EP2289161A1 - Circuit redresseur a forte puissance notamment pour électrolyse de l'aluminium - Google Patents
Circuit redresseur a forte puissance notamment pour électrolyse de l'aluminiumInfo
- Publication number
- EP2289161A1 EP2289161A1 EP09753921A EP09753921A EP2289161A1 EP 2289161 A1 EP2289161 A1 EP 2289161A1 EP 09753921 A EP09753921 A EP 09753921A EP 09753921 A EP09753921 A EP 09753921A EP 2289161 A1 EP2289161 A1 EP 2289161A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rectifier
- bridge
- transformer
- rectifier bridge
- voltage
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/19—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only arranged for operation in series, e.g. for voltage multiplication
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/16—Electric current supply devices, e.g. bus bars
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/10—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
Definitions
- the present invention relates to a high power rectifier circuit especially for the electrolysis of aluminum.
- the tanks in which the electrolysis of aluminum is carried are traversed by a continuous current of very high intensity of the order of 350,000 amperes for a voltage of 4 volts, many tanks being fed in series. This current value is reached gradually from the start.
- the high power rectifier circuit could of course be used to power anything other than electrolysis cells, for example electric arc furnaces or plasma generators which also require high power.
- the tank feed is supplied by the three-phase AC high-voltage power grid R.
- the three-phase alternating current of the network R passes through a rectifying circuit such as that illustrated in FIG. 1.
- This circuit comprises, from the three-phase alternating network R, a three-phase transformer or auto-transformer 2 provided on the secondary side with a regulator in charge by sockets (known by the acronym OLTC for "on line tap change"), this secondary powering a three phase rectifier transformer 3.
- the expression regulator transformer 2 for the transformer or the autotransformer with the regulator in charge will be used later. It should be noted that such a load adjuster mounted at the primary of a transformer increases the design power of the transformer while such a secondary-mounted adjuster would not increase its design power. A secondary regulator of the rectifier transformer 3 would be unrealistic given the current levels. But the adjuster can perfectly be the secondary of the trimmer transformer 2.
- a three-phase transformer has at least one primary per phase and at least one secondary per phase, these primaries can be mounted for example in a triangle or star.
- the rectifier transformer 3 comprises two three-phase primary 3.1 connected to the secondary of the regulating transformer and two three-phase secondary 3.2.
- the two secondary 3.2 of the transformer rectifier 3 are connected to a rectifying bridge 4 dodecaphasic parallel.
- each three-phase secondary 3.2 is connected to a semiconductor semiconductor semiconductor three-phase bridge and the two bridges are connected in parallel continuous side.
- Each of the bridges is of the Graetz bridge type.
- This 12-phase rectifier bridge is represented as having diodes.
- Self-saturable reactances 5 are inserted between the two secondarys 3.2 of the rectifier transformer 3 and the rectifier bridge 4, making it possible to rapidly adjust the DC voltage, but with a small amplitude to limit the size of the reactances, the adjustment of the large amplitudes being ensured. by the regulator transformer, but in a slower manner and by successive studs.
- the rectifier bridge 4 supplies direct current, an electrolysis installation or series of electrolysis (not shown specifically) or any other user device 10.
- Switching means 6 are inserted between the three-phase electrical network R and the primary of the transformer provided with the Adjuster 2.
- a four-phase thyristor pulse bridge is sometimes used, which makes it possible to dispense with the self-saturable reactances 5 and to reduce the number of taps taken by the adjuster.
- the thyristors are able to quickly adjust the DC voltage over the entire voltage range from 0 volts, but while consuming a prohibitive reactive power, while the adjuster allows this setting, without reactive power consumption but more slowly.
- the primary of the regulating transformer 2 may be equipped with a tertiary 8 three-phase connected via protective switch means 9 to a three-phase compensation / filtering battery 7 with one or more branches in parallel, comprising for each branch a capacitor C in series with a inductance L and possibly a damping resistor (not shown).
- the compensation-filtering battery 7 may be star-shaped, only one branch being shown in FIG. 1.
- the compensation-filtering battery 7 simultaneously performs the functions of compensation of the reactive power and harmonic filtering.
