Optimization and coordination of damping controls for improving system dynamic performance

Abstract

This paper presents a global tuning procedure for FACTS Device Stabilizers (FDS) and Power System Stabilizers (PSS) in a multi-machine power system using a parameter-constrained nonlinear optimization algorithm implemented in a simulation program. This algorithm deals with such an optimization problem by solving a sequential quadratic programming using the dual algorithm. The main objective of this procedure is to simultaneously optimize pre-selected parameters of the FDSs and PSSs having fixed parameters in coping with the complex nonlinear nature of the power system. By minimizing a nonexplicit target function in which the oscillatory rotor modes of the generators involved and swing characteristics between areas are included, interactions among the FACTS controls under transient conditions in the multi-machine system are improved. A multi-machine power system equipped with a TCSC and an SVC as well as three PSSs is applied to demonstrate the efficiency and robustness of the tuning procedure presented. The results obtained from simulations validate the improvement in damping of overall power oscillations in the system in an optimal and globally coordinated manner. The simulations also show that the stabilizers tuned are robust in providing adequate damping for a range of conditions in the system.

Improvement of Power System Stability by Static Var Compensator and Tuning Employing Genetic Algorithm

“…The idea is to have an adjustable device impedance ( ) SVC X , it consists of Thyristor Switched Capacitor (TSC) and Thyristor Controlled Reactors (TCR) as shown in Figure 4 [5]- [9]. The SVC can be defined than, as a controlled susceptance (inverse of the impedance) called SVC…”

Hybrid control of a multi‐area multi‐machine power system with FACTS devices using non‐linear modelling

“…Power system stabiliser (PSS) which can reconcile the contrary exciter performance with stability is a potential solution for the problem [5][6][7]. However, PSS is far from being a settling solution, as it is marred by insufficient damping in inter-area modes [8], necessitating more efficient solutions. With high voltage power electronic techniques becoming competitive and having broad area of operation; flexible AC transmission system (FACTS) devices are earning growing acceptance.…”

Wide-area measurement based nonlinear control of a parallel AC/DC power system

“…Unfortunately, conventional controllers are designed by linearizing the strong nonlinear power system around the steady state operation point approximately. When the operation condition varies, conventional controllers may not be capable of enhancing system transient performances [3,4]. Sometimes, the linear control strategy based on the normal operation point may even make the system deviate from the equilibrium point [5] under severe disturbances.…”