A ROBUST PSS AUTOMATED DESIGN BASED ON ADVANCED H_2 AND H∞ FREQUENCY CONTROL TECHNIQUES TO IMPROVE POWER SYSTEM STABILITY

摘要

This paper proposes the automated design of power system stabilizer (PSS) based on robust loop-shaping H∞ controller (HinfPSS). The control objective is to enhance the stability and to improve the dynamic response of a single-machine power system operating in different conditions. Simulation results show that this control strategy is very robust, flexible and alternative performance. The nonlinear model of the power system is constructed with the differential equations. In other part, the Linear Quadratic - Gaussian (LQG) control scheme (has the same structure as the traditional Russian AVRPSS [4]), consists of an optimal state-feedback gain and a KALMAN state estimator, and equivalently in this paper on a robust H_2 controller 'H2PSS', who was applied as a test control system in this paper. A detailed sensitivity analysis for a one-machine-infinite-bus system reveals that the fuzzy sliding-mode power system stabilizer is quite robust to wide variations in operating load and system parameters. Stabilizers suggested in this work have the same structure as the traditional Russian PSS. The simulation results show that a highs performances and robustness using the first regulation technique method (HinfPSS) in comparison with using robust H2PSS, due to the initial physical (real) non-linear proprieties of power system.