Photovoltaic power conversion system based on cascaded inverters with synchronized space-vector modulation

Abstract

Almost all versions of classical space-vector PWM are based on the asynchronous principle, which results in sub-harmonics (of the fundamental frequency) in the spectrum of the output voltage of converters, which are very undesirable in medium/high power applications [8][9]. In order to provide voltage synchronization in dual inverter-fed drives, a novel method of synchronized PWM has been applied for control of these systems with single dc voltage source [10], and for the systems with two dc sources: without power balancing between sources [11], and also with power balancing PWM algorithms in a linear control range [12].