Distributed photovoltaic energy storage grid-connected simulation practical training device

Abstract

The utility model relates to the technical field of electric power training, and discloses a distributed photovoltaic energy storage grid-connected simulation practical training device, which comprises a plurality of cabinet bodies, a wire inlet main switch, a public power grid electrification indicating lamp I, a power supply and load side two-way meter, a meter front isolating knife switch of the power supply and load side two-way meter, a residual network access public power grid access terminal strip, a user load indicating lamp and a user load side three-phase residual current operated circuit breaker are arranged in the cabinet body I on the right side; and a meter front isolation knife switch of the power supply and load side bidirectional meter. According to the distributed photovoltaic energy storage grid-connected simulation practical training device, a photovoltaic grid-connected system is divided into three parts, namely a load and power supply system, a grid-connected system and a power generation system through different panels, so that the composition and property right demarcation point of each system can be clearly seen, and students can master the composition, working principle and acceptance precautions of the grid-connected system more clearly and quickly; and safe operation of personnel and equipment is ensured.

Description

Technical Field

[0001] This application relates to the field of power training technology, specifically a distributed photovoltaic energy storage grid-connected simulation training device. Background Technology

[0002] Electricity training is an important way to improve the professional skills, management capabilities, and safety awareness of employees in the power industry. The target audience for electricity training mainly includes various employees in the power industry, such as power engineering technicians, managers, and operators. These personnel need to continuously improve their professional skills and knowledge to adapt to the needs of the rapid development of the power industry.

[0003] Many existing training devices in China generally use two methods for practical training: one is to build on a real photovoltaic system, and the other is to use a schematic diagram.

[0004] (1) The main disadvantages of establishing a real photovoltaic system are as follows:

[0005] a. Costs are too high

[0006] The cost of installing a 1W photovoltaic system is around 8 yuan, while installing a 3KVA grid-connected photovoltaic system would cost around 24,000 yuan.

[0007] b. Photovoltaic panel installation occupies a large amount of space.

[0008] Solar panels are typically installed on outdoor rooftops. A single solar panel is not sufficient to meet grid connection requirements; multiple panels must be used in combination to achieve this. (See Solar Panel Rooftop Installation)

[0009] C. The grid connection application process is cumbersome.

[0010] If grid connection is required, an application must be submitted to the local power supply company. The power supply company will then issue an acceptance plan. Only after the plan is approved can grid connection installation and commissioning proceed. After commissioning is completed, the power supply company will need to conduct acceptance testing.

[0011] d. The installation period is relatively long.

[0012] It generally takes about 45 days from application to the start of installation, and installation takes about 10 days, so the development cycle is relatively long.

[0013] e. Because real components are used, some faults in the field cannot be simulated;

[0014] (2) The use of schematic diagrams has the following main disadvantages.

[0015] a. It can only keep trainees' understanding of photovoltaic grid connection at the theoretical level;

[0016] b. Since the components used are all shells and there are no actual components inside, it is impossible to conduct an electrical test.

[0017] C. The system cannot simulate the sunlight on-site, resulting in trainees not learning a comprehensive range of knowledge. Utility Model Content

[0018] To address the shortcomings of existing technologies, this application provides a distributed photovoltaic energy storage grid-connected simulation training device, which has advantages such as improved practicality and solves the problems mentioned in the background technology.

[0019] To achieve the above objectives, this application provides the following technical solution: a distributed photovoltaic energy storage grid-connected simulation training device, comprising multiple cabinets. The cabinet on the right side contains an incoming main switch, a public grid energized indicator light, bidirectional meters for both power supply and load sides, a pre-meter isolating switch for the bidirectional meters for both power supply and load sides, a terminal block for connecting the surplus grid to the public grid, a user load indicator light, a three-phase residual current circuit breaker for the user load side, a pre-meter isolating switch for the bidirectional meters for both power supply and load sides, a post-meter isolating switch for the surplus grid connection circuit, a unidirectional meter for the surplus grid connection, a simulated dummy meter tail, a dedicated grid-connected switch for the surplus grid connection circuit, and a three-phase circuit breaker for the surplus grid connection circuit.

