Series-compensated converter station

H - Electricity – 02 – J

Patent

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Details

H02J 3/36 (2006.01) H02M 7/757 (2006.01)

Patent

CA 2200226

A series-compensated converter station in an installation for transmission of high-voltage direct current is connected to an alternating-voltage network (N) with three phases (A, B, C, respectively). The converter station comprises at least two direct-voltage series-connected six-pulse converter bridges (SR1, SR2, respectively), a three-phase transformer coupling with two secondary windings (SW1, SW2, respectively), and a star-connected primary winding (PW) with a neutral point (NP) connected to ground as well as a series capacitor unit (CN) for each one of the three phases. Each one of the converter bridges is connected to a respective secondary winding and the primary winding is connected to the alternating-voltage network via the series-capacitor units. The transformer coupling exhibits a high impedance to zero-sequence currents through the primary winding of the transformer coupling.

Un convertisseur compensé en série dans une installation de transmission de courant continu à haute tension est connecté à un réseau de tension alternative (N) à trois phases (A, B, C, respectivement). Le convertisseur comprend au moins deux ponts de convertisseur (SR1, SR2, respectivement) de courant continu à six impulsions connectés en série, un transformateur triphasé couplé à deux enroulements secondaires (SW1, SW2, respectivement), ainsi qu'un enroulement primaire (PW) connecté en étoile présentant un point neutre (NP) connecté à la terre ainsi qu'une unité condensateur en série (CN) pour chacune des trois phases. Chacun des ponts du convertisseur est connecté à un enroulement secondaire respectif et l'enroulement primaire est connecté au réseau de tension alternative par les unités condensateur en série. Le couplage en transformateur présente une haute impédance à des courants homopolaires dans l'enroulement primaire dudit couplage en transformateur.

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