High-voltage direct-current micro-grid system and power supply and distribution architecture

Abstract

The utility model provides a high-voltage direct-current micro-grid system and a power supply and distribution framework. The high-voltage direct-current micro-grid system comprises a multi-pulse transformer rectifier, a power distribution cabinet and a voltage regulating module, the input end of the multi-pulse transformer rectifier is connected to a high-voltage switch cabinet, and the output end of the multi-pulse transformer rectifier is connected to the input end of the power distribution cabinet, so that three-phase alternating-current high-voltage electricity is converted into high-voltage direct current; the output end of the power distribution cabinet is connected to the voltage regulating module; and the voltage regulating module is connected with an external load. According to the application, 1500V direct current power supply in a long-distance power distribution scene can be realized, and the construction cost is reduced on the basis of increasing the power supply distance.

Description

Technical Field

[0001] The present application relates to the field of microgrid technology, and in particular to a high-voltage direct current microgrid system and a power supply and distribution architecture. Background Art

[0002] As the application of microgrids becomes more mature, higher requirements are placed on the effects and benefits of microgrids. However, due to the low output voltage and high cable cost of traditional AC microgrids, the power supply distance of AC microgrids is short and the loss is high when the voltage drop ratio specified by the national standard is met.

[0003] In order to increase the power supply distance and application scenarios of microgrids while saving costs and improving efficiency, the DC microgrid system has been proposed and is gradually being applied. DC microgrids have obvious advantages over AC microgrids. However, in order for DC microgrids to have an absolute advantage over AC microgrids in terms of cost and efficiency, their system voltage must be high. Limited by the current device withstand voltage level, the voltage cannot be increased indefinitely.

[0004] At present, the DC bus used in actual power supply and distribution scenarios is 800V. Although the 800V DC bus has obvious advantages over the 220V single-phase AC bus and the 380V AC bus, it still cannot meet the power supply and distribution scenarios with long distances such as highways and mountainous areas. However, due to the voltage resistance level of current semiconductor devices, the voltage cannot be increased arbitrarily. Utility Model Content

[0005] The purpose of this application is to provide a high-voltage wastebasket microgrid system and a power supply and distribution architecture to solve the technical problem that the DC power supply voltage that can be provided in long-distance power distribution scenarios in the prior art cannot meet actual needs.

[0006] To achieve the above-mentioned purpose and other related purposes, in the first aspect, the present application provides a high-voltage direct current microgrid system, which includes: a multi-pulse transformer-rectifier, a distribution cabinet and a voltage regulating module; the input end of the multi-pulse transformer-rectifier is connected to a high-voltage switch cabinet, and the output end is connected to the input end of the distribution cabinet to convert three-phase alternating current high voltage electricity into high-voltage direct current electricity; the output end of the distribution cabinet is connected to the voltage regulating module; and the voltage regulating module is connected to an external load.

[0007] In an implementation of the first aspect, the external load is a conventional load, and the voltage regulation module includes a step-down unit; the output end of the power distribution cabinet is connected to the step-down unit, and the step-down unit converts the high-voltage direct current into low-voltage direct current for the conventional load; and the conventional load is connected to the step-down unit.

[0008] In an implementation of the first aspect, the step-down unit includes: a first capacitor, a second capacitor, a third capacitor, a first MOS transistor, a second MOS transistor, a first diode, a second diode, a first inductor, and a second inductor; one end of the first capacitor is connected to the positive electrode of the high-voltage direct current, the other end is connected to one end of the second capacitor, the other end of the second capacitor is connected to the negative electrode of the high-voltage direct current, the drain of the first MOS transistor is connected to the positive electrode of the high-voltage direct current, the source of the first MOS transistor is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to the negative electrode of the second diode, and are commonly connected to a connection line between the first capacitor and the second capacitor, the positive electrode of the second diode is connected to the drain of the second MOS transistor, the source of the second MOS transistor is connected to the negative electrode of the high-voltage direct current, one end of the first inductor is connected to the connection line between the first MOS transistor and the first diode, the other end of the first inductor is connected to one end of the third capacitor, one end of the second inductor is connected to the connection line between the second diode and the second MOS transistor, the other end of the second inductor is connected to the other end of the third capacitor, and both ends of the third capacitor are output and connected to the conventional load.

