A New Load Shedding System for Industrial Loads in the ... giannuzzi.pdf · A New Load Shedding...

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

[email protected]

Typical power flowTypical power flow

4.130

.

SLOVENIA

SVIZZERA AUSTRIA

FRANCIA

GRECIA

FRANCIA(Corsica)

Milano

Roma

Venezia

Firenze

Napoli

Palermo

Cagliari

Torino

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

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

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


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


RTU


RTU

DEC 3000 AXPAlpha

CR


GRTNGRTN

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC

DEC 3000 AXPAlpha

CR

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CR


GRTNGRTN

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC



CONVERTORE(POTENZA


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


GRTNGRTN

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC

DEC 3000 AXPAlpha

CR

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CR


GRTNGRTN

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC



CONVERTORE(POTENZA


TA

TV

CONFIRMATION

REDUCTION REQUEST

MO

RSETTIERA sigillata LOCAL

LOAD SHEDDING SYSTEM

(ROUTER)

RTU

(ROUTER)

RTU

DEC 3000 AXPAlpha

CR


GRTNGRTN

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC

DEC 3000 AXPAlpha

CR

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CR


GRTNGRTN

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC

DEC 3000 AXPAlpha

DEC 3000 AXPAlpha

CNC



CONVERTORE(POTENZA


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

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

RTU

RTU

RTURTU

RTURTURTU

RTU RTU

Centralsystem

Loadshedding

Loadrejection

command

��

��

��RTU

��

��

��

��

RTU

��

��

��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)

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

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;

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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