Expressway service area energy supply micro-grid system and management method thereof

Abstract

The invention discloses an expressway service area energy supply micro-grid system and a management method thereof. The micro-grid system comprises a power supply subsystem for providing a power supply, an energy storage subsystem for storing energy, a flexible power transmission and distribution subsystem for regulating and controlling electric power change and performing electric power transmission and a load, and the flexible power transmission and distribution subsystem comprises a plurality of middle-distance high-voltage electric energy routers, mutual-aid high-voltage electric energy routers and low-voltage electric energy routers. Distributed AC / DC power supplies, load integrated management and bidirectional power change are realized through an electric energy routing technology. According to the invention, the scheduling management among energy, energy storage and load in the service area at each side of the expressway and the electric power resource between the opposite service areas can be mutually supplemented, so that the utilization of the new energy power generation resource of the service area is fully adapted to the power demand of the expressway.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and in particular to the technical field of flexible perovskite solar cells. Background Art

[0002] With the rapid popularization of electric vehicles and new energy vehicles, the demand for charging facilities in highway service areas is increasing, while the traditional power supply method is not only difficult to fully utilize renewable energy, but also prone to supply shortages during peak power loads. Therefore, the establishment of a service area energy supply microgrid system that can effectively utilize a variety of non-traditional energy forms such as solar energy and wind energy and achieve self-consistency and stable supply within the system is an urgent problem to be solved by existing technologies. Summary of the invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a highway service area energy supply microgrid system and a management method thereof. The microgrid system can coordinate the scheduling management of energy, energy storage and loads in the service areas on each side of the highway with the power resources between the opposite service areas, so that the utilization of new energy power generation resources in the service areas is fully adapted to the power consumption tide of the highway vehicles, thereby realizing self-consistent and stable supply of energy within the system.

[0004] The technical solution of the present invention is as follows:

[0005] A highway service area energy supply microgrid system, comprising: a structural system and a management system for intelligently managing the structural system; wherein the structural system comprises: a power supply subsystem for providing power, an energy storage subsystem for energy storage, a flexible transmission and distribution electronic system for regulating power changes and transmitting electric power, and a load; the power supply subsystem comprises: new energy power generation equipment arranged outside the service area, namely, slope new energy power generation equipment, a plurality of new energy power generation equipment distributedly arranged in the service areas on each side, namely, service area new energy power generation equipment, and a distribution transformer that can use the power of the existing public power grid in the highway service area as a backup power supply; the energy storage subsystem comprises a plurality of energy storage equipment distributedly arranged in the service areas on each side; the flexible transmission and distribution electronic system comprises: a power generation current of the slope new energy power generation equipment is converted into a DC form and supplied to a medium-distance high-voltage power router in the service area on either side or both sides, and power is transmitted between the service areas on both sides and inside and outside the service areas, and is connected to the medium-distance high-voltage power router A plurality of mutually beneficial high-voltage power routers electrically connected by devices, a plurality of low-voltage power routers distributed in the service areas on each side and electrically connected to the new energy power generation equipment in the service area, the energy storage equipment and the mutually beneficial high-voltage power router, and a power transmission line for connecting the backup power supply to the power grid in the system through the low-voltage power router, wherein a medium-distance high-voltage direct current transmission line, namely a medium-distance high-voltage direct current line, is formed between the slope new energy power generation equipment and the medium-distance high-voltage power router, a high-voltage direct current transmission route for energy mutual assistance distributed between the two sides, namely, the opposite service areas, is formed between the medium-distance high-voltage power router and the mutually beneficial high-voltage power router and between the mutually beneficial high-voltage power routers, namely, an opposite double-station energy mutual assistance high-voltage direct current line; an interconnected direct current transmission route within a single-side service area, namely, an in-station intelligent direct current bus, is formed between the mutually beneficial high-voltage power router and the low-voltage power router and between the low-voltage power routers; and the load is electrically connected to the low-voltage power router.

[0006] According to some preferred embodiments of the present invention, the new energy power generation equipment includes a photovoltaic power station, and the load includes a DC charging pile.

