IEEE Electrification Magazine - September 2013 - 52

P
(ωrated)

+

P-ω
Primary

+
+ ω
2nd

Gas
Turbine

−

P-ω
Secondary

TM

Sync.
Gen.
V

ω

Exciter

Q
Q-V
V2nd Secondary

Vrated

Prated

+

Q-V
Primary

Qrated

Tertiary
Control

+

Figure 19. The natural-gas turbine synchronous generator control module.

signals when the price of electricity is high, which would
lower the cost of supplying the campus load. Here, the
building load is shifted from peak hours 16-18 to off-peak
hours 4-6. The set points shown in Figure 22 are sent to
DER units and building controllers to set the campus load
and generation. The local microgrid generation is also
used to supply the peak demand at the utility grid.
Accordingly, the daily energy cost of the microgrid is
reduced from US$15,524 to US$13,715. Figure 23 shows the
economical load reduction at IIT on 19 August 2010, which

Inverter

was recorded by ComEd. Here, the campus load is reduced
by 60% through curtailing building loads, shifting campus
loads, and dispatching the natural-gas turbine at IIT.

Short-Term Reliability
The IIT microgrid connects to the utility grid through
four 12.47-kV feeders located at the North and South
Substations. The IIT microgrid can operate in both gridconnected and island (autonomous) modes. In the grid--
connected mode, the microgrid frequency and voltage

Microgrid

ac Filter

PWM
Ic
Current
Loop

Vo
Voltage
Loop

Vo
∗

Vo

Primary
Control

P, Q

Biloop
Prated, Qrated

Tertiary
Control

Figure 20. The control structure of the battery storage system.

52

I E E E E l e c t r i f i c atio n Magaz ine / september 2013

f2nd, V2nd
Secondary
Control
fMG, VMG

Io

Power
Calculation



Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2013

IEEE Electrification Magazine - September 2013 - Cover1
IEEE Electrification Magazine - September 2013 - Cover2
IEEE Electrification Magazine - September 2013 - 1
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IEEE Electrification Magazine - September 2013 - Cover3
IEEE Electrification Magazine - September 2013 - Cover4
https://www.nxtbook.com/nxtbooks/pes/electrification_december2022
https://www.nxtbook.com/nxtbooks/pes/electrification_september2022
https://www.nxtbook.com/nxtbooks/pes/electrification_june2022
https://www.nxtbook.com/nxtbooks/pes/electrification_march2022
https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
https://www.nxtbook.com/nxtbooks/pes/electrification_september2021
https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
https://www.nxtbook.com/nxtbooks/pes/electrification_march2021
https://www.nxtbook.com/nxtbooks/pes/electrification_december2020
https://www.nxtbook.com/nxtbooks/pes/electrification_september2020
https://www.nxtbook.com/nxtbooks/pes/electrification_june2020
https://www.nxtbook.com/nxtbooks/pes/electrification_march2020
https://www.nxtbook.com/nxtbooks/pes/electrification_december2019
https://www.nxtbook.com/nxtbooks/pes/electrification_september2019
https://www.nxtbook.com/nxtbooks/pes/electrification_june2019
https://www.nxtbook.com/nxtbooks/pes/electrification_march2019
https://www.nxtbook.com/nxtbooks/pes/electrification_december2018
https://www.nxtbook.com/nxtbooks/pes/electrification_september2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2018
https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2017
https://www.nxtbook.com/nxtbooks/pes/electrification_june2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2016
https://www.nxtbook.com/nxtbooks/pes/electrification_september2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2016
https://www.nxtbook.com/nxtbooks/pes/electrification_march2015
https://www.nxtbook.com/nxtbooks/pes/electrification_june2015
https://www.nxtbook.com/nxtbooks/pes/electrification_september2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2014
https://www.nxtbook.com/nxtbooks/pes/electrification_june2014
https://www.nxtbook.com/nxtbooks/pes/electrification_september2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2013
https://www.nxtbook.com/nxtbooks/pes/electrification_september2013
https://www.nxtbookmedia.com