CN113809774A - Photovoltaic power generation and power grid complementary direct current smelting furnace power supply system and method - Google Patents

Photovoltaic power generation and power grid complementary direct current smelting furnace power supply system and method Download PDF

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Publication number
CN113809774A
CN113809774A CN202111107831.5A CN202111107831A CN113809774A CN 113809774 A CN113809774 A CN 113809774A CN 202111107831 A CN202111107831 A CN 202111107831A CN 113809774 A CN113809774 A CN 113809774A
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China
Prior art keywords
power
smelting
power generation
furnace
photovoltaic
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CN202111107831.5A
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Chinese (zh)
Inventor
张豫川
龙海洋
杨宁川
黄其明
谈存真
熊涛
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CISDI Engineering Co Ltd
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CISDI Engineering Co Ltd
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Priority to CN202111107831.5A priority Critical patent/CN113809774A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/22The renewable source being solar energy
    • H02J2300/24The renewable source being solar energy of photovoltaic origin
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/20Climate change mitigation technologies for sector-wide applications using renewable energy

Abstract

The invention relates to a photovoltaic power generation and power grid complementary direct current smelting furnace power supply system and method, and belongs to the field of electromagnetic metallurgical equipment. The system comprises a photovoltaic power generation system, an electric furnace power supply system and an electric furnace smelting system, wherein the photovoltaic power generation system comprises a photovoltaic electric field and an energy storage system. The photovoltaic power generation system and the power grid are complementarily controlled to supply power to the electric furnace smelting system based on distributed optimal control, whether the output of the photovoltaic power generation system is matched with the power demand of the smelting furnace is judged by detecting the power generation state of the photovoltaic power generation system and the smelting power demand of the direct-current smelting furnace in real time, and then the switching state of the photovoltaic power generation system and the electric furnace power supply system is adjusted, so that the power demand of the electric furnace smelting system in normal operation is ensured. The photovoltaic power generation system improves the power supply quality of the photovoltaic power generation system, can realize large-scale local consumption of photovoltaic power generation energy, effectively solves the problems of market consumption, high power transmission cost and the like of photovoltaic power generation, and greatly reduces the power consumption cost of production enterprises.

Description

Photovoltaic power generation and power grid complementary direct current smelting furnace power supply system and method
Technical Field
The invention belongs to the technical field of boilers, and relates to a power supply system and method of a photovoltaic power generation and power grid complementary direct current smelting furnace.
Background
Photovoltaic power generation is an important way of utilizing solar energy, has the advantages of no exhaustion danger, safety, reliability, no noise, no pollution discharge, high energy quality, absolute cleanness (no public hazard), short construction period, short time for obtaining energy and the like, and has an important position in the long-term energy strategy of the country. However, for a long time, due to the reasons of insufficient market consumption, complex peak and frequency modulation technology, high power transmission cost and the like, photovoltaic power generation has a serious light abandoning and electricity limiting phenomenon in some places, the energy output by the photovoltaic power generation is not fully utilized, and a large amount of clean resources are wasted.
Disclosure of Invention
In view of the above, the present invention provides a system and a method for supplying power to a dc smelting furnace with complementary photovoltaic power generation and a power grid, in which energy output by a photovoltaic power generation system is preferentially used to supply power to an electric furnace smelting system, and when the generated energy of an optical system is insufficient, the electric furnace power supply system is used as a complementary energy source to meet the power consumption requirement of the electric arc furnace for smelting operation. The energy output by each unit of the photovoltaic power generation system is adjusted in real time according to the smelting power demand of the electric furnace, distributed optimal control of the photovoltaic power generation system is achieved, the power supply quality of the photovoltaic power generation system is improved, meanwhile, photovoltaic power generation energy can be consumed on site on a large scale, the problems of market consumption, high power transmission cost and the like of photovoltaic power generation are effectively solved, and the power consumption cost of production enterprises is greatly reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
a power supply system of a direct current smelting furnace with complementary photovoltaic power generation and a power grid comprises a photovoltaic power generation system, an electric furnace power supply system and an electric furnace smelting system;
the output of the photovoltaic power generation system is connected to a direct current bus of the electric furnace smelting system, the front stage of the electric furnace power supply system is connected with a power grid, and the rear stage of the electric furnace power supply system is connected to the direct current bus of the electric furnace smelting system;
through the electricity generation state of real-time detection photovoltaic power generation system and the smelting power demand of direct current smelting furnace, judge whether phase-match of photovoltaic power generation system's output and the power demand of smelting furnace, adjust photovoltaic power generation system and electric stove power supply system's switching state, preferentially supply power to the electric arc furnace through photovoltaic power generation system, when photovoltaic system generated energy is not enough, supply power to electric stove smelting system by electric stove power supply system additional electric quantity, guarantee the power demand of the normal operation of electric stove smelting system.