- Another compensation-filtering battery of the same type could also be provided at the high voltage level.
- a single circuit such as that shown in FIG. 1 is not sufficient, even by arranging several thyristors in parallel to form one of the six functional components of the Graetz bridges.
- Several circuits, called groups, are then used in parallel, these groups being out of phase with each other in order to eliminate the harmonics more completely.
- phase shifts are usually made at the primary level of the regulating transformers by zigzag couplings.
- phase shifts are to have to use different regulating transformers, especially at the level of the leakage lines, and requiring more spares.
- the AC voltage supplied by the regulating transformer 2 increases, saturating the self-saturable reactances 5.
- the current delivered by the rectifier circuit increases until the self-saturable reactances 5 no longer saturated.
- the regulator transformer 2 stabilizes.
- the variations in current delivered by the rectifier circuit due to the three-phase electrical network or to the user device are first controlled rapidly by the self-saturable reactances 5, with a limited amplitude, and then by the regulating transformer 2.
- the disadvantage of this rectifier circuit is that all the power required by the user device passes through both the trimmer transformer and the rectifier transformer, so that these transformers are very bulky and they can not be in a common tank. This congestion notably poses transport problems at the time of installation.
- Another disadvantage is that technological limits appear at the fuses of the diodes or thyristors used in the rectifier bridges, these limits being related to the increase of the rectified voltages.
- Three-phase rectifier circuits with a single transformer associated with at least one rectifier bridge are known.
- the transformer has two three-phase secondaries, each of them being connected to a thyristor-type hexaphase bridge rectifier.
- the primary of the transformer is directly connected to the three-phase electricity network. All the power goes through the transformer.
- the present invention has as its main object to provide a rectifying circuit capable of passing very high power, which does not have the disadvantages of space and cost mentioned below and which allows to deliver variable voltages so as to adjust the current value according to the needs of the user device that it contributes to power.
- the need for rapid adjustment and in charge of the DC voltage results from variations of the high voltage, at most ⁇ 10%, and variations due to the electrolysis process. about 50 volts, about 5% of the total voltage since all the tanks are in series.
- the basic idea is to eliminate the regulating transformer and to use several transformers cooperating with rectifier bridges so that the power is distributed between them, the rectifier bridges being connected in series on the continuous side, one being a thyristor and the other or the other diodes, each diode rectifier bridge can operate freewheel and deliver a voltage substantially zero.
- the present invention proposes a three-phase rectifying circuit comprising two or more transformers intended to be connected in parallel on the primary side to an alternating and secondary electrical network, each having at least one semiconductor rectifier bridge, the rectifier bridges. connected to different transformers being connected in series on a continuous side and being intended to continuously supply a user device.
- One of the rectifier bridges is thyristors and the remaining rectifier bridges are diodes, the diode rectifier bridge or the set of diode rectifier bridges providing a voltage greater than that provided by the rectifier bridge thyristors. It further comprises a switch means associated with each diode rectifier bridge, comprising a pair of disconnectors, operating in opposition, connected on the DC side to the diode rectifier bridge, making it possible in a freewheeling position to isolate the diode rectifier bridge.
- thyristor rectifier bridge and, in another position to put it in series with the thyristor rectifier bridge so that the rectifier bridge operates as a rectifier, in the freewheeling position, current flows in one of the disconnectors of the pair which bypassed the rectifier bridge with diodes and not in the other nor in the rectifier diode bridge.
- a transformer connected to a diode rectifier bridge prefferably equipped with voltage divider means so that the diode rectifier bridge to which it is connected delivers either a full voltage or a fraction of the full voltage.
- the voltage divider means may comprise a pair of disconnectors, per phase, and the transformer may comprise a primary formed of two identical primary windings, the pair of disconnectors being able to put in series the two primary windings so that the diode rectifier bridge delivers one half of the full voltage or in parallel so that the diode rectifier bridge delivers the full voltage.
- the voltage divider means may comprise a non-load regulator with two sockets, per phase, mounted at the secondary of the transformer.
