입력 직류 전압과 Z-네트워크 커패시터 전압 검출에 의한 Z-소스 인버터의 출력 전압 제어

Abstract

Abstract - This paper proposes the algorithm for the output AC voltage control of Z-source inverter by the detection of the input DC voltage and Z-network capacitor voltage. The actual modulation index of the proposed method is detected by the capacitor voltage in Z-network and input DC voltage of three-phase Z-source inverter. Control modulation index for the output voltage control is calculated by the detected actual modulation index and reference modulation index. And, calculated control modulation index is applied to the modified space vector modulation (SVM) for control the output voltage of Z-source inverter. To verify the validity of the proposed method, PSIM simulation was achieved and a DSP controlled 1[kW] three-phase Z-source inverter was producted. The simulation and experiment were performed under the condition that the load was changed in case of the constant input DC voltage and the input DC voltage was changed in case of the load was constant. As a result, we could know that the output phase voltage of Z-source inverter followed to the reference voltage 70[VRMS] despite the load or the input DC voltage were suddenly changed.Key Words : Z-source inverter, Output voltage control, Detection of the input DC voltage and Z-network capacitor voltage, Modulation index, Modified space vector modulation(SVM)*정 회 원 : 전남대학교 전기공학과 박사과정** 정 회 원 : 전남대학교 전기공학과 교수***정 회 원 : 전남대학교 전기공학과 부교수† 교신저자, 정회원 : 대불대학교 융합기술학부 부교수E-mail : jyg@mail.daebul.ac.kr 접수일자 : 2011년 4월 18일 최종완료 : 2011년 7월 19일