화학공학소재연구정보센터
IEEE Transactions on Energy Conversion, Vol.35, No.3, 1171-1181, 2020
TOCF Based Control for Optimum Operation of a Grid Tied Solar PV System
In this work, a third order complex filter (TOCF) based control technique is used for a double stage grid tied solar photovoltaic (PV) system. The PV array generates the real power and provides it to the load connected and remaining to the utility. The voltage source converter functions as a distribution static compensator and improves power quality of the grid by mitigating harmonics, balancing of the grid currents with unity power factor. It also performs well under weak grid scenario like voltage distortion, grid faults, DC offset, voltage unbalances and swell/sag. The main objective of this work is positive sequence components extraction from unbalanced voltages for unit templates estimation and TOCF algorithm extracts the fundamental component of the load currents. A PV power term is applied for improved system performance. This work demonstrates the effectiveness of control algorithm at various dynamic conditions by simulating the behavior of the system in MATLAB. Tests are conducted on an experimental setup realized in the laboratory at different abnormal situations like load unbalancing, voltage unbalance, voltage distortions, voltage swell/sag, insolation change, DSTATCOM-PV mode and PV-DSTATCOM mode etc. The system operation is found satisfactory and distortion levels in grid currents are found in bounds, as suggested in IEEE standard-519.