Transcript SPS for Congestion Management: Between S1,S2 Bid Area

SPECIAL PROTECTION
SCHEMES
S.P.KUMAR
CM(SRC&S)
SRLDC, BANGALORE
SPECIAL PROTECTION SCHEMES
DEFINITION
PROTECTION SCHEME DESIGNED
TO
DETECT ABNORMAL SYSTEM CONDITIONS
AND TAKE
PREDETERMINED CORRECTIVE ACTION
(Other than isolation of faulty element)
TO
PRESERVE SYSTEM INTEGRITY AND PROVIDE
ACCEPTABLE SYSTEM PERFORMANCE
WHAT IS SPS?
According to P.M.Anderson SPS is defined as “ a
protection scheme that is designed to detect a
particular system condition that is known to cause
unusual stress to the power system and to take
some type of predetermined action to counteract
the observed condition in a controlled manner. In
some cases, SPSs are designed to detect a system
condition that is known to cause instability, overload,
or voltage collapse. The action prescribed may
require the opening of one or more lines, tripping of
generators, ramping of HVDC power transfers,
intentional shedding of load, or other measures that
will alleviate the problem of concern.”
Security Monitoring
Normal
Restoration
SECURITY WEAKENED.
INCLEMENT WEATHER.
Preventive
Control
Restorative
ALL CONSTRAINTS ARE MET.
Alert
Emergency
Control
In extremis
CASCADING OUTAGES,
ISLANDING, MAJOR PARTS
OF GRID ARE BLACKED OUT
Emergency
SECURITY MONITORING TOOLS
KICK IN. RRPA IS SUGGESTED
TO BRING SYSTEM BACK TO
NORMAL..LIKE GENERATION
SHIFTING ETC
RELIABILITY CRITERIA NOT
MET. VOLTAGE AT BUSES MAY
BE UNACCEPTABLY LOW.
ELEMENT LOADING MAY
EXCEED LIMITS.
EMERGENCY CONTROL
ACTIONS- FAULT CLEARING,
EXCITATION CONTROL, LOAD
SHED, GENERATION
RUNBACK, HVDC MODULATION
STABILITY
• ‘Power system stability is the ability of an
electric power system, for a given initial
operating condition, to regain a state of
operating equilibrium after being subjected
to a physical disturbance, with most
system variables bounded so that
practically the entire system remains
intact.’
Source:-P.M.Andersen
STABILITY IN POWER SYSTEMS
Cascading Blackouts
FAST ACTING: WAMS
BASED SPS
Power System
Thermal
Stability
Overloading
GENERATION OR
LOAD SHEDDING
Rotor Angle
Frequency
Voltage
Stability
Stability
Stability
UFR, DF/DT
COMBINATION OF
CONVENTIONAL
RELAYS AND
BROADBAND
COMMUNICATION
DV/DT ,under
VoltageRELAYS
Small-Disturbance
Transient
Large-
Small-
Angle Stability
Stability
Disturbance
Disturbance
Voltage Stability
Voltage Stability
Source:-VLPGO WG
WHY SPS? OPERATIONAL REASONS
• OUTAGE OF HIGH CAPACITY GENERATING
UNITS,HVDC INTERCONNECTION OF LARGE
CAPACITY
• WIDE SEASONAL FLUCTUATION IN LOADING
PATTERN
• STAGGERING AND ROSTERING OF LOADS
CAUSING UNPRECEDENTED SKEWING
• SUDDEN IMPACT ON LARGE GRIDS DUE TO
SYsTEM DYANAMICS AND SWINGS.
WHY SPS? COMMERCIAL REASONS
• SKEWED GENERATION AND LOAD
PATTERN AND PRESSURE ON RELIABILITY
MARGINS DUE TO
– COMMERCIAL MECHANISMS
– OPEN ACCESS INCREASE IN TRADE VOLUME
– INCREASE IN COMPETITION
– UNBUNDLING AND RESTRUCTURING
WHY SPS? PLANNING ISSUES
• ECONOMY OF SCALE, LARGE PITHEAD PLANTS
AND LONG TRANSMISSION LINES
• THE SYSTEM PLANNERS TEND TO UTILIZE THE
EXISTING NETWORK
• DELAYS IN NETWORK EXPANSION DUE TO
ENVIRONMENTAL PROBLEMS
• SEASONAL OVER LOADS
• LINES AND GENERATORS NOT COMING IN
TANDEM
• EVACUATION OF RENEWABLES BY
DEROGATING RELIABILITY CRITERIA
AN EXAMPLE OF A BASIC SPS
INCREASED TRANSFER
CAPABILITY
DEFFERED INVESTMENT
INFINITE
GRID
THIS NETWORK IS
UNABLE TO
EVACUATE MORE
THAN 500 MW
2000 MW
GENERATOR
CONVERTER
TYPICAL
FLOW OF
1800-2000 MW
HIGH
CAPACITY
DC LINK
INVERTER
LOADS
SPS ACTION WOULD BE TO
TRIP THE GENERATORS IN
STAGES TO LIMIT FLOW ON
A-B SECTION.
