Micro-grid intelligent power distribution cabinet for light-storage direct-flexible building

Abstract

The utility model provides a micro-grid intelligent power distribution cabinet for a light-storage direct-flexible building, which comprises a micro-grid intelligent controller, wherein the micro-grid intelligent controller acquires full-electric-quantity data such as commercial power, a photovoltaic power supply, a load and current and voltage of an energy storage unit in a micro-grid system and the discharge depth of the energy storage unit in real time by utilizing a wired electric control system; the AC-DC bidirectional converter is intelligently controlled through data analysis and operation so as to manage the current flow directions of the commercial power and the photovoltaic power supply and control the charging and discharging state and power of the energy storage unit. And the micro-grid intelligent controller performs real-time data interaction with the grid-connected point anti-countercurrent intelligent electric meter to prevent the micro-grid intelligent power distribution cabinet from supplying power to the power grid. The micro-grid intelligent power distribution cabinet can be used as a guarantee power supply of important alternating current and direct current loads by utilizing a rapid grid-connected and off-grid switching technology and the capacity of an energy storage unit; a building micro-grid system comprising a'source grid load storage 'behind a grid-connected and off-grid switch is the most friendly'adjustable load' of a virtual power plant, and has great significance in energy conservation and carbon reduction of a building.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic distribution cabinets, and more specifically, to a photovoltaic storage direct flexible building micro-grid intelligent distribution cabinet. Background Art

[0002] The inverter is then connected to the incoming line of the circuit breaker through a cable, and then the outgoing line of the circuit breaker is connected to the busbar, the busbar is connected to the frame circuit breaker, the frame circuit breaker is connected to the low-voltage side of the transformer, and the high-voltage side of the transformer is connected to the power grid. The circuit breakers are all placed in the photovoltaic distribution cabinet. The existing photovoltaic distribution cabinet has the problem of single function and low power supply efficiency.

[0003] At present, the common optical, storage and direct current systems on the market are mostly the following three types:

[0004] 1. Photovoltaic power generation is connected to the grid and uses photovoltaic power generation + inverter to achieve energy conversion from solar power generation to AC power and realize electricity bill benefits.

[0005] 2. Common industrial and commercial energy storage uses peak and valley electricity prices for price arbitrage. Energy storage equipment is charged during low electricity consumption periods and discharged during peak electricity consumption periods, reducing the electricity load during peak periods and achieving peak shifting and valley filling.

[0006] 3. Photovoltaic power generation + energy storage system, to achieve photovoltaic power generation and multi-power microgrid system. When the photovoltaic power is sufficient, it is used to charge the energy storage unit. If there is surplus power, it is converted to AC through PCS for AC load use; when the photovoltaic power / battery is insufficient, it is powered by the grid.

[0007] However, this solution has certain problems. It cannot ensure that the surplus power is only used to supply AC power at this level, and there is a situation where it can supply power to other AC equipment under the same transformer. Summary of the invention

[0008] The purpose of the utility model is to provide a photovoltaic storage direct flexible building microgrid intelligent distribution cabinet to solve the problems of single function and low power supply efficiency of photovoltaic distribution cabinets proposed in the above background technology.

[0009] To achieve the above object, the present utility model provides the following technical solutions: a photovoltaic module interface that inputs direct current and stabilizes it to DC1; an energy storage unit connected to the output end of the photovoltaic module interface; a DC / DC converter whose input end is connected to the output end of the photovoltaic module interface, and whose output end outputs DC2 direct current for use by a DC load; a microgrid intelligent controller that utilizes a telecommunications control system to achieve real-time control of the microgrid system, connects to an intelligent electricity meter to collect real-time data such as current, voltage, and power in the power grid, processes the data through the microgrid intelligent controller, provides accurate data support for adjusting the photovoltaic module interface and the energy storage unit, and configures an important AC load output interface;

[0010] An AC / DC bidirectional converter whose input end is connected to the output end of the photovoltaic module interface, and whose output end is controlled by the microgrid intelligent controller to achieve the power flow to the energy storage unit, or the DC / DC converter, or the AC load.

[0011] Preferably, multiple strings of photovoltaic DC cables are led to a nearby independent external MPPT module with photovoltaic power optimization function, and are integrated into a group of DC cables through the module and connected to the photovoltaic module interface of the intelligent power distribution cabinet of the optical storage direct current and flexible building microgrid.

[0012] Preferably, the photovoltaic module interface module performs voltage regulation on the input power supply to reach the same DC power supply voltage range as the DC charging pile and the energy storage module. The outgoing line of the photovoltaic interface module and the incoming lines of the DC charging pile, the DC buck module, and the energy storage module are coupled at the DC high-voltage bus section here.