[0009] In an implementation of the first aspect, the external load is a distributed photovoltaic device, and the voltage regulation module includes a boost unit; the distributed photovoltaic device includes a plurality of photovoltaic panels, and the plurality of photovoltaic panels are connected in series to form a voltage lower than the high-voltage direct current; the output end of the power distribution cabinet is connected to the input end of the boost unit, and the output end of the boost unit is connected to the distributed photovoltaic device.

[0010] In an implementation of the first aspect, the boost unit includes: a fourth capacitor, a fifth capacitor, a sixth capacitor, a third MOS transistor, a fourth MOS transistor, a third diode, a fourth diode, a third inductor and a fourth inductor; one end of the fourth capacitor is connected to the positive electrode of the high-voltage direct current, and the other end is connected to one end of the fifth capacitor, the other end of the fifth capacitor is connected to the negative electrode of the high-voltage direct current, one end of the third inductor is connected to the positive electrode of the high-voltage direct current, the other end of the third inductor is connected to the positive electrode of the third diode, the drain of the third MOS transistor is connected to the connection line between the third inductor and the third diode, the source of the third MOS transistor is connected to the drain of the fourth MOS transistor, and they are jointly connected to the connection line between the fourth capacitor and the fifth capacitor, one end of the fourth inductor is connected to the negative electrode of the high-voltage direct current, the other end is connected to the source of the fourth MOS transistor, and is jointly connected to the negative electrode of the fourth diode, the negative electrode of the third diode is connected to one end of the sixth capacitor, the positive electrode of the fourth diode is connected to the other end of the sixth capacitor, and both ends of the sixth capacitor are output and connected to the distributed photovoltaic device.

[0011] In an implementation of the first aspect, the external load is an energy storage device, and the voltage regulation module includes a DC-DC charge and discharge unit; the input end of the DC-DC charge and discharge unit is connected to the high voltage direct current, and the output end of the DC-DC charge and discharge unit is connected to the energy storage device.

[0012] In an implementation of the first aspect, the DC-DC charging and discharging unit includes: a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth MOS tube, a sixth MOS tube, a seventh MOS tube, an eighth MOS tube, a fifth inductor and a sixth inductor; one end of the seventh capacitor is connected to the positive electrode of the high-voltage direct current, the other end of the seventh capacitor is connected to one end of the eighth capacitor, the other end of the eighth capacitor is connected to the negative electrode of the high-voltage direct current, the drain of the fifth MOS tube is connected to the positive electrode of the high-voltage direct current, the source of the fifth MOS tube is connected to the drain of the sixth MOS tube, the source of the sixth MOS tube is connected to the drain of the seventh MOS tube, and the seventh capacitor and the eighth capacitor are connected together. On the connecting line, the source of the seventh MOS tube is connected to the drain of the eighth MOS tube, the source of the eighth MOS tube is connected to the negative electrode of the high voltage direct current, one end of the fifth inductor is connected to the connecting line between the fifth MOS tube and the sixth MOS tube, the other end of the fifth inductor is connected to one end of the ninth capacitor, one end of the sixth inductor is connected to the connecting line between the seventh MOS tube and the eighth MOS tube, the other end of the sixth inductor is connected to one end of the tenth capacitor, the other end of the ninth capacitor is connected to the other end of the tenth capacitor, and are jointly connected to the connecting line between the sixth MOS tube and the seventh MOS tube, and one end of the ninth capacitor and one end of the tenth capacitor are output and connected to the energy storage device.

[0013] In an implementation of the first aspect, the high voltage direct current output by the multi-pulse transformer-rectifier is 1500V.

[0014] In an implementation of the first aspect, the high-voltage switchgear to which the multi-pulse transformer-rectifier is connected is a 10KV switchgear.

[0015] In a second aspect, the present application provides a power supply and distribution architecture, which includes the high-voltage direct current microgrid system described in any implementation method of the first aspect of the present application.

