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WO2007035111A1 - Bobinage de stabilisation de multivibrateur en systemes tn et tt - Google Patents

Bobinage de stabilisation de multivibrateur en systemes tn et tt Download PDF

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Publication number
WO2007035111A1
WO2007035111A1 PCT/NO2006/000328 NO2006000328W WO2007035111A1 WO 2007035111 A1 WO2007035111 A1 WO 2007035111A1 NO 2006000328 W NO2006000328 W NO 2006000328W WO 2007035111 A1 WO2007035111 A1 WO 2007035111A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
mci
autotransformer
windings
controllable inductor
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.)
Ceased
Application number
PCT/NO2006/000328
Other languages
English (en)
Inventor
Christian M. Hartmann
Bjørnar S. JOHANSEN
Reidar Tjeldhorn
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.)
Magtech AS
Original Assignee
Magtech AS
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 Magtech AS filed Critical Magtech AS
Publication of WO2007035111A1 publication Critical patent/WO2007035111A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F29/146—Constructional details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/02—Auto-transformers

Definitions

  • the present invention relates to a method and a system for voltage symmetrisation and for increasing short circuit capacity.
  • the present invention relates to symmetrisation and increase of short circuit capacity in a device for voltage control and/or voltage stabilization for a three-phase power supply.
  • Undersized lines for electric power transmission also referred to as "weak lines" have too small conductor cross section in relation to the load requirements, moreover they have relatively high impedance. Excessive voltage drop will result from the losses caused by undersized conductors. The excessive voltage drop results in inadequate voltage levels for the electric power connected to the lines.
  • WO 2004/053615 describes a system for voltage stabilization of such power lines.
  • the TN- and TT-system comprises four current carrying lines - three phases and neutral.
  • a single phase load will draw current from one supply line only and return it through the neutral conductor. This causes voltage unbalance when a system with weak lines has an unsymmetrical load. When the load is far downstream, this disadvantage is even more noticeable.
  • upstream means any point closer to the distribution transformer and "downstream” means any point further away from it.
  • neutral point displacement Another problem related to weak grids in TN- and TT-networks called neutral point displacement.
  • the problem is that the impedance in the neutral conductor causes a substantial voltage difference between the neutral point at the distribution transformer and a neutral point far downstream when the system is non- symmetrically loaded. This increases the unbalance and also causes the system to be very unpredictable. For this reason, the voltage stabilizing system such as described in WO 2004/053615 will not be sufficient to stabilize the voltages at very nonsymmetrical loads in TN- and TT-networks. Therefore, an additional means to stabilize the phase voltages is necessary.
  • the European standard EN50160 "Voltage characteristics of electricity supplied by public distribution systems” sets, among other things, limits for permissible deviations from the nominal system voltages.
  • Another problem related to weak grids is that the one-poled short circuit capacity is low because of the high impedance in the grid. Hence, the currents that occur at faults are in some cases not sufficiently high to release the over-current protection within a satisfactory time-frame. This can result in high temperature in the fault- spot which in worst case causes fires.
  • the object of the present invention is to provide an improved method and system for voltage symmetrization in a three phase power supply system which overcomes the above-mentioned disadvantages. Consequently, one object of the invention is to increase the short circuit capacity at single-pole faults.
  • the present invention relates to a power supply system with voltage symmetrisation and increased short circuit capacity, comprising for each phase: an autotransformer (TA, TB, TC) with a parallel winding (4, 5, 6) and a series winding (7, 8, 9), where the series winding (7, 8, 9) is connected between the input voltage (Ua, Ub, Uc) and the output voltage (Ua_out, Ub_out, Uc_out), the autotransformer (TA, TB, TC) further comprising a tertiary winding (22, 23, 24) galvanically separated from the parallel (4, 5, 6) and series (7, 8, 9) winding of the autotransformer; - a magnetic controllable inductor (MCI A , MCI B , MCIC) comprising a first winding (13, 14, 15) wound around a core, and a second winding (16, 17, 18) wound around said core, and a control winding (10, 11, 12), which is adapted to create a
  • Fig. 1 shows a system according to the preferred embodiment of the invention
