Network topology

Electronic engineering

Engineering

Sawtooth wave

Artificial intelligence

Telecommunications

Pulse-width modulation

Physics

Waveform

Topology (electrical circuits)

MATLAB

Inverter

Harmonic

Acoustics

Operating system

Voltage

Harmonics

Computer science

Modulation (music)

Three-phase

Control (management)

Electrical engineering

Control theory (sociology)

CPSS Transactions on Power Electronics and Applications

An evaluation of level shifted and phase shifted triangular and sawtooth carrier modulation schemes for a seven level packed U cell (PUC) inverter is presented in this paper. The investigated PUC is the recently introduced topology for multilevel inverter having reduced switch count in comparison to the conventional topologies of multilevel inverters. The PUC inverter has six switches for 7 level inverter which is very less in comparison to the conventional topologies. In this paper, the level-shifted pulse width modulation (LS-PWM) and phase-shifted PWM (PS-PWM) for triangular and sawtooth carrier are presented and compared. A comparative harmonic analysis for all the cases is performed and results are presented in the paper. The difference in harmonics of the two modulation methods given by the theoretical approach for both the carrier is validated by the experimental results. DC voltage controller and load current controller of the PUC inverter are also designed and presented. The investigated PUC topology is tested in dynamic and steady state conditions and results obtained are presented. The analysis is done and validated using simulation in MATLAB Simulink environment and experimental approaches using FPGA platform.

Evaluation of Level-Shifted and Phase-Shifted PWM Schemes for Seven Level Single-Phase Packed U Cell Inverter