Alternating current and direct current hybrid micro-grid system and implementation method

Abstract

The invention belongs to the technical field of micro-grids, and particularly relates to an alternating current and direct current hybrid micro-grid system and an implementation method, and the system comprises an alternating current and direct current hybrid micro-grid system AO and an alternating current and direct current hybrid micro-grid system BO; the alternating current and direct current hybrid micro-grid system AO comprises a power grid and a first generator set, the power grid and the first generator set are connected with S1 static change-over switches STS through 380V alternating current buses, the two S1 static change-over switches STS are connected with an energy storage converter PPSA1 through connecting lines, and the energy storage converter PPSA1 is connected with the first generator set through connecting lines. According to the invention, two sets of AC / DC hybrid micro-grid systems are utilized, bidirectional energy flow between a 750V DC bus and a 1500V DC bus is established, switching of different voltage levels in different AC / DC hybrid micro-grids is realized, automatic switching under different AC / DC hybrid micro-grid application scenarios can be satisfied, and meanwhile, the system has the functions of independent system self-control, low power consumption and the like. And cross-regional energy interaction can be effectively realized, and different power utilization requirements are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of microgrids, and in particular relates to an AC / DC hybrid microgrid system and an implementation method thereof. Background Art

[0002] In recent years, with the continuous development of society, people's demand for energy has also continued to grow. Among them, the continuous consumption of traditional energy and environmental protection have been faced with unprecedented challenges. Based on the demand for electricity, the centralized public power grid that has developed rapidly in the past few decades can no longer meet the current more complex and diversified electricity demand.

[0003] Due to the fragility of centralized power grids, once a large-scale power outage occurs, it will seriously affect the normal activities of human production and life. Based on this situation, microgrid distributed power systems have emerged, among which distributed power generation systems such as photovoltaics, wind power, and energy storage have developed on a large scale. At present, microgrids are mainly divided into DC microgrids and AC microgrids, and AC microgrids are still the most widely used form of microgrids. In AC microgrid systems, distributed power generation systems such as photovoltaics and wind power will be aggregated to the AC bus through DC to AC conversion, and finally used by AC loads. However, there are also DC loads in the loads. If DC loads need to be powered in AC microgrids, AC needs to be converted into DC. Multiple conversions of AC are likely to increase the power loss of the entire system.

[0004] The limitations of a single microgrid make it easy for an AC microgrid to generate harmonics when connected in parallel to the grid, which can affect the grid. In addition, the bus voltage level of a single microgrid is single and cannot meet the requirements of different voltage levels. It can only independently control a single microgrid system and cannot achieve independent control and flexible deployment of AC and DC microgrids, which makes it impossible to apply to multiple application scenarios at the same time. For example, the bus voltage and grid of a single microgrid can only be used in industrial and commercial energy storage, and it is impossible to switch the microgrid application scenario according to different power supply needs. Summary of the invention

[0005] The purpose of the present invention is to provide an AC / DC hybrid microgrid system and implementation method, aiming to solve the limitations of a single microgrid, provide stable and reliable power when the power grid is unstable or fails, and solve the application requirements of different voltage levels and different loads. Through the energy interaction between different AC / DC microgrid hybrid systems and the high-voltage 1500VDC and 750VDC DC busbars, switching between industrial and commercial storage application scenarios and ground power station application scenarios can be achieved, and various power requirements can be flexibly adapted.

[0006] As a preferred AC / DC hybrid microgrid system of the present invention, the system comprises: an AC / DC hybrid microgrid system AO and an AC / DC hybrid microgrid system BO; The AC / DC hybrid microgrid system AO includes: a power grid and a first generator set, the power grid and the first generator set are connected to an S1 static conversion switch STS through a 380V AC bus, and the two S1 static conversion switches STS are connected to an energy storage converter PSPA1 through a connecting line, the energy storage converter PSPA1, the energy storage converter PSPA1 is connected to a bidirectional DCDC battery energy storage module through a 750V DC bus, and the energy storage converter PSPA1 is connected to a bidirectional DC / DC charging pile A3 through a 750V DC bus, and the energy storage converter PSPA1 is also connected to a photovoltaic string power generation module through a 750V DC bus. block, one end of the 750V DC bus is also connected to a bidirectional DC / DCA5; the AC / DC hybrid microgrid system BO includes: a high-voltage power grid and a second generator set, the high-voltage power grid and the second generator set are both connected to the S2 static conversion switch STS through an 800V AC bus, the two S2 static conversion switches STS are connected to the energy storage converter PSPB1 through a connecting line, the energy storage converter PSPB1 is also connected to a bidirectional DCDC battery energy storage module, a bidirectional DC / DC charging pile B3 and a photovoltaic string power generation module through a 1500V DC bus, and one end of the 1500V DC bus is also connected to a bidirectional DC / DCB5.