[0020] The cabinet in the middle contains the following components: 1. Public power grid live indicator light; 2. Public power grid wiring terminals; 3. Isolation switch before the full-grid meter; 4. Bidirectional meter for full-grid use; 5. Simulated meter tail; 6. Isolation switch after the full-grid meter; 7. Surge protector for the full-grid circuit; 8. Grid-connected dedicated switch for the full-grid circuit; 9. Three-phase circuit breaker for the full-grid circuit; 10. Meter for users with surplus capacity not connected to the grid; 11. Isolation switch before the meter with surplus capacity not connected to the grid; 12. Surge protector for the surplus capacity not connected to the grid; 13. Grid-connected inverter for the surplus capacity not connected to the grid; 14. Power acquisition unit for the surplus capacity not connected to the grid; 15. Solar MPPT controller for the surplus capacity not connected to the grid; 16. Positive fuse for the energy storage battery in the surplus capacity not connected to the grid; 17. Lead-out terminals for the energy storage battery in the surplus capacity not connected to the grid; 18. Positive fuse for the energy storage battery in the surplus capacity not connected to the grid; 19. Charging button for the energy storage battery in the surplus capacity not connected to the grid.

[0021] The cabinet on the left contains an integrated photovoltaic grid-connected energy storage training device, solar photovoltaic panels, fluorescent lamp sockets, a dimming knob, photovoltaic voltage measurement points, buttons to add or remove components, inverter output phase A voltmeter, inverter output phase B voltmeter, inverter output phase C voltmeter, inverter output phase A ammeter, inverter output phase B ammeter, inverter output phase C ammeter, and grounding terminals for each system.

[0022] The cabinet is equipped with a residual current circuit breaker with a margin of safety for the mains circuit. The circuit breaker can monitor the current changes in the circuit in real time. Once the current exceeds the preset threshold (such as in the case of overload or short circuit), it can cut off the circuit in a very short time (usually within a few milliseconds), effectively preventing equipment damage and safety accidents such as fires.

[0023] The cabinet is equipped with a backup circuit breaker after the meter. The circuit breaker can detect abnormal currents in the circuit in a timely manner, such as overload or short circuit, and quickly disconnect the circuit to prevent fault current from causing damage to equipment and personnel.

[0024] The cabinet is equipped with a surge protector for the power supply circuit. The surge protector can effectively absorb and suppress voltage surges, preventing them from entering electrical equipment and thus protecting the equipment from damage.

[0025] The cabinet on the right is equipped with a three-phase residual current circuit breaker for the backup power supply circuit. The circuit breaker can quickly sense changes in the current in the circuit. When the current exceeds the preset threshold, it can cut off the circuit in a very short time to prevent the fault from escalating further.

[0026] The cabinet on the right is equipped with a three-phase circuit breaker for the user load side. The three-phase circuit breaker can protect the three-phase circuit at the same time, ensuring that the current can be cut off in time when overload, short circuit or other faults occur in the circuit, so as to prevent damage to the circuit and equipment.

[0027] The cabinet on the right has a simulated meter tail installed inside. Since the simulated meter tail does not involve actual current or voltage measurement, it will not be affected by electromagnetic fields.

[0028] The cabinet on the left houses a three-phase simulated inverter. Compared to a single-phase inverter, a three-phase inverter has a higher output voltage, thus enabling it to drive higher-power appliances. This feature gives the three-phase simulated inverter a significant advantage in applications requiring high power output.

[0029] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0030] This distributed photovoltaic energy storage grid-connected simulation training device divides the photovoltaic grid-connected system into three main parts: load and power supply system, grid-connected system, and power generation system through different panels. The composition of each system and the property boundary point can be clearly seen, enabling trainees to more clearly and quickly grasp the composition, working principle, and acceptance precautions of the grid-connected system, ensuring the safe operation of personnel and equipment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this application;

[0032] Figure 2 Workflow for this application Figure 1 ;

[0033] Figure 3 Workflow for this application Figure 2 ;

[0034] Figure 4 Workflow for this application Figure 3 ;

[0035] Figure 5 Workflow for this application Figure 4 ;

[0036] Figure 6 Workflow for this application Figure 5 ;

[0037] Figure 7 Workflow for this application Figure 6 ;

[0038] Figure 8 Workflow for this application Figure 7 ;

[0039] Figure 9 Workflow for this application Figure 8 ;

[0040] Figure 10 Workflow for this application Figure 9 ;

[0041] Figure 11 Workflow for this application Figure 10 ;

[0042] Figure 12 This is a schematic diagram of the overall structure of this application.