[0007] According to some preferred embodiments of the present invention, the energy storage device comprises an electrochemical battery, a capacitor or a battery-capacitor composite energy storage device.

[0008] According to some preferred embodiments of the present invention, the microgrid system forms a topological structure including a local layer, a station layer, a system layer and a backup layer, wherein the local layer includes: the low-voltage power router in any service area on a single side, the service area new energy power generation equipment connected to and managed by it, the energy storage equipment and the load and the connecting lines between them; the station layer includes: the intelligent DC bus that interconnects all the local layers on a single side and the connecting lines between it and the low-voltage power router in the local layer; the system layer includes: the high-voltage power router that connects and supplies power to two opposite station layers, the medium-distance high-voltage power router, the slope new energy power generation equipment and the connecting lines between them; the backup layer includes: the distribution transformer that introduces the backup power supply into the station layer, the power grid transmission line and the connecting lines between it and the low-voltage power router.

[0009] The management system includes: a management module component and a management platform for centrally controlling the management module component, wherein the management module component includes: a first power electronic module with multi-port input and output arranged on the medium-distance high-voltage power router and integrating an AC / DC converter, a DC / DC converter and a photovoltaic PCS, a multi-port DC / DC converter module arranged on the Huji high-voltage power router, a second power electronic module with multi-port bidirectional conversion arranged on the low-voltage power router and integrating an AC / DC converter, a DC / DC converter and a photovoltaic DC / DC converter with an MPPT function, and a voltage adjustment module arranged on the intelligent DC bus.

[0010] The present invention further provides a management method for the above microgrid system, which includes: the management platform uses the power grid transmission lines, intelligent DC busbars, mutual aid high-voltage DC lines, medium-distance high-voltage DC lines and all equipment connected to these lines as the physical basis for energy regulation, uses the operating data of all equipment as the basis for energy regulation, and uses energy self-consistency as the energy regulation target to perform energy regulation.

[0011] And / or, the management platform controls to adjust the on-off duty cycle of the power tube of the AC / DC converter in the first power electronic module and / or the second power electronic module for rectification conversion, so as to convert the AC input of the backup power supply into a DC output entering the microgrid system; the management platform controls to adjust the chopping control duty cycle of the DC / DC converter in one or more of the first power electronic module, the multi-port DC / DC converter module and the second power electronic module, so as to control the input and output voltage of each power router; the management platform controls to adjust the on-off duty cycle of the power tube of the photovoltaic DC / DC converter in the second power electronic module, so as to dynamically track the maximum power output state of the photovoltaic output; the management platform controls to adjust the voltage adjustment module, so as to realize the voltage of the intelligent DC bus

[0012] The 700Vdc-1000Vdc range changes dynamically based on demand.

[0013] According to some preferred embodiments of the present invention, the dynamic change includes:

[0014] Calculate the real-time weighted average power efficiency value of each subsystem in the microgrid system as follows:

[0015] η N =(η1*P1+η2*P2+…η i *P i ) / (P1+P2+…P N ),

[0016] Among them, η i represents the efficiency value of the ith subsystem, P i Represents the real-time power value of the i-th subsystem;

[0017] According to η i According to the changing trend of the DC bus, the specific voltage operating value of the DC bus is adjusted within 700Vdc-1000Vdc, so that the power efficiency value η of the microgrid system N+1 Meet expectations.

