Electrolytic aluminum power supply device and power supply system based on distributed photovoltaic direct current access

Abstract

The utility model provides an electrolytic aluminum power supply device and a power supply system based on distributed photovoltaic direct current access, which relate to the technical field of photovoltaic power generation, and are characterized in that a distributed photovoltaic module comprises a plurality of photovoltaic panels, and the plurality of photovoltaic panels are connected with the input end of a combiner box; the combiner box is connected to the input end of the boost energy router through a transmission medium. The output end of the boost energy router is connected to the input end of the medium-voltage DC protection module. The output end of the medium-voltage direct-current protection module is connected with the input end of the step-down energy router; the output end of the voltage reduction energy router is connected to the electrolytic aluminum bus through the electrolytic aluminum bus protection module. The photovoltaic power generation is subjected to boost and current reduction through the boost energy router, so that long-distance transportation of the photovoltaic power generation is realized, electric energy loss caused by long-distance transportation of electric energy is reduced, and the utilization efficiency of the photovoltaic power generation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, and in particular to an aluminum electrolytic power supply device and a power supply system based on distributed photovoltaic direct current access. Background Art

[0002] As an important basic industry in my country, the electrolytic aluminum production process consumes a high level of electricity and has always been called a "high energy-consuming industry". Therefore, it is also one of the industries that the country focuses on regulating. At present, most of my country's electrolytic aluminum enterprises use large power grids to supply power to the electrolytic cells. The power conversion links are numerous and complex, and the power loss is serious.

[0003] At present, a large number of new energy sources are used to generate electricity for electrolytic aluminum. For high-energy-consuming industrial loads such as electrolytic aluminum powered by DC, the power consumption range is wide and has good control characteristics. However, in the current power supply mode of new energy generation, serious power loss is caused in the power conversion process, which wastes a lot of resources and reduces power efficiency. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the first purpose of the utility model is to propose an electrolytic aluminum power supply device based on distributed photovoltaic direct current access.

[0006] The second objective of the present invention is to provide a power supply system.

[0007] To achieve the above-mentioned purpose, the first embodiment of the utility model proposes an electrolytic aluminum power supply device based on distributed photovoltaic DC access, comprising:

[0008] Distributed photovoltaic modules, combiner boxes, boost energy routers, medium voltage DC protection modules, step-down energy routers, and electrolytic aluminum busbar protection modules;

[0009] The distributed photovoltaic module includes a plurality of photovoltaic panels, and the plurality of photovoltaic panels are connected to the input end of the combiner box;

[0010] The combiner box is connected to the input end of the boost energy router via a transmission medium;

[0011] The output end of the boost energy router is connected to the input end of the medium voltage DC protection module;

[0012] The output end of the medium voltage DC protection module is connected to the input end of the step-down energy router;

[0013] The output end of the step-down energy router is connected to the electrolytic aluminum busbar through the electrolytic aluminum busbar protection module.

[0014] Optionally, the multiple photovoltaic panels are connected in parallel to the input end of the combiner box.

[0015] Optionally, the device further comprises: a photovoltaic bus cable protection fuse, and the output end of the bus box is connected to the input end of the boost energy router through the photovoltaic bus cable protection fuse.

[0016] Optionally, the transmission medium is a cable or an aluminum bus.

[0017] Optionally, the low-voltage side of the boost energy router is connected to the input end of the boost energy router, and the high-voltage side of the boost energy router is connected to the output end of the boost energy router; the connection method of the low-voltage side of the boost energy router is group series connection; the connection method of the high-voltage side of the boost energy router is group parallel connection.

[0018] Optionally, the high voltage side of the step-down energy router is connected to the input end of the step-down energy router, and the low voltage side of the step-down energy router is connected to the output end of the step-down energy router; the connection method of the low voltage side of the step-down energy router is group series connection; the connection method of the high voltage side of the step-down energy router is group parallel connection.

