Abstract
A nonlinear coordinated control of excitation and SVC of an electrical power system is proposed for transient stability, and voltage regulation enhancement after the occurrence of a large disturbance and a small perturbation. Using the concept of Immersion and Invariance (I&I) design methodology, the proposed nonlinear controller is used to not only achieve power angle stability, frequency and voltage regulation but also ensure that the closed-loop system is transiently and asymptotically stable. In order to show the effectiveness of the proposed controller design, the simulation results illustrate that, in spite of the case where a large perturbation occurs on the transmission line or there is a small perturbation to mechanical power inputs, the proposed controller can not only keep the system transiently stable but also simultaneously accomplish better dynamic properties of the system as compared to operation with the existing controllers designed through a coordinated passivation technique controller and a feedback linearization scheme, respectively.
Highlights
As a result of power systems with the rapid increase of the size and complexity, power system stability, including power angle stability as well as frequency and voltage regulation, is of great importance
Simulation results using a combination of generator excitation and Static Var Compensator (SVC) controllers in a single machine infinite bus (SMIB) system are shown using power angle stability, and voltage and frequency regulation to point out the system stability enhancement, in particular transient stability
We have shown that nonlinear coordinated generator excitation and SVC control in SMIB power systems can be effectively used to enhance the transient stability of power systems after the occurrence of a large disturbance and a small perturbation
Summary
As a result of power systems with the rapid increase of the size and complexity, power system stability, including power angle stability as well as frequency and voltage regulation, is of great importance. Great attention has been paid to the design of an advanced nonlinear controller design to improve power system stability margins and enhance controllability and increase power transfer capability in the literature for years. There have been numerous studies for improving power system stability, recently an effective approach to improving the stability of power systems uses generator excitation control in combination with Flexible AC Transmission Systems (FACTS) devices. FACTS devices [1, 2] are becoming increasingly important for improving the controllability of power flows and voltages as well as the stability of the power systems. FACTS devices include SVC, STATCOM, TCSC, SSSC, TCPAR, and UPFC, and these devices are often employed in interconnected and long-distance transmission systems to improve power flow, voltage control, interarea and system oscillations, reactive power control, and steady-state and dynamic stability. Among a family of these FACTS devices, Static Var Compensator (SVC) is of interest since it is used in power systems to regulate the system voltage and improve power system stability: in particular it is capable of rapidly injecting and absorbing active and reactive power in order to increase grid transfer capability through enhanced dynamic voltage stability, to provide smooth and rapid reactive power compensation for voltage support, and to improve both damping oscillations and transient stability [3,4,5,6,7]
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