Avergage Modeling and DC-Link Capacitor Voltage Regulation of SRF-dq Controlled Single-Phase ANPCI for Solar and Wind Power Applications

Abstract

A Voltage Source Inverter (VSI) converts DC voltage to ac voltage with adjustable magnitude and frequency. VSIs have numerous industrial applications, such as, uninterrupted power supplies, adjustable speed drives, High Voltage DC (HVDC) transmission, Flexible AC Transmission Systems (FACTS), renewable power generation, etc. Based on the number of output voltage levels, the VSIs can be classified as two-level inverters and Multi-Level Inverters (MLIs). Due to the high voltage and large power handling capability and reduced Total Harmonic Distortion (THD) in the output voltage, MLIs are preferred to two-level inverters, mostly in the medium and high-power applications. Neutral Point Clamped (NPC) MLI, Flying Capacitor (FC) MLI and cascaded H-bridge MLI are the most popular topologies among the various MLIs available in the literature.