[0018] The present invention further provides a management method for the above microgrid system, which adopts four management strategies to manage the microgrid system according to the energy supply situation of the highway service area, including a single-station self-circulation strategy, a single-station grid-connected strategy, a mutual-aid self-circulation strategy and a mutual-aid grid-connected strategy, wherein the single-station self-circulation strategy includes: when each local layer in the field station layer on each side can achieve a balance of energy, energy storage and load, that is, realize autonomous operation, the management system controls the microgrid system to use a single local layer as an energy supply unit, and does not interconnect the local layers and connect the field station layers on both sides and the standby layer; the single-station grid-connected strategy includes: when the local layer in the field station layer on either side cannot fully realize autonomous operation, but it can realize self-consistent operation in the field station layer on that side, the management system controls the The local layers within the field station layer on this side of the microgrid system are interconnected and / or the local layer is connected to the backup layer, and the field station layers on both sides are not connected; the mutual aid self-circulation strategy includes: when the local layer within the field station layer on either side and the field station layer cannot achieve self-consistent operation, but can achieve self-consistent operation on the system layer through the energy supply provided by the field station layer on the other side, the management system controls the field station layers on both sides of the microgrid system to be connected, and does not connect the field station layer with the backup layer; the mutual aid grid-connected strategy includes: when the local layer within the field station layer on either side and the field layer cannot achieve self-consistent operation, and cannot achieve self-consistent operation on the system layer through the energy supply provided by the field station layer on the other side, the management system controls the field station layers on both sides of the microgrid system to be connected, and connected with the backup layer.

[0019] The present invention has the following beneficial effects:

[0020] The present invention can use power routing technology to perform distributed AC and DC power supply and load integrated management and bidirectional power change with power routers as key nodes, realize plug-and-play of power supply, energy storage and load equipment, enhance the dynamic scalability of the entire system, and enable the service area to flexibly increase or decrease power supply, energy storage and charging facilities according to the seasonal changes in the power demand of the vehicle group while ensuring the balance of source-grid-load-storage, thereby reducing operating investment and maintenance costs.

[0021] The present invention can plan multiple microgrids in the traffic network to form a microgrid group, and optimize the layout of each microgrid in the microgrid group by combining the new energy generation, energy storage capacity, and electricity demand in the service area. The planning and layout of the microgrid is combined with the actual situation of the service area to meet the charging needs of electric vehicles and basic load electricity in the service area, achieve energy self-sufficiency, and have good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the composition structure of the energy supply microgrid system of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the embodiments and drawings, but it should be understood that the embodiments and drawings are only used to exemplify the present invention and do not constitute any limitation on the protection scope of the present invention. All reasonable changes and combinations within the scope of the inventive concept of the present invention fall within the protection scope of the present invention.

[0024] Refer to the attached Figure 1 ,In some specific implementations, the highway service area energy supply microgrid system of the present invention includes: a structural system and a management system;

[0025] The structural system includes: a power supply subsystem for providing power, an energy storage subsystem for storing energy, a flexible transmission and distribution electronic system for regulating power changes and transmitting electric power, and a load;

[0026] The power subsystem includes: a new energy power generation system such as a photovoltaic power generation system, i.e., a slope photovoltaic power station 3, which is arranged outside the service area; multiple photovoltaic power generation systems, i.e., a service area photovoltaic power station 5, which are distributed and arranged in the service areas on each side; and a distribution transformer 8 which can use the power of the existing public power grid in the highway service area as a backup power source;

[0027] The energy storage subsystem includes a plurality of energy storage devices 6 distributedly arranged in the service areas on each side;

[0028] The flexible transmission and distribution electronic system includes: converting the generated current of the slope photovoltaic power station 3 located outside the service area into a DC form and supplying it to the medium-distance high-voltage power router 1 in the service area on either side or both sides, transmitting power between the service areas on both sides and inside and outside the service areas and electrically connected to the medium-distance high-voltage power router 1 with multiple mutual aid high-voltage power routers 2, multiple low-voltage power routers 4 distributed in the service areas on each side and electrically connected to the service area photovoltaic power station 5, energy storage equipment 6 and the mutual aid high-voltage power router 2, and connecting the backup power supply to the distribution network 0.4kv AC power supply line in the system through the low-voltage power router 4, that is, the power grid transmission line 12, wherein the slope photovoltaic power station 3 is a power supply line of the slope photovoltaic power station 3, and the power supply line of ... A medium-distance high-voltage direct current transmission line, namely, a medium-distance high-voltage direct current line 9, is formed between the voltaic power station 3 and the medium-distance high-voltage power router 1; a high-voltage direct current transmission route for energy mutual assistance between service areas on both sides, namely, an opposite double-station energy mutual assistance high-voltage direct current line 10, is formed between the medium-distance high-voltage power router 1 and the mutual assistance high-voltage power router 2 and between the mutual assistance high-voltage power routers 2; an interconnected direct current transmission route within a single-side service area, namely, an in-station intelligent direct current bus 11, is formed between the mutual assistance high-voltage power router 2 and the low-voltage power router 4 and between the low-voltage power routers 4; a load such as a DC charging column 7 is electrically connected to the low-voltage power router 4.