[0007] As a preferred AC / DC hybrid microgrid system of the present invention, the photovoltaic string power generation module in the AC / DC hybrid microgrid system AO includes: unidirectional DC / DCA2 and photovoltaic components, the photovoltaic components are connected to the unidirectional DC / DCA2 through a connecting line, and the unidirectional DC / DCA2 is connected to the 750V DC bus through a connecting line. The photovoltaic string power generation module in the AC / DC hybrid microgrid system BO includes: unidirectional DC / DCB2 and photovoltaic components, the photovoltaic components are connected to the unidirectional DC / DCB2 through a connecting line, and the unidirectional DC / DCB2 is connected to the 1500V DC bus through a connecting line.

[0008] As a preferred AC / DC hybrid microgrid system of the present invention, the bidirectional DCDC battery energy storage module in the AC / DC hybrid microgrid system AO includes: a bidirectional DC / DCA4 and a battery, the battery is connected to the bidirectional DC / DCA4 through a connecting line, and the bidirectional DC / DCA4 is also connected to a 750V DC bus through a connecting line. The bidirectional DCDC battery energy storage module in the AC / DC hybrid microgrid system BO includes: a bidirectional DC / DCB4 and a battery, the battery is connected to the bidirectional DC / DCB4 through a connecting line, and the bidirectional DC / DCB4 is also connected to a 1500V DC bus through a connecting line.

[0009] As a preferred AC / DC hybrid microgrid system of the present invention, the AC / DC hybrid microgrid system AO is also connected to S1 static transfer switch STS, energy storage converter PSPA1, unidirectional DC / DC A2, bidirectional DC / DC charging pile A3 and bidirectional DC / DC A4.

[0010] As a preferred AC / DC hybrid microgrid system of the present invention, the AC / DC hybrid microgrid system BO is also connected to S2 static switching switch STS, energy storage converter PSPB1, unidirectional DC / DCB2, bidirectional DC / DC charging pile B3 and bidirectional DC / DCB4.

[0011] As a preferred AC / DC hybrid microgrid system of the present invention, the bidirectional DC / DCA5 set in the AC / DC hybrid microgrid system AO is connected to the 1500V DC bus set in the AC / DC hybrid microgrid system BO through a connecting line, and the bidirectional DC / DCB5 set in the AC / DC hybrid microgrid system BO is connected to the 750V DC bus set in the AC / DC hybrid microgrid system AO.

[0012] As a preferred AC / DC hybrid microgrid system of the present invention, the 380V AC bus and the 800V AC bus set in the AC / DC hybrid microgrid system AO and the AC / DC hybrid microgrid system BO are both provided with AC load modules, and the 750V DC bus and the 1500V DC bus set in the AC / DC hybrid microgrid system AO and the AC / DC hybrid microgrid system BO are both provided with DC load modules.

[0013] As a preferred embodiment of an AC / DC hybrid microgrid system of the present invention, the bidirectional DC / DC charging pile A3 and the bidirectional DC / DC charging pile B3 can be connected to the new energy vehicle via a connecting line.

