This paper presents the improvement of transient stability of a multi-machine power system with a STATCOM. Transient stability improvement is essential from the view point of maintaining system security that is the incidence of a fault should not lead to tripping of generating unit due to loss of synchronism. Static synchronous compensator is widely used in power system to control power by inje...

Long distance AC transmission is often subject to stability problems , which limits the transmission capability.Large interconnected power systems often suffer from weakly damped swings between synchronous generators and subsystems.This paper presents two methods , based on the use of nonlinear system model , to improve transient stability and damping of power swings using UPFC. A statevariable...

This report concentrates on presenting transient stability and power ow models of Thyristor Controlled Reactor (TCR) and Voltage Sourced Inverter (VSI) based Flexible AC Transmission System (FACTS) Controllers. Appropriate models for voltage and angle stability studies are discussed in detail for the Static Var Compensator (SVC), the Thyristor Controlled Series Compensator (TCSC), the Static Va...

Numerical modeling of open channel ̄ows with shocks using explicit ®nite di€erence schemes is constrained by the choice of time step, which is limited by the CFL stability criteria. To overcome this limitation, in this work we introduce the application of a multiple grid algorithm to the ®eld of computational hydraulics. By coupling this algorithm to a second-order accurate MacCormack scheme, w...

Dynamical behavior of some electronic circuits involves signals with widely separated rates of variation. Numerical solution of ordinary differential systems describing such circuits may be achieved in an efficient way using multi-rate methods, which use different step sizes for each subsystem. In this paper we will test the performance of two multi-rate Runge-Kutta algorithms in terms of numer...

This paper offers non-linear control for enhancing the transient stability in power systems containing a photovoltaic (PV) and doubly fed induction generator (DFIG) by energy function (TEF) method finite-time observers. At first, TEF is utilized to enhance system PV, DFIG, synchronous (SG) constructing hybrid Lyapunov function. Then, derivative terms are estimated with The main contribution of ...