Optionally, the photovoltaic power generation system and the electric furnace power supply system respectively and independently supply power to the electric furnace smelting system, or simultaneously supply power to the electric furnace smelting system.
Optionally, the photovoltaic power generation system includes a photovoltaic electric field and a distributed DC/DC and energy storage system;
the electric energy that photovoltaic electric field distributed panel sent is connected to the busbar after the distributed DC/DC conversion, and the back level inserts energy storage system to insert the direct current bus through 1# switch, photovoltaic power generation system's capacity and the electric demand phase-match of electric arc furnace smelting operation.
Optionally, the energy storage system is composed of a charger, a battery system, a bidirectional DC/DC, and a super capacitor;
the charger is used as a connecting medium of the battery system and the photovoltaic power generation system, and controls whether the bus bar charges the battery system, and the battery system is a plurality of battery packs;
the bidirectional DC/DC control bus bar charges the super capacitor, and the super capacitor is controlled to release energy to the bus bar;
when the generated energy of the photovoltaic power generation system cannot meet the power demand of the direct current smelting furnace, the electric furnace power supply system is connected with a rectifier transformer by taking power from a power grid and then is connected to a direct current bus through three-phase AC/DC for power supply, and a #2 switch controls the electric furnace power supply system to be put into operation and cut off operation.
Optionally, the post-stage of the DC bus is connected to a DC/DC chopper, and then to a DC smelting furnace for smelting.
The power supply system of the direct current smelting furnace detects the power generation state of the photovoltaic power generation system and the smelting power demand of the direct current smelting furnace in real time;
when the bus bar meets the power consumption requirement of electric furnace smelting, the switch 1 is closed, the switch 2 is opened, and the voltage and current of the distributed DC/DC output are adjusted to transmit power to the DC bus bar according to the power consumption requirement of electric furnace smelting;
meanwhile, redundant energy of the bus bar is used for charging and storing energy to the super capacitor through the bidirectional DC/DC, and the bus bar is used for charging the battery system through the charger after the energy storage of the capacitor is completed.
Optionally, the power generation state of the photovoltaic power generation system and the smelting power demand of the direct current smelting furnace are detected in real time, when the bus bar does not meet the smelting power demand of the electric furnace, and the super capacitor stores energy, the bus bar and the electric arc furnace power supply system supply power simultaneously, the 1# switch and the 2# switch are both closed, the electric furnace power supply system is put into operation to supply power, the super capacitor releases energy to the bus bar through the bidirectional DC/DC, the output voltage of the distributed DC/DC and the super capacitor is adjusted to be consistent with the output voltage of the three-phase AC/DC, and the charger stops charging the battery system.
Optionally, the power generation state of the photovoltaic power generation system and the smelting power demand of the direct current smelting furnace are detected in real time, when the bus bar does not meet the smelting power demand of the electric furnace, after the energy of the super capacitor stored energy is released, the electric furnace power supply system only supplies power, the 1# switch is switched off, the 2# switch is switched on, the electric furnace power supply system is switched on to supply power, the bus bar utilizes the bidirectional DC/DC to charge and store the energy to the super capacitor, and after the capacitor stores the energy, the bus bar charges the battery system through the charger.