IF SPS WERE NOT THERE
THE GENERATOR WOULD
BE CONSTRAINED OR A-B
SECTION WOULD
NECESSARILY HAVE TO BE
STRENGTHENED
TRADITIONAL PROTECTION
SCHEMES AND SPS
•
TRADITIONAL
SCHEMES
•
SPS
1. DESIGNED TO DETECT
SYSTEM DEFICIENCIES
1. PROTECTS INDIVIDUAL
AND TAKE CORRECTIVE
ELEMENTS
ACTION
2. STANDARDISED
2. EVOLVED BY
3. MANUFACTURER
EXPERIENCE
DRIVEN
3. UNIQUE
4. NARROW ‘VISION’
– LIMITED TO THE FAULTY 4. HOLISTIC APPROACH
–
ELEMENT
MAY DEGRADE SYSTEM
CONDITIONS FURTHER
–
–
PRE-EMPTIVE IN NATURE
PREVENTS SYSTEM
DETERIORATION
SPS is used
• During rare contingencies
• When focus for the protection is on the power
system supply capability rather than on a
specific equipment
• When consequences
condition is outside
conventional protection
of an operating
the capability of
SPS Characteristics
• Are normally sleeping systems
– Operate infrequently
• Control actions taken is predetermined
• Can be armed or disarmed depending upon
system conditions
• Can comprise a large number of coordinated
actions, in a cascaded manner
– Under frequency controlled load shedding
in a number of steps at different frequency
levels and/or with different time delays
SPS DESIGN
• DEFINE THE CRITICAL CONDITION
– STUDY OF PAST DISTURBANCES
– LOAD FLOW AND STABILITY STUDIES
• IDENTIFY RECOGNITION TRIGGERS
–
–
–
–
–
–
TRIP RELAYS,
HVDC POLE BLOCK SIGNALS
LOW VOLTAGE
LOW FREQUENCY
DF/DT
COMBINATION
• SUPER TRIGGERS
• OPERATOR CONTROL OF SPS
– AUTOMATIC ARMING/DISARMING
– MANUAL BASED ON OPERATORS
NOMOGRAMS/INFORMATION
OPERATOR NOMOGRAM FOR
ARMING/DISARMING SPS
CRITICAL SITUATION IN OTHER
PART OF GRID
FLOW ON RAIPUR-ROURKELA
ARM SPS-450
1000 MW
ARM SPS-1000
100 MW
800 MW
ΣFLOW ON BOTH CIRCUITS OF TALCHER-ROURKELA
Advantages of SPS
• Helps in operating power systems closer to their
limits
• Increase power transfer limit while maintaining
the same level of system security
• Increase the power system security particularly
towards extreme contingencies leading to
system collapse
TYPICAL SPS ACTIONS
•
•
•
•
•
•
•
•
Generation rejection
Turbine fast valving/generator run-back
Gas turbine/Pumping storage start-up
Under frequency load shedding
Under voltage load shedding
Remote load shedding
HVDC fast power change
Automatic shunt reactor/capacitor switching
TYPICAL SPS ACTIONS
• Controlled disconnection of interconnection/
area islanding
• Tap changer blocking and set point adjustment
• Quick increase of generator voltage set point
• Dynamic braking or braking resistor
• Actions on the AGC such as set point changes
PERCENTAGE OF MOST
COMMON SPS
Type
%
Type
%
Generation Rejection
21.6
Out Of Step Relay
2.7
Load Rejection
10.6
Discrete Excitation Control
1.8
U/F freq Load Shedding
8.2
Dynamic breaking
1.8
System Separation
6.3
Generator Runback
1.8
Turbine Valve Control
6.3
Var Compensation
1.8%
Load & Gen Rejection
4.5
Combination of Schemes
11.7
Stabilizers
4.5
Others
12.6
HVDC Controls
3.6
INDUSTRY EXPERIENCE WITH SPS
• REPORTED SCHEMES 111
• FIRST SPS INSTALLED IN 1930
• SCHEMES REPORTED BY GEOGRAPHICAL
REGIONS
GEOGRAPHICAL
REGION
% OF
SCHEMES
GEOGRAPHICAL
REGION
% OF
SCHEMES
USA
20.7%
EUROPE
16.2%
JAPAN
20.7%
AUSTRALIA
9%
CANADA
19.8%
OTHERS
13.6%
SURVEY IS ONLY INDICATIVE
Source:-P.M.Andersen
EXPERIENCE WITH SPS IN BRAZIL SYSTEM
Date/time
Description
SPS Control Actions
Consequences
Jul 6th, 2003
23h59min
Outage of 3 circuits – 765 kV associated with
Itaipu system (atmospheric strokes)
Generation drop (2,940MW) at Itaipú 60Hz
maintaining S/SE ties integrity
System stable
Δf = - 0.8Hz
Sept 16th, 2003
03h13min
Outage of 4 circuits - 765 kV connected to
Itaberá S/S due to atmospheric strokes and
protection against misoperation
Generation drop (1,400 MW) at Itaipu
60Hz, maintaining S/SE ties
System stable
Δf = - 0.4Hz
Dec 9th, 2003
17h39min
Outage of 10 circuits - 440 kV trunk & 2
transformers - 440/138kV at Bauru S/S
(busbar short-circuit)
Generation drop at hydro plants on
Paranapanema River to control
electromechanical system oscillations.
