Faster turbine start-up ensures minutes
reserve capability in Berlin-Wilmersdorf
cogeneration power plant
Turbine Controls Reference
Instrumentation, Controls & Electrical
SPPA-R3000 Turbine Controls
is a perfect solution for gas and steam turbines
from all producers, with electrical solutions,
process engineering, comprehensive automation functions and a modern state-of-the-art
I&C system fully-integrated into the unit control.
The Result
■ Availability of required
power output at preselected time due to shorter
turbine start-up
(from 22.5 to 7.5 min.)
■ New control system
ensures excellent
operation of GE turbines
■ Reliable and safe highperformance system for
optimum use of remaining
lifetime of 'old' machines
The Plant
The Wilmersdorf cogeneration power plant,
owned by VATTENFALL AG, went into commercial operation in the 1970s and is equipped with
three GE MS9001B (Frame9B) gas turbines with
a GE Mark II control system. The gas turbines
which originally where operated to exhaust to
heat exchangers for district heating are used
today as standby machines to provide minutes
reserve capacity under remote control from
a different site.
The Task
Reasons for the modernization project were
high spare parts cost, an increasing failure
rate, and inadequate fault analysis capability.
Central requirement was to reduce turbine
start-up from a standstill to export of gas
turbine base load to the grid (rated electrical
power output of 83 MW) from 22.5 to
7.5 minutes.
A challenge were the technological changes
to the start-up and loading process with due
consideration of design limits, life expenditure
and the heat exchanger purging concept in
the event of failed ignition attempts that was
subject to approval by the technical inspection
agency.
Our Solution
The previous control system was replaced by
SPPA-R3000. A new digital paralleling unit
ensures fault-free synchronization with the grid.
To meet the stringent requirements for control
quality and reliability, all speed sensors and
analog position sensors from the field devices
were replaced by new sensors.
Following modernization, digital control with
electrical actuators is now implemented for
the unreliable capillary drives on the cooling
system. The new start-up concept minimizes
thermal loadings during the start-up phase and
simultaneously minimizes the resulting rotor
acceleration. This has a demonstrated positive
impact on ignition reliability under cold and
damp weather conditions.
After synchronization, new algorithms continually calculate the ideal loading gradients while
simultaneously minimizing mechanical and
thermal loadings on the machine.
“We have seen significantly
reduced start-up times of gas
turbines, allowing us to react
flexibly to grid demands and
to quickly offer power to the
load dispatcher.”
Manfred Froehlich, Head of Operations CHP Wilmersdorf,
Vattenfall Europe Wärme AG
Answers for energy.
Published by and copyright © 2012:
Siemens AG, Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
For more information contact
sppa-r3000.energy@siemens.com
www.siemens.com/energy/sppa-r3000
Siemens Energy, Inc.
Instrumentation, Controls, & Electrical
1345 Ridgeland Parkway, Suite 116
Alpharetta, GA 30004, USA
Customer Support Center
Tel.: +49 180 524 70 00
Fax: +49 180 524 24 71
(Charges depending on provider)
E-mail: support.energy@siemens.com
R3C_FR_Wilmerstdorf_e_V2-0
Order no. E50001-G230-A282-X-4A00
Printed in Germany
Dispo 05401, c4bs-Nr. 7465
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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.