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ABSTRACT: The continued interest in the distributed generation (DG) sources in recent years is leading to the growth of a number of generators connected to distribution networks. The steady-state voltage rise resulting from the connection of these generators can be a major obstacle at the lower voltage levels. Present network design practice is to limit the generator capacity to a level at which the upper voltage limit is not exceeded. This reduces the efficiency of DG system. This paper proposes a coordinated voltage control scheme using fuzzy logic based power factor controller, for distribution network with multiple Distributed generation systems. In the proposed scheme individual generators participate in voltage regulation of the distribution system, based on their participation factor determined using sensitivity analysis. The simulation results presented in the paper show the effectiveness of the method.
Transmission and Distribution Conference and Exposition, 2010 IEEE PES; 05/2010
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Lecture Notes in Engineering and Computer Science. 01/2010;
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ABSTRACT: Distributed generation (DG) is predicted to play an important role in electric power system in the near future. The insertion of DG system into existing distribution network has great impact on real-time system operation and planning. It is widely accepted that micro turbine generation (MTG) systems are currently attracting lot of attention to meet customers need in the distributed power generation market In order to investigate the performance of microturbine generation systems their efficient modeling is required. This paper presents a dynamic model of a MTG system, suitable for grid connection/islanding operation. The presented model allows the bidirectional power flow between grid and MTG system. The components of the system are built from the dynamics of each part with their interconnections. The control strategies for both grid connected and intentional islanding operation mode of a DG system are also given.
Industrial Technology, 2006. ICIT 2006. IEEE International Conference on; 01/2007
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ABSTRACT: This paper presents an analytical, linear, state-space model of a thyristor-controlled series capacitor (TCSC). First, a simplified fundamental frequency model of TCSC is proposed and the model results are verified. Using frequency response of the nonlinear TCSC segment, a simplified nonlinear state-space model is derived, where the frequency of the dominant TCSC complex poles shows linear dependence on the firing angle. The nonlinear element is linearised and linked with the ac network model and the TCSC controller model that also includes a phase-locked-loop (PLL) model. The model is implemented in MATLAB and verified against PSCAD/EMTDC in the time and frequency domains for a range of operating conditions. The model is sufficiently accurate for most control design applications and practical stability issues in the subsynchronous range.
IEEE Transactions on Power Delivery 05/2005; · 1.35 Impact Factor
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ABSTRACT: The extent and nature of control interaction between a power system stabiliser and a static synchronous series compensator (SSSC) has been studied. Countermeasures are suggested to reduce such interactions. The study system considered is the IEEE first benchmark model for subsynchronous resonance. The SSSC is used as a fixed compensator and the DC-link voltage of the SSSC is regulated by a simple PI controller. Stability of the system is determined from eigenvalue analysis. Nonlinear simulations are performed to verify the results of eigenvalue analysis.
IEE Proceedings - Generation Transmission and Distribution 12/2002; · 0.48 Impact Factor
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ABSTRACT: In this paper a static synchronous series compensator (SSSC) along with a fixed capacitor is used to avoid torsional mode instability in a series compensated transmission system. A 48-step harmonic neutralized inverter is used for the realization of the SSSC. The system under consideration is the IEEE first benchmark model on SSR analysis. The system stability is studied both through eigenvalue analysis and EMTDC/PSCAD simulation studies. It is shown that the combination of the SSSC and the fixed capacitor improves the synchronizing power coefflcient. The presence of the fixed capacitor ensures increased damping of small signal oscillations. At higher levels of fixed capacitor compensation, a damping controller is required to stabilize the torsional modes of SSR.
IEEE Power Engineering Review 11/2002; 22(10):63-63.
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ABSTRACT: In this paper, the H<sub>∞</sub> optimal control theory has
been used to design a robust controller for regulating DC link voltage
of a static synchronous series compensator (SSSC). Subsynchronous
resonance (SSR) analysis of the robust SSSC compensated power system is
presented. The power system used in this study is the IEEE first
benchmark model for SSR analysis. To design the robust controller the
nominal transfer function is reduced to such an order that the essential
dynamic characteristics of the system are retained in the frequency
range of interest. Eigenvalue analysis and nonlinear simulation using
PSCAD/EMTDC have shown that the controller can provide satisfactory
torsional performance under a wide variation in the operating
conditions. A damping controller is also proposed to increase the
damping of the torsional modes
Power Engineering Society Winter Meeting, 2001. IEEE; 02/2001
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ABSTRACT: In this paper application of voltage source inverter (VSI) based series compensator, known as static synchronous series compensator (SSSC), is studied. A power flow controller is designed for a 48-step SSSC. Small signal and large signal torsional characteristics of an SSSC compensated power system are studied. The effects of DC link capacitor of the SSSC on torsional modes are studied. An integral state feedback controller is proposed to improve the torsional characteristics of the SSSC. The torsional characteristics are studied through eigenvalue analysis and the results are validated through PSCAD/EMTDC simulation studies.
Industrial Technology 2000. Proceedings of IEEE International Conference on; 02/2000
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Journal of the Indian Medical Association 07/1982; 78(12):193-5.
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Journal of the Indian Medical Association 02/1979; 72(1):4-9.
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ABSTRACT: In this paper a power flow controller is designed for a 48-step static synchronous series compensator (SSSC). Torsional characteristics of an SSSC compensated power system are studied and compared to a fixed capacitor compensated power system. The effects of dc link capacitor of the SSSC on torsional modes are studied. An integral state feedback controller is proposed to improve the torsional characteristics of the SSSC. The torsional characteristics are studied through eigenvalue analysis and the results are validated through PSCAD/EMTDC simulation studies.
Electric Power Systems Research.
