Method and apparatus for static and dynamic support of a...

H - Electricity – 02 – J

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H02J 3/18 (2006.01)

Patent

CA 2220511

Method and apparatus for static and dynamic support of a grid system voltage by means of a static power factor correction device having a self-commutated converter. The invention relates to a method for static and dynamic support of a grid system voltage (v) at a network node (PCC) by means of a static power factor correction device (2) which has a transformer and a self-commutated converter (12) with at least one capacitive energy store (14), and an apparatus (8) for carrying out the method. According to the invention, instantaneous reference values (q ref, i svref) for a secondary instantaneous control method are determined continuously as a function of determined voltage magnitude errors of the grid system voltage (v) at the network node (PCC), by means of which secondary instantaneous control method a phase angle (.delta.) is determined as a function of determined instantaneous actual values (q, i sv), by means of which phase angle (.delta.) the angle (.sigma.) of the converter voltage space vector ((v s) of the self-commutated converter (12) is produced as a function of the angle .PHI. of the grid system voltage space vector (v). This results in dynamic regulation of the reactive volt-amperes required for grid system voltage regulation.

L'invention concerne un procédé de soutien statique et dynamique d'une tension de réseau (<u>v</u>) sur un noeud de réseau (PCC) à l'aide d'un dispositif de compensation (2) statique qui comporte un convertisseur (12) autocommuté pourvu d'au moins une mémoire (14) capacitive et d'un transformateur. L'invention concerne par ailleurs un dispositif permettant de mettre ledit procédé en oeuvre. Selon l'invention, des valeurs théoriques instantanées (qref, isvref) sont déterminées en continu au niveau du noeud de réseau (PCC), sur la base des écarts de la tension de réseau (v) détectés, pour un procédé de régulation instantané en cascade, grâce auquel un angle de phase ( delta ) peut être déterminé sur la base des valeurs réelles instantanées (q, isv) obtenues. L'angle de phase ( delta ) permet de produire la position angulaire ( sigma ) de l'indicateur spatial de tension (<u>v</u>S) du convertisseur (12) autocommuté sur la base de la position angulaire ( phi ) de l'indicateur spatial de tension de réseau (<u>v</u>). Ce procédé permet d'obtenir une régulation dynamique de la charge réactive requise pour réguler la tension de réseau.

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