[0043] In the picture:

[0044] 1. Main incoming switch; 2. Public power grid energized indicator light 1; 3. Bidirectional meters on the power supply and load sides; 4. Isolating switch before the bidirectional meters on the power supply and load sides; 5. Terminal block for connecting surplus power to the public power grid; 6. Simulated dummy meter tail 1; 7. User load indicator light; 8. Three-phase circuit breaker on the user load side; 9. Three-phase residual current operated circuit breaker on the user load side; 10. Isolating switch before the meter used in the surplus power grid connection circuit; 11. Isolating switch after the meter used in the surplus power grid connection circuit; 12. Unidirectional meter used in the surplus power grid connection; 13. Simulated dummy meter tail 2; 14. Three-phase surplus power grid connection circuit. 15. Residual current operated circuit breaker; 16. Surge protector for surplus grid connection circuit; 17. Grid-connected dedicated switch for surplus grid connection circuit; 18. Three-phase circuit breaker for surplus grid connection circuit; 19. Public power grid live indicator light 2; 20. Public power grid terminal block; 21. Isolating switch before full grid connection meter; 22. Bidirectional meter for full grid connection; 23. Simulated dummy meter tail 3; 24. Isolating switch after full grid connection meter; 25. Surge protector for full grid connection circuit; 26. Grid-connected dedicated switch for full grid connection circuit; 27. Three-phase circuit breaker for full grid connection circuit; 28. Meter for user with surplus but not connected to the grid; 29. ​​Meter with surplus but not connected to the grid. 29. Isolating switch before grid connection; 30. Circuit breaker after grid connection for non-grid connection; 31. Surge protector for non-grid connection circuit; 32. Grid-connected dedicated switch for non-grid connection circuit; 33. Residual current operated circuit breaker for non-grid connection circuit; 34. Grid-connected inverter in non-grid connection system; 35. Power acquisition unit in non-grid connection system; 36. Solar MPPT controller in non-grid connection system; 37. Positive fuse for energy storage battery No. 1 in non-grid connection system; 28. Lead-out terminals of energy storage batteries No. 1 and No. 2 in non-grid connection system; 39. Residual current... 40. Battery charging button for the off-grid system; 41. Integrated photovoltaic grid-connected energy storage training device; 42. Solar photovoltaic panel; 43. Fluorescent lamp socket; 44. Dimming knob; 45. Photovoltaic voltage measurement point; 46. Add component button; 47. Remove component button; 48. Inverter output A-phase voltmeter; 49. Inverter output B-phase voltmeter; 50. Inverter output C-phase voltmeter; 51. Inverter output A-phase ammeter; 52. Inverter output B-phase ammeter; 53. Inverter output C-phase ammeter; 54. Three-phase simulation inverter; 55. Grounding terminals in each system; 56. Cabinet. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Please see Figure 1 As shown in Figure 1, the distributed photovoltaic energy storage grid-connected simulation training device in this embodiment includes multiple cabinets 55. The cabinet on the right side 55 is equipped with an incoming main switch 1, a public grid energized indicator light 2, a bidirectional meter for the power supply and load side 3, a pre-meter isolating switch 4 for the bidirectional meter for the power supply and load side 4, a public grid access terminal block for the surplus grid connection 5, a user load indicator light 7, a three-phase residual current circuit breaker 9 for the user load side, a pre-meter isolating switch 4 for the bidirectional meter for the power supply and load side 4, a post-meter isolating switch 11 for the surplus grid connection circuit, a unidirectional meter for the surplus grid connection 12, a simulated dummy meter tail 2 13, a grid-connected dedicated switch for the surplus grid connection circuit 16, and a three-phase circuit breaker for the surplus grid connection circuit 17.