[0014] As a preferred implementation method of an AC / DC hybrid microgrid system of the present invention, the implementation method of the AC / DC hybrid microgrid system according to claims 1-8 comprises the following steps: the AC / DC hybrid microgrid system AO and the AC / DC hybrid microgrid system BO can be used to control and dispatch energy for the power grid, generator set, energy storage converter, bidirectional DCDC battery energy storage module, bidirectional DC / DC charging pile, photovoltaic string power generation module and switch in the system; the energy storage converter is actually a bidirectional DC / AC, which can convert the AC power of the power grid into reactive power through the DC bus inverter, and then can be used to adjust the reactive power of the power grid, and can be used in conjunction with the static transfer switch STS for on-grid and off-grid operation; The DC voltage generated by the photovoltaic components in the photovoltaic string power generation module is converted into DC through a unidirectional DC / DC to provide power for the DC bus; the bidirectional DC / DC charging pile performs bidirectional DC conversion with the DC bus to achieve bidirectional energy flow; the battery in the bidirectional DCDC battery energy storage module is connected to the DC bus through bidirectional DC / DC bidirectional DC conversion to provide power for the DC bus; the DC buses on the AC / DC hybrid microgrid system AO and the AC / DC hybrid microgrid system BO are interconnected through bidirectional DC / DCA5 and bidirectional DC / DCB5, so that the voltages of the DC buses of the two can be converted to each other to achieve bidirectional energy flow.

[0015] As a preferred implementation method of an AC / DC hybrid microgrid system of the present invention, the AC / DC hybrid microgrid system AO and the AC / DC hybrid microgrid system BO can respectively stop the conversion work by controlling the bidirectional DC / DCA5 and the bidirectional DC / DCB5, so that the connection between the AC / DC hybrid microgrid system AO and the AC / DC hybrid microgrid system BO is disconnected, so that the two can be independently controlled.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention utilizes two sets of AC / DC hybrid microgrid systems to establish a two-way flow of energy between a 750V DC bus and a 1500V DC bus, and realizes switching of different voltage levels in different AC / DC hybrid microgrids. It can meet the automatic switching requirements under different AC / DC hybrid microgrid application scenarios, and at the same time has independent system self-control, which can effectively realize cross-regional energy interaction and solve different electricity demands. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the composition structure of the present invention; Figure 2 It is a schematic diagram of a single system structure of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-2 The present invention provides the following technical solutions: an AC / DC hybrid microgrid system, the system comprising: an AC / DC hybrid microgrid system AO1 and an AC / DC hybrid microgrid system BO2; the AC / DC hybrid microgrid system AO1 comprises: a power grid 101 and a first generator set 102, the power grid 101 and the first generator set 102 are both connected to an S1 static conversion switch STS103 through a 380V AC bus, and the two S1 static conversion switches STS103 are connected to an energy storage converter PSPA1104 through a connecting line, the energy storage converter PSPA1104, the energy storage converter PSPA1104 is connected to a bidirectional DCDC battery energy storage module through a 750V DC bus, and the energy storage converter PSPA1104 is connected to a bidirectional DC / DC charging pile A3106 through a 750V DC bus, and the energy storage converter PSPA1104 is connected to a bidirectional DC / DC charging pile A3106 through a 750V DC bus. The converter PSPA1104 is also connected to a photovoltaic string power generation module through a 750V DC bus, and a bidirectional DC / DCA51010 is also connected to one end of the 750V DC bus; the AC / DC hybrid microgrid system BO2 includes: a high-voltage power grid 201 and a second generator set 202, both of which are connected to the S2 static transfer switch STS203 through an 800V AC bus, and the two S2 static transfer switches STS203 are connected to the energy storage converter PSPB1204 through a connecting line, and the energy storage converter PSPB1204 is also connected to a bidirectional DCDC battery energy storage module, a bidirectional DC / DC charging pile B3207 and a photovoltaic string power generation module through a 1500V DC bus, and a bidirectional DC / DCB5205 is also connected to one end of the 1500V DC bus.

[0020] Preferably: the photovoltaic string power generation module in the AC / DC hybrid microgrid system AO1 includes: unidirectional DC / DCA2105 and photovoltaic assembly 108, the photovoltaic assembly 108 is connected to the unidirectional DC / DCA2105 through a connecting line, and the unidirectional DC / DCA2105 is connected to the 750V DC bus through a connecting line. The photovoltaic string power generation module in the AC / DC hybrid microgrid system BO2 includes: unidirectional DC / DCB2206 and photovoltaic assembly 108, the photovoltaic assembly 108 is connected to the unidirectional DC / DCB2206 through a connecting line, and the unidirectional DC / DCB2206 is connected to the 1500V DC bus through a connecting line.

