JP2962442B2 - DC arc furnace - Google Patents
DC arc furnaceInfo
- Publication number
- JP2962442B2 JP2962442B2 JP3300457A JP30045791A JP2962442B2 JP 2962442 B2 JP2962442 B2 JP 2962442B2 JP 3300457 A JP3300457 A JP 3300457A JP 30045791 A JP30045791 A JP 30045791A JP 2962442 B2 JP2962442 B2 JP 2962442B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- current
- constant
- arc furnace
- arc
- 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.)
- Expired - Lifetime
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)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、直流ア―ク炉に係り、
特に、交流電源電圧の変動或いは直流電圧の変動によっ
て、無効電力が変動しないようにした直流アーク炉に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC arc furnace,
In particular, the present invention relates to a DC arc furnace in which reactive power does not fluctuate due to fluctuations in AC power supply voltage or DC voltage.
【０００２】[0002]
【従来の技術】図２は、従来の直流ア―ク炉の概略構成
図であり、断路器１及び遮断器２を介して図示しない交
流系統母線から供給される交流は整流器用変圧器３で所
望の電圧に変換され、サイリスタ整流器４にて直流に変
換される。サイリスタ整流器４の一端に直流リアクトル
５を介して直流ア―ク炉の電極６を接続し、サイリスタ
整流器４の他端に直流ア―ク炉の本体７を接続する。直
流ア―ク炉の電流を一定に制御するために、直流電流設
定器８の設定値と、直流変流器９で検出されるサイリス
タ整流器４の出力電流を、直流電流検出器１０で所望レ
ベルの電流に変換した直流電流帰還信号とを加算器１１
に加え、その偏差を位相制御器１２に印加してサイリス
タ整流器４の出力電流を制御する。2. Description of the Related Art FIG. 2 is a schematic diagram of a conventional DC arc furnace. AC supplied from an AC system bus (not shown) via a disconnector 1 and a circuit breaker 2 is supplied to a rectifier transformer 3. The thyristor rectifier 4 converts the voltage into a desired voltage and converts it into a direct current. An electrode 6 of a DC arc furnace is connected to one end of the thyristor rectifier 4 via a DC reactor 5, and a main body 7 of the DC arc furnace is connected to the other end of the thyristor rectifier 4. In order to keep the current of the DC arc furnace constant, the set value of the DC current setting device 8 and the output current of the thyristor rectifier 4 detected by the DC current transformer 9 are adjusted to a desired level by the DC current detector 10. The DC current feedback signal converted to the current of
In addition, the deviation is applied to the phase controller 12 to control the output current of the thyristor rectifier 4.
【０００３】一方、サイリスタ整流器４の出力電圧を制
御するために、直流電圧設定器１３の設定値と、サイリ
スタ整流器４の出力電圧を検出する直流電圧検出器１４
の出力信号とを加算器１５に加え、その偏差を駆動装置
１６に印加し、この駆動装置１６で電極昇降用電動機１
７の回転方向及び回転速度を制御して直流ア―ク炉の電
極の昇降を制御する。On the other hand, in order to control the output voltage of the thyristor rectifier 4, a set value of a DC voltage setting unit 13 and a DC voltage detector 14 for detecting the output voltage of the thyristor rectifier 4 are used.
Is applied to an adder 15, and the deviation is applied to a driving device 16.
The rotation direction and rotation speed of 7 are controlled to control the elevation of the electrodes of the DC arc furnace.
【０００４】図２のように構成された、直流ア―ク炉に
おいは、一般にア―ク炉に投入する有効電力を一定に保
つようにサイリスタ整流器４の定電流制御及び電極昇降
による出電圧制御にて制御されている。In a DC arc furnace constructed as shown in FIG. 2, generally, the constant current control of the thyristor rectifier 4 and the output voltage control by raising and lowering the electrodes are performed so as to keep the active power supplied to the arc furnace constant. Is controlled by
【０００５】[0005]
【発明が解決しようとする課題】このような制御装置に
おいては、炉内でスクラップの崩落或いは溶鋼の動揺が
生じてア―ク長が短くなったり、或いは長くなった場
合、ア―ク電流はサイリスタ整流器４の位相制御によっ
て短い時間で設定値に戻るように制御されるが、ア―ク
電圧はア―ク長に比例するので、稼動電力の昇降移動に
より制御されて設定値に戻るためには応答の遅れによっ
て時間がかかる。この時の交流側に発生する有効電力と
無効電力の特性は図３の示すようになり炉内短絡時には
大きな無効電力が発生し、系統の電圧降下が大きくな
る。In such a control device, when the arc length is shortened or lengthened due to the collapse of scrap or the sway of molten steel in the furnace, the arc current is reduced. It is controlled by the phase control of the thyristor rectifier 4 to return to the set value in a short time. However, since the arc voltage is proportional to the arc length, it is controlled by the up and down movement of the operating power to return to the set value. Takes longer due to delayed response. At this time, the characteristics of the active power and the reactive power generated on the AC side are as shown in FIG. 3. When the furnace is short-circuited, large reactive power is generated, and the voltage drop of the system becomes large.