System stable
Δf = - 0.9Hz
No load shed
Sept 26th, 2004
05h38min
Clearing of 500 kV busbar at Jaguara S/S tripping of 4 circuits - 500 kV & 2
transformers - 500/345 kV (short-circuit)
Actuation of SPS avoided overload in
system equipment
System stable
Δf = - 0.7Hz
No load shed
Jun 14th, 2005
15h26min
Outages of 2 circuits - 765 kV associated
with Itaipu 60 Hz, 9 T Lines towers collapsed
(strong winds)
Generation drop at Itaipu 60 Hz (2800MW)
avoiding risk of opening remaining circuit
System stable
Δf = - 0.8Hz
No load shed
Oct 4th, 2005
20h40min
Tower collapse of 3 circuits Foz do Iguaçu Ivaiporã 765 kV, by strong winds, islanding
Itaipú (4,800 MW)
Out-of-step protections at the SE/NE and
N/SE ties avoiding propagation of
disturbance toward N and NE subsystems
System stable
Δf = - 1.7Hz
6.5% load shedding in
S/SE/MW subsystems
Mar 6th, 2005
15h04min
Accidental actuation of overload protection
in the electrodes lines of the Itaipu HVDC
link, during maintenance services in Bip. 1,
leading to Bip. 2 blocking
Correct actuation of out-of-step protection,
avoiding propagation of the disturbance
Load shedding scheme in S/SE regions
System stable
Interruption of 2,700 MW
transmitted by HVDC
(bipole 2)
2,154W load shedding
Δf = - 0.8Hz
Generation drop
( 2100 MW ) at Itaipu 60 Hz Power Plant
System stable
Δf = - 0.7Hz
HVDC transmission was
reduced from 6300 to 3150
MW
Sep 4th, 2005
15h04min
Loss of two 765 kV circuits connected to
Itabera S/S + outage of Bipole 1 (fallen
towers by strong winds)
Source:-Vlpgo wg
SPS SCHEMES IN SR
THE FIRST SCHEME: 1996
CONDITIONS
Line Name
Frequency POWER
Below
FLOW(MW)
(Hz)
Time
delay
(second)
Type of
Relay
CUDAPPAMADRAS
47.8
0.5
UF
SALEMBANGALORE
47.8
1
UF
CUDAPPAMADRAS
48.0
100
MW 0.5
towards
CUDAPPA
RPUF
SALEMBANGALORE
48.0
300
MW 1
towards
BANGALORE
RPUF
THE FIRST SCHEME: 1996
CONDITIONS
Line Name
Frequency POWER
Below (Hz) FLOW(MW)
Time delay Type of
(second)
Relay
CUDAPPA-MADRAS 47.8
0.5
UF
SALEMBANGALORE
1
UF
47.8
CUDAPPA-MADRAS 48.0
100
MW 0.5
towards
CUDAPPA
RPUF
SALEMBANGALORE
300
MW 1
towards
BANGALORE
RPUF
48.0
THE FIRST SCHEME: 1996
THE SR GRID IN
BHADRAVATI
JEYPORE
1996
1
RSTPP
P
GAZUWAKA
P
P
P
KHAMMAM
HYDERABAD
P
P
VIJAYAWADA
Nagjhari
RAICHUR
Kodasally
N
KAIGA
Kadra
NAGARJUNASAGAR
P
MUNIRABAD
P
SIRSI
GOOTY
P
DAVANAGERE
NELLORE
CUDDAPAH
HIRIYUR
NELAMANGALA
BANGALORE
P
P
MADRAS
HOODY
MAPS
By Tripping of SalemBangalore and
Cudddapah-Madras
Southern Grid was
getting devided into two
blocks
P
SALEM
NEYVELI
P
UDUMALPET
P
P
TRICHUR
TRICHY
P
MADURAI
FIG-2
SPS’s proposed in SR and its status of implementation
SPS @ Kolar Trip Signal 1 & 2
Commissioned
SPS @ Talcher 450/1000
Commissioned
Trip Signal 3 @ Kolar
Proposed & Under Implementation.
2
Modification of SPS @ Talcher Intertrip
Proposed & Under Implementation.
