Optical storage direct flexible system

Abstract

The invention, which belongs to the technical field of the optical storage direct-current flexible technology and the power supply system, provides an optical storage direct-current flexible system comprising a control center, a centralized energy storage device and a plurality of user units. The centralized energy storage device is connected with the power grid and the centralized energy storage device through the control center, an inverter is arranged between the power grid and the control center, and the centralized energy storage device comprises a plurality of energy storage units; the user unit comprises an indoor main line, the indoor main line is connected with a power grid through the control center, the user unit further comprises an independent energy storage device and a plurality of loads, the independent energy storage device and the loads are connected with the indoor main line, and the loads comprise air conditioners, lamps, refrigerators and charging piles; and the independent energy storage device is connected with photovoltaic equipment and is connected with the centralized energy storage device. According to the scheme, power supply ways of the user units can be effectively increased, energy consumption is reduced, and dependence of the user units on power utilization of a power grid is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic storage direct-flexible technology and power supply system, and in particular relates to a photovoltaic storage direct-flexible system. Background Art

[0002] "PV-Storage-Direct-Flexible" is a new building energy system that is equipped with building photovoltaics and building energy storage, adopts a DC distribution system, and has electrical equipment with active power response function. It is also the best zero-carbon building solution to solve the problem of future power supply mainly powered by renewable energy and to achieve effective matching of photovoltaics and buildings.

[0003] The traditional mode of combining photovoltaics with buildings is to build a photovoltaic power station, convert the direct current generated by photovoltaics into alternating current through an inverter, and integrate it into the existing AC power grid, that is, centralized power generation first, and rural users then draw electricity from the Internet. In this system mode, users are still highly dependent on the power supply of the power grid. When the power grid fails or is under maintenance, normal power supply cannot be guaranteed, and a large amount of power is lost during the transmission process. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a solar-storage direct-flexible system, which can effectively increase the power supply path of user units, reduce energy consumption, and reduce the dependence of user units on power grid electricity.

[0005] In order to achieve the purpose of the present invention, the following scheme is proposed: A solar-storage direct-flexible system includes: a control center, a centralized energy storage device and a number of user units; The centralized energy storage device is connected to the power grid and the centralized energy storage device through the control center. An inverter is provided between the power grid and the control center. The centralized energy storage device includes a plurality of energy storage units. The user unit includes an indoor main line, which is connected to the power grid through a control center. The user unit also includes an independent energy storage device connected to the indoor main line and a number of loads, wherein the loads include air conditioners, lamps, refrigerators and charging piles; The independent energy storage device is connected to the photovoltaic device and is also connected to the centralized energy storage device.

[0006] The beneficial effects of the present invention are as follows: the present solution realizes power capacity expansion through a centralized energy storage device and an independent energy storage device provided in each user unit, reduces the conversion and transmission process of current between the centralized energy storage device and the power grid, reduces power loss, and provides more ways for each user unit to supply power, further reducing the dependence of the user unit on the power grid, while also avoiding the waste of excess power generated by the photovoltaic equipment of each user unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0008] Figure 1 A schematic diagram of the framework of the solar-storage direct-flexible system of the present application is shown.

[0009] Figure 2 A schematic diagram of the external structure of the centralized energy storage device of the present application is shown.

[0010] Figure 3 A cross-sectional view of the energy storage unit and the independent energy storage device of the present application is shown.

[0011] Figure 4 The schematic diagram of the structure of the energy storage unit, the independent energy storage device and the connecting seat is shown.

[0012] Markings in the figure: connecting base -1, mounting plate -11, conductive ring -12, insulating tube -13, spring -14, electrode -21, insulating terminal -22, countersunk hole -221. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0014] Embodiment 1, as Figure 1 As shown, a solar-storage direct-flexible system includes: a control center, a centralized energy storage device and a plurality of user units.

[0015] The centralized energy storage device is connected to the power grid and the centralized energy storage device through the control center. An inverter is provided between the power grid and the control center. Specifically, the inverter is an AC380V to DC256V inverter with a rated power of 25kW. The centralized energy storage device includes several energy storage units with an energy storage capacity of more than 300kW.

[0016] The user unit includes an indoor main line, which is connected to the power grid through a control center. The user unit also includes an independent energy storage device connected to the indoor main line and a number of loads, wherein the loads include but are not limited to air conditioners, lamps, refrigerators and charging piles.

