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Journal ArticleDOI: 10.1016/S0378-7796(96)01058-9

Application of an auxiliary controlled static var system for damping subsynchronous resonance in power systems

01 Jun 1996-Electric Power Systems Research (Elsevier)-Vol. 37, Iss: 3, pp 189-201
Abstract: In this paper a novel concept of a static var system (SVS) auxiliary controller application for damping subsynchronous resonance in power systems has been proposed and demonstrated. An SVS controller, known as the combined reactive power and frequency (CRPF) auxiliary controller has been developed and incorporated in the SVS control system located at the middle of a series compensated long transmission line. The studies are conducted on a system having a similar spread of the torsional modes as the first IEEE benchmark model. The proposed SVS auxiliary controller stabilizes all the torsional modes over a wide operating range. A digital computer simulation study has been performed, using a nonlinear system model, to illustrate the effectiveness of the proposed SVS auxiliary controller.

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Topics: Control theory (56%), Electric power system (51%)
Citations
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Proceedings ArticleDOI: 10.1109/POWERI.2006.1632613
Narendra Kumar1Institutions (1)
05 Jun 2006-
Abstract: In this paper, a new static VAr system (SVS) control scheme for damping torsional modes due to subsynchronous resonance (SSR) in a series compensated power system has been developed. The proposed scheme, called as the Narendra Kumar-subsynchronous resonance (NK-SSR) damping scheme, utilizes the effectiveness of combined reactive power and frequency (CRPF) SVS auxiliary controller in coordination with an induction machine-damping unit (IMDU) coupled to the T-G shaft. The studies are conducted on the first IEEE benchmark model. The scheme stabilizes all the torsional modes over a wide operating range of power transfer. The digital computer simulation study, using a nonlinear system model exhibits a remarkable improvement in the system transient performance. The optimal location of IMDU along the T-G shaft has been determined by performing eigen value analysis. It is found that locating IMDU after the IP turbine yields the maximum damping effect.

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10 Citations


Journal ArticleDOI: 10.1016/J.EPSR.2013.09.014
Xinyao Zhu1, Haishun Sun1, Jinyu Wen1, Shijie Cheng1Institutions (1)
Abstract: Eigenvalue analysis is extensively used in power system subsynchronous resonance (SSR) study. For SSR analysis, dynamic representation of the network is required, whereas both the state variables selection and the state equations formation for the network are difficult to process especially when the system configuration is subjected to variations. Hence, it is difficult to use eigenvalue analysis for multi-machine system SSR study. This paper proposed a new method to deal with this problem. The method proposed provides a way to select network state variables without using the network proper tree, thus complex topology analysis is avoided. Meanwhile, the network state equations can be constructed and modified easily by using the defined generalized capacitor-branch admittance matrix. Therefore, this method is well suited to construct the network state equations of multi-machine systems for eigenvalue analysis of the SSR problem. The proposed method has been used in the eigenvalue analysis of a multi-machine power system in China confronting with SSR problems, and the effectiveness of the proposed method has been verified by time domain simulations.

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Topics: State variable (57%), Admittance parameters (50%)

7 Citations


Open access
01 Jan 2009-
Abstract: In the present paper, a new scheme for damping torsional modes in a series compensated power system has been developed. The proposed scheme, utilizes the effectiveness of combined active power and frequency (C.A.P.F.) SVS auxiliary controller in co-ordination with an induction machine damping unit coupled to the T-G shaft. Studies are conducted on the first IEEE benchmark model. The damping scheme stabilizes all the torsional modes over a wide operating range of power transfer. SVS is installed at the middle of transmission line to optimize the power transfer capability. Also the optimal location of IMDU along the T-G shaft has been determined by using eigenvalue analysis. It is found that locating IMDU after the IP turbine yields the maximum damping effect.

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7 Citations


Proceedings ArticleDOI: 10.1109/PESTSE.2014.6805280
Abstract: Subsynchronous oscillations (SSO), especially, subsynchronous resonance are potential problems in series compensated power system. A fixed speed wind farm employing single cage induction generator (IG) and double cage IG connected to series compensated line are prone to SSR problem. This paper presents some investigations on SSO resulting from induction generator effect (IGE) with the wind turbine generator (WTG) modelled either as single cage IG or double cage IG. Eigenvalue analysis is carried out for various levels of series compensation for different sizes of wind farm with varying power outputs. Eigenvalue analysis is validated by the electromagnetic transient simulations using PSCAD/EMTDC software. The possibility of steady state SSR (IGE) and transient SSR is investigated in depth using PSCAD/EMTDC for the modified IEEE first bench mark (MFBM) model. SVC is employed for mitigating SSR. A new voltage regulator (VR) model of SVC is proposed and linear state space model of SVC is developed. Eigenvalue analysis conducted with the proposed voltage regulator reveals that the proposed VR model is more effective in mitigating SSR compared to VR models that are reported in the literature.

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Topics: Induction generator (54%)

6 Citations


Open accessJournal ArticleDOI: 10.11591/IJEECS.V12.I9.PP6551-6559
Abstract: The sub synchronous resonance (SSR) is a substantial problem in power system having a steam turbine generator connected to a series compensated transmission system. Flexible AC transmission systems (FACTS) controllers are widely applied to mitigate SSR. In this paper, a bus voltage and line current (BVLC) supplementary subsynchronous damping controller (SSDC) is proposed to alleviate subsynchronous resonance (SSR) and damping power system oscillations in a power system. Both eigenvalue investigation and time-domain simulation results verify that the proposed method can damp torsional oscillations of the power system with SVS bus voltage and line current (BVLC) supplementary controller. The results demonstrate that the proposed controller has a successful performance in minimizing the SSR. It is shown that the controller is able to stabilize all unstable modes. The study is performed on the system adapted from the IEEE first benchmark model. All the simulations are carried out in MATLAB/SIMULINK environment.

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Topics: Electric power system (54%), Control theory (53%)

3 Citations


References
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Open accessBook
01 Dec 1989-
Abstract: This book provides an introduction to subsynchronous resonance in power systems and includes material on system modeling, system parameters, and system analysis.

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321 Citations


Journal ArticleDOI: 10.1109/59.260815
E.-Z. Zhou1Institutions (1)
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. >

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Topics: Damping torque (64%), Electric power system (58%), AC power (55%) ...read more

188 Citations


Open accessJournal ArticleDOI: 10.1109/59.76687
K.R. Padiyar1, Rajiv K. Varma2Institutions (2)
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. >

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Topics: Damping torque (68%), Maximum power transfer theorem (53%), Torque (53%) ...read more

180 Citations



Journal ArticleDOI: 10.1109/60.4192
L. Wang1, Yuan-Yih Hsu1Institutions (1)
Abstract: The results of a comparative study on the application of two countermeasures, i.e. the excitation controller and the static VAr compensator (SVC), for damping of subsynchronous resonance (SSR) are presented. To stabilize all the SSR modes, a unified approach based on modal control theory is proposed for the design of the excitation controller and the SVC, which are essentially dynamic output feedback compensators. The two damping schemes differ in the way they modulate the reactive power flow in the system to damp out the subsynchronous oscillations. To demonstrate the effectiveness of the proposed damping schemes under disturbance conditions, time-domain simulations based on a nonlinear system model are also performed. The relative merits of the two countermeasures are compared with respect to their validities under various loading conditions and different degrees of series compensations and their capabilities to expand the stable region on the real-capacitive reactance plane. >

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Topics: Static VAR compensator (57%), Control theory (52%)

60 Citations


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