Device for creating a neutral point in an electrical system

Details Device for creating a neutral point in an electrical system Device for creating a neutral point in an electrical system

H - Electricity

02

M

H02M 7/02 (2006.01) H02J 3/26 (2006.01) H02M 7/217 (2006.01) H02M 7/66 (2006.01)

Patent

CA 2331648

An electric supply system comprising two or more phases (R2, S2, T2), one rectifier (101, 103, 105) for each phase, the second primary terminals of said rectifiers (101, 103, 105) being interconnected, also comprises an Artificial Neutral Point (ANP) creating means (A2) for creating an artificial neutral point (NA2) in the electric supply system, connected in parallel with said rectifiers. The ANP means (A2) short-circuits the zero sequence voltage component of the system but does not affect the positive and negative sequence components. The ANP means (A2) includes magnetic components of such a kind that the vector sum of the magnetic fluxes is zero. According to a first embodiment, the ANP means (A1) comprises one transformer (113, 115, 117) for each phase, the primary winding of each transformer connected to the respective phase (R2, S2, T2) in a star configuration, the secondary windings serially connected and the interconnection point of the primary windings forming an artificial neutral point.

L'invention concerne un système d'alimentation électrique comprenant au moins deux phases (R2, S2, T2), un redresseur (101, 103, 105) pour chaque phase, les secondes bornes primaires desdits redresseurs (101, 103, 105) étant interconnectées. Le système comprend également un dispositif (A2) de création d'un point neutre artificiel (ANP) permettant de créer un point neutre artificiel (NA2) dans le système d'alimentation électrique, lequel dispositif est monté en parallèle avec les redresseurs. Le dispositif ANP (A2) court-circuite la composant de tension homopolaire du système sans avoir d'incidence sur les composantes de séquence positive et négative. Le dispositif ANP (A2) comprend des composantes magnétiques d'un type tel que la somme vectorielle des flux magnétiques est égale à zéro. Selon un premier mode de réalisation, le dispositif ANP (A1) comprend un transformateur (113, 115, 117) pour chaque phase, l'enroulement primaire de chaque transformateur étant connecté aux phases respectives (R2, S2, T2) selon une configuration en étoile, les enroulements secondaires étant montés en série et le point d'interconnexion des enroulements primaires formant un point neutre artificiel.

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