[0017] The independent energy storage device is connected to the photovoltaic device and is also connected to the centralized energy storage device.

[0018] The above-mentioned PV-storage direct-flexible system solution can provide the following multiple usage conditions: Working condition 1: The electric energy generated by the photovoltaic equipment is preferentially stored in an independent energy storage device, and the load is supplied with power through the independent energy storage device, which is used to reduce the amount of electricity used by the user unit through the power grid and reduce the consumption of upstream energy; Working condition 2: When the power of the independent energy storage device is greater than the preset value, the independent energy storage device supplies power to the centralized energy storage device, and the centralized energy storage device is used to store the excess power of each user unit. In this way, there is no need to set up a dedicated photovoltaic for the centralized energy storage device, which reduces the cost of the system. In addition, the power of the centralized energy storage device can be used to supply power to public facilities in the residential area, achieving the purpose of taking from the people and using it for the people, and reducing the collective expenses of the residential area as a whole; Working condition three: The power of both the independent energy storage device and the centralized energy storage device is greater than the preset value. The excess power of the independent energy storage device is converted from DC to AC through the inverter and then connected to the grid. Specifically, the independent energy storage device can directly connect the current to the grid through the indoor main line connected to the control center, or collect the current through the centralized energy storage device and then connect it to the grid as a whole. Moreover, with this scheme design, even if some of the photovoltaic equipment is damaged, it will not have a significant impact on the energy storage of the centralized energy storage device, so as to ensure the long-term stable operation of the centralized energy storage device. Working condition 4: Affected by sunlight and the orientation of the photovoltaic equipment, the power generation of the photovoltaic equipment of each user unit is not balanced. When the power of the independent energy storage device in some user units is insufficient, the centralized energy storage device can be used to supply power to the load through the indoor main line or to charge the independent energy storage device, and then use the independent energy storage device to supply power to the load, or use the power grid; the control center can use the centralized energy storage device to supply power to the user unit through data monitoring, and when the power of the centralized energy storage center is lower than the set value, the power grid is used for power supply; Working condition 5: During power grid failure or maintenance, each user unit shall give priority to using its own independent energy storage device for power supply. When the power of the independent energy storage device is lower than the set value, the power shall be supplied by the centralized energy storage device. In this working condition, the centralized energy storage device not only plays an emergency role, but also can be aggregated and allocated according to the power of each independent energy storage device. For example, the power of the independent energy storage device installed in some user units with less power consumption is transmitted to the centralized energy storage device, and then the centralized energy storage device is used to allocate the power to the user units with more power consumption. Working condition 6: When the power of the centralized energy storage device and the independent energy storage device is insufficient, it is supplemented during the low power consumption period at night. This working condition is mostly used in the case of insufficient sunlight during the day. The centralized energy storage device and the independent energy storage device are supplemented with power by the power grid during the low power consumption period to reduce the use cost; In the above working conditions, the power data of the independent energy storage device and the centralized energy storage device are actually transmitted to the control center. Signal transmission and control lines are set between the control center and the centralized energy storage device and the user unit. Figure 1As shown by the middle dotted line, the control center switches the working conditions according to the power of the independent energy storage device and the centralized energy storage device. This solution achieves power expansion through the centralized energy storage device and the independent energy storage device installed in each user unit, reduces the conversion and transmission process of current between the centralized energy storage device and the power grid, reduces power loss, and provides more power supply methods for each user unit, further reducing the user unit's dependence on the power grid, while also avoiding the waste of excess power generated by the photovoltaic equipment of each user unit.

[0019] Preferably, Figure 1 As shown, the photovoltaic equipment is connected to the indoor main line. This solution can use the photovoltaic equipment to directly supply power to the load, or after the power stored in the independent energy storage device reaches the set value, the current of the photovoltaic equipment can be directly provided to the centralized energy storage device to increase the practicality of the system.

[0020] Embodiment 2, based on the solution of embodiment 1, the energy storage unit and the independent energy storage device have the same structure, and the two have interchangeable and disassembly functions, and the energy storage unit and the independent energy storage device can be understood as capacitors. Figure 3 , Figure 4 As shown, the centralized energy storage device and the user unit are both provided with a connection socket 1, which is used to connect the energy storage unit and the independent energy storage device respectively. The centralized energy storage device is provided with multiple connection sockets 1, and the user unit is provided with at least one connection socket 1.