[0019] Optionally, the medium voltage DC protection module includes: a feed-in protection box, a transmission cable and a feed-out protection box;

[0020] The input end of the feed-in protection box is connected to the output end of the boost energy router;

[0021] The output end of the feed-in protection box is connected to the input end of the feed-out protection box through the transmission cable;

[0022] The output end of the feed-out protection box is connected to the input end of the step-down energy router.

[0023] Optionally, the electrolytic aluminum busbar protection module includes: an electromagnetic interference filter module, an isolating switch, a check valve group, and a heat dissipation fan;

[0024] The input end of the electromagnetic interference filter module is connected to the input end of the electrolytic aluminum busbar protection module;

[0025] The output end of the electromagnetic interference filter module is connected to the first end of the isolation switch through the check valve group;

[0026] The second end of the isolating switch is connected to the output end of the electrolytic aluminum busbar protection module.

[0027] Optionally, the device also includes a current stabilization module, the input end of the current stabilization module is connected to the output end of the electrolytic aluminum busbar protection module, and is used to adjust the output current of the non-photovoltaic power supply module according to the output current of the output end of the electrolytic aluminum busbar protection module.

[0028] To achieve the above-mentioned purpose, the second aspect of the present invention proposes an electrolytic aluminum power supply system based on distributed photovoltaic DC access, including: an electrolytic aluminum power supply device based on distributed photovoltaic DC access as described in the first aspect.

[0029] The utility model provides an electrolytic aluminum power supply method, device, electronic device and storage medium based on distributed photovoltaic direct current access, which boosts the voltage and reduces the current of photovoltaic power generation through a boost energy router, thereby realizing long-distance transportation of photovoltaic power generation, reducing the power loss caused by high-voltage long-distance transportation of electric energy, and improving the utilization efficiency of photovoltaic power generation.

[0030] The output current of photovoltaic DC access is automatically coordinated with the output current of the existing AC rectifier system through the current stabilization module, so that the total current of the electrolytic aluminum bus input follows the control setting, realizing automatic control of the electrolytic aluminum power supply system and improving the stability of power supply.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0033] Figure 1 A schematic structural diagram of an aluminum electrolytic power supply device based on distributed photovoltaic DC access provided in an embodiment of the utility model.

[0034] Figure 2 A schematic structural diagram of an electrolytic aluminum busbar protection module provided in an embodiment of the utility model.

[0035] Figure 3 A schematic diagram of the structure of a flow stabilization module provided in an embodiment of the utility model.

[0036] The accompanying drawings are described as follows: distributed photovoltaic module 10, junction box 20, boost energy router 30, medium voltage DC protection module 40, step-down energy router 50, electrolytic aluminum busbar protection module 60, electrolytic aluminum busbar 70, photovoltaic panel 11, photovoltaic bus cable protection fuse 80, feed-in protection box 41, transmission cable 42, feed-out protection box 43, electromagnetic interference filter module 61, isolating switch 63, check valve group 62, heat dissipation fan 64, and flow stabilization module 90. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] As an important basic industry in my country, the electrolytic aluminum production process consumes a high level of electricity and has always been called a "high energy-consuming industry". Therefore, it is also one of the industries that the country focuses on regulating. At present, most of my country's electrolytic aluminum enterprises use large power grids to supply power to electrolytic cells. The power conversion links are many and complex, and the power loss is serious. In addition, the power source of electrolytic aluminum enterprises is still mainly thermal power, accounting for more than 80%. Electrolytic aluminum enterprises use thermal power to produce one ton of aluminum, which emits about 11.2 tons of carbon dioxide, which is not conducive to the sustainable development of enterprises and the improvement of environmental friendliness.

[0039] With the rapid development of domestic new energy, some high-energy-consuming production enterprises, mainly in the non-ferrous metal industry, have planned or started to build a large number of new energy power generation in order to reduce electricity costs and effectively improve corporate competitiveness. They choose to build their own units or switch from networked operation to isolated grid operation. For high-energy-consuming industrial loads powered by DC power such as electrolytic aluminum, their power consumption range is relatively wide and they have good control characteristics, which are suitable for new energy DC access without affecting the stability of the power system.

[0040] At present, the domestic and foreign electrolytic aluminum industry mainly adopts the grid-connected mode for the access of new energy. In 2022, the first distributed photovoltaic project of the domestic electrolytic aluminum plant will be fully connected to the grid for power generation. Existing research or projects have failed to fully tap the potential of photovoltaics in the power supply of electrolytic aluminum enterprises, and the power conversion process in the existing large-scale power grid rectification power supply mode has caused serious power loss and resource waste.

[0041] The traditional solution collects photovoltaics into the photovoltaic busbar through MPPT, and then goes through inverter-power frequency isolation-rectification, and then into the 1235V DC busbar of the electrolyzer. The disadvantages of this solution are: low efficiency, large volume and mass, need for a special installation platform, difficult installation, high heat dissipation requirements, and the station photovoltaic inverter does not have the ability to operate independently in a network. Photovoltaic energy undergoes four-level losses: MPPT, DC / AC, power frequency isolation transformer, and AC / DC, and the overall efficiency is expected to be low.

[0042] To address this problem, the present invention provides an electrolytic aluminum power supply method based on distributed photovoltaic DC access. Figure 1 The schematic diagram of the structure of an electrolytic aluminum power supply device based on distributed photovoltaic DC access provided by the embodiment of the utility model. Figure 1As shown, the device comprises:

[0043] Distributed photovoltaic module 10, combiner box 20, boost energy router 30, medium voltage DC protection module 40, step-down energy router 50, electrolytic aluminum busbar protection module 60;

[0044] The distributed photovoltaic module 10 includes a plurality of photovoltaic panels 11, and the plurality of photovoltaic panels 11 are connected to the input end of the combiner box 20;

[0045] The combiner box 20 is connected to the input end of the boost energy router 30 through a transmission medium;

[0046] The output end of the boost energy router 30 is connected to the input end of the medium voltage DC protection module 40;

[0047] The output end of the medium voltage DC protection module 40 is connected to the input end of the step-down energy router 50;

[0048] The output end of the step-down energy router 50 is connected to the electrolytic aluminum bus 70 through the electrolytic aluminum bus protection module 60 .

[0049] In this embodiment, the distributed photovoltaic module 10 is built on the roof of the electrolysis room or the open space of the factory building. The installed capacity is calculated according to the area, and the distributed photovoltaic module 10 adopts a full self-use operation mode. The multiple photovoltaic panels 11 are all made of crystalline silicon components, which are connected to a boost energy router 30 in series.

[0050] In a possible embodiment, the operating environment of the device is: ambient temperature -10°C ~ +40°C; altitude ≤3000m, with capacity reduction above 3000m; relative humidity ≤95% (at 20°C), no condensation; rated voltage of the electrolytic aluminum busbar 1100VDC (basically stable without considering the slot effect); electrolytic aluminum capacity current of approximately 350kA (kiloamperes).

[0051] The boost energy router 30, the medium voltage DC protection module 40, and the step-down energy router 50 form a stable flexible medium voltage DC microgrid. During operation, the electric energy generated by each distributed photovoltaic module 10 is collected together and boosted through the boost energy router 30, so as to increase the output voltage and reduce the output current. The output low current is transmitted over a long distance through the medium voltage DC protection module 40 and transported to the step-down energy router 50 near the electrolytic aluminum busbar for step-down, and the high current is output to the electrolytic aluminum busbar 70.

[0052] The aluminum electrolytic busbar protection module 60 is used to protect the aluminum electrolytic busbar, which is one of the important components of the aluminum electrolytic plant. When the aluminum electrolytic busbar fails, if the fault is not removed in time, it will damage many power equipment, destroy the stability of the aluminum electrolytic plant, cause power outages in the aluminum electrolytic plant, and in serious cases cause the collapse of the entire power system.

[0053] The electrolytic aluminum busbar protection module 60 is an important system equipment to ensure the safe and stable operation of the power grid. Its safety, reliability, sensitivity and rapidity are of decisive significance to ensure the safety of the entire regional electrolytic aluminum plant. Therefore, it is very necessary to set up a busbar protection with reliable action and good performance so that it can quickly detect the location of the busbar fault and timely and selectively remove the fault.

[0054] In this embodiment, the voltage of photovoltaic power generation is increased and the current is reduced by the voltage-boosting energy router, thereby realizing the long-distance transportation of photovoltaic power generation, reducing the power loss caused by high-voltage long-distance transportation of electric energy, and improving the utilization efficiency of photovoltaic power generation.

[0055] Optionally, the modules in this device are also connected to the central control system, which can obtain the current, voltage and other data of each module in the device and visualize them. It can also realize the functions of power generation control, operation status display and fault information query of medium-voltage DC microgrid; at the same time, it can draw the real-time curve of current and voltage according to the data collected by each module, and record them reliably, so that the data of each period can be reviewed at any time. At regular intervals, relevant data can be automatically copied to form a record table; when the equipment automatically starts and stops every day, it can send information and automatically record the time.

[0056] Optionally, the multiple photovoltaic panels 11 are connected in parallel to the input end of the combiner box 20 .

[0057] In this embodiment, the junction box 20 is a wiring device that ensures the orderly connection and junction function of the photovoltaic panels 11 in the photovoltaic power generation system. It means that the user can connect a certain number of photovoltaic panels 11 of the same specifications in series to form photovoltaic strings, and then connect several photovoltaic strings in parallel to the junction box 20.

[0058] Optionally, the combiner box 20 is composed of the following parts:

[0059] 1. The box body is generally made of steel plate spraying, stainless steel, engineering plastics and other materials. It has beautiful appearance, is strong and durable, and is easy to install. The protection level reaches IP54 or above. It is waterproof and dustproof, and meets the requirements of long-term outdoor use.

[0060] 2. The DC circuit breaker is the output control device of the entire combiner box, mainly used for the opening / closing of the line. Its working voltage is as high as DC1000V. Since the power generated by solar panels is direct current, arcing is easy to occur when the circuit is broken. Therefore, when selecting, its temperature and altitude derating coefficient must be fully considered, and a DC circuit breaker dedicated to photovoltaics must be selected.

[0061] 3. DC fuses. When reverse current flows through the components, the DC fuses used for photovoltaic modules can cut off the faulty strings in time. The rated working voltage is DC1000V, and the rated current is generally 15A (crystalline silicon modules). The DC fuses used for photovoltaic modules are special fuses designed for photovoltaic systems. They are installed on a special closed base to prevent reverse current from flowing between strings and burning the components. When reverse current flows, the DC fuses quickly remove the faulty strings from the system without affecting other strings that are working normally. They can safely protect the photovoltaic strings and their conductors from the threat of reverse overload current.

[0062] 4. Anti-reverse diodes: The functions of diodes in the junction box and the diodes in the module junction box are different. The diodes in the module junction box mainly provide a freewheeling channel when the battery cell is blocked, while the diodes in the junction box mainly prevent the generation of circulating current between strings.

[0063] 5. Data acquisition module: In order to facilitate monitoring of the working status of the entire power station, a data acquisition module is generally added to the primary combiner box. Using Hall current sensor and single-chip microcomputer technology, the current signal (analog quantity) of each photovoltaic array is sampled, and after A / D conversion into digital quantity, it is converted into a standard RS-485 digital quantity signal output, which is convenient for users to grasp the working status of the entire power station in real time.

[0064] 6. The DC high-voltage surge protection unit is a lightning protection product specially designed for photovoltaic power generation systems. It has dual self-protection functions of overheating and overcurrent. It adopts a modular design, can be replaced with power on, and has a degradation display window. It can be equipped with a remote signal alarm device, and remote monitoring can be achieved using a data acquisition module.

[0065] 7. Human-machine interface. The data acquisition unit is equipped with a human-machine interface. Through the human-machine interface, the real-time working status of the equipment can be viewed, the real-time working status of the equipment can be realized through the keyboard, and the local setting of equipment parameters can be realized through the keyboard.

[0066] Optionally, the device further includes: a photovoltaic bus cable protection fuse 80 , and the output end of the combiner box 20 is connected to the input end of the boost energy router 30 through the photovoltaic bus cable protection fuse 80 .

[0067] In this embodiment, when the backflow current occurs in the components, the photovoltaic bus cable protection fuse 80 can cut off the faulty string in time. The rated working voltage is DC1000V, and the rated current is generally selected as 15A (crystalline silicon components). The photovoltaic bus cable protection fuse 80 is a special fuse designed for photovoltaic systems. It is installed using a special closed base to prevent the backflow of current between strings and burn the components. When the backflow of current occurs, the photovoltaic bus cable protection fuse 80 quickly withdraws the faulty string from the system operation, and does not affect other strings that are working normally, and can safely protect the photovoltaic strings and their conductors from the threat of reverse overload current.

[0068] Optionally, the transmission medium is a cable or an aluminum bus.

[0069] Optionally, the low-voltage side of the boost energy router 30 is connected to the input end of the boost energy router 30, and the high-voltage side of the boost energy router 30 is connected to the output end of the boost energy router 30; the connection method of the low-voltage side of the boost energy router 30 is group series connection; the connection method of the high-voltage side of the boost energy router 30 is group parallel connection.

[0070] Optionally, the high-voltage side of the step-down energy router 50 is connected to the input end of the step-down energy router 50, and the low-voltage side of the step-down energy router 50 is connected to the output end of the step-down energy router 50; the connection mode of the low-voltage side of the step-down energy router 50 is group series connection; the connection mode of the high-voltage side of the step-down energy router 50 is group parallel connection.

[0071] In this embodiment, in order to meet the source and load voltage levels and DC transmission requirements, the power distribution of the medium voltage DC microgrid needs to be converted between low voltage and high voltage. The power conversion of the medium voltage DC microgrid adopts a boost energy router 30 and a buck energy router 50, which use standard power electronic power modules (PEBB). The standard PEBB module combination is used for photovoltaic DC conversion, energy storage DC conversion, auxiliary machine DC conversion and hydrogen production power DC conversion in the medium voltage DC microgrid.

[0072] According to the voltage conversion and power conversion requirements of the DC microgrid, the PEBB power conversion module adopts the method of low-voltage side group series connection and high-voltage side group parallel connection, which can be configured into a variety of output voltages, and can flexibly control the low-voltage side voltage and power flow according to the load requirements. According to the project requirements, it is combined into a boost energy router 30 and a buck energy router 50 for various DC voltage and power conversion. The DCDC DC power supply has MPPT characteristics, adopts soft switching technology design, modular design, and adopts advanced digital control technology to ensure high precision, low ripple, fast voltage and current dynamic response speed, high efficiency, and low power loss of the DC power supply output.

[0073] In this medium-voltage DC microgrid, the photovoltaic side boost energy router 30 boosts the photovoltaic 1300VDC DC voltage to 20kVDC for long-distance transmission, reducing system losses and improving transmission efficiency. The load side step-down energy router 50 steps down the 20kVDC DC voltage to the electrolytic aluminum bus voltage, directly supplying photovoltaic new energy electricity to the electrolytic aluminum bus.

[0074] Optionally, the medium voltage DC protection module 40 includes: a feed-in protection box 41, a transmission cable 42 and a feed-out protection box 43;

[0075] The input end of the feed-in protection box 41 is connected to the output end of the boost energy router 30;

[0076] The output end of the feed-in protection box 41 is connected to the input end of the feed-out protection box 43 through the transmission cable 42;

[0077] The output end of the feed protection box 43 is connected to the input end of the step-down energy router 50 .

[0078] Figure 2 This is a schematic diagram of the structure of an electrolytic aluminum busbar protection module 60 provided in an embodiment of the utility model. Figure 2 As shown, the electrolytic aluminum busbar protection module 60 includes: an electromagnetic interference filter module 61, an isolating switch 63, a check valve group 62, and a heat dissipation fan 64;

[0079] The input end of the electromagnetic interference filter module 61 is connected to the input end of the electrolytic aluminum busbar protection module 60;

[0080] The output end of the electromagnetic interference filter module 61 is connected to the first end of the isolation switch 63 through the check valve group 62;

[0081] The second end of the isolating switch 63 is connected to the output end of the electrolytic aluminum busbar protection module 60 .

[0082] In this embodiment, the electric energy generated by the photovoltaic panel 11 needs to be connected to the electrolytic aluminum busbar through the electrolytic aluminum busbar protection module 60 after being converted into a DC voltage by the DC microgrid. The electrolytic aluminum busbar protection module 60 can realize functions such as energy flow direction restriction, line protection, line filtering, and inspection and maintenance of DC microgrid equipment. It is installed near the electrolytic aluminum busbar, and the top output is connected to the aluminum bar of the electrolytic aluminum busbar bridge.

[0083] The electrolytic aluminum busbar protection module 60 is used for the collection and protection of various energies in the power grid system. It uses a check valve group 62 composed of low-loss high-voltage diodes and an isolating switch 63 to automatically disconnect short-circuit faults occurring on the transmission line. The configuration of the electromagnetic interference filter (EMI) module 61 can effectively reduce the interference of the power ripple of the electrolytic busbar on the power generation side equipment.

[0084] Electromagnetic interference refers to the electromagnetic interference phenomenon caused by the interaction between electromagnetic waves and electronic components. Electromagnetic interference can be divided into two types: conducted interference and radiated interference. Some also divide it into three types: conducted interference, coupled interference and radiated interference. The electromagnetic interference filter module 61 can suppress high-frequency harmonics and high-order harmonics to eliminate electromagnetic interference and achieve electromagnetic compatibility (EMC) status. The isolation switch 63 is equivalent to a fuse, which can automatically disconnect a short circuit fault on the transmission line.

[0085] Figure 3 Schematic diagram of the structure of a flow stabilization module 90 provided in an embodiment of the utility model. Figure 3 As shown, the device also includes a current stabilization module 90, the input end of which is connected to the output end of the electrolytic aluminum busbar protection module 60, and is used to adjust the output current of the non-photovoltaic power supply module according to the output current of the output end of the electrolytic aluminum busbar protection module 60.

[0086] The current stabilization module 90 is connected to the transformation to automatically coordinate the output power (current) of the photovoltaic DC access with the output power (current) of the existing AC rectifier system, so that the total current of the electrolytic cell follows the control given. In the actual operation process, the voltage, current and power of the photovoltaic power supply depend on the weather conditions and are not stable enough. In order to maintain the stability of the current and power input to the aluminum smelter, in addition to the photovoltaic power supply, the aluminum smelter also receives the power input generated by other power generation methods (such as thermal power, hydropower, and nuclear power). The current stabilization module 90 can coordinate the output current of the photovoltaic power and the non-photovoltaic power supply module, so that the current input to the aluminum smelter is maintained at a specific value, which can ensure the smooth operation of the aluminum smelter.

[0087] The specific steps are as follows: the first current value output by each medium-voltage DC microgrid (aluminum electrolytic busbar protection module 60) is sent to the current stabilization module 90 via communication; the current stabilization module 90 obtains a second current value by subtracting the sum of the first current values ​​output by each medium-voltage DC microgrid from the preset current; the second current value is used as the current actually executed by the current stabilization module 90 to control the rectifier system, that is, to adjust the output current of the non-photovoltaic power supply module to reach the second current value.

[0088] In a possible embodiment, a split-regulation method is adopted, that is, the currents output from multiple non-photovoltaic power supply modules are equal, then each current stabilization module 90 obtains a second current value by subtracting the sum of the first current values ​​output by each medium-voltage DC microgrid from the preset current, determines that the output current of the non-photovoltaic power supply module is 1 / n of the second current value, and performs rectification and output according to the current value, where n is the number of non-photovoltaic power supply modules currently in operation. Optionally, the preset current is 100kA, and the sum of the first current values ​​output by the medium-voltage DC microgrid is 90kA, then the second current value is 10kA, at this time if there are 10 non-photovoltaic power supply modules supplying power to the electrolytic aluminum plant, then the current output by these non-photovoltaic power supply modules is adjusted to 1kA.

[0089] The low-voltage PET and medium-voltage EMS of the DC microgrid are wired to the central control module through multi-mode optical cables, and connected to the industrial computer of the central control module through optical terminals and Ethernet switches, and the current output current value communication signal is sent with MODBUS TCP signals. The network cable is connected from the Ethernet switch to the current stabilization controller of the rectifier system.

[0090] In order to implement the above embodiments, the utility model also proposes a system, characterized in that it includes: an electrolytic aluminum power supply device based on distributed photovoltaic direct current access as described in any one of the above embodiments.

[0091] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this utility model shall comply with the provisions of relevant laws and regulations and shall not violate public order and good morals.

[0092] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0093] The utility model is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, personal identification is removed from such personal information to protect the privacy of the user.

[0094] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0095] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0096] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0097] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0098] It should be understood that the various parts of the utility model can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0099] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0100] In addition, each functional unit in each embodiment of the utility model can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0101] The storage medium mentioned above may be a read-only memory, a disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An electrolytic aluminum power supply device based on distributed photovoltaic DC access, characterized in that: include: Distributed photovoltaic modules, combiner boxes, boost energy routers, medium voltage DC protection modules, step-down energy routers, and electrolytic aluminum busbar protection modules; The distributed photovoltaic module includes a plurality of photovoltaic panels, and the plurality of photovoltaic panels are connected to the input end of the combiner box; The combiner box is connected to the input end of the boost energy router via a transmission medium; The output end of the boost energy router is connected to the input end of the medium voltage DC protection module; The output end of the medium voltage DC protection module is connected to the input end of the step-down energy router; The output end of the step-down energy router is connected to the electrolytic aluminum busbar through the electrolytic aluminum busbar protection module.

2. The device according to claim 1, characterized in that The multiple photovoltaic panels are connected in parallel to the input end of the combiner box.

3. The device according to claim 1, characterized in that The device further comprises: a photovoltaic bus cable protection fuse, and the output end of the bus box is connected to the input end of the boost energy router through the photovoltaic bus cable protection fuse.

4. The device according to claim 1, characterized in that The transmission medium is a cable or an aluminum busbar.

5. The device according to claim 1, characterized in that The low-voltage side of the boost energy router is connected to the input end of the boost energy router, and the high-voltage side of the boost energy router is connected to the output end of the boost energy router; the connection mode of the low-voltage side of the boost energy router is group series connection; the connection mode of the high-voltage side of the boost energy router is group parallel connection.

6. The device according to claim 1, characterized in that The high-voltage side of the step-down energy router is connected to the input end of the step-down energy router, and the low-voltage side of the step-down energy router is connected to the output end of the step-down energy router; the connection mode of the low-voltage side of the step-down energy router is group series connection; the connection mode of the high-voltage side of the step-down energy router is group parallel connection.

7. The device according to claim 1, characterized in that The medium voltage DC protection module comprises: a feed-in protection box, a transmission cable and a feed-out protection box; The input end of the feed-in protection box is connected to the output end of the boost energy router; The output end of the feed-in protection box is connected to the input end of the feed-out protection box through the transmission cable; The output end of the feed-out protection box is connected to the input end of the step-down energy router.

8. The device according to claim 1, characterized in that The electrolytic aluminum busbar protection module includes: an electromagnetic interference filter module, an isolating switch, a check valve group, and a heat dissipation fan; The input end of the electromagnetic interference filter module is connected to the input end of the electrolytic aluminum busbar protection module; The output end of the electromagnetic interference filter module is connected to the first end of the isolation switch through the check valve group; The second end of the isolating switch is connected to the output end of the electrolytic aluminum busbar protection module.

9. The device according to claim 1, characterized in that The device also includes a current stabilization module, the input end of which is connected to the output end of the electrolytic aluminum busbar protection module, and is used to adjust the output current of the non-photovoltaic power supply module according to the output current of the output end of the electrolytic aluminum busbar protection module.

10. A power supply system, characterized in that: include: An electrolytic aluminum power supply device based on distributed photovoltaic direct current access as described in any one of claims 1 to 9.

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