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Proceedings ArticleDOI

A Control Strategy for Subsynchronous Resonance Under Varying Degree of Series Compensation

TL;DR: Eigenvalue analysis has been carried out for the linearized power system model to investigate the unstable torsional modes and all results obtained at various levels of series compensation approves usefulness of the SVS controller under consideration.
Abstract: A control strategy is obtained for restraining torsional oscillations owing to SSR over a varying degree of series compensation. A mid-point located SVS equipped with a joint supportive signal composed of line current and voltage deviations has been utilized to damp out torsional oscillations grown due to sub-synchronous resonance. The test system considered for analysis of the usefulness of the controller under consideration is built using IEEE first benchmark model having SVS connected at the mid-point of the transmission line. Eigenvalue analysis has been carried out for the linearized power system model to investigate the unstable torsional modes. To explicate the relative assessment of the system under consideration three secondary controllers are considered. To illustrate the robustness of proposed controller a comprehensive power system model is used which is described by various subsystems, their relations are been described in detail with accuracy. The eigen value analysis illustrates the efficacy of the Combined Line Current and Voltage (CLCV) SVS controller for different percentage of the series compensation as compared to the cases where no controller is used and case where only Line Current SVS controller, Voltage SVS controller are used. All results obtained at various levels of series compensation approves usefulness of the SVS controller under consideration.
References
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Journal ArticleDOI
TL;DR: The results of the subsynchronous resonance test conducted on the number 2 turbine-generator at the Southern California Edison Company Mohave Generating Station are presented and discussed in this paper.
Abstract: The results of the subsynchronous resonance test conducted on the number 2 turbine-generator at the Southern California Edison Company Mohave Generating Station are presented and discussed Comparisons are made between measured and calculated torsional natural frequencies and mode shapes, and the damping associated with each torsional mode stimulated is presented at various loads In addition, the methods of stimulating the mechanical torsionals of the turbine-generator set are discussed along with a description of the instrumention system that was used to obtain the data

225 citations


"A Control Strategy for Subsynchrono..." refers background in this paper

  • ...Though while decreasing the electrical length in between the generating station and load points series capacitive compensation can make power system susceptible to subsynchronous resonance event as detected at Mohave Generating Station in Southern Nevada in 1970 [1]....

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Journal ArticleDOI
TL;DR: The history of subsynchronous resonance analysis by the Navajo Project leading to the selection of equipment to be applied at Navajo is presented in this paper, where analytical techniques used, potential problems discovered, solutions considered and solutions being applied are reviewed.
Abstract: The history of subsynchronous resonance analysis by the Navajo Project leading to the selection of equipment to be applied at Navajo is presented. The analytical techniques used, potential problems discovered, solutions considered and solutions being applied are reviewed. This represents the first complete study of subsynchronous resonance problems on a particular system leading to selection of specific equipment to be applied as a solution to the problem. This information should be of great interest to those studying the subsynchronous resonance problem on other systems.

137 citations


"A Control Strategy for Subsynchrono..." refers background in this paper

  • ...Pole face amortisseurs, SEDC, SMF relay, SSR monitor, static subsynchronous resonance filter (SRF) and static machine frequency (SMF) relay are few technologies proposed [3-5]....

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Journal ArticleDOI
TL;DR: In this article, the authors proposed a framework for the selection of optimal configuration of line compensation devices, such as TCSC and conventional fixed series capacitors, for reducing the risk of subsynchronous resonance (SSR) in the network while maintaining required power transfer.
Abstract: The paper proposes a framework for the selection of optimal configuration of line compensation devices, thyristor controlled series capacitors (TCSC) and conventional fixed series capacitors, for reducing the risk of subsynchronous resonance (SSR) in the network while maintaining required power transfer. The methodology developed in the paper is based on the robust risk evaluation of SSR that takes into consideration the severity of subsynchronous resonance and probability of its occurrence. The subsynchronous resonance risk index developed previously is used to assess the severity of subsynchronous resonance. The line outage model is employed to determine the probability of contingencies potentially leading to subsynchronous resonance. It is demonstrated that with relatively small participation of TCSC, even with the most basic control, in series compensation of lines, the risk of SSR can be successfully managed.

30 citations

Journal ArticleDOI
C. E. J. Bowler1, J. A. Demcko1, L. L. Mankoff1, W. C. Kotheimer1, D. Cordray1 
TL;DR: A Subsynchronous Resonance (SSR) Protective relay was first applied at the Navajo Power Plant in conjunction with other primary SSR protective means as mentioned in this paper, which was described in detail in the paper.
Abstract: A Subsynchronous Resonance (SSR) Protective relay first applied at the Navajo Plant, in conjunction with other primary SSR protective means, is described.

23 citations

Journal ArticleDOI
TL;DR: The paper presents oscillograms from a test program which includes symmetry checks and behavioral checks against well known waveforms of hunting oscillations, synchronization out-of-phase torques, and subsynchronous resonance phenomena.
Abstract: The behavior of a small power system consisting of two interconnected generators is simulated in real-time by a prototype digital transient network analyzer (TNA). The prototype digital TNA consists of two computational modules and one I/O module. The modules communicate with each other through ribbon cables. Each computational module simulates one turbo-generator, its transformer, its governor, exciter, and power system stabilizer systems. The numerical integration is shared by two TMS320C30 DSPs at a step-size of 100 /spl mu/s in realtime. The I/O module post-processes the state variables and presents selected information for analog display. The paper presents oscillograms from a test program which includes symmetry checks and behavioral checks against well known waveforms of hunting oscillations, synchronization out-of-phase torques, and subsynchronous resonance phenomena. The success of the digital TNA depends on: (a) the theoretical method of decoupled partitioning so that different portions of the power system can be allocated to different DSP-modules, (b) the architecture of the DSP-modules which can communicate the numerical integration results of one module to its contiguous neighbors with minimum delay. >

7 citations


Additional excerpts

  • ...Turbine mechanical model from [10] is utilized for thorough analysis and linearized state space derivations of same is specified as: x = [A ]x + [B ]u + [B ]u 4 y = [C ]x 5 where x = [∆δ ∆δ ∆δ ∆δ ∆δ ∆δ ∆ω ∆ω ∆ω ∆ω ∆ω ∆ω ]′ u = ∆I ∆I ′ u = ∆i ∆i ′ y = [∆δ ∆ω ] ′...

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