[0047] Please see Figure 1 As shown, the cabinet 55 located in the middle is equipped with the following components: a public power grid live indicator light 18, a public power grid terminal block 19, a full-grid meter pre-connection isolating switch 20, a bidirectional meter for full-grid connection 21, a simulated meter tail 3 22, a full-grid meter post-connection isolating switch 23, a full-grid circuit surge protector 24, a full-grid circuit grid-connection dedicated switch 25, a full-grid circuit three-phase circuit breaker 26, a residual non-grid user meter 27, a residual non-grid meter pre-connection isolating switch 28, and a residual meter... 30. Surge protector for off-grid circuit; 31. Grid-connected dedicated switch for off-grid circuit with surplus capacity; 33. Grid-connected inverter in off-grid system with surplus capacity; 34. Power harvester in off-grid system with surplus capacity; 35. Solar MPPT controller in off-grid system with surplus capacity; 36. Positive terminal fuse for energy storage battery No. 1 in off-grid system with surplus capacity; 37. Lead-out terminals for energy storage batteries No. 1 and No. 2 in off-grid system with surplus capacity; 28. Positive terminal fuse for energy storage battery No. 2 in off-grid system with surplus capacity; 39. Charging button for energy storage battery in off-grid system with surplus capacity.

[0048] Please see Figure 1 As shown, the cabinet on the left (55) houses an integrated photovoltaic grid-connected energy storage training device (40), solar photovoltaic panels (41), fluorescent lamp sockets (42), a dimming knob (43), a photovoltaic voltage measurement point (44), an add component button (45), a remove component button (46), an inverter output A-phase voltmeter (47), an inverter output B-phase voltmeter (48), an inverter output C-phase voltmeter (49), an inverter output A-phase ammeter (50), an inverter output B-phase ammeter (51), an inverter output C-phase ammeter (52), and grounding terminals (54) for each system. Different panels divide the photovoltaic grid-connected system into three main parts: the load and power supply system, the grid-connected system, and the power generation system. The composition and ownership boundaries of each system are clearly visible, allowing trainees to more clearly and quickly grasp the composition, working principle, and acceptance precautions of the grid-connected system, ensuring the safe operation of personnel and equipment.

[0049] Please see Figure 1 As shown, the cabinet 55 is equipped with a residual current circuit breaker 32 for non-mainstream circuits. The circuit breaker can monitor the current changes in the circuit in real time. Once the current exceeds the preset threshold, such as in the case of overload or short circuit, it can cut off the circuit in a very short time, usually within a few milliseconds, effectively preventing equipment damage and safety accidents such as fires. The cabinet 55 is also equipped with a residual current circuit breaker 29 for non-mainstream meters. The circuit breaker can detect abnormal currents in the circuit in a timely manner, such as overload or short circuit, and quickly cut off the circuit to prevent fault current from causing damage to equipment and personnel. The cabinet 55 is also equipped with a surge protector 15 for mainstream circuits. The surge protector can effectively absorb and suppress voltage surges to prevent them from entering electrical equipment, thereby protecting the equipment from damage.

[0050] Please see Figure 1 As shown, the right-side cabinet 55 houses a three-phase residual current circuit breaker 14 with a margin for the mains circuit. This circuit breaker can quickly sense changes in the circuit current and, when the current exceeds a preset threshold, can disconnect the circuit in a very short time to prevent further escalation of the fault. The right-side cabinet 55 also houses a user load-side three-phase circuit breaker 8. This three-phase circuit breaker can simultaneously protect the three-phase circuit, ensuring that in the event of overload, short circuit, or other faults, the current can be cut off in a timely manner to prevent damage to the circuit and equipment. The right-side cabinet 55 also houses a simulated meter tail 6. Since the simulated meter tail 6 does not involve actual current or voltage measurement, it is not affected by electromagnetic interference. The left-side cabinet 55 houses a three-phase simulated inverter 53. Compared to a single-phase inverter, the three-phase inverter has a higher output voltage, thus enabling it to drive higher-power appliances. This feature gives the three-phase simulated inverter 53 a significant advantage in applications requiring high power output.

[0051] The distributed photovoltaic energy storage grid-connected simulation training device in this embodiment divides the photovoltaic grid-connected system into three main parts: load and power supply system, grid-connected system, and power generation system through different panels. The composition and ownership demarcation points of each system can be clearly seen, enabling trainees to more clearly and quickly grasp the composition, working principle, and acceptance precautions of the grid-connected system, ensuring the safe operation of personnel and equipment.

