centralized data processing unit 201 .

In this embodiment, the feeder acquisition control unit 101, the synchrophasor acquisition unit 102, and the power quality monitoring unit 103 each use one RS485 interface, one second pulse interface (timer capture pin), and use RS485 messages to revise the date, time, Minutes, seconds, seconds, pulses calibrate milliseconds and below clocks. Both RS485 and second pulse are magnetically isolated by ADUM1200. Specifically, the feeder acquisition control unit 101, the synchrophasor acquisition unit 102, and the power quality monitoring unit 103 receive the time synchronization information message sent by the clock synchronization unit 202 through RS485, and receive the clock synchronization unit 202 through the second pulse interface. Send the second pulse to synchronize the time to ensure the clock synchronization.

In this embodiment, the feeder acquisition control unit 101 adopts a CPU whose model is STM32F407. The feeder acquisition control unit 101 provides an SPI interface to complete the communication with the synchrophasor acquisition unit 102; the sampling point is changed from the original AD7606 acquisition to the synchrophasor acquisition unit 102 and then transmitted through SPI. The processing process after the control unit 101 receives the sampling point is consistent with the existing FTU. In addition, the feeder acquisition and control unit 101 also provides an Ethernet interface, and is connected to the Ethernet switch chip through the Ethernet interface to complete Ethernet communication with other units.

In this embodiment, the CPU used in the synchronous phasor acquisition unit 102 selects STM32F427 with 144 pins, which can satisfy 5 SPI interfaces. The five SPI ports are assigned as follows: communicate with feeder acquisition control unit 101--SPI1; communicate with power quality monitoring unit 103--SPI2; communicate with W5100 (extended Ethernet)--SPI3; communicate with two AD7606s--SPI4 \SPI5. In addition, the synchrophasor acquisition unit 102 reserves a high-speed network interface, uses the network port of the CPU itself, connects to the PHY chip, completes the SMV function, adopts the SMV and GOOSE protocols to realize the data transmission to the dispatch center 30, and adopts 256 points/cycle. Further, the synchrophasor acquisition unit 102 communicates with the Ethernet switching unit 104 (Ethernet switch chip) through an external expansion network port (W5100 chip). The two pieces of AD7606 are connected to the sampling signal of the AC board. One piece of AD7606 has 8 sampling channels, which can collect 8 AC analog quantities (Ua, Ub, Uc, Ia, Ib, Ic, Uo, Io) of a line, and another piece of AD7606 has 8 sampling channels. AD7606 can be used as a backup.

In this embodiment, the CPU used by the power quality monitoring unit 103 selects STM32F427 with 144 pins. The power quality monitoring unit 103 provides an SPI interface to complete the communication with the synchrophasor acquisition unit 102 . In addition, the power quality monitoring unit 103 also provides an Ethernet interface, and is connected to the Ethernet switch chip through the Ethernet interface to complete Ethernet communication with other units.

As described above, the Ethernet switching unit 104 (Ethernet switching chip) communicates with the feeder acquisition control unit 101, the synchrophasor acquisition unit 102 and the power quality monitoring unit 103, without using a network transformer, using capacitive coupling for communication, The switch chip has two network ports for external communication.

In this embodiment, the analog input includes three-phase voltages Ua, Ub, Uc, three-phase currents Ia, Ib, Ic, zero-sequence voltage Uo, and zero-sequence current Io, and the analog input acquisition adopts a 16-bit A/D conversion chip AD7606 , the sampling processing is completed by the processor of the synchrophasor acquisition unit 102, and the sampling rate is 256 points per wave.

In this embodiment, there are a total of 20 remote signaling outputs, which are connected to the processor of the feeder acquisition control unit 101, wherein the remote signaling resolution: ≤ 2 milliseconds, the remote signaling public power supply is 24V/48V adaptive, and the remote signaling de-jitter The time can be set, the setting range is 10~1000 milliseconds. 8 remote control outputs are connected to the processor of the feeder acquisition control unit 101, the relay output is a normally open contact, and the output capacity is DC 110V 5A or 220V 5A. The collection of ambient temperature and DC quantity is also completed by the feeder collection control unit 101 .