[0029] In the above structural system, the slope photovoltaic power station 3 and the service area photovoltaic power station 5 in the power subsystem are the main sources of power for the microgrid system, which can support the charging needs of the vehicle group and provide auxiliary support or full support for the production and living electricity needs in the service area; the distribution network transformer 8 can provide emergency power supply to the microgrid system when the power generation power of new energy is insufficient or the energy storage is insufficient, or replenish the energy storage device 6 according to the energy management requirements;

[0030] The energy storage device 6 in the energy storage subsystem can store photovoltaic power generation energy or grid energy, and assist in supporting the power balance within the microgrid by adjusting the charging and discharging power;

[0031] In the flexible transmission and distribution electronic system, the medium-distance high-voltage power router 1 can convert the renewable energy power outside the service area into direct current, and supply it to any service area on one side or to the double-layer service area at the same time according to the dispatching instructions of the energy management strategy; multiple mutual assistance high-voltage power routers 2 can transmit power between the service areas on both sides, forming a dual-station energy mutual assistance, and at the same time complete the utilization of renewable energy power outside the station. It adopts the form of multi-channel transmission, which can reduce line loss while enhancing power supply reliability; the low-voltage power router 4 can directly manage the photovoltaic power station 5, energy storage equipment 6 and loads such as charging facilities in the service area to achieve local source-storage-load balance. When local power resources are difficult to maintain the balance of power supply and demand, power assistance or energy replenishment can be performed by calling the distribution network, or the new energy power generation resources or energy storage resources can be shared with other low-voltage power routers 4 through the intelligent DC bus 11.

[0032] In some embodiments, the energy storage device comprises an electrochemical battery, a capacitor, or a battery-capacitor composite energy storage device.

[0033] The management system includes: a management module component and a management platform for centrally controlling the management module component, wherein the management module component includes: a first power electronic module with multi-port input and output arranged on a medium-distance high-voltage power router 1, which integrates an AC / DC converter, a DC / DC converter and a photovoltaic PCS (Power Conversion System, the energy storage converter consists of DC / DC buck-boost power conversion, control, protection devices and circuits, monitoring and other equipment and devices, so that the photovoltaic power generation output voltage is stable), a multi-port DC / DC converter module arranged on a Huji high-voltage power router 2, a second power electronic module with multi-port bidirectional conversion arranged on a low-voltage power router 4, which integrates an AC / DC converter, a DC / DC converter and a photovoltaic DC / DC converter with an MPPT (Maximum power point tracking) function, and a voltage adjustment module arranged on an intelligent DC bus.

[0034] The management performed according to the above management system includes, for example: the management platform controls to adjust the on-off duty cycle of the power tube of the AC / DC converter in the first power electronic module and / or the second power electronic module for rectification and transformation, so as to realize the conversion of the AC input of the backup power supply into the DC output entering the microgrid system, and further, for example, converting the 0.4kV AC input into a 700-1000V DC, thereby introducing the power of the backup power supply into the microgrid system and used to supplement the energy storage device and / or support the direct power demand in the microgrid system; the management platform controls to adjust the DC / DC converter in one or more of the first power electronic module, the multi-port DC / DC converter module and the second power electronic module The chopping control duty cycle is used to control the input / output voltage of each power router, so as to adjust the charging and discharging state and charging and discharging power of the energy storage device; the management platform controls and adjusts the on-off duty cycle of the power tube of the photovoltaic DC / DC converter in the second power electronic module to dynamically track the maximum power output state of the photovoltaic output, so that the photovoltaic power generation can output a stable voltage / current, so that the photovoltaic power generation power can directly bear the charging demand of electric vehicles or replenish energy for distributed energy storage equipment; the management platform controls and adjusts the voltage adjustment module of the intelligent DC bus to realize that the voltage of the intelligent DC bus with a reference voltage of 850Vdc is dynamically changed in the range of 700Vdc-1000Vdc according to demand

[0035] In some specific implementations, the implementation of the dynamic change includes:

[0036] Calculate the real-time weighted average power efficiency value of each subsystem in the microgrid system as follows:

[0037] η N =(η1*P1+η2*P2+…η i *P i ) / (P1+P2+…P N ),

[0038] Among them, η i represents the efficiency value of the ith subsystem, P i Represents the real-time power value of the i-th subsystem;

[0039] According to the working efficiency value η of each power-consuming facility and power-generating facility i (i is the number of the facility) change trend, adjust the specific voltage operating value of the DC bus within 700Vdc-1000Vdc, so that the power efficiency value η of the microgrid system N+1 Meet expectations.

[0040] The above management system of the present invention can be divided into a site level and a system level according to the associated scope. The energy management of the two levels is different in terms of control frequency, power control size, etc.

[0041] The management system uses 0.4kV grid transmission lines, intelligent DC busbars, Huji high-voltage DC lines, medium-distance high-voltage DC lines and all equipment connected to the busbars and DC lines as the physical basis for energy regulation, uses the equipment's operating data as the basis for energy regulation, and uses energy self-consistency as the energy regulation target for energy regulation.

[0042] According to the above structure and management system, the microgrid system of the present invention can form a topological structure including a local layer, a station layer, a system layer and a backup layer, wherein:

[0043] The local layer includes the low-voltage power router 4 in any service area on one side, the service area photovoltaic power station 5 connected to and managed by it, the energy storage equipment 6 and the load such as the DC charging pile 7 and the connection lines between them. The local layer is a source-storage-load autonomous community with a certain stability. When the local load demand is too high or the system needs to be supplemented, the external distribution network power is called according to the control command of the energy management strategy of the management platform.

[0044] The station layer includes: the intelligent DC bus 11 that interconnects all local layers on one side and the connection lines between it and the low-voltage power router 4 in the local layer. The station layer can connect the source-storage-load autonomous community of the local layer through the intelligent DC bus 11 to form an interconnected network, realize the sharing and orderly coordination of power generation resources and energy storage resources within the service area on one side, and enhance the capacity of new energy power generation and consumption.

[0045] The system layer includes: a high-voltage power router 2 that connects and supplies power to two opposite station layers, a medium-distance high-voltage power router 1, a slope photovoltaic power station 3, and the connecting lines between them. The system layer can realize mutual power transmission between opposite station layers through high-voltage power routers, and the medium-distance high-voltage power router 1 connects the external new energy generation resources of the station to the service area for utilization.

[0046] There are obvious differences in the peak values, occurrence timing and duration of two-way traffic on highways. Therefore, the two-way service area power resource mutual assistance function at the system level can replenish energy for the station level or local level with insufficient power supply, so that the system can maintain a high self-consistency rate during dynamic operation.

[0047] The backup layer includes: a distribution transformer 8 that introduces backup power into the site layer, a power transmission line 12 and a connection line between it and the low-voltage power router 4. The backup layer can achieve energy balance through the distribution power support system when the energy of other layers is insufficient.

