Optimal coordinated tuning of power system stabilizers and wide‐area measurement‐based fractional‐order <scp>PID</scp> controller of large‐scale <scp>PV</scp> farms for <scp>LFO</scp> damping in smart grids

Abstract

In recent years, the installation of large-scale photovoltaic (PV) farms (LPFs) is expanding around the world. Due to the addition of LPFs to the power system and increasing their penetration level, they should be able to undertake the most common tasks of conventional power plants in coordinated with other devices in the power system. Damping of low-frequency oscillation (LFO) through the power system stabilizers (PSSs) is regarded as one of these common tasks. Therefore, the LPF must be able to damp the LFO in coordinated with the PSSs. This paper proposes a new method for LFO damping in power system which is based on optimal coordination of wide-area measurement-based fractional-order proportional-integral-derivative (WMFOPID) controller as an auxiliary controller for LPF and PSSs of synchronous generators. The performance evaluation of the optimal coordinated WMFOPID controller is performed in a smart two-area power system and is compared with other controllers in terms of LFO damping. The simulation results show the better performance of the optimal coordinated WMFOPID controller compared to the uncoordinated case and determine the effectiveness of the novel proposed method for LFO damping. The results also show the high robustness of the optimal WMFOPID controller compared to previous controllers, against some uncertainties in the power system.