JPH09229560A - Method for controlling flicker-restraining apparatus for arc furnace - Google Patents
Method for controlling flicker-restraining apparatus for arc furnaceInfo
- Publication number
- JPH09229560A JPH09229560A JP8034144A JP3414496A JPH09229560A JP H09229560 A JPH09229560 A JP H09229560A JP 8034144 A JP8034144 A JP 8034144A JP 3414496 A JP3414496 A JP 3414496A JP H09229560 A JPH09229560 A JP H09229560A
- Authority
- JP
- Japan
- Prior art keywords
- flicker
- arc furnace
- reactive power
- output capacity
- maximum output
- 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.)
- Pending
Links
Classifications
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Discharge Heating (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、アーク炉の操業
により発生するフリッカを抑制するアーク炉用フリッカ
抑制装置の制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling an flicker suppressing device for an arc furnace, which suppresses flicker generated by the operation of an arc furnace.
【0002】[0002]
【従来の技術】図3は、この種のアーク炉設備の従来の
ブロック構成図を示し、1は負荷時タップ切換器などを
含む炉用変圧器、2はアーク炉、2aは電極、3はこの
アーク炉設備の力率改善用の進相コンデンサ、4は高イ
ンピーダンス変圧器、5は高インピーダンス変圧器4の
二次巻線に接続されるサイリスタ変換器、6はアーク炉
2の無効電力検出器、7はサイリスタ変換器5のゲート
信号を出力してアーク炉2のフリッカを抑制するフリッ
カ制御回路、8はサイリスタ変換器5の最大出力容量を
設定する設定器である。2. Description of the Related Art FIG. 3 is a block diagram of a conventional arc furnace facility of this type. 1 is a transformer for a furnace including a load tap changer, 2 is an arc furnace, 2a is an electrode, 3 is an electrode. A phase-advancing capacitor for improving the power factor of this arc furnace equipment, 4 is a high impedance transformer, 5 is a thyristor converter connected to the secondary winding of the high impedance transformer 4, and 6 is reactive power detection of the arc furnace 2. Reference numeral 7 is a flicker control circuit that outputs a gate signal of the thyristor converter 5 to suppress flicker of the arc furnace 2, and 8 is a setting device that sets the maximum output capacity of the thyristor converter 5.
【0003】図3において、アーク炉用フリッカ抑制装
置は高インピーダンス変圧器4とサイリスタ変換器5と
無効電力検出器6とフリッカ制御回路7と設定器8とか
ら構成され、アーク炉2の操業により発生するフリッカ
を抑制するために高インピーダンス変圧器4の等価リア
クトルとサイリスタ変換器5のそれぞれのサイリスタの
点弧位相の制御とにより、図示の電力系統からこのアー
ク炉設備に流入する無効電力の変動を低減する方法がと
られている。In FIG. 3, the flicker suppressing device for an arc furnace comprises a high impedance transformer 4, a thyristor converter 5, a reactive power detector 6, a flicker control circuit 7 and a setting device 8. Fluctuation of the reactive power flowing into the arc furnace equipment from the illustrated power system by controlling the firing phase of the equivalent reactor of the high impedance transformer 4 and the thyristors of the thyristor converters 5 in order to suppress the generated flicker. Is being reduced.
【0004】図4は、従来のアーク炉用フリッカ抑制装
置の制御方法を示す波形図である。図4(イ)に示すア
ーク炉2に流入する無効電力QF (図3参照)の変動幅
が100%の場合には、アーク炉用フリッカ抑制装置の
出力容量QL (図3参照)は図4(ロ)に示す如く最大
100%まで変化しながらアーク炉2の操業により発生
するフリッカを抑制するように動作をし、その結果図4
(ハ)に示す如く電源系統(図3参照)からこのアーク
炉設備に流入する無効電力(QF +QL )の変動、すな
わちフリッカを抑制する。FIG. 4 is a waveform diagram showing a control method of a conventional flicker suppressing device for an arc furnace. When the fluctuation range of the reactive power Q F (see FIG. 3) flowing into the arc furnace 2 shown in FIG. 4 (a) is 100%, the output capacity Q L (see FIG. 3) of the flicker suppressing device for an arc furnace is As shown in FIG. 4B, the operation is performed so as to suppress the flicker generated by the operation of the arc furnace 2 while changing up to 100%.
