Distributed photovoltaic active power distribution network experiment system

Abstract

The invention discloses a distributed photovoltaic active power distribution network experiment system, and the system comprises a power supply unit which comprises a photovoltaic power distribution network and an active power distribution network, and the photovoltaic power distribution network and the active power distribution network are connected with an experiment platform through a power switching unit. The experimental platform comprises a dynamic model experimental area and a real model demonstration field area, and the dynamic model experimental area is in network connection with the real model demonstration field area; the power supply switching unit comprises a first input end, a second input end and a power supply output end, the photovoltaic power distribution network and the active power distribution network are respectively connected with the first input end and the second input end through power supply lines, and the power supply output end is connected with the power supply input end of the experiment platform; power is supplied through a distributed photovoltaic system, the influence of environmental factors on the roof photovoltaic power generation condition and the power generation conditions of photovoltaic modules made of different materials under different conditions can be detected, and the starting, running and grid-connected processes of a photovoltaic power station can be simulated and verified.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic distribution network experimental systems, and in particular to a distributed photovoltaic active distribution network experimental system. Background Art

[0002] Power companies often carry out transformation of various power grid projects. Project transformation not only solves various problems encountered in power work, but also verifies the rationality and advancement of various new distribution network networks and new technologies, thereby improving the safety and efficiency of the distribution network.

[0003] At present, the platform contains a multi-state scenario reproduction and verification system platform for high-proportion distributed photovoltaic active distribution networks, which mainly includes various types of rooftop photovoltaic equipment, photovoltaic simulation power supply equipment, high-precision controllable RLC simulation loads, etc. After the transformation and construction, the platform can carry out research on the impact of high-proportion photovoltaic access on distribution network protection and fault self-healing, and verify new technologies, explore the criteria for distributed photovoltaic access to distribution networks, and then form relevant standards.

[0004] During the verification of this distributed photovoltaic active distribution network, it is necessary to connect the distribution network formed by the photovoltaic equipment and the existing active distribution network to the experimental platform respectively, and perform line switching through the power supply line switching device, and then conduct comparative experiments to verify the target functions and parameters; however, the existing power switching device cannot achieve the expected effect well when switching frequently, and there is a risk of leakage.

[0005] Therefore, it is urgent to design a distributed photovoltaic active distribution network experimental system to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a distributed photovoltaic active distribution network experimental system.

[0007] In view of this, the first aspect of the present application provides a distributed photovoltaic active distribution network experimental system, the system comprising:

[0008] A power supply unit (10), an experimental platform (20) and a power switching unit (30);

[0009] The power supply unit (10) comprises: a photovoltaic power distribution network (11) and an active power distribution network (12), and the photovoltaic power distribution network (11) and the active power distribution network (12) are respectively connected to the experimental platform (20) via a power switching unit (30);

[0010] The experimental platform (20) includes: a dynamic model experimental area (21) and a real model demonstration area (22), and the dynamic model experimental area (21) and the real model demonstration area (22) are connected by a network;

[0011] The power switching unit (30) comprises: a first input end (31), a second input end (32) and a power supply output end (33); the photovoltaic power distribution network (11) and the active power distribution network (12) are respectively connected to the first input end (31) and the second input end (32) via power supply lines (L); and the power supply output end (33) is connected to the power supply input end of the experimental platform (20).

[0012] Optionally, the photovoltaic distribution network (11) comprises: a photovoltaic module array (11a), a photovoltaic combiner box (11b), a DC power distribution cabinet (11c), a photovoltaic grid-connected inverter (11d) and a step-up transformer (11e) which are electrically connected in sequence, and form a photovoltaic power supply bus (L g );

[0013] The active distribution network (12) is a 10KV power supply network and forms an active power supply bus (L y ).

[0014] Optionally, the dynamic mold test area (21) comprises: a medium-pressure dynamic mold platform (21a) and an AC / DC hybrid low-voltage test system (21b) electrically connected to the medium-pressure dynamic mold platform (21a);

[0015] The real-type demonstration field area (22) includes: a 10KV real-type demonstration field (22a) and a 10KV real-type demonstration field low-voltage stage area (22b) electrically connected to the 10KV real-type demonstration field (22a).