3
SPS @ Koodankulam
Proposed & Under commissioning, would
come along with Project
4
Intertrip @ Kali Complex
Proposed by PCC Sub-Committee. Under
Implementation
5
Intertrip @ Varahi
Proposed by PCC Sub-Committee.
6
Intertrip @ Salem for enhancing transfer
capability between S1 and S2 bid area
Proposed by SRLDC. Agreed by
Constituents.
Under Implementation.
7
Post Contingency generation ramp down at
Vemegiri Complex and LANCO for 400kV
Vijayawada-Nellore outage
8
Intertrip @ Madakathara to decongest for one
ICT tripping or one idukki-Lower PeriyarMadakathara trip
Commissioned
9
Intertrip @ 220kV Peenya to cut radial loads for
220kV NLM-Peenya line tripping
Under implementation
10
Intertrip for post contingency tripping of 220kV
Muddanur-Chnnakampally
Proposed by SRLDC. Yet to be
implemented
1
Proposed by SRLDC. Agreed by
Constituents
Under Implementation.
Typical flow directions in SR
TALCHER
BHADRAVATI
JEYPORE
RSTPP
DITCHIPALLY
GAJWEL
KALPAKKA
WARANGAL
GAZUWAKA
KHAMMAM
GHANAPUR
MAHABOOB
NAGAR
MMDP
P
N’SAGAR
VIJAYAWADA
RAICHUR
KURNOOL
MUNIRABAD
NARENDRA
SSLMM
BTPS
KAIGA
GOOTY
P
GUTTUR
KADAPA
P
NELLORE
HIRIYUR
TALGUPPA
HOODY
NELAMANGALA
ALMATHY
CHITTOOR
SRIPERUMBUDUR
KOLAR
SOMANAHALLI
KALAVINDAPATTU
HOSUR
MYSORE
NEYVELI
SALEM
NEYVELI TPS – 1 (EXP)
Highly loaded
Medium loaded
PUGALUR
UDUMALPET
TRICHUR
P
TRICHY
P
MADURAI
TIRUNELVELI
TRIVANDRUM
Lightly loaded
SIMHADRI
HVDC Kolar SPS
Kolar SPS Logic:
Trip signal-1
Kolar SPS Logic:
Trip signal-1: Load relief by constituents
Kolar SPS Logic:
Trip signal-2
Kolar SPS Logic:
Trip signal-2: Load relief by constituents
KOLAR SPECIAL PROTECTION SCHEME
Performance of the Scheme
FREQUENCY DIP DURING KOLAR HVDC TRIPING AND DURING SIMHADRI GENERATION LOSS
50.1
TAL-KOL TRIP ON15-09-06 AT 16:52 HRS
LOSS IS 1887 MW
49.9
FREQ IN HZ
49.7
49.5
49.3
49.1
SIMHADRI GEN LOSS OF
APPROX 950 MW ON 16-01-07
AT 1812 HRS
48.9
48.7
48.5
T-30 Minutes
T-25 Minutes
T-20 Minutes
T-15 Minutes
T-10 Minutes
Time
T-5 Minutes
T=0 Minutes
T+5 Minutes
2000
1800
1600
1400
1200
1000
800
600
400
200
0
49.55
Talcher-Kolar power flow
Frequency
49.5
49.45
49.4
49.35
49.3
Time
0:29
0:27
0:25
0:23
0:21
0:19
0:17
0:15
0:13
0:11
0:09
0:07
0:05
0:03
49.25
0:01
Power flow
Frequency Trend during the Tal-Kolar pole 2 trip
SPS AT TALCHER END
SPS 450-1000
Talcher SPS Logic:
SPS 450:
Talcher SPS Logic:
SPS 1000:
Talcher SPS Logic:
SPS 1000:
PROPOSED MODIFICATION TO SPS AT
HVDC KOLAR
PROPOSED MODIFICATION TO SPS AT HVDC KOLAR
•
•
•
LOGIC FAILS IF POWER GOES DOWN IN STEPS. SIGNAL 2 IS NOT SENT
GRID HOWEVER SEES A LARGER LOSS OF POWER
PROPOSED MODIFICATION: INCREASED WINDOW OF JUDGEMENT, LINE FAULT AS INPUT
Sr.No.
