CN115864355B - Power supply device of distributed photovoltaic direct-current access aluminum electrolysis cell direct-current bus - Google Patents
Power supply device of distributed photovoltaic direct-current access aluminum electrolysis cell direct-current bus Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P80/00—Climate change mitigation technologies for sector-wide applications
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Abstract
The invention provides a power supply device for a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus, which relates to the technical field of aluminum electrolysis cell power supply and aims to realize direct supply of direct current to an aluminum electrolysis cell by photovoltaic power generation, and comprises a plurality of photovoltaic strings, 8 photovoltaic combiner boxes, 4 electric energy router PET modules, 4 feed-in protection modules, 2 feed-out breaker modules and 2 electrolytic aluminum bus protection modules; the multi-path photovoltaic strings are connected into photovoltaic junction boxes in a summarizing way, and every two photovoltaic junction boxes are connected to an electric energy router PET module together; each PET module of the electric energy router is respectively connected to a feed-in protection module; each two feed-in protection modules are commonly connected to one feed-out breaker module; the two feed-out breaker modules are respectively connected to an electrolytic aluminum bus protection module through a bridge aluminum row; the electrolytic aluminum busbar protection module is directly connected to the cell busbar. The photovoltaic direct power supply system has the advantages of direct photovoltaic power supply, stability and low energy consumption.
Description
Technical Field
The invention relates to the technical field of aluminum electrolysis cell power supply, in particular to a power supply device for a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus.
Background
Electrolytic aluminum belongs to the industry with high energy consumption and is also an important industry of carbon emission.
Aiming at the development requirement of low-carbon transformation in the high-energy-consumption electrolytic aluminum industry on new energy sources, an innovative method is needed to improve the renewable energy utilization level and the energy efficiency level in the electrolytic aluminum industry, so that transformation and upgrading are accelerated, and the green low-carbon development is realized. About 95% of the production electricity of the electrolytic aluminum enterprises is direct current power consumption of aluminum smelting, the auxiliary production electricity consumption is only about 5%, the existing domestic electrolytic aluminum enterprises are built into grid-connected distributed photovoltaic power generation access systems, the photovoltaic direct current is inverted into alternating current and connected into a 380V low-voltage or 10kV high-voltage power distribution system, and how to directly supply the photovoltaic direct current to the aluminum smelting production without power frequency inversion is an innovating application technology which has no significance before. The design of the existing distributed photovoltaic power station access system for the electrolytic aluminum enterprises mainly adopts the traditional access mode that the photovoltaic direct current is converted into alternating current and then is connected into a 380V low-voltage power distribution system or a 10kV high-voltage power distribution system.
If the distributed photovoltaic direct current can be directly connected into the direct current bus of the aluminum electrolysis cell through innovative research and development and experimental application, namely, the innovative application technology of directly supplying direct current to the aluminum electrolysis cell by photovoltaic power generation is based on a photovoltaic+electrolytic aluminum direct current micro-grid, the photovoltaic power generation is realized to directly supply power to the aluminum electrolysis cell, the electric energy loss in the inversion-rectification process is reduced, high-capacity photovoltaic power can be directly supplied to electrolytic aluminum production without being limited by a conventional auxiliary power system, the occupation ratio of renewable energy sources in the electrolytic aluminum production is greatly improved, and the in-situ digestion capacity of the photovoltaic power generation is improved.
Disclosure of Invention
The invention aims to provide a power supply device for a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus, which aims to realize direct supply of direct current to the aluminum electrolysis cell by photovoltaic power generation.
The embodiment of the invention is realized by the following technical scheme:
a power supply device of a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus comprises a plurality of photovoltaic strings, 8 photovoltaic combiner boxes, 4 electric energy router PET modules, 4 feed-in protection modules, 2 feed-out breaker modules and 2 electrolytic aluminum bus protection modules;
the multi-path photovoltaic strings are connected into the photovoltaic confluence boxes in a summarizing way, and the output ends of every two photovoltaic confluence boxes are connected to the input end of an electric energy router PET module together;
the output end of each PET module of the electric energy router is respectively connected to the input end of a feed-in protection module;
the output ends of every two feed-in protection modules are commonly connected to the input end of one feed-out breaker module;
the output end of each feed-out breaker module is connected to the input end of one electrolytic aluminum bus protection module through one bridge aluminum row respectively;
the output end of the electrolytic aluminum bus protection module is directly connected to the electrolytic cell bus.
