Expansion method of current reconstruction area using voltage injection in synchronous coordinates system

동기좌표계 전압주입을 이용한 3션트 PWM 인버터의 전류 복원 영역 확장 기법

When controlling a three-phase inverter that drives AC motor, it is important to know the value of the current. In this case, shunt sensing methods are known as low cost and useful performance. However, for certain swithcing condition, immeasurable areas exist and it is necessary to reconstruct the current in the area. This paper proposes a reconstruction method using voltage injection in synchronous coordinates system at the area, and verify the validity of the method through simulation.