Control of Grid-Connected Voltage Source Converters During Unsymmetrical Faults

In this chapter, a current control scheme for grid-connected voltage source converters during unsymmetrical faults is presented. The method that is being given is based on a modification of direct power control with space vector modulation (DPC-SVM), which makes it ideal for controlling the converter during asymmetrical failures. The presented results show that the control scheme can maintain the magnitude of the current within its rated value and keep the distortion in the current minimal; as well as minimize the oscillations in the power caused by the negative-sequence components of voltage and current.