Showing papers on "Grid-connected photovoltaic power system published in 1985"

The Effect of Photovoltaic Power Generation on Utility Operation

Abstract: This paper presents an evaluation of the effect on utility operation of photovoltaic (PV) generation that is interconnected to an electric utility grid. Various PV concentrations and performance characteristics are examined and the effect on utility generation control performance is evaluated.

Photovoltaic Power System Design for Telecommunications

Abstract: Since its inception in the 1950's photovoltaic (pv) power has been consistently applied in the telecommunications industry first as a convenient power source for satellites and recently for remote terrestrial sites. The size of economically and technically feasible systems has increased from tens of watts in the early 1970's to today's largest commercial telecommunications systems of up to 1 kW continuous power. This paper illustrates specific examples of telecommunication power system design solutions in systems supplied by BP Solar Systems. PV module construction techniques and array design methods are examined with improvements in collected insolation and other environmental data. Battery sizing, charge control, protection and power system interfacing are highlighted, along with aspects of civil/structural design. The paper concludes that reliability will be the most important parameter in further acceptance of photovoltaic power for telecommunications.

Leasecraft Power System Leasecraft Power System

Abstract: Various building blocks of the Fairchild Leasecraft Power System are described in detail after a brief description of the evolution of the Leasecraft spacecraft. The principle of maximum power transfer from a solar cell array has been employed in the power system advantageously. Results of detailed tradeoff studies are presented which led to the selection of the decentralized regulation concept utilizing a nondissipative unregulated main (power) bus approach. Finally the main features of the Leasecraft Power System, i.e., flexibility, reliability, input and output electrical characteristics, etc. are presented.

Dynamic simulation of dispersed, grid-connected photovoltaic power systems: system studies

Abstract: To investigate the operating characteristics and dynamic behavior of photovoltaic (PV) power systems, four PV system configurations were selected as representative of those currently being used in PV applications. These included single and three phase, line and self commutated power conditioners with a flat-plate PV array as the dc source. Detailed computer models of each of these systems were developed and incorporated into dynamic representations of typical primary and secondary distribution feeders. The dynamic electrical behavior of the PV and distribution systems following common network disturbances such as large load changes, PV system startup, and cloud cover transients are characterized. The dynamic behavior was also investigated during abnormal operating conditions following line faults, PV system malfunctions, and islanding of distribution systems containing significant levels of dispersed PV generation. Results of verification tests involving two of the single phase PV system configurations, in which the simulated response characteristics are compared with actual measurements, are also provided.

A photovoltaic power system and a low-power satellite earth station for Indonesia

Abstract: A photovoltaic power system and a low-power, two-way satellite earth station have been installed at Wawotobi, Sulawesi, Indonesia to provide university classroom communications for audio teleconferencing and video graphics. This project is a part of the Agency for International Development's Rural Satellite Program. The purpose of this program is to demonstrate the use of satellite communications for development assistance applications. The purpose of the photovoltaic power system is to demonstrate the suitability of a hybrid photovoltaic/engine-generator power system for a remote satellite earth station. This paper describes the design, installation and initial operation of the photovoltaic power system and the earth station.

Power conditioning subsystems for photovoltaic central-station power plants - Technology and performance

Abstract: Central-Station (CS) Photovoltaic (PV) systems have the potential of economically displacing significant amounts of centrally generated electricity. However, the technical viability and, to some extent, the economic viability of central-station PV generation technology will depend upon the availability of large power conditioners that are efficient, safe, reliable, and economical. This paper is an overview of the technical and cost requirements that must be met to develop economically viable power conditioning subsystems (PCS) for central-station power plants. The paper also examines various already commercially available PCS hardware that may be suitable for use in today's central PV power stations.

Some Consideration about the Practical Design of the Diesel Engine Generator in a Hybrid System as a Power Supply in Telecom Plants

Abstract: In this paper are considered parameters to be taken into account for a first approach design of a group thermal engine Diesel type coupled with an electrical generator Some considerations are made about little electrogenerator groups due to the importance of their utilization in the photovoltaic and aeolian hybrid systems So, tables are tentatively formulated with a practical character for a quick design of the systems All calculations are made in view of a given use of the station battery by the optimization of its work, taking into account all the efficiences involved, in the case of power supply of telecom load operating in cc or ca modes

On the automatic interconnection between solar cells and inverter

Abstract: A novel system including many solar cells and a secondary battery is presented. These energy sources are connected to each other with a bus bar through inverters and supply ac power to loads on the bus bar. The output voltage of the solar cell is always kept constant in order to derive the almost maximum output power from the solar cell when the light strength from the sun is varied. When multiple-loads in different places should be supplied, the solar cells can be distributed near by the respective load in order to remove transmission loss of the bus bar.

Electric power - Photovoltaic or solar dynamic?

Abstract: The design of the power system for supplying the Space Station with insolation-generated electricity is the main Phase B task at NASA-Lewis Center. The advantages and limitations of two types of power systems, the photovoltaic arrays (PV) and the solar dynamic system (SD), are discussed from the points of view of cost, overall systems integration, and growth. Subsystems of each of these options are described, and a sketch of a projected SD system is shown. The PV technology is well developed and proven, but its low efficiency calls for solar arrays of large areas, which affect station dynamics, control, and drag compensation. The SD systems would be less costly to operate than VP, and are more efficient, needing less deployed area. The major drawback of the SD is its infancy. The conservative and forgiving designs for some of its components must still be created and tested, and the development risks assessed.