Abstract
This paper provides a comprehensive analysis of the capacitors voltage switching ripple for three-phase three-level neutral point clamped (NPC) inverter topologies. The voltage ripple amplitudes of the two dc-link capacitors are theoretically estimated as a function of both amplitude and phase angle of output current and the inverter modulation index. In particular, peak-to-peak distribution and maximum amplitudes of the capacitor voltage switching ripple over the fundamental period are obtained. A comparison is made considering different carrier-based pulse-width modulations in the case of almost all sinusoidal load currents, representing either grid connection or passive load with a negligible current ripple. Based on the voltage switching ripple requirements of capacitors, a simple and effective original equation for a preliminary sizing of the capacitors has been proposed. Numerical simulations and experimental tests have been carried out in order to verify the analytical developments.
Highlights
In industrial applications, the most used switching inverter is the two-level converter
As the number of semiconductor devices is low, they can be controlled by different types of pulse-width modulation (PWM) techniques
It consists of a DC voltage source s) industrial applications, considering both the conventional and the
Summary
The most used switching inverter is the two-level converter. Most currently used multilevel topologies can be grouped: cascaded H-bridge (CHB), neutral point clamped (NPC), and flying capacitors (FC). The NPC inverter uses a single DC bus subdivided into a number of voltage levels by a series string of capacitors. Evaluation of the low-frequency the three-level NPC inverter using space vector modulation (SVM) techniques has been analyzed in [16]. It consists of a DC voltage source s) industrial applications, considering both the conventional and the. The that modulation the T-type inverter is able generally more efficient kept at oneishalf of DC-link voltage byresult usingshows a proper strategy to achieve voltage at lower switching balancing between frequencies
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