CN203881876U - Modularized and integrated system for dynamic simulation and terminal detection of power distribution network - Google Patents

Abstract

The utility model discloses a modularized and integrated system for dynamic simulation and terminal detection of a power distribution network. Under a condition of satisfying a similarity criterion of an electric power system, a 400V low-voltage device is used for simulating an actual device of a 10kV power distribution network according to a principle of proportional reduction of a capacity so that a series of modularized power distribution network device simulators are designed. According to the researched actual 10kV power distribution line, a corresponding power distribution network simulating system is established through a simulation configuration screen. A transient state operation characteristic and a steady state operation characteristic of the power distribution network are recorded and researched by means of simulation of a normal operation, a power-cut and power-transmission operation, a power fluctuation and a grounding or short-circuit failure in different grounding mode of the power distribution network. In addition, by means of the system, a feeder automated motion and a treating process can be simulated and functions and performances of a power distribution automated switch controller can be tested.

Description

An integrated system for dynamic simulation and terminal testing of modular distribution network

technical field

The utility model relates to an integrated system of dynamic simulation and terminal testing of a modular distribution network.

Background technique

The distribution network is an important part of the power grid and a key link to control and ensure the reliability and quality of power supply for users. Compared with power transmission and transformation, the grid design, operation monitoring and experimental research of my country's distribution network are obviously behind, and it is the weakest link in the construction of my country's modern power grid. In recent years, with a large number of distributed new energy sources, micro-grids and diversified loads connected to the distribution network, the traditional distribution network has changed from a passive network to an active network, and the power flow has changed from unidirectional to multi-directional. The operating characteristics, protection and control strategies are becoming more and more complex. Due to the complexity of the operating characteristics of the distribution network, it is necessary to carry out physical simulation test research while carrying out theoretical analysis and digital simulation, and the three are indispensable. Distribution network dynamic simulation is an important means to analyze power system characteristics, test relay protection and secondary equipment. The dynamic simulation test of the distribution network can be carried out on the prototype (10kV) line, or on the equivalent low-voltage model (generally 380-1000V). In addition, the distribution network dynamic simulation system is also an online test platform for the function and performance of distribution automation terminals. Distribution automation system is an important means to improve the reliability of power supply, which consists of primary equipment, distribution terminals, communication network and master station system. The power distribution automation system realizes remote monitoring and control of power distribution primary equipment through power distribution terminals. There are many manufacturers and product models of power distribution terminals, and they operate in outdoor environments. The detection and control of product quality is very important. However, at present, the test joint debugging of the electric automation system can only be carried out on the on-site 10kV distribution network. There are few test items, high risk and low efficiency, and it is impossible to effectively detect the deficiencies and defects of the distribution automation system.

Utility model content

In order to solve the above problems, the utility model proposes a modular distribution network dynamic simulation and terminal testing integrated system, which comprehensively considers the research on the dynamic characteristics of the distribution network and the testing needs of the distribution automation master station system and terminals, and provides It provides a basic platform for studying the transient characteristics of the distribution network, analyzing the faults of the distribution equipment, and conducting distribution automation tests.

In order to achieve the above object, the utility model adopts the following technical solutions:

An integrated system for dynamic simulation and terminal testing of a modular distribution network, including an analog configuration screen, a power supply module, a line module, a switch module, a load and reactive power compensation module, a distributed power supply module, a fault generator simulation module and a power distribution Terminal module; among them, the analog configuration screen is connected to the power supply module, line module, switch module, load and reactive power compensation module, distributed power supply module, fault generator simulation module and power distribution terminal module; each module includes several different simulators , the analog configuration screen is connected to the incoming and outgoing lines of all simulators from the back or side of the screen.

The power module includes a three-phase programmable AC power supply, a transformer simulator and a transformer grounding unit simulator; the three-phase programmable AC power supply has a capacity of 30kVA, and the voltage, frequency and initial phase are adjustable, and the voltage of each phase is adjustable Range 0-300V, power frequency adjustable range 45-65Hz.

The transformer grounding unit simulator is connected to the neutral point tap of the three-phase transformer through a built-in switch, and can simulate neutral point non-grounding, small resistance grounding or arc suppressing coil grounding, and different grounding modes can be changed by manual operation.

The line module includes an outlet circuit breaker, an overhead line simulator, a cable line simulator and a cable branch line simulator.

The outlet circuit breaker is connected to the outlet of the three-phase transformer, with a rated current of 63A, which can be opened and closed manually or remotely, and has complete protection functions, including quick-break protection, time-limited quick-break protection, and overcurrent protection.