[0016] Optionally, the experimental platform (20) further comprises: an RLC simulated load (23), the RLC simulated load (23) being used to respectively connect to the AC / DC hybrid low-voltage experimental system (21b) and the 10KV real-type demonstration field low-voltage station area (22b) to perform a load simulation experiment.

[0017] Optionally, the power switching unit (30) further comprises: a box body (34), a U-shaped fixing block (35) and a switching component (36) arranged in an inner cavity of the box body (34), the switching component (36) being slidably arranged in the cavity of the U-shaped fixing block (35), the first input end (31), the second input end (32) and the power supply output end (33) being respectively connected to the side wall of the U-shaped fixing block (35), and extending through the side wall of the box body (34) to the outside thereof, and a limiting tube (37) being arranged at the two input ends and the output end.

[0018] Optionally, a strip-shaped groove (34a) and a through hole (34b) corresponding to the first input end (31), the second input end (32) and the power supply output end (33) are provided on the side wall of the box body (34).

[0019] Optionally, a plurality of groups of plug-in tubes (35a) are arranged on the side wall of the U-shaped fixing block (35), and a placement groove (35b) corresponding to the tube opening of the plug-in tube (35a) is opened on the side wall of the U-shaped inner cavity of the U-shaped fixing block (35); and a conductive ring (35c) is arranged in each plug-in tube (35a) and placement groove (35b);

[0020] A plurality of groups of transverse limiting sliding grooves (35a-1) and longitudinal limiting sliding grooves (35a-2) are provided at equal intervals on the side wall of the plug-in tube (35a), and limiting balls (35a-3) roll in the transverse limiting sliding grooves (35a-1) and the longitudinal limiting sliding grooves (35a-2);

[0021] A plurality of groups of conductive spring sheets (35c-1) are evenly distributed on one end of the conductive ring (35c), gaps are provided between adjacent conductive spring sheets (35c-1), and the thickness of the conductive spring sheets (35c-1) gradually decreases along the axial direction; a conical sliding groove (35c-2) is provided on the outer ring side wall of the conductive spring sheet (35c-1), and the edge of the limiting ball (35a-3) rolls in the conical sliding groove (35c-2);

[0022] Photovoltaic power supply busbar (L g ) and the active power bus (L y ) is plugged into the plug-in tube (35a).

[0023] Optionally, the switching assembly (36) comprises: a rectangular slider (36a) and a toggle member (36b) disposed in an inner cavity of the rectangular slider (36a);

[0024] A mounting cavity (36a-1) is provided in the middle of the rectangular sliding block (36a), and the toggle member (36b) is located in the mounting cavity (36a-1);

[0025] The toggle member (36b) comprises: a first toggle rod (36b-1), a second toggle rod (36b-2), a tension spring (36b-3) and an outer toggle rod (36b-4); one end of the first toggle rod (36b-1) and the second toggle rod (36b-2) are hinged and fixed in position; one end of the first toggle rod (36b-1) and the second toggle rod (36b-2) that are away from each other are respectively connected to one end of the tension spring (36b-3); the outer toggle rod (36b-4) is fixed to the end side wall of the second toggle rod (36b-2) and extends to the outside of the box body (34) through the strip groove (34a).

[0026] Optionally, the deflection spacing of the toggle member (36b) is equal to the sliding distance of the rectangular slider (36a);

[0027] Conductive blocks (36c) are also embedded in the side walls at both ends of the rectangular sliding block (36a); the conductive block (36c) contacts at least one conductive ring (35c); when in contact with two conductive rings (35c), circuit connection is achieved.

[0028] Optionally, the limiting tube (37) is threadedly connected to the outer wall of the plug tube (35a), and the inner wall thereof is provided with a limiting concave ring (37a) and a plurality of groups of extrusion grooves (37b), both of which are in rolling contact with the limiting ball (35a-3); the limiting concave ring (37a) corresponds to and cooperates with the transverse limiting slide groove (35a-1), and the extrusion groove (37b) corresponds to and cooperates with the longitudinal limiting slide groove (35a-2).