[0048] The present invention further provides a management method for the above microgrid system, which includes: according to the energy supply situation of the highway service area, four management strategies are adopted for management, including a single-station self-circulation strategy, a single-station grid-connected strategy, a mutual aid self-circulation strategy and a mutual aid grid-connected strategy, wherein:

[0049] The single-station self-circulation strategy includes:

[0050] When each local layer in the field station layer on each side can achieve a balance of energy, energy storage and load, that is, realize autonomous operation, the management system controls the microgrid system to use a single local layer as the energy supply unit, without interconnecting the local layers, connecting the field station layers, and connecting with the backup layer;

[0051] The single-station grid connection strategy includes:

[0052] When the local layers in the field station layer on any side cannot fully realize autonomous operation, but can realize self-consistent operation in the field station layer, the management system controls the local layers in the field station layer on that side of the microgrid system to interconnect and / or connect the local layers with the backup energy, and does not connect the field station layers;

[0053] The mutual aid self-circulation strategy includes:

[0054] When the local layer and the station layer on either side cannot achieve self-consistent operation, but can achieve self-consistent operation on the system layer through the energy supply provided by the station layer on the other side, the management system controls the station layers on both sides of the microgrid system to be connected, and the connection between the station layer and the standby layer is not performed;

[0055] The mutual aid grid connection strategy includes:

[0056] When the local layer and the station layer on either side cannot achieve self-consistent operation, and cannot achieve self-consistent operation at the system level through the energy supply provided by the station layer on the other side, the management system controls the station layers on both sides of the microgrid system to be connected and connected to the backup layer.

[0057] The above embodiments are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. Highway service area energy supply microgrid system, which includes: A structural system and a management system for intelligently managing the structural system; wherein the structural system includes: a power supply subsystem for providing power, an energy storage subsystem for storing energy, a flexible transmission and distribution electronic system for regulating power changes and transmitting electric power, and a load; the power supply subsystem includes: new energy power generation equipment arranged outside the service area, namely, slope new energy power generation equipment, multiple new energy power generation equipment distributedly arranged in the service areas on each side, namely, service area new energy power generation equipment, and a distribution transformer that can use the power of the existing public power grid in the highway service area as a backup power supply; the energy storage subsystem includes multiple energy storage equipment distributedly arranged in the service areas on each side; the flexible transmission and distribution electronic system includes: converting the generated current of the slope new energy power generation equipment into a DC form and supplying it to a medium-distance high-voltage power router in the service area on either side or both sides, transmitting power between the service areas on both sides and inside and outside the service areas and electrically connected to the medium-distance high-voltage power router A high-voltage power router, a plurality of low-voltage power routers distributed in the service areas on each side and electrically connected to the new energy power generation equipment in the service area, the energy storage equipment and the mutual aid high-voltage power router, and a power transmission line for connecting the backup power supply to the power grid in the system through the low-voltage power router, wherein a medium-distance high-voltage direct current transmission line, namely a medium-distance high-voltage direct current line, is formed between the slope new energy power generation equipment and the medium-distance high-voltage power router, and a high-voltage direct current transmission route for energy mutual assistance between the medium-distance high-voltage power router and the mutual aid high-voltage power router and between the mutual aid high-voltage power routers is formed, namely, an opposite double-station energy mutual assistance high-voltage direct current line; an interconnected direct current transmission route within a single-side service area is formed between the mutual aid high-voltage power router and the low-voltage power router and between the low-voltage power routers; and the load is electrically connected to the low-voltage power router.

2. The microgrid system according to claim 1, characterized in that: The new energy power generation equipment includes a photovoltaic power station, and the load includes a DC charging pile.

3. The microgrid system according to claim 1, characterized in that: The energy storage device comprises an electrochemical battery, a capacitor or a battery-capacitor composite energy storage device.

4. The microgrid system according to claim 1, characterized in that: It forms a topological structure including a local layer, a station layer, a system layer and a backup layer, wherein the local layer includes: the low-voltage power router in any service area on a single side, the service area new energy power generation equipment connected to and managed by it, the energy storage equipment and the load and the connection lines between them; the station layer includes: the intelligent DC bus that interconnects all the local layers on a single side and the connection lines between it and the low-voltage power router in the local layer; the system layer includes: the high-voltage power router that connects and supplies power to two opposite station layers, the medium-distance high-voltage power router, the slope new energy power generation equipment and the connection lines between them; the backup layer includes: the distribution transformer that introduces the backup power supply into the station layer, the power grid transmission line and the connection lines between it and the low-voltage power router.

