A review of power quality issues in electrified rails
Journal Title: Електромагнітна сумісність та безпека на залізничному транспорті - Year 2017, Vol 1, Issue 14
Abstract
Electrified railways are among of the largest consumers of electric energy with longitudinally distributed power supply stations and connected to lines fixed (unmovable) electrical loads (con-sumers) and moving loads (vehicles), which operate, in general case, in nonlinear pulse modes.. Due to the electrical non-linear nature of power stations and loads, current and voltage distor-tions appear in railway lines that devastating impact on the entire power system and consumers. The development of high-speed railways and the use of new types of rolling stock with power electrical equipment and pulse-width modulation of the traction current lead to problems with electromagnetic compatibility (EMC) and power quality in feeding grids that can adversely in-fluence on train movement safety. The purpose of this article is to give a brief overview of power quality issues in electrified railways and also to consider related PQ standards. The main power quality disturbances are il-lustrated by using fragments of the traction current and voltage time-dependences measured dur-ing tests of the rolling stocks on electromagnetic compatibility with rail circuits. The traction current and voltage were registered in vehicle power equipment circuits, using a current and voltage probes whose signals were converted by analog-to-digital converter and re-corded by PC. The different definitions of power quality presented in standards and literature are discussed. The main power quality disturbances were illustrated using specially chosen characteristic fragments of registered traction current, and some their parameters and electrical processes caused them are considered.
Authors and Affiliations
V. Havriliuk
Keywords
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