[0021] It should be noted that the DC voltage generated by the photovoltaic assembly 108 of the AC / DC hybrid microgrid system AO1 is connected to the 750V DC bus through the unidirectional DC / DCA2105 to provide power, while the DC voltage generated by the photovoltaic assembly 108 of the AC / DC hybrid microgrid system BO2 is connected to the 1500V DC bus through the unidirectional DC / DCB2206 to provide power.

[0022] Preferably: the bidirectional DCDC battery energy storage module in the AC / DC hybrid microgrid system AO1 includes: bidirectional DC / DCA4107 and battery 109, battery 109 is connected to the bidirectional DC / DCA4107 through a connecting line, and the bidirectional DC / DCA4107 is also connected to the 750V DC bus through a connecting line. The bidirectional DCDC battery energy storage module in the AC / DC hybrid microgrid system BO2 includes: bidirectional DC / DCB4208 and battery 109, battery 109 is connected to the bidirectional DC / DCB4208 through a connecting line, and the bidirectional DC / DCB4208 is also connected to the 1500V DC bus through a connecting line.

[0023] It should be noted that the battery 109 in the AC / DC hybrid microgrid system AO1 is transformed through the bidirectional DC / DCA4107 and connected to the 750V DC bus to provide power, while the battery 109 in the AC / DC hybrid microgrid system BO2 is transformed through the bidirectional DC / DCB4208 and connected to the 1500V DC bus to provide power.

[0024] Preferably: the AC / DC hybrid microgrid system AO1 is also connected to an S1 static transfer switch STS103, an energy storage converter PSPA1104, a unidirectional DC / DC A2105, a bidirectional DC / DC charging pile A3106 and a bidirectional DC / DC A4107.

[0025] It should be noted that the AC / DC hybrid microgrid system AO1 can schedule switches and energy in the system.

[0026] Preferably: the AC / DC hybrid microgrid system BO2 is also connected to an S2 static transfer switch STS203, an energy storage converter PSPB1204, a unidirectional DC / DCB2206, a bidirectional DC / DC charging pile B3207 and a bidirectional DC / DCB4208.

[0027] It should be noted that the AC / DC hybrid microgrid system BO2 can schedule switches and energy in the system.

[0028] Preferably: the bidirectional DC / DCA51010 provided in the AC / DC hybrid microgrid system AO1 is connected to the 1500V DC bus provided in the AC / DC hybrid microgrid system BO2 through a connecting line, and the bidirectional DC / DCB5205 provided in the AC / DC hybrid microgrid system BO2 is connected to the 750V DC bus provided in the AC / DC hybrid microgrid system AO1.

[0029] It should be noted that: in this way, the DC buses on the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 are interconnected by setting up the bidirectional DC / DCA51010 and the bidirectional DC / DCB5205, thereby establishing a bidirectional flow of energy between the 750V DC bus and the 1500V DC bus, and realizing switching of different voltage levels in different AC / DC hybrid microgrids.

[0030] Preferably: the 380V AC bus and the 800V AC bus set in the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 are both provided with AC load modules, and the 750V DC bus and the 1500V DC bus set in the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 are both provided with DC load modules.

[0031] It should be noted that: the AC load module and the DC load module can be used to monitor the power supply load of the AC bus and the DC bus.

[0032] Preferably: the bidirectional DC / DC charging pile A3106 and the bidirectional DC / DC charging pile B3207 can be connected to the new energy vehicle via a connecting line.

[0033] It should be noted that the new energy vehicles in the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 can be connected to the DC bus through bidirectional DC / DC charging piles A3106 and B3207 for bidirectional DC conversion, thereby providing power and realizing bidirectional energy flow.

