TWO TCR BRANCHES IN PARALLEL BASED CONTROLLABLE SERIES-COMPENSATED DEVICE AND CONTOL METHOD THEREOF

摘要

A two TCR branches in parallel based controllable series-compensated device and a control method thereof are provided. The controllable series-compensated device includes two TCR branches in parallel, causing a lower current in each TCR branch and thereby solving the problem of the shortage of flow capacity of existing thysitors in an extra-high-voltage controllable series-compensated device. The TCR branch is composed of two antiparallel thyristors in series with a reactor (L1, L2) and then two TCR branches are connected in parallel, which forms the controllable series-compensated device; or two TCR branches in parallel are in series with a common reactor (L3), which forms the controllable series-compensated device. The demands of flow equalization and impedance are satisfied by controlling the equal current amplitudes in two TCR branches of the series-compensated device and the impendence of fundamental wave. The controllable series-compensated device could be satisfying the need of impendence control, of a simple controlling unit, using linear control, easy to carry out in practice and of good control stability.