Simulation studies on the Northern Line substation renewal project

Power supply equipment on the Edgware and High Barnet branches of London Underground Ltd.´s (LUL) Northern Line is now obsolete and life expired. It was decided to renew the equipment at some locations prior to the proposed Northern Line Modernisation Plan. It is widely recognised that the most effective way of assessing performance of different proposed options for the design of power systems is by means of computer simulation. The authors describe simulation studies undertaken by a London Underground internal design consultancy team to study different proposed options of AC and DC supply arrangements using a well established in-house simulator. The simulator used for this study is based on the Multi-train simulator and is capable of modelling the 22 kV/11 kV distribution network, substation converters, 630 V AC traction supply configuration and voltage sensitive, speed and load dependent train loads. It also takes account of interaction between all these subsystems