Space vector based pulse density modulation scheme for multilevel inverter control with zero voltage switching

Anilett Benny, T Ruban Deva Prakash
2014 2014 Annual International Conference on Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD)  
Space Vector Based Pulse Density Modulated scheme for multilevel inverter is proposed in this paper. A two level and three level inverters with three different DC input voltages are used to produce 18 stepped output sinusoidal voltage. First order sigma delta modulator is used to obtain Pulse Density Modulation. The vector space is divided into 18 segments for spatial quantization. Sixty degree co-ordinate system is used to avoid fractional arithmetic. The proposed scheme uses only switching
more » ... tors which lie on the vertices of 18 sided polygon. The scheme uses only sector identification for selecting the switching vectors without using lookup table and timer. The proposed scheme with 18 sided polygonal multilevel inverter results in elimination of 5 th , 7 th , 11 th and 13 th order harmonics when compared to two level inverter schemes. Simulation results of the proposed scheme are compared with that of two level inverter schemes. From the results, the total harmonic distortion (THD) of the output voltage of SVPDM based 2-level inverter is 31.13% and the 18-sided multilevel inverter with SVPDM is 10.11%. From the results, the validity of the SVPDM based 18-sided multilevel inverter has been confirmed. Zero voltage switching can be incorporated in future for achieving high efficiency. structure gives an increased modulation range with the absence of 5 th , 7 th , 11 th and 13 th harmonics from the output voltage [7] . So this scheme can be considered as available alternative for low and medium voltage high power drive applications.
doi:10.1109/aicera.2014.6908191 fatcat:u7ljjjbygvdapc2fyukxb5q2k4