Studying the effect of over-modulation on the output voltage of three-phase single-stage grid-connected boost inverter

• Main Authors: A. Abbas Elserougi, A.S. Abdel-Khalik, A. Massoud, S. Ahmed
• Format: Article
• Language: English
• Published: Elsevier 2013-09-01
• Series: Alexandria Engineering Journal
• Subjects: Boost; Extended gain; Over-modulation; Third harmonic injection
• Online Access: http://www.sciencedirect.com/science/article/pii/S1110016813000525

Voltage boosting is very essential issue in renewable-energy fed applications. The classical two-stage power conversion process is typically used to interface the renewable energy sources to the grid. For better efficiency, single-stage inverters are recommended. In this paper, the performance of single-stage three-phase grid-connected boost inverter is investigated when its gain is extended by employing over-modulation technique. Using of over-modulation is compared with the employment of third order harmonic injection. The latter method can increase the inverter gain by 15% without distorting the inverter output voltage. The performance of extended gain grid-connected boost inverter is also tested during normal operation as well as in the presence of grid side disturbances. Simulation and experimental results are satisfactory.