CN115864355A - Power supply device for distributed photovoltaic direct current access aluminum electrolysis cell direct current bus - Google Patents
Power supply device for distributed photovoltaic direct current access aluminum electrolysis cell direct current bus Download PDFInfo
- Publication number
- CN115864355A CN115864355A CN202310123987.5A CN202310123987A CN115864355A CN 115864355 A CN115864355 A CN 115864355A CN 202310123987 A CN202310123987 A CN 202310123987A CN 115864355 A CN115864355 A CN 115864355A
- Authority
- CN
- China
- Prior art keywords
- module
- direct current
- output end
- feed
- photovoltaic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 91
- 238000005868 electrolysis reaction Methods 0.000 title claims description 24
- 238000002600 positron emission tomography Methods 0.000 claims description 44
- 238000001514 detection method Methods 0.000 claims description 22
- 238000001914 filtration Methods 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000010248 power generation Methods 0.000 abstract description 13
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 12
- 238000002955 isolation Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000012795 verification Methods 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 230000000151 anti-reflux effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/16—Regulation of the charging current or voltage by variation of field
- H02J7/22—Regulation of the charging current or voltage by variation of field due to variation of make-to-break ratio of intermittently-operating contacts, e.g. using Tirrill regulator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/16—Regulation of the charging current or voltage by variation of field
- H02J7/26—Regulation of the charging current or voltage by variation of field using magnetic devices with controllable degree of saturation
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a power supply device for a distributed photovoltaic direct current access aluminum electrolytic cell direct current bus, which relates to the technical field of power supply of aluminum electrolytic cells and aims to realize direct current supply to the aluminum electrolytic 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 multiple photovoltaic strings are connected into photovoltaic combiner boxes in a gathering mode, and every two photovoltaic combiner boxes are connected to one electric energy router PET module; each PET module of the electric energy router is respectively connected to a feed-in protection module; each two feed-in protection modules are connected to one feed-out breaker module; the two feed-out circuit breaker modules are respectively connected to an electrolytic aluminum bus protection module through a bridge frame aluminum row; the electrolytic aluminum busbar protection module is directly connected to the electrolyzer busbar. The photovoltaic direct power supply system has the advantages of direct photovoltaic power supply and low stable energy consumption.
Description
Technical Field
The invention relates to the technical field of power supply of aluminum electrolysis cells, 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 high energy consumption industry and is also a key industry of carbon emission.
Aiming at the development demand of low-carbon transformation on new energy in the high-energy-consumption electrolytic aluminum industry, an innovative method is urgently needed to improve the utilization level of renewable energy and the energy efficiency level in the electrolytic aluminum industry, so that transformation and upgrading of the electrolytic aluminum industry are accelerated, and green low-carbon development is realized. About 95% of production electricity of an electrolytic aluminum enterprise consumes direct current in aluminum smelting, the part of auxiliary production electricity consumption is only about 5%, and at present, domestic electrolytic aluminum enterprises establish a grid-connected distributed photovoltaic power generation access system, photovoltaic direct current is inverted into alternating current and is connected into a 380V low-voltage or 10kV high-voltage power distribution system, and how to directly supply the photovoltaic direct current to aluminum smelting production without power frequency inversion is an innovative application technology which has no significance. The existing design of the distributed photovoltaic power station access system of the electrolytic aluminum enterprise mainly adopts the traditional access mode that photovoltaic direct current is connected to a 380V low-voltage distribution system or a 10kV high-voltage distribution system in a grid-connected mode after being inverted into alternating current.
If the innovative application technology of directly accessing the distributed photovoltaic direct current to the direct current bus of the aluminum electrolysis cell through innovative research, development and experimental application, namely directly supplying the direct current to the aluminum electrolysis cell by photovoltaic power generation, the innovative application technology is based on a photovoltaic and electrolytic aluminum direct current micro-grid, the direct power supply to the aluminum electrolysis cell by the photovoltaic power generation is realized, the electric energy loss in the inversion-rectification process is reduced, high-capacity photovoltaic electric energy can be directly supplied to the electrolytic aluminum production without being limited by a conventional access auxiliary production power system, the occupation ratio of renewable energy in the electrolytic aluminum production power utilization is greatly improved, and the local consumption 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 electrolytic cell direct current bus, and aims to realize direct current supply to an aluminum electrolytic cell by photovoltaic power generation.