Specifically, the data collection and calculation method of the above data amount is as follows:

1) Using FFT algorithm (fast Fourier transform) to analyze and calculate the amplitude and effective value of voltage and current, calculate harmonics, voltage sag, short-term interruption, etc., so as to realize online monitoring of power quality;

2) Synchronous phasor measurement is to use high-precision GPS/Beidou satellite synchronous clock, IEE1588 or B code to achieve synchronous measurement of grid bus voltage and line current phasor, and transmit it to the control center of the grid through the communication system for use. Realize the whole network operation monitoring and control or realize the regional protection and control;

3) The basic algorithm of synchrophasor measurement is discrete Fourier transform (DFT transform), that is, the phasor is obtained by performing DFT transform on the sampling sequence of the input signal. Let the input signal sampling sequence be:

x _k =X _m cos(ωt+φ)

Among them, X _m is the signal amplitude, φ is the signal phase angle.

The DFT transformation formula is:

in, is the desired phasor.

To sum up, the CPU of the synchrophasor acquisition unit 102 is responsible for analog quantity acquisition, and the sampled data is transmitted to the feeder acquisition control unit 101 and the power quality monitoring unit 103 through the high-speed SPI bus. The feeder acquisition control unit 101 collects inputs such as remote signaling and remote control, and the related signals are sent to the synchrophasor acquisition unit 102 and the power quality monitoring unit 103 through the SPI bus. The Ethernet switch chip adopts a 5-port Ethernet switch chip. The feeder acquisition control unit 101, the synchrophasor acquisition unit 102 and the power quality monitoring unit 103 are each designed with an Ethernet port, and exchange data with the communication management module through Ethernet. Another Ethernet port of the synchrophasor acquisition unit 102 is designed for 61850 standard SMV and GOOSE message transmission.

3 is a schematic block diagram of the clock synchronization unit 202, the processor of the clock synchronization unit 202 is STM32F247, and the clock sources supported by this chip include GPS, Beidou, IEEE1588 and IRIG-B.

Specifically, the timekeeping unit of the clock synchronization unit 202 uses a constant temperature crystal oscillator, and when the external clock source is disconnected, the constant temperature crystal oscillator completes the guarding of the clock. When the power goes out, rely on lithium batteries or supercapacitors to be punctual.

Further, the time synchronization method of the clock synchronization unit 202 adopts the serial port message plus the second pulse, specifically: using the RS485 message to revise the date, hour, minute, second, second, and pulse to calibrate the clock in milliseconds and below. The output of the serial port sending part and the second pulse is isolated by the magnetic coupling ADUM1200 (same direction dual channel). Considering that each output of RS485 does not affect each other, each RS485 circuit uses a separate coupling and 485 chip.

In this embodiment, the centralized data processing unit 201 has six Ethernet ports and one RS232/485 communication port. One of the Ethernet ports uses the 104 protocol to schedule communication, and the other five Ethernet ports can be connected to five integrated measurement and control modules 10 .

The centralized data processing unit 201 mainly considers factors such as the harsh environment in which the device operates, performance requirements, and the like in the selection of the hardware platform. In this embodiment, AM335X is used as the core board, and its central processing unit is an ARM32-bit high-performance CPU with a main frequency of up to 1GHz; it has 512MB DDR3 RAM and 1GB Nand Flash; with an expandable SD card slot, the overall performance is very strong. Moreover, the core board has strong electromagnetic compatibility, environmental temperature and humidity adaptability, and strong stability, and can adapt to various harsh environments in which the project operates.

The core board adopts embedded linux system. Embedded linux is an operating system that cuts and modifies the Linux operating system so that it can run on an embedded computer. It has excellent performance and is suitable for a variety of CPUs and hardware platforms. Complete, supports the most commonly used protocols such as UDP and TCP/IP in the network, and also provides support for 10M, 100M, and Gigabit Ethernet networks, as well as wireless networks, Toker ring (Token Ring), optical fiber and even satellite support ; It is also an open source system with easy software porting, open code, many application software support, and short application product development cycle. In addition, the core board adds or subtracts the functions of program remote download, program remote start, sampled value data API (so), event information API (so) and switch output API (so).

In this embodiment, 8-channel 16-bit synchronous sampling A/D chip AD7606 is used for A/D conversion. This chip can truly support bipolar analog sampling, has analog input clamping protection function, and has oversampling hold and Digital filtering function to ensure the reliability and accuracy of sampling. Data exchange sampling high-speed SPI bus between A/D chip AD7606 and CPU.