[0013] Preferably, the microgrid intelligent controller utilizes a telecommunications control system to collect real-time full-electricity data of current and voltage of the mains power, photovoltaic power supply, various loads, and energy storage unit in the microgrid system, as well as the depth of discharge of the energy storage unit. Combining with the set operation strategy for the microgrid, through data analysis and calculation, it intelligently controls the AC / DC bidirectional converter to manage the current flow of the mains power and photovoltaic power supply, and intelligently controls the charging and discharging state and power of the energy storage unit.

[0014] Preferably, the microgrid intelligent controller conducts real-time data interaction with the anti-counterflow intelligent electricity meter at the grid connection point to prevent the intelligent power distribution cabinet of the optical storage direct current and flexible building microgrid from sending power to the grid side.

[0015] Preferably, the intelligent microgrid power distribution cabinet is configured with important AC / DC emergency power supply interfaces, and by using fast grid connection and disconnection switching technology and the capacity of the energy storage unit, it can be used as an emergency power supply for important AC / DC loads

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: The intelligent power distribution cabinet for the photovoltaic-storage-direct-current-flexible building microgrid:

[0017] Aggregates different types of energy. The intelligent power distribution cabinet for the photovoltaic-storage-direct-current-flexible building microgrid preferentially supplies power to high-efficiency DC lighting. When there is surplus power, it supplies power to other AC loads during peak hours and can be used as a backup power source. The system based on this power distribution cabinet does not feed power back to the public grid, realizing the "self-generation and self-use, direct generation and direct use" of photovoltaic power generation.

[0018] This power distribution cabinet can reduce the inversion link of photovoltaic power generation, improve the utilization efficiency of green electricity, so as to obtain higher benefits; for the power grid, it is a "controllable flexible load" used for peak shaving, valley filling, and shifting peak and filling valley, with high social green value and is suitable for use in cities with rich sunlight resources.

[0019] In the power distribution cabinet provided by the present utility model, the AC power grid, photovoltaic energy access, and energy storage are configured to ensure power supply reliability; the DC consumption of new energy power generation reduces the energy conversion levels and line losses, realizing efficient consumption; the system senses the AC voltage to realize the use of the backup power source for important AC loads during off-grid operation; the system can be regarded as a "controllable flexible load" of the power grid for overall scheduling.

[0020] The intelligent microgrid power distribution cabinet, which is the core equipment adopting the high-efficiency "photovoltaic-storage-direct-current-flexible" integrated technical solution, constructs the building power consumption system into a new type of green building power system with coordinated operation of source (photovoltaic power generation) - network (380VAC and 220VDC dual internal networks) - load (DC lighting and some AC electrical equipment) - storage (electrochemical energy storage), forming an "intelligent microgrid". As a whole, it can be used as a "controllable flexible load" of the superior power grid, with the functions of peak shaving, valley filling, and shifting peak and filling valley. When the superior power grid has peak shaving requirements and does not supply power to the "intelligent microgrid", the intelligent microgrid power distribution cabinet can automatically supply power to important AC loads and DC loads using the capacity of the energy storage unit, and users will not perceive the change in the power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Is a typical schematic diagram of industrial and commercial photovoltaics in the background technology;

[0022] Figure 2 Is a typical schematic diagram of industrial and commercial photovoltaics in the background technology;

[0023] Figure 3 Is a typical schematic diagram of industrial and commercial photovoltaics in the background technology;

[0024] Figure 4 Is a schematic diagram of an intelligent power distribution cabinet for a photovoltaic-storage-direct-current-flexible building microgrid provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figure 4 , the present utility model provides a technical solution: an intelligent power distribution cabinet for a photovoltaic-storage-direct-soft building microgrid, comprising: a photovoltaic module interface that inputs direct current and stabilizes its voltage to DC1; a energy storage unit connected to the output end of the photovoltaic module interface; a DC / DC, the input end of which is connected to the output end of the photovoltaic module interface, and the output end of which outputs DC2 direct current for use by direct current loads; a microgrid intelligent controller that uses a telecontrol system to achieve real-time control of the microgrid system, connects to an intelligent electricity meter to collect index data such as current, voltage, and power in the power grid in real time, and processes the data through the microgrid intelligent controller to provide accurate data support for adjusting the photovoltaic module interface and the energy storage unit, and configures important alternating current load output interfaces.

[0027] An AC-DC bidirectional converter, the input end of which is connected to the output end of the photovoltaic module interface, and the output end of which is controlled by the microgrid intelligent controller to realize the power flow direction to the energy storage unit, or the DC / DC, or the alternating current load.

