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Journal ArticleDOI: 10.1080/07313569608955693

A flexible ac transmission system “steady state and dynamic performance analysis”

01 Jul 1996-Electric Machines and Power Systems (Taylor & Francis Group)-Vol. 24, Iss: 5, pp 541-553
Abstract: The steady state and dynamic performance of a flexible AC transmission system (FACTS) with midpoint located SVS has been presented with and without series compensation. The maximum capacitor of SVS branch in case of line without series compensation, is split into two locations. Two third of it is at the sending end for the purpose of series compensation and one third remains at SVS branch. This has the advantage of reduced ‘δ’ without upsetting greatly the cost economy of equipment. The degree of series compensation thus obtained is used to evaluate the steady state and dynamic performance of series compensated transmission line. The results are then compared over a wide operating range. The line reactive power auxiliary controller and bus frequency auxiliary controller are employed in the SVS control system to stabilize the unstable system modes and the performance of the two auxiliary controllers is also compared over wide operating conditions. It has been established here that such a series ca... more

Topics: Flexible AC transmission system (59%), AC power (53%), Steady state (electronics) (53%) more

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. > more

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

180 Citations

Journal ArticleDOI: 10.1109/TPAS.1982.317077
R. T. Byerly1, D. T. Poznaniak1, E. R. Taylor1Institutions (1)
Abstract: This paper concerns the application of static reactive compensators (SVCs) to Power transmission systems. Emphasis is placed on stability, and it is shown that SVCs can provide significant benefits in terms of increased transient stabilty liisand improved damping for synchronizing power flow oscillations. The paper includes descriptions Of static VAR compensators, with technical and economic comparisons of different compensators. An SVC system study model is presented which includes provision for modulating reactive compensation in response to a variety of system functions. Study procedures are illustrated which relate sYstem stability objectives to general specifications of SVCs, indluding their locations, regulating slopes, peak reactive power requirements, and modulation control. more

Topics: Static VAR compensator (62%), AC power (56%), Power transmission (51%)

86 Citations

Journal ArticleDOI: 10.1109/59.221256
Abstract: An advanced static VAr compensator capable of operating in all four quadrants of the P-Q plane is presented. It is realized by combining a GTO-controlled inverter with a battery energy storage system and a GTO-switched damping resistor. A hierarchically structured control system that fully utilizes the capabilities of the compensator to provide reactive power support in steady-state operation and both real and reactive power modulation in the event of power oscillations is developed. Results from simulation studies are presented to demonstrate the effectiveness of this compensator in improving the loadability of long transmission lines and in providing damping in interarea oscillations. > more

Topics: Static VAR compensator (71%), AC power (57%), Electric power system (55%) more

38 Citations

Journal ArticleDOI: 10.1109/TPAS.1979.319540
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. more

37 Citations