DE3813314A1 - Voltage supply for an electrostatic precipitator (filter) - Google Patents

Voltage supply for an electrostatic precipitator (filter)

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Publication number
DE3813314A1
DE3813314A1 DE19883813314 DE3813314A DE3813314A1 DE 3813314 A1 DE3813314 A1 DE 3813314A1 DE 19883813314 DE19883813314 DE 19883813314 DE 3813314 A DE3813314 A DE 3813314A DE 3813314 A1 DE3813314 A1 DE 3813314A1
Authority
DE
Germany
Prior art keywords
voltage
switched
primary
wave
power supply
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Withdrawn
Application number
DE19883813314
Other languages
German (de)
Inventor
Gerhard Dipl Ing Doenig
Walter Dipl Ing Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19883813314 priority Critical patent/DE3813314A1/en
Publication of DE3813314A1 publication Critical patent/DE3813314A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/257—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/2573—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 with control circuit
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/27—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 for conversion of frequency

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)

Abstract

The invention relates to a voltage supply for an electrostatic precipitator. The voltage regulator (2) which employs GTO thyristors is, for the purpose of reducing the reactive power demand, driven in such a way that the voltage-time areas switched through lie symmetrically with respect to the maximum (Umax) of the AC mains voltage (UN). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Spannungsversorgung für ein Elektrofilter mitThe invention relates to a power supply for an electrostatic filter with

  • a) einem an ein Wechselspannungsnetz angeschlossenen Primär­ kreis, in dem ein Wechselstromsteller mit schnell abschal­ tenden Leistungstransistoren oder GTO-Thyristoren in Reihe zur Primärwicklung eines Hochspannungstransformators ange­ ordnet ist unda) a primary connected to an AC network circuit in which an AC power controller with quick shuttering tendency power transistors or GTO thyristors in series to the primary winding of a high-voltage transformer is ordered and
  • b) einen Sekundärkeis, in dem das Elektrofilter über einen Gleichrichter mit der Sekundärwicklung des Hochspannungs­ transformators verbunden ist.b) a secondary circuit, in which the electrostatic filter has a Rectifier with the secondary winding of the high voltage transformer is connected.

Mit diesem Oberbegriff wird auf eine Spannungsversorgung Bezug genommen, wie sie beispielsweise aus der deutschen Patentschrift 33 08 411 bekannt ist. Bei dieser bekannten Anordnung können durch die Verwendung von GTO-Thyristoren, die über das Steuergitter ab­ schaltbar sind, in einem Kurzschlußfall sehr rasch das Filter vom Netz getrennt und damit Schäden verhütet werden.This generic term refers to a power supply taken, as for example from the German patent 33 08 411 is known. In this known arrangement can by the use of GTO thyristors that pass through the control grid are switchable, in a short circuit the filter very quickly disconnected from the network, thus preventing damage.

Anordnungen, bei denen die Thyristoren in bekannter Weise in Anschnittsteuerung betrieben werden, leiden daran, daß durch die Anschnittsteuerung ein Blindleistungsbedarf für das Netz entsteht.Arrangements in which the thyristors in a known manner Gate control operated, suffer from that by the gate control is a reactive power requirement for the network arises.

Die Aufgabe der vorliegenden Erfindung besteht darin, bei einer Spannungsversorgung der eingangs genannten Art den Kosinus ϕ, d.h. die induktive Blindleistungsanforderung an das Netz zu ver­ ringern.The object of the present invention is to reduce the cosine ϕ , ie the inductive reactive power requirement to the network, in the case of a voltage supply of the type mentioned at the outset.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Aus­ steuerung des Wechselstromstellers in jeder Halbwelle der Pri­ märwechselspannung so gewählt ist, daß sich die zur Primärwick­ lung durchgeschalteten Spannungs-Zeitflächen in etwa symme­ trisch zum Maximum der jeweiligen Spannungshalbwelle gruppieren.This object is achieved in that the off control of the AC power controller in each half-wave of the Pri is selected so that the primary winding  voltage-time areas connected through approximately symme group trically to the maximum of the respective voltage half-wave.