- the transformers have secondary phase shifted by 30 ° by appropriate couplings at their secondary or primary
- the rectifier bridges may each comprise a first and a second rectifier bridge hexaphase, the first rectifier bridges hexaphase are all mounted in a first series assembly, the second rectifier bridges all being mounted in a second series assembly, the first series assembly and the second series assembly being connected in parallel.
- a twelve-phase transformer may comprise two primary and two tertiary compensation, the two tertiary compensation being connected in series and feed a single filter compensation battery.
- the present invention also relates to a set of two rectifier circuits thus characterized, with 12-phase rectifier bridges, in which the transformers of a rectifier circuit are identical to the transformers of the other rectifier circuit and in which the primary of the transformers are out of phase with the current.
- the present invention also relates to a control precursor of a rectifier circuit thus characterized comprising, to make it work, the steps of: a) connecting the user device to the rectifier circuit and the transformer connected to the thyristor rectifier bridge to the network but not the transformer or transformers connected to a diode rectifier bridge, b) regulating the current flowing in the user device by controlling the thyristors of the thyristor rectifier bridge, c) when the voltage required by the user device exceeds the maximum voltage that can be supplied by the thyristor rectifier bridge, to control thyristors of the thyristor rectifier bridge to minimize the current in the device user, the disconnector which when closed shorts the rectifier bridge with diodes, being open and the other disconnector of the couple being closed, d) connect to the network a transformer connected to a rectifier bridge with diodes, if the transformer connected the diode rectifier bridge is equipped with voltage divider means, the latter being positioned beforehand so that the transformer delivers the voltage
- the method also includes, for stopping the operation of the rectifier circuit, the steps of: m) controlling the thyristors of the thyristor rectifier bridge to minimize the current in the user device, n) disconnect from the network any transformer connected to a diode rectifier bridge then the transformer connected to the thyristor rectifier bridge o) disconnect the user device from the rectifier circuit.
- the present invention also relates to the use of a rectifier circuit thus characterized, with as user device one or more aluminum electrolysis cells.
- the present invention also relates to the use of a set of rectifier circuits thus characterized, with as user device one or more series of aluminum electrolysis cells.
- the present invention also relates to the use of a method thus characterized with one or more series of aluminum electrolysis cells as a user device.
- Figure 1 is a diagram of a rectifying circuit of the prior art
- Figure 2A is a diagram of a first variant of a rectifying circuit of the invention.
- FIG. 2B is a diagram of a second variant of a rectifying circuit of the invention
- Figure 3 is a more detailed diagram of the rectifier bridges shown in Figures 2A and 2B
- FIGS. 4A, 4B illustrate a variant of a primary phase of the transformer connected to a diode rectifier bridge of FIGS. 2A, 2B, this primary being equipped with voltage divider means and being respectively in a series assembly and in a mounting parallel;
- FIG. 4C illustrates a variant of a secondary phase of the transformer connected to a diode rectifier bridge of FIGS. 2A, 2B, this secondary being equipped with voltage divider means;
- FIG. 5 shows the shape of the voltage delivered by the rectifier circuit according to the variants of FIGS. 4A to 4C as a function of the mode of operation of the transformer connected to the diode rectifier bridge;
- FIG. 6A shows another variant of a rectifying circuit of the invention
- FIG. 6B shows a further variant of a rectifier circuit according to the invention with three transformers connected to rectifier bridges;
- FIG. 7 is a diagram of a variant of the transformer connected to the thyristor bridge of Figure 6A whose primary are equipped with tertiary;
- FIG. 8 represents a set of two twelve-phase rectifier circuits (12 pulses) constituting a set with 24 pulses.
- FIG. 2A schematically shows a first example of a three-phase rectifier circuit according to the invention. It comprises two transformers TR1 and TR2 intended to be connected on the primary side P1, P2 each to the same three-phase AC electrical network R. Secondary side S1, S2, each of the transformers TR1, TR2 is connected to at least one semiconductor rectifier bridge PR1, PR2.
- the semiconductor rectifier bridges PR1, PR2 are connected in series, they are intended to supply a user device 10, such as one or more series of aluminum electrolysis cells.
