Journal ArticleDOI
Nonlinear stabilizing control of multimachine systems
Qiang Lu,Yuan Zhang Sun +1 more
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TLDR
In this paper, a nonlinear decoupled optimal control based on differential geometric control theory for interconnected power systems is proposed, which is successfully applied to nonlinear steam valving control of multimachine systems.Abstract:
It is of great importance to improve stability as well as dynamic performances of power systems for both small and large disturbance. Such issues have received a great deal of attention and many contributions have been made to this objective. However, some of the design methods developed previously are based on second-order synchronous generator model, so excitation systems or/and governor systems could hardly be considered by them, the others based on linear models, which are set up by approximate linearizing at an equilibrium point of the system. Since, in fact, a power system is a nonlinear dynamic one, the controller designed by using the approximate linearized model may cause untolerable errors, while the state point of the system is changed away from the equilibrium point at which the linearization is realized. A new approach to nonlinear decoupled optimal control based on the differential geometric control theory for interconnected power systems is proposed. And it is successfully applied to nonlinear steam valving control of multimachine systems. For an m-machine system the optimal steam valving control law of the ith-machine can be expressed as ui= TS; ii(K1-M& 1+ K2 cw-+ K3; | wdt + TsiPei+ (Pmj-Pmjo) (18) where Mi inertia coefficient (in sec.) Tsi, time constant of servomotor and steam (in sec.) wi, speed (in per unit) Di damping coefficient Pei electrical power (in per unit) Pmi mechanical power (in per unit) and K1j, K2j, and K3j are optimal feedback gain coefficients.read more
Citations
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Journal ArticleDOI
Transient stability enhancement and voltage regulation of power systems
TL;DR: In this paper, the transient stability and voltage regulation of a single-machine-infinite-bus power system under the effects of a symmetrical three-phase short-circuit fault is detailed.
Journal ArticleDOI
Nonlinear decentralized control of large-scale power systems
Yi Guo,David J. Hill,Youyi Wang +2 more
TL;DR: This paper describes an application of nonlinear decentralized robust control (Guo, Jiang & Hill, 1998) to large-scale power systems and uses nonlinear bounds of generator interconnections to achieve less-conservative control gains.
Journal ArticleDOI
Dissipative Hamiltonian realization and energy-based L/sub 2/-disturbance attenuation control of multimachine power systems
TL;DR: The note investigates the energy-based control design of L/sub 2/-disturbance attenuation of multimachine power systems and proposes a decentralized simple control strategy.
Journal ArticleDOI
A particle-swarm-based approach of power system stability enhancement with unified power flow controller
TL;DR: In this paper, the use of the supplementary controllers of a unified power flow controller (UPFC) to damp low frequency oscillations in a weakly connected system is investigated, and the potential of the UPFC supplementary controllers to enhance the dynamic stability is evaluated by measuring the electromechanical controllability through singular value decomposition (SVD) analysis.
Journal ArticleDOI
Robust decentralized nonlinear controller design for multimachine power systems
TL;DR: Simulation results show that the proposed robust nonlinear decentralized controller can greatly enhance the transient stability of the system regardless of the network parameters, operating points and fault locations.
References
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Journal ArticleDOI
Concepts of Synchronous Machine Stability as Affected by Excitation Control
TL;DR: In this article, the stability of synchronous machines under small perturbations is explored by examining the case of a single machine connected to an infinite bus through external reactance, and the results are shown to be similar to ours.
Journal ArticleDOI
On the linear equivalents of nonlinear systems
TL;DR: In this article, a complete characterization of the class of nonlinear systems which are equivalent to controllable linear systems is obtained, and an equivalence relation is established for the systems x = f(x, u).
Proceedings ArticleDOI
Nonlinear feedback in robot arm control
TL;DR: In this article, a nonlinear feedback control for a general nonlinear system to be externally linearized and simultaneously output decoupled is proposed for implementation of an advanced dynamic control strategy for robot arms.
Journal ArticleDOI
The control of a synchronous machine using optimal control theory
TL;DR: In this article, the selection of stabilizing signals to improve power system dynamic behavior is presented, and the closed-loop performance of this nonlinear system model with the derived linear optimal controller is evaluated for a wide range of input disturbances and operating conditions which include three phase fault studies with autoreclosure.
Journal ArticleDOI
Global external linearization of nonlinear systems via feedback
TL;DR: In this article, necessary and sufficient conditions for affine nonlinear systems to be globally feedback equivalent to a controllable linear system over an open subset V of Rn are presented, when V equals Rn.