The switch module includes a voltage-type switch simulator, a current-type switch simulator, a ring network cabinet simulator and a boundary switch simulator.

The load and reactive power compensation module includes a three-phase programmable load simulator and a reactive power compensation simulator; the three-phase programmable load simulator is a three-phase isolation transformer using a dry-type transformer with a transformation ratio of 400V/400V ,The capacity is 30kVA; the neutral point tap leads out, and the connection mode of "Yy" or "Yd" can be selected.

The power distribution terminal module includes a protection measurement and control device, a voltage-type switch controller, a current-type switch controller, a ring network cabinet controller and a boundary switch controller;

The fault generator module includes a three-phase programmable fault generator, and the distributed power supply module includes a distributed power supply simulator; the input terminal of the three-phase programmable fault simulator is equipped with a manual circuit breaker with a delay input relay, Manual input fault, fault duration can be set, simulate various types of distribution line faults: including phase-to-phase short circuit, three-phase short circuit, single-phase ground fault, two-phase ground fault and three-phase ground fault, each short circuit is equipped with current limiting Resistor with a current limit of 30A, the device can be controlled remotely or locally, with programmable settings and automatic switching of fault types.

The voltage-type switch simulator is used for simulating the voltage-type sectional switch, which can be opened and closed by manual remote control; the voltage-type sectional switch is equipped with A, B, and C three-phase CTs, and the CT ratio is 10:5; the switching power supply side and the load AB and BC phase-to-phase PTs are installed on the side, and the output voltage of the PT secondary side is AC220V, which is used as the voltage acquisition signal and the external power supply of the controller.

The beneficial effects of the utility model are:

1. It can be combined to simulate the actual 10kV distribution line, and realize the programmable setting of power fluctuation, load curve and fault type. It can be used in the laboratory to study the steady state and transient characteristics of the distribution network, as well as the online test of the distribution automation terminal. High scalability and flexibility;

2. According to the actual 10kV power distribution line studied, the corresponding distribution network simulation test system is combined through the simulation configuration screen, and the normal operation, power supply stop operation, power fluctuation, and grounding of the distribution network are simulated under different grounding methods. or short-circuit faults, record and study the transient and steady-state operating characteristics of the distribution network; in addition, the system can simulate the automatic action and processing of the feeder, and test the function and performance of the distribution automation switch controller.

Description of drawings

Fig. 1 is the system composition structure schematic diagram of the present utility model;

Fig. 2 is the wiring diagram of simulating two substations and two hand-in-hand lines of the present invention.

Among them, 1. Analog configuration screen, 2. Power supply module, 3. Line module, 4. Switch module, 5. Load and reactive power compensation module, 6. Distributed power supply module, 7. Fault generator, 8. Power distribution terminal , 9. Three-phase programmable AC power supply, 10. Transformer simulator, 11. Transformer grounding unit simulator, 12. Outgoing circuit breaker, 13. Overhead road simulator, 14. Cable line simulator, 15. Cable branch line simulation 16. Voltage-type switch simulator, 17. Current-type switch simulator, 18. Ring main unit simulator, 19. Boundary switch simulator, 20. Three-phase programmable load simulator, 21. Reactive power compensation simulator , 22. Distributed power supply simulator, 23. Three-phase programmable fault simulator, 24. Fault recorder, 25. Protection measurement and control device, 26. Voltage-type switch simulator, 27. Current-type switch simulator, 28. Ring network cabinet controller, 29. Demarcation switch controller.

Detailed ways:

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, the utility model adopts the following technical scheme. The integrated system of distribution network dynamic simulation and distribution automation test consists of a simulation configuration screen 1, a power module 2, a line module 3, a switch module 4, loads and reactive power Compensation module 5, distributed power supply module 6, fault generator 7 and power distribution terminal 8 are composed. The power module 2 is composed of a three-phase programmable AC power supply, a transformer simulator, and a transformer grounding unit simulator; the line module 3 is composed of an outlet circuit breaker, an overhead line simulator, a cable circuit simulator 14, and a cable branch circuit simulator 15; the switch module 4 is composed of a voltage-type switch simulator 16, a current-type switch simulator 17, a ring main unit simulator 18, and a boundary switch simulator 19; the load and reactive power compensation module 5 is composed of a three-phase programmable load Composed of simulator 20 and reactive power compensation simulator 21; distributed power supply module 6 is composed of distributed power supply simulator; fault generator 7 module is composed of three-phase programmable fault generator; power distribution terminal 8 module is composed of protection measurement and control device, voltage Type switch controller, current type switch controller, ring network cabinet controller, boundary switch controller.

