On decentralized controllers for interconnected power systems
01 Nov 1985-International Journal of Systems Science (Taylor & Francis Group)-Vol. 16, Iss: 11, pp 1391-1407
TL;DR: In this article, a scheme for a decentralized controller based on the modelling of interaction in large interconnected power systems is proposed. But the performance of the proposed decentralized controller is comparable to that of a centralized controller.
Abstract: In this paper a scheme for a decentralized controller based on the modelling of interaction in large interconnected power systems is proposed. An example of a two-area power system is presented to illustrate the application of the proposed design procedure in both the continuous-time and discrete-time case. The computer simulation results revealed that the performance of the proposed decentralized controller is comparable to that of a centralized controller.
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01 Jan 2014
TL;DR: This chapter goes through the steps that one typically takes to optimize a CUDA Fortran application, and discusses at length how to efficiently access data from kernels, including topics of global memory data coalescing, use of on-chip shared memory, and the read-only constant and texture memories.
Abstract: This chapter goes through the steps that one typically takes to optimize a CUDA Fortran application. Reducing the overhead of transferring data between the host and device is discussed first in terms of reducing the amount of data transferred and making such transfers efficient and possible. Once the data are on the device, we discuss at length how to efficiently access these data from kernels, including topics of global memory data coalescing, use of on-chip shared memory, and the read-only constant and texture memories. The topic of launching kernels with enough parallelism, whether in the form of instruction-level or thread-level parallelism, is also discussed. The final section covers instruction optimization.
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TL;DR: In this article, the optimal control of linear time-invariant systems with respect to a quadratic performance criterion is discussed and an algorithm for computing FAST is presented.
Abstract: The optimal control of linear time-invariant systems with respect to a quadratic performance criterion is discussed. The problem is posed with the additional constraint that the control vector u(t) is a linear time-invariant function of the output vector y(t) (u(t) = -Fy(t)) rather than of the state vector x(t) . The performance criterion is then averaged, and algebraic necessary conditions for a minimizing F\ast are found. In addition, an algorithm for computing F\ast is presented.
906 citations
TL;DR: In this paper, a necessary and sufficient condition for the existence of local control laws with dynamic compensation to stabilize a given system is derived in terms of a new notion, called "fixed modes", which is a natural generalization of the well-known concept of uncontrollable modes and unobservable modes that occur in centralized control system problems.
Abstract: This paper considers the problem of stabilizing a linear time-invariant multivariable system by using several local feedback control laws. Each local feedback control law depends only on partial system outputs. A necessary and sufficient condition for the existence of local control laws with dynamic compensation to stabilize a given system is derived. This condition is stated in terms of a new notion, called "fixed modes," which is a natural generalization of the well-known concept of uncontrollable modes and unobservable modes that occur in centralized control system problems. A procedure that constructs a set of stabilizing feedback control laws is given.
906 citations
TL;DR: This paper records the development of a state variable model of the megawatt-frequency control problem of multiarea electric energy systems in a mathematical form necessary for application of theorems of modem optimal control theory.
Abstract: This paper records the development of a state variable model of the megawatt-frequency control problem of multiarea electric energy systems. The model is in a mathematical form necessary for application of theorems of modem optimal control theory.
668 citations
TL;DR: In this paper, the authors modify existing linear regulator and servomechanism theories to take into account the presence of persistent fluctuating disturbances and systematically exploit any useful effects that may be present in the action of external disturbances.
Abstract: Modern linear regulator and servomechanism theories (of the deterministic type) either ignore system disturbances altogether or assume they can be represented by initial conditions on the plant state vector. Controllers designed by such theories may fail to meet performance specifications when the system is subjected to persistently acting disturbances. In this paper, we show how one can modify existing regulator and servomechanism theories to take into account the presence of persistent fluctuating disturbances. By this means one can design a deterministic controller which consistently maintains set-point regulation, or servotracking, in the face of a bread class of realistic external disturbances. In addition, we show how one can systematically exploit any useful effects that may be present in the action of external disturbances.
565 citations
01 Jan 1975
TL;DR: Classes of large scale dynamic systems were discussed in the context of modern control theory in the technical fields of aeronautics, water resources and electric power.
Abstract: Classes of large scale dynamic systems were discussed in the context of modern control theory. Specific examples discussed were in the technical fields of aeronautics, water resources and electric power.
259 citations