The embodiment of the invention is realized by the following technical scheme:
a power supply device for a distributed photovoltaic direct current access aluminum electrolytic 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 circuit breaker modules and 2 electrolytic aluminum bus protection modules;
the multiple photovoltaic strings are connected into the photovoltaic combiner boxes in a gathering mode, and the output ends of every two photovoltaic combiner boxes are connected to the input end of a PET (positron emission tomography) module of an electric energy router together;
the output end of each electric energy router PET module is respectively connected to the input end of a feed-in protection module;
the output ends of every two feed-in protection modules are connected to the input end of a 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 a bridge aluminum row;
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 converged into each photovoltaic combiner box is 18.
Preferably, the electric energy router PET module comprises a pre-charging module, an isolated DC/DC module and a filtering module which are connected in sequence;
the positive input end and the negative input end of the pre-charging module are respectively a positive input end and a negative input end of the PET module of the electric energy router, and the positive output end and the negative output end of the filtering module are respectively a positive output end and a negative output end of the PET module of the electric energy router;
the pre-charging module is used for limiting current at the time of starting;
the isolated 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 denoising.
Preferably, the filtering module comprises a reactance, a capacitor and a first EMI filter which are connected in parallel between a positive line and a negative line of the PET module of the electric energy router in sequence;
the reactance and the capacitor are used for filtering current output by the electric energy router PET module, and the first EMI filter is used for blocking high-frequency current between the electric energy router PET module and external equipment;
and the positive output end and the negative output end of the first EMI filter are respectively the positive output end and the negative 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 the positive line of the feed-in protection module;
the second contactor and the second isolating switch are sequentially connected in series on a negative pole circuit of the feed-in protection module;
the first isolating switch and the second isolating switch are controlled by a knife switch in a linkage mode.
Preferably, the feed-out breaker module comprises a plurality of contactors, a plurality of disconnectors, a solid state breaker and a first arrester;
the third isolating switch, the third contactor and the solid-state circuit breaker are sequentially connected in series on a positive line of the feed-out circuit breaker module;
a fourth isolating switch and a fourth contactor 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 is connected with the anode of the first arrester, the fourth contactor is connected with the cathode of the first arrester, and the anode output end and the cathode output end of the first arrester are respectively the anode output end and the cathode 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 mode.
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 banks, a plurality of fuses and a plurality of isolating switches; the positive input end and the negative input end of the second lightning arrester are the positive input end and the negative output end of the electrolytic aluminum bus protection module;
the positive output end of the second arrester is connected to the input end of the second EMI filter, the output end of the second EMI filter is connected with the positive input end of the residual current detection module, the positive 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 output end of the second lightning arrester is connected with the negative input end of the residual current detection module, the negative output end of the residual current detection module is connected with 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 a positive output end and a negative output end of the electrolytic aluminum bus protection module.
Preferably, the first check valve group comprises two diodes, the anode of the second diode is connected with the anode 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.
Preferably, the second check valve group comprises two diodes, a cathode of a fourth diode is connected with a cathode output end of the residual current detection module, an anode of the fourth diode is connected with a cathode of a fifth diode, and an anode of the fifth diode is connected with one end of the second fuse.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
the invention greatly improves the proportion of renewable energy in the electricity consumption in the electrolytic aluminum production and improves the on-site consumption 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;
according to the invention, through direct current power supply, the direct current line has no problems of stable frequency, reactive power and the like, the power supply reliability can be improved through flexible system topology by adopting multi-bus redundancy or closed-loop technology, and the advantages of high response speed and short recovery time are achieved;
the power supply capacity supported by the invention is large, the transmission capacity can be greatly improved, the power supply is stable, and the energy loss and the power quality problems caused by multiple current conversions are reduced;
the direct-current micro-grid system only needs to pay attention to direct-current bus voltage, current and system power without considering voltage phase and system frequency, 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 needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic circuit diagram of a power supply device for a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus provided in embodiment 1 of the present invention;
fig. 2 is a schematic circuit diagram of a PET module of an electric energy router provided in embodiment 2 of the present invention;
fig. 3 is a schematic circuit diagram of a feeding protection module according to embodiment 3 of the present invention;
fig. 4 is a schematic circuit diagram of a feed-out circuit breaker module according to embodiment 4 of the present invention;
FIG. 5 is a schematic circuit diagram of an electrolytic aluminum bus bar protection module provided in example 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 disconnector, QS 2-second disconnector, QS 3-third disconnector, QS 4-fourth disconnector, QS 5-fifth disconnector, QS 6-sixth disconnector, SSCB-solid state breaker, FU 1-first fuse, FU 2-second fuse.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent 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 orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of this application is used, the description is merely for convenience and simplicity of description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, a power supply device for a distributed photovoltaic direct current access aluminum electrolytic 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 multi-channel photovoltaic strings are gathered and connected into the photovoltaic combiner box. The output ends of every two photovoltaic combiner boxes are connected to the input end of a PET (positron emission tomography) module of an electric energy router together;
the output end of each electric energy router PET module is respectively connected to the input end of a feed-in protection module;
the output ends of every two feed-in protection modules are connected to the input end of a 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 a bridge aluminum row;
the output end of the electrolytic aluminum bus protection module is directly connected to the electrolytic cell bus.
