To safeguard Delhi and its surrounding areas from electricity supply disruption during grid failure, Mr Sh Veerappa Moily minister for Power and Ms Sheila Dixit CM of Delhi announced the Islanding Scheme for Delhi.
At the joint press conference, Mr Moily said that Delhi is the first state to formulate such a scheme to overcome grid disturbance problem. The main objective of the initiative is to isolate our generating stations so that supply of power does not get affected even if the Northern grid collapses.
The proposed Islanding Scheme for Delhi has been developed with following objectives in mind:
I. To isolate Delhi’s power system from the regional grid when grid disturbance is imminent
II. After isolation to continue to meet at least emergency loads or essential services like VVIP load, Delhi Metro Rail, Water treatment load, Indian Railways load and hospitals. The present quantum of essential load spread across various distribution companies of Delhi is about 930 MW.
III. To extend start up supply to generating stations in adjoining areas to facilitate early restoration.
The Islanding Scheme envisages that fall of frequency to 47.9 HZ will be taken as indication that grid disturbance is imminent and islanding will be initiated. Ideally one island is preferred but due to peculiar network considerations of Delhi and limitation imposed by Rithala CCGT, there is no option but to create four islands, capable of meeting about 3400 MW of load during peak conditions, as listed below:
(i) Dadri - Jajjhar-Pragati (part) Island (Peak load 2315 MW)
(ii) Bawana CCGT Island (Peak load 600 MW)
(iii) BTPS-Pragati (part) Island (Peak load 500 MW)
(iv) Rithala CCGT Island (Peak load 20 MW)
Keeping in view the complexity of the Delhi Power network, creation and survival of the Islands, some additional features like development of intelligent system for centralized decision making, augmentation of generation within Delhi, maintaining dual source of supply to essential loads, training of system operators, etc. are proposed to be taken up under this scheme.
The scheme which is expected to cost almost INR 25 Crore will be operational from January 2013. Initially, Delhi’s critical requirement of 930 MW will be Islanded.
Further, the Islanding will then be extended to 3400 MW. The other states who have approached the Ministry of Power for similar arrangement are Punjab, Haryana, Utter Pradesh and Jammu & Kashmir.
Source - PIB
(www.steelguru.com)
