Detailed implementation of a current controller with 3D space vectors for four wire active filters

This research presents the detailed implementation of a current controller with three-dimension (3D) space vector pulse width modulation (SVPWM) for active filters used in four-wire unbalanced power systems. Many techniques of current control are widely known for three-wire balanced systems. However some modifications must be done in the original techniques when the system is unbalanced and has a neutral conductor. Few works are explicit and detailed on this subject. This paper shows the complete process of implementation of a four-wire current controller with a three-leg inverter and makes a comparison of its performance with the performance of the conventional hysteresis-based current controller.