As shown in (c), fluctuations of reactive power (Q F + Q L ) flowing from the power supply system (see FIG. 3) into the arc furnace facility, that is, flicker is suppressed.
【0005】また例えば、図4(a)に示すアーク炉2
に流入する無効電力QF (図3参照)の変動幅が50%
の場合には、アーク炉用フリッカ抑制装置の出力容量Q
L (図3参照)は図4(b)に示す如く最大100%ま
で変化しながらアーク炉2の操業により発生するフリッ
カを抑制するように動作をし、その結果図4(c)に示
す如く電源系統(図3参照)からこのアーク炉設備に流
入する無効電力(QF+QL )の変動、すなわちフリッ
カを抑制している。Further, for example, the arc furnace 2 shown in FIG.
Fluctuation range of reactive power Q F (see Fig. 3) flowing into
In the case of, the output capacity Q of the flicker suppression device for arc furnace
As shown in FIG. 4B, L (see FIG. 3) operates so as to suppress flicker generated by the operation of the arc furnace 2 while changing up to 100%, and as a result, as shown in FIG. 4C. Fluctuation of the reactive power (Q F + Q L ) that flows into this arc furnace facility from the power supply system (see FIG. 3), that is, flicker is suppressed.
【0006】[0006]
【発明が解決しようとする課題】上述の従来のアーク炉
用フリッカ抑制装置の制御方法によると、図3において
アーク炉2の操業状態に無関係にアーク炉用フリッカ抑
制装置の最大出力容量を設定する設定器8の設定値を一
定値としているために、図4(a)に示したアーク炉2
に流入する無効電力QF の変動幅が50%の場合にも、
アーク炉用フリッカ抑制装置の出力容量QL は図4
(b)に示す如く最大100%まで変化し、その結果図
4(c)に示す如く電源系統(図3参照)からこのアー
ク炉設備に流入する無効電力(QF +QL )も100%
近辺の値となり、このアーク炉設備の電力損失が大きい
という問題があった。According to the conventional control method for the flicker suppressing device for an arc furnace described above, the maximum output capacity of the flicker suppressing device for an arc furnace is set in FIG. 3 regardless of the operating state of the arc furnace 2. Since the set value of the setter 8 is constant, the arc furnace 2 shown in FIG.
Even if the fluctuation range of the reactive power Q F flowing in is 50%,
The output capacity Q L of the flicker suppression device for arc furnace is shown in Fig. 4.
As shown in (b), it changes up to 100%, and as a result, as shown in FIG. 4 (c), the reactive power (Q F + Q L ) flowing into this arc furnace facility from the power supply system (see FIG. 3) is also 100%.
There is a problem that the electric power loss of this arc furnace equipment is large because the value is in the vicinity.
【0007】この発明の目的は、上記問題点を解決する
アーク炉用フリッカ抑制装置の制御方法を提供すること
にある。An object of the present invention is to provide a control method of an flicker suppressing device for an arc furnace which solves the above problems.
【0008】[0008]
【課題を解決するための手段】この発明は、アーク炉の
操業により発生するフリッカを抑制するアーク炉用フリ
ッカ抑制装置の制御方法において、前記アーク炉の操業
状態に応じてアーク炉用フリッカ抑制装置の最大出力容
量を切り替えるようにする。この発明によれば、アーク
炉が通流を開始して電極が穴を掘るような状態でアーク
が発生して下降するボーリング期、ボーリング終了後ス
クラップを完全に溶かすまでの溶解期、スクラップを完
全に溶かした状態の酸化,還元期と操業状態が刻々と変
化をし、これらの操業状態におけるフリッカ発生量も、
一般的にボーリング期>溶解期>酸化,還元期の関係に
あるのでアーク炉の操業状態に応じてアーク炉用フリッ
カ抑制装置の最大出力容量を切り替えることが可能であ
り、この制御方法により、このアーク炉設備の電力損失
の低減が計れる。SUMMARY OF THE INVENTION The present invention provides a method for controlling an flicker suppressing device for an arc furnace which suppresses flicker caused by the operation of the arc furnace, and a flicker suppressing device for an arc furnace according to the operating state of the arc furnace. Switch the maximum output capacity of. According to the present invention, a boring period in which the arc furnace starts flowing and an arc is generated in a state where an electrode digs a hole and descends, a melting period until the scrap is completely melted after the boring is completed, and scrap is completely removed. Oxidation and reduction periods in the state of being dissolved in water and the operating state change every moment, and the amount of flicker generated in these operating states is also
Generally, there is a relation of boring period> melting period> oxidation and reduction period, so it is possible to switch the maximum output capacity of the arc furnace flicker suppressing device according to the operating state of the arc furnace. The power loss of the arc furnace equipment can be reduced.