[0028] Lead multiple strings of photovoltaic DC cables to a nearby independent external MPPT module with photovoltaic power optimization function, and after being aggregated by the module, connect a group of DC cables to the photovoltaic module interface of the intelligent power distribution cabinet for the photovoltaic-storage-direct-soft building microgrid;

[0029] The photovoltaic module interface module performs voltage regulation on the input power supply to reach the same DC power supply voltage range as the DC charging pile and the energy storage module. The outgoing line of the photovoltaic interface module and the incoming lines of the DC charging pile, the DC step-down module, and the energy storage module are coupled at the DC high-voltage bus section here to realize the efficient and economic system innovation of "direct power generation and direct use" of photovoltaic power generation and the shared bidirectional PCS inversion function.

[0030] The microgrid intelligent controller uses the electric control system to collect the full power data such as current and voltage of the mains, photovoltaic power supply, various loads, and energy storage units in the microgrid system in real time, as well as the discharge depth of the energy storage units. Combined with the operation strategy set for the microgrid, through data analysis and calculation, it intelligently controls the AC / DC bidirectional converter to manage the current flow of the mains and photovoltaic power supplies, and intelligently controls the charging and discharging status and power of the energy storage unit.

[0031] The microgrid intelligent controller interacts with the anti-backflow smart meter at the grid connection point in real time to prevent the smart distribution cabinet of the photovoltaic storage direct flexible building microgrid from supplying power to the grid side.

[0032] The smart microgrid distribution cabinet is equipped with important AC / DC power supply interfaces. It uses fast on-grid and off-grid switching technology and energy storage unit capacity to serve as a power supply for important AC / DC loads. The microgrid smart controller uses power cables inside and outside the cabinet to achieve real-time interaction of their operating status and data with each module and instrument, as well as the issuance of control commands. The on-grid and off-grid switching device is used to achieve fast on-grid and off-grid switching, thereby ensuring near-continuous power supply for the loads.

[0033] The intelligent distribution cabinet for photovoltaic storage and direct-flexible building microgrid gives priority to supplying power to high-efficiency DC lighting, and supplies power to other AC loads during peak hours if there is surplus electricity, and can be used as a backup power supply. The system based on this distribution cabinet does not supply power to the public power grid, realizing the "self-generation and self-use, direct generation and direct use" of photovoltaic power generation. This distribution cabinet can reduce the inverter link of photovoltaic power generation and improve the efficiency of green electricity use in order to obtain higher returns; it is a "controllable flexible load" for the power grid, which is used to reduce peaks and fill valleys and shift peaks and fill valleys. It has high social green value and is suitable for use in cities with abundant light resources. In the distribution cabinet provided by the utility model, the AC power grid and photovoltaic energy access are equipped with energy storage to provide guarantee for power supply reliability; the DC consumption of new energy power generation reduces the energy conversion level, reduces line losses, and realizes efficient consumption; the system senses the AC voltage to realize the use of off-grid backup power for important AC loads; the system can be regarded as a "controllable flexible load" of the power grid for scheduling.

[0034] The photovoltaic storage direct flexible building microgrid intelligent distribution cabinet can reduce the inverter link of photovoltaic power generation and improve the efficiency of green electricity use in order to obtain higher returns; it is a "controllable flexible load" for the power grid, used to reduce peaks and fill valleys, and has high social green value; it is suitable for use in cities with abundant light resources. The photovoltaic storage direct flexible building microgrid intelligent distribution cabinet adopts a non-breakpoint AC power switching device, which links the intelligent microgrid to provide power guarantee for important AC loads.

[0035] The photovoltaic power generation unit is at least a 585N high-efficiency single-crystalline silicon single-sided half-cell solar module, and the optimal operating voltage can reach 42.52V. Taking 17 photovoltaic modules as a group, the voltage of a group can reach DC722.84V.

[0036] Energy storage unit: At least choose lithium iron phosphate batteries, with a total capacity of at least 233kwh and at least 100kw of input and output capabilities.

[0037] One of the charge and discharge strategies can be:

[0038] From 0 to 8 o'clock (valley period), the commercial power charges the intelligent power distribution cabinet of the photovoltaic-storage-direct-soft building microgrid, and the commercial power supplies power to AC equipment.

[0039] From 8 to 10 o'clock (flat period), the commercial power supplies power to AC equipment. When there is sufficient sunlight charging, the photovoltaic power generation gives priority to DC lighting, and when there is surplus, it charges the energy storage unit. The energy storage unit does not discharge during this period.

