Optical storage system

Abstract

The invention relates to the technical field of clean energy, and discloses a light storage system which comprises a plurality of integrated photovoltaic modules with positive electrodes and negative electrodes connected in series, the output ends of the integrated photovoltaic modules are connected with the photovoltaic input end of an intelligent confluence cabinet, and the battery input end of the intelligent confluence cabinet is connected with multiple paths of energy storage batteries. The output end of the intelligent confluence cabinet is connected with the direct current input end of the bidirectional inverter; the intelligent control system is used for adjusting system operation parameters in real time according to the power generation condition of the integrated photovoltaic module, the charging and discharging state of the battery and the load requirement, and the intelligent control system is in communication connection with the integrated photovoltaic module, the intelligent confluence cabinet, the battery management system and the bidirectional inverter. The battery management system is in communication connection with the energy storage battery; the problems that in the prior art, the power generation efficiency of the photovoltaic module is greatly influenced by individual differences and shadow shielding, the power loss in the electric energy conversion link is large, and the system integration degree is not high are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clean energy, in particular to a light storage system. BACKGROUND

[0002] With the increasing demand for clean energy, light storage systems, as an effective way to combine solar power generation and energy storage, have received widespread attention. Traditional light storage systems often have some problems, for example, in the photovoltaic component part, when some components are shaded or the output power is inconsistent due to individual differences, it will affect the power generation efficiency of the whole system. Moreover, the power conversion path of the traditional light storage system is complex, and after several conversion links, the power loss is large. For example, the common light storage system needs to convert the direct current generated by the photovoltaic component into alternating current through an alternating current inverter, and then process it, which will cause energy loss in the process. SUMMARY

[0003] The purpose of the present application is to provide a light storage system to solve the problems of the prior art that the photovoltaic component power generation efficiency is greatly affected by individual differences and shadow shielding, the power loss of the energy conversion link is large, and the system integration is not high.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] The light storage system of the present application comprises a plurality of integrated photovoltaic components connected in series, the output end of the integrated photovoltaic component is connected with the photovoltaic input end of the intelligent busbar cabinet, the battery input end of the intelligent busbar cabinet is connected with a plurality of energy storage batteries, the output end of the intelligent busbar cabinet is connected with the direct current input end of the bidirectional inverter, and the alternating current output end of the bidirectional inverter is used to connect the user load or the power grid.

[0006] It also includes an intelligent control system for adjusting the system operation parameters in real time according to the power generation of the integrated photovoltaic component, the charge and discharge state of the battery, and the load demand, the intelligent control system is respectively connected with the integrated photovoltaic component, the intelligent busbar cabinet, the battery management system, and the bidirectional inverter in communication, and the battery management system is connected with the energy storage battery in communication.

[0007] Further, the integrated photovoltaic component comprises a photovoltaic panel component, the photovoltaic panel component is connected with a photovoltaic power optimizer and a junction box, the photovoltaic power optimizer and the junction box are integrated into one body and fixedly installed on the photovoltaic panel component, and the photovoltaic power optimizer adopts a photovoltaic power optimizer with a maximum power point tracking function.

[0008] Further, the photovoltaic input end and the battery input end of the intelligent busbar cabinet are both connected with a direct current fuse for protection.

[0009] Further, the battery input end of the intelligent bus cabinet is connected with a direct current contactor for on-off control, the direct current contactor is connected in series with the energy storage battery and the direct current fuse, and the direct current contactor is in communication connection with the intelligent control system through a monitoring module.

[0010] Compared with the prior art, the application has the following beneficial effects:

[0011] 1. Improve power generation efficiency: through the integrated design of integrating the photovoltaic power optimizer with the junction box and connecting the photovoltaic panel assembly, by adopting the photovoltaic power optimizer with the maximum power point tracking function, the maximum power point tracking of the single component is realized, effectively solving the power generation loss caused by photovoltaic component mismatch, shadow shielding and other problems, and significantly improving the power generation efficiency compared with the traditional system.

[0012] 2. Reduce power loss: omit the AC inverter link, reduce the multi-stage conversion required for energy storage battery charging and discharging, directly control the photovoltaic assembly to charge the energy storage battery, reduce the power loss in the conversion process, and improve the overall energy conversion efficiency of the system.

[0013] 3. Enhance system stability: the application adopts integrated design and intelligent control, so that the cooperation between the components is more smooth, the operating parameters can be adjusted in real time according to different working conditions, and the stability and reliability of the system are enhanced.

[0014] 4. Reduce cost: reduce the use of AC inverter and other components, reduce the equipment procurement cost and maintenance cost; at the same time, the improved power generation efficiency and energy conversion efficiency can also bring more economic benefits in long-term operation.

[0015] 5. Improve the safety and reliability of the connection between the energy storage battery and the bidirectional inverter: the energy storage battery and the bidirectional inverter are connected and protected by the intelligent control system, which can effectively avoid damage to the battery and the bidirectional inverter caused by abnormal circuit, prolong the service life of the equipment; at the same time, the communication connection between the two realizes real-time interaction of information, so that the system can intelligently adjust the operation strategy according to the battery state, further improving the safety and reliability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0017] Figure 1 It is a circuit structure schematic diagram of the application.

