Showing papers on "Grid-connected photovoltaic power system published in 1975"

Geosynchronous satellite solar power

Abstract: Since a solar array in space will receive up to 15 times as much solar energy as the same array on the ground, it is advantageous to consider geosynchronous orbital solar power plants. Two designs are considered, with cost estimates and transportation considerations. One is a large photovoltaic solar array and the other is a large solar thermal power plant using paraboloidal concentrators, a Brayton cycle engine and a turbogenerator (the efficiency of this system is calculated at 36 percent, which is considerably higher than that of the solar cell array). The power is transmitted to an earth rectenna station by microwave transmission. Various design, power transmission, transportation, surviving, control, and possible, but unlikely, health hazard details are given. Projected possible power stations and cost schedules are included. (LTN)

The Impact of Direct Coupling of Solar Cell Arrays to Electric Power Networks

Abstract: Results of the investigation of the performance of solar cells when directly coupled to a conventional three-phase power network are presented. This approach dissociates the electricity production problem from the electric energy storage problem. Extensive studies of the required power inverter are performed. Preliminary simulation results indicate that ac power outputs of better than 90 percent of the optimum cell power output can be easily achieved by means of a suitably controlled inverter, thereby justify

Space-based solar power conversion and delivery systems (study), engineering analysis

Abstract: A systems analysis of synchronous, orbit-based power generation and relay systems that could be operational in the 1990's is described along with a comparison with earth-based systems to be operational in the same time frame. Operational and economic requirements for the orbiting systems and near term research activities which will be required to assure feasibility, development, launch and operational capabilities of such systems in the post- 1990 time frame are examined.

Closed Brayton Cycle Turbines for Satellite Solar Power Stations

Abstract: This paper discusses the construction problem of putting together a large power satellite employing turbine power generation. Various levels of technology have been discussed for power satellites; our current baseline is a near-term technology system. In other words, we think we know how to develop all the elements with only modest extensions of today’s state of the art. Our purpose was to analyze the cost and economics of this system, and see how close it comes to being competitive with alternate sources.

Solar house system interfaced with the power utility grid

Abstract: Photovoltaic cells may be used to convert sunlight directly into electrical energy and into low-grade heat to be used for large scale terrestrial solar energy conversion. Both forms of energy can be utilized if such cells are deployed in close proximity to the consumer (rooftop). CdS/Cu2S solar cells are an example of cells which may be produced inexpensively enough to become economically attractive. Cell parameters relevant for combined solar conversion are presented. Critical issues, such as production yield, life expectancy, stability of performance, are discussed. Systems design parameters related to operating temperatures are analyzed. First results obtained on Solar One, the experimental solar house of the University of Delaware, are given. Economic aspects are discussed.

7.5 kW solar array simulator

Abstract: A high power solar array simulator capable of providing the input power to simultaneously operate two 30 cm diameter ion thruster power processors was designed, fabricated, and tested. The maximum power point may be set to between 150 and 7500 watts. This represents an open circuit voltage from 50 to 300 volts and a short circuit current from 4 to 36 amps. Illuminated solar cells are used as the control element. The illuminated solar cells provide a true solar cell characteristic and permit the option of simulating changes in this characteristic due to variations in solar intensity and/or temperature of the solar array. This is accomplished by changing the illumination and/or temperature of the control cells. The response of the output to a step change in load closely approximates that of an actual solar array.