4.1 INTRODUCTION4.2 SPACE-PHASOR REPRESENTATION OF A BALANCED THREE-PHASE FUNCTION4.3 SPACE-PHASOR REPRESENTATION OF THREE-PHASE SYSTEMS4.4 POWER IN THREE-WIRE THREE-PHASE SYSTEMS4.5 αβ-FRAME REPRESENTATION AND CONTROL OF THREE-PHASE SIGNALS AND SYSTEMS4.6 dq-FRAME REPRESENTATION AND CONTROL OF THREE-PHASE SYSTEMS