Showing papers on "Stand-alone power system published in 1984"

Wind and Solar-Powered Hybrid Prime Power Systems

Abstract: During the past five years, there has been rapid development in the field of wind and solar-powered hybrid prime power systems. This paper will discuss the following three aspects of this development: A review of accepted techniques for designing and installing a hybrid alternative energy system and also the possible pitfalls one might encounter. System controllers. System controllers play a dynamic role in the reliability of hybrid prime power systems. New developments in these controllers will be discussed, focusing on both accuracy and heightened reliability, including a discussion on the latest methods of amp-hour accumulation and subsequent signalling of control circuits and telemetry outputs. System sizing. System sizing plays an important role in the effectiveness and economics of a hybrid prime power system. A discussion of both the worst-case scenario as well as life cycle costing techniques will be presented. A step by step example will illustrate present techniques for optimization of wind and photovoltaic resources and battery capacity.

A Distributed Power Architecture for the System 75 Digital Communications System

Abstract: The distributed power architecture for the System 75 Digital Communications System offers performance that would be difficult to achieve with conventional power architectures. With distributed power, each circuit-card shelf is powered by its own off-line switcher (OLS) power units. This limits the effects of a power-unit failure and contributes to increased system reliability. An optional battery reserve system ensures uninterrupted power without an external uninterruptible power system. The result is that System 75 is a low-cost, easy-to-repair digital communications system.

Electrical power systems for Space Station

Abstract: Major challenges in power system development are described. Evolutionary growth, operational lifetime, and other design requirements are discussed. A pictorial view of weight-optimized power system applications shows which systems are best for missions of various lengths and required power level. Following definition of the major elements of the electrical power system, an overview of element options and a brief technology assessment are presented. Selected trade-study results show end-to-end system efficiencies, required photovoltaic power capability as a function of energy storage system efficiency, and comparisons with other systems such as a solar dynamic power system.

Wind-powered Electricity Generation on Lundy Island

Abstract: Lundy Island, in the approaches to the Bristol Channel, provides a good example of electricity supply to an isolated community. In November 1982 a 55 kW Windmatic wind turbine was installed on the island with the purpose of reducing dependence on expensive diesel generation. The wind system has been operating more or less continuously since then, providing most of the island's energy requirement. Operation of the system has brought benefits to the island community over and above savings in diesel fuel. These include extended periods of electricity supply, increased thermal comfort and a reduction in building maintenance costs.

Power generation using fuel cells

Abstract: Fuel cell technology, developed for spacecraft onboard power supplies, can be scaled up and adapted for use in the electricity and gas supply industries. The authors describe research in the USA and Japan which is producing small, local power generators with high overall efficiency and good heat recovery

Triple hybrid primary power supply system

Abstract: Various proposals have been made in recent years with regard to hybrid power supply systems for communication system applications. the main common feature of such systems is the incorporation of two or more kinds of power sources. In this paper we first discuss the concept of hybrid systems and then describe experimental results obtained with a triple hybrid system incorporating a wind-power generator, solar cells and Diesel generating equipment. It is then shown that the continuous time distribution of natural energy in the nonenergized state follows an exponential function. We apply a mathematical model which is in good agreement with the experimental results and develop a theory for derivation of the required storage battery capacity as well as the power to be applied by the Diesel generators. Then, applying this design method to various systems, we present a quantitative analysis of the complementary relationship between wind power and solar illumination and show that the triple hybrid system is most economical.

System Design for Stand-By Power Supply

Abstract: Telecommunications is playing an increasing important role as part of the infrastructure for sociel life Therefore, when telecommunications service is interrupted, it causes serious disruption of social activities Power systems are important for telecommunications service because they provide the lifeblood of the telecommunications network Stand-by power, which is part of the telecommunications power system, backs up commercial power sources and improves the reliability of the power supply system This paper discusses the concept of stand-by power supply, range of engine-generator applications, battery holding-time and the stationing standard for mobile and transportable generators This paper also introduces stand-by power system for a digital network