  • Fig. 2 shows the system in fig. 1, where various voltages and currents are shown
  • Fig. 3 shows a phasor diagram of the voltages in fig. 2
  • Fig. 4 shows the relationship between the voltage on the input and the stabilizing winding
  • Fig. 5 shows how the voltages over the stabilizing winding form a closed polygon.
  • Fig. 6 shows an alternative embodiment of the autotransformer in the system in fig. 1.
  • Fig. 7 shows the results when the short-circuit performance was tested.
  • the system according to the invention comprises, for each phase: an autotransformer TA, TB, TC with a parallel winding 4, 5, 6 with Np turns and a series winding 7, 8, 9 with Ns turns.
  • the series winding 7, 8, 9 is connected between the input voltage Ua 5 Ub, Uc and the output voltage U a>O ut, Ub, ou t, and U C;0Ut .
  • the autotransformer TA, TB 5 TC also comprises a tertiary winding 22, 23, 24 with NT turns. This tertiary winding is galvanically separated from the parallel 4, 5, 6 and series winding 7, 8, 9 of the autotransformer.
  • the system further comprises three magnetic controllable inductors MCI A , MCI B5 MCIc, one for each phase.
  • the magnetic controllable inductors comprise a first winding 13, 14, 15 with N M C I , P turns wound around a first core, and a second winding 16, 17, 18 with N M ci,s turns wound around the core, and a control winding 10, 11 5 12.
  • the control winding is adapted to create a magnetic field mainly orthogonal to the field created by the first winding and the second winding, thereby controlling the inductance of the magnetic controllable inductor MCI A , MCI B , MCIc.
  • the magnetic controllable inductor is described in the prior art.
  • the inductance of the magnetic controllable inductor MCI A5 MCI B , MCI C is controlled by providing a control current to the control winding.
  • the control current is controlled by a control circuit as e.g. described in the applicant's Norwegian patents NO 319367 and NO 318397.
  • the parallel winding 4, 5, 6 of the autotransformer T A , T B , T C is connected between the input voltage Ua, Ub, Uc and the first winding 13, 14, 15 of the magnetic controllable inductor MCI A , MCI B , MCI C -
  • the other terminal of the first winding 13, 14, 15 is connected to the neutral point.
  • the tertiary winding 22, 23, 24 of the autotransformer TA, TB, TC is connected to the second winding 16, 17, 18 of the magnetic controllable inductor MCI A , MCI B , MCIc through their respective first terminals. These pairs of windings are also mutually connected.
  • the second terminal of the tertiary winding 22 of the first autotransformer TA is connected to the second terminal of the second winding 18 of the third magnetic controllable inductor MCIc
  • the second terminal of the tertiary winding 23 of the second autotransformer TB is connected to the second terminal of the second winding 16 of the first magnetic controllable inductor MCI A
  • the second terminal of the tertiary winding 24 of the third autotransformer TC is connected to the second terminal of the second winding 17 of the second magnetic controllable inductor MCI B .
  • the delta connection 22, 16, 23, 17, 24, 18 establishes a stabilizing winding of the system according to the invention. The function of the stabilizing winding will be further explained below.
  • FIG 3 the phase diagram for the circuit in Figure 2 is shown.
  • the phasors are related to the voltages in Figure 2. It is seen that the voltage over the series windings, U A ,OUT-UA, UB,OUT-UB, UC,OUT-UC is added to the input voltages UA 5 U B and Uc such that the output voltages UA,OU T> UB, O U T and U C . OUT are larger in magnitude compared to the input voltages.
  • the magnitude of the voltage over the series windings, U A ,OUT-U A , U B , O U T -U B , U C, O UT -UC is determined by the voltage division between the voltages over the autotransformers' parallel winding U A -U 1 , U B -U 2 , U C -U 3 and the voltages U 1 , U 2 , U 3 over the controllable inductances' first winding.
  • the transformed voltages are a mapping of the primary voltages, they differ in the way the three phases are interconnected.
  • Figure 5 shows that the transformed voltages form a closed polygon of phasors because of the delta connection of the stabilizing winding.
  • the network as-is i.e. with no voltage stabilizing unit connected. This case is referred to as "lines only" in the table.
  • a bypass circuit 1 is preferably included, as shown in fig. 6.
  • the switch 100 in the bypass circuit is controlled by the control circuit. At a predefined voltage level, the bypass circuit is activated to ensure maximum fault current.
  • Figures 7a - d show test results of the performance at single pole short circuit for four cases.
  • the parameters of interest are:
  • test results show a clear improvement in the system's behavior when the device according to the invention is used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