Event
1
Talcher-Kolar Pole-2 Tripped and
Pole-1 went to Ground Return
Power Flow:2106 MW to 142 MW
Frequency: 49.28 Hz to 48.5 Hz
2
Talcher-Kolar Pole-2 Tripped and
Pole-1 went to Ground Return
Power Flow:2252 MW to 142 MW
Frequency: 49.20 Hz to 48.5 Hz
3
Talcher-Kolar Pole-1 Tripped and
Pole-2 went to Ground Return
Power Flow:1380 MW to 141 MW
Frequency: 49.44 Hz to 48.60 Hz
Date of
Occurrence
03.04.2009
04.04.2009
10.06.2009
Time of
Occurence
Reason
Remarks
12:08
DC Line fault in Pole2,
Distance 13.18 km
from Talcher end
(Tower no. 40)
Signal-1 sent
10:34
DC Line fault in Pole2,
Distance 14.5 km
from Talcher end
(Tower no. 43)
Signal-1 sent
19:17
DC Line Fault in Pole1,
Distance 498.1 km
from Kolar
end(Tower no.2334)
Signal-1 sent
Talcher-Kolar Flow and Frequency on 13/02/2009 during Pole-1 Tripping
Talcher-Kolar MW is at Kolar end
2000
50
TAL-KOL FLOW
1710 MW
at 06:24 Hrs
1800
49.8
1600
1400
49.6
1252 MW
at 06:26 Hrs
FREQUENCY
MW
1200
1000
49.4
49.2
643 MW
at 06:28 Hrs
49
49.19 MW
at 06:24 Hrs
800
48.8
380 MW
at 06:30 Hrs
600
48.63 MW
at 06:27 Hrs
400
48.4
200
0
6:20
48.6
48.2
6:22
6:24
6:26
6:28
TIME
6:30
6:32
48
6:34
Talcher-Kolar SPS Logic Diagram MODIFIED
PERFORMANCE OF THE SPS
No. of one
Pole / Bipole
trips
No. of times System Protection Scheme
Operated
Operated correctly
Mal-Operated
Failed to operate
69
27
21
6
9
• Mal-operation On six occasions the scheme operated when not
required to operate due to failure of the HVDC measuring
equipments like Optodyne
• Non operation. On Nine occasions defense mechanism failed to
operate when required due to following reasons
– On four occasions when one of the pole tripped on ground fault inter trip
signal was not generated. The logic was working only on power flow
levels and line fault signal was not used. This has been taken care in the
Stage –II SPS logic development
– Problem with the logic in 1 case, during the initial stages of the logic
development, which was latter corrected.
– In the remaining four cases, three cases non operation was due to the
signal input. The power level signals were derived from HVDC control
which was changing only in steps therefore decisions were influenced by
the power levels in specified steps at times,could not detect the actual
loss of power of more than 400MW. This has been taken care in the
Stage –II SPS logic development
– Remaining one case due to control supply failure
Based on survey in 2003
SPS PLC SCHEMATIC
ANALOG
INPUT
DIGITAL
INPUT
PROGRAMMABLE
LOGIC
CONTROLLER
ONLY ONE
REQUIRED
FOR AN SPS
SCHEME
DIGITAL OUTPUT
DIGITAL TELEPROTECTION COUPLER
K1
K2
K3
FIBER
OPTIC
≈
VIRTUAL MAPPING
OF CONTACTS
K4
CABLE
DIGITAL TELEPROTECTION COUPLER
K1
K2
K3
K4
WIRED TO TRIP RELAY
ONE SET FOR
EACH SIGNAL
PATH
SPS FOR KOODANKULAM
• CONTINGENCY LEVEL ABOUT THE SAME AS
TALCHER-KOLAR
– SINGLE UNIT TRIPPING : 1000 MW
– STATION LOSS : 2000 MW
• LARGE DIPS IN FREQUENCY LIKELY
• CONVENTIONAL PROTECTION SCHEMES
MIGHT BE INADEQUATE
• LARGE INCREASE IN NORTH-SOUTH FLOWS
LIKELY DUE TO TRIPPING
– OSCILLATIONS IN THE SYSTEM
– REDUCED SECURITY
– TRUNK CORRIDOR LOADING
SUGGESTED FEATURES
• SCHEME TO BE MADE PART OF THE PROJECT
• GRANULARITY OF SIGNAL TO BE GENERATED TO BE
DECIDED
– ONE SIGNAL ON ONE UNIT TRIP
– SECOND SIGNAL ON BOTH UNITS TRIP
• SIGNAL WOULD BE TRANSMITTED THROUGH
WIDEBAND TO LOCATIONS DECIDED FOR TALCHERKOLAR INTER TRIP
• SIGNAL TO BE TRANSMITTED THROUGH WIDEBAND
FROM KOODANKULAM TO KOLAR
POWER DEMAND OVER-RIDE
GAZUWAKA POLE1
POWER DEMAND OVER-RIDE
GAZUWAKA POLE2
BHADRAWATHI
400kV Hosur-Salem SPS
Congestion Management in SR: Between S1, S2 bid area
Snapshot of 400kV Hosur-Salem flow 725MW on 19-Jan-2010 18:52 Hrs
Congestion Management in SR: Between S1, S2 bid area
• IN N-1 CONDITION, 400KV HOSUR-SALEM
AND 400KV SOMANAHALLI-SALEM GETTING
SEVERELY LOADED.