Von besonderem Vorteil ist es dabei, wenn eine Vielzahl von Spannungszeitflächen pro Halbwelle durchgeschaltet werden. Die Spannungszeitflächen sollten dabei hinsichtlich Dauer und Häufigkeit veränderbar sein, um den Spannungsverlauf jederzeit den gewünschten betriebsbedingten Forderungen anpassen zu kön­ nen.It is particularly advantageous if a large number of Voltage time areas are switched through per half-wave. The voltage time areas should be in terms of duration and Frequency can be changed to change the voltage curve at any time to be able to adapt to the desired operational requirements nen.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels sei die Erfindung näher beschrieben; es zeigen:Based on an embodiment shown in the drawing be the invention described in more detail; show it:

Fig. 1 der Prinzip der Schaltungsanordnung der Spannungsversor­ gung und Fig. 1 shows the principle of the circuit arrangement of the voltage supply and

Fig. 2 bis 4 verschiedene Spannungsverläufe aufgetragen über der Zeit. Fig. 2 to 4 different voltage curves plotted over time.

Wie aus Fig. 1 ersichtlich, ist an ein Wechselspannungsnetz 1 mit der Netzwechselspannung U N ein Wechselstromsteller 2 in Brückenschaltung angeschlossen. Die einzelnen Elemente dieser Brücke werden durch GTO-Thyristoren 3 oder im Ein-Ausbetrieb schaltbare Leistungstransistoren gebildet. Steller dieser Art sind bekannt. An den Steller 2 ist die Primärwicklung 5 eines Hochspannunungstransformators 4 angeschlossen, dessen Sekundär­ wicklung 6 über einen Gleichrichter 7 mit dem Elektrofilter 8 verbunden ist. Zusätzlich zu dem hier gezeigten Leistungsteil sind in an sich bekannter Weise Regel- und Schutzelemente vor­ zusehen, durch die abhängig von Filterstrom und/oder Filter­ spannung der Wechselstromsteller 2 entsprechend ausgesteuert wird. Diese erfaßten Filterwerte wie z.B. Primärstrom und/oder Sekundärspannung sind durch den Pfeil F angedeutet, der am Steuergerät 9 anliegt, welches die Zündbefehle für die einzel­ nen Thyristoren 3 liefert.As can be seen from FIG. 1, an AC power controller 2 is connected in a bridge circuit to an AC voltage network 1 with the AC network voltage U N. The individual elements of this bridge are formed by GTO thyristors 3 or power transistors that can be switched on and off. Actuators of this type are known. To the controller 2, the primary winding 5 is connected a Hochspannunungstransformators 4 whose secondary winding 6 via a rectifier 7 with the electrostatic filter 8 is connected. In addition to the power section shown here, control and protection elements are to be seen in a manner known per se, by means of which, depending on the filter current and / or filter voltage, the AC power controller 2 is appropriately controlled. These detected filter values such as primary current and / or secondary voltage are indicated by the arrow F , which is applied to the control unit 9 , which supplies the ignition commands for the individual thyristors 3 .

Die Ansteuerung der einzelnen Thyristoren 3 ist so gewählt, daß der aus jeder Netzspannungshalbwelle herausgeschnittene und an die Primärwicklung 5 angelegte Spannungsanteil in etwa symme­ trisch zum Maximum U max der Netzwechselspannung liegt. Wie aus Fig. 2 ersichtlich, kann dabei die Aussteuerung β so gewählt werden, daß je Spannungshalbwelle nur eine zusammenhängende Spannungszeitfläche durchgeschaltet wird, die symmetrisch zum Maximum liegt. Ebenso ist es aber auch möglich, Beginn und Ende jeder Spannungshalbwelle mit durchgeschalteten Spannungsantei­ len durch entsprechende Aussteuerung β/2 zu belegen (Fig. 3). Wesentlich ist in beiden Fällen, daß man durch die Verwendung von im Gitter abschaltbaren Thyristoren oder gegebenenfalls Transistoren davon frei ist, daß der Stromnulldurchgang zur Ab­ schaltung abgewartet werden muß.The control of the individual thyristors 3 is chosen so that the cut out of each line voltage half-wave and applied to the primary winding 5 voltage portion is approximately symmetrical to the maximum U max of the AC line voltage. As can be seen from FIG. 2, the modulation β can be selected such that only one contiguous voltage time area is switched through per voltage half-wave, which is symmetrical to the maximum. It is also possible, however, to occupy the beginning and end of each voltage half-wave with switched voltage components by appropriate modulation β / 2 ( FIG. 3). It is essential in both cases that one is free from the use of thyristors that can be switched off in the grid or, if appropriate, transistors, that the current zero crossing must be awaited for switching off.

Von besonderem Vorteil ist es, wenn nicht nur ein oder zwei Spannungszeitflächen durchgeschaltet werden, sondern wenn der Steller 2 kontinuierlich getaktet wird, wie beispielsweise Fig. 4 zeigt. Je nach dem verwendeten Puls-Pausen-Verhältnis bzw. der Zahl k der durchgeschalteten Spannungszeitflächen läßt sich eine beliebige gewünschte effektive Ausgangsspan­ nung U eff einstellen.It is particularly advantageous if not only one or two voltage time areas are switched through, but if the actuator 2 is clocked continuously, as shown for example in FIG. 4. Depending on the pulse-pause ratio used or the number k of the switched through voltage time areas, any desired effective output voltage U eff can be set.

Zusammengefaßt ergeben sich also durch die neue Anordnung folgende Vorteile:In summary, the new arrangement results following advantages:

Verbesserung des Netz-Kosinus- ϕ , relativ freizügige Ein­ stellung der Spannung und eine sehr schnelle Abschaltung im Kurzschlußfall vom treibenden Wechselspannungsnetz; z.B. ist bei einer hochfrequenten Taktung eine im Mikrosekundenbe­ reich liegende Abschaltung erreichbar. Durch diese Schnell­ abschaltung kann auch eine Vordrossel zur Netzstrombegrenzung entfallen oder stark verkleinert werden.Improvement of the network cosine ϕ , relatively permissive setting of the voltage and a very quick shutdown in the event of a short circuit from the driving AC network; For example, in the case of a high-frequency clocking, a shutdown that is rich in microseconds can be achieved. With this quick shutdown, a pre-choke to limit the mains current can also be omitted or greatly reduced.

Die Taktung und feinstufige Schaltung der Spannung macht es auch möglich, den Kurzschluß und den Filterüberstrom primärseitig zu erfassen, so daß gegebenenfalls auch auf die relativ aufwendige hochspannungsseitige Erfassung der Filterwerte verzichtet werden kann. The timing and fine-tuned switching of the voltage also makes it possible, the short circuit and the filter overcurrent on the primary side capture so that, if necessary, also on the relatively complex high-voltage detection of the filter values can be dispensed with can.  

Bei einem Elektrofilter geht häufig dem eigentlichen Über­ schlag eine Art Vorionisierung voraus. Durch die Aussteuerung mit Stromblöcken kann die Ausbildung eines derartigen Ionisie­ rungskanals häufig verhindert werden, so daß sich weniger Über­ schläge im Filter ergeben.In the case of an electrostatic precipitator, the actual transfer is often the issue suggest some kind of pre-ionization. By modulation with current blocks, the formation of such an ionization tion channel can be prevented so that there is less over results in the filter.