【0009】[0009]
【発明の実施の形態】図1は、この発明のアーク炉用フ
リッカ抑制装置の制御方法の実施例を示すアーク炉設備
のブロック構成図であり、図3に示した従来例と同一機
能を有するものには同一符号を付してその説明を省略す
る。すなわち図1において、アーク炉用フリッカ抑制装
置は高インピーダンス変圧器4とサイリスタ変換器5と
無効電力検出器6とフリッカ制御回路14と設定器11
〜13と切替回路10とから構成され、切替回路10は
無効電力検出器6の出力からアーク炉2の操業により発
生するフリッカの変動幅を検知し、この変動幅から設定
器11〜13それぞれの設定値からいずれかを選択して
フリッカ制御回路14に入力し、フリッカ制御回路14
の制御によりサイリスタ変換器5の最大出力容量を設定
器11〜13のいずれか選択された設定値の容量までの
範囲でフリッカを抑制するように動作する。1 is a block diagram of an arc furnace facility showing an embodiment of a control method for an flicker suppressing device for an arc furnace according to the present invention, which has the same function as the conventional example shown in FIG. The same reference numerals are given to the components, and the description thereof will be omitted. That is, in FIG. 1, the flicker suppressing device for an arc furnace includes a high impedance transformer 4, a thyristor converter 5, a reactive power detector 6, a flicker control circuit 14, and a setter 11.
13 to 13 and the switching circuit 10, the switching circuit 10 detects the fluctuation range of the flicker generated by the operation of the arc furnace 2 from the output of the reactive power detector 6, and detects the fluctuation range of each of the setters 11 to 13 from this fluctuation range. One of the set values is selected and input to the flicker control circuit 14,
By the control of 1), the maximum output capacity of the thyristor converter 5 operates to suppress flicker within a range up to the capacity of the set value selected by any one of the setters 11 to 13.
【0010】図2は、この発明のアーク炉用フリッカ抑
制装置の制御方法を示す波形図であり、図2(イ)に示
すアーク炉2に流入する無効電力QF (図1参照)の変
動幅が100%の場合には、例えば設定器11が切替回
路10により選択され、アーク炉用フリッカ抑制装置の
出力容量QL (図1参照)は図2(ロ)に示す如く最大
100%まで変化しながらアーク炉2の操業により発生
するフリッカを抑制するように動作をし、その結果図2
(ハ)に示す如く電源系統(図1参照)からこのアーク
炉設備に流入する無効電力(QF +QL )も100%近
辺の値を維持しつつ、このアーク炉設備のフリッカを抑
制し、この場合には図3に示した従来例と同様の動作で
ある。FIG. 2 is a waveform diagram showing a method of controlling the flicker suppressing device for an arc furnace according to the present invention. The fluctuation of the reactive power Q F (see FIG. 1) flowing into the arc furnace 2 shown in FIG. When the width is 100%, for example, the setting device 11 is selected by the switching circuit 10 and the output capacity Q L (see FIG. 1) of the flicker suppressing device for an arc furnace is up to 100% as shown in FIG. While changing, it operates so as to suppress the flicker generated by the operation of the arc furnace 2, and as a result, FIG.
As shown in (c), the reactive power (Q F + Q L ) that flows into this arc furnace equipment from the power supply system (see FIG. 1) also maintains a value near 100%, while suppressing the flicker of this arc furnace equipment, In this case, the operation is similar to that of the conventional example shown in FIG.