Preferably, the number of the photovoltaic strings collected into each photovoltaic junction box is 18.
Preferably, the PET module of the electric energy router comprises a pre-charging module, an isolated DC/DC module and a filtering module which are sequentially connected;
the positive electrode input end and the negative electrode input end of the pre-charging module are respectively the positive electrode input end and the negative electrode input end of the PET module of the electric energy router, and the positive electrode output end and the negative electrode output end of the filtering module are respectively the positive electrode output end and the negative electrode output end of the PET module of the electric energy router;
the pre-charging module is used for limiting current when starting;
the isolation type DC/DC module is used for electrically isolating the input side and the output side of the PET module of the electric energy router;
the filtering module is used for filtering and noise reduction.
Preferably, the filtering module comprises a reactance, a capacitance and a first EMI filter which are sequentially connected in parallel between a positive electrode line and a negative electrode line of the PET module of the electric energy router;
the reactance and the capacitor are used for filtering the current output by the PET module of the electric energy router, and the first EMI filter is used for blocking high-frequency current between the PET module of the electric energy router and external equipment;
the positive electrode output end and the negative electrode output end of the first EMI filter are respectively the positive electrode output end and the negative electrode output end of the PET module of the electric energy router.
Preferably, the feed-in protection module comprises a first diode, a plurality of contactors and a plurality of isolating switches;
the first diode, the first contactor and the first isolating switch are sequentially connected in series on a positive line of the feed-in protection module;
the second contactor and the second isolating switch are sequentially connected in series on a negative line of the feed-in protection module;
the first isolating switch and the second isolating switch are controlled by a knife switch in a linkage way.
Preferably, the feed-out breaker module comprises a plurality of contactors, a plurality of disconnectors, a solid state breaker and a first lightning arrester;
the third isolating switch, the third contactor and the solid-state circuit breaker are sequentially connected in series on a positive pole line of the feed-out circuit breaker module;
the fourth isolating switch and the fourth contactor are sequentially connected in series on the negative pole circuit of the feed-out breaker module;
the output end of the solid-state circuit breaker is connected with the positive electrode of the first lightning arrester, the fourth contactor is connected with the negative electrode of the first lightning arrester, and the positive electrode output end and the negative electrode output end of the first lightning arrester are respectively the positive electrode output end and the negative electrode output end of the feed-out circuit breaker module;
the third isolating switch and the fourth isolating switch are controlled by a knife switch in a linkage way.
Preferably, the electrolytic aluminum bus protection module comprises a second lightning arrester, a second EMI filter, a residual current detection module, a plurality of check valve groups, a plurality of fuses and a plurality of isolating switches; the positive electrode input end and the negative electrode input end of the second lightning arrester are the positive electrode input end and the negative input and output end of the electrolytic aluminum bus protection module;
the positive electrode output end of the second lightning arrester is connected to the input end of the second EMI filter, the output end of the second EMI filter is connected to the positive electrode input end of the residual current detection module, the positive electrode output end of the residual current detection module is connected to the input end of the first check valve group, the output end of the first check valve group is connected to one end of the first fuse, and the other end of the first fuse is connected to one end of the fifth isolating switch;
the negative electrode output end of the second lightning arrester is connected with the negative electrode input end of the residual current detection module, the negative electrode output end of the residual current detection module is connected to the input end of the second check valve group, the output end of the second check valve group is connected to one end of the second fuse, and the other end of the second fuse is connected with one end of the sixth isolating switch;
the other end of the fifth isolating switch and the other end of the sixth isolating switch are respectively an anode output end and a cathode output end of the electrolytic aluminum bus protection module.
Preferably, the first check valve group comprises two diodes, an anode of the second diode is connected with an anode output end of the residual current detection module, a cathode of the second diode is connected with an anode of the third diode, and a cathode of the third diode is connected with one end of the first fuse.
Preferably, the second check valve group comprises two diodes, the cathode of the fourth diode is connected with the negative output end of the residual current detection module, the anode of the fourth diode is connected with the cathode of the fifth diode, and the anode of the fifth diode is connected with one end of the second fuse.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
the invention greatly improves the duty ratio of renewable energy sources in the production electricity of electrolytic aluminum and improves the in-situ digestion capacity of photovoltaic power generation;
the technology of the invention has strong controllability, more controllable links and controllable nodes, high control speed and rich control functions, and compared with the traditional power grid, the voltage and power control capability is greatly improved;
the invention adopts direct current power supply, the direct current circuit has no problems of stable frequency, reactive power and the like, and the invention can adopt a multi-bus redundancy or closed loop technology to improve the power supply reliability through flexible system topology, and has the advantages of high response speed and short recovery time;
the invention has the advantages of large power supply capacity, stable power supply and capability of greatly improving the conveying capacity, and reduces the problems of energy loss and electric energy quality caused by multiple times of current conversion;
the direct-current micro-grid system does not need to consider the voltage phase and the system frequency, only needs to pay attention to the direct-current bus voltage, the current and the system power, and has higher reliability and controllability on the control system level.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a power supply device for connecting a distributed photovoltaic direct current to a direct current bus of an aluminum electrolysis cell according to embodiment 1 of the present invention;
fig. 2 is a schematic circuit diagram of a PET module of an electric energy router according to embodiment 2 of the present invention;
fig. 3 is a schematic circuit diagram of a feed-in protection module according to embodiment 3 of the present invention;
fig. 4 is a schematic circuit diagram of a feed-out breaker module according to embodiment 4 of the present invention;
fig. 5 is a schematic circuit diagram of an electrolytic aluminum busbar protection module provided in embodiment 5 of the present invention;
icon: d1-first diode, D2-second diode, D3-third diode, D4-fourth diode, D5-fifth diode, KM 1-first contactor, KM 2-second contactor, KM 3-third contactor, KM 4-fourth contactor, QS 1-first isolating switch, QS 2-second isolating switch, QS 3-third isolating switch, QS 4-fourth isolating switch, QS 5-fifth isolating switch, QS 6-sixth isolating switch, SSCB-solid state circuit breaker, FU 1-first fuse, FU 2-second fuse.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which a product of the application is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, a power supply device for a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus comprises a plurality of photovoltaic strings, 8 photovoltaic combiner boxes, 4 electric energy router PET modules, 4 feed-in protection modules, 2 feed-out breaker modules and 2 electrolytic aluminum bus protection modules;
and the multiple paths of photovoltaic strings are connected into the photovoltaic combiner box in a summarizing way. The output ends of every two photovoltaic combiner boxes are commonly connected to the input end of an electric energy router PET module;
the output end of each PET module of the electric energy router is respectively connected to the input end of a feed-in protection module;
the output ends of every two feed-in protection modules are commonly connected to the input end of one feed-out breaker module;
the output end of each feed-out breaker module is connected to the input end of one electrolytic aluminum bus protection module through one bridge aluminum row respectively;
the output end of the electrolytic aluminum bus protection module is directly connected to the electrolytic cell bus.
It is specifically noted that direct current is used herein, and the input and output terminals of all the modules include positive and negative poles, which are connected to each other according to conventional operations during wiring, for example, the positive output terminal and the negative output terminal of the PET module of the electric energy router are connected to the positive input terminal and the negative input terminal of the feed-in protection module, respectively, and so on.
In the module, the photovoltaic combiner box is used for carrying out parallel connection collection on multiple paths of photovoltaic strings; the PET module of the electric energy router is used for carrying out maximum power point tracking, isolation transformation, output voltage following, output current regulation and automatic protection on energy from photovoltaic; the feed-in protection module is used for collecting, backstop protecting and overhauling isolating the output of the PET module of the electric energy router; the feed-out breaker module is used for conducting microsecond protection breaking and overhaul isolation on the output short-circuit fault; the electrolytic aluminum bus protection module is used for detecting short-circuit current and ensuring the safety of maintenance personnel.
In this embodiment, the number of paths of the photovoltaic strings that merge into each of the photovoltaic junction boxes is 18.
The specific implementation method comprises the following steps: using roof approximately 23808m2, 2.04048MWp distributed photovoltaic was built with a total number of photovoltaic modules of 3744. Monocrystalline silicon 545Wp solar panels are selected for arrangement, and are divided into two groups of 1.02MWp photovoltaic installation machines, and are used as direct current systems to be connected into the aluminum electrolysis cell. Each group of roof photovoltaics is connected in series according to the 26 blocks 545 components of each group, the photovoltaic outgoing lines are laid to the prefabricated cabin of the container of the direct current power router cabinet in a wiring mode of 72 strings of 1MW, and MC4 connectors are installed on the 72 groups of the roof photovoltaics. Wherein 4 photovoltaic combiner boxes are used for 1MW, and each photovoltaic combiner box is provided with 18 paths of photovoltaic strings, and thus, a total of 72 photovoltaic strings can be achieved.
