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Slide 1
.
A New Load Shedding System for Industrial Loads
in the Italian Power System
Giorgio GiannuzziGRTN – Grid Division
7th International Workshop on Electric Power Control CentersOrtisei, 28 Maggio 2003
giannuzzi.giorgio@grtn.itwww.grtn.it
Slide 2
Typical power flowTypical power flow
4.130
.
SLOVENIA
SVIZZERA AUSTRIA
FRANCIA
GRECIA
FRANCIA(Corsica)
Milano
Roma
Venezia
Firenze
Napoli
Palermo
Cagliari
Torino
Slide 3
Feared phenomenaFeared phenomena
• Fast phenomena AUTOMATIC LOAD SHEDDING(<1 sec)– Pole slipping due to transient instability– Distance protection false trip due to stable oscillation– Several distance protection trips (chain reaction) due to
instable oscillations• Slow phenomena MANUAL LOAD SHEDDING
– Voltage instability– Distance protections trips due to overcharge (max power or
max current)
52 % of peak load underfrequency relays24 % of peak load manual/automatic load shedding
Slide 4
MAIN REQUIREMENTSMAIN REQUIREMENTS•to be a final user, so that the responsibility of the consequences of shedding can be directlyattributed to the customer;
•to be users powered by the high voltage network;
• to have a shedding power above a certain limit;
•to select and document loads relating to the assigned bands, as an Interruptible Customercan shed loads both in real time and upon notice;
•to guarantee a continuous service of the RTU apparatus, and of the router connected to it;
•to guarantee there are no timers, by-pass circuits, relays, PLCs (Programmable LogicController) between the RTU apparatus and the interruptible load;
•to realise a blocking circuit upon re-closure by GRTN, and to present suitable presettings toassure the redundancy of the opening commands received;
•to guarantee security for people, equipment and productive processes, releasing GRTN fromany civil and criminal responsibility as regards damages to things or people due to loadshedding.
““To verify that Interruptible Customers meet GRTNTo verify that Interruptible Customers meet GRTNrequirementsrequirements””
IC & on field verifications: CESI roleIC & on field verifications: CESI role
Slide 5
Interruptible CustomersInterruptible Customers
FAST PHENOMENAFAST PHENOMENA ““REAL TIME ICREAL TIME IC””
(direct CB opening < 200 (direct CB opening < 200 msms))
SLOW PHENOMENA SLOW PHENOMENA ““DEFERRED ICDEFERRED IC””
(operating time < 15(operating time < 15’’))
COMMUNICATIONINTERFACE(ROUTER)
RTU
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
CR
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DOPPIO CANALE DI COMUNICAZIONE(PROVIDER TELEFONICO)
CARICOINTERROMPIBILE
CONVERTORE(POTENZA
ISTANTANEA ASSORBITA)
TA
TV
POSIZIONE INTERRUTTORE DEL CARICO
COMANDO DI DISTACCO
MORSETTIERA
sigillata
COMMUNICATIONINTERFACE(ROUTER)
RTU
COMMUNICATIONINTERFACE(ROUTER)
RTU
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
CR
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DOPPIO CANALE DI COMUNICAZIONE(PROVIDER TELEFONICO)
CARICOINTERROMPIBILE
CONVERTORE(POTENZA
ISTANTANEA ASSORBITA)
TA
TV
POSIZIONE INTERRUTTORE DEL CARICO
COMANDO DI DISTACCO
MORSETTIERA
sigillataM
ORSETTIERA sigillata
ST
LOADPOWER
CONVERTER
ROUTERROUTER
GRTNFRAMERELAY
ACC
LOADLOAD
CT
VT
LOAD SWITCH POSITION
LOAD SHEDDING COMMAND
REDOUNDANTCOMMUNICATIONCHANNEL
NCC
TERMINALSTRIP (ROUTER)
RTU
