Transcript ISSUE OF CONCERN

ISSUE OF CONCERN
HIGH VOLTAGES IN VEMAGIRI 400 KV
• VOLTAGES AT VEMAGIRI COMPLEX
(GAS GENERATORS) ARE EXTREMELY
HIGH
• GENERTOR TAPS ARE SUB-OPTIMAL
– TAP CHANGE MESSAGE IS ISSUED BY
SRLDC
– DISCUSSED IN OCC – JAN 2010 ALS
• IPP’S TO FULLY CO-OPERATE FOR
BETTER VOLTAGE CONTROL AT
VEMAGIRI
CONDENSOR MODE OPERATION IN AP
• CONDENSOR MODE OPERATION IS A VALUABLE
RESOURCE FOR SYSTEM OPERATORS
– INCREASED SHORT CIRCUIT LEVEL- VOLTAGE
EXCURSIONS LIMITED
– QUICK CONVERSION TO GENERATOR MODE DURING
CONTINGENCY
– PREVENTS OPENING OF TRUNK LINES ON OVER VOLTAGE
– HEATING AND WINDAGE-FRICTION LOSSES ARE THE
ISSUES
• GENERATORS CAPABLE OF RUNNING IN THIS
MODE IN AP
– SRISAILAM LEFT BANK (CAPABLE OF 4 QUADRANT)
• SRISAILAM AREA PRONE TO HIGH VOLTAGES,
• SSLM-NUNNA BOTH CIRCUITS ARE OPENED OUT – IMPACT
ON RELIABILITY
– N’SAGAR
• WOULD HELP CONTROL VOLTAGES AT N’SAGAR AND GOOTY
AREAS
RING MAIN FOR HYDERABAD
DEFENCE PLAN FOR LARGE
METROPOLITAN AREAS
• VLPGO DELIBERATED ON THE ISSUE
OF ‘PREVENTION OF BLACKOUTS ON
SUPER-LARGE METROPOLITAN CITIES’
• EVERY MAJOR CITY MUST HAVE A
DEFENCE PLAN
• INDIA HAS FOCUSSED ON ROBUST
RING MAINS FOR RELIABILITY
CENTRAL TOKYO GRID
THIS PART OF
RING ALSO NEEDS
STRENGTHENING
OPTION:
CONNECT E-CITY TO HOSUR
400 KV. ADVANTAGE OF
SEPARATE SOURCE FOR
BANGALORE (FROM TN) AND
SHORT PATH.
ROW OF EXISTING 220 KV
YERRANDAHALLI-HOSUR CAN
BE USED)
LILO OF YELAHANKASOMANAHALLI AT
NELAMANGALA
WEAK LINK IN
RING MAIN
CAN BE MADE
D/C ONE
SECTION AT A
TIME USING
SAME ROW
TO HOSUR
USING ROW OF 22
KV
YERRANDAHALLIHOSUR
CHENNAI AREA PROPOSED
THIRUVELAM
CHENNAI RING MAY BE
MODIFIED SLIGHTLY DUE
TO BAY AVAILABILITY
CONSTRAINTS
RING MAIN FOR HYDERABADSECUNDERABAD METRO AREA
GAJWEL
MALKARAM
FROM RAMAGUNDAM
GENERATING
STATION
• RING MAIN TO BE EXPEDITED
• SEPARATE INFEEDS FOR
GAJWEL, Y’MAILARAM AND
MALKARAM TO BE THOUGHT
OF
• ISLANDING SCHEME FOR
HYDERABAD TWIN CITY WITH
RAMAGUNDAM IS IN
ADVANCED STAGE
YEDDUMAILAR
AM
GHANAPUR
MAMIDAPALLI
EXISTING
EXISTING
NETWORK ISSUES
• NUNNA-NELLORE 400 KV D/C LINE
– 345 KMS LONG, REACTORS AT BOTH ENDS
– WITH VEMAGIRI GENERATION COMING UP,
NUNNA-NELLORE IS FULLY LOADED
– LIMITING LINE LENGTH WOULD IMPROVE ITS
LOADABILITY
– LILO OF THIS LINE AT SUITABLE PLACE WOULD
HELP
• SRISAILAM-KURNOOL-GOOTY
EXPERIENCES HEAVY LOADING WITH FULL
GENERATION AT SRISAILAM
FGMO TRIAL OPERATION