[0021] The energy storage unit and the independent energy storage device are both provided with at least two parallel electrodes 21. The electrode 21 is a conical structure with the top of the cone facing outwards.

[0022] The connection base 1 includes a mounting plate 11 and a conductive ring 12 for penetrating the electrode 21 . The inner hole of the conductive ring 12 matches the conical surface outside the electrode 21 .

[0023] During assembly, it is only necessary to align the electrode 21 of the energy storage unit and the independent energy storage device with the conductive ring 12, and insert the electrode 21 into the conductive ring 12 to achieve a quick connection, and the conductive ring 12 transmits current through the cable; when disassembling the energy storage unit and the independent energy storage device, it is only necessary to pull them outwards. The conical structure of the electrode 21 and the matching conductive ring 12 can not only realize the quick disassembly and assembly of the energy storage unit and the independent energy storage device, but also increase the conductive area between the electrode 21 and the conductive ring 12 and the connection stability.

[0024] In the specific scheme, it can be understood that: the centralized energy storage device is composed of multiple independent energy storage devices. In special circumstances, when the independent energy storage device of the user unit is damaged and cannot store energy, the energy storage unit in the centralized energy storage device can be temporarily used as the independent energy storage device of the user unit to avoid the damage of the independent energy storage device affecting power consumption and energy storage. Although the user unit can also be powered by the centralized energy storage device or the power grid, the use of independent energy storage devices to store and supply energy reduces the transmission of current and reduces power loss. After the energy storage unit in the centralized energy storage device is disassembled, the staff can replenish it or the user can send the damaged independent energy storage device for repair and replace it after inspection. This setting makes the photovoltaic storage direct and flexible system of this scheme more flexible and the usage scenarios are richer, which helps to improve the stability of the photovoltaic storage direct and flexible system and reduce the dependence of each user unit on power supply from the power grid.

[0025] Preferably, Figure 3 , Figure 4 As shown, the energy storage unit and the independent energy storage device are both provided with an insulating terminal 22, and the corresponding electrodes 21 are both provided with a countersunk hole 221, and the electrode 21 is coaxially arranged in the corresponding countersunk hole 221, and the inner diameter of the countersunk hole 221 is larger than the outer diameter of the conductive ring 12. After the energy storage unit and the independent energy storage device are assembled with the connecting seat 1, the conductive ring 12 is located in the countersunk hole 221, thereby providing insulation protection for the electrode 21 and the conductive ring 12, thereby improving the user's safety.

[0026] Preferably, Figure 3 , Figure 4 As shown, an insulating tube 13 is coaxially provided on the outside of the mounting plate 11 corresponding to the conductive ring 12, and the bottom of the insulating tube 13 is vertically connected to the mounting plate 11. After the energy storage unit and the independent energy storage device are assembled with the connecting seat 1, the insulating tube 13 is passed through the corresponding countersunk hole 221. This structure can not only improve the insulation effect, but also increase the connection stability between the energy storage unit and the independent energy storage device and the connecting seat 1 by utilizing the connection between the insulating tube 13 and the countersunk hole 221, thereby preventing the relative displacement between the electrical connecting seat 1 and the energy storage unit and the independent energy storage device along the radial direction of the electrode 21, which may cause damage to the electrode 21.

[0027] Preferably, Figure 3As shown, the mounting plate 11 is made of insulating material, and a spring 14 is provided between the bottom of the conductive ring 12 and the mounting plate 11. When the electrode 21 is connected to the conductive ring 12, the spring 14 is in a compressed state. This structural design mainly uses the spring 14 to press the conductive ring 12 against the electrode 21, and always provides a pressing force for the conductive ring 12, so that the conductive ring 12 and the electrode 21 are always kept in a tightly connected state; on the other hand, after the spring 14 is provided, during the process of inserting the electrode 21 into the conductive ring 12, the spring 14 is used to buffer the conductive ring 12 after the force is applied, so as to prevent the conductive ring 12 and the electrode 21 from being damaged due to impact, and to prevent the energy storage unit and the independent energy storage device from being damaged after the electrode 21 is axially compressed.

