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, an optimized distributed control approach based on DN sensitivity analysis and on decentralized reactive/active power regulation capable of maintaining voltage levels within regulatory limits and to offer ancillary services to the distribution network, such as voltage regulation, is proposed.
Abstract: The increasing penetration of distributed generation (DG) power plants into distribution networks (DNs) causes various issues concerning, e.g., stability, protection equipment, and voltage regulation. Thus, the necessity to develop proper control techniques to allow power delivery to customers in compliance with power quality and reliability standards (PQR) has become a relevant issue in recent years. This paper proposes an optimized distributed control approach based on DN sensitivity analysis and on decentralized reactive/active power regulation capable of maintaining voltage levels within regulatory limits and to offer ancillary services to the DN, such as voltage regulation. At the same time, it tries to minimize DN active power losses and the reactive power exchanged with the DN by the DG units. The validation of the proposed control technique has been conducted through a several number of simulations on a real MV Italian distribution system.
211 citations
TL;DR: In this paper, the authors proposed a method for determining how much of the active and reactive power output of each generator is contributed by each load by using a solved power flow solution.
Abstract: In a competitive environment, usage allocation questions must be answered clearly and unequivocally To help answer such questions, this paper proposes a method for determining how much of the active and reactive power output of each generator is contributed by each load This method takes as its starting point a solved power flow solution All power injections are translated into real and imaginary currents to avoid the problems arising from the nonlinear coupling between active and reactive power flows caused by losses The method then traces these currents to determine how much current each source supplies to each sink These current contributions can then be translated into contributions to the active and reactive power output of the generators It is also shown that the global contribution of a load can be decomposed into contributions from its active and reactive parts This decomposition is reasonably accurate for the reactive power generation To determine the contributions to active power generation, the previously-described method based on the active power flows is recommended
209 citations
TL;DR: In this article, the authors considered a weekly self-scheduling of a virtual power plant composed of intermittent renewable sources, storage system and a conventional power plant, and formulated the optimal dispatch problem as a mixed-integer linear programming model which maximizes the weekly virtual power plants profit subject to the long-term bilateral contracts and technical constraints.
208 citations
Book•
01 Aug 1991
TL;DR: DC Power Transmission Technology Thyristor Valve Analysis of HVDC Converters Converter andHVDC System Control Converter Faults and Protection Smoothing Reactor and DC Line Reactive Power Control Harmonics and Filters Multiterminal DC Systems Component Models for the Analysis of AC/DC Systems Power Flow Analysis.
Abstract: DC Power Transmission Technology Thyristor Valve Analysis of HVDC Converters Converter and HVDC System Control Converter Faults and Protection Smoothing Reactor and DC Line Reactive Power Control Harmonics and Filters Multiterminal DC Systems Component Models for the Analysis of AC/DC Systems Power Flow Analysis in AC/DC Systems Transient Stability Analysis Dynamic Stability and Power Modulation Harmonic and Torsional Interactions Simulation of HVDC Systems Digital Dynamic Simulation of Converters and DC Systems Appendix Index.
207 citations
TL;DR: In this article, the authors compared the validity of a typical DC power flow-based CFS in cascading failure analysis with a new numerical metric defined as the critical moment (CM).
Abstract: When the modern electrical infrastructure is undergoing a migration to the Smart Grid, vulnerability and security concerns have also been raised regarding the cascading failure threats in this interconnected transmission system with complex communication and control challenge. The DC power flow-based model has been a popular model to study the cascading failure problem due to its efficiency, simplicity and scalability in simulations of such failures. However, due to the complex nature of the power system and cascading failures, the underlying assumptions in DC power flow-based cascading failure simulators (CFS) may fail to hold during the development of cascading failures. This paper compares the validity of a typical DC power flow-based CFS in cascading failure analysis with a new numerical metric defined as the critical moment (CM). The adopted CFS is first implemented to simulate system behavior after initial contingencies and to evaluate the utility of DC-CFS in cascading failure analysis. Then the DC-CFS is compared against another classic, more precise power system stability methodology, i.e., the transient stability analysis (TSA). The CM is introduced with a case study to assess the utilization of these two models for cascading failure analysis. Comparative simulations on the IEEE 39-bus and 68-bus benchmark reveal important consistency and discrepancy between these two approaches. Some suggestions are provided for using these two models in the power grid cascading failure analysis.
205 citations