【0011】また例えば、図2(a)に示すアーク炉2
に流入する無効電力QF (図1参照)の変動幅が50%
の場合には、例えば設定器13が切替回路10により選
択され、アーク炉用フリッカ抑制装置の出力容量Q
L (図1参照)は図2(b)に示す如く最大50%まで
変化しながらアーク炉2の操業により発生するフリッカ
を抑制するように動作をし、その結果図2(c)に示す
如く電源系統(図1参照)からこのアーク炉設備に流入
する無効電力(QF +QL )も50%近辺の値を維持し
つつ、このアーク炉設備のフリッカを抑制している。Further, for example, the arc furnace 2 shown in FIG.
Fluctuation range of reactive power Q F (see Fig. 1) flowing into
In the case of, for example, the setting device 13 is selected by the switching circuit 10, and the output capacity Q of the flicker suppressing device for an arc furnace is selected.
As shown in FIG. 2C, L (see FIG. 1) operates to suppress flicker generated by the operation of the arc furnace 2 while changing up to 50% as shown in FIG. 2B. reactive power flowing from the power supply system (see FIG. 1) to the arc furnaces (Q F + Q L) while maintaining the value of around 50%, thereby suppressing flicker of the arc furnace facilities.
【0012】この発明の実施例においては、3個の設定
器11〜13を切替回路10により無効電力検出器6の
出力からアーク炉2の操業により発生するフリッカの変
動幅を検知して切替えており、前述のボーリング期、溶
解期、酸化,還元期それぞれに対応させると好適であ
る。また、前記ボーリング期、溶解期、酸化,還元期
は、アーク炉の操業形態によってはほぼ一定の時間間隔
となるので、前記切替回路の機能をタイマで構成するこ
とも可能である。In the embodiment of the present invention, the three setting devices 11 to 13 are switched by the switching circuit 10 by detecting the fluctuation range of the flicker generated by the operation of the arc furnace 2 from the output of the reactive power detector 6. Therefore, it is preferable to correspond to each of the above-mentioned boring period, dissolution period, oxidation, and reduction period. Further, the boring period, the melting period, the oxidation period, and the reduction period have substantially constant time intervals depending on the operation mode of the arc furnace, so that the function of the switching circuit can be configured by a timer.
【0013】[0013]
【発明の効果】この発明によれば、アーク炉の操業状態
に応じてアーク炉用フリッカ抑制装置の最大出力容量を
切り替えることにより、アーク炉設備のフリッカを抑制
しつつこのアーク炉設備の電力損失の低減が計れる。According to the present invention, by switching the maximum output capacity of the flicker suppressing device for an arc furnace according to the operating state of the arc furnace, the flicker of the arc furnace equipment is suppressed and the power loss of this arc furnace equipment is reduced. Can be reduced.
【図1】この発明のアーク炉用フリッカ抑制装置の制御
方法の実施例を示すアーク炉設備のブロック構成図FIG. 1 is a block diagram of an arc furnace facility showing an embodiment of a control method of an flicker suppressing device for an arc furnace of the present invention.
【図2】図1の動作を説明する波形図FIG. 2 is a waveform chart illustrating the operation of FIG.
【図3】アーク炉用フリッカ抑制装置の制御方法の従来
例を示すアーク炉設備のブロック構成図FIG. 3 is a block configuration diagram of an arc furnace facility showing a conventional example of a control method of an flicker suppressing device for an arc furnace.
【図4】図3の動作を説明する波形図FIG. 4 is a waveform chart for explaining the operation of FIG. 3;
1…炉用変圧器、2…アーク炉、2a…電極、3…進相
コンデンサ、4…高インピーダンス変圧器、5…サイリ
スタ変換器、6…無効電力検出器、7,14…フリッカ
制御回路、8,11〜13…設定器、10…切替回路。1 ... Reactor transformer, 2 ... Arc furnace, 2a ... Electrode, 3 ... Phase advancing capacitor, 4 ... High impedance transformer, 5 ... Thyristor converter, 6 ... Reactive power detector, 7, 14 ... Flicker control circuit, 8, 11 to 13 ... Setting device, 10 ... Switching circuit.