【０００６】本発明は簡易な構成でア―クの変動により
発生する無効電力が変動することを抑制し、溶解中にお
いて電源系統の無効電力による電圧降下を低減すること
が可能な直流ア―ク炉を提供することを目的とする。According to the present invention, a DC arc which has a simple configuration and suppresses the fluctuation of the reactive power generated by the fluctuation of the arc, and can reduce the voltage drop due to the reactive power of the power supply system during melting. It is intended to provide a furnace.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記目的を達
成するために、サイリスタ整流器によって付勢される直
流ア―ク炉に流れる直流電流を一定に制御する定電流制
御回路と、定電圧制御回路によってア―ク電圧を一定に
保つよう電極の昇降を行う電極制御装置を具備する直流
ア―ク炉において、前記サイリスタ整流器の交流側電圧
の実測値ＶAC´と基準値ＶAC及び直流側電圧の実測値Ｅ
d ´と、前記サイリスタ整流器の直流出力電圧の基準値
Ｅd から前記サイリスタ整流器の出力電流の基準値Ｉd
をＩd ´に補正する電流補正手段を備したことを特徴と
するものである。In order to achieve the above object, the present invention provides a constant current control circuit for controlling a DC current flowing through a DC arc furnace energized by a thyristor rectifier, and a constant voltage control circuit. In a DC arc furnace equipped with an electrode control device that raises and lowers an electrode so that an arc voltage is kept constant by a control circuit, an actual measured value VAC ', a reference value VAC, and a DC side voltage of an AC side voltage of the thyristor rectifier are provided. Measured value E of
d 'and the reference value Ed of the output current of the thyristor rectifier from the reference value Ed of the DC output voltage of the thyristor rectifier.
Is corrected to Id '.
【０００８】[0008]
【作用】直流ア―ク炉の交流側に発生する皮送電力Ｓと
有効電力Ｐ及び無効電力Ｑとの間には下式の関係があ
る。 Ｓ2 ＝Ｐ2 ＋Ｑ2 但し、ＶAC：サイリスタ整流器の交流電圧 Ｅd ：サイリスタ整流器の直流出力電圧 Ｉd ：サイリスタ整流器の直流出力電流 ここで、ＶACまたはＥd がＶAC´またはＥd ´に変化し
た場合、Ｉd は定電流制御によりより一定に保たれる為
ＱがＱ´となる。即ち、 これを防止するためにＩd をＩd ´としてＱ´をＱとす
れば となるようにＩd をＩd ´となるように補正すればＱを
一定にできる。[Effect] Skin power S generated on the AC side of the DC arc furnace and
The relationship between the active power P and the reactive power Q is as follows:
You. STwo = PTwo + QTwo Where VAC: AC voltage of thyristor rectifier Ed: DC output voltage of thyristor rectifier Id: DC output current of thyristor rectifierHere, VAC or Ed changes to VAC 'or Ed'.
In this case, Id is kept more constant by constant current control.
Q becomes Q '. That is,To prevent this, let Id be Id 'and Q' be Q.
IfIf Id is corrected to be Id 'so that
Can be constant.
【０００９】[0009]
【実施例】以下変発明の一実施例を図面を参照して説明
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention will be described below with reference to the drawings.
【００１０】図１は、本発明による直流アーク炉の制御
装置の構成例を示す回路構成図である。図１において、
電流補正手段１８は交流電圧を降圧してサイリスタ整流
器４に交流電源を供給する整流器用変圧器３の電源側に
接続された計測用変圧器１９にて検出された交流電圧Ｖ
AC´と、サイリスイタ整流器４の直流電圧を検出する直
流電圧検出器１４にて検出された直流電圧Ｅd ´と、こ
の直流電圧を一定に保つようにアーク電極６を昇降する
電極昇降用電動機１７を駆動する駆動装置１６に偏差信
号を加える加算器１５へ設定値を与える直流電圧設定器
１３の設定値信号Ｅd と、基準電圧発生器２０から与え
られる交流電圧ＶACとからから前述のＱ一定とするため
の電流補正信号Ａを演算出力する。ここでＡは、 FIG. 1 is a circuit diagram showing a configuration example of a control device for a DC arc furnace according to the present invention. In FIG.
The current correcting means 18 reduces the AC voltage and supplies the AC power to the thyristor rectifier 4. The AC voltage V detected by the measuring transformer 19 connected to the power supply side of the rectifier transformer 3 is supplied.