[0029] It can be seen from the above technical solutions that this application has the following advantages:

[0030] 1) This application uses a distributed photovoltaic system to supply power, which can detect the impact of environmental factors on rooftop photovoltaic power generation, the power generation status of photovoltaic modules of different materials under different conditions, and simulate and verify the startup, operation and grid-connection process of photovoltaic power stations;

[0031] 2) In this application, the line switching device has a simple and ingenious structure, which can safely and conveniently switch the power supply process between the photovoltaic distribution network and the active distribution network, and effectively utilize the electric energy generated by the photovoltaic distribution network, which is of great significance to energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an experimental system block diagram of a distributed photovoltaic active distribution network experimental system based on line switching provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of photovoltaic distribution network connection of a distributed photovoltaic active distribution network experimental system based on line switching provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the overall structure of a power switching unit of a distributed photovoltaic active distribution network experimental system based on line switching provided in an embodiment of the present application;

[0035] Figure 4 A bottom-up structural schematic diagram of a power switching unit of a distributed photovoltaic active power distribution network experimental system based on line switching provided in an embodiment of the present application;

[0036] Figure 5 for Figure 4 AA surface cross-sectional structural diagram;

[0037] Figure 6 for Figure 5 The enlarged structural diagram of the middle part F;

[0038] Figure 7 A three-dimensional structural diagram of the internal structure of a power switching unit of a distributed photovoltaic active distribution network experimental system based on line switching provided in an embodiment of the present application;

[0039] Figure 8 A schematic cross-sectional view of a distributed photovoltaic active distribution network experimental system based on line switching provided in an embodiment of the present application;

[0040] Fig. 9 This is a schematic diagram of the specific internal structure of the power switching unit of the distributed photovoltaic active distribution network experimental system based on line switching provided in the embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] See also Figure 1-9 A distributed photovoltaic active distribution network experimental system provided in an embodiment of the present application includes a power supply unit 10, an experimental platform 20 and a power switching unit 30. The power supply unit 10 includes a photovoltaic distribution network 11 and an active distribution network 12. The photovoltaic distribution network 11 and the active distribution network 12 are respectively connected to the experimental platform 20 through the power switching unit 30; the experimental platform 20 is located in a laboratory and is used to verify various experimental items in the distribution network. It includes a dynamic model experimental area 21 and a real-type verification field area 22. The dynamic model experimental area 21 is network-connected to the real-type verification field area 22; the power switching unit 30 includes a first input terminal 31, a second input terminal 32 and a power supply output terminal 33. The photovoltaic distribution network 11 and the active distribution network 12 are respectively connected to the first input terminal 31 and the second input terminal 32 through a power supply line L, and the power supply output terminal 33 is connected to the power input terminal of the experimental platform 20.

[0043] Furthermore, this distributed photovoltaic power generation network uses a large number of rooftop photovoltaic modules, which are connected to the experimental system according to the experimental requirements. The photovoltaic distribution network 11 includes a photovoltaic module array 11a, a photovoltaic junction box 11b, a DC distribution cabinet 11c, a photovoltaic grid-connected inverter 11d and a step-up transformer 11e, which are electrically connected in sequence. Through the above-mentioned devices, the electric energy generated by the photovoltaic module array 11a is converted into the required electric energy requirements, and finally the photovoltaic power supply bus L g The specific photovoltaic conversion process can be achieved by using existing technology and will not be described in detail here.

[0044] Similarly, the active distribution network 12 is an existing 10KV power supply network, with active power supply bus L y The experimental system is powered in the form of.

[0045] The dynamic model experimental area 21 includes a medium-voltage dynamic model platform 21a and an AC / DC hybrid low-voltage experimental system 21b electrically connected to the medium-voltage dynamic model platform 21a; the real-type demonstration field area 22 includes a 10KV real-type demonstration field 22a and a 10KV real-type demonstration field low-voltage platform area 22b electrically connected to the 10KV real-type demonstration field 22a; both are existing experimental systems used for simulation verification experiments of photovoltaic distribution networks and active distribution networks, and specifically also include power supply experimental subsystems, physical simulation subsystems, communication control subsystems, measurement control subsystems, integrated control systems, etc., which are not specifically described or further limited here.