Claims (1)
抑制するアーク炉用フリッカ抑制装置の制御方法におい
て、 アーク炉の操業状態に応じてアーク炉用フリッカ抑制装
置の最大出力容量を切り替えることを特徴とするアーク
炉用フリッカ抑制装置の制御方法。1. A method of controlling an flicker suppressing device for an arc furnace, which suppresses flicker generated by the operation of an arc furnace, wherein the maximum output capacity of the flicker suppressing device for an arc furnace is switched according to the operating state of the arc furnace. Control method for flicker suppression device for arc furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8034144A JPH09229560A (en) | 1996-02-22 | 1996-02-22 | Method for controlling flicker-restraining apparatus for arc furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8034144A JPH09229560A (en) | 1996-02-22 | 1996-02-22 | Method for controlling flicker-restraining apparatus for arc furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09229560A true JPH09229560A (en) | 1997-09-05 |
Family
ID=12406019
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8034144A Pending JPH09229560A (en) | 1996-02-22 | 1996-02-22 | Method for controlling flicker-restraining apparatus for arc furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09229560A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2606672C2 (en) * | 2012-09-25 | 2017-01-10 | Сименс Акциенгезелльшафт | Method of reducing flicker in electric arc furnaces and device for its implementation |
RU2632366C2 (en) * | 2015-07-30 | 2017-10-04 | Даниели Отомейшн Спа | Method and device for feeding electric power to electric arc furnace |
RU2725489C2 (en) * | 2015-06-05 | 2020-07-02 | Хэтч Лтд. | Flicker suppression at electric arc furnace |
-
1996
- 1996-02-22 JP JP8034144A patent/JPH09229560A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2606672C2 (en) * | 2012-09-25 | 2017-01-10 | Сименс Акциенгезелльшафт | Method of reducing flicker in electric arc furnaces and device for its implementation |
US10145612B2 (en) | 2012-09-25 | 2018-12-04 | Siemens Aktiengesellschaft | Flicker reduction in electric arc furnaces by means of flicker prediction from the state determination in the initial phase of the smelting process |
RU2725489C2 (en) * | 2015-06-05 | 2020-07-02 | Хэтч Лтд. | Flicker suppression at electric arc furnace |
RU2632366C2 (en) * | 2015-07-30 | 2017-10-04 | Даниели Отомейшн Спа | Method and device for feeding electric power to electric arc furnace |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH0145297B2 (en) | ||
US4607374A (en) | Method for controlling arc furnace | |
US3999078A (en) | Interruption free inverter power supply | |
JPH09229560A (en) | Method for controlling flicker-restraining apparatus for arc furnace | |
JPS60207461A (en) | Controlling method and device of conversion apparatus | |
JP3055138B2 (en) | Battery charger | |
JP3885842B2 (en) | Flicker control method and apparatus for arc furnace | |
US3947746A (en) | Single-ended dc-to-dc converter for the pulse control of the voltage at an inductive load as well as method for its operation | |
US3217205A (en) | Electric furnace electrode position control | |
KR20120106651A (en) | Dissolution state determination device of arc furnace | |
JP2010014306A (en) | Electrode lifting/lowering device of arc furnace for steel making | |
JP2001004281A (en) | Controller for electrode lifting device for arc furnace | |
JPH0670573A (en) | Speed controller for wound-rotor induction motor | |
JP2665296B2 (en) | DC arc furnace voltage controller | |
JPH0832364B2 (en) | Power supply for welding machine | |
JP2005012954A (en) | Voltage switching control method and voltage switching control device | |
JPS5890375A (en) | Arc welding machine | |
JPS5457644A (en) | Automatic voltage regulator of transformer tap change controller for converters | |
JPH01238431A (en) | Automatic load selector | |
JPH02235574A (en) | Alternating current arc welding power unit | |
JPH061948B2 (en) | Reactive power compensation system | |
JPS5772775A (en) | Consumable electrode type pulse arc welding device | |
JPH0147096B2 (en) | ||
JPH10337043A (en) | Power conversion device | |
JPH01313891A (en) | Dc arc furnace |