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.
Papers published on a yearly basis
Papers
More filters
•
IBM1
TL;DR: In this article, a power management system and method for multiple redundant power supplies is presented, where each power subsystem includes a power supply and a controller coupled to a power bus, and a master controller is provided to monitor normal operating conditions of the power subsystems and communication bus, even in the event of total or partial communication failure.
Abstract: A power management system and method for multiple redundant power supplies. The present invention provides management and control of N+M power supplies, where N represents the minimum number of power supplies required and where M is the number of redundant power supplies (M>1), where any one of the power supplies may be capable of supplying power to all the loads of the power subsystems. In the preferred embodiment each power subsystem includes a power supply and a controller coupled to a power bus. A communication bus is provided common to each power subsystem. During reset or power-on periods, the controllers are programmed to uniquely delay the start time of each power supply, thereby protecting against an overcurrent/overvoltage condition on the power bus during reset periods. A master controller is provided to monitor normal operating conditions of the power subsystems and communication bus. The master controller is programmed to ensure that a predetermined number of power supplies are coupled to the power bus, even in the event of total or partial communication failure.
65 citations
••
TL;DR: The proposed electrical system will provide a base case for other studies such as: reactive power compensation, stability and inertia analysis, reliability, demand response studies, hierarchical control, fault tolerant control, optimization and energy storage strategies.
65 citations
••
07 Aug 2002
TL;DR: In this article, a railway static power conditioner (RPC) is proposed to balance the effective power of different phases and compensate reactive power and harmonics in high-speed AC electric railways.
Abstract: High-speed AC electric railways, such as Shinkansen, require large single-phase AC electric power. So, if the short circuit capacity of the power system is not large enough, therefore, railway operation causes large voltage unbalance at the three-phase side. In this paper, a railway static power conditioner (RPC), a new system for reducing voltage unbalance and fluctuation, is described. To reduce voltage unbalance and fluctuation, the RPC balances effective power of different phase and compensates reactive power and harmonics. It enables operation of high-speed AC electrified railways even if the short circuit capacity of the power system is rather small.
65 citations
••
TL;DR: In this article, spectral analysis of system response to random load changes has become a standard engineering tool at the Bonneville Power Administration and has been used to estimate the required size for a superconducting electromagnetic storage device which will provide backup to HVDC Modulation.
Abstract: In recent years spectral analysis of system response to random load changes has become a standard engineering tool at the Bonneville Power Administration. Analysis of random fluctuations in power on the Pacific AC Intertie has provided information about the influence of system operating conditions upon the effectiveness of Pacific HVDC Intertie modulation, and about dynamic behavior of the western power system generally. This technique has also been used to estimate the required size for a superconducting electromagnetic storage device which will provide backup to HVDC Modulation, and has detected a major system mode 6 months before it was first observed in a transient disturbance
65 citations
••
01 Nov 1967TL;DR: In this paper, an economic schedule for real power generation is obtained by a Lagrangian method and the allocation of reactive power generation are determined by a gradient method until the total cost is minimized within the limitations imposed by system constraints.
Abstract: An economic schedule for real power generation is obtained by a Lagrangian method and the allocation of reactive power generation is determined by a gradient method. Alternate real and reactive power requirements for economic system operation are computed until the total cost is minimized within the limitations imposed by system constraints. Repeated solutions of the network equations are used to incorporate the effects of transmission losses in lieu of a precalculated transmission loss formula. The computer program provides a means to determine the optimum use of available real and reactive power generation and to plan economically for future requirements.
64 citations