• CASCADE TRIPPING AND SEPARATION
CANNOT BE RULED OUT
• TO LIMIT THE POST CONTINGENCY FLOW
BELOW 800MW, IT WAS DECIDED TO PUT
LIMIT ON S1-S2 Ʃ OF S2 MEMBERS
SCHEDULE.
• AFTER CONDUCTING LOAD FLOW STUDY,
SCHEDULE DECIDED FOR S2 AREA
CONSTITUENTS WAS 5000MW WITH FULL
NEYVELI COMPLEX AVAILABILITY.
SPS for Hosur – Salem…….
• Intent: To relieve post contingency(N-1) stress
on
400kV
Kolar-Hosur-Salem
and
400kV
Bangalore-Salem
• Scheme: disconnection of about 300 MW in
and around Salem after sensing of line trip in
the above corridor. This would increase TTC by
80-100 MW
SPS for Congestion Management: Between S1,S2 Bid Area
GOOTY
561
250X2
486
511
270
334X2
67x2
420
364
677x2
139
234
615
690
92x2
Base Case
HVDC Kolar import-2300 MW
HVDC Gazuwaka Import-600 MW
HVDC Bhdrawati Import-500 MW
361
Voltages
394
Kolar-393 KV
Hosur-386 KV
Salem-387 KV
Somanahalli-389 KV
Neelamangala-390 KV
Hoody-390 KV
Udumalpet-393 KV
NLYTs2-401 KV
KV Pattu-376 KV
SRPD-398 KV
SPS for Congestion Management: Between S1,S2 Bid Area
GOOTY
573
254X2
520
478
205
350X2
152x2
460
460
441x2
293
356
908
164x2
HVDC Kolar import-2300 MW
HVDC Gazuwaka Import-600 MW
HVDC Bhdrawati Import-500 MW
Voltages:
322
352
Kolar-386 KV
Hosur-379 KV
Salem-382 KV
400kV Hosur-Salem-OUT
Somanahalli-383 KV
Nelamangala-383 KV
Hoody-383 KV
Udumalpet-390KV
NLYST2-399 KV
KVPattu-370 KV
SRPD-372 KV
SPS for Congestion Management: Between S1,S2 Bid Area
GOOTY
512
234X2
515
419
205
325X2
180x2
455
440
403x2
206
351
785
140x2
HVDC Kolar import-2300 MW
HVDC Gazuwaka Import-600 MW
HVDC Bhdrawati Import-500 MW
327
Voltages
357
Kolar-399 KV
Hosur-392 KV
Salem-392 KV
400kV Hosur-Salem-OUT
Somanahalli-392 KV
Neelamangala-395 KV
With load shedding of 300 MW
at Salem
Hoody-395 KV
Udumalpet-396 KV
NLYTs2-403 KV
KV Pattu-399 KV
SPS for Congestion Management: Between S1,S2 Bid Area
GOOTY
563
251X2
516
493
243
340X2
105x2
435
415
980
185
285
708
575
103x2
HVDC Kolar import-2300 MW
HVDC Gazuwaka Import-600 MW
HVDC Bhdrawati Import-500 MW
356
Voltages
388
Kolar-390 KV
Hosur-379 KV
Salem-383 KV
400kV Kolar-Hosur one
circuit -OUT
Somanahalli-384 KV
Neelamangala-389 KV
Hoody-389 KV
Udumalpet-391 KV
NLYTs2-400 KV
Kv Pattu-376 KV
SPS for Congestion Management: Between S1,S2 Bid Area
GOOTY
512
234X2
512
413
152
328X2
191x2
418
455
643
219
364
814
143x2
HVDC Kolar import-2300 MW
HVDC Gazuwaka Import-600 MW
HVDC Bhdrawati Import-500 MW
400kV Kolar-Hosur one
circuit -OUT
400kV Hosur-Salem-OUT
With load shedding of 300 MW
at Salem
328
Voltages
358
Kolar-397 KV
Hosur-385 KV
Salem-391 KV
Somanahalli-390 KV
Neelamangala-393 KV
Hoody-393 KV
Udumalpet-395 KV
NLYTs2-403 KV
Kv Pattu-382 KV
400kV VijayawadaNellore SPS
400 KV GRID MAP OF SOUTHERN REGION
Snapshot of 400kV Vijayawada-Nellore 550MW each and Low Voltages in Sothern
part of SR on 25-02-2010 18:44 Hrs
Snapshot of 400kV Vijayawada-Nellore 580MW each and Low Voltages in Sothern
part of SR on 17-03-2010 16:32 Hrs