The analog configuration screen 1 is connected to the inlet and outlet lines of all simulators from the back or side of the screen body, respectively connected to the integrated three-phase jack on the front panel of the configuration screen, and each simulator is connected through the three-phase plug connection line. The free combination of connection modes can simulate distribution lines with different wiring modes, and different access positions of load and reactive power compensation module 5, distributed power supply module 6, and fault generator 7 modules on distribution lines.

The three-phase programmable AC power supply 9 has a capacity of 30kVA, adjustable voltage, frequency and initial phase, and can be input and exited by remote control. The adjustable range of each phase voltage is 0-300V, and the adjustable range of power frequency is 45-65Hz. It has the ability to withstand the impact of short-term fault current; it has self-protection ability and can automatically cut off the power supply when the current is too large.

The three-phase transformer simulator 10 is a three-phase isolation transformer, using a dry-type transformer with a transformation ratio of 400V/400V and a capacity of 30kVA; the neutral point tap is drawn out, and the connection mode "Yy" or "Yd" can be selected. It has the ability to withstand the impact of short-term fault current and self-protection.

The transformer grounding unit simulator 11 is composed of resistance, reactance and capacitance to form an RLC load, and its resistance, reactance and capacitance parameters are adjustable. The transformer grounding unit is connected to the neutral point tap of the three-phase transformer through a built-in switch, which can simulate neutral point non-grounding, small resistance grounding or arc suppressing coil grounding, and different grounding modes are controlled by manual operation.

The outlet circuit breaker 12 of the substation simulates the outlet circuit breaker of the 10kV line of the substation, and is connected to the outlet of the three-phase transformer with a rated current of 63A, which can be opened and closed manually or remotely. The outlet circuit breaker is equipped with a protection measurement and control device, and has complete protection functions, including quick-break protection, definite time-limit quick-break protection, and overcurrent protection.

The overhead line simulator 13 simulates a three-phase aluminum overhead insulated line with a length of 2 km and a cross-sectional area of 240 mm ² , which adopts RLC series-parallel design, with a rated current of 30A and a short-circuit capacity of 100-250A.

The cable line simulator 14 simulates a three-phase copper cable line with a length of 1 km and a simulated cross-sectional area of 240 mm ² , adopting an RLC series-parallel design with a rated current of 30A and a short-circuit capacity of 100-250A.

The cable branch line simulator 15 simulates a three-phase copper cable line with a length of 0.5 km and a simulated cross-sectional area of 120 mm. It adopts an RLC ^series -parallel design with a rated current of 15A and a short-circuit capacity of 50-120A.

The voltage-type sectional switch simulator 16 simulates a voltage-type sectional switch, which can be opened and closed by manual remote control. The voltage-type sectional switch is equipped with A, B, and C three-phase CTs, and the CT ratio is 10:5; AB and BC phase-to-phase PTs are installed on the switching power supply side and the load side, and the output voltage of the PT secondary side is AC220V, which is used as a voltage acquisition signal and control The external power supply of the device. The voltage-type sectional switch has the characteristics of "incoming call hold, no-voltage release". When one end of the switch is charged, the closing circuit of the voltage-type switch controller outputs AC220V, which keeps the voltage-type sectional switch closed. When the controller When the output voltage of the closing circuit is less than AC80V (when there is no voltage in the line or a short-circuit fault occurs), the voltage-type sectional switch is automatically separated. The supporting controller of the voltage-type sectional switch simulator is a voltage-type sectional switch controller, and the voltage-type sectional switch and its controller are connected through a communication cable.

The current type sectional switch 17 simulates the current type sectional switch of the distribution network, and its supporting controller is a current type controller, and the simulator and the controller are connected through a communication cable. AB and BC phase-to-phase PTs are installed on the power supply side and load side of the current-type section switch as the voltage acquisition signal and external power supply for the controller. The PT ratio is 380/220, the secondary side output voltage is 220V, and the capacity is 200VA. The section switch at the head end of the line is only connected to the AB phase PT on the power supply side. Configure A, B, C three-phase CT, CT transformation ratio 10:5.

The boundary switch simulator 19 simulates a user boundary switch, which can be opened manually or remotely, but can only be closed manually. The matching controller is a boundary switch controller, which is connected with the boundary switch simulator through an aviation plug and a cable. Configure A, C phase and zero-sequence CT, CT transformation ratio 10:1; BC interphase PT is installed on the switching power supply side, and the output voltage of the PT secondary side is AC220V, which is used as the voltage acquisition signal and the external power supply of the controller.

