Mita-Teknik A/s

Carsten Henriksen

The invention relates to a procedure of connecting a polyphased asynchronous generator on a polyphased alternating voltage network. The connecting is carried out by means of an adjustable, electronic connecting based on thyristors or similar variable (adjustable) connecting items, the connecting degree of which is varied during a controlled connecting course, which is controlled in consideration of the wish of a &ldquo;soft&rdquo; connecting on the network and a limitation of the maximum amperage during the connecting course. During the whole connecting course a continuous determination of the generator phase angle &phgr; is carried out, and on basis of this determination a continuous adjustment of thyristors&mdash;the aperture angle is carried out, thus the aimed, successive load connection of the generator on the network (soft-connecting) is obtained. Furthermore the procedure include a new method to determine the generator phase angle &phgr; by registering the time of zero circulation on the phase voltage, and at the same time detection of the respective thyristor voltage zero circulation point at a measuring method based on measuring of the thyristor voltage. The novelty of the invention consists in adjusting the ignition point of the thyristors successively to the phase angle &phgr;, thus the connecting degree resulted to the thyristors is increased in a controlled speed regardless of the variations registered in the phase angle during the connecting course, i.e. in the principle the thyristor aperture angle is reduced, when &phgr; increases and so on.

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Viborg, Denmark

Carsten Henriksen