Static var system auxiliary controllers for transient stability improvement of power systems
01 Mar 1996-Electric Machines and Power Systems (Taylor & Francis Group)-Vol. 24, Iss: 2, pp 171-187
TL;DR: In this paper, a comparative performance evaluation of SVS auxiliary controllers for transient stability enhancement of long transmission lines over a wide operating range is presented, where the SVS has been considered located at the middle of the transmission line.
Abstract: The paper presents a comparative performance evaluation of SVS auxiliary controllers for transient stability enhancement of long transmission lines over a wide operating range. The SVS has been considered located at the middle of the transmission line. The application of the auxiliary controllers considerably enhances the system damping and unstable system modes are stabilized. A new controller, namely Combined Reactive Power and Frequency (C.R.P.F.) auxiliary controller, has been developed for the SVS located at the middle of the transmission line. To illustrate the comparative effectiveness of the auxiliary controllers under disturbance condition, a digital computer simulation study has been performed.
Citations
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TL;DR: In this paper, the authors proposed a controlled series compensation for enhancing the power transfer capability of transmission line in coordination with SVS (double order static var system) auxiliary controller and induction machine for repressing the torsional oscillations in power systems.
12 citations
01 Nov 2014
TL;DR: In this paper, a method is proposed to select supplementary signals for a static var compensator in IEEE first benchmark model, where different input output controllability analyses are used to assess the most appropriate supplementary signals to achieve effective damping of torsional oscillations.
Abstract: A method is proposed in this paper to select supplementary signals for a static var compensator in IEEE first benchmark model. Different input output controllability analyses are used to assess the most appropriate supplementary signals for the static var compensator (SVC) for achieving effective damping of torsional oscillations. After placing the SVCs based on their primary functions, the most appropriate input signal for supplementary controller is also selected. The eigenvalues and hankel singular values of the system are computed incorporating various supplementary signals in the SVC for selecting the best supplementary signal.
1 citations
Cites background from "Static var system auxiliary control..."
...Also, there are two possible ways to check the observability of the above system (17): • (A,C) is observable if and only if matrix Ψ,defined as Ψ= has full rank n. • (A,C) is observable if and only if the observability Gramian matrix defined as has full rank n and, thus, is positive definite....
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References
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TL;DR: In this paper, a theory for analyzing power system damping enhancement by application of static VAr compensators (SVCs) has been developed using the equal area criterion, where the SVC reactive power output at discrete points is determined from the power deviation on a transmission line.
Abstract: A theory for analyzing power system damping enhancement by application of static VAr compensators (SVCs) has been developed using the equal area criterion. Some fundamental issues, such as the effect of SVCs on a power system, how to control an SVC to improve system damping, and the differences between continuous and discontinuous control of SVC reactive power to achieve the maximum damping improvement, are discussed. A discontinuous SVC reactive power output at discrete points is determined from the power deviation on a transmission line. Time-domain simulations of the application of this approach to a one-machine system to increase swing oscillation damping and to a four-machine system to increase the damping of an interarea oscillation mode demonstrate that the theory and method can be applied to solve practical power system damping problems. >
193 citations
TL;DR: In this paper, the use of damping torque technique to examine the efficacy of various control signals for reactive power modulation of a midpoint-located static VAr system (SVS) in enhancing the power transfer capability of long transmission lines is considered.
Abstract: The use of a damping torque technique to examine the efficacy of various control signals, for reactive power modulation of a midpoint-located static VAr system (SVS) in enhancing the power transfer capability of long transmission lines is considered. A new auxiliary signal, the computed internal frequency (CIF), is proposed which synthesizes the internal voltage frequency of the remote generator from electrical measurements at the SVS bus. It is demonstrated that this signal is far superior to other conventional auxiliary control signals in that it allows full utilization of the network transmission capacity. The damping torque results are correlated with those obtained from eigenvalue analysis. >
186 citations
TL;DR: In this article, a new SVC (static VAR compensation) control for damping of power system oscillations has been developed, which uses a phase angle signal estimated from the measurement of voltage and power at the SVC location.
Abstract: A new SVC (static VAR compensation) control for damping of power system oscillations has been developed. To increase system damping an SVC uses a phase angle signal estimated from the measurement of voltage and power at the SVC location. By means of an optimization and identification procedure, optimized design of the damping control with various control concepts can be determined, taking into account nonlinear power systems. As a result of this method it is possible to increase power system damping considerably, in particular in critical situations close to the stability limit, using only locally measured state variables at the SVC, thus leading to an increase in the transmission capability of the power system. >
151 citations
TL;DR: In this article, the static compensator and the excitation system control parameters are chosen in a coordinated manner from the stability limit plots, the extension of stability limits with a Static Compensator are quantised, later a second compensator is included for improving the system performance.
Abstract: This paper deals with the dynamic stability of long distance a.c. transmission systems operating at above 1 surge impedance loading and compensated entirely by automatically controlled shunt inductance device referred to as Static Compensators. Generalised system equations in the form X = AX, with a careful choice of state variables are developed via the subsystem concept and the eigenvalue technique used to establish the stability limits. The static compensator and the excitation system control parameters are chosen in a coordinated manner from the stability limit plots, the extension of stability limits with a Static Compensator are quantised, later a second compensator is included for improving the system performance and interaction studies.
37 citations
TL;DR: In this paper, a variable structure static VAR stabilizer using a sliding mode control technique is proposed to constrain the system motion to a state trajectory, and provides greater robustness to plant parameter variations than classical control schemes.
7 citations