[0046] Furthermore, the experimental platform 20 also includes an RLC simulated load 23, which is respectively connected to the AC / DC hybrid low-voltage experimental system 21b and the 10KV real-type demonstration field low-voltage station 22b to perform load simulation experiments. By adding the load, more application scenarios are obtained to enrich the experimental process.

[0047] The power switching unit 30 is a necessary device for realizing line switching of the photovoltaic distribution network 11 and the active distribution network 12. It not only includes a first input terminal 31 and a second input terminal 32 corresponding to the photovoltaic distribution network 11 and the active distribution network 12, but also has a power supply output terminal 33 corresponding to the experimental platform 20; further, the power switching unit 30 also includes a box body 34, a U-shaped fixing block 35 and a switching component 36 arranged in the inner cavity of the box body 34, and the switching component 36 is slidably arranged in the cavity of the U-shaped fixing block 35. The first input terminal 31, the second input terminal 32 and the power supply output terminal 33 are respectively connected to the side walls of the U-shaped fixing block 35, and extend through the side walls of the box body 34 to its outside, and a limiting tube 37 is arranged at the two input ends and the output end.

[0048] Specifically, the side wall of the box body 34 is provided with a strip groove 34a and a through hole 34b corresponding to the first input terminal 31, the second input terminal 32 and the power supply output terminal 33. The through holes 34b match the number and position of the input terminals and the output terminals, and the strip groove 34a serves as the opening of the box body 34 to facilitate the deflection process of the outer lever 36b-4.

[0049] Furthermore, a plurality of groups of plug-in tubes 35a are provided on the side wall of the U-shaped fixing block 35. In the present embodiment, there are two input terminals and one output terminal, that is, three plug-in tubes 35a are provided. A placement groove 35b corresponding to the tube mouth of the plug-in tube 35a is provided on the side wall of the U-shaped inner cavity of the U-shaped fixing block 35. A conductive ring 35c is provided in each plug-in tube 35a and the placement groove 35b. One end of the conductive ring 35c is located in the placement groove 35b and may be greater than the groove cavity depth of the placement groove 35b. The other end thereof extends into the plug-in tube 35a. It should be noted that two input terminals and one output terminal correspond to one conductive ring 35c respectively, and in the present embodiment, the conductive ring 35c corresponding to the power supply output terminal has a plate structure, extending at the bottom of the U-shaped cavity of the U-shaped fixing block 35 and protruding to form a track, and the rectangular slider 36a slides on this track.

[0050] The side wall of the plug-in tube 35a is provided with a plurality of groups of transverse limiting grooves 35a-1 and longitudinal limiting grooves 35a-2 at equal intervals, and limiting balls 35a-3 roll in the transverse limiting grooves 35a-1 and longitudinal limiting grooves 35a-2; one end of the conductive ring 35c located in the plug-in tube 35a is evenly distributed with a plurality of groups of conductive spring sheets 35c-1, there are gaps between adjacent conductive spring sheets 35c-1, and the thickness of the conductive spring sheets 35c-1 along the axial direction gradually decreases, and a conical groove 35c-2 is provided on the outer ring side wall of the conductive spring sheet 35c-1, and the edge of the limiting ball 35a-3 rolls in the conical groove 35c-2; the photovoltaic power supply bus L g and active power supply bus L y Inserted in the plug tube 35a. As shown in the attached drawings, there is a limit ball 35a-3 in the transverse limit slot 35a-1, and the limit ball 35a-3 is always limited in the transverse limit slot 35a-1, and the two ends of the ball are exposed on the inner and outer sides of the plug tube 35a, and can slide laterally along the axial direction of the plug tube 35a. The conical slot 35c-2 has a certain depth difference, and the closer to the ring mouth of the conductive ring 35c, the shallower its depth. When the limit ball 35a-3 moves to the shallow end, it will push the ring mouth of the conductive spring 35c-1 to bend, forming a trend of gathering and encircling.

