Transcript Thermoflow DRS

Thermoflow, Inc.
WHAT IS DRS?
Thermoflow’s Data Reconciliation System is abbreviated as DRS. The DRS runs from
within MS Excel and reconciles a Thermoflow plant model with a set of measured or
expected data.
Use the DRS to analyze plant performance test data using a model that follows the laws of
physics to ensure closed energy and mass balances.
Use the DRS for on-line plant performance monitoring. Verify key plant measurements such
as fuel flow, generator power output, key system pressures, temperatures, and mass flows.
Data Reconciliation System (DRS)
Base Case
You create the DRS Base Case in any of Thermoflow’s main programs, GT PRO, STEAM
PRO, GT MASTER, STEAM MASTER, or THERMOFLEX.
The underlying model provides the framework for reconciliation. The measurements or expected
data are compared with model outputs. DRS makes reasonable adjustments to model parameters
to find the best-fit between measured data and model predictions.
Data Reconciliation System (DRS)
New DRS Workbook
Thermoflow-DRS menu
in Excel gives access to all
functions.
You begin by loading an
existing file created with
any of Thermoflow’s core
programs.
Data Reconciliation System (DRS)
Model Inputs
Model inputs are used in two
ways. Some inputs are treated
as given, for example site
ambient temperature. This value
is fixed from the data.
Others are adjusted by DRS to
reduce the difference between
model output and measured data,
for example component
efficiencies, fuel flows, or model
assumptions.
Virtually any core program
input can be set from within
Excel.
Inputs are listed in a tree
structure that follows the
menu structure in the core
program.
Data Reconciliation System (DRS)
Model Outputs
Primary use of model outputs is comparison
with measured quantities. For example,
computed generator power is compared with
its measured counterpart as a measure of
how close the model output is to measured
data set.
Unmeasured heat balance pressures,
temperatures, and flows whose values are desired
at the measured condition are often
used to “fill-in-the-blanks”, that is round out
the set of data at a measured condition.
Data Reconciliation System (DRS)
Main Worksheet
Measured data are
entered manually in off
-line use, or populated
by a bridge program in
on-line operation.
Each reconciled value
has its own weighting
factor, filter margin, and
accuracy limit. Sensor
health reports categorize
measurement health in
bottom-line fashion as
LOW, MEDIUM, or HIGH.
DRS output is color-coded
for easy interpretation,
and all values are available
for detailed analysis.
Data Reconciliation System (DRS)
Calculation
DRS runs the calculation
engine for the core program
from Excel. It manages all
input and outputs for you
and provides the result back
in Excel upon convergence.
DRS computes adjustments to
model input parameters that
minimize the weighted difference
between measured values and
computed results. User-specified
weights bias the result towards
more reliable measurements,
and away from less accurate data.
Data Reconciliation System (DRS)
Sensor Health Summary
Table
Sensor Health Summary
table provides overview
of sensor health, followed
by detailed breakdown of
each measurement and
how it differs from the
model.
PURPLE entries were
disqualified because the
raw measurement was
way off.
RED means the
measurement has LOW
health because it is far
from the model result.
YELLOW indicates
MEDIUM, and GREEN
indicates HIGH health measurement and model
agree well.
Data Reconciliation System (DRS)
Sensor Health Summary
Chart
Graphical display by
sensor health category.
Percentage overview
quickly summarizes
state of plant
instrumentation health.
Data Reconciliation System (DRS)
Sensor Health Breakdown
Sensor health breakdown shows sensor-by-sensor condition
on a relative basis.
Sensor-specific health margins make it easy to tune the DRS
so less important measurements can have relatively large
errors without generating alarms, while more significant values
like power and fuel flow use tighter limits to ensure problems
are found early.
Data Reconciliation System (DRS)
Flexible DRS GUI
Like ELINK, the DRS can have a flexible GUI
so even user’s who don’t know the model
can use and benefit from the software.
This DRS GUI is used for data input and output. Measurements
go into the light green boxes, where color-coded reconciled
results are updated just below.