[0016] As described above, the high-voltage direct current microgrid system and power supply and distribution architecture described in this application have the following beneficial effects:

[0017] This application connects a multi-pulse transformer rectifier to a 10KV switch cabinet, converts the input voltage into a 1500V DC voltage, and uses it as the power supply voltage to transmit it to the distribution cabinet, and the distribution cabinet supplies power to the external load, thereby realizing the practical application of a 1500V high-voltage DC microgrid. The DC cable of the high-voltage DC microgrid system of this application has a maximum of only 3 cores, which greatly reduces the system cost. That is, this application can realize 1500V DC power supply in long-distance distribution scenarios, reducing construction costs while increasing the power supply distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a structural schematic diagram of a high-voltage direct current microgrid system according to an embodiment of the present application.

[0019] Figure 2 Shown is a circuit diagram of a high-voltage direct current microgrid system connected to an external conventional load according to an embodiment of the present application.

[0020] Figure 3 Shown is a circuit diagram of a high-voltage direct current microgrid system connected to an external distributed photovoltaic device as described in an embodiment of the present application.

[0021] Figure 4 Shown is a circuit diagram of an external energy storage device for a high-voltage direct current microgrid system according to an embodiment of the present application.

[0022] Figure 5 Shown is a circuit diagram of a high-voltage direct current microgrid system according to an embodiment of the present application.

[0023] Figure 6 Shown is a schematic structural diagram of a charging station according to an embodiment of the present application.

[0024] Description of symbols

[0025] 100 High Voltage DC Microgrid System

[0026] 110 Multi-pulse transformer rectifier

[0027] 120 Distribution Cabinet

[0028] 130 Voltage Regulator Module

[0029] 131 Step-down unit

[0030] 132 booster unit

[0031] 133 DC-DC charging and discharging unit

[0032] 200 Power supply and distribution architecture

[0033] 210 High voltage switchgear

[0034] 220 Load

[0035] 600 Charging Stations

[0036] 610 DC box transformer

[0037] 620 Charging Station DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0039] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0040] In the description of the present application, it should be understood that the terms "middle", "upper", "lower", "top", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, it should be understood that, unless otherwise specified or indicated, the terms "first", "second", etc. appearing in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc., nor can they be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0042] In view of the problem that the current high-voltage DC microgrid system cannot meet the supply voltage of more than 800V, resulting in the DC supply voltage that can be provided for long-distance power distribution scenarios failing to meet actual needs, the present application provides a high-voltage DC microgrid system and power supply and distribution architecture, which converts 10KV high-voltage AC into 1500V DC bus voltage by adding a multi-pulse transformer rectifier between the high-voltage switch cabinet and the power distribution equipment, so as to distribute the voltage to the external load through the power distribution cabinet. The DC cable of the high-voltage DC microgrid system of the present application has only 3 cores at most, which greatly reduces the system cost, that is, the present application can realize 1500V DC power supply in long-distance power distribution scenarios, and reduce the construction cost on the basis of increasing the power supply distance.

[0043] The following will be combined with the attached Figure 1 To Attachment Figure 6 The principles and implementation methods of a high-voltage switch assembly and a distribution switch of this embodiment are described in detail so that those skilled in the art can understand the high-voltage switch assembly and the distribution switch of this embodiment without creative work.

[0044] See also Figure 1 , showing a schematic diagram of the structure of a high-voltage direct current microgrid system in one embodiment of the present application. Figure 1 As shown, the high-voltage direct current microgrid system 100 includes: a multi-pulse transformer rectifier 110 , a power distribution cabinet 120 and a voltage regulation module 130 .

[0045] Among them, the input end of the multi-pulse transformer rectifier 110 is connected to a high-voltage switch cabinet, and the output end is connected to the input end of the distribution cabinet 120 to convert the three-phase AC high-voltage electricity into high-voltage DC electricity; the output end of the distribution cabinet 120 is connected to the voltage regulating module 130; the voltage regulating module 130 is connected to an external load.

[0046] Specifically, the high-voltage direct current output by the multi-pulse transformer-rectifier is 1500V; the high-voltage switchgear connected to the multi-pulse transformer-rectifier is a 10KV switchgear.