AC ′, the DC voltage Ed ′ detected by the DC voltage detector 14 for detecting the DC voltage of the thyristor rectifier 4, and the electrode lifting / lowering motor 17 for raising and lowering the arc electrode 6 so as to keep this DC voltage constant. The Q value is determined from the set value signal Ed of the DC voltage setting unit 13 for providing a set value to the adder 15 for adding the deviation signal to the driving device 16 to be driven and the AC voltage VAC provided from the reference voltage generator 20. And outputs a current correction signal A for calculation. Where A is
【００１１】この電流補正手段１８の出力信号Ａと、直
流電流設定器８の電流設定信号Ｂ＝Ｉd とを乗算器２１
によって乗算した値Ｉd ´と、直流電流検出器１０の出
力信号と加算器１１にて加算し、この加算器１１の出力
信号を電流偏差として位相制御器１２にてサイリスタ整
流器４を制御することによりＱ一定制御を行うことがで
きる。The output signal A of the current correction means 18 and the current setting signal B = Id of the DC current setting device 8 are multiplied by a multiplier 21.
And the output signal of the DC current detector 10 is added to the output signal of the DC current detector 10 by the adder 11, and the output signal of the adder 11 is used as a current deviation to control the thyristor rectifier 4 by the phase controller 12. Q constant control can be performed.
【００１２】[0012]
【発明の効果】以上説明したように、本発明によれば、
簡易な回路構成でア―クの変化による無効電力の変動を
抑制することができる。As described above, according to the present invention,
Variations in reactive power due to changes in arc can be suppressed with a simple circuit configuration.
【図１】本発明の一実施例を示す回路構成図。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図２】従来のひ直流ア―ク炉制御装置の回路構成図。FIG. 2 is a circuit diagram of a conventional DC arc furnace control device.
【図３】図２の従来の制御装置による無効電力、有効電
力の特性を示す特性図。FIG. 3 is a characteristic diagram showing characteristics of reactive power and active power by the conventional control device of FIG. 2;
１ …断路器 ２ …遮断器 ３ …整流器用変圧器 ４ …サイリ
スタ整流器 ５ …直流リアクトル ６ …電極 ７ …アーク炉本体 ８ …直流電
流設定器 ９ …直流変器 １０ …直流電
流検出器 １１ …加算器 １２ …位相制
御器 １３ …直流電圧設定器 １４ …直流電
圧検出器 １５ …加算器 １６ …駆動装
置 １７ …電極昇降用電動機 １８ …電流補
正手段 １９ …計測用変圧器 ２０ …基準電
圧発生器 ２１ …乗算器DESCRIPTION OF SYMBOLS 1 ... Disconnector 2 ... Circuit breaker 3 ... Rectifier transformer 4 ... Thyristor rectifier 5 ... DC reactor 6 ... Electrode 7 ... Arc furnace main body 8 ... DC current setting device 9 ... DC transformer 10 ... DC current detector 11 ... Addition Device 12 ... Phase controller 13 ... DC voltage setting device 14 ... DC voltage detector 15 ... Adder 16 ... Driving device 17 ... Electrode elevating motor 18 ... Current correcting means 19 ... Measurement transformer 20 ... Reference voltage generator 21 … Multiplier
Claims (1)
直流ア―ク炉に流れる直流電流を一定に制御する定電流
制御回路と、定電圧制御回路によってア―ク電圧を一定
に保つよう電極の昇降を行う電極制御装置を具備する直
流ア―ク炉において、前記サイリスタ整流器の交流側電
圧の実測値と基準値及び直流側電圧の実測値と、前記サ
イリスタ整流器の直流出力電圧の基準値から、前記サイ
リスタ整流器の出力電流の基準値を補正する電流補正手
段を備し、交流側に発生する無効電力を一定に保つよう
に直流ア―ク電流を補正するようにした直流ア―ク炉。1. A constant current control circuit for controlling a DC current flowing through a DC arc furnace energized by a thyristor rectifier at a constant level, and raising and lowering an electrode by a constant voltage control circuit to maintain a constant arc voltage. In a DC arc furnace having an electrode control device for performing thyristor rectification, the measured value and reference value of the AC side voltage of the thyristor rectifier and the measured value of the DC side voltage and the reference value of the DC output voltage of the thyristor rectifier are used to determine the thyristor. A DC arc furnace having a current correcting means for correcting a reference value of an output current of a rectifier, and correcting a DC arc current so as to keep a reactive power generated on an AC side constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3300457A JP2962442B2 (en) | 1991-11-15 | 1991-11-15 | DC arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3300457A JP2962442B2 (en) | 1991-11-15 | 1991-11-15 | DC arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05135871A JPH05135871A (en) | 1993-06-01 |
| JP2962442B2 true JP2962442B2 (en) | 1999-10-12 |
Family
ID=17885028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3300457A Expired - Lifetime JP2962442B2 (en) | 1991-11-15 | 1991-11-15 | DC arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2962442B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3041317B2 (en) * | 1992-01-09 | 2000-05-15 | 三菱電機株式会社 | DC arc furnace power supply |
| JP5862523B2 (en) * | 2012-09-07 | 2016-02-16 | 東芝三菱電機産業システム株式会社 | Electrode lifting device |
-
1991
- 1991-11-15 JP JP3300457A patent/JP2962442B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05135871A (en) | 1993-06-01 |
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