- One of the rectifier bridges referenced PR1 is connected to the positive terminal + of the user device 10, the other rectifier bridge referenced PR2 to the negative terminal.
- the user device could be different, for example an arc furnace or a plasma furnace.
- each transformer TR1, TR2 is connected to a single hexaphase rectifier bridge PR1, PR2.
- each transformer TR1, TR2 comprises a secondary Sl, S2 comprising at least one winding per phase.
- one of the rectifier bridges PR1 is thyristors Thy and the other referenced PR2 is diode d.
- diode rectifier bridge is meant a rectifier bridge whose semiconductor components are of the family of diodes or function as diodes. Thus the diodes could be replaced by thyristors controlled so that they function as diodes.
- a thyristor rectifier bridge means a rectifier bridge whose semiconductor components are in the family of thyristors or function as thyristors.
- the number of transformer and diode rectifier assemblies may be greater than one as shown in Figure 6B described later.
- the rectifying bridge PR1 thyristors is intended to provide a voltage whose amplitude is adjustable quickly and charged by the control thyristors.
- the diode rectifier bridge or bridges are intended to provide a rectified voltage whose amplitude is constant. But this voltage can be changed out of charge or at low load. We will describe the means to obtain this change later.
- each of the rectifying bridges PR1, PR2 is illustrated. These are classic Graetz bridges hexaphase. Their series assembly is clearly visible. The tensions that feed each of arm of a bridge are alternating voltages out of phase by 60 °.
- the primers P1, P2 of the transformers TR1, TR2, high voltage side are preferably mounted in a star and the secondary S1, S2, low voltage side, are preferably mounted in a triangle.
- each transformer TR1, TR2 is connected to the three-phase electrical network R via input switch means II, 12, 13.
- a switch means associated with the transformer TR1 connected to the rectifier bridge with thyristors PR1 is referenced II, it makes it possible to disconnect it from the network R.
- the referenced switch means 12, associated with the rectifier bridge with diodes PR2 and connected to a transformer TR2 connected to a rectifier bridge with diodes PR2 makes it possible to operate the rectifier bridge with diodes PR2 in freewheel.
- the switch means 13 is optional, it makes it possible to disconnect the rectifier circuit R.
- Each switching means II, 12, 13 comprises a circuit breaker per phase.
- FIGS. 2A, 2B which represent only one phase, only one of the circuit breakers II, 12, 13 of each of the switch means is seen.
- the three circuit breakers II, 12, 13 have a common end, the first 13 having its other end connected to the three-phase electrical network R, the second one having its other end connected to the primary P1 of the transformer TR1, the third 12 having its other end connected at primary P2 of transformer TR2. If the circuit breaker 13 is omitted, the common end of the circuit breakers 12 and 13 is connected directly to the network R.
- a compensation-filtering battery F1, F2 is connected to each tertiary compensation T1, T2.
- This compensation-filtering battery F1, F2 comprises one or more branches connected in parallel, preferably in a star, each branch comprising in series an inductance L1, L2 and a capacitor C1, C2 per phase and optionally a damping resistor (not represented).
- Switching means 110, 120 are inserted between each tertiary compensation T1, T2 and each compensation-filtering battery F1, F2.
- the switch means 110, 120 are formed, for each transformer, a switch per phase.
- FIG. 2B The variant of FIG. 2B is identical to that of FIG. 2A, except that on the network side R only the switch means 13 for disconnecting the rectifier circuit of the network R are present. It comprises a circuit breaker 13 phase, mounted between the network R and the primary P1, P2 transformers TR1, TR2. Only one circuit breaker per phase is sufficient.
- the switch means for operating each PR2 diode rectifier bridge freewheel is directly associated with the diode rectifier bridge PR2 because it placed on the DC side. It comprises a pair of disconnectors 14, 15 whose disconnectors operate in opposition.
- One of the disconnectors 14 is mounted between the rectifying bridge PR2 with diodes, on the user device side 10, and the negative terminal of the user device 10 and the other disconnector 15 is mounted between the rectifying bridge PR2 with diodes, reclining bridge side PR1 to thyristors, and the negative terminal of the user device 10.
