PSS®E
Optimal Power Flow
At a glance
®
PSS E OPF (Power System Simulator for Engineering Optimal Power Flow) from Siemens
Power Technologies International (Siemens
PTI), the provider of network consulting, software solutions and T&D training in the Siemens
Energy Sector, is a powerful and easy-to-use
electric network analysis tool. It goes beyond
traditional load flow analysis to provide you with
the ability to fully optimize and refine your
transmission system. This task is made even
easier with the complete integration of the OPF
®
into the PSS E Power Flow program.
PSS®E OPF improves the efficiency and
throughput of your power system performance
studies by adding intelligence to the load flow
solution process. Whereas the conventional
load flow relies on the engineer to systematically investigate a variety of solutions before
®
arriving at a satisfactory “good” solution, PSS E
OPF automatically adjusts controls to determine
the “best” solution. From virtually any reasonable starting point, you are assured that a
unique global optimal solution is attained, a
solution that simultaneously satisfies system
constraints given a pre-determined objective.
„ Location based marginal cost assessment
„ Ancillary service opportunity cost assessment
„ Impact assessment
„ Base case development
„ Congestion analysis
Our solution
®
PSS E OPF provides you with an easy-to-use
interface that has been specifically designed to
assist you in quickly defining and building even
the most complex power system optimization
problems. By being fully integrated into the
®
®
PSS E Power Flow program, PSS E OPF obtains all of the necessary load flow data models
®
directly from PSS E and automatically updates
them each time an optimal power flow solution
process is completed. Spreadsheets provide a
convenient way to introduce, modify and view
all optimal power flow constraints and control
variables. A complete set of windows offers a
modern graphical user interface in which to
operate the entire program. Every function is
directly accessible through pull-down menus.
The challenge
In addition to being able to perform traditional
analysis such as minimizing operating costs,
PSS®E OPF is ideally suited to solving many
problems more attuned to the challenges of
today's less-regulated power system environment:
„ Reactive power scheduling
„ Voltage collapse analysis
„ Transfer capability investigation
Siemens PTI − Software Solutions
Figure1: PSS®E OPF Solution Dialog
Application example
®
PSS E OPF provides you with the most
commonly desired objective functions,
and more:
„ Minimize fuel costs
„ Minimize active power slack generation
®
PSS E OPF allows you to easily combine any of these objective functions at
the push of a button. The optimal power
flow problem statement is completed by
combining the objective with any number
of constraints and controls, selectable
from the following:
„ Bus voltage magnitude limits
„ Minimize reactive power slack generation
„ Branch flow limits (MW, Mvar, MVA,
Ampere)
„ Minimize active power losses
„ Interface flow limits (MW, Mvar)
„ Minimize reactive power losses
„ Minimize adjustable branch reactance
„ Generator reactive power capability
limits
„ Minimize adjustable bus shunts
„ Generation period reserve limits
„ Minimize or maximize interface flows
„ Generator active power limits
„ Minimize or maximize active power
transfers
„ Adjustable bus shunt limits
„ Minimize or maximize reactive generation reserve
„ Adjustable load limits
„ Minimize load adjustments
„ Adjustable branch reactance limits
The speed and robustness of the program makes it suitable not only for network planning and analysis problems,
but also for operational planning environments.
Figure 2: PSS®E OPF data tables dialog
Published by and copyright © 2009:
Siemens Energy, Inc.
Power Distribution, T&D Service Solutions
Siemens Power Technologies International
400 State Street
PO Box 1058
Schenectady, NY 12301-1058
www.siemens.com/energy/power-technologies
Siemens AG
Energy Sector
E D SE PTI
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens Transmission and Distribution Ltd
PTI
Sir William Siemens House, Princess Road
Manchester, M20 2UR
United Kingdom
For more information, please contact
our Customer Support Center.
Phone: +49 180 524 70 00
Fax:
+49 180 524 24 71
(Charges depending on provider)
E-mail: support.energy@siemens.com
Power Distribution Division
Printed in Germany
Printed on elementary chlorine-free
bleached paper.
All rights reserved.
Trademarks mentioned in this document
are the property of Siemens AG, its affiliates,
or their respective owners.
Subject to change without prior notice.
The information in this document contains general
descriptions of the technical options available,
which may not apply in all cases.
The required technical options should therefore be
specified in the contract.
SWPE07-EN-200905