Method and device for improving the current quality of an...

H - Electricity – 02 – J

Patent

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H02J 3/00 (2006.01) H02J 3/18 (2006.01)

Patent

CA 2300306

The invention relates to a method and device for improving the current quality of a superimposed network (14) by means of a compensation device (2) which is connected parallel to the network (14) and to a load (12) and provided with a pulse current converter (4). The control and regulating system (10) of the converter determines a transmittance space vector (ü) on the basis of a supply voltage and line current space vector (uN,iN) together with the actual value of a direct current voltage(Vdc). According to the invention, a compensated voltage fundamental space vector (uk,1) comprising a space vector for a compensated voltage fundamental positive phase sequence system and a space vector for a compensated voltage fundamental negative phase sequence system is generated. This enables the compensation device (2) to balance a high dynamic load and to compensate reactive power in relation to the fundamental frequency currents of a particular load (12), so that said load (12) when seen from the point of view of the superimposed network in relation to the fundamental mode can appear as a three-phase, symmetrical, ohmic resistance.

L'invention concerne un procédé et un dispositif pour améliorer la qualité du courant d'un réseau superposé (14) au moyen d'une unité de compensation (2) raccordée parallèlement au réseau (14) et à une charge (12), ladite unité comportant un convertisseur de courant pulsé (4). L'unité de commande et de régulation (10) dudit convertisseur détermine un pointeur d'espace de rapport de transmission (ü) en fonction d'un pointeur d'espace d'intensité et de tension réseau (u¿N?, i¿N?) et d'une valeur réelle de tension continue (V¿dc?). Selon l'invention, un pointeur d'espace de fondamentale de tension de compensateur (u¿k,1?) est généré, ledit pointeur étant constitué d'un pointeur de système de fondamentale de tension de compensateur (u¿k,1?) et d'un pointeur de contre-système de fondamentale de tension de compensateur (u¿k,1-?). Cette unité de compensation peut ainsi symétriser, avec une dynamique élevée, la charge et la compensation de charge réactive, en ce qui concerne les courants de fondamentale d'une charge quelconque (12), de sorte que cette charge (12) du point de vue du réseau superposé (14) apparaît, sur le plan de la fondamentale, comme une résistance ohmique symétrique triphasée.

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