- the PR2 diode rectifier bridge or bridges as a whole provide a voltage greater than that provided by the rectifier bridge with thyristors PR1. This reduces the reactive power, the harmonics returned to the network and the undulation of the DC currents.
- FIGS. 4A, 4B show two configurations of a primary phase of the transformer TR2 connected to the rectifier bridge PR2 diodes illustrated in Figures 2A, 2B.
- Each phase of the primary comprises two windings P2, P2 'capable of being connected either in series or in parallel by switching means MC.
- the windings are identical.
- the switching means MC are formed of two inverter switches 16 and 16 '.
- FIG. 4C shows a secondary phase of transformer TR2 connected to the bridge rectifier PR2 diode shown in Figures 2A, 2B and it comprises a secondary winding S2 equipped with switching means MC of the type off-load controller with two sockets, taking the form of an inverter switch 17.
- This off-load regulator two outlets 17 allows in one position to divide the maximum voltage that can deliver the transformer TR2 and in another position to the transformer TR2 to deliver the full voltage.
- One of the sockets is at one end of the secondary winding S2 and the other taken along the secondary winding S2 in the middle. Such an arrangement makes it possible to have either the full voltage or a fraction of the full voltage, this fraction of the full voltage may be half or not.
- the switching means MC allowing, in one position, to divide in half the voltage delivered by the transformer TR2 connected to the rectifier bridge with diodes PR2 and, in another position to let it deliver the full voltage, are not mandatory on transformers connected to diode rectifier bridges as the rectifier circuit several transformers connected to diode rectifier bridges as in Figure 6B.
- FIG. 5 such a rectifier circuit in the example of Figures 2A, 2B or 6A (which will be described in more detail later).
- the user device 10 is connected to the rectifier circuit which is the subject of the invention, on the rectifier bridge side PR1, PR2.
- the transformer TR1 connected to the thyristor rectifier bridge PR1 will be connected to the network R, but not the transformer TR2 connected to the rectifier bridge with diodes PR2.
- the transformer TR2 connected to the diode rectifier bridge PR2 is positioned to deliver a half voltage if it conforms to that of the variants of FIGS. 4A, 4B or 4C.
- Switches II, 13 of the switch means are open in the configurations of Figures 2A, 2B.
- the switch 12 is open in the configuration of Figure 2A.
- the disconnector 14 is open and the disconnector 15 is closed in the configuration of Figure 2B.
- transformers TR1, TR2 and the rectifier bridges PR1, PR2 are sized so that the rectifier bridge with diodes PR2 cooperating with the switching means MC in their variant of FIGS. 4A, 4B or 4C can deliver either a full voltage a voltage of half, the full voltage being equal to about two thirds of the maximum voltage Umax necessary for the user device 10, and the half voltage being equal to about one third of the maximum voltage Umax.
- the voltage delivered by the thyristor rectifier bridge PR1 can be increased from 0 to approximately 1/3 of Umax as a function of the thyristor control.
- the thyristors of the rectifier bridge PR1 are controlled so as to reduce as much as possible the current in the user device 10.
- circuit breaker 12 is closed at time t2.
- circuit breaker 13 is opened, then the disconnector 15, then the disconnector 14 is closed, then the circuit breaker 13 at time t2.
- the transformer TR2 connected to the diode rectifier bridge PR2 is then energized.
- the rectifier bridge with diodes PR2 delivers a half tension.
- the supply voltage of the user device 10 is about 1/3 of Umax.
- the thyristors of the rectifier bridge PR1 are controlled so as to minimize the current in the user device 10.
- the circuit-breaker 12 is opened, the transformer TR2 is positioned so that it delivers the full voltage by acting on the switching means MC or on the off-load regulator with sockets 17 and then closing the circuit breaker 12 at time t3.
- the circuit breaker 13 is opened, the transformer TR2 is positioned to deliver the full voltage by acting on the switching means MC or on the off-load regulator with sockets 17, then, the disconnector 14 remaining closed and the disconnector 15 open, the circuit breaker 13 is closed at time t3.
- the rectifier bridge with diodes PR2 then delivers about 2/3 of Umax.