Specifically, the direct current is used, the input ends and the output ends of all modules include positive electrodes and negative electrodes, and the positive electrodes are connected with the negative electrodes and the negative electrodes according to the conventional operation during wiring, for example, the positive electrode output end and the negative electrode output end of the PET module of the electric energy router are respectively connected to the positive electrode input end and the negative electrode input end of the feeding protection module, and so on.
In the above modules, the photovoltaic combiner box is used for parallel connection and collection of multiple photovoltaic strings; the electric energy router PET module 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, non-return protecting and overhauling and isolating the output of the PET module of the electric energy router; the feed-out breaker module is used for carrying out microsecond-level protection breaking and maintenance 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 maintainers.
In this embodiment, the number of the photovoltaic strings converged into each of the photovoltaic combiner boxes is 18.
The specific implementation method comprises the following steps: the roof is utilized to build 2.04048MWp distributed photovoltaic, and the total number of photovoltaic modules is 3744. Monocrystalline silicon 545Wp solar cell panels are selected for arrangement, are divided into two groups of 1.02MWp photovoltaic installation machines, and are used as a direct current system to be connected into an aluminum electrolysis cell. And each group of roof photovoltaic is connected in series by 26 and 545 components in each group string, photovoltaic outgoing lines are laid to the prefabricated cabin of the direct current electric energy router cabinet container in a 1 MW-72-string connection mode, and MC4 connectors are installed on 72 groups of connection lines. Wherein 1MW uses 4 photovoltaic conflux case, and 18 photovoltaic strings of every photovoltaic conflux case, and then can reach 72 photovoltaic strings totally.
The direct current microgrid is built in the embodiment, a stable flexible medium-voltage direct current microgrid technology is adopted, the microgrid is completely isolated from an alternating current power grid, an auxiliary power supply is self-supplied, and the full-green power generation attribute is realized. The direct current micro-grid directly connects the electric energy generated by the photovoltaic cell panel to the electrolytic aluminum direct current bus after passing through the high-efficiency direct current conversion and the protection switch, so that the 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 accesses the 18 photovoltaic strings for summary transmission;
then, the direct current of the photovoltaic combiner box enters an electric energy router PET module, and the maximum power tracking and energy conversion functions of the photovoltaic panel are realized;
then the direct current of the PET module of the electric energy router sequentially flows into the feed-in protection module and the feed-out breaker module, and the functions of energy output collection, line short circuit and maintenance isolation are realized through the feed-in protection module; the feed-out circuit breaker module realizes microsecond-level cut-off of output short circuit of the direct-current microgrid system;
and finally, the 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 the direct energy supply of photovoltaic power generation is realized.