[0052] The working principle of the above embodiments is as follows: According to Figure 2 As shown; when the computer needs to set an inverter fault, the computer sends the display content to the LCD screen via Ethernet, and the LCD displays the content according to the received content; simulates the inverter anti-islanding failure, and simulates the inverter working under normal grid voltage conditions;

[0053] according to Figure 3As shown; Using a full-feed internet connection method, under no fault settings, the three-phase power supply flows through KM2, KM7, main switch QF1 to grounding switch, live indicator, pre-meter isolating switch, bidirectional meter, post-meter circuit breaker QF2, automatic reclosing circuit breaker QF3, surge protector QF4, three-phase leakage circuit breaker QF5, and three-phase general circuit breaker QF6. When QF1 and QF2 are both closed, and the virtual load power supply voltage rises, QF3 will automatically close. With QF5 and QF6 closed, the public grid indicator light illuminates, and the inverter output voltage monitoring instrument displays the three-phase output voltage; the inverter's anti-islanding function is simulated normally.

[0054] When QF1 is disconnected to simulate a power grid outage, the automatic reclosing circuit breaker QF3 will automatically trip because no voltage is detected at its upper end. After the trip, there will be no voltage indication on the inverter output voltage monitoring instrument; the inverter's anti-islanding function will fail.

[0055] according to Figure 4 As shown; when the inverter's anti-islanding function fails during computer-controlled configuration, the computer controls the K1 relay of the fault simulator to engage. After K1 engages, the KM2 coil is energized. After KM2 engages, the power supply connected to QF1 is disconnected, and the power supply to the inverter output input side QF6-1 is connected. To prevent the inverter output voltage from being connected to the upper end of the automatic reclosing circuit breaker through the lower end of the automatic reclosing circuit breaker when the automatic reclosing circuit breaker QF3 has not tripped, causing the automatic reclosing circuit breaker to fail to trip, after KM2 engages, a time relay is connected to the normally open contact of KM2. Utilizing the time delay function of the time relay KT, KM3 is activated, allowing KM3 to connect to QF6-1. At this time, the inverter's output voltage monitoring instrument shows voltage output. The automatic reclosing circuit breaker QF3 assumes that the mains power at the upper end has been cut off, so it will automatically trip, achieving the goal of mains power failure, automatic reclosing circuit breaker tripping, and the virtual inverter having voltage output; grid-connected dedicated circuit breaker failure.

[0056] according to Figure 5 , 6 As shown; if the software sets the dedicated grid-connected circuit breaker to fail, the software controls the K2 of the fault simulator to engage. After K2 engages, KM4 engages, and KM4 short-circuits the upper and lower ends of the dedicated grid-connected circuit breaker. When the inverter function is set to fail and the dedicated grid-connected circuit breaker fails, the virtual load power supply will connect the voltage to the grid indicator light through the inverter. This is used to simulate that after the inverter fails and the dedicated grid-connected circuit breaker fails simultaneously, the inverter voltage can still be transmitted to the public grid. When personnel are inspecting, although the main switch QF1 of the public grid is disconnected, there will still be voltage in the grid, which may cause personal injury or death, thus drawing the attention of trainees; surge protector grounding fault simulation;

[0057] according to Figure 7As shown; when the computer sets a leakage fault, the computer controls relays K3, K4, and K5 through the fault simulator to set leakage current relative to A, B to ground, and C to ground, respectively. After the leakage fault is set, the leakage circuit breaker QF5 will trip due to the detected leakage current, thus ensuring the safety of the equipment; load switching simulation technology.

[0058] To better simulate the user load on site, a load current monitoring instrument is installed on the device. When the load switch is closed, the load current monitoring instrument monitors the load current. When the load switch is open, the load current is 0.

[0059] Meanwhile, since the remaining balance is connected to the grid when the load switch is disconnected, it is equivalent to the full amount being connected to the grid. In order to demonstrate the operation of the bidirectional meter when the load switch is disconnected while the remaining balance is connected to the grid, certain technical means are used to monitor the load switch in real time.

[0060] according to Figure 8 , 9 As shown in Figure 10; When the load circuit breaker is closed, the time relay KT is energized. After a delay after KT is energized, KM6 is energized. The current passes through the current monitoring instrument to the three-phase meter, and then returns from the meter to the low end of the current. At this time, there is current in the three-phase meter, and the three current monitoring instruments also have current, indicating that the current user load circuit breaker is in the closed state.

[0061] When the user load circuit breaker is in the open state, KM6 does not engage, and the high end of the current circuit is directly connected to the low end of the current circuit through the normally closed contact of KM6. At this time, there is no current in the current monitoring instrument and the user meter, which is used to simulate the situation where the user has no load.