Optionally, when the electric furnace is in a working condition that electricity is not needed, such as blowing out or tapping, the 1# switch and the 2# switch are both switched off, the electric furnace power supply system stops supplying power to the electric furnace, the bus bar charges and stores energy to the super capacitor by using the bidirectional DC/DC, and the bus bar charges the battery system through the charger after the capacitor stores energy.
Optionally, the 1# switch and the 2# switch are both electronic switches and are composed of fully-controlled devices.
The invention has the beneficial effects that:
the electric furnace smelting system is powered by preferentially utilizing the energy output by the photovoltaic power generation system, the electric furnace power supply system is used as a complementary energy source to meet the electricity utilization requirement of smelting operation of the electric arc furnace, the distributed optimal control of the photovoltaic power generation system can be realized, the energy output by each unit of the photovoltaic power generation system is regulated in real time according to the electricity utilization requirement of the electric furnace smelting, the power supply quality of the photovoltaic power generation system is improved, meanwhile, the photovoltaic power generation energy can be consumed on site in a large scale, the problems of market consumption, high electricity transmission cost and the like of photovoltaic power generation are effectively solved, and the electricity utilization cost of production enterprises is greatly reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Fig. 1 is a power supply system of a direct current smelting furnace based on distributed optimal control photovoltaic power generation and power grid complementation, and fig. 2 is a flow chart of a power supply switching method based on distributed optimal control photovoltaic power generation and power grid complementation. The method comprises the following steps:
the utility model provides a photovoltaic power generation and complemental direct current smelting furnace power supply system of electric wire netting which characterized in that: the device comprises a photovoltaic power generation system, an electric furnace power supply system and an electric furnace smelting system. The output of the photovoltaic power generation system is connected to a direct current bus of the electric furnace smelting system, the front stage of the electric furnace power supply system is connected with a power grid, and the rear stage of the electric furnace power supply system is connected to the direct current bus of the electric furnace smelting system. Through the electricity generation state of real-time detection photovoltaic power generation system and the smelting power demand of direct current smelting furnace, judge whether phase-match of photovoltaic power generation system's output and the power demand of smelting furnace, and then adjust photovoltaic power generation system and electric stove power supply system's switching state, preferentially supply power to the electric arc furnace through photovoltaic power generation system, when photovoltaic system generated energy is not enough, supply power to the electric stove smelting system by electric stove power supply system additional electric quantity, guarantee the power demand of the normal operation of electric stove smelting system.
Furthermore, the photovoltaic power generation system and the electric furnace power supply system can respectively and independently supply power for the electric furnace smelting system and can also supply power for the electric furnace smelting system simultaneously.
Furthermore, the photovoltaic power generation system comprises a photovoltaic electric field, a distributed DC/DC and an energy storage system, electric energy generated by a distributed battery board of the photovoltaic electric field is converted by the distributed DC/DC and then is connected to the bus bar, the back stage is connected to the energy storage system and is connected to the DC bus through a No. 1 switch, and the capacity of the photovoltaic power generation system is matched with the power demand of smelting operation of the electric arc furnace.
Furthermore, the energy storage system consists of a charger, a battery system, a bidirectional DC/DC and a super capacitor, wherein the charger is used as a connecting medium of the battery system and the photovoltaic power generation system to control whether a bus bar charges the battery system, and the battery system is a battery with high performance, large energy storage capacity, low self-discharge rate, strong deep discharge capacity, high charging efficiency, less maintenance or no maintenance, wide working temperature range, low price and long cyclic charge and discharge life; the bidirectional DC/DC can control the bus bar to charge the super capacitor and also control the super capacitor to release energy to the bus bar.
Furthermore, when the generated energy of the photovoltaic power generation system cannot meet the power demand of the direct current smelting furnace, the electric furnace power supply system is connected with a rectifier transformer through power taking of a power grid, then is connected with a direct current bus through three-phase AC/DC to supply power, and a #2 switch controls the electric furnace power supply system to be put into operation and cut off operation.
Furthermore, the rear stage of the direct current bus is connected with a DC/DC direct current chopper, and then the direct current chopper is connected to a direct current smelting furnace for smelting operation.