Snapshot of 400kV Vijayawada-Nellore 600MW each and Low Voltages
in Southern part of SR on 18-03-2010 16:43 Hrs
Snapshot of 400kV Vijayawada-Nellore 593MW each and Low Voltages
in Southern part of SR on 06-02-2010 08:06 Hrs
Snapshot of 400kV Vijayawada-Nellore 593MW each and Low Voltages
in Southern part of SR on 21-02-2010 14:53 Hrs
Time in HH:MM ---->
0:00
23:00
22:00
21:00
20:00
19:00
18:00
17:00
16:00
15:00
14:00
13:00
12:00
11:00
10:00
9:00
8:00
7:00
6:00
5:00
4:00
3:00
2:00
1:00
0:00
Flows in MW ---->
Graph of 400 KV Vijayawada – Nellore lines Flows on 30-Mar-10
650
630
610
590
570
550
530
510
490
470
450
Typical Day 400 KV Vijayawada – Nellore Flow
(07–April–10)
600
580
560
520
500
480
460
Time in HH:MM ---->
400 KV Vijayawada - Nellore - I
400 KV Vijayawada - Nellore - II
0:00
23:00
22:00
21:00
20:00
19:00
18:00
17:00
16:00
15:00
14:00
13:00
12:00
11:00
10:00
9:00
8:00
7:00
6:00
5:00
4:00
3:00
2:00
1:00
440
0:00
Flow in MW ----->
540
Graph of 400 KV Vijayawada – Nellore lines Flows on 15-Apr-10
900
788 MW
800
Flow on Ckt 2 while
tripping of Ckt 1
700
500
400
300
200
100
Time in HH:MM --->
Vijayawada - Nellore Ckt I
Vijayawada - Nellore Ckt II
0:00
23:00
22:00
21:00
20:00
19:00
18:00
17:00
16:00
15:00
14:00
13:00
12:00
11:00
10:00
9:00
8:00
7:00
6:00
5:00
4:00
3:00
2:00
1:00
0
0:00
Flows in MW ---->
600
SPS FOR VIJAYAWADA NELLORE
• Intent: To relieve post contingency (N-1) stress on
400kV Vijayawada-Nellore.
• Scheme: Reduction of Generation about 400 MW
in Vemagiri complex and LANCO(STAGE-2) on
tripping of one circuit when flow is more than 550
MW each.
• Status: APTRANSCO agreed in principle
SPS ACTION
REDUCTION AT LANCOVEMAGIRI COMPLEX
Study for Requirement SPS for 400kV Vijayawada-Nellore outage
KHAMMAM
LANCO GENERATION: 350
MW
LANCO
VTS
SRISAILEM
NELLORE
VIJAYAWADA
VEMAGIRI COMPLEX
GEN.
1) GMR-VEM – 365 MW
2) GOUTHAMI – 460 MW
3) KONASEEMA –430 MW
4) JEGURUPADU2-225MW
STEADY STATE LIMIT OF EACH CKT OF VJA-NLR are:
1) WITH NO COMPENSATION: 630 MW
2) WITH REATORS AT ONE END:548 MW
3) WITH REACTORS AT BOTH ENDS : 452 MW
* 400KV VIJAYAWADA-NELLORE-2 NELLORE END RECTOR
OUT
ALMATTI
Study for Requirement SPS for 400kV Vijayawada-Nellore outage
400KV VIJAYAWADA-NELLORE ONE CIRCUIT OUT
KHAMMAM
LANCO GENERATION: 350
MW
LANCO
VTS
SRISAILEM
VIJAYAWADA
VEMAGIRI COMPLEX
GEN.
1) GMR-VEM – 365 MW
2) GOUTHAMI – 460 MW
3) KONASEEMA –430 MW
4) JEGURUPADU2-225MW
805
NELLORE
STEADY STATE LIMIT OF EACH CKT OF VJA-NLR are:
1) WITH NO COMPENSATION: 630 MW
2) WITH REATORS AT ONE END:548 MW
3) WITH REACTORS AT BOTH ENDS : 452 MW
* 400KV VIJAYAWADA-NELLORE-2 NELLORE END RECTOR
OUT
ALMATTI
Study for Requirement SPS for 400kV Vijayawada-Nellore outage
400KV VIJAYAWADA-NELLORE ONE CIRCUIT OUT AND 430 MW GENERATION BACKDOWN
KHAMMAM
LANCO GENERATION: 260MW
Generation reduced at VEMAGIRI
COMPLEX and LANCO
1) GMR-VEM – 90 MW
2) GOUTHAMI – 100 MW
3) KONASEEMA –100 MW
4) JEGURUPADU2-50MW
5) LANCO- 90 MW
LANCO
VTS
SRISAILEM
VIJAYAWADA
VEMAGIRI COMPLEX
GEN.
