POWER QUALITY IMPROVEMENT USING SHUNT ACTIVE POWER FILTER WITH dq0 THEORY

---This paper presents a comprehensive analysis and mitigation of harmonics in a grid-connected solar photovoltaic (PV) system with a voltage source inverter (VSI) and a current source inverter (CSI) at the load side. The load consists of a three-phase rectifier, a three-phase induction motor, and a three-phase unbalanced load. The system's harmonic distortion is mitigated using the DQ (Direct-Quadrature) methodology. The proposed approach effectively transforms the time-domain signals into the DQ domain, enabling the identification and compensation of harmonics. Simulation results demonstrate the efficacy of the proposed method in reducing total harmonic distortion (THD) and improving the overall power quality of the system. The findings of this research contribute to the development of more efficient and reliable grid-connected PV systems. Keywords--- Solar PV system, Voltage Source Inverter, Current Source Inverter, DQ methodology, Harmonic mitigation, Power quality.