In summary, the core idea of this embodiment is to directly access the direct current bus of the aluminum electrolysis cell after the subsequent circuit design through the multiple photovoltaic strings, so as to realize direct current supply from photovoltaic power generation to the aluminum electrolysis cell, and based on this feature, this embodiment can greatly improve the percentage of renewable energy, i.e., photovoltaic power, in the electricity consumption in the electrolytic aluminum production, and also improve the local consumption capability of 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 controllable nodes are more, the control speed is high, the control functions are rich, and compared with the traditional power grid, the control capability of voltage and power is greatly improved;
in addition, direct current power supply is directly realized through photovoltaic, so that the direct current line has no problems of frequency stability, reactive power and the like, the power supply reliability can be improved through flexible system topology by adopting 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 transmission capacity, has stable power supply, and reduces the energy loss and the power quality problems caused by multiple conversions;
finally, the direct photovoltaic direct current power supply is based on the characteristic that the direct photovoltaic direct current power supply is based on direct current, voltage phase and system frequency do not need to be considered, only direct current bus voltage, direct current and system power need to be concerned, control factors are fewer, and therefore the direct current power supply 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 electric energy router direct current access test verification: namely, in the photovoltaic access electrolytic aluminum test, 32 groups of connecting wires are connected into a 300kW (isolated DC/DC converter) through MC4 connectors, and are connected into a direct current aluminum bar of an electrolytic cell through a direct current cable, and the output voltage follows the direct current bus voltage of the electrolytic cell. In a 300kW direct current access commissioning test, 32 photovoltaic strings are connected into a 300kW direct current electric energy router through a photovoltaic intelligent direct current combiner box, the output side of the router is protected by a diode anti-reflux protection circuit, a direct current fuse and a direct current breaker and then connected into a bridge type direct current aluminum bar, and the router is connected into a 300kA aluminum electrolytic cell bus through a bus direct current isolation switch cabinet with the diode anti-reflux protection circuit, the direct current fuse and a direct current isolation switch to form a photovoltaic electrolytic aluminum direct current micro-grid, the photovoltaic module generates electricity, and the output side is connected into the electrolytic aluminum direct current bus to generate electricity. The test at this stage explores and verifies the feasibility and reliability of the distributed photovoltaic direct current access electrolytic aluminum direct current bus, and collects relevant test data;
(2) 2X 1MW direct current access test verification is carried out: adopt 2 1MW direct current electric energy routers (isolated DC-DC transformer) to constitute 2 subarrays, every photovoltaic power generation subarray passes through photovoltaic intelligence direct current collection flow box and inserts 2 1MW direct current electric energy routers, rethread direct current cable access electrolysis trough direct current aluminium row adopts 2 sets of 1MW direct current electric energy routers (comprises isolated DC/DC conversion device and direct current little electric network protection and control system), form photovoltaic electrolysis aluminium direct current little electric wire netting, generate electricity by photovoltaic module, output side direct current inserts electrolysis aluminium direct current generating line electricity generation. The aim of the stage is to further explore and verify the key technology of the MW-level direct-current micro-grid applied to the electrolytic aluminum direct-current system, and verify the technical feasibility of the high-capacity distributed photovoltaic direct-current access aluminum electrolysis cell for directly supplying power for electrolytic aluminum;
(3) Carrying out 15MW direct current access test verification: in the planning and construction of the stage, a 15MW direct-current micro-grid system is powered by distributed photovoltaic components and is connected with a direct-current bus of an aluminum electrolytic cell for power supply through a direct-current electric energy router. The final aim of the technology is to verify that the technology can be popularized and applied and realize the standardization and industrialization of a photovoltaic and electrolytic aluminum direct current micro-grid.
Example 2
The embodiment further describes the electric energy router PET module based on the technical solution of embodiment 1.
In this embodiment, referring to fig. 2, the PET module of the electric energy router includes a precharge module, an isolated DC/DC module, and a filtering module, which are connected in sequence;
the positive input end and the negative input end of the pre-charging module are respectively a positive input end and a negative input end of the PET module of the electric energy router, and the positive output end and the negative output end of the filtering module are respectively a positive output end and a negative output end of the PET module of the electric energy router;
the pre-charging module is used for limiting current at the time of starting;
the isolated 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 denoising.
Furthermore, the filtering module comprises a reactance, a capacitor and a first EMI filter which are sequentially connected in parallel between a positive circuit and a negative circuit of the PET module of the electric energy router;
the reactance and the capacitor are used for filtering current output by the electric energy router PET module, and the first EMI filter is used for blocking high-frequency current between the electric energy router PET module and external equipment;
and the positive output end and the negative output end of the first EMI filter are respectively the positive output end and the negative output end of the PET module of the electric energy router.
Example 3
The present embodiment further describes the feeding protection module based on the technical solution of embodiment 1.
