Multilevel inverter with 12-sided polygonal voltage space vector locations for induction motor drive

Multilevel dodecagonal space-vector generation for induction motor drives by cascading three-level and two-level inverters

“…This overhead is insignificant because for a TMS320F2812 DSP running at 150 MHz, and a sampling time of 1000 ms, the computation time is less than 10 ms. second trace, mains current (0.1 A/div); bottom trace, phase current of induction motor (1 A/div); x-axis,10 ms/div b Normalised harmonic spectrums of mains current: x-axis, harmonic order; y-axis, normalised harmonic magnitude It is well understood that feeding a motor through long cables with a voltage having high dv/dt causes insulation failures [20]. Since the circuit provides multilevel operation, there is a large reduction of dv/dt in the phase voltage when compared with the experimental results for the three cascaded two-level inverter configuration [11]. This improvement was obtained by using only the same number of switches.…”

“…Dodecagonal voltage space-vector switching [11] completely eliminates these harmonics. In order to exploit the advantages of dodecagonal switching, multilevel inverters proposed in [12], utilised hexagonal and dodecagonal structures for lower and higher modulation indices, respectively.…”

A 5th and 7th order harmonic suppression scheme using capacitive filtering for 2-level VSI fed IM drive

“…But this scheme has been validated only for square-wave mode of operation. Complete 5th and 7th order harmonics elimination was achieved using open-end winding IM, in [8], [10], [11]. But this topology requires extra power supply for eliminating these harmonics.…”

“…Extensive simulation study of the steady state and dynamic performance of the drive is carried out in Simulink on a 3.7 kW motor. elimination of 6n ± 1, n = odd order harmonics, for the entire modulation range including the extreme 12-step mode [8], [10], [11]. One such scheme is shown in Fig.…”

Multilevel Inverter with 18-sided Polygonal Voltage Space Vector for an Open-end Winding Induction Motor Drive

“…It has been shown in a 12-sided polygonal voltage space vector scheme [9], that there is complete elimination of the 6n±1, n=1, 3, 5…harmonics with significant suppression of 11 th and 13 th harmonics. More recently an inverter with 12-sided polygonal voltage space vectors has been realized by a multilevel inverter with asymmetrical DC-links feeding an induction motor from one side [10]. In this paper an inverter with 18-sided polygonal voltage space vector locations is proposed, for an induction motor with open-end windings.…”