In this embodiment, the data transmission between the A/D chip and the CPU processor is magnetically isolated. The remote signal input and remote control output both adopt the photoelectric isolation method, and the remote control output has hardware protection. The relays all use double-pole synchronous relays to support hardware action return nodes to ensure output reliability. The electrolytic capacitors, thermistors, varistors, chip capacitors, chip resistors, crystal oscillators, network chips, memory chips, optocouplers, relays, DC/DC isolated power supplies and other key components are all highly reliable industrial grade product.

In this embodiment, the feeder acquisition control unit is used to implement the function of a feeder terminal unit (FTU), the synchrophasor acquisition unit is used to implement the function of a synchrophasor measurement unit (PMU), and the power quality monitoring unit It is used to realize the function of power quality monitoring device (PQ).

Specifically, the functions of the feeder acquisition control unit specifically include:

a) Measurement functions, including:

Measure three-phase voltage (Va, Vb, Vc, Uab, Ubc, Uac) and zero-sequence voltage (Vx); measure three-phase current (zero-sequence current) Ia, Ib (I0) and Ic; measure frequency; calculate average current, Active, reactive, power factor, apparent power, phase angle and harmonics, etc.

b) Local/remote display functions, including:

Switch opening/closing position display; remote/local status display; grounding "lock" status display; grounding fault display; phase fault display; AC loss display; battery undervoltage display; battery activation display; battery management module fault display; DC12V Working power failure display; DC48V control power failure display;

c) Event recording function, including: SOE event recording; remote control event recording; telemetry cycle event recording; system operation log recording.

The functions of the synchrophasor acquisition unit specifically include:

a) Synchronization: With an accurate synchronization clock signal (such as GPS) as the benchmark of the sampling process, there is a definite and unified phase relationship between the phasors of each remote node. The phasor measurement can use the second pulse signal of the synchronous clock to synchronize the sampling pulse of the device, and the synchronization error of the sampling pulse should not be greater than ±1μs;

b) Real-time: Under the support of high-speed communication system, various data can be transmitted to multiple master stations in real time, and corresponding commands from each master station can be received;

c) High speed: with high-speed internal data bus and external communication interface, it can meet the measurement, storage and external transmission of a large amount of real-time data;

d) High precision: with high enough measurement accuracy, A/D selects 16 bits, and the phase shift of the signal generated in the measurement process of the device must be compensated. The measurement accuracy of the device includes the accuracy of amplitude and phase angle;

e) Select voltage and current transformers with angular difference less than 0.1 degrees and high precision, and fully consider the influence of phase shift in hardware circuit design;

f) Real-time measurement and display of three-phase fundamental wave voltage phasor, three-phase fundamental wave current phasor, fundamental wave positive sequence voltage phasor, fundamental wave positive sequence current phasor, active power, reactive power, system frequency, switching status ;

g) can receive synchronous clock signals and PPS pulse signals from other devices;

h) The communication protocol with the master station complies with the requirements of "GB/T 26865.2-2011 Power System Real-time Dynamic Monitoring System Part 2: Data Transmission Protocol";

i) Dynamic data recording function;

j) Fault recording: save 10 sets of recording information, 1S before the fault, 2S after the fault, and store the sampling data at 128 points per wave. The memory required for 3 seconds of data is: the memory required for each set of wave recording data: 128 *(3000/20)*8*2=3072000 bytes, that is, 3 megabytes of memory is required, and 10 sets of wave recording data are 30Mbytes of memory.

Regarding the disturbance recorder: The communication requirement conforms to the output data model specification of COMTRADE. See Appendix B of "DL/T553-2013 General Technical Conditions for Dynamic Recording Devices of Power Systems".

k) Data storage: realized by 32GTF card.

The comprehensive distribution terminal of the utility model has a high sampling rate, and after the distributed deployment, the time of each acquisition unit is synchronized, and the distributed power quality analysis is performed on the acquisition node through each acquisition unit, and the voltage swell is analyzed. Real-time calculation of sag, voltage fluctuation and flicker, amplitude of high-order harmonics, frequency jitter, etc., provides rich data for fault location, power quality optimization, and harmonic control of distribution network, and provides large-scale power distribution. The reliability and self-healing of the network provide original and accurate data, which provides the prerequisites for the reliability, self-healing and governance of the distribution network, and can meet the technical requirements of the future development of active distribution networks for terminal equipment.

