PROJECT TITLE :

Enhanced Instantaneous Power Theory for Control of Grid Connected Voltage Sourced Converters under Unbalanced Conditions - 2017

ABSTRACT:

Undesirable power oscillations occur in grid-connected voltage sourced converters (VSC) during unbalanced conditions. This drawback becomes a lot of difficult and pronounced throughout transients that embrace zero sequence content flowing through the ac/dc interface. This paper introduces a methodology especially designed to manage the instantaneous power in voltage sourced converters operating under unbalanced transient situations with positive, negative, and zero sequence content. The control relies on an adaptive transformation that instantaneously adjusts itself to the dynamic voltage conditions. The technique allows control over constant and oscillating terms of the instantaneous three-section power. It is applied to grounded 3-wire and 4-wire schemes, particularly accommodating zero sequence not like previous approaches. The technique expands the application of the p-q theory, which is hooked up to the aß0 transformation. The effectiveness of the proposed management approach and also the proposed power conditioning scheme was demonstrated using electromagnetic transient simulation of a VSC connected to an ac system.