La présente invention concerne un système d'alimentation électrique à stabilisation de tension comprenant, pour chaque phase, un autotransformateur (TA, TB, TC) avec un bobinage parallèle (4, 5, 6), un bobinage série (7, 8, 9), et un bobinage tertiaire (22, 23, 24) qui est séparé de manière galvanique du bobinage parallèle (4, 5, 6) et du bobinage série (7, 8, 9) de l'autotransformateur, et un inducteur à commande magnétique (MCIA, MCIB, MCIC), le bobinage parallèle (4, 5, 6) de l'autotransformateur (TA, TB, TC) étant raccordé en série à un premier bobinage (13, 14, 15) de cet inducteur (MCIA, MCIB, MCIC) entre la tension d'entrée (Ua, Ub, Uc) et le point neutre, et le bobinage tertiaire (22, 23, 24) de l'autotransformateur (TA, TB, TC) étant raccordé à un second bobinage (16, 17, 18) de l'inducteur (MCIA, MCIB, MCIC) via leurs premières bornes respectives pour former des paires de bobinages, ces paires de bobinages étant interconnectées.
PCT/NO2006/000328 2005-09-23 2006-09-22 Bobinage de stabilisation de multivibrateur en systemes tn et tt Ceased WO2007035111A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20054428 2005-09-23
NO20054428A NO324259B1 (no) 2005-09-23 2005-09-23 Stabiliseringsvikling for MVB i TN- og TT-nett

Publications (1)

Publication Number Publication Date
WO2007035111A1 true WO2007035111A1 (fr) 2007-03-29

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ID=35355998

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2006/000328 Ceased WO2007035111A1 (fr) 2005-09-23 2006-09-22 Bobinage de stabilisation de multivibrateur en systemes tn et tt

Country Status (2)

Country Link
NO (1) NO324259B1 (fr)
WO (1) WO2007035111A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009123469A1 (fr) * 2008-03-31 2009-10-08 Magtech As Topologie de dévoltage-survoltage
EP3392996A1 (fr) * 2017-04-21 2018-10-24 ABB Schweiz AG Régulation de tension longitudinale aux bornes d'une ligne d'un transformateur déphaseur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH516242A (de) * 1969-03-03 1971-11-30 Bbc Brown Boveri & Cie Spannungsüberwachungseinrichtung an einem eine Last speisenden mehrphasigen Spannungswandler
EP0684679A1 (fr) * 1994-05-26 1995-11-29 Abb Stromberg Kojeet Oy Méthode pour la réduction de la distorsion de la forme de l'onde en un dispositif électrique et circuit pour un dispositif électrique
WO2004053615A1 (fr) * 2002-12-12 2004-06-24 Magtech As Systeme pour la stabilisation de tension de lignes d'alimentation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH516242A (de) * 1969-03-03 1971-11-30 Bbc Brown Boveri & Cie Spannungsüberwachungseinrichtung an einem eine Last speisenden mehrphasigen Spannungswandler
EP0684679A1 (fr) * 1994-05-26 1995-11-29 Abb Stromberg Kojeet Oy Méthode pour la réduction de la distorsion de la forme de l'onde en un dispositif électrique et circuit pour un dispositif électrique
WO2004053615A1 (fr) * 2002-12-12 2004-06-24 Magtech As Systeme pour la stabilisation de tension de lignes d'alimentation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009123469A1 (fr) * 2008-03-31 2009-10-08 Magtech As Topologie de dévoltage-survoltage
EP3392996A1 (fr) * 2017-04-21 2018-10-24 ABB Schweiz AG Régulation de tension longitudinale aux bornes d'une ligne d'un transformateur déphaseur
WO2018192845A1 (fr) * 2017-04-21 2018-10-25 Abb Schweiz Ag Régulation de tension longitudinale aux bornes de ligne d'un déphaseur
US10742028B2 (en) 2017-04-21 2020-08-11 Abb Power Grids Switzerland Ag Longitudinal voltage regulation at the line terminals of a phase shifting transformer

Also Published As

Publication number Publication date
NO324259B1 (no) 2007-09-17
NO20054428L (no) 2007-03-26
NO20054428D0 (no) 2005-09-23

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