Topic
Power-flow study
About: Power-flow study is a research topic. Over the lifetime, 8091 publications have been published within this topic receiving 155053 citations. The topic is also known as: load-flow study.
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30 Oct 2009TL;DR: It is shown that it is possible to achieve 2D-like or even better power quality by increasing C4 granularity and selecting suitable TSV size and spacing and clear guidelines for 3D power delivery optimization are provided.
Abstract: Three-dimensional integrated circuits (IC) promise high bandwidth, low latency, low device power, and a small form factor. Increased device density and asymmetrical packaging, however, render 3D power delivery design a challenge. In this paper, we provide a system-level comparison of power delivery for 2D and 3D ICs. We investigate various techniques that can impact the quality of power delivery in 3D ICs. These include through-silicon via (TSV) size and spacing, controlled collapse chip connection (C4) spacing, and a combination of dedicated and shared power delivery. Our evaluation system is composed of quad-core chip multiprocessor, memory, and accelerator engine. Each of these modules is running representative SPEC benchmark traces. Our findings are practical and provide clear guidelines for 3D power delivery optimization. More importantly, we show that it is possible to achieve 2D-like or even better power quality by increasing C4 granularity and selecting suitable TSV size and spacing.
56 citations
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TL;DR: In this article, power oscillations have occurred between the interconnected utility systems of Saskatchewan, Manitoba, and Ontario (West System), such power swings have been most evident when the power transmission angles on the interconnections or on certain internal 138kV and 115-kV transmission have been of relatively great magnitude.
Abstract: Intersystem power oscillations have occurred between the interconnected utility systems of Saskatchewan, Manitoba, and Ontario (West System). Such power swings have been most evident when the power transmission angles on the interconnections or on certain internal 138-kV and 115-kV transmission have been of relatively great magnitude. The oscillations have been controlled or reduced by adjustment of the excitation of speed control parameters on various groups of machines throughout the three inter- connected systems. The analytical techniques utilized to determine the adjustments will be of considerable benefit in planning future exrtensions to the interconnections and facilities within the power systems in the three provinces.
56 citations
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TL;DR: In this article, a quadratically constrained quadratic programming (QCQP) model is established to formulate the interval power flow problem and optimality-based bounds tightening (OBBT) method is employed to find a better outer hull of the feasible region.
Abstract: With increasingly large scale of intermittent and non-dispatchable resources being integrated into power systems, the power flow problem presents greater uncertainty. In order to obtain the upper and lower bounds of power flow solutions including voltage magnitudes, voltage angles and line flows, Cartesian coordinates-based power flow is utilized in this paper. A quadratically constrained quadratic programming (QCQP) model is then established to formulate the interval power flow problem. This non-convex QCQP model is relaxed to linear programming problem by introducing convex and concave enclosures of the original feasible region. To improve the solutions bounds while still encompassing the true interval solution, optimality-based bounds tightening (OBBT) method is employed to find a better outer hull of the feasible region. Numerical results on IEEE 9-bus, 30-bus, 57-bus, and 118-bus test systems validate the effectiveness of the proposed method.
56 citations
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TL;DR: A cost-based reactive power pricing is proposed, which can integrate the reactive power cost minimization and the voltage security problem into the optimal power flow (OPF) problem, and the sequential quadratic programming (SQP) is employed to solve the optimization problem.
56 citations
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TL;DR: In this article, a procedure has been developed to determine the maximum simultaneous power interchange capability into a company (area) from its neighboring companies, and the optimal combination of scheduled transfers with the neighbors to provide the maximum import is determined.
Abstract: A procedure has been developed to determine the maximum simultaneous power interchange capability into a company (area) from its neighboring companies. The optimal combination of scheduled transfers with the neighbors to provide the maximum import is determined. The procedure identifies the outages and the facilities which limit the transfers. The new Interchange Capability Program (INCHCAP) developed at Commonwealth Edison Company and the optimizing technique f Linear Programming are used. Both transmission and generation limitations are considered.
56 citations