전력 디커플링 기능을 가진 단상 계통연계 전압형 인버터

• Published in: 전기학회 논문지 P권, 66(4) Vol. 66P; no. 4; pp. 236 - 241
• Main Authors: 이상욱(Sang-Wook Lee), 문상필(Sang-Pil Mun), 박한석(Han-Seok Park)
• Format: Journal Article
• Language: Korean
• Published: 대한전기학회 2017
• Subjects: 전기공학; Grid connected voltage-ed inverter; Push-pull converter; Photovoltaic power generation system; Active power decoupling; High efficiency
• ISSN: 1229-800X; 2586-7792

This paper presents a single-phase grid connected voltage-ed inverter with a power decoupling circuit. In the single-phase grid connected voltage-ed inverter, it is well known that a power pulsation with twice the grid frequency is contained in the input power. In a conventional voltage type inverter, electrolytic capacitors with large capacitance have been used in order to smooth the DC voltage. However, lifetime of those capacitors is shortened by the power pulsation with twice grid frequency. The authors have been studied a active power decoupling(APD) method that reduce the pulsating power on the input DC bus line, this enables to transfer the ripple energy appeared on the input DC capacitors into the energy in a small film capacitor on the additional circuit. Hence, extension of the lifetime of the inverter can be expected because the small film capacitor substitutes for the large electrolytic capacitors. Finally, simulation and experimental results are discussed.