Analytical Formulation and Minimization of Voltage THD in Staircase Modulated Multilevel Inverters With Variable DC Ratios

Design and Implementation of Asymmetrical Multilevel Inverter With Reduced Components and Low Voltage Stress

“…To provide even values of N, an extra half-step with a value of p0/2, appearing at 0th phase angle, which is 𝛼0 = 0. The total number of phase switching angles per quarter-wave M is given as M= (N-1)/2 excluding 𝛼0, is related to N [30].…”

Reduced Voltage Stress Asymmetrical Multilevel Inverter With Optimal Components

“…Thus the switch rated voltage for the recommended topology is determined using Table 2 and V SW ccv is considering from Table 5. Table 6 calculates and compares the costs of needed IGBTs and driver circuits for 1φ proposed 23-level MLIs and existing 13-level and 11-level MLIs [34], [33]. The MITSUBISHI Company produces a nominal current of 400A commercial IGBTs.…”

“…The generalized voltage of staircase modulation waveform can be represented as V(θ) = ∑ 𝑃 𝑘 𝑢(𝜃 − 𝛼 𝑘 ) + 𝑓 𝑡𝑔 𝑃 0 𝑀 𝑘=1 (33) where θ and 𝛼 𝑘 is lies in between 0 to 90 degrees, unit step function 𝑢(𝜃 − 𝛼 𝑘 ) is zero if 𝜃 < 𝛼 whereas its value is unity if 𝜃 ≥ 𝛼 and the toggle function 𝑓 𝑡𝑔 is zero for odd and 0.5 for even.…”