The direct-current micro-grid is built, a stable flexible medium-voltage direct-current micro-grid technology is adopted, the direct-current micro-grid is completely isolated from an alternating-current power grid, the auxiliary power supply is self-powered, and the full-green power generation property is achieved. The direct-current micro-grid directly connects electric energy generated by the photovoltaic cell panel to an electrolytic aluminum direct-current bus after high-efficiency direct-current conversion and a protection switch, so that direct energy supply of photovoltaic power generation is realized. Compared with the traditional technology, the stable flexible medium-voltage direct-current micro-grid technology has the characteristics of high energy efficiency, high reliability, good transient stability, isolated grid operation, good electric energy quality, no voltage flicker in fault ride-through, good economy and the like.
In summary, the photovoltaic combiner box of the embodiment performs access of summarizing and transmitting 18 paths of photovoltaic strings;
then, direct current of the photovoltaic combiner box enters an electric energy router PET module, so that the maximum power tracking and energy conversion functions of the photovoltaic panel are realized;
then, direct current of the PET module of the electric energy router flows into the feed-in protection module and the feed-out breaker module in sequence, and the functions of energy output collection, line short circuit and overhaul isolation are realized through the feed-in protection module; the feed-out breaker module realizes microsecond level cutting of output short circuit of the direct current micro-grid system;
and finally, direct current is directly connected to the electrolytic aluminum direct current bus through the bridge aluminum row and the electrolytic aluminum bus protection module, so that direct energy supply of photovoltaic power generation is realized.
In summary, the core idea of the embodiment is to directly connect the multi-path photovoltaic strings to the direct current bus of the aluminum electrolysis cell after the subsequent circuit design, so as to realize direct supply of direct current to the aluminum electrolysis cell by photovoltaic power generation, and based on the characteristics, the embodiment can greatly improve the duty ratio of renewable energy sources, namely photovoltaic power, in the production electricity consumption of the electrolytic aluminum and also improve the in-situ digestion capacity of the photovoltaic power generation;
on the other hand, under the design of 4 electric energy router PET modules, 4 feed-in protection modules, 2 feed-out breaker modules and 2 electrolytic aluminum bus protection modules, the controllable links and the controllable nodes are more, the control speed is high, the control function is rich, and compared with the traditional power grid, the voltage and power control capability is greatly improved;
in addition, because direct current power supply is directly realized through photovoltaics, the direct current circuit has no problems of stable frequency, reactive power and the like, the power supply reliability can be improved through flexible system topology by adopting a multi-bus redundancy or closed loop technology, and the advantages of high response speed and short recovery time are achieved;
secondly, the embodiment can realize larger power supply capacity through the combination of a plurality of groups of photovoltaic strings, can greatly improve the conveying capacity, has stable power supply, and reduces the problems of energy loss and electric energy quality caused by multiple times of current conversion;
finally, based on the characteristic of direct current power supply of photovoltaic, the direct current is direct current, so that voltage phase and system frequency are not needed to be considered, only direct current bus voltage, current and system power are needed to be concerned, control factors are fewer, and further the control system has higher reliability and controllability.
