Antonio Cammi, Roberto Ponciroli, Stefano Lorenzi, Sara Bortot, Alessandro Della Bona

Antonio Cammi, Roberto Ponciroli, Stefano Lorenzi, Sara Bortot, Alessandro Della Bona

Fabio Fineschi, Alessio Campedrer

LEADER WP4

Task 4.1 (task leader: Fabio Fineschi)

Task 4.4 (task leader: Antonio Cammi, [email protected])

“Preliminary definition of the Control Architecture”

ENEA BOLOGNA

26th October 2011

CIRTEN Consorzio universitario per la ricerca tecnologica nucleare

UNIVERSITA’ DI PISA

Antonio Cammi, Roberto Ponciroli, Stefano Lorenzi , Sara Bortot

OUTLINE

Point on the progress of the work

Reference system configuration and modeling

Significant free dynamics results

NON-LINEAR control system options

Main results

Present and future developments


POINT ON THE PROGRESS OF THE WORK

DYNAMICS SIMULATOR

DEVELOPMENT

NON-LINEAR

ZERO-DIMENSIONAL

NON-LINEAR

OBJECT-ORIENTED

LINEARIZED

ZERO-DIMENSIONAL

LINEARIZED

OBJECT-ORIENTED

TRANSIENT ANALYSES

LINEAR ANALYSIS

NEW!

CONTROL SYSTEM

DEVELOPMENT

• Evaluation of scenarios

• Final proposal• Implementation

TOOLS GOALS

CONTROLLED

PLANT TRANSIENT BEHAVIOR

NEW!

NEW!NEW!

NEW!

NEW!


POINT ON THE PROGRESS OF THE WORK

CAUSAL APPROACH ACAUSAL APPROACH

INPUT AND OUTPUT VARIABLES DETERMINED A PRIORI

NO INPUT AND OUTPUT VARIABLES NEITHER BOUNDARY CONDITIONS DETERMINED A PRIORI

EQUATIONS TO BE REWRITTEN FOR THE STATE-SPACE REPRESENTATION

CAUSALITY SPECIFIED ONLY WHEN SOLVING THE EQUATIONS

PROBLEM SOLVED STEP BY STEP BY THE USER COMPONENT MODELS INDEPENDENT OF OTHER MODELS AND BOUNDARY CONDITIONS

GREATER EFFORT REQUIRED FOR MODIFYING EXISTING MODELS

MORE REALISTIC DESCRIPTION OF COMPONENTS

DIFFICULTIES IN REUSING MODELS POSSIBILITY OF EASILY REUSING COMPONENT AND SUBSYSTEM MODELS


REFERENCE SYSTEM CONFIGURATION and MODELING

165 cm

529.89 cm

MAIN COMPONENTS: CORE


MAIN COMPONENTS: CORE

REACTIVITY COEFFICIENTS- Doppler from SCK calculations- Lead density from SCK calculations- Axial expansion from DEMO (missing data)- Radial expansion from DEMO (missing data)

KINETIC PARAMETERS- λi from DEMO (missing data)

- βi from DEMO (missing data)

CONTROL RODS WORTH- Insertion curves from DEMO (missing data)



REFERENCE SYSTEM CONFIGURATION

MAIN COMPONENTS: SG


PRIMARY LOOP



SECONDARY LOOP (BoP)



SECONDARY LOOP (BoP)

