In a CHB based multilevel inverter how to find the RMS output voltage of each cell when modulated by Sinusoidal pulse width modulation?
Determine the modulation index, m, which is the ratio of the amplitude of the reference sine wave to the amplitude of the DC voltage of the inverter.
Calculate the amplitude of the output voltage of each H-bridge cell using the modulation index and the reference sine wave. For example, for the first cell, the output voltage can be calculated as:
V1 = mVdcsin(wt)
Where Vdc is the DC voltage of the inverter, wt is the angular frequency of the reference sine wave, and m is the modulation index. Calculate the RMS voltage of each H-bridge cell by taking the square root of the average value of the voltage squared over the one-half cycle of the reference sine wave. This can be expressed mathematically as:
Vrms = sqrt((1/T)(integral of V(t)^2dt))
where T is the period of the reference sine wave and the integral is taken over the one-half cycle of the sine wave. Repeat steps 2 and 3 for each H-bridge cell in the CHB multilevel inverter.
Thank you sir for your answer. But in a case of MLI Vref = m*((N-1)/2)*Vdcsin(wt) is the reference sine wave. The first cell does not obeys V1 = mVdcsin(wt).
N=number of levels. Vref=reference waveform of phase
- Badges
- Science topic
- Similar topics
- Methodology
- Research Methodology
- Research Papers