ANALYSIS OF POWER QUALITY PROBLEMS AND SUBSYNCHRONOUS RESONANCE IN 25 KV AC TRACTION POWER SUPPLY SYSTEM IN DELHI METRO RAIL NETWORK LINE-2 AND PROPOSED IMPROVEMENTS USING SATATCOM-DYNAMIC REACTIVE POWER COMPENSATORS

Abstract

Delhi Metro Railway Corporation is providing metro services over a network of more than 213 route km. with 160 stations, which also include 54 route km under-ground portions. DMRC runs almost 216 rakes consisting of 4/6/8 coaches for transporting about 2.8 million passengers everyday with peak headway of 138 sec. Punctuality on Delhi Metro is measured with a least count of 60 sec and on most days, it has been achieving 100% punctuality making it one of the most punctual metros in the world. Delhi Metro Rail Corporation Limited has adopted 25 KV AC Traction Power supply network for Trains and 33 kV AC distribution network for supplying the auxiliary load requirements at various stations where the voltage is step down to 415 V for feeding the auxiliary equipments. This system is typical than the utility distribution network as redundancies have to be catered for making the supply reliable. The popularity of DMRC can be gauged as even occasional disruption to train operation, due to any failure in equipments causes inconvenience to passengers and invites severe criticism from public and media.