abel rochwarger - gas turbine controls corporation

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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


Since 2001, GTC is growing internationally, providing

consistent high quality parts and services.


Introduction

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“What does it mean the unit is in Droop Control?”


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.”


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


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?


More Base Load

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So?

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Question (rhetoric)

Are we any closer to an explanation of “Droop

Control”?


Droop Control

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Question

When is a gas turbine in “Droop Control”?


Droop Control

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Question


For the unit to be in “Droop Control” there are two conditions:


Droop Control

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Question



The unit is in “Speed Control”, i.e. below “Base Load”.

(Now we know that when in Speed Control FN < FT and TX < TR)


Droop Control

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Question



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.


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”


Consequences

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“Preselected Load vs. Droop: The Curse of the Deadband”

(not another “Band of Zombies” story)


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)


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.


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