[0018] Reference signs: integrated photovoltaic module 1; intelligent combiner cabinet 2; energy storage battery 3; bidirectional inverter 4; battery management system 5; intelligent control system 6; monitoring module 7; DC fuse 8; DC contactor 9. DETAILED DESCRIPTION

[0019] The present application is described in greater detail by the specific embodiments below, from which other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification. The present application can also be implemented or applied by other different embodiments, and various modifications or changes can be made to the details in the present specification based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the layers related to the present application are shown in the drawings, not drawn according to the number of layers, shapes and sizes in actual implementation. The actual implementation of each layer can be a random change, and the layer layout pattern can also be more complex.

[0021] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details.

[0022] Please refer to Figure 1 A light storage system includes a plurality of integrated photovoltaic modules 1 connected in series, the output end of the integrated photovoltaic module 1 is connected with the photovoltaic input end of the intelligent combiner cabinet 2, the battery input end of the intelligent combiner cabinet 2 is connected with a plurality of energy storage batteries 3, the output end of the intelligent combiner cabinet 2 is connected with the DC input end of the bidirectional inverter 4, and the AC output end of the bidirectional inverter 4 is used to connect the user load or the power grid.

[0023] It also includes an intelligent control system 6 for adjusting the system operation parameters in real time according to the power generation of the integrated photovoltaic module 1, the charge and discharge state of the battery, and the load demand, the intelligent control system 6 is respectively connected with the integrated photovoltaic module 1, the intelligent combiner cabinet 2, the battery management system 5, and the bidirectional inverter 4, and the battery management system 5 is connected with the energy storage battery 3.

[0024] The integrated photovoltaic module 1 includes a photovoltaic panel assembly, the photovoltaic panel assembly is connected with a photovoltaic power optimizer and a junction box, the photovoltaic power optimizer and the junction box are integrated, and are fixedly installed on the photovoltaic panel assembly.

[0025] The photovoltaic power optimizer has a maximum power point tracking function.

[0026] The photovoltaic input end and the battery input end of the intelligent combiner 2 are connected with DC fuses 8 for protection.

[0027] The battery input end of the intelligent combiner 2 is connected with a DC contactor 9 for on-off control, the DC contactor 9 is connected in series with the energy storage battery 3 and the DC fuse 8, and the DC contactor 9 is connected in communication with the intelligent control system 6 through the monitoring module 7.

[0028] In practical application, please refer to Figure 1 , including integrated photovoltaic module 1, intelligent combiner 2, energy storage battery 3, bidirectional inverter 4, battery management system 5, intelligent control system 6. Through integrated design of the whole photovoltaic storage system, the integrated photovoltaic module 1, intelligent combiner 2, energy storage battery 3 and bidirectional inverter 4 are reasonably arranged to reduce the length of system wiring and power conversion process, thereby reducing the energy loss of the line. At the same time, through the intelligent control system 6, the components are uniformly managed and coordinated, according to the power generation of the integrated photovoltaic module 1, the charge and discharge state of the battery and the load demand, the system operation parameters are adjusted in real time, and the overall operation efficiency and stability of the system are improved.

[0029] The integrated photovoltaic module 1 integrates the photovoltaic power optimizer and the junction box and connects with the photovoltaic panel assembly. The integrated photovoltaic power optimizer and the junction box are fixed to the back of the photovoltaic panel assembly by bolts or adhesion. The photovoltaic power optimizer in the integrated photovoltaic module 1 has a maximum power point tracking (MPPT) function, which can monitor and adjust the working state of the photovoltaic module in real time, so that it is always in the maximum power output state. Even if part of the photovoltaic module is shaded or has individual differences, the power optimizer of the integrated module can work independently to ensure that the module outputs maximum power as much as possible, avoiding affecting other normally working integrated photovoltaic modules, thereby improving the power generation efficiency of the whole photovoltaic array.

[0030] The intelligent combiner cabinet 2 contains multiple photovoltaic input ends Hn-1 to Hn-n and multiple battery input ends H1 to Hn. Each photovoltaic input end and battery input end is connected with a DC fuse 8 for protection. When the current in the circuit exceeds the rated current, the DC fuse 8 will melt, thereby cutting off the circuit. A DC contactor 9 is arranged at the battery input end. The DC contactor 9 is in communication connection with the intelligent control system 6 through the monitoring module 7 in the intelligent combiner cabinet 2. The intelligent control system 6 can remotely control the DC contactor 9 through the monitoring module 7 to realize on-off control and realize quick switching of the battery charging and discharging circuit. For example, when the energy storage battery 3 needs to be maintained or has a fault, the DC contactor 9 can be remotely disconnected to isolate the energy storage battery 3 from the intelligent combiner cabinet 2 and the bidirectional inverter 4.

[0031] After the positive and negative poles of the integrated photovoltaic module 1 are connected in series, the output end of the integrated photovoltaic module string is connected to the photovoltaic input end of the intelligent combiner cabinet 2 through a DC cable. The output cables of multiple integrated photovoltaic module strings are connected in the intelligent combiner cabinet 2. The multiple positive and negative output ends of the energy storage battery 3 are also connected in the intelligent combiner cabinet 2. The output end of the intelligent combiner cabinet 2 is connected to the DC input end of the bidirectional inverter 4. The AC output port of the bidirectional inverter 4 is used to connect the user load or the power grid.

[0032] The DC power generated by the integrated photovoltaic module 1 is directly collected through the intelligent combiner cabinet 2 after being optimized by the photovoltaic power optimizer of the integrated photovoltaic module 1. The DC power of multiple photovoltaic module strings is directly transmitted to the energy storage battery 3 for storage after being collected by the intelligent combiner cabinet 2. The DC power stored in the energy storage battery 3 is connected to the bidirectional inverter 4 through the intelligent combiner cabinet 2. The bidirectional inverter 4 converts the DC power into AC power and outputs it for use by the load or connection to the power grid. In this process, the intermediate link from the photovoltaic module to the AC inverter in the traditional system is omitted. The photovoltaic module is directly controlled to charge the energy storage battery 3, reducing the need for multiple stages of conversion for charging and discharging of the energy storage battery 3 and reducing power loss.

[0033] The integrated photovoltaic module 1, the intelligent DC collection cabinet 2, the battery management system 5, the bidirectional inverter 4 and the intelligent control system 6 are connected through a communication cable to establish a communication connection, and a communication protocol such as CAN bus, RS485 is adopted. The battery management system 5 sends the state information of the energy storage battery 3 to the intelligent control system 6 in real time, such as the voltage, current, temperature, SOC (State of Charge) and SOH (State of Health) of the energy storage battery 3. The intelligent control system 6 can adjust the working mode and output parameters of the intelligent DC collection cabinet 2 and the bidirectional inverter 4 according to the information, for example, when the SOC of the energy storage battery 3 is high, the intelligent control system 6 can appropriately reduce the charging current by controlling the intelligent DC collection cabinet 2 or the bidirectional inverter 4; similarly, when the temperature of the energy storage battery 3 is too high, the intelligent control system 6 can suspend the charging or discharging operation by controlling the intelligent DC collection cabinet 2 or the bidirectional inverter 4, and continue to work after the temperature returns to normal. At the same time, the intelligent control system 6 also feeds back the working state information of the intelligent DC collection cabinet 2 and the bidirectional inverter 4, such as output power and working mode, to the battery management system 5, to realize information interaction and cooperative control between the two.

[0034] The photovoltaic power optimizer is integrated with the junction box and connected with the photovoltaic panel assembly in the integrated design, so that the power optimization effect is ensured and the cost is reduced; the integrated photovoltaic module 1 and the energy storage battery 3 are directly connected to the bidirectional inverter 4 through the intelligent DC collection cabinet, so that the line and intermediate link loss is reduced. The present application can effectively reduce system loss, reduce system cost, optimize assembly process, and effectively improve the power generation efficiency of the photovoltaic system and the overall stability of the system.

[0035] In the above embodiments, although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Embodiments of this application are intended to embrace all such alternatives, modifications and variations as fall within the scope of the appended claims.

[0036] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A photovoltaic energy storage system, characterized in that: The system includes multiple integrated photovoltaic modules (1) connected in series with positive and negative electrodes. The output terminal of the integrated photovoltaic module (1) is connected to the photovoltaic input terminal of the intelligent combiner cabinet (2). The battery input terminal of the intelligent combiner cabinet (2) is connected to multiple energy storage batteries (3). The output terminal of the intelligent combiner cabinet (2) is connected to the DC input terminal of the bidirectional inverter (4). The AC output terminal of the bidirectional inverter (4) is used to connect to the user load or the power grid. It also includes an intelligent control system (6) for adjusting system operating parameters in real time according to the power generation of the integrated photovoltaic module (1), the charging and discharging status of the battery and the load demand. The intelligent control system (6) is communicatively connected to the integrated photovoltaic module (1), the intelligent combiner cabinet (2), the battery management system (5) and the bidirectional inverter (4). The battery management system (5) is communicatively connected to the energy storage battery (3).

2. The photovoltaic energy storage system according to claim 1, characterized in that, The integrated photovoltaic module (1) includes a photovoltaic panel assembly, which is connected to a photovoltaic power optimizer and a junction box. The photovoltaic power optimizer and the junction box are integrated into one unit and fixedly installed on the photovoltaic panel assembly. The photovoltaic power optimizer is a photovoltaic power optimizer with maximum power point tracking function.

3. The photovoltaic energy storage system according to claim 1, characterized in that, The photovoltaic input terminal and the battery input terminal of the intelligent combiner cabinet (2) are both connected to DC fuses (8) for protection.

4. The photovoltaic energy storage system according to claim 3, characterized in that, The battery input terminal of the intelligent combiner cabinet (2) is connected to a DC contactor (9) for on / off control. The DC contactor (9) is connected in series with the energy storage battery (3) and the DC fuse (8). The DC contactor (9) is connected to the intelligent control system (6) through the monitoring module (7).

Images