FINAL REFERENCE CONFIGURATION MISSING

STANDARD COMPONENTS EMPLOYED



SIGNIFICANT FREE DYNAMICS RESULTS

LEAD MASS FLOW RATE VARIATIONVARIATION = - 20 %

PowerT_cold_leg

T_hot_leg Pressure


SIGNIFICANT FREE DYNAMICS RESULTS

TURBINE ADMISSION VALVE COEFFICIENT VARIATIONVARIATION = - 10 %

Power

T_cold_leg

T_hot_leg Pressure


NON LINEAR CONTROL SYSTEM OPTIONS

VARIABLE LEAD MASS FLOW RATER1 =

E1 =

Output Efficienza

T_Steam 0.7904

T_fuel 0.5615

Pressione 0.9984

G_Steam 0.9993

T_cold_leg 0.9075

Power 0.8369

T_hot_leg 0.7353

RGAR1 =

T_S_in G_water h_rod G_Pb kv_turbine

T_Steam 0.4169 0.0082 0.1729 0.0274 -0.0006

T_fuel 0.0478 0.0003 0.2683 -0.0008 -0.0002

Pressione 0.0000 -0.0021 -0.0000 -0.0000 0.9989

G_Steam -0.0000 0.9986 -0.0000 -0.0000 -0.0000

T_cold_leg 0.1597 -0.0019 0.0741 0.5911 0.0007

Power 0.2757 -0.0007 0.4267 -0.0018 0.0004

T_hot_leg 0.1000 -0.0024 0.0581 0.3841 0.0009

E1 =



FIXED LEAD MASS FLOW RATE

T_S_in G_water h_rod kv_turbine T_Steam 0.3966 0.0080 0.2098 -0.0007

Pressione 0.0000 -0.0021 0.0000 0.9987

G_Steam -0.0000 0.9987 0.0000 -0.0000

T_cold_leg 0.1623 -0.0027 0.0586 0.0012

Power 0.3529 -0.0002 0.6407 0.0000

T_hot_leg 0.0881 -0.0018 0.0908 0.0008

E2 =

RGA

E2 =

Output Efficienza T_Steam 0.7834

Pressione 0.9983

G_Steam 0.9993

T_cold_leg 0.4685

Power 0.9968

T_hot_leg 0.4218



VARIABLE vs. FIXED LEAD MASS FLOW RATE

PROS & CONS

ADVANTAGES

- Better power control- Steady-state reached in a shorter time

DISADVANTAGES

- More difficulties in pairing process- Larger oscillations of controlled variables- Cold leg temperature to be controlled by feedwater temperature

strict UPPER and LOWER constraints




Feedforward-Feedback

PID Input OutputInput

Controllo

T_Pb_cold_leg

Power

Pressione

T_S_in

G_water

h_rod

kv _turbine

ALFRED

T_S_in

G_water

h_Rod

kv _turbine

T_Steam

Pressione

G_Steam

T_cold_leg

Power

T_hot_leg


kv_turbine

4

h_rod

3

G_water

2

T_S_in

1

Taratura

Power G_water

T_Pb_cold _leg _0

Pressione _0

Power _0

PI_5

PID

PI_3

PID

PID Anti -Windup

e usat

Add8

Add4

Add1

Pressione

3

Power

2

T_Pb_cold _leg

1





MAIN RESULTS

POWER LEVEL REDUCTION: - 10%


MAIN RESULTS



MAIN RESULTS



MAIN RESULTSFIXED LEAD MASS FLOW RATE


POWER LEVEL REDUCTION: - 200 MW


MAIN RESULTS



MAIN RESULTS



MAIN RESULTS

POWER LEVEL TRANSIENT: + 20 MW starting from f = 60%


MAIN RESULTS



MAIN RESULTS



PRESENT AND FUTURE DEVELOPMENTS

TIT CONTROL RGA

R3 =

T_S_in G_water h_rod G_att kv_turbine

T_Steam 2.0160 -2.0320 0.0297 0.9871 -0.0020

Pressione -0.0000 0.5476 0.0000 -0.5439 0.9963

G_Steam -0.0000 1.2836 0.0000 -0.2837 -0.0000

Power 0.2968 0.0366 0.6318 0.0271 0.0004

T_hot_leg -0.5613 0.4968 0.1950 0.3432 0.0030

T_cold_leg -0.7515 0.6674 0.1434 0.4703 0.0024

E3 =

Output Efficienza T_Steam 0.9994

Pressione 1.0000

G_Steam 0.9999

Power 0.9963

T_hot_leg 0.6904

T_cold_leg 0.7294


PRESENT AND FUTURE DEVELOPMENTS

OPEN ISSUES

Update with final core configuration DATA NEEDED!

Closing the secondary loop DATA NEEDED!

- ELSY BoP data employed provisionally

- Data concerning bleeds, heaters, …

- Detailed and complete configuration

Development of ADVANCED CONTROL:

- Variable Structure Control (VSC)

- Predictive control


D14 : Normal, Transient and Accidental Operational Modes: Control and Protection Functions Identification

3rd Draft Issued

D21: Preliminary Definition of the Control Architecture

1st Draft – Chapter I issued

DOCUMENT RELEASE

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Antonio Cammi, Roberto Ponciroli, Stefano Lorenzi, Sara Bortot, Alessandro Della Bona