5. The microgrid system according to claim 1, characterized in that: The management system includes: a management module component and a management platform for centrally controlling the management module component, wherein the management module component includes: a first power electronic module with multi-port input and output arranged on the medium-distance high-voltage power router and integrating an AC / DC converter, a DC / DC converter and a photovoltaic PCS, a multi-port DC / DC converter module arranged on the Huji high-voltage power router, a second power electronic module with multi-port bidirectional conversion arranged on the low-voltage power router and integrating an AC / DC converter, a DC / DC converter and a photovoltaic DC / DC converter with an MPPT function, and a voltage adjustment module arranged on the intelligent DC bus.

6. The microgrid system management method according to claim 5, characterized in that: The management platform uses the power grid transmission lines, intelligent DC busbars, Huji high-voltage DC lines, medium-distance high-voltage DC lines and all equipment connected to these lines as the physical basis for energy regulation, uses the operating data of all equipment as the basis for energy regulation, and uses energy self-consistency as the energy regulation target for energy regulation.

7. The microgrid system management method according to claim 5, characterized in that: The management platform controls to adjust the on-off duty cycle of the power tube of the AC / DC converter in the first power electronic module and / or the second power electronic module for rectification conversion, so as to convert the AC input of the backup power supply into a DC output entering the microgrid system; the management platform controls to adjust the chopping control duty cycle of the DC / DC converter in one or more of the first power electronic module, the multi-port DC / DC converter module and the second power electronic module, so as to control the input and output voltages of each power router; The management platform controls and adjusts the on-off duty cycle of the power tube of the photovoltaic DC / DC converter in the second power electronic module to dynamically track the maximum power output state of the photovoltaic output; the management platform controls and adjusts the voltage adjustment module to achieve dynamic change of the voltage of the intelligent DC bus in the range of 700Vdc-1000Vdc according to demand.

8. The management method according to claim 7, characterized in that: The dynamic changes include: Calculate the real-time weighted average power efficiency value of each subsystem in the microgrid system as follows: or N =(η1*P1+η2*P2+…η i *P i ) / (P1+P2+…P N ), Among them, η i represents the efficiency value of the ith subsystem, P i Represents the real-time power value of the i-th subsystem; According to η i According to the changing trend of the DC bus, the specific voltage operating value of the DC bus is adjusted within 700Vdc-1000Vdc, so that the power efficiency value η of the microgrid system N+1 Meet expectations.

9. The microgrid system management method according to claim 4 or 5, characterized in that: According to the energy supply situation of the highway service area, four management strategies are adopted to manage the microgrid system, including single-station self-circulation strategy, single-station grid-connected strategy, mutual assistance self-circulation strategy and mutual assistance grid-connected strategy. Among them, the single-station self-circulation strategy includes: when each local layer in the station layer on each side can achieve a balance of energy, energy storage and load, that is, realize autonomous operation, the management system controls the microgrid system to use a single local layer as an energy supply unit, and does not interconnect the local layers and connect the station layers on both sides and the standby layer; the single-station grid-connected strategy includes: when the local layer in the station layer on any side cannot fully realize autonomous operation, but it can realize self-consistent operation in the station layer on that side, the management system controls the station layer on that side of the microgrid system The local layers are interconnected and / or the local layer is connected with the backup layer, and the field layers on both sides are not connected; the mutual aid self-circulation strategy includes: when the local layer and the field layer in either side of the field layer cannot achieve self-consistent operation, but can achieve self-consistent operation on the system layer through the energy supply provided by the field layer on the other side, the management system controls the field layers on both sides of the microgrid system to be connected, and does not connect the field layer with the backup layer; the mutual aid grid-connected strategy includes: when the local layer and the field layer in either side of the field layer cannot achieve self-consistent operation, and cannot achieve self-consistent operation on the system layer through the energy supply provided by the field layer on the other side, the management system controls the field layers on both sides of the microgrid system to be connected, and connected with the backup layer.

Images