Download pdf - Langgpdon SVC Replacement APIC 2010 - …apic/uploads/Forum/Langdon SVC...Langgpdon SVC Replacement APIC 2010 Colin Clark APIC Power & Energy Innovation Forum Varun Chhibbar Outline

Langdon SVC Replacement g pAPIC 2010

Colin Clark

APIC Power & Energy Innovation Forum

Varun Chhibbar

OutlineOutline

• DefinitionsDefinitions• Purposes of the Langdon SVC

Th L d SVC R l t P j t• The Langdon SVC Replacement Project• Design Improvements• Lessons learned• HighlightHighlight


DefinitionsDefinitions

• Static Var Compensator (SVC)Static Var Compensator (SVC)– Controls reactive power with conventional

Inductors and CapacitorsInductors and Capacitors– Acts as a variable shunt impedance

• Thyristor or SCR Silicon Controlled• Thyristor or SCR – Silicon Controlled RectifierV l b k t b k th i t i ith• Valve – a back to back thyristor pair with snubber circuit


Definitions ContDefinitions Cont…• TCR – Thyristor Controlled ReactorTCR Thyristor Controlled Reactor• TSC – Thyristor Switched Capacitor

6 Pulse SVC fires 6 times per cycle• 6 Pulse SVC fires 6 times per cycle• 12 Pulse SVC fires 12 times per cycle


12 Pulse SVC(Old Langdon SVC)

240 kV

20 kV20 kV

TCR TSC TCR TSC13th11th 23th 13th11th 23th


Langdon SVC FunctionallityLangdon SVC Functionallity• Voltage control of the 240 kV bus (253 kV)

S t di t b• System disturbance response• Reduce overvoltages for 1201L energization

t ior trip• Improve system performance during load

h ddishedding• Increase stability limit of the network• Assist operators with dispatch of switched

capacitor banks


Main Project DriversMain Project Drivers• Control system no longer supported (1985)• Few thyristor spares remaining• UV damage and checking of main air coreUV damage and checking of main air core

reactors• Inherent cooling issues that limited output• Inherent cooling issues that limited output

• Reactor valve overheating due to cooling system failure – June 2nd 2008


Langdon Project RequirementsLangdon Project Requirements

• Like for like replacementLike for like replacement• AESO request - capability to control

remote mechanically switched capacitorsremote mechanically switched capacitors• Same physical location (P&L for fence)






2 x 3” AL FLAT BUS2 x 3 AL FLAT BUS

1/2” COPPER TUBING1/2” COPPER TUBING


The Langdon ProjectThe Langdon Project+ Two Phases+ Phase One – complete December 19th 2008

- 4 months to replace TCR valves etc4 months to replace TCR valves, etc. Different cooling pressure and firing signalsThree control systems (CWC-85, VarMach-99, Mach2-08)y ( , , )

+ Phase Two – complete November 26th 2009Replace remaining equipment- Replace remaining equipment


Actual VI CurveActual VI Curve• Rating

± 250 MVAr @ 1.0pu± 302.5 MVAr @ 1.1 pu473 MVAr Rx, 10 min overload


HMI HMI –– Single LineSingle Line


HMI HMI -- CoolingCooling



12 Pulse SVC(New Langdon SVC)

240 kV

20 kV20 kV

TCR TSC TCR TSC12th 12th

31 MVAr 31 MVAr156 MVAr 94 MVAr 94 MVAr156 MVAr


156 MVAr 94 MVAr 94 MVAr156 MVAr

Design Improvementsg p• Simplified filter design• Elimination of legacy air switches • Bus protection without groundingBus protection without grounding

transformers• Enhanced surge protection• Enhanced surge protection• Thyristor replacement without draining

licooling


Design Improvementsg p• Lifecycle sparing approach – 220 line items• Cooling: fewer piping connections, SS

versus PVC, pump HMI, p p• Controls over DNP with hardwire backup• Low noise design• Low noise design• Bird and rodent ‘resistant’






Langdon SVCProtection Block Diagram

240 kV

20 kV20 kV

TCR TSC TCR TSC12th 12th


Lessons LearnedLessons Learned

• Design ReviewsDesign Reviews

86-1 Breaker TC1Trip


Trip Logic






Trip Logic






Trip Logic






Trip Logic






Trip Logic






Trip Logic


Lessons LearnedLessons Learned• Clear outage plans• Study models• Never assumeNever assume• Involvement of field technicians

O li f i ti• Open lines of communication• On-site supervision• Clear Interface points


Lessons LearnedLessons Learned• On-site involvement of ACC operator• Burn-in period• Local project managementLocal project management• Complications due to phase approach

K l d bl i i i t ff• Knowledgeable commissioning staff• Built in fault recording system


HighlightHighlight

Trip the inter-tie with BC (1201L) underTrip the inter tie with BC (1201L) under different import and export conditions

Operate the SVC at its thermal limit



QUESTIONS?Q