[0034] A method for implementing an AC / DC hybrid microgrid system, the method for implementing an AC / DC hybrid microgrid system according to claims 1-8 comprising the following steps: the power grid, generator set, energy storage converter, bidirectional DCDC battery energy storage module, bidirectional DC / DC charging pile, photovoltaic string power generation module and switch in the system can be controlled and energy dispatched through the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2; the energy storage converter is actually a bidirectional DC / AC, which can invert the AC power of the power grid through the DC bus, adjust the reactive and active power of the power grid, and can be connected to and disconnected from the grid by combining with the static transfer switch STS; the photovoltaic string power generation The DC voltage generated by the photovoltaic module is converted into DC through a unidirectional DC / DC to provide power for the DC bus; the bidirectional DC / DC charging pile performs bidirectional DC conversion with the DC bus to achieve bidirectional energy flow; the battery in the bidirectional DCDC battery energy storage module is converted to the DC bus through a bidirectional DC / DC to provide power for the DC bus; the DC buses on the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 are interconnected through bidirectional DC / DCA51010 and bidirectional DC / DCB5205, so that the voltages of the DC buses of the two can be converted to each other, achieving bidirectional energy flow.

[0035] Preferably, the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 can stop the conversion work by controlling the bidirectional DC / DCA51010 and the bidirectional DC / DCB5205 respectively, so that the connection between the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 is disconnected, so that the two can be independently controlled.

[0036] Working principle: The AC / DC hybrid microgrid system AO1 is mainly used in industrial and commercial electricity scenarios, while the AC / DC hybrid microgrid system BO2 is mainly used in large ground power stations. When the AC / DC hybrid microgrid system AO1 is in use, when the power grid 101 has electricity, when the AC and DC load power is less than the output power of the photovoltaic string power generation module, the photovoltaic string power generation module will give priority to providing energy to the DC load, and through the energy storage inverter PSPA1104 and the S1 static conversion switch STS103, it will be connected to the grid and converted to power the AC load. At this time, the excess electricity generated by the photovoltaic string power generation module will be used to charge the new energy vehicle through the bidirectional DC / DC charging pile A3106 and the battery 109 will be charged through the bidirectional DC / DCA4107. In this mode, the grid 101 does not need to provide energy. When the power generation of the photovoltaic string generation module is less than the AC and DC load demand, the photovoltaic string generation module and the battery 109 simultaneously transmit energy to the AC and DC load. At this time, the grid 101 still does not need to provide energy to the load. When the power generation of the photovoltaic string generation module and the battery 109 is less than the AC and DC load demand, the grid 101 participates in the operation by controlling the energy storage inverter PSPA1104 and the S1 static conversion switch STS103 to achieve grid-connected operation, so that energy flows in both directions, thereby giving priority to powering the AC and DC loads. At the same time, the battery 109 is charged and stored through the bidirectional DC / DCA4107. When the grid 101 fails or is disconnected When the power generated by the PV string generation module and the battery 109 is less than the power required by the AC and DC loads, the first generator set 102 is involved in the operation by controlling the energy storage inverter PSPA1104 and cooperating with the S1 static conversion switch STS103 to realize off-grid operation, so that energy can flow in both directions, and the AC and DC loads can be powered first. The excess energy can also be charged and stored in the battery 109 through the bidirectional DC / DCA4107. When the AC and DC load power is less than the output power of the PV string generation module and the power generated by the PV string generation module is less than the AC and DC load demand, the operation of the system is the same as when the grid 101 is powered. Secondly, when the DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system AO1 are connected, the AC and DC loads can be powered by the battery 109. When the power grid system BO2 is interconnected through the bidirectional DC / DCA51010 and the bidirectional DC / DCB5205, a bidirectional flow of energy between the 750V DC bus and the 1500V DC bus can be established. When a large-scale power outage occurs in the DC hybrid microgrid system AO1 and the needs of the existing AC and DC loads cannot be met, the AC / DC hybrid microgrid system BO2 can control the bidirectional DC / DCB5205 to convert the voltage on the 1500V DC bus to the 750V DC bus, thereby supplying power to the entire DC hybrid microgrid system AO1, ensuring that the DC hybrid microgrid system AO1 can operate normally. At the same time, energy can also be stored in the battery 109 for emergency use.When the high-voltage grid 201 in the AC / DC hybrid microgrid system BO2 fails and fails to meet the AC and DC load requirements, the DC hybrid microgrid system AO1 can convert the voltage of the 750V DC bus to the 1500V DC bus by controlling the bidirectional DC / DCA51010. At this time, the generator sets, bidirectional DCDC battery energy storage modules and photovoltaic string power generation modules inside the DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 will all function to the AC and DC loads to ensure the normal operation of the AC / DC hybrid microgrid system BO2. This operation can realize switching between different voltage levels in different AC / DC hybrid microgrids, meet the automatic switching under different AC / DC hybrid microgrid application scenarios, effectively realize cross-regional energy interaction, and solve different When the DC load demand of one of the DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 is too large, the bidirectional DCDC battery energy storage module and photovoltaic string power generation module of one system can supply energy to the DC load of the other system, which can effectively avoid the use of the system's own grid to provide energy and reduce the harmonic problem of the AC end supplying power to the DC load. When the power supply in the DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 is stable, the two do not need to support each other. At this time, the bidirectional DC / DCA51010 and the bidirectional DC / DCB5205 can be controlled to stop the conversion work, so that the connection between the AC / DC hybrid microgrid system AO1 and the AC / DC hybrid microgrid system BO2 is disconnected, so that the two can be controlled independently.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An AC / DC hybrid microgrid system, characterized in that: The system comprises: an AC / DC hybrid microgrid system AO (1) and an AC / DC hybrid microgrid system BO (2); The AC / DC hybrid microgrid system AO (1) comprises: a power grid (101) and a first generator set (102), wherein the power grid (101) and the first generator set (102) are both connected to an S1 static transfer switch STS (103) via a 380V AC bus, and the two S1 static transfer switches STS (103) are connected to an energy storage converter PSPA1 (104) via a connecting line, wherein the energy storage converter PSPA1 (104) is connected to a bidirectional DCDC battery energy storage module via a 750V DC bus, and the energy storage converter PSPA1 (104) is connected to a bidirectional DC / DC charging pile A3 (106) via a 750V DC bus, and the energy storage converter PSPA1 (104) is also connected to a photovoltaic string power generation module via a 750V DC bus, and one end of the 750V DC bus is also connected to a bidirectional DC / DC A5 (1010); The AC / DC hybrid microgrid system BO (2) comprises: a high-voltage power grid (201) and a second generator set (202); the high-voltage power grid (201) and the second generator set (202) are both connected to an S2 static transfer switch STS (203) via an 800V AC bus; the two S2 static transfer switches STS (203) are connected to an energy storage converter PSPB1 (204) via a connecting line; the energy storage converter PSPB1 (204) is also connected to a bidirectional DCDC battery energy storage module, a bidirectional DC / DC charging pile B3 (207) and a photovoltaic string power generation module via a 1500V DC bus; one end of the 1500V DC bus is also connected to a bidirectional DC / DC B5 (205).