For the scheme of the invention, verification is performed from the following angles respectively:
(1) Developing a 300kW direct current power router direct current access test to verify: the photovoltaic connection electrolytic aluminum test adopts 32 groups of wires to be connected into 300kW (isolated DC/DC converter) through MC4 connectors, and the wires are connected into the electrolytic tank direct current aluminum busbar through a direct current cable, and the output voltage follows the electrolytic tank direct current bus voltage. In a 300kW direct current access operation test, a 32-way photovoltaic string is connected into a 300kW direct current electric energy router through a photovoltaic intelligent direct current collecting box, the output side of the 32-way photovoltaic string is protected by a diode anti-backflow protection circuit, a direct current fuse and a direct current breaker and then is connected into a bridge type direct current aluminum row, and then is connected into a 300kA aluminum electrolysis cell busbar through a busbar direct current isolating switch cabinet provided with the diode anti-backflow protection circuit, the direct current fuse and the direct current isolating switch to form a photovoltaic electrolytic aluminum direct current micro-grid, a photovoltaic module generates electricity, and the output side is connected into an electrolytic aluminum direct current busbar for generating electricity. The test at the stage explores and verifies the feasibility and reliability of the distributed photovoltaic direct current access to the electrolytic aluminum direct current bus, and relevant test data are collected;
(2) And carrying out 2X 1MW direct current access test verification: 2 sub-arrays are formed by 2 1MW direct current electric energy routers (isolated DC-DC transformers), each photovoltaic power generation sub-array is connected with 2 1MW direct current electric energy routers through a photovoltaic intelligent direct current collecting box, then connected with an electrolytic tank through a direct current cable, and a direct current aluminum row adopts 2 sets of 1MW direct current electric energy routers (formed by an isolated DC/DC conversion device and a direct current micro-grid protection and control system) to form a photovoltaic electrolytic aluminum direct current micro-grid, and the photovoltaic power generation sub-array generates power by a photovoltaic component, and an output side direct current is connected with an electrolytic aluminum direct current bus for power generation. The aim of the stage is to further explore and verify the key technology of MW-level direct current micro-grid applied to an electrolytic aluminum direct current system, and verify the technical feasibility of high-capacity distributed photovoltaic direct current access aluminum electrolysis cell for directly supplying power to electrolytic aluminum;
(3) Carrying out 15MW direct current access test verification: the 15MW direct-current micro-grid system is planned and built in the stage, power is supplied by the distributed photovoltaic module, and power is supplied by the direct-current bus of the aluminum electrolysis cell through the direct-current power router. The stage is to verify that the technology can be popularized and applied and realize the ultimate goal of large-scale industrialization of the photovoltaic and electrolytic aluminum direct-current micro-grid.
Example 2
The embodiment is based on the technical solution of embodiment 1, and further describes an electric energy router PET module.
In this embodiment, referring to fig. 2, the power router PET module includes a precharge module, an isolated DC/DC module, and a filter module that are sequentially connected;
the positive electrode input end and the negative electrode input end of the pre-charging module are respectively the positive electrode input end and the negative electrode input end of the PET module of the electric energy router, and the positive electrode output end and the negative electrode output end of the filtering module are respectively the positive electrode output end and the negative electrode output end of the PET module of the electric energy router;
the pre-charging module is used for limiting current when starting;
the isolation type DC/DC module is used for electrically isolating the input side and the output side of the PET module of the electric energy router;
the filtering module is used for filtering and noise reduction.
Further, the filtering module comprises a reactance, a capacitance and a first EMI filter which are sequentially connected in parallel between a positive electrode line and a negative electrode line of the PET module of the electric energy router;
the reactance and the capacitor are used for filtering the current output by the PET module of the electric energy router, and the first EMI filter is used for blocking high-frequency current between the PET module of the electric energy router and external equipment;
the positive electrode output end and the negative electrode output end of the first EMI filter are respectively the positive electrode output end and the negative electrode output end of the PET module of the electric energy router.
Example 3
The present embodiment further describes the feed-in protection module based on the technical scheme of embodiment 1.
Referring to fig. 3, the feed-in protection module of the present embodiment includes a first diode D1, a plurality of contactors, and a plurality of isolation switches;
the first diode D1, the first contactor KM1 and the first isolating switch QS1 are sequentially connected in series on a positive line of the feed-in protection module;
the second contactor KM2 and the second isolating switch QS2 are sequentially connected in series on a negative line of the feed-in protection module;
the first disconnecting switch QS1 and the second disconnecting switch QS2 are controlled by a knife switch in a linkage mode.
The embodiment is used for protecting the direct current flowing into the direct current bus of the equipment, and is equivalent to the operation that the knife switch of one switch can carry out linkage control on two isolating switches to realize the simultaneous switching of the positive electrode and the negative electrode.
Example 4
The present embodiment is based on the technical solution of embodiment 1, and further description is given of the feed-out breaker module.
As a preferred solution, referring to fig. 4, the feed-out breaker module includes a plurality of contactors, a plurality of disconnectors, a solid state circuit breaker SSCB and a first lightning arrester;
the third disconnecting switch QS3, the third contactor KM3 and the solid-state circuit breaker SSCB are sequentially connected in series on a positive pole line of the feed-out circuit breaker module;
the fourth isolating switch QS4 and the fourth contactor KM4 are sequentially connected in series on a negative pole circuit of the feed-out breaker module;
the output end of the solid-state circuit breaker SSCB is connected with the positive electrode of the first lightning arrester, the fourth contactor KM4 is connected to the negative electrode of the first lightning arrester, and the positive electrode output end and the negative electrode output end of the first lightning arrester are respectively the positive electrode output end and the negative electrode output end of the feed-out circuit breaker module;
the third disconnecting switch QS3 and the fourth disconnecting switch QS4 are controlled by a knife switch in a linkage mode.