Claims (5)

1. Spannungsversorgung für ein Elektrofilter mit
  • a) einem an ein Wechselspannungsnetz angeschlossenen Primärkreis, in dem ein Wechselstromsteller mit schnell abschaltenden Transistoren oder GTO-Thyristoren in Reihe zur Primärwicklung eines Hochspannungstransformators an­ geordnet ist und
  • b) einem Sekundärkreis, in dem das Elektrofilter über einen Gleichrichter mit der Sekundärwicklung des Transformators verbunden ist,
1. Power supply for an electrostatic filter with
  • a) a primary circuit connected to an AC voltage network, in which an AC power controller with rapidly switching transistors or GTO thyristors is arranged in series with the primary winding of a high-voltage transformer and
  • b) a secondary circuit in which the electrostatic filter is connected to the secondary winding of the transformer via a rectifier,
dadurch gekennzeichnet, daß die Aus­ steuerung (β) des Wechselstromstellers (2) in jeder Halbwelle der Primärwechselspannung (U N ) so gewählt ist, daß sich die zur Primärwicklung (5) durchgeschalteten Spannungszeitflächen in et­ wa symmetrisch zum Maximum (U max ) jeder Spannungshalbwelle grup­ pieren. characterized in that the control ( β ) of the AC power controller ( 2 ) in each half-wave of the primary AC voltage ( U N ) is selected such that the voltage time areas switched through to the primary winding ( 5 ) are symmetrical to the maximum ( U max ) of each voltage half-wave in et wa group. 2. Spannungsversorgung nach Anspruch 1, dadurch ge­ kennzeichnet, daß die Zahl (k) der geschalteten Spannungszeitflächen in jeder Halbwelle größer 2, vorzugsweise größer 10 ist.2. Power supply according to claim 1, characterized in that the number ( k ) of the switched voltage time areas in each half-wave is greater than 2, preferably greater than 10. 3. Spannungsversorgung nach Anspruch 1, gekennzeich­ net durch eine Veränderbarkeit der geschalteten Span­ nungszeitflächen hinsichtlich Dauer und Häufigkeit.3. Power supply according to claim 1, characterized net by changing the switched span time slots in terms of duration and frequency. 4. Spannungsversorgung nach Anspruch 1, gekennzeich­ net durch eine den Wechselstromsteller (2) zugeordnete primärseitige Überstrom- bzw. Kurzschlußerfassung.4. Power supply according to claim 1, characterized by a the AC power controller ( 2 ) assigned primary-side overcurrent or short-circuit detection.
DE19883813314 1988-04-20 1988-04-20 Voltage supply for an electrostatic precipitator (filter) Withdrawn DE3813314A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19883813314 DE3813314A1 (en) 1988-04-20 1988-04-20 Voltage supply for an electrostatic precipitator (filter)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883813314 DE3813314A1 (en) 1988-04-20 1988-04-20 Voltage supply for an electrostatic precipitator (filter)

Publications (1)

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DE3813314A1 true DE3813314A1 (en) 1989-11-02

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DE19883813314 Withdrawn DE3813314A1 (en) 1988-04-20 1988-04-20 Voltage supply for an electrostatic precipitator (filter)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660498A1 (en) * 1990-04-02 1991-10-04 Alcatel Business Systems Direct-current power supply device for an electronic circuit
EP0552389A1 (en) * 1992-01-20 1993-07-28 Siemens Aktiengesellschaft Power supply method for an electro-filter
EP1466667A2 (en) * 2003-04-09 2004-10-13 Sharper Image Corporation Air transporter-conditioner with particulate detection
EP1766764A1 (en) * 2004-06-14 2007-03-28 Young-Chang Cho Method for switching low-power using ac and system for performing the same and power supply for using the system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660498A1 (en) * 1990-04-02 1991-10-04 Alcatel Business Systems Direct-current power supply device for an electronic circuit
EP0552389A1 (en) * 1992-01-20 1993-07-28 Siemens Aktiengesellschaft Power supply method for an electro-filter
EP1466667A2 (en) * 2003-04-09 2004-10-13 Sharper Image Corporation Air transporter-conditioner with particulate detection
EP1466667A3 (en) * 2003-04-09 2004-11-03 Sharper Image Corporation Air transporter-conditioner with particulate detection
EP1766764A1 (en) * 2004-06-14 2007-03-28 Young-Chang Cho Method for switching low-power using ac and system for performing the same and power supply for using the system
EP1766764A4 (en) * 2004-06-14 2010-11-03 Young-Chang Cho Method for switching low-power using ac and system for performing the same and power supply for using the system

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