The utility model is an integrated power distribution terminal for a power distribution network, which can monitor and record dynamic data in real time after fault disturbance, can predict the stability of the power distribution network, and provide corresponding control strategies to prevent insufficient control strategies when sudden faults occur. When it is predicted that the distribution network will lose its transient stability, emergency measures can be taken on the distribution network according to a predetermined plan to prevent the system from collapsing.

The comprehensive distribution terminal of the utility model can obtain high-precision real-time data of the system, so that the state estimation can be transformed from a large-scale nonlinear calculation problem to a linear estimation algorithm, which not only greatly improves the accuracy of the state estimation, but also greatly shortens the The calculation time is more conducive to real-time analysis and calculation and transient process control.

The principles and implementations of the present utility model are described with specific embodiments in the present utility model, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present utility model; meanwhile, for those skilled in the art , according to the idea of the present utility model, there will be changes in the specific implementation and application scope. To sum up, the content of this specification should not be construed as a limitation to the present utility model.

Claims (10)

1. An integrated power distribution terminal for a distribution network, comprising: an integrated measurement and control module and a communication management module; the integrated measurement and control module includes a feeder acquisition control unit, a synchrophasor acquisition unit and a power quality monitoring unit; the communication management module includes A centralized data processing unit; it is characterized in that, the integrated measurement and control module further includes an Ethernet switching unit; the communication management module further includes a clock synchronization unit; the clock synchronization unit is connected with the centralized data processing unit, the feeder acquisition control unit, The synchrophasor acquisition unit and the power quality monitoring unit are respectively connected to perform time synchronization; the Ethernet switching unit is connected with the data centralized processing unit through an Ethernet port; the feeder acquisition control unit, the synchrophasor acquisition unit, the power The quality monitoring unit is connected with the Ethernet switching unit for Ethernet communication; the feeder acquisition control unit and the power quality monitoring unit are both connected with the synchrophasor acquisition unit through the SPI interface for SPI communication. 2. The integrated distribution terminal of the distribution network according to claim 1, wherein the integrated distribution terminal of the distribution network further comprises an A/D conversion chip; the synchrophasor acquisition unit and the A/D conversion The chip is connected to collect the AC analog quantity. 3 . The integrated power distribution terminal of the power distribution network according to claim 1 , wherein the clock synchronization unit performs time synchronization based on GPS, Beidou, IEEE1588 and/or IRIG-B clocks. 4 . 4 . The integrated power distribution terminal of the power distribution network according to claim 1 , wherein the clock synchronization unit, the centralized data processing unit, the feeder acquisition control unit FTU, the synchrophasor acquisition unit PMU, the power quality monitoring The unit PQ is connected through a serial interface and a second pulse interface respectively. 5 . The integrated power distribution terminal of the power distribution network according to claim 4 , wherein the clock synchronization unit, the data centralized processing unit, the feeder acquisition control unit FTU, the synchrophasor acquisition unit PMU, the power quality monitoring unit Magnetic isolators are arranged between the unit PQs. 6 . The integrated distribution terminal of a distribution network according to claim 1 , wherein the feeder acquisition control unit and the power quality monitoring unit are both connected to the Ethernet switching unit through an Ethernet port. 7 . 7 . The comprehensive power distribution terminal of a power distribution network according to claim 1 , wherein the synchrophasor acquisition unit is connected to the Ethernet switching unit through a network interface chip having the function of an SPI interface to transfer a network port. 8 . 8 . The integrated power distribution terminal of the power distribution network according to claim 1 , wherein the feeder acquisition control unit adopts a CPU with a model of STM32F407. 9 . 9 . The integrated distribution terminal of a distribution network according to claim 1 , wherein the synchronous phasor acquisition unit, the power quality monitoring unit and the clock synchronization unit all use a CPU with a model of STM32F427. 10 . 10 . The integrated power distribution terminal of the power distribution network according to claim 1 , wherein the centralized data processing unit adopts a core board with a model of AM-335X. 11 .