[0047] External loads include: conventional loads, distributed photovoltaic equipment and energy storage equipment. To meet the power supply requirements of different external devices, different external devices need to be connected to different voltage regulation modules.

[0048] The following introduces the design of the voltage regulating module corresponding to the external load being a conventional load.

[0049] The power supply voltage required by conventional loads is often lower than the bus voltage output by the distribution cabinet. In order to meet the low voltage requirements of conventional loads, the voltage regulating module between the conventional loads and the distribution cabinet needs to be set to a voltage reduction function.

[0050] In some implementations, the voltage regulation module 130 includes a voltage reduction unit 131 .

[0051] like Figure 2 As shown, the step-down unit 131 includes: a first capacitor C1, a second capacitor C2, a third capacitor C3, a first MOS transistor Q1, a second MOS transistor Q2, a first diode D1, a second diode D2, a first inductor L1 and a second inductor L2.

[0052] Specifically, one end of the first capacitor C1 is connected to the positive electrode of the high-voltage direct current, and the other end is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is connected to the negative electrode of the high-voltage direct current, the drain of the first MOS tube Q1 is connected to the positive electrode of the high-voltage direct current, the source of the first MOS tube Q1 is connected to the negative electrode of the first diode D1, the positive electrode of the first diode D1 is connected to the negative electrode of the second diode D2, and are commonly connected to the connecting line between the first capacitor C1 and the second capacitor C2, the positive electrode of the second diode D2 is connected to the drain of the second MOS tube Q2, the source of the second MOS tube Q2 is connected to the negative electrode of the high-voltage direct current, one end of the first inductor L1 is connected to the connecting line between the first MOS tube Q1 and the first diode D1, the other end of the first inductor L1 is connected to one end of the third capacitor C3, one end of the second inductor L2 is connected to the connecting line between the second diode D2 and the second MOS tube Q2, the other end of the second inductor L2 is connected to the other end of the third capacitor C3, and the two-end output of the third capacitor C3 is connected to the conventional load.

[0053] The input end of the step-down unit is connected to the output end of the distribution cabinet, and the output end of the step-down unit is connected to the conventional load to convert the 1500V high-voltage DC power into the low-voltage DC power required by the conventional load, so that the conventional load can be directly connected to the DC bus to meet the power supply requirements.

[0054] The following introduces the design of the voltage regulating module corresponding to the external load of distributed photovoltaic equipment.

[0055] Distributed photovoltaic equipment includes several photovoltaic panels. Due to the manufacturing process, the maximum system voltage of each photovoltaic panel is exactly 1500V. Therefore, the photovoltaic panels are connected in series to form a voltage lower than 1500V. The output voltage needs to be increased to the same as the 1500V high-voltage direct current through a boost circuit, so that the distributed photovoltaic equipment can be directly connected to the DC bus to meet the power supply needs.

[0056] In some implementations, the voltage regulation module 130 includes a boost unit 132 .

[0057] like Figure 3 As shown, the boost unit 132 includes: a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a third MOS transistor Q3, a fourth MOS transistor Q4, a third diode D3, a fourth diode D4, a third inductor L3 and a fourth inductor L4.

[0058] Specifically, one end of the fourth capacitor C4 is connected to the positive electrode of the high-voltage direct current, and the other end is connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to the negative electrode of the high-voltage direct current. One end of the third inductor L3 is connected to the positive electrode of the high-voltage direct current, and the other end of the third inductor L3 is connected to the positive electrode of the third diode D3. The drain of the third MOS tube Q3 is connected to the connecting line between the third inductor L3 and the third diode D3, the source of the third MOS tube Q3 is connected to the drain of the fourth MOS tube Q4, and they are jointly connected to the connecting line between the fourth capacitor C4 and the fifth capacitor C5. One end of the fourth inductor L4 is connected to the negative electrode of the high-voltage direct current, and the other end is connected to the source of the fourth MOS tube Q4, and is jointly connected to the negative electrode of the fourth diode D4. The negative electrode of the third diode D3 is connected to one end of the sixth capacitor C6, and the positive electrode of the fourth diode D4 is connected to the other end of the sixth capacitor C6. The two-end output of the sixth capacitor C6 is connected to the distributed photovoltaic device.

