General Purpose Steam Turbine Control Application (STCA-GP ...
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General Purpose Steam Turbine Control Application (STCA-GP) for mechanical drives Main components • Industrial PLC • Operator display • PC based configuration tool • Serial interfacing to PCS Steam Turbine Control Application • Selection of two or three speed probes • Automatic fallback response to speed probe failure Predictive control response • Configurable setpoint and process variable • Predictive response to avoid overspeed upon sudden driven load changes Open loop response • Increase availability and operability of the driven unit which may otherwise trip on overspeed due to sudden load change • Actuator control response dampening upon compressor surge detection Actuator output • Linearization of actuator output • Valve actual position deviation alarming (if position feedback is available) Sequencing • Full automatic cold, warm and hot start of turbine • Automatic start up timing based on running and shutdown timing • Automatic warmup timing based on casing or flange temperatures • Critical speed zone ramping and avoidance • Loading and unloading of a compressor in conjunction with its companion performance and antisurge controllers Kabelweg 37 • 1014 BA • Amsterdam • The Netherlands T +31 (0)20 6376 801 • F +31 (0)20 6362 780 • www.control-care.com • info@control-care.com Control solutions to the Oil & Gas, Chemical and Petrochemical industries world wide The turbine governor control or Steam Turbine Control Application (STCA-GP) developed by Control-Care enables fully automated speed control during normal operation as well as start-up/shutdown speed control including critical speed avoidance. It provides a versatile and economical way to regulate your steam turbine’s speed, protects the turbine against overspeed damage and automatically sequences startups and shutdowns. The STCA is fully configurable to API611 general purpose steam turbines and is typically integrated into the train control system. This integration results in improved train control system availability and reliability as well as in reduced system cost. The entire Control-Care turbine and compressor control scheme can include compressor antisurge (ACA) and performance (PCA) control, compressor auxiliaries sequencing, parametric diagnostics and ESD system interfacing. Set point mode selection • Internal setpoint • Local setpoint • Remote setpoint • Cascade setpoint • Analog, pushbuttons, serial link Limiting control • Maintain turbine speed within allowable operational range • Maintain predefined process variables within limits Cascade control • Control of an alternate process variable using an independent set of tuning parameters Overspeed prevention • Keep steam turbine speed at or below maximum operating speed using predictive control response or open loop response Overspeed and acceleration protection • Turbine trip when the rotor speed or acceleration exceeds allowable limit Calculated variables • Current speed indication based on numberof installed probes and functioning probes
Transcript of General Purpose Steam Turbine Control Application (STCA-GP ...
General Purpose Steam Turbine Control Application (STCA-GP)
for mechanical drives
Main components• IndustrialPLC• Operatordisplay• PCbasedconfigurationtool• SerialinterfacingtoPCS
Steam Turbine Control Application• Selectionoftwoorthreespeed probes• Automaticfallbackresponseto speedprobefailure
Predictive control response• Configurablesetpointand processvariable• Predictiveresponsetoavoid overspeeduponsuddendriven loadchanges
Open loop response• Increaseavailabilityand operabilityofthedrivenunit whichmayotherwisetripon overspeedduetosuddenload change• Actuatorcontrolresponse dampeninguponcompressor surgedetection
Actuator output• Linearizationofactuatoroutput• Valveactualpositiondeviation alarming(ifpositionfeedbackis available)
Sequencing• Fullautomaticcold,warmand hotstartofturbine• Automaticstartuptimingbased onrunningandshutdowntiming• Automaticwarmuptimingbased oncasingorflangetemperatures• Criticalspeedzoneramping andavoidance• Loadingandunloadingofa compressorinconjunctionwith itscompanionperformanceand antisurgecontrollers
Kabelweg37•1014BA•Amsterdam•TheNetherlandsT+31(0)206376801•F+31(0)206362780•www.control-care.com•[email protected]
Control solutions to the Oil & Gas, Chemical and Petrochemical industries world wideThe turbine governor control or Steam Turbine Control Application (STCA-GP) developed by Control-Care enables fully automated speed control during normal operation as well as start-up/shutdown speed control including critical speed avoidance. It provides a versatile and economical way to regulate your steam turbine’s speed, protects the turbine against overspeed damage and automatically sequences startups and shutdowns. The STCA is fully configurable to API611 general purpose steam turbines and is typically integrated into the train control system. This integration results in improved train control system availability and reliability as well as in reduced system cost.
TheentireControl-Careturbineandcompressorcontrolschemecanincludecompressorantisurge(ACA)andperformance(PCA)control,compressorauxiliariessequencing,parametricdiagnosticsandESDsysteminterfacing.
Set point mode selection• Internalsetpoint• Localsetpoint• Remotesetpoint• Cascadesetpoint• Analog,pushbuttons,seriallink
Limiting control• Maintainturbinespeedwithin allowableoperationalrange• Maintainpredefinedprocess variableswithinlimits
Cascade control• Controlofanalternateprocess variableusinganindependent setoftuningparameters
Overspeed prevention• Keepsteamturbinespeedator belowmaximumoperatingspeed usingpredictivecontrolresponseor openloopresponse
Overspeed and acceleration protection• Turbinetripwhentherotorspeedor accelerationexceedsallowablelimit
Calculated variables • Currentspeedindicationbasedon numberofinstalledprobesand functioningprobes
Graphical interfaces• Controlapplicationfaceplate• Controlapplicationconfigurator
User friendly application configurator• Upperscreenprovidesforloop configurationsettings• Lowerscreenshowsdedicated loop’scontributiontooverall output
Control valve testing module• Straightforwardcontrolvalve stroking• Straightforwardcontrolvalve strokeverificationtests• Passwordprotecteduser levelacces
Overspeed testing module• Simpleandautomated procedureforoverspeed validationandtesting,with manualoverridecapability• Passwordprotecteduser levelaccess
Kabelweg37•1014BA•Amsterdam•TheNetherlandsT+31(0)206376801•F+31(0)206362780•www.control-care.com•[email protected]
Control solutions to the Oil & Gas, Chemical and Petrochemical industries world wide
Turbine performance deviation alarming• Expectedandactual performancearecompared andalarmedincasediverging
Application control functions are selectable • Customizeeachapplication individuallybyenablingordisabling sitespecificfunctionality (configurationinsteadof programming)
Alarms and events • Timestampedalarmandevent reportingforsignalingand troubleshootingpurposes
Critical event stored on control system platform • Standardtrendingofcritical parameters,[x]minutes*prior and[y]minutes*aftertheevent
Sequence of event history on control system hardware, time stamped • Standard[x]points*history instandalonemode
*)Quantityisconfigurable
General Purpose Steam Turbine Control Application (STCA-GP)
for mechanical drives
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