2. The AC / DC hybrid microgrid system according to claim 1, characterized in that: The photovoltaic string power generation module in the AC / DC hybrid microgrid system AO (1) comprises: a unidirectional DC / DCA2 (105) and a photovoltaic assembly (108), wherein the photovoltaic assembly (108) is connected to the unidirectional DC / DCA2 (105) via a connecting line, and the unidirectional DC / DCA2 (105) is connected to a 750V DC bus via a connecting line. The photovoltaic string power generation module in the AC / DC hybrid microgrid system BO (2) comprises: a unidirectional DC / DCB2 (206) and a photovoltaic assembly (108), wherein the photovoltaic assembly (108) is connected to the unidirectional DC / DCB2 (206) via a connecting line, and the unidirectional DC / DCB2 (206) is connected to a 1500V DC bus via a connecting line.

3. The AC / DC hybrid microgrid system according to claim 1, characterized in that: The bidirectional DCDC battery energy storage module in the AC / DC hybrid microgrid system AO (1) comprises: a bidirectional DC / DCA4 (107) and a battery (109), wherein the battery (109) is connected to the bidirectional DC / DCA4 (107) via a connecting line, and the bidirectional DC / DCA4 (107) is also connected to a 750V DC bus via a connecting line. The bidirectional DCDC battery energy storage module in the AC / DC hybrid microgrid system BO (2) comprises: a bidirectional DC / DCB4 (208) and a battery (109), wherein the battery (109) is connected to the bidirectional DC / DCB4 (208) via a connecting line, and the bidirectional DC / DCB4 (208) is also connected to a 1500V DC bus via a connecting line.

