Harmonic Analysis of Chopper Controlled Electric Rolling Stock

Chopper controlled electric rolling stock is maintenance free and can reduce power consumption considerably. Comfort and operating performance are both good. Because of these and other features, such rolling stock is now being widely used. However, there are several problems concerning this equipment, for example, harmonic current, its inductive interference, control system, etc. Therefore careful investigations are needed to solve these problems. This paper deals with the harmonic problems which occurs in chopper controlled electric rolling stock in the case of chopper normal or abnormal operation.