Analysing UPQC performance with dual NPC converters: Three-dimensional and two-dimensional space vector modulation

• The capacitor voltage unbalance is minimized to 0.67%. • THD is reduced to 0.22% and 1.79% for output voltage and current with balanced load, and 7.88% and 6.24 % for output voltage and current with unbalanced load. • Neutral current of the system is minimized to 0.25A. A Unified Power Quality Conditioner (UPQC) is designed with series and shunt type Neutral Point Clamped (NPC) converters and it is controlled by 2-Dimensional Space Vector Modulation (2D-SVM) and 3-Dimensional Space Vector Modulation (3D-SVM). Three phase three leg series NPC converter acting as a three-phase rectifier, which is controlled by 2D-SVM method and three phase four leg shunt NPC converter acting as a three phase four leg three level inverter, which is controlled by 3D-SVM. With series and shunt active filters for balanced and unbalanced load circumstances, the proposed method functions as a UPQC network. This arrangement helps to minimize capacitor voltage unbalance, eliminate neutral current problems, reduce electromagnetic interference, and reduce total harmonic distortion for balanced and unbalanced load circumstances. The suggested system, which is managed utilizing 2D-SVM and 3D-SVM, improves performance while reducing power quality issues compared to the traditional UPQC system. Using Matlab Simulink and an FPGA processor, the findings of the simulation and the hardware are independently verified and compared.