Critical Grid Power Quality Enhancement by Adaptive Hybrid Controllers Integrated PV Connected Multilevel Dual Converter Topology

In this paper, a dual converter topology is introduced to improve the power quality of the distribution system. A dual converter topology with a common link capacitor and Photo Voltaic (PV) array is connected to the low-voltage line to improve the power quality. The PV source injects active power into the line for the reduction of power consumption from conventional sources. One of the converters is connected in series, and the other is connected in parallel or shunt to the low-voltage line. The series-connected converter compensates for the voltage fluctuations and drops, whereas the shunt-connected converter mitigates the harmonics generated by the non-linear load. Both converters work in synchronization with the main source voltage by taking feedback from the source voltages. The shunt converter is operated with different control algorithms which improve the harmonic mitigation in the source side. Initially, a traditional Proportional Integral (PI) controller is introduced as a DC voltage regulator in the shunt controller. Later the PI controller is replaced with Proportional Resonant (PR) and Adaptive Fuzzy - PI (AF-PI) controller for better performance of the DC voltage regulator. With the new adaptive controllers, the damping and oscillations are reduced to a great extent reducing the harmonic content in the voltage and currents on the main source side. A comparative analysis is carried out with these mentioned controllers using MATLAB software, validating the results using tools from Simulink software. A comparison table will be provided comparing different parameters of the system and determining the best controller.