Power quality issues on AC traction systems

It is proposed that power quality in AC railway systems should consider low voltage, high voltage form factor and resonant overvoltage rather than the parameters normally considered for public utilities. Each of the 3 system aspects has a conventional means of compensation and a solution using power electronic systems. The paper describes the potential power quality problem areas on AC traction systems and possible means of compensation. The conclusion is drawn that disturbance levels on AC traction systems are likely to remain higher than disturbance within public electricity supplies to achieve lower capital cost for railway networks.