- the thyristors of the thyristor rectifier bridge PR1 can then be controlled so that the supply current of the user device can increase.
- the transition control sequence of the transformer TR2 from its voltage half to its full voltage must be done as quickly as possible so as to retain, if necessary, the counter electromotive force in the user device 10. If this counter-electromotive force has Too much decreased due to too long downtime, it may be necessary to add a "recharge" sequence of this counter-electromotive force using a lower voltage range before moving to the desired higher voltage range.
- the transformer TR1 and the thyristor rectifier bridge PR1 are still active. They allow the DC voltage to be set quickly and continuously in the user device 10 in all ranges. The transition from one range to the other at the level of the diode rectifier bridges takes place without load.
- the ever-present thyristor rectifier bridge TRl ensures fast adjustment and charging with limited reactive power.
- the transformer TR2 and the diode rectifier PR2 operate in three modes corresponding to the three voltage ranges: freewheel providing a rectified voltage close to 0 volts, at half tension and at full voltage.
- the thyristors of the thyristor rectifier bridge PR1 are first controlled to minimize the current in the user device.
- a transformer connected to a diode rectifier bridge acting on the switch means is disconnected from the network R, that is to say by opening the circuit breaker 12 or the disconnector 14.
- the transformer TR1 connected to the thyristor rectifier bridge PR1 of the transformer is disconnected. network by acting on the switch means II and 13 (if the latter is present), that is to say by opening the disconnectors II and possibly 13.
- the user device 10 of the rectifier circuit is disconnected.
- the rectifier bridges instead of being hexaphase to be twelve-phase with a single thyristor rectifier bridge and one or more PR2 diode rectifier bridges.
- Such rectifier bridges make it possible to reduce the ripple rate on the output current and to limit mainly the amplitude of the harmonics of rank five and seven reinjected on the network.
- the voltages that supply each of the arms of a rectifier bridge PR1 or PR2 are alternating voltages phase shifted by 30 °.
- FIG. 6A which shows the rectifying circuit of the invention in this latter twelve-phase configuration. In this example, there is only one PR2 diode rectifier bridge, but there could be several.
- each twelve-phase rectifier bridge PR1 or PR2 is formed of a first PR1.1 PR2.1 hexaphase rectifier bridge and a second hexaphase rectifier bridge PRl.2, PR2.2. All the first rectifier bridges PRl.1, PR2.1 are mounted in a first set PESl series. All second rectifier bridges PR1.2, PR2.2 are mounted in a second set PES2 series. The first set PESl series and the second set PES2 series are mounted in parallel. Twelve-phase rectifier bridges of this nature do not pose a problem to a person skilled in the art.
- each of the transformers TR1, TR2 has a pair of secondary S1 and S1 ', S2 and S2', phase shifted by 30 °, which can be achieved by different couplings to the primary or in high school.
- the example of FIG. 6A represents the simplest of these couplings: each of the transformers TR1, TR2 has only one star primary P1, P2 and two secondary ones, one of which is referenced S1, S2 is in a triangle and the other is referenced S1. ', S2' is in star.
- FIG. 6A the switch means 12 enabling free-wheel operation of the diode rectifier bridge PR2 are illustrated as in the variant of FIG. 2A. It is of course possible to use the configuration illustrated in Figure 2B with the disconnecting couple in opposition continuous side.
- FIG. 6A there is no representation of tertiary compensation and their compensation-filtering batteries, but there is no disadvantage in introducing them as in FIGS. 2A, 2B. As already indicated, they are optional and it is sometimes preferred to use compensation-filtering batteries connected to the electrical network R.
- FIG. 6B shows a rectifying circuit according to the invention with always a transformer TR1 connected to a rectifier bridge with thyristors PR1 but with several transformers TR2, TR3, (in example two), each connected to a bridge rectifier with diodes PR2, PR3.
- the transformers TR2, TR3 are connected in parallel on the network side 10.
- the diode rectifier bridges PR2, PR3 are connected in series with each other and with the thyristor rectifier bridge PR1 on the user device 10.
