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Bac Xuan Nguyen,D. Mahinda Vilathgamuwa,Gilbert Foo,Peng Wang,Andrew Ong 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
LCL network is one of the best choices for compensating bidirectional inductive power transfer (BIPT) systems. However, H ? Bridge power converter of the conventional BIPT systems generates highly distorted AC current which results in reduced overall system efficiency particularly in high power BIPT systems. In order to overcome this drawback, a multilevel converter (MC) with selective harmonic distortion (SHE) modulation method is presented in this paper to eliminate high order harmonic components in converter voltages at both sides of BIPT systems. The proposed MC topology is constructed using a modified H ? Bridge converter with minimum number of power switches. The proposed topology is suitable for low to medium power applications. The simulation results demonstrate the feasibility of the proposed scheme.
A Comparison between Quasi-Z-Source Inverter and Active Quasi-Z-Source Inverter
Truong-Duy Duong,Minh-Khai Nguyen,Young-Cheol Lim,Joon-Ho Choi,D. Mahinda Vilathgamuwa 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents some comparative results between the three-phase quasi-Z source inverter (qZSI) and active quasi-Z source inverter (AqZSI). An improved PWM method is proposed for AqZSI. The voltage gain can be increased by using the shoot-through duty cycle and the switching ratio of the additional switch. Compared to qZSI, AqZSI with improved PWM strategy has a higher efficiency at the boost mode. Furthermore, AqZSI can be operated up to a higher modulation index and it boasts a lower inductor current ripple and reduced shoot-through current. The analysis of inverter and the improved PWM strategy are discussed. An experimental prototype with output power of 600 W is built to show the agreement of theory and measurement.