[0051] Furthermore, the switching assembly 36 includes a rectangular slider 36a and a toggle member 36b arranged in the inner cavity of the rectangular slider 36a; a mounting cavity 36a-1 is arranged in the middle of the rectangular slider 36a, and the toggle member 36b is located in the mounting cavity 36a-1; the toggle member 36b includes a first toggle rod 36b-1, a second toggle rod 36b-2, a tensioning spring 36b-3 and an outer toggle rod 36b-4, one end of the first toggle rod 36b-1 and the second toggle rod 36b-2 are hinged and fixed in position, and the ends of the two that are away from each other are respectively connected to one end of the tensioning spring 36b-3, and the outer toggle rod 36b-4 is fixed on the end side wall of the second toggle rod 36b-2, and extends to the outside of the box body 34 through the strip groove 34a.

[0052] Furthermore, the deflection spacing of the toggle member 36b is equal to the sliding distance of the rectangular slider 36a; conductive blocks 36c are also embedded in the side walls at both ends of the rectangular slider 36a, and the conductive blocks 36c are in contact with at least one conductive ring 35c. When in contact with two conductive rings 35c, the circuit is connected.

[0053] The switching assembly 36 is integrally installed inside the U-shaped portion of the U-shaped fixed block 35. The rectangular slider 36a can slide linearly and reciprocally. Its sliding is driven by the toggle member 36b and will be stably limited by the toggle member 36b at one end of the U-shaped cavity of the U-shaped fixed block 35. Since there is a conductive block 36c at each end of the U-shaped fixed block 35, when the U-shaped fixed block 35 is connected, the conductive ring 35c at one input end is connected to the conductive ring 35c connected to the power supply output end, thereby achieving a stable connection of the power supply line. The tensioning spring 36b-3 can keep the two toggle rods in a deflected state at all times, and the position of the U-shaped fixed block 35 is limited by the two toggle rods. The conductive ring 35c on the other side is separated from the conductive block 36c, realizing the disconnection of the other power supply line, and the state is stable.

[0054] Furthermore, the limiting tube 37 is threadedly connected to the outer wall of the plug-in tube 35a (the thread is not shown in the attached figure), and a limiting concave ring 37a and a plurality of groups of extrusion grooves 37b are provided on the inner wall, both of which are in rolling contact with the limiting ball 35a-3; the limiting concave ring 37a corresponds to and cooperates with the transverse limiting groove 35a-1, and the extrusion groove 37b corresponds to and cooperates with the longitudinal limiting groove 35a-2.

[0055] The cooperation of the limiting tube 37, the plug-in tube 35a and the conductive spring sheet 35c-1 realizes the clamping of the power supply busbar inserted into the plug-in tube 35a, and realizes the purpose of stable line connection. Specifically, the side wall of the conductive spring sheet 35c-1 is provided with a tapered slot 35c-2 corresponding to the position of the transverse limiting slot 35a-1, and the limiting tube 37 is threadedly connected to the outer wall of the plug-in tube 35a. When the limiting ball 35a-3 is pushed by the limiting tube 37 to move in the tapered slot 35c-2, the edge of the conductive spring sheet 35c-1 is pushed to move toward the middle, thereby clamping the power supply busbar cell; further, the limiting tube 37 will squeeze the limiting ball 35a-3 through the squeezing groove 37b to move longitudinally in the longitudinal limiting slot 35a-2, thereby squeezing and clamping the insulation layer of the power supply busbar, thereby maintaining the stability of the busbar connection.

[0056] Refer to the attached Figure 1-9 As shown in FIG. , the working principle of the power switching unit 30 is:

[0057] In the initial state, the limiting tube 37 is rotated to be located at the innermost end of the plug-in tube 35a. At this time, the limiting ball 35a-3 in the transverse limiting groove 35a-1 is also at the end of the conical groove 35c-2, and will not squeeze the conductive spring piece 35c-1, and the conductive ring 35c is at its maximum opening; the limiting ball 35a-3 in the longitudinal limiting groove 35a-2 is not squeezed by the extrusion groove 37b and is in a free moving state.

[0058] The photovoltaic power supply bus L g and active power supply bus L y The output ends of the cables are respectively inserted into a plug-in tube 35a. When the plug-in is to the maximum depth, the limit tube 37 is rotated to move toward the other end of the plug-in tube 35a. During the process, the limit tube 37 pushes the limit ball 35a-3 to move in the lateral limit groove 35a-1 and the conical groove 35c-2 through the limit concave ring 37a. Due to the change in the depth of the conical groove 35c-2, the conductive spring 35c-1 is pushed to deform, so that each spring gathers toward the central axis to form a siege for the wire core; at the same time, the limit tube 37 squeezes the limit ball 35a-3 through the extrusion groove 37b to move longitudinally in the longitudinal limit groove 35a-2, thereby achieving the extrusion and clamping of the insulation layer of the power supply busbar, thereby stably connecting the power switching device to the cable.

[0059] When switching the power supply line, it is only necessary to manually push the outer lever 36b-4 to drive the first lever 36b-1 and the second lever 36b-2 to deflect around the hinge point. During the deflection process, the two levers will push the rectangular slider 36a to slide in the U-shaped fixed block 35, sliding from one end to the other end. The tensioning spring 36b-3 maintains the position to prevent the rectangular slider 36a from sliding. The rectangular slider 36a will drive the conductive block 36c at the end to contact the conductive ring 35c on the corresponding side. When in contact, the power supply line on the corresponding side can be turned on. The line switching process is simple and convenient, and the line connection can be kept stable.

[0060] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0062] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0063] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0065] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A distributed photovoltaic active distribution network experimental system, characterized in that: include: A power supply unit (10), an experimental platform (20) and a power switching unit (30); The power supply unit (10) comprises: a photovoltaic power distribution network (11) and an active power distribution network (12), and the photovoltaic power distribution network (11) and the active power distribution network (12) are respectively connected to the experimental platform (20) via a power switching unit (30); The experimental platform (20) includes: a dynamic model experimental area (21) and a real model demonstration area (22), and the dynamic model experimental area (21) and the real model demonstration area (22) are connected by a network; The power switching unit (30) comprises: a first input end (31), a second input end (32) and a power supply output end (33); the photovoltaic power distribution network (11) and the active power distribution network (12) are respectively connected to the first input end (31) and the second input end (32) via power supply lines (L); and the power supply output end (33) is connected to the power supply input end of the experimental platform (20).

2. The distributed photovoltaic active distribution network experimental system according to claim 1 is characterized in that: The photovoltaic distribution network (11) comprises: a photovoltaic module array (11a), a photovoltaic junction box (11b), a DC power distribution cabinet (11c), a photovoltaic grid-connected inverter (11d) and a step-up transformer (11e) which are electrically connected in sequence, and form a photovoltaic power supply bus (L g ); The active distribution network (12) is a 10KV power supply network and forms an active power supply bus (L y ).

3. The distributed photovoltaic active distribution network experimental system according to claim 2 is characterized in that: The dynamic mold test area (21) comprises: a medium-pressure dynamic mold platform (21a) and an AC / DC hybrid low-voltage test system (21b) electrically connected to the medium-pressure dynamic mold platform (21a); The real-type demonstration field area (22) includes: a 10KV real-type demonstration field (22a) and a 10KV real-type demonstration field low-voltage stage area (22b) electrically connected to the 10KV real-type demonstration field (22a).

4. The distributed photovoltaic active distribution network experimental system according to claim 3 is characterized in that: The experimental platform (20) further comprises: an RLC simulated load (23), the RLC simulated load (23) being used to respectively connect to the AC / DC hybrid low-voltage experimental system (21b) and the 10KV real-type demonstration field low-voltage station area (22b) to perform a load simulation experiment.

