Abstract
This paper proposes a variable common mode injection pulse width modulation (VCMIPWM) scheme for three level neutral point clamped (NPC) inverter. Using suitable PWM control technique the waveform quality of the inverter output can be improved. Optimal harmonic profile may be obtained by having equal zero vectors in a switching cycle. If the expression of common mode injection as calculated for two level inverters is directly applied for three level inverters the dwell times for zero vectors will be unequal and the harmonic performance will be poor. The amount of common mode injection required to have equal zero vectors depends on the magnitude of sinusoidal reference vectors. The amount of common mode injection is calculated for various cases of reference sinusoidal vectors and is injected with the sinusoidal reference vectors to produce modified reference vectors. Simulation has been carried out in MATLAB/SIMULINK for three level inverter with the VCMIPWM and the results are compared with the fixed common mode injection pulse width modulation (FCMIPWM).
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Nageswari, S., Suresh Kumar, V. (2013). Common Mode Injection PWM Scheme with Equal Zero Vector Placement for Three Level NPC Inverter. In: Malathi, R., Krishnan, J. (eds) Recent Advancements in System Modelling Applications. Lecture Notes in Electrical Engineering, vol 188. Springer, India. https://doi.org/10.1007/978-81-322-1035-1_18
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DOI: https://doi.org/10.1007/978-81-322-1035-1_18
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