Abstract
Aiming at analysis complexity, a simulation model is built and presented to analyze and demonstrate the characteristics of the direct current (DC) link current of the three-phase two-level inverter with the random space vector pulse width modulation (SVPWM) strategy. The developing procedure and key subsystems of the simulation model are given in detail. Several experiments are done using the simulation model. The results verify the efficiency and convenience of the simulation model and show that the random SVPWM scheme, especially the random switching frequency scheme, can efficiently suppress the harmonic peaks of the DC link current.
Highlights
The voltage source inverter (VSI) has been widely in adjustable frequency drives (AFDs) in all kinds of fields [1]
The random space vector pulse width modulation (SVPWM) subsystem is the key to the simulation and is built using Embedded MATLAB Function block
A simulation model for the direct current (DC) link current analysis has been built in MATLAB and presented in this paper
Summary
The voltage source inverter (VSI) has been widely in adjustable frequency drives (AFDs) in all kinds of fields [1]. The inverter uses semiconductor switches to make the load terminal connect to the positive or negative rail of the DC link. The three-phase two-level inverter shown in Figure 1 is mainly composed of 6 switches. The above study is focused on the deterministic SVPWM strategy. The volt-second balance principle that the SVPWM strategy adopts results in plenty of harmonics in the output waveforms of the inverter besides the required fundamental or first harmonic. The phenomenon is most serious in the deterministic SVPWM strategy because the harmonics around the multiples of the switching frequency have large magnitudes. The DC link current presents tremendous difference in the random SVPWM strategy. A simulation model is built and the characteristic of the DC link current with the random SVPWM strategy is discussed based on the simulation results in the paper
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