[0059] The input end of the boost unit is connected to the output end of the power distribution cabinet, and the output end of the boost unit is connected to the distributed photovoltaic equipment, so that the distributed photovoltaic equipment can be directly connected to the DC bus to meet the power supply demand.

[0060] The following introduces the design of the voltage regulating module corresponding to the external load being the energy storage device.

[0061] In some implementations, the voltage regulation module 130 includes a DC-DC charging and discharging unit 133 .

[0062] like Figure 4 As shown, the DC-DC charge and discharge unit 133 includes: a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh MOS transistor Q7, an eighth MOS transistor Q8, a fifth inductor L5 and a sixth inductor L6.

[0063] Specifically, one end of the seventh capacitor C7 is connected to the positive electrode of the high-voltage direct current, the other end of the seventh capacitor C7 is connected to one end of the eighth capacitor C8, the other end of the eighth capacitor C8 is connected to the negative electrode of the high-voltage direct current, the drain of the fifth MOS tube Q5 is connected to the positive electrode of the high-voltage direct current, the source of the fifth MOS tube Q5 is connected to the drain of the sixth MOS tube Q6, the source of the sixth MOS tube Q6 is connected to the drain of the seventh MOS tube Q7, and are commonly connected to the connection line of the seventh capacitor C7 and the eighth capacitor C8, the source of the seventh MOS tube Q7 is connected to the drain of the eighth MOS tube Q8, and the source of the eighth MOS tube Q8 is connected to The negative electrode of the high-voltage direct current, one end of the fifth inductor L5 is connected to the connection line between the fifth MOS tube Q5 and the sixth MOS tube Q6, the other end of the fifth inductor L5 is connected to one end of the ninth capacitor C9, one end of the sixth inductor L6 is connected to the connection line between the seventh MOS tube Q7 and the eighth MOS tube Q8, the other end of the sixth inductor L6 is connected to one end of the tenth capacitor C10, the other end of the ninth capacitor C9 is connected to the other end of the tenth capacitor C10, and are commonly connected to the connection line between the sixth MOS tube Q6 and the seventh MOS tube Q7, and one end of the ninth capacitor C9 and one end of the tenth capacitor C10 are output and connected to the energy storage device.

[0064] like Figure 5 As shown, it is a circuit diagram of the high-voltage DC microgrid system of the present application. The high-voltage DC microgrid system 100 of the present application outputs a 1500V DC voltage by connecting to a multi-pulse transformer rectifier 110, so that the distribution cabinet 120 can supply power to the load 220. At the same time, the corresponding voltage regulation module 130 is connected according to different types of loads 220 to meet the power supply requirements of the loads 220.

[0065] It should be noted that Figure 5 The circuit shown is partly Figures 2 to 4 The connection method is the same, so I will not go into details here.

[0066] The present application also provides a power supply and distribution architecture.

[0067] In some implementations, such as Figure 1 As shown, the power supply and distribution architecture 200 includes the high-voltage direct current microgrid system 100, a high-voltage switch cabinet 210 and a load 220 as described in any embodiment of the present application.

[0068] The output end of the high-voltage switch cabinet 210 is connected to the high-voltage DC microgrid system 100 ; the output end of the high-voltage DC microgrid system 100 is connected to the load 220 to provide a DC power supply to the load 220 .

[0069] like Figure 6As shown, an embodiment of the present application provides a charging station. The charging station 600 includes: a high-voltage switch cabinet 210, a DC box transformer 610, a power distribution cabinet 120, a step-down unit 131 and a charging pile 620.

[0070] It should be noted that, compared with the traditional box transformer, the DC box transformer in this embodiment includes the multi-pulse transformer rectifier described in the above embodiment of the present application; since the charging piles in the charging station are conventional loads, in actual scenarios, a step-down unit is designed to meet the actual step-down requirements.

