Showing papers on "Stand-alone power system published in 1978"

Natural energy conversion, storage and electricity generation system

Abstract: An apparatus and method for utilizing natural energy in the production of electricity having an alternating current is disclosed wherein the natural energy is utilized to pressurize hydraulic fluid. The hydraulic fluid is temporarily stored within high pressure storage tanks to be utilized in the production of electricity. This electricity is supplied as needed to various consumers. Excess electricity which is generated by hydro electric devices driven by the pressurized hydraulic fluid is utilized to pressurize additional hydraulic fluid. The additional hydraulic fluid is then supplied to the high pressure storage tanks to be used at a later time for the production of electricity. In this way, excess electricity that is produced from the pressurized hydraulic fluid is reconverted into pressurized hydraulic fluid which may be stored in the high pressure storage tanks until needed. The high pressure storage tanks may be initially charged with a compressible fluid which is compressed by the pressurized hydraulic fluid. A piston may be provided within each storage tank in order to separate the pressurized hydraulic fluid from the compressible fluid. Depending upon the overall capacity of the natural energy system, a plurality of pressurized storage tanks may be necessary and may be conveniently provided underground.

The power system

Abstract: The paper describes, in detail, the power system forAryabhata. The various elements of the power system-solar array, storage battery and the power conditioners and control units-are covered. The in-orbit performance of the power system is dealt with, highlighting the probable reasons for the failure of one of the bus-lines of the power system.

Advanced Photovoltaic Synchronous-Orbit Spacecraft Power Systems

Abstract: The state-of-the-art of photovoltaic power systems, for use in synchronous-orbit spacecraft, is characterized, including solar array, battery, and power control component performance. Advanced developments in each of these areas are reviewed, and performance improvement projections are made for the 1980-1990 time period. It is estimated that photovoltaic power system specific weight could improve from a present value of 126 kg/kW to approximately 43 kg/kW in 1985. These performance predictions are compared to nuclear system performance projections over the same period. The analysis indicates that advanced photovoltaic power systems will exhibit specific weights lower than isotope and nuclear reactor systems for power levels up to approximately 25 kW. At higher power levels, batteries with higher energy density would be required to compete with the projected performance of advanced nuclear systems. N this paper, we review state-of-the-art performance characteristics of synchronous-orbit power system components, discuss technology advancements, extrapolate overall system performance into the 1980-1990 time period, and finally, make alternative power system comparisons. Power subsystem performance improvement areas include solar array power density, battery energy density, and power control electronics power density. These components typically comprise 15-20% of total spacecraft weight. Increased spacecraft payload weight allocation and total system capability improvement will result from power system weight reduction.

District Heating from Nuclear Power Plants

Abstract: Nuclear power plants are normally designed for operation with condensing turbines for pure electricity production. The rational use of primary energy demands the combined production of electricity ...