G3520C/EHigh Efficiency Gas Generator Setfor Island Mode Operation

Updated: February 2008

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What is “Island Mode” Operation?

• Two types of operation modes for on-site generator sets in terms of utility grid connection– Parallel With Utility

Applications like Base Load, Peak Shaving & Peak Sharing– Non-Parallel With Utility

Applications of any stand-alone power generation system. The unit(s) can be used in place of the utility grid, or operated when the utility grid is down, such as a standby unit(s).

• Island Mode Operation as defined by Caterpillar is any Gas Generator Set operation that is not paralleled to a public utility. (Refer to Product Update: G3500C Island Mode Transient Performance LEXE7567-02)

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What do the benefits of the Island Mode feature mea n to customers?

• The Island Mode feature tackles the major barriers for Distributed Generation (DG) in stand alone applications where: – no connection with a utility grid – the grid does not provide quality power

• Improved transient capability leading to more low emission gas generator sets being used in standby power applications.

• More options for customers to adopt clean energy to their electric power solutions.

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Improvements of G3520C for Island Mode Operation

• Air System Improvements– Turbocharger match optimized for

steady state stability and transient response

– Turbocharger management system developed to optimize compressor operating points during steady state and transient operation and minimize sensitivity to ambient conditions.

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Improvements of G3520C for Island Mode Operation

• Enhanced Control System– ADEM3 based engine control system– High speed engine sensors for key control parameters– Optimized fueling strategy for engine stability and response

ADEM3

Island Mode

Control System

High speed engine sensors

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Benefits of the G3520C with the Island Mode operati on feature

• Transient State– Minimize the voltage dip or surge, frequency dip or surge, and

recovery time during block loading or block unloading.• Steady State

– Maintain tight voltage and frequency deviations during minimal load fluctuation

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Single-Step Load Pick-Up Capability to Maintain G1

0

5

10

15

20

25

30

0 10 20 30 40 50 60 70 80 90 100

Percent of Site Rated Load Before Single Load Step

Allo

wab

le S

ingl

e Lo

ad S

tep

Note: Recommend a minimum of 30 secondsbetween load steps for load increases more than 5%, depending upon fuel characteristics and emissions requirements. Transient performance requires a warm engine with jacket water temp >70°C (158°F).

With Island Mode Application Feature

Without Island Mode Application Feature

G3520C 1800 rpm / G3520C 1500 rpm

Competitor

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56

57

58

59

60

61

62

0 5

Time (seconds)

Cus

tom

ary

/ Usu

al F

requ

ency

D

evia

tion

Ran

ge (H

Z)

Steady State Capability Comparison

With Island Mode Application Feature

Without Island Mode Application Feature

G3520C 1800 rpm / G3520C 1500 rpm

Note: Steady state is defined as less than or equal to1.5% load fluctuation over 60 seconds. Load fluctuations larger than 1.5% are not considered steady state.

Freq Voltagew/o IM feature +/- 1.5 HZ +/- 5 Vw/ IM feature +/- 0.6 HZ +/- 4.8 V

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Summary

• A high electrical efficiency and low emission gas package genset withIsland Mode operation feature is now available.

• A larger single-step block loading capability for each loading step is nowavailable.

• Refer to the following document for detailed information Product Update -- G3500C Island Mode Transient Perfo rmanceMedia #: LEXE7567-02