Damping of Low Frequency Oscillations in power systems with neuro-fuzzy UPFC controller

Abstract

Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in order to dominance to power system disturbances as an example of change in mechanical input power. In the recent past Power System Stabilizer (PSS) was used to damp LFO. FACTs devices, such as Unified Power Flow Controller (UPFC), can control power flow, reduce sub-synchronous resonance and increase transient stability. So UPFC may be used to damp LFO instead of PSS. UPFC damps LFO through direct control of voltage and power. In this research the linearized model of synchronous machine (Heffron-Philips) connected to infinite bus (Single Machine-Infinite Bus: SMIB) with UPFC is used and also in order to damp LFO, adaptive neuro-fuzzy controller for UPFC is designed and simulated. Simulation is performed for various types of loads and for different disturbances. Simulation results show good performance of neuro-fuzzy controller in damping LFO.

A new hybrid GA–GSA algorithm for tuning damping controller parameters for a unified power flow controller

“…Using the above said three algorithms namely GA, GSA and proposed hybrid GA-GSA, the above parameters of the controller are obtained [11].…”

“…Tuning of the damping controller of the UPFC is an uphill task as the structure is highly complex [7,8]. The literature study shows that the conventional techniques are very time consuming, convergence rate is slow, being iterative, requires substantial computational burden [9][10][11].…”

Investigation and damping of low‐frequency oscillations of stochastic solar penetrated power system by optimal dual UPFC

“…PSO optimisation technique is being used for tuning of damping controller parameters [26, 27] with UPFC. In [28–30], neuro‐fuzzy, hybrid GA–GSA, and GSA techniques have been used for UPFC damping controller design. For the same kind of many optimisation problems the performance of PSO is better than GA and does not have the difficulties as encountered by the GA [31].…”