Abstract—Compared with conventional table-based direct
power control (DPC), DPC using space vector modulation (DPCSVM)
exhibits several specific features, such as a constant switching
frequency and small ripples in both active power and reactive
power. However, conventional DPC-SVM exhibits highly distorted
grid currents when the grid voltages are unbalanced. In this study,
we propose a novel and simple DPC-SVM that is effective under
both ideal and unbalanced grid voltage conditions by using
an extension of original instantaneous power theory.