- To operate the rectifier circuit is carried out as described above, with a first transformer connected to a first diode rectifier bridge. As soon as the user device needs more voltage, another one is connected after having reduced the current in the user device by controlling the thyristors.
- FIG. 7 illustrates a clever arrangement of two tertiaries T1, T1 'of a transformer TR1 connected to a rectifier bridge with thyristors PR1.
- the transformer TR1 comprises two primary P1, P1 and two secondary S1, S1 '.
- the tertiary two Tl, Tl ' have the same coupling, star in the example. They are connected in series which requires opening the star of one of them, the one called Tl '.
- the set of two tertiaries T1, T1 ' feeds a single filtering-filtering battery F which then only supports the phase harmonics, of ranks 11, 13, 23, 25, etc., but not the harmonics in phase opposition.
- FIG. 8 illustrates a rectifier assembly comprising two twelve-phase rectifier circuits or groups G1, G2, 15 ° out of phase, which gives an overall harmonic reaction at 24 pulses.
- the harmonics of rank 11 and 13 that remained in the twelve-phase assemblies described above are eliminated and the first harmonics that remain have the ranks 23 and 25.
- the advantage of such a rectifier assembly is that the transformers TRl.1, TR2.1 TR1.2, TR2.2 of both groups are physically identical.
- Transformers TRl.1, TRl .2 connected to thyristor rectifier bridges PRIa, PRIb, PRIc, PRId have two primaries, named respectively Pl.1, Pl.2 and Pl.1 ', Pl.2' and two secondary named respectively Sl.1, Sl.2 and Sl.1 ', Sl.2'.
- Transformers TR2.1, TR2.2 connected to diode rectifier bridges PR2a, PR2b, PR2c, PR2d each have a primary element named P2, P2 ', respectively.
- the primers Pl.1, Pl.2, Pl.1 ', Pl.2' of transformers TRl.1, TRl .2 connected to thyristor rectifier bridges PRIa, PRIb, PRIc, PRId are respectively coupled in zigzag and triangle zigzag to obtain at the same time the phase shift of 30 ° between the two secondary Sl.1, Sl.2, Sl.1 ', Sl.2' and a phase shift of 7.5 ° between each transformer TRl.1, TRl .2 and the network R and two network phases are switched on one of the two groups G1, G2, which reverses the direction of the phase shift.
- One of the groups is out of phase compared to the network of + 7.5 ° and the other of -1.5 °, or 15 ° between the two groups G1, G2.
- FIG. 8 The diagram of FIG. 8 must be completed, according to the invention, by the switch means allowing the freewheeling operation of the diode rectifying bridges PR2a, PR2b, PR2c, PR2d, using either the variant of FIGS. 2A or 6, or that of Figure 2B.
- An advantage of the rectifier circuit according to the invention is its lower cost since the high voltage side support regulator illustrated in FIG. 1 is no longer used and the sizing power of the transformers is lower.
- Another advantage is that the transport and installation of the transformers are facilitated, their size being smaller.
- the suppression of the self-saturable reactants 5 of FIG. 1, normally integrated in the transformers 3, implies that the Transformers used in the rectifier circuit according to the invention are more conventional transformers whose supply is much easier since a greater number of suppliers offer this type of transformer.
- Yet another advantage of the rectifier circuit of the invention is that the DC voltage delivered can be increased without being limited by the fuse technology of diodes or thyristors which are conventionally equipped rectifier bridges. This was not the case in the prior art since all the power passed through the same bridge rectifier.
- Another advantage is to reduce the harmonics produced, on the one hand because the switching times of the diode rectifier bridges are longer, on the other hand because the harmonics of the two rectifier bridges are not in phase, which allows use identical transformers for parallel circuits.
- the undulations of the DC currents are also reduced because a diode rectifier bridge generates much less ripples than a thyristor rectifier bridge, which reduces the disturbances with respect to the environment in the structures related to the magnetic field of the electromagnetic fields. continuous busbars.
- Another advantage is the control of the rectifier circuit in its fast regulation and charging range, which is much simpler than in the past.
- the previous structure used two coordinated means on the one hand the regulator transformer equipped with the on the other hand, the self-saturable reactants or the thyristors.