Referring to fig. 3, the feeding protection module of the present embodiment includes a first diode D1, a plurality of contactors, and a plurality of isolation switches;
a first diode D1, a first contactor KM1 and a first isolating switch QS1 are sequentially connected in series on a positive pole line of the feed-in protection module;
the second contactor KM2 and a second isolating switch QS2 are sequentially connected in series on a negative pole line of the feed-in protection module;
the first isolating switch QS1 and the second isolating switch QS2 are controlled by a knife switch in a linkage mode.
The embodiment is used for protecting the direct current of equipment flowing into a direct current bus, and is equivalent to that two isolating switches can be controlled in a linkage manner by a disconnecting link of one switch, so that the operation of simultaneously switching the positive electrode and the negative electrode is realized.
Example 4
The present embodiment further describes a feed-out breaker module based on the technical solution of embodiment 1.
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 breaker SSCB, and a first arrester;
a third isolating switch QS3, a third contactor KM3 and a solid-state breaker SSCB are sequentially connected in series on a positive pole line of the feed-out breaker module;
a fourth isolating switch QS4 and a fourth contactor KM4 are sequentially connected in series on a negative pole line of the feed-out breaker module;
the output end of the solid-state circuit breaker SSCB is connected with the anode of the first lightning arrester, the fourth contactor KM4 is connected with the cathode of the first lightning arrester, and the anode output end and the cathode output end of the first lightning arrester are respectively the anode output end and the cathode 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 electrical isolation, the two isolating switches are responsible for realizing manual maintenance isolation, and the same disconnecting switch of one switch can be used for linkage control of the two isolating switches to realize simultaneous switching of the positive pole and the negative pole.
Example 5
This example further illustrates an electrolytic aluminum busbar protection module based on the technical solution of example 1.
Referring to fig. 5, the electrolytic aluminum bus protection module includes a second lightning arrester, a second EMI filter, a residual current detection module, a plurality of check valve banks, a plurality of fuses, and a plurality of isolation switches; the positive input end and the negative input end of the second lightning arrester are the positive input end and the negative input end of the electrolytic aluminum bus protection module;
the positive output end of the second arrester is connected to the input end of the second EMI filter, the output end of the second EMI filter is connected with the positive input end of the residual current detection module, the positive 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 a fifth isolating switch QS 5;
the negative output end of the second lightning arrester is connected with the negative input end of the residual current detection module, the negative output end of the residual current detection module is connected with 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 a 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 comprises two diodes, the anode of the second diode D2 is connected to the anode output end of the residual current detection module, the cathode of the second diode D2 is connected to the anode of the third diode D3, and the 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 with the negative output end of the residual current detection module, the anode of the fourth diode D4 is connected with the cathode of the fifth diode D5, and the anode of the fifth diode D5 is connected with 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 of the bridge aluminum busbar 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, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A power supply device for a distributed photovoltaic direct current access aluminum electrolysis cell direct current bus is characterized in that: the 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 multiple photovoltaic strings are connected into the photovoltaic combiner boxes in a gathering mode, and the output ends of every two photovoltaic combiner boxes are connected to the input end of a PET (positron emission tomography) module of an electric energy router together;
the output end of each electric energy router PET module is respectively connected to the input end of a feed-in protection module;
the output ends of every two feed-in protection modules are connected to the input end of a 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 a bridge aluminum row;
the output end of the electrolytic aluminum bus protection module is directly connected to the electrolytic cell bus.
2. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 1, characterized in that: the number of the photovoltaic strings which are converged into each photovoltaic combiner box is 18.
3. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 1, characterized in that: the electric energy router PET module comprises a pre-charging module, an isolated DC/DC module and a filtering module which are sequentially connected;
the positive input end and the negative input end of the pre-charging module are respectively a positive input end and a negative input end of the PET module of the electric energy router, and the positive output end and the negative output end of the filtering module are respectively a positive output end and a negative output end of the PET module of the electric energy router;
the pre-charging module is used for limiting current at the time of starting;
the isolated 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 denoising.
4. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 3, characterized in that: the filtering module comprises a reactance, a capacitor and a first EMI filter which are sequentially connected in parallel between a positive circuit and a negative circuit of the PET module of the electric energy router;
the reactance and the capacitor are used for filtering current output by the electric energy router PET module, and the first EMI filter is used for blocking high-frequency current between the electric energy router PET module and external equipment;
and the positive output end and the negative output end of the first EMI filter are respectively the positive output end and the negative output end of the PET module of the electric energy router.
5. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 1, characterized in that: 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 the positive line of the feed-in protection module;
the second contactor and the second isolating switch are sequentially connected in series on the negative pole circuit of the feed-in protection module;
the first isolating switch and the second isolating switch are controlled by a knife switch in a linkage mode.
6. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 1, characterized in that: the feed-out circuit breaker module comprises a plurality of contactors, a plurality of isolating switches, a solid-state circuit breaker and a first arrester;
the third isolating switch, the third contactor and the solid-state circuit breaker are sequentially connected in series on a positive line of the feed-out circuit breaker module;
a fourth isolating switch and a fourth contactor 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 is connected with the anode of the first arrester, the fourth contactor is connected with the cathode of the first arrester, and the anode output end and the cathode output end of the first arrester are respectively the anode output end and the cathode 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 mode.
7. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 1, characterized in that: 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 input end and the negative input end of the second lightning arrester are the positive input end and the negative input end of the electrolytic aluminum bus protection module;
the positive output end of the second arrester is connected to the input end of the second EMI filter, the output end of the second EMI filter is connected with the positive input end of the residual current detection module, the positive 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 output end of the second lightning arrester is connected with the negative input end of the residual current detection module, the negative output end of the residual current detection module is connected with 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 a positive output end and a negative output end of the electrolytic aluminum bus protection module.
8. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 7, characterized in that: the first check valve group comprises two diodes, the anode of the second diode is connected with the anode 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.
9. The power supply device of the distributed photovoltaic direct current access aluminum electrolysis cell direct current bus according to claim 8, characterized in that: the second check valve group comprises two diodes, the cathode of the fourth diode is connected with the cathode 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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310123987.5A CN115864355B (en) | 2023-02-16 | 2023-02-16 | Power supply device of distributed photovoltaic direct-current access aluminum electrolysis cell direct-current bus |
| PCT/CN2023/116647 WO2024169162A1 (en) | 2023-02-16 | 2023-09-04 | Power supply apparatus in which distributed photovoltaic direct current is connected to direct-current bus of aluminum electrolytic tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310123987.5A CN115864355B (en) | 2023-02-16 | 2023-02-16 | Power supply device of distributed photovoltaic direct-current access aluminum electrolysis cell direct-current bus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115864355A true CN115864355A (en) | 2023-03-28 |
| CN115864355B CN115864355B (en) | 2023-05-05 |
Family
ID=85658241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310123987.5A Active CN115864355B (en) | 2023-02-16 | 2023-02-16 | Power supply device of distributed photovoltaic direct-current access aluminum electrolysis cell direct-current bus |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115864355B (en) |
| WO (1) | WO2024169162A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024169162A1 (en) * | 2023-02-16 | 2024-08-22 | 云南铝业股份有限公司 | Power supply apparatus in which distributed photovoltaic direct current is connected to direct-current bus of aluminum electrolytic tank |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201918409U (en) * | 2011-01-01 | 2011-08-03 | 国网电力科学研究院 | Novel photovoltaic confluence box |
| CN204578458U (en) * | 2015-03-09 | 2015-08-19 | 南车株洲电力机车研究所有限公司 | A kind of header box circuit structure and photovoltaic generating system |
| DE202016005237U1 (en) * | 2016-08-26 | 2017-03-27 | Hilary Emanuel Weinberg | PV facade with heat recovery on new and old buildings |
| CN111342483A (en) * | 2018-12-18 | 2020-06-26 | 汉能移动能源控股集团有限公司 | Solar power generation system |
| CN114048970A (en) * | 2021-10-27 | 2022-02-15 | 云南电网有限责任公司 | Double-layer scheduling method and system considering participation of electrolytic aluminum load in power grid operation |
| CN216215926U (en) * | 2021-10-25 | 2022-04-05 | 天津新展高速公路有限公司 | Distributed photovoltaic power generation system |
