Optimizational Mathematical Modeling Methods of DC Traction Power Supply System for Urban Mass Transit

Table 1

The main parameters of Guangzhou Metro Line 4.

Name	Value
Number of pulses	24
Capacity of rectifier unit	2 x 2200 kVA
Ration of rectifier transformer	33 kV/1180 V
Through impedance of rectifier transformer	8%
Half-through impedance of rectifier transformer	6.5%
Rated voltage of DC traction power supply system	1500 V
Length of line	46.3 km
The resistance per unit length of contact line system
Resistance per unit length of rail
Leakage resistance from the rail to the ground	15Ω∙km
Total weight of the train	175t
Maximum running speed of train	90 km/h
Train tracking interval at recent rush hour	450 s