The solid-state circuit breaker SSCB is responsible for short-circuit protection, the two contactors are responsible for automatic electric isolation, the two isolating switches are responsible for realizing manual overhaul isolation, and the two isolating switches can be controlled in a linkage way by the disconnecting link of one switch, so that the operation of the positive electrode and the negative electrode simultaneously is realized.
Example 5
The present embodiment further describes an electrolytic aluminum busbar protection module based on the technical scheme of embodiment 1.
As a preferred scheme of the embodiment, referring to fig. 5, the electrolytic aluminum busbar protection module includes a second lightning arrester, a second EMI filter, a residual current detection module, a plurality of check valve groups, a plurality of fuses and a plurality of isolating switches; the positive electrode input end and the negative electrode input end of the second lightning arrester are the positive electrode input end and the negative input and output end of the electrolytic aluminum bus protection module;
the positive electrode output end of the second lightning arrester is connected to the input end of the second EMI filter, the output end of the second EMI filter is connected to the positive electrode input end of the residual current detection module, the positive electrode output end of the residual current detection module is connected to the input end of the first check valve group, the output end of the first check valve group is connected to one end of the first fuse FU1, and the other end of the first fuse FU1 is connected to one end of the fifth isolating switch QS 5;
the negative electrode output end of the second lightning arrester is connected with the negative electrode input end of the residual current detection module, the negative electrode output end of the residual current detection module is connected to the input end of the second check valve group, the output end of the second check valve group is connected to one end of the second fuse FU2, and the other end of the second fuse FU2 is connected with one end of the sixth isolating switch QS 6;
the other end of the fifth isolating switch QS5 and the other end of the sixth isolating switch QS6 are respectively an anode output end and a cathode output end of the electrolytic aluminum bus protection module.
Further, the first check valve group includes two diodes, an anode of the second diode D2 is connected to an anode output end of the residual current detection module, a cathode of the second diode D2 is connected to an anode of the third diode D3, and a cathode of the third diode D3 is connected to one end of the first fuse FU 1.
In addition, the second check valve group comprises two diodes, the cathode of the fourth diode D4 is connected to the negative output end of the residual current detection module, the anode of the fourth diode D4 is connected to the cathode of the fifth diode D5, and the anode of the fifth diode D5 is connected to one end of the second fuse FU 2.
The second EMI filter is used for blocking high-frequency current between the direct-current micro-grid and the electrolytic aluminum bus, the check valve group and the fuse are used for protecting short circuits between the bridge aluminum row and the direct-current micro-grid, and the residual current detection module is used for detecting and protecting ground faults.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A power supply device of a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus is characterized in that: the photovoltaic power generation system comprises a plurality of photovoltaic strings, 8 photovoltaic combiner boxes, 4 electric energy router PET modules, 4 feed-in protection modules, 2 feed-out circuit breaker modules and 2 electrolytic aluminum bus protection modules;
the multi-path photovoltaic strings are connected into the photovoltaic confluence boxes in a summarizing way, and the output ends of every two photovoltaic confluence boxes are connected to the input end of an electric energy router PET module together;
the output end of each PET module of the electric energy router is respectively connected to the input end of a feed-in protection module;
the output ends of every two feed-in protection modules are commonly connected to the input end of one feed-out breaker module;
the output end of each feed-out breaker module is connected to the input end of one electrolytic aluminum bus protection module through one bridge aluminum row respectively;
the output end of the electrolytic aluminum bus protection module is directly connected to the electrolytic cell bus;
the feed-out breaker module comprises a plurality of contactors, a plurality of disconnectors, a solid-state breaker and a first lightning arrester;
the third isolating switch, the third contactor and the solid-state circuit breaker are sequentially connected in series on a positive pole line of the feed-out circuit breaker module;
the fourth isolating switch and the fourth contactor are sequentially connected in series on the negative pole circuit of the feed-out breaker module;
the output end of the solid-state circuit breaker is connected with the positive electrode of the first lightning arrester, the fourth contactor is connected with the negative electrode of the first lightning arrester, and the positive electrode output end and the negative electrode output end of the first lightning arrester are respectively the positive electrode output end and the negative electrode output end of the feed-out circuit breaker module;
the third isolating switch and the fourth isolating switch are controlled by a disconnecting link in a linkage way;