Furthermore, the power generation state of the photovoltaic power generation system and the smelting power consumption requirement of the direct current smelting furnace are detected in real time, when the bus bar meets the smelting power consumption requirement of the electric furnace, the 1# switch is closed, the 2# switch is opened, the voltage and the current output by the distributed DC/DC are adjusted to transmit power to the direct current bus bar according to the smelting power consumption requirement of the electric furnace, meanwhile, the redundant energy of the bus bar utilizes the bidirectional DC/DC to charge and store energy to the super capacitor, and the bus bar is charged to the battery system through the charger after the capacitor energy storage is completed.
Further, the power generation state of the photovoltaic power generation system and the smelting power consumption requirement of the direct current smelting furnace are detected in real time, when the bus bar does not meet the smelting power consumption requirement of the electric furnace, and the super capacitor stores energy, the bus bar and the electric arc furnace power supply system supply power simultaneously, the 1# switch and the 2# switch are both closed, the electric furnace power supply system is put into operation to supply power, the super capacitor releases energy to the bus bar through the bidirectional DC/DC, the output voltage of the distributed DC/DC and the super capacitor is adjusted to be consistent with the output voltage of the three-phase AC/DC, and the charger stops charging the battery system.
Furthermore, the power generation state of the photovoltaic power generation system and the smelting power consumption requirement of the direct current smelting furnace are detected in real time, when the bus bar does not meet the smelting power consumption requirement of the electric furnace, after the energy stored by the super capacitor is released, the electric arc furnace power supply system only supplies power, the 1# switch is switched off, the 2# switch is switched on, the electric furnace power supply system is put into operation to supply power, the bus bar utilizes the bidirectional DC/DC to charge and store energy for the super capacitor, and after the energy storage of the capacitor is completed, the bus bar charges the battery system through the charger.
Further, when the electric furnace is in a working condition that electricity is not needed, such as blowing out or tapping, the switch 1 and the switch 2 are both switched off, the electric furnace power supply system stops supplying power to the electric furnace, the bus bar charges and stores energy to the super capacitor through the bidirectional DC/DC, and the bus bar charges the battery system through the charger after the energy storage of the capacitor is completed.
Furthermore, the 1# switch and the 2# switch are electronic switches and are composed of fully-controlled devices such as IGBTs.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a photovoltaic power generation and complemental direct current smelting furnace power supply system of electric wire netting which characterized in that: the system comprises a photovoltaic power generation system, an electric furnace power supply system and an electric furnace smelting system;
the output of the photovoltaic power generation system is connected to a direct current bus of the electric furnace smelting system, the front stage of the electric furnace power supply system is connected with a power grid, and the rear stage of the electric furnace power supply system is connected to the direct current bus of the electric furnace smelting system;
through the electricity generation state of real-time detection photovoltaic power generation system and the smelting power demand of direct current smelting furnace, judge whether phase-match of photovoltaic power generation system's output and the power demand of smelting furnace, adjust photovoltaic power generation system and electric stove power supply system's switching state, preferentially supply power to the electric arc furnace through photovoltaic power generation system, when photovoltaic system generated energy is not enough, supply power to electric stove smelting system by electric stove power supply system additional electric quantity, guarantee the power demand of the normal operation of electric stove smelting system.
2. The photovoltaic power generation and power grid complementary direct current smelting furnace power supply system according to claim 1, characterized in that: the photovoltaic power generation system and the electric furnace power supply system respectively and independently supply power to the electric furnace smelting system or simultaneously supply power to the electric furnace smelting system.
3. The photovoltaic power generation and power grid complementary direct current smelting furnace power supply system according to claim 1, characterized in that: the photovoltaic power generation system comprises a photovoltaic electric field, a distributed DC/DC and an energy storage system;
the electric energy that photovoltaic electric field distributed panel sent is connected to the busbar after the distributed DC/DC conversion, and the back level inserts energy storage system to insert the direct current bus through 1# switch, photovoltaic power generation system's capacity and the electric demand phase-match of electric arc furnace smelting operation.