[0071] In this embodiment, a 1250KVA DC transformer (compared with the traditional AC transformer, it has an additional rectifier part, and the internal transformer is also a multi-pulse transformer rectifier) ​​replaces the 1250KVA AC transformer, converts the input three-phase 10KV voltage into a 1500V DC voltage, and outputs it to the distribution cabinet, and then pulls the cable through the DC distribution cabinet to 10 120KW charging piles; each charging pile uses a voltage regulator module with a 1500V DC voltage as input to ensure that the charging pile is powered normally. Finally, due to the use of a 1500V high voltage for power supply, the cable voltage level on the low-voltage side becomes 1.8 / 3KV.

[0072] This embodiment uses a 1500V DC power supply solution, which saves about 18.6% of the total cost compared to the original AC solution. The cost of the cable from the 1250KVA DC box transformer to the distribution cabinet and from the distribution cabinet to the charging pile is about 1 / 5 of the AC 380V power supply.

[0073] Although each charging pile needs to be equipped with a voltage regulator module under the DC 1500V power supply solution, and the cable voltage level becomes higher, it solves the problem that the charging piles in the outdoor parking lot charging station are far away from the distribution cabinet and the box transformer. At the same time, the cost of the additional voltage regulator module and the internal rectifier device of the box transformer when using DC power supply is much less than the cost of using cables with more wires and larger cross-sectional areas, which is equivalent to improving the economic benefits of the project.

[0074] The descriptions of the processes or structures corresponding to the above-mentioned figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0075] In summary, this application converts the input voltage into 1500V DC voltage by connecting a multi-pulse transformer rectifier to a 10KV switch cabinet, and uses this as the power supply voltage to transmit it to the distribution cabinet, and the distribution cabinet supplies power to the external load, thereby realizing the practical application of 1500V high-voltage DC microgrid. The DC cable of the high-voltage DC microgrid system of this application has only 3 cores at most, which greatly reduces the system cost, that is, this application can realize 1500V DC power supply in long-distance power distribution scenarios, and reduce construction costs on the basis of increasing the power supply distance. Therefore, this application effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0076] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A high voltage direct current microgrid system, characterized in that: include: Multi-pulse transformer rectifier, power distribution cabinet and voltage regulation module; The input end of the multi-pulse transformer rectifier is connected to a high-voltage switch cabinet, and the output end is connected to the input end of the power distribution cabinet to convert the three-phase AC high-voltage electricity into high-voltage DC electricity; The output end of the power distribution cabinet is connected to the voltage regulating module; The voltage regulating module is connected to an external load.

2. The high voltage direct current microgrid system according to claim 1, characterized in that: The external load is a conventional load, and the voltage regulating module includes a voltage step-down unit; The output end of the power distribution cabinet is connected to the step-down unit, and the step-down unit converts the high-voltage direct current into the low-voltage direct current of the conventional load; The conventional load is connected to the step-down unit.

3. The high voltage direct current microgrid system according to claim 2, characterized in that: The step-down unit includes: a first capacitor, a second capacitor, a third capacitor, a first MOS transistor, a second MOS transistor, a first diode, a second diode, a first inductor and a second inductor; One end of the first capacitor is connected to the positive electrode of the high-voltage direct current, and the other end is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the negative electrode of the high-voltage direct current. The drain of the first MOS tube is connected to the positive electrode of the high-voltage direct current, the source of the first MOS tube is connected to the negative electrode of the first diode, the positive electrode of the first diode is connected to the negative electrode of the second diode, and are commonly connected to the connecting line between the first capacitor and the second capacitor, the positive electrode of the second diode is connected to the drain of the second MOS tube, and the source of the second MOS tube is connected to the negative electrode of the high-voltage direct current. One end of the first inductor is connected to the connecting line between the first MOS tube and the first diode, and the other end of the first inductor is connected to one end of the third capacitor. One end of the second inductor is connected to the connecting line between the second diode and the second MOS tube, and the other end of the second inductor is connected to the other end of the third capacitor. Both ends of the third capacitor are output and connected to the conventional load.

