Specialized Schemes of Space-Vector Modulation of VSI for Synchronous Voltage Control of PV Stations

This paper briefly reviews the development and widespread use of an alternative method of synchronous pulse-width modulation (PWM), based on a space vector approach, for the control of voltage source inverters (VSIs) and inverter-based photovoltaic grid-tied (PV) installations with low switching frequency of inverters. It assures providing synchronization and symmetry of winding voltage of power transformer for any operation conditions including cases of fluctuation of grid frequency, of unequal voltages of dc-sources (PV panels), etc. Examples of the use of this PWM method to control several topologies of VSI-based photovoltaic stations with multi-winding power transformer are presented.