4. The AC / DC hybrid microgrid system according to claim 1, characterized in that: The AC / DC hybrid microgrid system AO (1) is also connected to an S1 static transfer switch STS (103), an energy storage converter PSPA1 (104), a unidirectional DC / DC A2 (105), a bidirectional DC / DC charging pile A3 (106) and a bidirectional DC / DC A4 (107).

5. The AC / DC hybrid microgrid system according to claim 1, characterized in that: The AC / DC hybrid microgrid system BO (2) is also connected to a static transfer switch STS (203), an energy storage converter PSPB1 (204), a unidirectional DC / DC B2 (206), a bidirectional DC / DC charging pile B3 (207) and a bidirectional DC / DC B4 (208).

6. The AC / DC hybrid microgrid system according to claim 1, characterized in that: The bidirectional DC / DC A5 (1010) provided in the AC / DC hybrid microgrid system AO (1) is connected to a 1500V DC bus provided in the AC / DC hybrid microgrid system BO (2) via a connecting line, and the bidirectional DC / DC B5 (205) provided in the AC / DC hybrid microgrid system BO (2) is connected to a 750V DC bus provided in the AC / DC hybrid microgrid system AO (1).

7. The AC / DC hybrid microgrid system according to claim 1, characterized in that: The 380V AC busbar and the 800V AC busbar provided in the AC / DC hybrid microgrid system AO (1) and the AC / DC hybrid microgrid system BO (2) are both provided with AC load modules, and the 750V DC busbar and the 1500V DC busbar provided in the AC / DC hybrid microgrid system AO (1) and the AC / DC hybrid microgrid system BO (2) are both provided with DC load modules.

8. The AC / DC hybrid microgrid system according to claim 1, characterized in that: The bidirectional DC / DC charging pile A3 (106) and the bidirectional DC / DC charging pile B3 (207) can be connected to the new energy vehicle via a connecting line.

9. A method for implementing an AC / DC hybrid microgrid system, characterized in that: The method for implementing the AC / DC hybrid microgrid system according to claims 1 to 8 comprises the following steps: controlling and scheduling the power grid, generator set, energy storage converter, bidirectional DCDC battery energy storage module, bidirectional DC / DC charging pile, photovoltaic string power generation module and switch in the system through the AC / DC hybrid microgrid system AO (1) and the AC / DC hybrid microgrid system BO (2); The energy storage converter is actually a bidirectional DC / AC, which can invert the AC power of the power grid through the DC bus, adjust the reactive power of the power grid, and can be connected and disconnected with the static transfer switch STS; The photovoltaic string power generation module converts the DC voltage generated by the photovoltaic module into DC through a unidirectional DC / DC to provide power for the DC bus; The bidirectional DC / DC charging pile performs bidirectional DC conversion with the DC bus, thereby realizing bidirectional energy flow; The batteries in the bidirectional DCDC battery energy storage module are connected to the DC bus through bidirectional DC / DC bidirectional DC conversion to provide power for the DC bus; The DC buses on the AC / DC hybrid microgrid system AO (1) and the AC / DC hybrid microgrid system BO (2) are connected to each other via a bidirectional DC / DCA5 (1010) and a bidirectional DC / DCB5 (205), so that the voltages of the DC buses of the two can be converted to each other, thereby realizing a bidirectional flow of energy.

10. The method for implementing an AC / DC hybrid microgrid system according to claim 9, characterized in that: The AC / DC hybrid microgrid system AO (1) and the AC / DC hybrid microgrid system BO (2) can respectively stop the conversion work by controlling the bidirectional DC / DC A5 (1010) and the bidirectional DC / DC B5 (205), so that the connection between the AC / DC hybrid microgrid system AO (1) and the AC / DC hybrid microgrid system BO (2) is disconnected, so that the two can be independently controlled.

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