4. The high-voltage direct current microgrid system according to claim 1, characterized in that: The external load is a distributed photovoltaic device, and the voltage regulation module includes a boost unit; The distributed photovoltaic equipment includes a plurality of photovoltaic panels, and the plurality of photovoltaic panels are connected in series to form a voltage lower than the high voltage direct current; The output end of the power distribution cabinet is connected to the input end of the boost unit, and the output end of the boost unit is connected to the distributed photovoltaic device.

5. The high voltage direct current microgrid system according to claim 4, characterized in that: The boost unit includes: a fourth capacitor, a fifth capacitor, a sixth capacitor, a third MOS transistor, a fourth MOS transistor, a third diode, a fourth diode, a third inductor and a fourth inductor; One end of the fourth capacitor is connected to the positive electrode of the high-voltage direct current, and the other end is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is connected to the negative electrode of the high-voltage direct current. One end of the third inductor is connected to the positive electrode of the high-voltage direct current, and the other end of the third inductor is connected to the positive electrode of the third diode. The drain of the third MOS tube is connected to the connecting line between the third inductor and the third diode, the source of the third MOS tube is connected to the drain of the fourth MOS tube, and they are jointly connected to the connecting line between the fourth capacitor and the fifth capacitor. One end of the fourth inductor is connected to the negative electrode of the high-voltage direct current, and the other end is connected to the source of the fourth MOS tube, and is jointly connected to the negative electrode of the fourth diode. The negative electrode of the third diode is connected to one end of the sixth capacitor, and the positive electrode of the fourth diode is connected to the other end of the sixth capacitor. The two-end output of the sixth capacitor is connected to the distributed photovoltaic device.

6. The high voltage direct current microgrid system according to claim 1, characterized in that: The external load is an energy storage device, and the voltage regulation module includes a DC-DC charging and discharging unit; The input end of the DC-DC charging and discharging unit is connected to the high voltage direct current, and the output end of the DC-DC charging and discharging unit is connected to the energy storage device.

7. The high voltage direct current microgrid system according to claim 6, characterized in that: The DC-DC charging and discharging unit includes: a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, a fifth inductor and a sixth inductor; One end of the seventh capacitor is connected to the positive electrode of the high-voltage direct current, the other end of the seventh capacitor is connected to one end of the eighth capacitor, the other end of the eighth capacitor is connected to the negative electrode of the high-voltage direct current, the drain of the fifth MOS tube is connected to the positive electrode of the high-voltage direct current, the source of the fifth MOS tube is connected to the drain of the sixth MOS tube, the source of the sixth MOS tube is connected to the drain of the seventh MOS tube, and are commonly connected to the connection line between the seventh capacitor and the eighth capacitor, the source of the seventh MOS tube is connected to the drain of the eighth MOS tube, and the source of the eighth MOS tube is connected to the negative electrode of the high-voltage direct current, one end of the fifth inductor is connected to the connection line between the fifth MOS tube and the sixth MOS tube, the other end of the fifth inductor is connected to one end of the ninth capacitor, one end of the sixth inductor is connected to the connection line between the seventh MOS tube and the eighth MOS tube, the other end of the sixth inductor is connected to one end of the tenth capacitor, the other end of the ninth capacitor is connected to the other end of the tenth capacitor, and are commonly connected to the connection line between the sixth MOS tube and the seventh MOS tube, and one end of the ninth capacitor and one end of the tenth capacitor are output and connected to the energy storage device.

8. The high voltage direct current microgrid system according to claim 1, characterized in that: The high voltage direct current output by the multi-pulse transformer rectifier is 1500V.

9. The high voltage direct current microgrid system according to claim 1, characterized in that: The high-voltage switch cabinet to which the multi-pulse transformer-rectifier is connected is a 10KV switch cabinet.

10. A power supply and distribution architecture, characterized in that: A high-voltage direct current microgrid system, a high-voltage switch cabinet and a load as claimed in any one of claims 1 to 9; The output end of the high-voltage switch cabinet is connected to the high-voltage DC microgrid system; The output end of the high-voltage direct current microgrid system is connected to the load to provide a direct current power supply to the load.

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