A modified selective harmonic elimination method for fault-tolerant operation of multilevel cascaded H-bridge inverters

Unbalanced Selective Harmonic Elimination for fault-tolerant operation of three phase multilevel Cascaded H-bridge inverters

“…The multilevel CHBs are commonly used in industrial applications because of their inherent properties such as modular structure, simple physical layout and offering more redundant switching states than other topologies [2], [19]. Fig.…”

“…The conventional SHE only manipulates the harmonic amplitudes, however, in the proposed method the phase shift angle of harmonics are manipulated as well to modify the inverter operation and generate balanced line-to-line voltages. The phase shift angles that result to a balanced line-to-line voltage can be found by solving the following set of equations for α, β and γ [19]. …”

“…By changing the modulation technique on a faulty CHB, it is possible to produce balanced voltages after the fault occurrence. Several fault-tolerant methods have been introduced in [18] and [19]. In these methods the modulation strategy has been revised after the fault occurrence to continue balanced operation of multilevel inverter under faulty condition.…”

“…The maximum achievable voltage is increased after fault occurrence as compared to current techniques that bypass two operative power cells in each healthy phases in place of a fault [18,19]. Moreover the third order harmonics of line-to-line voltages are eliminated to maintain the standard THD requirements [20].…”

Three-dimensional finite-element-model investigation of axial-flux PM BLDC machines with similar pole and slot combination for electric vehicles

“…Nowadays, special attention has been paid to the field of power electronics and electric machines [1][2][3][4][5][6][7][8][9][10] as the concept of hybrid/electric vehicles, direct-driven wind turbines, and more electric aircraft/ships are extending.…”