The ring network cabinet simulator 18 simulates a 2-in, 2-out ring network cabinet, and is composed of 2 incoming line switches, 2 outgoing line switches and a common bus. The incoming line switch collects A, B, and C three-phase current, the outgoing line switch collects A, C phase and zero-sequence current, and the busbar collects three line voltages. The supporting controller of the ring network cabinet simulator is the ring network cabinet controller.

The three-phase programmable load simulator 20 adopts a programmable RLC simulation device, the simulator power is adjustable from 0 to 6kVA, has self-protection capability, and is installed in groups of screens. Resistive load, capacitive load, and inductive load are independently adjustable, and the resistive, inductive, and capacitive parts can be freely combined; the active power, reactive power, and power factor absorbed by the analog load device can be adjusted in static or steady state; at the same time, it can be adjusted according to The pre-set load characteristics or load forecast curves fluctuate in different phases at different time points. Through remote control or manual control, single-phase, two-phase or three-phase loads can be switched to simulate the unbalanced three-phase load of the distribution network. Resistive load: single-phase: 0.1KW, 0.2kw, 0.3KW, 0.4kw total 1kw, three-phase total 3KW. Inductive load: single-phase: 0.1KVA, 0.2KVA, 0.3KVA, 0.4KVA total 1KVA, three-phase total 3KVA. Capacitive load: single-phase: 0.1KVA, 0.2KVA, 0.3KVA, 0.4KVA total 1KVA, three-phase total 3KVA. With parameter measurement function, it can test the loaded voltage, current, active power, reactive power, power factor, three-phase unbalance, harmonic and other parameters.

The reactive power compensation simulator 21 has a compensation capacity of 0-3kVar, is adjustable in phases and groups, is connected in parallel or in series, and has the ability to withstand short-term fault current impacts and self-protection.

The distributed power simulator has an adjustable capacity of 0-6kW and is composed of a DC programmable power supply and a three-phase grid-connected inverter. It can simulate the output characteristics of various DGs and grid-connected control strategies, active power, reactive power and harmonics It can be adjusted and fluctuates at different time points of the set output prediction curve, and has the ability to withstand short-term fault current impact and self-protection. Test the power grid with new energy access, and when the grid fails, the impact of the self-protection characteristics of new energy access on the power grid.

The input terminal of the three-phase programmable fault simulator is equipped with a manual circuit breaker with a delay input relay, and the fault is manually activated, and the fault duration can be set. It can simulate various types of distribution line faults: including phase-to-phase short circuit, three-phase short circuit, single-phase grounding, two-phase grounding, three-phase grounding and other faults. Each short-circuit circuit is equipped with a current-limiting resistor with a current-limiting value of 30A. The device can be controlled remotely or locally, with programmable settings and automatic conversion of fault types.

The fault recorder calculates the parameters such as voltage and current of the monitored point during the operation of the distribution network through high-speed sampling. When the system fails or oscillates (short circuit, grounding, system oscillation, frequency collapse, voltage collapse, etc.), the The data acquisition waveform before and after the fault moment is recorded.

The above distribution network equipment simulators all adopt a modular design, the main wiring in and out is a three-phase plug interface, the analog switch controller has built-in PT and CT, and the internal state acquisition of each simulator and the external interface of the control loop are unified.

The working method of the integrated system of modular distribution network dynamic simulation and distribution terminal testing: this scheme can simulate multiple distribution lines outgoing from multiple substations to form a small distribution network to simulate the dynamic operation characteristics of the distribution network and testing of power distribution terminals. The three-phase programmable AC power supply is used as a superior power supply point, connected to the transformer simulator, and the transformer grounding unit simulator can simulate various neutral point grounding methods such as neutral non-grounding, arc-suppression coil grounding, and small resistance grounding. . The outlet circuit breaker simulates the outlet switch of the substation and is connected to the outlet side of the transformer simulator. The distribution line is connected by multiple overhead line simulators and cable line simulators through switch simulators (including voltage switch simulators, current switch simulators, and ring network cabinet simulators) to form simulated overhead lines, cable lines or Mixed overhead and cable lines. The three-phase programmable load simulator, as a user load, is connected to the power distribution line through the boundary switch for simulating the user load. The three-phase programmable fault simulator is connected according to preset fault points, and can simulate various distribution line faults. The power distribution terminal is connected with corresponding section switch simulators, ring network cabinet simulators and boundary switch simulators. The fluctuation of the external power supply of the distribution network is simulated by the three-phase programmable AC power supply, and the load curve is preset by the three-phase programmable load simulator to simulate various load fluctuation situations. The three-phase programmable fault simulator can simulate fault types such as single-phase grounding, two-phase grounding, two-phase grounding short circuit, three-phase grounding and three-phase grounding short circuit of the distribution network. After the fault type is preset, Start the malfunction by remote operation. By changing the load and fault conditions of the simulated distribution network, the real-time monitoring and protection functions of the distribution terminal are tested.

