Journal ArticleDOI
A detailed R-L fed bridge converter model for power flow studies in industrial AC/DC power systems
TLDR
A coal mine power system and a DC electrified transit railway system with regenerative braking function, a part of Taipei Rapid Transit Systems under planning, have been analyzed to show the improved accuracy and good convergence characteristics of the developed Newton-Raphson power flow formulation with the proposed converter model.Abstract:
Because of lower voltage levels and smaller power ratings, the R/X ratio of commutation impedance in industrial AC/DC distribution systems is usually higher than that in HVDC transmission systems. Considerable discrepancies may therefore occur in industrial AC/DC power flow results, especially the reactive power consumption of converters, if the commutation resistances of the converters are neglected. To describe the effects of commutation impedance on converter operations and to precisely relate the fundamental line current and DC output current of the converter, a detailed model of the bridge converter with commutation impedance for use of Newton-Raphson power flow studies in industrial AC/DC power systems is derived in this paper. A coal mine power system and a DC electrified transit railway system with regenerative braking function, a part of Taipei Rapid Transit Systems under planning, have been analyzed to show the improved accuracy and good convergence characteristics of the developed Newton-Raphson power flow formulation with the proposed converter model. >read more
Citations
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Journal ArticleDOI
Optimal underground timetable design based on power flow for maximizing the use of regenerative-braking energy
TL;DR: In this paper, the authors deal with the design of underground rail system timetables that synchronize the movement of trains to allow the energy consumption from substations to be reduced by maximizing the use of regenerative braking energy.
Journal ArticleDOI
A Multi-Option Unified Power Flow Approach for Hybrid AC/DC Grids Incorporating Multi-Terminal VSC-HVDC
TL;DR: In this article, a multi-option power flow approach for hybrid AC/DC grids is proposed, where a unified AC-DC unit is introduced which can be used in two different cases: case a) AC grids with embedded VSC-based MTDC grids, and case b) asynchronous AC grids connected via a common VSC based MTDC grid.
Journal ArticleDOI
Recuperation of Regenerative Braking Energy in Electric Rail Transit Systems
TL;DR: In this article, the various methods and technologies that were proposed for regenerative energy recuperation have been analyzed, investigated, and compared, including train timetable optimization, energy storage systems (onboard and wayside), and reversible substations.
Journal ArticleDOI
A Unified Three-Phase Power-Flow Analysis Model For Electronically Coupled Distributed Energy Resources
M. Z. Kamh,Reza Iravani +1 more
TL;DR: In this article, a unified and generic three-phase, steady-state, fundamental-frequency, sequence-frame-based model of the voltage-sourced converter (VSC) for power-flow analysis of VSC-interfaced Distributed Energy Resource (DER) units is presented.
Dissertation
DC Distributed Power Systems - Analysis, Design and Control for a Renewable Energy System
TL;DR: In this article, the authors proposed a voltage droop control scheme for DC distributed power systems, which does not require any high-speed communication between sources and loads, and is considered the most suitable for DC distribution power systems.
References
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Journal ArticleDOI
A new approach to AC/DC power flow
TL;DR: In this paper, the real and reactive powers consumed by the inverters were treated as voltage dependent loads and the DC equations were solved analytically or numerically, and then the DC variables were eliminated from the power flow equations.
Journal ArticleDOI
Versatile load flow method for multiterminal HVDC systems
John Reeve,G. Fahny,B. Stott +2 more
TL;DR: In this article, a generalized Newton dc load-flow program is presented for multiterminal HVDC systems, which accommodates various configurations of HVdc systems and can interface with any ac load flow program.
Journal ArticleDOI
Inclusion of DC converter and transmission equations directly in a Newton power flow
TL;DR: In this paper, the DC converters and transmission lines are incorporated directly into the Jacobian of the Newton power flow, and the DC equations are presented in a per unit form compatible with the per unit AC equations.
Journal ArticleDOI
A New, Fast Technique for Load-Flow Solution of Integrated Multi-Terminal DC/AC Systems
Magdy El-Marsafawy,R. M. Mathur +1 more
TL;DR: In this paper, the authors describe a new technique for load-flow calculations of integrated ac/dc systems, which is fast, efficient and reliable and is therefore an improvement over known procedures.