| CN115441565A (en) * | 2022-09-13 | 2022-12-06 | 中国科学院电工研究所 | Electrolytic aluminum carbon emission reduction system with efficient new energy access |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356589A (en) * | 2015-11-04 | 2016-02-24 | 四川华索自动化信息工程有限公司 | Constant-current type multi-source DC transformer based on aluminum electrolytic bath |
| CN113462897A (en) * | 2019-04-30 | 2021-10-01 | 易航时代(北京)科技有限公司 | Production device and production method for aluminum and metallic silicon and control method of production device |
| CN114825488A (en) * | 2022-03-18 | 2022-07-29 | 沈阳铝镁设计研究院有限公司 | Method for applying distributed photovoltaic power generation to power supply rectification system of electrolytic aluminum plant |
| CN115864355B (en) * | 2023-02-16 | 2023-05-05 | 云南铝业股份有限公司 | Power supply device of distributed photovoltaic direct-current access aluminum electrolysis cell direct-current bus |
-
2023
- 2023-02-16 CN CN202310123987.5A patent/CN115864355B/en active Active
- 2023-09-04 WO PCT/CN2023/116647 patent/WO2024169162A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201918409U (en) * | 2011-01-01 | 2011-08-03 | 国网电力科学研究院 | Novel photovoltaic confluence box |
| CN204578458U (en) * | 2015-03-09 | 2015-08-19 | 南车株洲电力机车研究所有限公司 | A kind of header box circuit structure and photovoltaic generating system |
| DE202016005237U1 (en) * | 2016-08-26 | 2017-03-27 | Hilary Emanuel Weinberg | PV facade with heat recovery on new and old buildings |
| CN111342483A (en) * | 2018-12-18 | 2020-06-26 | 汉能移动能源控股集团有限公司 | Solar power generation system |
| CN216215926U (en) * | 2021-10-25 | 2022-04-05 | 天津新展高速公路有限公司 | Distributed photovoltaic power generation system |
| CN114048970A (en) * | 2021-10-27 | 2022-02-15 | 云南电网有限责任公司 | Double-layer scheduling method and system considering participation of electrolytic aluminum load in power grid operation |
| CN115441565A (en) * | 2022-09-13 | 2022-12-06 | 中国科学院电工研究所 | Electrolytic aluminum carbon emission reduction system with efficient new energy access |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024169162A1 (en) * | 2023-02-16 | 2024-08-22 | 云南铝业股份有限公司 | Power supply apparatus in which distributed photovoltaic direct current is connected to direct-current bus of aluminum electrolytic tank |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024169162A1 (en) | 2024-08-22 |
| CN115864355B (en) | 2023-05-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112398308B (en) | Multi-port energy router and control system and control method thereof | |
| CN111049270A (en) | Intelligent outdoor switch box and closed-loop I-shaped power distribution network thereof | |
| CN111987725A (en) | Flexible compensation system of distribution network | |
| CN105429177B (en) | A kind of Modular photovoltaic energy-storage system | |
| CN207010253U (en) | A kind of chain type multiport grid connection interface device | |
| CN105680476A (en) | Direct-current boost concentrated inversion photovoltaic power generation system | |
| WO2024169162A1 (en) | Power supply apparatus in which distributed photovoltaic direct current is connected to direct-current bus of aluminum electrolytic tank | |
| CN217720738U (en) | Permanent fault ride-through system for offshore flexible direct-current submarine cable | |
| CN115021307A (en) | New energy power station direct current collection networking system and method | |
| CN1776990A (en) | High-power wind power generation interconnection technology | |
| Zhao et al. | Summary and prospect of technology development of MVDC and LVDC distribution technology | |
| CN209982088U (en) | Primary topological structure of electrochemical energy storage system based on group-string PCS | |
| CN205304269U (en) | Direct current pressure increasing system of grid -connected PV electricity generation | |
| CN112421679A (en) | Electrical wiring structure based on hybrid micro-grid and energy flowing method thereof | |
| CN204103855U (en) | Tandem photovoltaic square formation | |
| CN208955660U (en) | Photovoltaic AC/DC system of transformer substation | |
| CN116231616A (en) | Distributed photovoltaic direct current access electrolytic aluminum power supply system | |
| CN116316565A (en) | Optimization method for light-storage-direct micro-grid system for substation | |
| CN115537834A (en) | New energy off-grid hydrogen production system and method | |
| CN211860009U (en) | Photovoltaic power generation system with isolated group string inverter | |
| CN111277002B (en) | Flexible excitation power unit parallel topology structure and control method thereof | |
| CN210074787U (en) | High-power converter circuit topological structure for offshore wind power | |
| CN113241786A (en) | Power grid access method of new energy system | |
| CN114172141B (en) | Series-type direct-current boosting and converging system and control method thereof | |
| CN218300951U (en) | Variable-power grid-connected control system of diesel generator set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |