CN103103569A - Electrolytic-aluminium stabilized current control method - Google Patents
Electrolytic-aluminium stabilized current control method Download PDFInfo
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- CN103103569A CN103103569A CN201310041660XA CN201310041660A CN103103569A CN 103103569 A CN103103569 A CN 103103569A CN 201310041660X A CN201310041660X A CN 201310041660XA CN 201310041660 A CN201310041660 A CN 201310041660A CN 103103569 A CN103103569 A CN 103103569A
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- thyristor
- tap changer
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Abstract
The invention discloses an electrolytic-aluminium stabilized current control method, and belongs to the field of chemical and metallurgical low-voltage high-current rectifier control. The method disclosed by the invention is applicable to an electrolytic-aluminium power supply system consisting of a thyristor rectifier; under the working conditions of the occurrence of an anode effect and unit failure and maintenance, a situation that the deviation of an actual measured value and a preset value of a series current exceeds the threshold value is judged firstly, and then a situation that a trigger angle is in a linear area is judged; when the trigger angle is in the linear area, the deviation of a given value and an actual value of a single unit current is taken as the input of a small closed-loop PID (proportion integration differentiation) controller, and through adjusting the trigger angle, the control on direct-current output is realized; and when the trigger angle is in a cut-off area or a saturated area, after a period of time delay, a current tap of an on-load tap changing transformer is adjusted so as to realize the step adjustment of an alternating-current side voltage, thereby indirectly controlling the direct current output. The invention provides an electrolytic-aluminium stabilized current control method through which the stabilized current accuracy and the response speed can be improved.
Description
Technical field
The present invention relates to a kind of electrolytic aluminum current stabilization control method, belong to chemical industry and metallurgical with low-voltage, high-current rectifying installation control field.
Background technology
Electrolytic aluminum is a kind of important industrial load, continuously supplies with the normal production of direct current guarantee aluminium liquid.In electrolytic aluminum, anode effect can cause that potline current fluctuates widely; If without steady flow measure, runout can appear in liquid aluminum, easily causes intereelectrode short-circuit.The main gordian technique of electrolytic aluminum comprises large pre-baked cell technology, super dense supply technology and power-supply rectifying technology, and the automatic steady current control techniques is the core of power-supply rectifying technology, and the precision that current stabilization is controlled directly has influence on the height of electrolysis production technology level.So, guarantee that the smoothness of galvanic current can increase electrolytic aluminum output, also can improve current efficiency, reduce ton aluminium power consumption.
The galvanic current required due to Aluminum Electrolysis Production is larger, and single unit generally can't be completed supply, and also there is the large problem of fluctuation of current in single unit power supply simultaneously, and therefore the general multicomputer that adopts consists of more pulse wave DC parallel output power supplies.Each 6 pulse waves of 2 rectifier cabinets of every unit are regulated separately own fine tuning element, assurance separately galvanic current and the steady output of serial total current.Present rectification scheme has two kinds, and a kind of is kenotron rectifier, and a kind of is silicon controlled rectifier.Aspect the current control precision, the latter has significant superiority.But the direct current power load of considering electrolytic aluminium factory is large and concentrate, and is very large harmonic source, and natural power factor is only 0.86 left and right, and is more serious when particularly deeply controlling.As not administering well, particularly power plant for self-supply's impact is larger on power system, so when adopting thyristor rectifier, still adopt the ULTC of more progression.But about the control of ULTC, be all to regulate by experience for a long time, when the special operation conditions such as anode effect occured, the adjusting of ULTC always lagged behind.And directly causing current stabilization Controlling System response speed slow, the bad reason of adjusting function is to lack on-load transformer tap changer is switched the research of coordinating control with the thyristor Trigger Angle.
Summary of the invention
Slow in order to solve existing electrolytic aluminum current stabilization Controlling System response speed, adjusting function is bad, and causes the problems such as the electrolytic aluminum energy consumption is too high, economic benefit is lower, the invention provides a kind of electrolytic aluminum current stabilization control method that can improve precision of steady current and response speed.
In order to address the above problem, the technical scheme that this programme is taked is that a kind of method that electrolytic aluminum current stabilization is controlled comprises the following steps:
At first step (1) when electrolyzer generation anode effect or generating set are under the operating mode of fault, maintenance, judges whether the actual measured value of potline current and the deviation of set(ting)value surpass predefined threshold value:
When result is yes, preferentially regulate on-load transformer tap changer, until above-mentioned deviation less than threshold value, enters step (2); When result is no, directly enter step (2);
Step (2) judges whether the thyristor Trigger Angle in generating set is in linear section, is handled as follows:
If A thyristor Trigger Angle this moment is in linear section, regulate the thyristor Trigger Angle, until anode effect or fault disappear;
If B thyristor Trigger Angle this moment is in cut-off region or saturation region, regulate on-load transformer tap changer, until the thyristor Trigger Angle is in linear section, return to steps A.
The concrete grammar of regulating on-load transformer tap changer in described step (1) is as follows:
When Δ I＞0 and | Δ I|＞I
setThe time, regulate on-load transformer tap changer, carry out the operation that lowers category;
When Δ I＜0 and | Δ I|＞I
setThe time, regulate on-load transformer tap changer, carry out upshift operation;
Wherein, Δ I is the actual measured value of potline current and the deviation of set(ting)value, I
setBe the threshold value of setting.
Specific as follows in described step (2):
For the thyristor rectifier unit, adopt thyristor Trigger Angle α as the sign of distinguishing each section, determine minimum trigger angle α according to the blow-out requirement of thyristor
min, require to determine maximum Trigger Angle α according to the output power factor
max
Work as α
min≤ α≤α
maxThe time, Trigger Angle is in linear section, regulates the thyristor Trigger Angle in the thyristor rectifier unit, and described Trigger Angle regulation range is α
min~ α
max
As thyristor Trigger Angle α＜α
minThe time, Trigger Angle is in cut-off region, regulates on-load transformer tap changer;
As α＞α
maxThe time, Trigger Angle is in the saturation region, regulates on-load transformer tap changer.
Described minimum trigger angle α
minGet 5 °, described maximum Trigger Angle α
maxGet 12 °.
The concrete grammar that on-load transformer tap changer is regulated in described step (2) is as follows:
Step 301 when the thyristor Trigger Angle reaches in limited time, is regulated on-load transformer tap changer and is raise one grade; When the thyristor Trigger Angle reaches in limited time lower, regulate on-load transformer tap changer and reduce by one grade;
Step 302 after executing the operation of lifting shelves, then continues judgement thyristor Trigger Angle operation interval of living in, when the thyristor Trigger Angle reaches upper and lower limit, returns to step 301, until the thyristor Trigger Angle is in linear section.
In step (1), the voltage that the on-load transformer tap changer adjusting is one grade is differential less than the thyristor Trigger Angle pressure regulation degree of depth, and the pressure regulation degree of depth U value of thyristor Trigger Angle is by formula U=U
h-U
lObtain, wherein U
hFor the thyristor rectifier device Trigger Angle is minimum trigger angle α
minThe time dc voltage output, U
lFor the thyristor rectifier device Trigger Angle is maximum Trigger Angle α
maxThe time dc voltage output.
The present invention has the following advantages compared with prior art:
1, with the range of regulation section of Trigger Angle, definition and maximum, the minimum trigger angle of 3 operation intervals have been provided, can satisfy the requirement of the normal operation of actual scr rectification circuit like this, also can improve the power factor of commutation system, simultaneously the parameter of rectifying installation is chosen and proposed new standard, comprise that on-load transformer tap changer voltage is differential, the thyristor voltage regulation degree of depth etc.
2, the continuous adjusting of thyristor, control with the coordination of on-load transformer tap changer, effectively reduced the impact of the current break that anode effect, unit fault etc. bring, in the action frequency scope of constraint, greatly reduce the financial loss that fluctuation of current brings at on-load transformer tap changer.
Description of drawings
Fig. 1 is the schema of electrolytic aluminum current stabilization control method of the present invention.
Fig. 2 is the schematic diagram of potline current control of the present invention and the closed-loop control of unit group.
Fig. 3 is that under unit operating mode out of service, ULTC has or not and participates in coordinating the contrast schematic diagram controlled.
The schematic diagram of electric current output response when Fig. 4 is electrolyzer generation anode effect.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
For the thyristor rectifier unit, adopt the thyristor Trigger Angle as the sign of distinguishing each section, according to on-site actual situations, the range of regulation of Trigger Angle is divided into three sections: as α＜α
minThe time, Trigger Angle is in cut-off region; Work as α
min≤ α≤α
maxThe time, Trigger Angle is in linear section; As α＞α
maxThe time, Trigger Angle is in the saturation region.Although Trigger Angle pressure regulation variation and Trigger Angle are not linear, can characterize the residing scope of pressure regulation with the value of Trigger Angle.The Trigger Angle general control be 5 ° ~ 12 ° (actual condition can slightly be adjusted), and Trigger Angle is crossed conference, and to cause that the system harmonics electric current reaches greatly power utilization efficient low, too smallly is difficult to satisfy thyristor blow-out requirement, otherwise can cause commutation failure.
Fig. 1 is the schema that electrolytic aluminum current stabilization of the present invention is controlled, if during electrolytic aluminum power supply system generation anode effect etc., measure the potline current of this moment, obtain the deviation with set(ting)value, when deviation during greater than threshold value, directly regulate on-load transformer tap changer, positive and negative according to deviation determines that on-load transformer tap changer upgrades or lowers category.When deviation during less than threshold value, the deviation of potline current is averagely allocated to each unit, for unit group current stabilization Controlling System, when Trigger Angle is in linear section, regulate the thyristor Trigger Angle, until Trigger Angle reaches maximum constraints or minimum limit, then judge that on-load transformer tap changer upgrades or lowers category.
Fig. 2 is the schematic diagram of potline current control of the present invention and the closed-loop control of unit group, I
1, I
2..., I
nBe respectively unit 1,2 ..., the actual current value of n, I
setBe potline current deviation threshold, G
1(s), G
2(s) ..., G
n(s) PID that is respectively each unit group controls, α
maxBe the maximum constraints of thyristor Trigger Angle, α
minBe the minimum limit of thyristor Trigger Angle, T
dBe the on-load transformer tap changer action delay.
1: one unit of embodiment hinders out of service for some reason
Fig. 3 is for to hinder for some reason under operating mode out of service at a unit, and ULTC has or not the contrast schematic diagram that participates in coordinating control.Originally 4 machine set systems have 1 unit at t
0Constantly out of service, if participate in coordinating to control without ULTC, consider again the restriction of thyristor regulation range, this moment, every unit was still kept original working order, as shown in curve 1.If ULTC participates in coordinating to control, guaranteeing under the constant condition of load current 300kA, all the other 3 units are by former load current 300kA operation.This moment, this unit ULTC gear upgraded automatically to identical with other units according to the current stabilization condition.Trigger Angle has been in cut-off region, and this moment, ULTC participated in action, and by regulating tap, electric current also enters new working order soon, as shown in curve 2.
Embodiment 2: electrolyzer generation anode effect
When Fig. 4 is electrolyzer generation anode effect, the schematic diagram of electric current output response.Four unit commutation systems in embodiment 1, electrolyzer is at t
1Anode effect occurs constantly, and the moment change of electrolyzer direct current resistance is large, until t
2Constantly recover, cell resistance is got back to normal value.Control and the coordinating of trigger angle control by tap-change operation, galvanic current is controlled in the range of set value of electric current effectively, and the galvanic current error reduces greatly.
The above; show and described ultimate principle of the present invention, principal character and advantage; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement are within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (6)
1. the method that the electrolytic aluminum current stabilization is controlled, is characterized in that, comprises the following steps:
At first step (1) when electrolyzer generation anode effect or generating set are under the operating mode of fault, maintenance, judges whether the actual measured value of potline current and the deviation of set(ting)value surpass predefined threshold value:
When result is yes, preferentially regulate on-load transformer tap changer, until above-mentioned deviation less than threshold value, enters step (2); When result is no, directly enter step (2);
Step (2) judges whether the thyristor Trigger Angle in generating set is in linear section, is handled as follows:
If A thyristor Trigger Angle this moment is in linear section, regulate the thyristor Trigger Angle, until anode effect
Or fault disappears;
If B thyristor Trigger Angle this moment is in cut-off region or saturation region, regulate on-load transformer tap changer, until the thyristor Trigger Angle is in linear section, return to steps A.
2. a kind of electrolytic aluminum current stabilization control method as claimed in claim 1, is characterized in that, the concrete grammar of regulating on-load transformer tap changer in described step (1) is as follows:
When Δ I＞0 and | Δ I|＞I
setThe time, regulate on-load transformer tap changer, carry out the operation that lowers category;
When Δ I＜0 and | Δ I|＞I
setThe time, regulate on-load transformer tap changer, carry out upshift operation;
Wherein, Δ I is the actual measured value of potline current and the deviation of set(ting)value, I
setBe the threshold value of setting.
