A Multilevel SVPWM Algorithm for Linear Modulation and Over Modulation Operation

The multilevel space vector pulse width modulation (SVPWM) is widely used for a multilevel inverter. However, the implementation of the SVPWM for a multilevel inverter is complicated. The complexity is due to the difficulty in determining the location of the reference vector, the calculation of on-times, and the determination and selection of switching states. This paper proposes a general SVPWM algorithm for multilevel inverters based on standard two-level SVPWM. Since the proposed multilevel SVPWM method uses two-level modulation to calculate the on-times, the computation of on-times for an n-level inverter becomes easier. The proposed SVPWM algorithm can be applied in both linear and over-modulation region. A five-level HNPC inverter is used to explain the proposed method. The scheme can be easily extended to a multi-level inverter. Finally, experimental results verify the validity of the method in this paper. In this paper, the design and implementation details of wireless ad-hoc terminals are proposed to build a rapidly deployable, frequency-agile, heterogeneous wireless network. [PUBLICATION ABSTRACT]