As shown in Figure 2, the integrated system of modular distribution network dynamic simulation and distribution terminal testing simulates two substations: station A and station B, and there are two outgoing lines from station A, namely 1# overhead line and 2# overhead line ; There are 2 outgoing lines from station B, which are respectively 1# cable line and 2# cable line. The analog power supply systems of station A and station B are composed of a three-phase programmable AC power supply 9, a transformer simulator 10, and a transformer grounding unit simulator 11, respectively.

The 1# overhead line starts from the outlet circuit breaker 12 of station A, and is connected successively by 4 overhead line simulators and 4 voltage-type switch simulators. Each voltage-type switch simulator is equipped with a voltage-type switch controller 26, 1# The first three voltage-type switch simulators of the overhead line are in the closed position during normal operation, and the last voltage-type switch simulator is used as a contact switch with the 1# cable line, and it is in the off position during normal operation.

The 2# overhead line starts from the outlet circuit breaker 12 of station A, and is connected successively by 4 overhead line simulators and 4 current-mode switch simulators. Each current-mode switch simulator is equipped with a current-mode switch controller 27, 2# The first three current-type switch simulators of the overhead line are in the closed position during normal operation, and the last current-type switch simulator is used as a contact switch with the 2# cable line, and is in the off position during normal operation.

The 1# cable line starts from the outlet circuit breaker 12 of station B, and consists of 3 cable line simulators and 2 ring network cabinet simulators. Each ring network cabinet simulator is equipped with a ring network cabinet controller 28, and the ring network cabinet The two incoming line switches of the controller are in the closed position during normal operation, and the two outgoing line switches are set as required.

The 2# cable line starts from the outlet circuit breaker 12 of station B, and consists of 3 section cable line simulators and 2 ring network cabinet simulators. Each ring network cabinet simulator is equipped with a ring network cabinet controller, and the ring network cabinet controls The two incoming line switches of the device are in the close position during normal operation, and the two outgoing line switches are set as required.

1# overhead line and 1# cable line use a voltage-type switch simulator as a contact switch to form a hand-in-hand line; 2# overhead line and 2# cable line use a current-type switch simulator as a contact switch to form a hand-in-hand line.

Four three-phase programmable load simulators 29 are respectively connected to 2 overhead lines and 2 cable lines through boundary switches 19 and cable branch line simulators 15 to simulate distribution network load changes. 1 local reactive power compensation simulator 21 is connected to 2# overhead line; 2 distributed energy generation simulators 22 are respectively connected to 1# and 2# overhead lines, which are used to simulate the access pair of low-power distributed new energy generation impact on the distribution network.

Two three-phase programmable fault simulators 23 are respectively connected to 2# overhead line and 1# cable line to simulate grounding and short-circuit faults of distribution lines. The two three-phase programmable fault simulators can simulate power distribution sequentially or simultaneously Two concurrent or secondary faults on the line. The two fault recording devices 24 are respectively connected to the voltage and current signals of the overhead line and the cable line, and can record the voltage and current waveforms of the distribution line during normal operation and faults at different frequencies.

Under the condition of satisfying the similarity criterion of the power system, the utility model uses 400V low-voltage equipment to simulate the actual equipment of the 10kV distribution network according to the principle of proportionally reducing the capacity, and designs a series of modular distribution network equipment simulators. Based on the actual 10kV distribution line wiring situation studied, a distribution network simulation test system consistent with the actual distribution line is combined.

As shown in Figure 2, the utility model simulates two hand-in-hand lines in the distribution network. The 1# overhead line and the 1# cable line are connected through the voltage switch 9; the 2# overhead line and the 2# cable line are connected through the current type switch 13 connection. The three-phase programmable AC power supply 9, the transformer simulator 10, the transformer grounding unit simulator 11, and the outlet circuit breaker 12 form a power supply system, simulating the upper substation of the distribution line. The three-phase programmable AC power supply 9 can simulate changes in power supply, voltage amplitude, frequency and phase angle through programming or manual adjustment. The transformer grounding unit simulator can simulate different grounding methods such as ungrounded distribution lines, arc suppression coil grounding or direct grounding. The outlet circuit breaker 12 and its protection, measurement and control device 25 have three-stage overcurrent protection functions.

The three-phase programmable load simulator 20 is connected to the distribution network through the boundary switch simulator 19 and the cable branch line simulator 15, and the user load curve can be programmed to simulate the change of the distribution line load. The three-phase programmable fault simulator 20 can be connected to any end node of an overhead line simulator, a cable line simulator or a cable branch line simulator. After a preset grounding or short-circuit fault, the fault can be enabled by remote or manual remote control. The reactive power compensation simulator 21 can control the switching of large-capacity associated capacitors inside the reactive power compensation simulator according to the voltage of the monitored node to perform on-site reactive power compensation. The distributed energy generation simulator 22 can set voltage and current output curves according to the energy output and adjustment characteristics of new energy generation such as wind power and photovoltaics, and simulate the grid-connected operation of distributed new energy generation and distribution network.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (10)

1. An integrated system of modular distribution network dynamic simulation and terminal testing, characterized by: including a simulation configuration screen, a power supply module, a line module, a switch module, a load and reactive power compensation module, a distributed power supply module, and a fault occurrence device simulation module and power distribution terminal module; among them, the simulation configuration screen connects power supply module, line module, switch module, load and reactive power compensation module, distributed power supply module, fault generator simulation module and power distribution terminal module; each module includes There are several different simulators, and the analog configuration screen is connected to both ends of all simulators from the back or side of the screen. 2. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 1, characterized in that: said power supply module includes a three-phase programmable AC power supply, a transformer simulator and a transformer grounding unit simulation device; the capacity of the three-phase programmable AC power supply is 30kVA, the voltage, frequency and initial phase are adjustable, the adjustable range of each phase voltage is 0-300V, and the adjustable range of power frequency is 45-65Hz. 3. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 2, characterized in that: the transformer grounding unit simulator is connected to the neutral point tap of the three-phase transformer through a built-in switch , it can simulate neutral point non-grounding, small resistance grounding or arc suppressing coil grounding, and different grounding modes can be changed by manual operation. 4. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 2, characterized in that: the line module includes an outgoing line circuit breaker, an overhead line simulator, a cable line simulator and a cable Branch line simulator. 5. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 2, characterized in that: said outlet circuit breaker is connected to said three-phase transformer outlet, rated current is 63A, and can be manually or remotely controlled On-off, with complete protection functions, including quick-break protection, definite time limit quick-break protection and over-current protection. 6. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 1, characterized in that: the switch module includes a voltage-type switch simulator, a current-type switch simulator, a ring main unit Simulators and Demarcation Switch Simulators. 7. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 1, characterized in that: said load and reactive power compensation module includes a three-phase programmable load simulator and reactive power compensation Simulator; the three-phase programmable load simulator is a three-phase isolation transformer, which adopts a dry-type transformer with a transformation ratio of 400V/400V and a capacity of 30kVA; the neutral point tap leads out, and the connection mode of "Yy" or "Yd" can be selected . 8. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 1, characterized in that: the distribution terminal module includes a protection measurement and control device, a voltage-type switch controller, a current-type switch controller, ring network cabinet controller and boundary switch controller. 9. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 1, characterized in that: said fault generator module includes a three-phase programmable fault generator, and said distributed power supply module includes Distributed power supply simulator; the input terminal of the three-phase programmable fault simulator is equipped with a manual circuit breaker with a delay input relay, and the fault is manually activated, and the fault duration can be set to simulate various types of distribution line faults: including Phase-to-phase short circuit, three-phase short circuit, single-phase grounding, two-phase grounding and three-phase grounding faults, each short circuit is equipped with a current limiting resistor, the current limiting value is 30A, the device can be controlled remotely or locally, programmable settings and automatic conversion Fault type. 10. A modular distribution network dynamic simulation and terminal testing integrated system as claimed in claim 6, characterized in that: said voltage-type switch simulator is used to simulate voltage-type sectional switches, which can be divided manually and remotely A, B, and C three-phase CTs are configured on the voltage-type segmental switch, and the CT ratio is 10:5; AB and BC phase-to-phase PTs are installed on the switching power supply side and the load side, and the output voltage of the PT secondary side is AC220V, which is used as a voltage acquisition signal and controller external power supply.