- the rectifier circuit according to the invention uses only one control means, the ignition of the thyristors of the rectifier bridge TR1. This results in fewer studies and a much simpler exploitation.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Rectifiers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0853524A FR2932033B1 (fr) | 2008-05-29 | 2008-05-29 | Circuit redresseur a forte puissance notamment pour electrolyse de l'aluminium |
PCT/EP2009/056519 WO2009144266A1 (fr) | 2008-05-29 | 2009-05-28 | Circuit redresseur a forte puissance notamment pour électrolyse de l'aluminium |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2289161A1 true EP2289161A1 (fr) | 2011-03-02 |
Family
ID=40223717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09753921A Withdrawn EP2289161A1 (fr) | 2008-05-29 | 2009-05-28 | Circuit redresseur a forte puissance notamment pour électrolyse de l'aluminium |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2289161A1 (fr) |
FR (1) | FR2932033B1 (fr) |
WO (1) | WO2009144266A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102891613A (zh) * | 2011-07-21 | 2013-01-23 | 台达电子企业管理(上海)有限公司 | 一种ac-dc 电源转换器及其dc 充电站 |
CN103490649B (zh) * | 2013-10-17 | 2017-09-08 | 国家电网公司 | 可重复使用的直流融冰装置 |
DE102014000518A1 (de) * | 2014-01-15 | 2015-07-16 | Etogas Gmbh | Anordung zur Versorgung eines Elektrolyseurs mit Gleichstrom und Anlage zur Durchführung einer Elektrolyse |
WO2016012061A1 (fr) * | 2014-07-22 | 2016-01-28 | Siemens Aktiengesellschaft | Système d'électrolyse |
CN104805470B (zh) * | 2015-04-29 | 2017-05-31 | 酒泉钢铁(集团)有限责任公司 | 一种500kA电解铝直流电流与交流功率对应关系的验证方法 |
JP7096194B2 (ja) * | 2019-04-04 | 2022-07-05 | トヨタ自動車株式会社 | 直列接続された太陽電池又はその他の電源用の動作点制御回路装置 |
CN113037151B (zh) * | 2021-03-18 | 2023-04-14 | 恒大恒驰新能源汽车研究院(上海)有限公司 | 电机控制电路、方法及汽车 |
CN113064062A (zh) * | 2021-03-26 | 2021-07-02 | 广东电网有限责任公司 | 断路器二次回路的监测电路和装置 |
FR3123465A1 (fr) * | 2021-05-31 | 2022-12-02 | Energy Pool Developpement | Système de commande de redresseurs |
DE102022111107B4 (de) | 2022-05-05 | 2023-11-16 | Sma Solar Technology Ag | Energieversorgungsvorrichtung für eine Elektrolyseeinheit und Elektrolyseanlage |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0669291B2 (ja) * | 1982-05-24 | 1994-08-31 | 株式会社東芝 | 交直変換装置 |
JP2910616B2 (ja) * | 1995-04-27 | 1999-06-23 | 三菱電機株式会社 | 電圧源型電力変換装置 |
DE19808018C1 (de) * | 1998-02-26 | 1999-09-23 | Stn Atlas Elektronik Gmbh | Verfahren zur Steuerung eines Stromrichters |
KR20040037857A (ko) * | 2002-10-30 | 2004-05-08 | 한국전력공사 | 보조회로를 이용한 다-펄스 hvdc 시스템 |
US7528692B2 (en) * | 2006-04-14 | 2009-05-05 | Jonathan Paul Nord | Voltage stress reduction in magnetics using high resistivity materials |
-
2008
- 2008-05-29 FR FR0853524A patent/FR2932033B1/fr active Active
-
2009
- 2009-05-28 WO PCT/EP2009/056519 patent/WO2009144266A1/fr active Application Filing
- 2009-05-28 EP EP09753921A patent/EP2289161A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of WO2009144266A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009144266A1 (fr) | 2009-12-03 |
FR2932033A1 (fr) | 2009-12-04 |
FR2932033B1 (fr) | 2012-12-28 |
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