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
CR
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DOPPIO CANALE DI COMUNICAZIONE(PROVIDER TELEFONICO)
CARICOINTERROMPIBILE
CONVERTORE(POTENZA
ISTANTANEA ASSORBITA)
TA
TV
CONFIRMATION
REDUCTION REQUEST
MO
RSETTIERA sigillata LOCAL
LOAD SHEDDING SYSTEM
(ROUTER)
RTU
(ROUTER)
RTU
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
CR
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CR
RETE DI RETE DI COMUNICAZIONECOMUNICAZIONE
GRTNGRTN
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DEC 3000 AXPAlpha
DEC 3000 AXPAlpha
CNC
DOPPIO CANALE DI COMUNICAZIONE(PROVIDER TELEFONICO)
CARICOINTERROMPIBILE
CONVERTORE(POTENZA
ISTANTANEA ASSORBITA)
TA
TV
CONFIRMATION
REDUCTION REQUEST
MO
RSETTIERA sigillata
MO
RSETTIERA sigillata LOCAL
LOAD SHEDDING SYSTEM
REDOUNDANTCOMMUNICATIONCHANNEL
GRTNFRAMERELAY
ACC
LOADPOWER
CONVERTER
LOADLOAD
ROUTERROUTER
RTURTU
VT
CT
TERMINALSTRIP
NCC
Slide 6
ACC FIRENZE
ACC MILANO
ACC NAPOLI
ACC VENEZIA ACC PALERMO
ACC CAGLIARI
ACC TORINO
NCC ROMA
GRTNGRTNFRAME RELAYFRAME RELAY
WANWAN
Communication & Overall ArchitectureCommunication & Overall Architecture
PROTOCOLS
IEC 870-5-104 on TCP MANUAL/AUTOMATIC LS IEC 870-5-104M on UDP VERY FAST AUTOMATIC LS
Slide 7
RTU
RTU
RTURTU
RTURTURTU
RTU RTU
Centralsystem
Loadshedding
Loadrejection
command
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���������������������������RTU
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RTU
���������������������������
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���������������������������RTU
Concentrator
Loadshedding
Loadshedding
Protectiontripping
Automatic IC load sheddingAutomatic IC load shedding
Load shedding RTU (Fingers)• Start communication• Subscription to the group address• Armed by the Center to interesting events (by bitstring)• In absence of the Center, default arming
Load shedding multicast event generators RTU(Sentinels)
Slide 8
Multicast benefitsMulticast benefits
Each RTU subscribe itself only to interest events
Periodically the Center arms RTUs basing on DSA calculations (byCESI)
The Center transfers by bitstring the event address
Every information it is available to everyone on the network
Optimization of traffic with IGMP
DSA: prototype finetuning and testing in progress
Automatic multicast load shedding (available only by manualconfiguration)
Multicast RTU diffusion: all the ICs; next step: to be available on allthe Italian load shedding system (distribution and transmissionplants)
Project statusProject status
Slide 9
MMIMMIquick, simple and efficient shedding of interruptible loads in real time;
coordinated and flexible shedding management between GRTN Control Rooms;
separate management of the different types of shedding;
interfacing of the new load shedding system with national network’s controlsystem;
allows data exchange with GRTN Energy Management Systems;
Slide 10
Other systems interfacesOther systems interfacesIMC CLIENTS
ACC
GRTNGRTNFRAME RELAY WANFRAME RELAY WAN
IMC SERVERS
GRTNGRTNEMS/SCADA SYSTEMEMS/SCADA SYSTEM
NCC
IMC CLIENTS
BILLING & SETTLEMENT INTERFACE (*.XML FILES)· LOAD SHEDDING DURATION· SHEDDED LOADS LIST· POWER SHEDDED AND UNSUPPLIED ENERGY· POWER DEVIATION FROM CONTRACTUAL DUTIES· LOCAL LOAD SHEDDING UNAVAILABILITY
Intranet interface (via WEB server)
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