4. The photovoltaic power generation and power grid complementary direct current smelting furnace power supply system according to claim 1, characterized in that: the energy storage system consists of a charger, a battery system, a bidirectional DC/DC and a super capacitor;
the charger is used as a connecting medium of the battery system and the photovoltaic power generation system, controls whether the bus bar charges the battery system or not,
the battery system is a plurality of battery packs;
the bidirectional DC/DC control bus bar charges the super capacitor, and the super capacitor is controlled to release energy to the bus bar;
when the generated energy of the photovoltaic power generation system cannot meet the power demand of the direct current smelting furnace, the electric furnace power supply system is connected with a rectifier transformer by taking power from a power grid and then is connected to a direct current bus through three-phase AC/DC for power supply, and a #2 switch controls the electric furnace power supply system to be put into operation and cut off operation.
5. The photovoltaic power generation and power grid complementary direct current smelting furnace power supply system according to claim 1, characterized in that: and the rear stage of the direct current bus is connected with a DC/DC direct current chopper and then connected to a direct current smelting furnace for smelting operation.
6. The power supply system of any one of claims 1 to 5, based on a photovoltaic power generation and power grid complementary direct current smelting furnace power supply method, characterized in that: the power supply system of the direct current smelting furnace detects the power generation state of the photovoltaic power generation system and the smelting power consumption demand of the direct current smelting furnace in real time;
when the bus bar meets the power consumption requirement of electric furnace smelting, the switch 1 is closed, the switch 2 is opened, and the voltage and current of the distributed DC/DC output are adjusted to transmit power to the DC bus bar according to the power consumption requirement of electric furnace smelting;
meanwhile, redundant energy of the bus bar is used for charging and storing energy to the super capacitor through the bidirectional DC/DC, and the bus bar is used for charging the battery system through the charger after the energy storage of the capacitor is completed.
7. The method of supplying power to a dc smelting furnace with photovoltaic power generation and grid complementation according to claim 6, characterized in that: the power generation state of the photovoltaic power generation system and the smelting power consumption requirement of the direct current smelting furnace are detected in real time, when the bus bar does not meet the smelting power consumption requirement of the electric furnace, and the super capacitor stores energy, the bus bar and the electric arc furnace power supply system supply power simultaneously, the 1# switch and the 2# switch are both closed, the electric furnace power supply system is put into operation to supply power, the super capacitor releases energy to the bus bar through the bidirectional DC/DC, the output voltage of the distributed DC/DC and the super capacitor is adjusted to be consistent with the output voltage of the three-phase AC/DC, and the charger stops charging the battery system.
8. The method according to claim 7, characterized by the fact that: the method comprises the steps of detecting the power generation state of a photovoltaic power generation system and the smelting power demand of a direct-current smelting furnace in real time, when a bus bar does not meet the smelting power demand of an electric furnace, after the energy of the super capacitor stored energy is released, only transmitting power by an electric arc furnace power supply system, disconnecting a 1# switch, closing a 2# switch, enabling the electric furnace power supply system to be in operation power supply, enabling the bus bar to utilize bidirectional DC/DC to charge and store the energy to the super capacitor, and enabling the bus bar to charge a battery system through a charger after the capacitor stores the energy.
9. The method according to claim 8, characterized by the fact that: when the electric furnace is in a working condition that electricity is not needed, such as furnace shutdown or steel tapping, the 1# switch and the 2# switch are both switched off, the electric furnace power supply system stops supplying power to the electric furnace, the bus bar utilizes the bidirectional DC/DC to charge and store energy to the super capacitor, and the bus bar charges the battery system through the charger after the capacitor energy storage is completed.
10. The method of supplying power to a dc furnace with photovoltaic power generation and complementary grid according to claim 9, characterized in that: and the 1# switch and the 2# switch are electronic switches and are composed of fully-controlled devices.
CN202111107831.5A 2021-09-22 2021-09-22 Photovoltaic power generation and power grid complementary direct current smelting furnace power supply system and method Pending CN113809774A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115333163A (en) * 2022-08-09 2022-11-11 北京科技大学 Energy supply control system and control method for electric arc furnace steelmaking with near-zero carbon emission
WO2023203322A1 (en) * 2022-04-20 2023-10-26 Empati Limited Real-time energy tracking method and system

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