the electrolytic aluminum bus protection module comprises a second lightning arrester, a second EMI filter, a residual current detection module, a plurality of check valve groups, a plurality of fuses and a plurality of isolating switches; the positive electrode input end and the negative electrode input end of the second lightning arrester are the positive electrode input end and the negative input and output end of the electrolytic aluminum bus protection module;
the positive electrode output end of the second lightning arrester is connected to the input end of the second EMI filter, the output end of the second EMI filter is connected to the positive electrode input end of the residual current detection module, the positive electrode output end of the residual current detection module is connected to the input end of the first check valve group, the output end of the first check valve group is connected to one end of the first fuse, and the other end of the first fuse is connected to one end of the fifth isolating switch;
the negative electrode output end of the second lightning arrester is connected with the negative electrode input end of the residual current detection module, the negative electrode output end of the residual current detection module is connected to the input end of the second check valve group, the output end of the second check valve group is connected to one end of the second fuse, and the other end of the second fuse is connected with one end of the sixth isolating switch;
the other end of the fifth isolating switch and the other end of the sixth isolating switch are respectively an anode output end and a cathode output end of the electrolytic aluminum bus protection module.
2. The power supply device for the direct current bus of the distributed photovoltaic direct current access aluminum electrolysis cell according to claim 1, wherein the power supply device comprises the following components: the number of the photovoltaic strings converged in each photovoltaic combiner box is 18.
3. The power supply device for the direct current bus of the distributed photovoltaic direct current access aluminum electrolysis cell according to claim 1, wherein the power supply device comprises the following components: the PET module of the electric energy router comprises a pre-charging module, an isolated DC/DC module and a filtering module which are sequentially connected;
the positive electrode input end and the negative electrode input end of the pre-charging module are respectively the positive electrode input end and the negative electrode input end of the PET module of the electric energy router, and the positive electrode output end and the negative electrode output end of the filtering module are respectively the positive electrode output end and the negative electrode output end of the PET module of the electric energy router;
the pre-charging module is used for limiting current when starting;
the isolation type DC/DC module is used for electrically isolating the input side and the output side of the PET module of the electric energy router;
the filtering module is used for filtering and noise reduction.
4. A power supply device for a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 3, wherein: the filtering module comprises a reactance, a capacitor and a first EMI filter which are sequentially connected in parallel between a positive electrode line and a negative electrode line of the PET module of the electric energy router;
the reactance and the capacitor are used for filtering the current output by the PET module of the electric energy router, and the first EMI filter is used for blocking high-frequency current between the PET module of the electric energy router and external equipment;
the positive electrode output end and the negative electrode output end of the first EMI filter are respectively the positive electrode output end and the negative electrode output end of the PET module of the electric energy router.
5. The power supply device for the direct current bus of the distributed photovoltaic direct current access aluminum electrolysis cell according to claim 1, wherein the power supply device comprises the following components: the feed-in protection module comprises a first diode, a plurality of contactors and a plurality of isolating switches;
the first diode, the first contactor and the first isolating switch are sequentially connected in series on a positive line of the feed-in protection module;
the second contactor and the second isolating switch are sequentially connected in series on a negative line of the feed-in protection module;
the first isolating switch and the second isolating switch are controlled by a knife switch in a linkage way.
6. The power supply device for the direct current bus of the distributed photovoltaic direct current access aluminum electrolysis cell according to claim 1, wherein the power supply device comprises the following components: the first check valve group comprises two diodes, the anode of the second diode is connected with the positive output end of the residual current detection module, the cathode of the second diode is connected with the anode of the third diode, and the cathode of the third diode is connected with one end of the first fuse.
7. The power supply device for the direct current bus of the distributed photovoltaic direct current access aluminum electrolysis cell according to claim 6, wherein the power supply device comprises the following components: the second check valve group comprises two diodes, the cathode of a fourth diode is connected with the negative output end of the residual current detection module, the anode of the fourth diode is connected with the cathode of a fifth diode, and the anode of the fifth diode is connected with one end of the second fuse.
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