3. a kind of electrolytic aluminum current stabilization control method as claimed in claim 1, is characterized in that, described step (2) is specific as follows:
For the thyristor rectifier unit, adopt thyristor Trigger Angle α as the sign of distinguishing each section, determine minimum trigger angle α according to the blow-out requirement of thyristor
min, require to determine maximum Trigger Angle α according to the output power factor
max
Work as α
min≤ α≤α
maxThe time, Trigger Angle is in linear section, regulates the thyristor Trigger Angle in the thyristor rectifier unit, and described Trigger Angle regulation range is α
min~ α
max
As thyristor Trigger Angle α＜α
minThe time, Trigger Angle is in cut-off region, regulates on-load transformer tap changer;
As α＞α
maxThe time, Trigger Angle is in the saturation region, regulates on-load transformer tap changer.
4. a kind of electrolytic aluminum current stabilization control method as claimed in claim 3, is characterized in that: described minimum trigger angle α
minGet 5 °, described maximum Trigger Angle α
maxGet 12 °.
5. a kind of electrolytic aluminum current stabilization control method as described in claim 1 or 3, is characterized in that, the concrete grammar that on-load transformer tap changer is regulated in described step (2) is as follows:
Step 301 when the thyristor Trigger Angle reaches in limited time, is regulated on-load transformer tap changer and is raise one grade; When the thyristor Trigger Angle reaches in limited time lower, regulate on-load transformer tap changer and reduce by one grade;
Step 302 after executing the operation of lifting shelves, then continues judgement thyristor Trigger Angle operation interval of living in, when the thyristor Trigger Angle reaches upper and lower limit, returns to step 301, until the thyristor Trigger Angle is in linear section.
6. on-load transformer tap changer control method as claimed in claim 5, it is characterized in that: in step (1), the voltage that the on-load transformer tap changer adjusting is one grade is differential less than the thyristor Trigger Angle pressure regulation degree of depth, and the pressure regulation degree of depth U value of thyristor Trigger Angle is by formula U=U
h-U
lObtain, wherein U
hFor the thyristor rectifier device Trigger Angle is minimum trigger angle α
minThe time dc voltage output, U
lFor the thyristor rectifier device Trigger Angle is maximum Trigger Angle α
maxThe time dc voltage output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310041660XA CN103103569A (en) | 2013-02-04 | 2013-02-04 | Electrolytic-aluminium stabilized current control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310041660XA CN103103569A (en) | 2013-02-04 | 2013-02-04 | Electrolytic-aluminium stabilized current control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583010A (en) * | 2020-12-15 | 2021-03-30 | 云南电网有限责任公司 | Method and device for determining equivalent parameters of electrolytic load rectified by thyristor |
| US12021380B1 (en) * | 2023-03-23 | 2024-06-25 | SPIC Yunnan International Power Investment Co., Ltd. | Electrolytic aluminum system based on flexible dc microgrid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2401325C1 (en) * | 2009-06-03 | 2010-10-10 | Александр Иванович Громыко | Device to control current distribution in aluminium electrolyser anode assembly |
| CN102677097A (en) * | 2012-05-30 | 2012-09-19 | 国电南瑞科技股份有限公司 | Flow-stabilizing fault tolerance control method of aluminum electrolyzation power supply |
| CN102851703A (en) * | 2012-10-09 | 2013-01-02 | 国电南瑞科技股份有限公司 | Intelligent automatic voltage regulation optimized control method for electrolytic aluminum power supply system |
-
2013
- 2013-02-04 CN CN201310041660XA patent/CN103103569A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2401325C1 (en) * | 2009-06-03 | 2010-10-10 | Александр Иванович Громыко | Device to control current distribution in aluminium electrolyser anode assembly |
| CN102677097A (en) * | 2012-05-30 | 2012-09-19 | 国电南瑞科技股份有限公司 | Flow-stabilizing fault tolerance control method of aluminum electrolyzation power supply |
| CN102851703A (en) * | 2012-10-09 | 2013-01-02 | 国电南瑞科技股份有限公司 | Intelligent automatic voltage regulation optimized control method for electrolytic aluminum power supply system |
Non-Patent Citations (1)
| Title |
|---|
| 牛玉娟: "河南中孚300KA级铝电解稳流控制系统的研究与应用", 《中南大学硕士学位论文》, 31 January 2011 (2011-01-31) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112583010A (en) * | 2020-12-15 | 2021-03-30 | 云南电网有限责任公司 | Method and device for determining equivalent parameters of electrolytic load rectified by thyristor |
| CN112583010B (en) * | 2020-12-15 | 2023-03-24 | 云南电网有限责任公司 | Method and device for determining equivalent parameters of electrolytic load rectified by thyristor |
| US12021380B1 (en) * | 2023-03-23 | 2024-06-25 | SPIC Yunnan International Power Investment Co., Ltd. | Electrolytic aluminum system based on flexible dc microgrid |
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Application publication date: 20130515 |