Conversor ANPC (Active Neutral Point Clamped) de três níveis: simulações e resultados experimentais com modulação PWM.

Abstract

The three-level ANPC converter (Neutral Point Clamped Active) was proposed in 2001 as an alternative version of the converter three-level NPC (Neutral Point Clamped) created in the 80s [1]. The NPC provided a relatively simple solution for extending the ranges of voltage and power in conventional two levels, although contributing to an improvement in the quality of the output signal. Currently the NPC is widely used in applications of high/medium power such as driving machines, converters, renewable energy distribution systems among others. An important factor to be considered in the NPC, concerns about the unequal losses on the power devices. Thus we can consider that the stresses on the semiconductor NPC are unequal making some devices more heated than others. This factor ultimately limits the switching frequency and the output power converter. In order to overcome the unequal distribution of losses in converter was proposed ANPC topology, where the NPC clipping diodes were replaced by bidirectional switches. Thus, the additional switches in ANPC will enable more switching states and switching operations compared to NPC. This increase of switching states generates a greater degree of freedom in choosing the appropriate modulation strategy. In fact, the possibility of more than one switching state to attain O is what makes possible a more equitable distribution of losses on the power devices in the ANPC. For this purpose, it is necessary to study the modulation techniques applied in the converter ANPC to the most efficient solution becomes applicable. This course conclusion work proposes the acquisition and analysis of experimental results ANPC converter mounted in the Laboratory of Industrial Electronics and Drives Machines (LEIAM) belonging to the department of electrical engineering of UFCG. To obtain the experimental results, it is necessary to simulate and analyze the results of ANPC topology through PSIM software version 9.0.3, as well as the configuration of DSP TMS320F28335 eZdsp model to be used in the generation of switching states.