[0028] Preferably, Figure 2 As shown, the centralized energy storage device is a cabinet structure, and its array is provided with a plurality of installation cabins for placing energy storage units. A connecting seat 1 is provided at the bottom of each installation cabin, and a door panel is provided at the open end of each installation cabin. A spring sheet is provided inside the door panel for pressing the energy storage unit against the connecting seat 1. Specifically, the centralized energy storage device has a locking function for locking the door panel from the inside. The operator can authenticate the identity through fingerprint control, face recognition or scanning to open the door panel.

[0029] Preferably, Figure 3 As shown, the connecting socket 1 provided in the user unit has its conductive ring 12 facing upwards, and when assembling the independent energy storage device, the electrode 21 faces downwards, so that the electrode 21 and the conductive ring 12 can be pressed tightly by the weight of the independent energy storage device itself, making the installation of the independent energy storage device more convenient and quick.

[0030] The above description is only a preferred embodiment of the present invention, and is not intended to be the only one or to limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A solar storage direct-flexible system, characterized in that: include: Control center, centralized energy storage device and several user units; The centralized energy storage device is connected to the power grid and the centralized energy storage device through the control center. An inverter is provided between the power grid and the control center. The centralized energy storage device includes a plurality of energy storage units. The user unit includes an indoor main line, which is connected to the power grid through a control center. The user unit also includes an independent energy storage device connected to the indoor main line and a number of loads, wherein the loads include air conditioners, lamps, refrigerators and charging piles; The independent energy storage device is connected to the photovoltaic device and is also connected to the centralized energy storage device.

2. The solar-storage direct-flexible system according to claim 1, characterized in that: The photovoltaic equipment is connected to the indoor main line.

3. The solar-storage direct-flexible system according to claim 1, characterized in that: The energy storage unit has the same structure as the independent energy storage device, and the two have interchangeable and disassembly functions.

4. The solar-storage direct-flexible system according to claim 3, characterized in that: The centralized energy storage device and the user unit are both provided with a connection seat (1), which is used to connect the energy storage unit and the independent energy storage device respectively. The centralized energy storage device is provided with a plurality of connection seats (1), and the user unit is provided with at least one connection seat (1); The energy storage unit and the independent energy storage device are both provided with at least two electrodes (21) arranged in parallel, and the electrode (21) is a conical structure with the top of the cone facing outwards; The connecting seat (1) comprises a mounting plate (11) and a conductive ring (12) for penetrating an electrode (21); an inner hole of the conductive ring (12) matches a conical surface outside the electrode (21).

5. The solar-storage direct-flexible system according to claim 4, characterized in that: The energy storage unit and the independent energy storage device are both provided with an insulating terminal (22), and the corresponding electrodes (21) are both provided with a countersunk hole (221). The electrode (21) is coaxially arranged in the corresponding countersunk hole (221), and the inner diameter of the countersunk hole (221) is larger than the outer diameter of the conductive ring (12). After the energy storage unit and the independent energy storage device are assembled with the connecting seat (1), the conductive ring (12) is located in the countersunk hole (221).

6. The solar-storage direct-flexible system according to claim 5, characterized in that: An insulating tube (13) is coaxially arranged outside the mounting plate (11) and the corresponding conductive ring (12), and the bottom of the insulating tube (13) is vertically connected to the mounting plate (11). After the energy storage unit and the independent energy storage device are assembled with the connecting seat (1), the insulating tube (13) is inserted into the corresponding countersunk hole (221).

7. The solar-storage direct-flexible system according to claim 4, characterized in that: The mounting plate (11) is made of insulating material, and a spring (14) is provided between the bottom of the conductive ring (12) and the mounting plate (11). When the electrode (21) is connected to the conductive ring (12), the spring (14) is in a compressed state.

8. The solar-storage direct-flexible system according to claim 4 or 7, characterized in that: The centralized energy storage device is a cabinet structure, wherein an array is provided with a plurality of installation compartments for placing energy storage units, the bottoms of the installation compartments are provided with connection seats (1), and the open ends of the installation compartments are provided with door panels, and spring sheets are provided inside the door panels for pressing the energy storage units against the connection seats (1).

9. The solar-storage direct-flexible system according to claim 7, characterized in that: The connecting base (1) provided in the user unit has its conductive ring (12) facing upwards, and when the independent energy storage device is assembled, the electrode (21) faces downwards.

Images