Yang Shaobing

The application of SVC for the power quality control of electric railways

Electric railways are pollution sources of power quality in the public power system. The low power factor and current harmonics caused by AC-DC locomotives have been difficult problems needed to be deal with for a long time in China. Some countermeasures have been taken by the railway authorities to improve the power qualities in recent years. This paper presents the performance of the SVC, which is a combination of passive filters and thyristor controlled reactor, based on the measured data of power qualities of An-ding traction substation of Beijing-Shanghai electrified railway. The different operational manners of the compensator are compared with the measured data of three-phase unbalance and total harmonic distortion. The SVC technique has shown a promising solution to the improvement of power quality of electric railways. The compensator topology and relevant parameters should be given enough attention in engineering application to obtain an optimal effect.

High speed EMU modeling based on the measured data

Based on a large amount of actual measured data on railway line, this paper presents a modeling method using curve-fitting and probabilistic density functions for a high speed EMU. This method better simulates the real world and can be used to build a rapid data exchange between the trains and the traction power system simulation.

Performance of the integrated grounding system of hefei-nanjing passenger dedicated railway

In order to ensure the human and equipment safety, the concept and the technique of the integrated grounding system has been introduced in high speed railway engineering in China. High running speed and dispatching density lead to large traction load currents in the power supply systems. Moreover, the high speed railway widely adopt non-ballasted track, which has a relative high rail leakage resistance to the ground. This can result in very high electric potential of the rail. The integrated grounding system uses two buried bare copper wires to connect together various grounding structures along the railway properly to guarantee equipotential states of different systems and equipments. Based on the immense measured data in the field of Hefei-Nanjing passenger dedicated line, the performance of the integrated grounding system is analyzed in this paper. Some further suggestions are also put forward to improve the electric characteristics of the integrated grounding systems used in railway design.