1) GMR-VEM – 275 MW
2) GOUTHAMI – 360 MW
3) KONASEEMA –330 MW
4) JEGURUPADU2-175MW
715
NELLORE
STEADY STATE LIMIT OF EACH CKT OF VJA-NLR are:
1) WITH NO COMPENSATION: 630 MW
2) WITH REATORS AT ONE END:548 MW
3) WITH REACTORS AT BOTH ENDS : 452 MW
* 400KV VIJAYAWADA-NELLORE-2 NELLORE END RECTOR
OUT
ALMATTI
Muddanur SPS
Study for Requirement SPS for Muddanur Generating station
WITH FULL GENERATION AT MUDDANUR
PULIVENDULA
RADIAL
44X2
966 MW
MUDDANUR
234X2
94X2
112X2
YERRAGUNTLA
RADIAL
ANATHAPUR
CHINAKAMPALLI
Study for Requirement SPS for Muddanur Generating station
ONE CKT of 220kV Muddanur-Chnakampalli OUT
PULIVENDULA
PULIVENDULA
RADIAL
RADIAL
47X2
42X2
966 MW
MUDDANUR
666 MW
MUDDANUR
401
109X2
128X2
230
CHINAKAMPALLI
70X2
106X2
CHINAKAMPALLI
YERRAGUNTLA
YERRAGUNTLA
ANATHAPUR
RADIAL
ANATHAPUR
RADIAL
SPS ACTION: REDUCE GENERATION BY 300 MW OR
TRIP ONE UNIT AND REDUCE 100 MW
Study for Requirement SPS for Muddanur Generating station
Both CKTs of 220kV Muddanur-Chnakampalli out
PULIVENDULA
PULIVENDULA
RADIAL
RADIAL
65X2
48X2
966 MW
MUDDANUR
566 MW
MUDDANUR
204X2
214X2
CHINAKAMPALLI
98X2
138X2
YERRAGUNTLA
ANATHAPUR
YERRAGUNTLA
RADIAL
ANATHAPUR
RADIAL
SPS ACTION: REDUCE GENERATION BY 400 MW
OR TRIP TWO UNIT
CHINAKAMPALLI
Varahi SPS
VARAHI SPS
• More than 450 MW at Varahi and 600
MW of UPCL had to be evacuated
through 220kV Varahi-Shimoga D/C line
and 220kV Kemar-Shimoga S/C circuit.
• 220kV Varahi-Shimoga D/C line severly
loaded with No N-1 reliability.
• In case of tripping of one of the circuits
generation to be backdown at Varahi
and UPCL
VARAHI SPS
Conectivity of VARAHI AND UPCL:
SHARAVATHI
SHIMOGA
Lines severly load with
no N-1
VARAHI
(450MW)
UPCL
KEMAR
(600MW)
PUTTUR
Load is around 300 MW
KAVOOR
Another unit of UPCL is in pipe line. So SPS at varahi is very much necessary
NAGJHERI SPS
NAGJHERI SPS
1. Nagjheri Gen 850MW
BELGAM
2. Kodasalli Gen 120 MW
3. Kadra Gen 150 MW
NARENDRA
70MWx2
4. Kaiga Gen 660 MW
AMBEWADI
144MWx2
150MWx2
80MWx2
All 220 kV lines in
Nagjheri area are in service
152MWx2
NAGJHERI
HUBLI
23MWx2
86MW
156MWx2
BIDNAL
144MWx2
KODASALLI
77MW
2MW
KADRA
96MW
KAIGA
PRESENT SPS WAS
DESIGNED TO MONITOR
NJPH-KODASALLI FOR
REVERSAL AND TRIP
UNITS TO PROTECT
KAIGA (WHEN KAIGA
UNITS WERE EVACUATED
THROUGH 220 KV)
NAGJHERI SPS
1. Nagjheri Gen 850MW
BELGAM
2. Kodasalli Gen 120 MW
3. Kadra Gen 150 MW
NARENDRA
70MWx2
4. Kaiga Gen 660 MW
AMBEWADI
161MWx2
168MWx2
58MWx2
220kV Nagjheri-Bidnal one line
tripped
185MW
NAGJHERI
HUBLI
10MWx2
185MWx2
KODASALLI
191MW
BIDNAL
150MWx2
95MW
In this case 220kV NagjheriHubli/Bidnal line and 220kV
Nagjheri- Ambewadi line are
getting over load
To bring flows to normal there
is a requirement to trip one
Nagjheri Unit(150MW)
5MW
KADRA
103MW
KAIGA
NAGJHERI SPS
1. Nagjheri Gen 850MW
BELGAM
2. Kodasalli Gen 120 MW
3. Kadra Gen 150 MW
NARENDRA
81MWx2
4. Kaiga Gen 660 MW
AMBEWADI
138MWx2
197MWx2
220kV Nagjheri-Hubli/Bidnal
TWO lines tripped
13MWx2
226MW
In this case 220kV Nagjheri-Hubli/Bidnal
line and 220kV Nagjheri- Ambewadi line
are getting over load
NAGJHERI
HUBLI
10MWx2
232MW
141MW
BIDNAL
KODASALLI
123MW
160MWx2
16MW
KADRA
113MW
KAIGA
To bring flows to normal there is
a requirement of Two Nagjheri
Units tripping(150MW each)
PMU’s Proposed
Ramagundam Islanding
scheme
Thank You