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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TL;DR: In this article, a decentralized approach based on a modified generalized Benders decomposition in which locally optimal cost function of each area is introduced is introduced. But it is suitable for multi-area interconnected systems with a hierarchical control architecture.
Abstract: Fluctuations in wind power in geographically distributed areas are typically complementary, and therefore a coordinated multi-area dynamic economic dispatch may enable greater wind power penetration in interconnected power systems. Here we describe a decentralized approach based on a modified generalized Benders decomposition in which locally optimal cost function of each area is introduced. The technique exhibits rapid convergence and does not require parameter tuning. It is suitable for multi-area interconnected systems with a hierarchical control architecture. Comparative numerical simulations demonstrate that the performance of our method is favorable in terms of accuracy, convergence and computational efficiency. A case study on a real power system is also carried out to demonstrate the potential of this technique to increase wind power penetration.
121 citations
Book•
01 Jan 1979
TL;DR: In this paper, the authors present a power system representation of the power flow problem and present a fault analysis method for the power system with respect to balanced and unbalanced faults, as well as dynamic performance of power systems.
Abstract: Sinusoidal Steady State Circuit Concepts. Power System Representation. Transmission Lines. The Power Transformer. The Synchronous Machines. The Power Flow Problem. Operation and Control of Power Systems. Balanced and Unbalanced Faults. Fault Analysis by Computer Methods. Power System Protection. Power System Dynamic Performance. Appendices. Index.
120 citations
TL;DR: In this article, a new method for the allocation of new generation capacity, which takes into account fault level constraints imposed by protection equipment such as switchgear, is presented, which simulates new generation capacities and connections to other networks using generators with quadratic cost functions.
Abstract: The aim of this paper is to present a new method for the allocation of new generation capacity, which takes into account fault level constraints imposed by protection equipment such as switchgear. It simulates new generation capacities and connections to other networks using generators with quadratic cost functions. The coefficients of the cost functions express allocation preferences over connection points. The relation between capacity and subtransient reactance of generators is used during the estimation of fault currents. An iterative process allocates new capacity using optimal power flow mechanisms and readjusts capacity to bring fault currents within the specifications of switchgear. The method was tested on a 12-bus LV meshed network with three connection points for new capacity and one connection to an HV network. It resulted in significantly higher new generation capacity than existing first-come-first-served policies.
120 citations
TL;DR: In this article, the authors proposed a new hybrid distributed networked-based power control scheme that addresses the frequency deviations, power-sharing errors, and stability concerns associated with conventional droop control in micro-grids.
Abstract: Distributed generation (DG) microgrid systems are forming the building blocks for smart distribution grids. Enhanced networked-based control structure is needed not only to eliminate the frequency deviations, power-sharing errors, and stability concerns associated with conventional droop control in microgrids but also to yield: 1) improved microgrid dynamic performance, 2) minimized active/reactive power-sharing errors under unknown line impedances, and 3) high reliability and robustness against network failures or communication delays. This paper proposes a new hybrid distributed networked-based power control scheme that addresses the aforementioned problems in a distributed manner. The new method consists of a set of distributed power regulators that are located at each DG unit to ensure perfect tracking of the optimized set points assigned by the centralized energy management unit (EMU). The average power measurements are transmitted to the EMU to calculate the share of each unit of the total power demand based on real-time optimization criteria; therefore, a low-bandwidth communication system can be used. In the proposed method, the distributed nature of the power regulators allows them to adopt the delay-free local power measurements as the required feedback signals. Therefore, the proposed structure provides great robustness against communication delays. Further, this paper presents a generalized and computationally efficient modeling approach that captures the dominant dynamics of a microgrid system. The model can be used to study the impact of power-sharing controllers and delays in microgrid stability. Comparative simulation and experimental results are presented to show the validity and effectiveness of the proposed controller.
120 citations