Reconfigurable Fault-tolerant PSS and FACTS Controllers

Abstract

This article presents a design technique for reconfigurable fault-tolerant controllers acting on a flexible AC transmission system power system. A classical power system stabilizer of the generator excitation system and a controller of the thyristor-controlled series capacitor are considered. Sound operation of both controllers yields the required dynamic performance of the system. However, a faulty condition signifies a degraded control signal of one controller at a time. The proposed scheme suggests that the parameters of one controller switch to some predetermined values if the other controller is faulty with any degradation percentage. Maintaining a specific settling time of the dynamic response is assured against continual degradation of either controller as the design is carried out through the Kharitonov theorem and particle swarm optimization. The proposed design represents an indirect adaptive power system stabilizer. Simulation results denote distinct effectiveness of the proposed design in maintaining the desired system performance under sound and different faulty conditions.

Decentralised design of robust multi‐objective PSSs:D‐decomposition approach

“…The second aspect considers robustness from the view point of disturbance rejection [7]. Various formulations of uncertain systems were considered including μ ‐synthesis [8–12], Lyapunov state‐space‐based procedures [13–15] and interval polynomials [16–22]. These approximations are basically created to either evaluate system robustness or synthesise PSSs subject to parametric uncertainties.…”

Improved load frequency characteristics with genetically tuned supercapacitor energy storage in interconnected power system

“…Some of these devices mean ecological worries by spillage of unsafe gasses amid their operation. There has been a trend in the recent past to incorporate various flexible AC transmission systems (FACTS) devices as discussed in Soliman et al (2010). Various control strategies including evolutionary methods are incorporated to control the dynamics and power constraints as discussed in Soliman et al (2009).…”

Robust stabilisation of power systems with random abrupt changes

“…The designs of robust PSS have been investigated and studied by several researchers [2–4]. The improved design techniques for the robust fault‐tolerant PSS are developed in [5, 6].…”