ANALYSIS OF ALTERNATOR WITH TWIN 3L PHASE DISPLACED STATOR WINDINGS

Abstract

To : improve efficiency and alleviate certain limitations in large generators; two separate . stator : windings have been suggested The behaviour of an - alternator with two 3-phase stator widmgs -:displaced by an },angle o, was . analyzed by :means of an orthogonal :. . transformation of the a-b-c; . A-B-C, ' and field variables- - into new . set dl, q1, ol, d, g2,o2; and field The . present, work- deals with ~development of suitable circuit model for twin displaced stator wuadings of an alternator. The displacement . angle between windings . is variable in the =present analysis, The procedure envisages :representation of - the - ;machine using "Kron's Primitive' Machine" approach: On the basis this -primitive- machine model, the _general voltage equation leading to the phasor diagram have been derived and the expressions for active - and. reactive power have been :presented: 'A. phasor diagram;: has, been ' drawn in terms of '_self and mutual reactances . Xai, ,Xa2, Xq1 .Xq2,: Xma, .and `-Xmq between two set of windings -, The , power' angle'' curves - have, been drawn for different displacement : angle between two 'sets of : windings The steady - state analysis. has been performed and power vs_ torque angle: characteristics have been drawn: