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Office
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In Layperson’s Terms: This, is Droop Control
THE GAS TURBINE BEHAVIOR
Presented at GTUF 2016
November 24 – Brisbane, Australia
GTC Speaker
Abel Rochwarger - Chief Engineer
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Slides 4 – 11
Slides 12 – 31
GTC Background
Droop Control
Our Next 30’ or so…
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Slides 32 GTC Contact
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Since 2001, GTC is growing internationally, providing
consistent high quality parts and services.
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Introduction
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“What does it mean the unit is in Droop Control?”
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Introduction
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“What does it mean the unit is in Droop Control?”
“All the generators in Droop Control collaborate by
picking up or shedding load as needed to maintain the
grid’s frequency.”
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Objectives
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This short discussion, in layperson’s terms for those
somewhat familiar with gas turbine operations, will try to:
• explain the concept of droop control
• derive some consequences (Preselected Load)
• provide an exercise and example
• explain isochronous control with a simplified model
Considering:
industrial type gas turbine for power generation (6B or 7EA)
a constant droop setting
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Min. Value Gate
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MVG example
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Base Load
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More Base Load
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Question
Given a unit at a specific location, is Base Load
a unique value?
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More Base Load
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So?
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Question (rhetoric)
Are we any closer to an explanation of “Droop
Control”?
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Droop Control
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Question
When is a gas turbine in “Droop Control”?
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Droop Control
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Question
When is a gas turbine in “Droop Control”?
For the unit to be in “Droop Control” there are two conditions:
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Droop Control
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Question
When is a gas turbine in “Droop Control”?
For the unit to be in “Droop Control” there are two conditions:
The unit is in “Speed Control”, i.e. below “Base Load”.
(Now we know that when in Speed Control FN < FT and TX < TR)
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Droop Control
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Question
When is a gas turbine in “Droop Control”?
For the unit to be in “Droop Control” there are two conditions:
The unit is in “Speed Control”, i.e. below “Base Load”.
(Now we know that when in Speed Control FN < FT and TX < TR)
There is no “Preselected Load” function active. In other
words, the unit is “floating” responding to the frequency of the
grid.
THIS IS VERY IMPORTANT.
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In with the NEW
Speed and Power
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Consequences
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“Preselected Load vs. Droop: The Curse of the Deadband”
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Consequences
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“Preselected Load vs. Droop: The Curse of the Deadband”
(not another “Band of Zombies” story)
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Preselect vs. Droop
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Exercise
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Review
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Simplified concepts involved in Primary Frequency Regulation
For Preselected Load mode, we covered
(a) What happens in case of a frequency change
(b) What the limits are for “true droop response” (Exercise)
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Isochronous
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Finally
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This completes the promised scope.
If you made it this far, we thank you for your
time and patience.
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GTC Contact
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Sales Services Engineering
Name Gennaro Pipoli Sam Leyton Abel Rochwarger
Title VP - Asia Service Manager Chief Engineer
Email gpipoli@** sleyton@** abel@**
Skype gtc-gpipoli gtc-sleyton gtc-arochwarger
Phone +1 914 314 8212 +1 914 689 4312 +1 914 299 2684
Location Singapore USA Argentina
@**: @gasturbinecontrols.com