scholarly journals Effect of Voltage Level on Power System Design for Solar Electric Propulsion Missions

Solar Energy ◽  
2003 ◽  
Author(s):  
Thomas W. Kerslake
Keyword(s):  
Power System ◽  
Attitude Control ◽  
Electric Propulsion ◽  
Computational Models ◽  
Electric Power System ◽  
Proton Radiation ◽  
Direct Drive ◽  
Photovoltaic Array ◽  
Solar Electric Propulsion ◽  
Study Results

This paper presents study results quantifying the benefits of higher voltage, electric power system designs for a typical solar electric propulsion spacecraft Earth orbiting mission. A conceptual power system architecture was defined and design points were generated for system voltages of 28-V, 50-V, 120-V and 300-V using state-of-the-art or advanced technologies. A 300-V “direct-drive” architecture was also analyzed to assess the benefits of directly powering the electric thruster from the photovoltaic array without up-conversion. Fortran and spreadsheet computational models were exercised to predict the performance and size power system components to meet spacecraft mission requirements. Pertinent space environments, such as electron and proton radiation, were calculated along the spiral trajectory. In addition, a simplified electron current collection model was developed to estimate photovoltaic array losses for the orbital plasma environment and that created by the thruster plume. The secondary benefits of power system mass savings for spacecraft propulsion and attitude control systems were also quantified. Results indicate that considerable spacecraft wet mass savings were achieved by the 300-V and 300-V direct-drive architectures.

scholarly journals Effect of Voltage Level on Power System Design for Solar Electric Propulsion Missions

2004 ◽  
Vol 126 (3) ◽  
pp. 936-944 ◽  
Author(s):  
Thomas W. Kerslake
Keyword(s):  
Power System ◽  
Attitude Control ◽  
Electric Propulsion ◽  
Computational Models ◽  
Electric Power System ◽  
Direct Drive ◽  
Photovoltaic Array ◽  
Solar Electric Propulsion ◽  
Study Results ◽  
Space Environments

This paper presents study results quantifying the benefits of higher voltage, electric power system designs for a typical solar electric propulsion spacecraft Earth orbiting mission. A conceptual power system architecture was defined and design points were generated for several system voltages using state-of-the-art or advanced technologies. A 300-V “direct-drive” architecture was also analyzed to assess the benefits of directly powering the electric thruster from the photovoltaic array without up-conversion. Computational models were exercised to predict the performance and size power system components to meet spacecraft mission requirements. Pertinent space environments were calculated for the mission trajectory and an electron current collection model was developed to estimate photovoltaic array losses due to natural and induced plasma environments. The secondary benefits of power system mass savings for spacecraft propulsion and attitude control systems were also quantified. Results indicate that considerable spacecraft wet mass savings were achieved by the 300-V and 300-V direct-drive architectures.

scholarly journals Application of Mineral Compounds for a High-Voltage Portable Grounding System: An Experimental Study

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 2043
Author(s):  
Rizwan Ahmad ◽  
Mahmoud Kassas ◽  
Chokri B. Ahmed ◽  
Faisal Khan ◽  
Sikandar Khan ◽  
...  
Keyword(s):  
Power System ◽  
Research Work ◽  
Xrd Analysis ◽  
Electric Power System ◽  
Operating Conditions ◽  
Element Analysis ◽  
Lightning Strikes ◽  
Grounding System ◽  
Ground Resistance ◽  
Study Results

Electrical grounding is an indispensable part of the power system network. The grounding system is mainly affected by grounding resistance and the nature of the soil. High ground resistance produces the phenomenon of soil ionization, surface arching, and back flashover. A conventional grounding system requires the deep digging of electrodes, thus creating maintenance difficulties. This research work focuses on the safe operation of an electric power system from external and internal impulses arising due to lightning strikes or short circuits. The study proposes an application of mineral samples as grounding materials, and bentonite is used as backfilling material in portable grounding systems. A detailed experimental analysis was conducted under controlled conditions to evaluate the performance of selected materials in high-resistance soil. The problem of a deeply driven electrode is addressed by designing the portable grounding system. The study results demonstrate that the proposed portable grounding system could be installed in troubled environments such as forests, deserts, and rocky terrains. To measure the breakdown voltages of the proposed samples, X-ray Diffraction (XRD) analysis and other laboratory tests were conducted. The electric field intensities are extracted through Finite Element Analysis (FEA). The experimental and simulation findings show the expected performance of mineral samples under various operating conditions. The findings of this study can guide the practitioners for safe and efficient operations of portable electrical grounding systems.