[0040] From 10 to 12 o'clock (peak period), give priority to using the energy storage unit and photovoltaic power to supply power to AC equipment and DC equipment; if the supply of the energy storage unit and photovoltaic power is insufficient, the commercial power is supplemented. For photovoltaic power generation, it gives priority to DC lighting, and when there is surplus, it charges the energy storage unit. The energy storage unit mainly discharges during this period.

[0041] From 12 to 14 o'clock (flat period), give priority to charging the energy storage unit with photovoltaic power, and then use photovoltaic power to supply power to AC and DC equipment. The energy storage unit is charged during this period.

[0042] From 14 to 19 o'clock (peak period), give priority to using the energy storage unit and photovoltaic power to supply power to AC and DC equipment; if the supply of the energy storage unit and photovoltaic power is insufficient, the commercial power is supplemented. For photovoltaic power generation, it gives priority to DC lighting, and when there is surplus, it charges the energy storage unit. The energy storage unit mainly discharges during this period.

[0043] From 19 to 24 o'clock (flat period), the commercial power supplies power to AC and DC equipment. If the energy storage unit has surplus power during this period, it is discharged.

[0044] The above embodiments are only used to explain the technical solutions of the present invention rather than limit them. Those skilled in the art should understand that any modification and equivalent replacement without departing from the spirit and scope of the present invention should fall within the protection scope of the claims of the present invention.

Claims

1. An intelligent power distribution cabinet for a photovoltaic-storage-direct-current flexible building microgrid, characterized in that Including: A photovoltaic module interface that inputs direct current and stabilizes it to DC1; An energy storage unit connected to the output end of the photovoltaic module interface; A DC / DC converter, whose input end is connected to the output end of the photovoltaic module interface, and whose output end outputs DC2 direct current for use by DC loads; A microgrid intelligent controller that utilizes a telecommunications control system to achieve real-time control of the microgrid system. By connecting to an intelligent electricity meter, it can collect real-time indicator data such as current, voltage, and power in the power grid, and process it through the microgrid intelligent controller to provide accurate data support for adjusting the photovoltaic module interface and the energy storage unit, and configure an important AC load output interface; An AC / DC bidirectional converter, whose input end is connected to the output end of the photovoltaic module interface, and whose output end is controlled by the microgrid intelligent controller to achieve the power flow to the energy storage unit, or the DC / DC converter, or the AC load.

2. The intelligent power distribution cabinet of the photovoltaic-storage-direct-current-soft building microgrid according to claim 1, characterized in that: Lead multiple strings of photovoltaic DC cables to a nearby independent external MPPT module with photovoltaic power optimization function, and integrate them into a group of DC cables through the module and connect them to the photovoltaic module interface of the intelligent power distribution cabinet of the photovoltaic-storage-direct-current-flexible building microgrid.

3. The intelligent power distribution cabinet of the photovoltaic-storage-direct-current flexible building microgrid according to claim 2, characterized in that: The photovoltaic module interface module performs voltage regulation on the input power supply to reach the same DC power supply voltage range as the DC charging pile and the energy storage module. The outgoing line of the photovoltaic interface module is coupled with the incoming lines of the DC charging pile, the DC buck module, and the energy storage module at the DC high-voltage bus section here.

4. The intelligent power distribution cabinet for a photovoltaic-storage-direct-current flexible building microgrid according to claim 1, wherein: The microgrid intelligent controller utilizes a telecommunications control system to collect real-time full-electricity data of current and voltage of the mains power, photovoltaic power supply, various loads, and energy storage unit in the microgrid system, as well as the depth of discharge of the energy storage unit. Combining with the set operation strategy for the microgrid, through data analysis and calculation, it can intelligently control the AC / DC bidirectional converter to manage the current flow of the mains power and photovoltaic power supply, and intelligently control the charging and discharging state and power of the energy storage unit.

5. The intelligent power distribution cabinet for a photovoltaic-storage-direct-current flexible building microgrid according to claim 4, characterized in that: The microgrid intelligent controller conducts real-time data interaction with the anti-counterflow intelligent electricity meter at the grid connection point to prevent the intelligent power distribution cabinet of the photovoltaic-storage-direct-current-flexible building microgrid from sending power to the grid side.

6. The intelligent power distribution cabinet of the photovoltaic-storage-direct-current-soft building microgrid according to claim 5, wherein: The intelligent microgrid power distribution cabinet is configured with important AC / DC emergency power supply interfaces, and by using fast on-grid / off-grid switching technology and the capacity of the energy storage unit, it can be used as an emergency power supply for important AC / DC loads.

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