[0062] Because the inverter output voltage is slightly higher than the mains voltage, when there is no load on the user side, the surplus grid connection will become the full grid connection mode. Since the wiring methods of full grid connection and surplus grid connection are different, a computer is needed to set the current flow of the bidirectional meter for surplus grid connection.

[0063] according to Figure 11 As shown; when the circuit breaker is open, KM6 is open. At this time, the normally closed contact of KM6 is used to ground the detection terminal of the fault simulation box. After the fault simulator detects the grounding signal, it automatically uploads the detection result to the computer. If it is low level, the computer controls the bidirectional meter of the residual grid connection to set the current reverse connection fault. The residual grid connection mode is simulated as the full grid connection mode through the current reverse connection fault.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0065] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A distributed photovoltaic energy storage grid-connected simulation training device, comprising a plurality of cabinet bodies (55), characterized in that: The right side of the cabinet (55) one inside installation has incoming line total gate (1), public power grid electrified indicator light one (2), power supply and load side's two-way metering table (3), power supply and load side two-way metering table's table front isolation gate knife (4), the access terminal row (5) of the rest of the network on the public power grid access, user load indicator light (7), user load side three-phase residual current operating circuit breaker (9), power supply and load side two-way metering table's table front isolation gate knife (4), the rest of the network on the loop using the table rear isolation knife gate (11), the rest of the network using one-way metering table (12), analog false table tail two (13), the rest of the network loop grid connection special switch (16), the rest of the network loop three-phase circuit breaker (17); The middle cabinet (55) is internally installed with public power grid electrified indicator light two (18), public power grid wiring terminal (19), full amount of net metering table front isolation knife gate (20), full amount of net using two-way metering table (21), analog false table tail three (22), full amount of net metering table rear isolation knife gate (23), full amount of net loop surge protector (24), full amount of net loop grid connection special switch (25), full amount of net loop three-phase circuit breaker (26), rest of the network without net user table (27), rest of the network without net table front isolation knife (28), rest of the network without net loop surge protector (30), rest of the network without net loop grid connection special switch (31), rest of the network without net system inverter (33), rest of the network without net system power collector (34), rest of the network without net system solar MPPT controller (35), rest of the network without net system energy storage No. 1 battery positive pole fuse (36), rest of the network without net system energy storage No. 1, No. 2 battery lead terminal (37), rest of the network without net system energy storage No. 2 battery positive pole fuse (28), rest of the network without net system energy storage battery charging button (39); The left side cabinet (55) is internally installed with photovoltaic grid-connected energy storage practical training all-in-one machine (40), solar photovoltaic panel (41), fluorescent lamp socket (42), dimmer knob (43), photovoltaic voltage measuring point (44), increase component button (45), decrease component button (46), inverter output A-phase voltmeter (47), inverter output B-phase voltmeter (48), inverter output C-phase voltmeter (49), inverter output A-phase ammeter (50), inverter output B-phase ammeter (51), inverter output C-phase ammeter (52), ground terminal (54) in each system.

2. The distributed photovoltaic energy storage grid-connected simulation training device according to claim 1, characterized in that: The cabinet (55) is internally installed with rest of the network without net loop residual current operating circuit breaker (32).

3. The distributed photovoltaic energy storage grid-connected simulation training device according to claim 1, characterized in that: The cabinet (55) is internally installed with rest of the network without net table rear circuit breaker (29).

4. The distributed photovoltaic energy storage grid-connected simulation training device according to claim 1, characterized in that: The cabinet (55) is internally installed with rest of the network loop surge protector (15).

5. The distributed photovoltaic energy storage grid-connected simulation training device according to claim 1, characterized in that: The right side of the cabinet (55) is internally installed with rest of the network loop three-phase residual current operating circuit breaker (14). 6.The distributed photovoltaic energy storage grid-connected simulation training device according to claim 1, characterized in that: The right side cabinet (55) is installed with the cabinet (55) internally installed with user load side three-phase circuit breaker (8).

7. The distributed photovoltaic energy storage grid-connected simulation training device according to claim 1, characterized in that: The right side of the cabinet (55) is internally mounted with a simulation of the watch tail (6). 8.The distributed photovoltaic energy storage grid-connected simulation training device according to claim 1, characterized in that: The left side of the cabinet (55) is internally mounted with a three-phase simulation inverter (53).

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