5. The distributed photovoltaic active distribution network experimental system according to any one of claims 2 to 4, characterized in that: The power switching unit (30) further comprises: a box body (34), a U-shaped fixing block (35) and a switching assembly (36) arranged in the inner cavity of the box body (34), the switching assembly (36) being slidably arranged in the cavity of the U-shaped fixing block (35), the first input end (31), the second input end (32) and the power supply output end (33) being respectively connected to the side wall of the U-shaped fixing block (35) and extending through the side wall of the box body (34) to the outside thereof, and a limiting tube (37) being arranged at the two input ends and the output end.

6. The distributed photovoltaic active distribution network experimental system according to claim 5, characterized in that: The side wall of the box body (34) is provided with a strip-shaped groove (34a) and a through hole (34b) corresponding to the first input end (31), the second input end (32) and the power supply output end (33).

7. The distributed photovoltaic active distribution network experimental system according to claim 6, characterized in that: A plurality of groups of plug-in tubes (35a) are arranged on the side wall of the U-shaped fixing block (35), and a placement groove (35b) corresponding to the tube opening of the plug-in tube (35a) is opened on the side wall of the U-shaped inner cavity of the U-shaped fixing block (35); a conductive ring (35c) is arranged in each plug-in tube (35a) and placement groove (35b); A plurality of groups of transverse limiting sliding grooves (35a-1) and longitudinal limiting sliding grooves (35a-2) are provided at equal intervals on the side wall of the plug-in tube (35a), and limiting balls (35a-3) roll in the transverse limiting sliding grooves (35a-1) and the longitudinal limiting sliding grooves (35a-2); A plurality of groups of conductive spring sheets (35c-1) are evenly distributed on one end of the conductive ring (35c), gaps are provided between adjacent conductive spring sheets (35c-1), and the thickness of the conductive spring sheets (35c-1) gradually decreases along the axial direction; a conical sliding groove (35c-2) is provided on the outer ring side wall of the conductive spring sheet (35c-1), and the edge of the limiting ball (35a-3) rolls in the conical sliding groove (35c-2); Photovoltaic power supply busbar (L g ) and the active power bus (L y ) is plugged into the plug-in tube (35a).

8. The distributed photovoltaic active distribution network experimental system according to claim 7 is characterized in that: The switching assembly (36) comprises: a rectangular slider (36a) and a toggle member (36b) arranged in the inner cavity of the rectangular slider (36a); A mounting cavity (36a-1) is provided in the middle of the rectangular sliding block (36a), and the toggle member (36b) is located in the mounting cavity (36a-1); The toggle member (36b) comprises: a first toggle rod (36b-1), a second toggle rod (36b-2), a tension spring (36b-3) and an outer toggle rod (36b-4); one end of the first toggle rod (36b-1) and the second toggle rod (36b-2) are hinged and fixed in position; one end of the first toggle rod (36b-1) and the second toggle rod (36b-2) that are away from each other are respectively connected to one end of the tension spring (36b-3); the outer toggle rod (36b-4) is fixed to the end side wall of the second toggle rod (36b-2) and extends to the outside of the box body (34) through the strip groove (34a).

9. The distributed photovoltaic active distribution network experimental system according to claim 8, characterized in that: The deflection spacing of the toggle member (36b) is equal to the sliding distance of the rectangular slider (36a); Conductive blocks (36c) are also embedded in the side walls at both ends of the rectangular sliding block (36a); the conductive block (36c) contacts at least one conductive ring (35c); when in contact with two conductive rings (35c), circuit connection is achieved.

10. The distributed photovoltaic active distribution network experimental system according to claim 9, characterized in that: The limiting tube (37) is threadedly connected to the outer wall of the plug tube (35a), and the inner wall thereof is provided with a limiting concave ring (37a) and a plurality of groups of extrusion grooves (37b), both of which are in rolling contact with the limiting balls (35a-3); the limiting concave ring (37a) corresponds to and cooperates with the transverse limiting slide groove (35a-1), and the extrusion groove (37b) corresponds to and cooperates with the longitudinal limiting slide groove (35a-2).

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