High-efficiency voltage source converter with low switching power losses for application in islanded microgrids

作者：Hasari Seyyed Abbas Saremi; Salemnia Ahmad^*; Hamzeh Mohsen

来源：IET Renewable Power Generation, 2017, 11(10): 1295-1304.

DOI：10.1049/iet-rpg.2016.0226

• distributed power generation
• power distribution faults
• voltage-source convertors
• invertors
• power transistors
• frequency response
• islanded microgrids
• high-efficiency voltage source converter
• low switching power losses
• single-phase voltage-source inverter
• islanded AC grids
• single-phase series inverters
• power transistors
• transistor power losses
• root-locus analysis
• frequency-response analysis
• Matlab-Simulink software environment

In the conventional inverter, the switching power losses cause the inverter efficiency to decrease at high switching frequencies. In this study, a new structure of a single-phase voltage-source inverter with low switching losses is proposed, for application in islanded AC grids. This converter is composed of two single-phase series inverters, with different switching frequencies. The main feature of the proposed converter is that, the total losses of the proposed converter are fewer than the total losses of a conventional single-phase inverter, at high switching frequencies. The proposed converter is designed by the appropriate power transistors in the market. By providing a suitable method for calculating the transistor power losses, the switching and conduction losses of the proposed converter are calculated, and compared with losses of a conventional single-phase inverter. The mathematical model of the proposed converter is derived and used along with root-locus and frequency-response analysis, for designing the controllers. The performance of the proposed converter has been assessed using the simulation studies in MATLAB/SIMULINK software environment.

• 出版日期2017-8-16