scholarly journals High-voltage array ground test for direct-drive solar electric propulsion

2006 ◽  
Vol 59 (1-5) ◽  
pp. 206-215 ◽  
Author(s):  
Joe T. Howell ◽  
Mark J. O’Neill ◽  
John C. Mankins
Keyword(s):  
High Voltage ◽  
Electric Propulsion ◽  
Direct Drive ◽  
Solar Electric Propulsion ◽  
Ground Test

Optimal Design of MPPT Controllers for Grid Connected Photovoltaic Array System

2016 ◽  
Vol 17 (5) ◽  
pp. 511-517 ◽  
Author(s):  
M. A. Ebrahim ◽  
H. A. AbdelHadi ◽  
H. M. Mahmoud ◽  
E. M. Saied ◽  
M. M. Salama
Keyword(s):  
Optimal Design ◽  
Power System ◽  
Short Circuit ◽  
Dynamic Performance ◽  
Research Work ◽  
Open Circuit ◽  
Electric Power System ◽  
Maximum Power ◽  
System Dynamic ◽  
Photovoltaic Array

Abstract Integrating photovoltaic (PV) plants into electric power system exhibits challenges to power system dynamic performance. These challenges stem primarily from the natural characteristics of PV plants, which differ in some respects from the conventional plants. The most significant challenge is how to extract and regulate the maximum power from the sun. This paper presents the optimal design for the most commonly used Maximum Power Point Tracking (MPPT) techniques based on Proportional Integral tuned by Particle Swarm Optimization (PI-PSO). These suggested techniques are, (1) the incremental conductance, (2) perturb and observe, (3) fractional short circuit current and (4) fractional open circuit voltage techniques. This research work provides a comprehensive comparative study with the energy availability ratio from photovoltaic panels. The simulation results proved that the proposed controllers have an impressive tracking response. The system dynamic performance improved greatly using the proposed controllers.

Electric power system development - A companion technology to electric propulsion

1997 ◽  
Author(s):  
Gary Bennett ◽  
Henry Brandhorst, Jr. ◽  
C. Bankston ◽  
R. Sovie ◽  
Gary Bennett ◽  
...  
Keyword(s):  
Power System ◽  
Electric Power ◽  
Electric Propulsion ◽  
System Development ◽  
Electric Power System

scholarly journals Research of current distribution by phases in asynchronous electric motor with a combined winding

2022 ◽  
Vol 23 (5) ◽  
pp. 172-183
Author(s):  
A. E. Savenko ◽  
P. S. Savenko
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electric Power ◽  
Electric Propulsion ◽  
Experimental Studies ◽  
Negative Influence ◽  
Electric Power System ◽  
The Arctic ◽  
Diesel Generator ◽  
Power Oscillations

THE PURPOSE. Consider the use of propeller electric installations as part of ship electrical complexes with a single electric power system. Highlight the rudder drives as a special type of electric propulsion of ships in northern latitudes. Investigate unified electric power systems with a propeller electric installation for the existence of power exchange oscillations in them. Propose methods and means for eliminating power oscillations in such systems.METHODS. To carry out the research, a single electric power system with electric rudder propellers of the world's only asymmetric icebreaker Baltika was considered. All the main elements of such system have been analyzed in detail. Experimental studies were carried out aimed at studying the operating modes of a unified electric power system.RESULTS. Experimental oscillograms of currents of parallel operating diesel-generator sets in different modes have been obtained. The existence of exchange and in-phase power oscillations during the operation of the unified electric power system of the icebreaker "Baltika" is noted. The data on the negative influence of power oscillations on the operation of the electrical complex of the icebreaker are presented.CONCLUSION. The use of ice-class sea vessels is an extremely important task for the Russian Federation. The installation of blocks that eliminate exchange and in-phase power oscillations will improve the reliability and efficiency of the use of marine vessels with electric rudder propellers when servicing hydrocarbon production on the Arctic shelf.

Sign in / Sign up

Export Citation Format

Share Document