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Transient (oscillation)

About: Transient (oscillation) is a research topic. Over the lifetime, 32676 publications have been published within this topic receiving 317438 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the impact of increased penetration of photovoltaic (PV) systems on static performance as well as transient stability of a large power system, in particular the transmission system, is examined.
Abstract: Present renewable portfolio standards are changing power systems by replacing conventional generation with alternate energy resources such as photovoltaic (PV) systems. With the increase in penetration of PV resources, power systems are expected to experience a change in dynamic and operational characteristics. This paper studies the impact of increased penetration of PV systems on static performance as well as transient stability of a large power system, in particular the transmission system. Utility scale and residential rooftop PVs are added to the aforementioned system to replace a portion of conventional generation resources. While steady state voltages are observed under various PV penetration levels, the impact of reduced inertia on transient stability performance is also examined. The studied system is a large test system representing a portion of the Western U.S. interconnection. The simulation results obtained effectively identify both detrimental and beneficial impacts of increased PV penetration both for steady state stability and transient stability performance.

687 citations

Book
01 Jan 1971
TL;DR: The Laplace Transform Method of Solving Differential Equations as discussed by the authors has been used to solve differential equations for the calculation of electrical transients in three-phase circuits, and for measuring transients.
Abstract: Fundamental Notions About Electrical Transients. The Laplace Transform Method of Solving Differential Equations. Simple Switching Transients. Damping. Abnormal Switching Transients. Transients in Three-Phase Circuits. Transients in Direct Current Circuits, Conversion Equipment and Static Var Controls. Electromagnetic Phenomena of Importance Under Transient Conditions. Traveling Waves and Other Transients on Transmission Lines. Principles of Transient Modeling of Power Systems and Components. Modeling Power Apparatus and the Behavior of Such Equipment Under Transient Conditions. Computer Aids to the Calculation of Electrical Transients. System and Component Parameter Values for Use in Transient Calculations and Means to Obtain Them in Measurement. Lightning. Insulation Coordination. Protection of Systems and Equipment Against Transient Overvoltages. Case Studies in Electrical Transients. Equipment for Measuring Transients. Measuring Techniques and Surge Testing. Appendices. Index.

687 citations

Journal ArticleDOI
TL;DR: Adapt virtual output impedance is proposed in order to achieve a proper reactive power sharing regardless of the line impedance unbalances and can be properly shared due to the addition of a current harmonic loop in the control strategy.
Abstract: In this paper, a method for the parallel operation of inverters in an ac-distributed system is proposed. This paper explores the control of active and reactive power flow through the analysis of the output impedance of the inverters and its impact on the power sharing. As a result, adaptive virtual output impedance is proposed in order to achieve a proper reactive power sharing, regardless of the line-impedance unbalances. A soft-start operation is also included, avoiding the initial current peak, which results in a seamless hot-swap operation. Active power sharing is achieved by adjusting the frequency in load transient situations only, owing to which the proposed method obtains a constant steady-state frequency and amplitude. As opposed to the conventional droop method, the transient response can be modified by acting on the main control parameters. Linear and nonlinear loads can be properly shared due to the addition of a current harmonic loop in the control strategy. Experimental results are presented from a two-6-kVA parallel-connected inverter system, showing the feasibility of the proposed approach

676 citations

Journal ArticleDOI
TL;DR: The main trends and challenges in circuit reliability are discussed, and evolving techniques for dealing with them are explained.
Abstract: Deep-submicron technology is having a significant impact on permanent, intermittent, and transient classes of faults. This article discusses the main trends and challenges in circuit reliability, and explains evolving techniques for dealing with them.

622 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202259
20211,337
20201,493
20191,759
20181,639
20171,486