IEEE Electrification Magazine - September 2013 - 49

Curtailment Points Will Keep the Fans Off
Engineering Building
E1.AH01.CURT
Curtailment
NONE
OFF

ME1SYS
Descriptor
Priority
Value N/A Units

ME1RET
Descriptor
Priority
Value N/A Units

E1.AH02.CURT
Curtailment
NONE
OFF

ME2SYS
Descriptor
Priority
Value N/A Units

ME2RET
Descriptor
Priority
Value N/A Units

E1.AH03.CURT
Curtailment
NONE
OFF

ME3SYS
Descriptor
Priority
Value N/A Units

E1.AH04.CURT
Curtailment
NONE
OFF
E1.AH05.CURT
Curtailment
NONE
OFF

Life Science Building

Stuart Building

LS.AH02.CURT
Curtailment
NONE
OFF

LS2SYS
Descriptor
Priority
Value N/A Units

SB.AH01.CURT
Curtailment
NONE
OFF

SB.AH01.SYS
SF South End
NONE
ON

LS.AH02.CURT
MEIRET
Curtailment
Descriptor
NONE
Status
OFF
Priority
Value
StateLS.AH03.CURT
Total Curtailment
NONE
OFF

LS3SYS
Descriptor
Priority
Value N/A Units

SB.AH02.CURT
Curtailment
NONE
OFF

SB.AH02.SYS
NORTH END
NONE
ON

LS4SYS
Descriptor
Priority
Value N/A Units

SB.AH03.CURT
Curtailment
NONE
OFF

SB.AH03.SYS
Basement
NONE
ON

ME4SYS
Descriptor
Priority
Value N/A Units

LS.AH06.CURT
Curtailment
NONE
OFF

LS6SYS
Descriptor
Priority
Value N/A Units

ME5SYS
Descriptor
Priority
Value N/A Units

LS.AH07.CURT
Curtailment
NONE
OFF

LS7SYS
Descriptor
Priority
Value N/A Units

LS.AH08.CURT
Curtailment
NONE
OFF

LS8SYS
Descriptor
Priority
Value N/A Units

Point:
Desc.:
Status:
Pri:
Value:
Ex-State:
Total:

Figure 15. The building controllers showing the status of controllable loads in three buildings in Loop 1 at IIT.

Figure 18, the DER dispatch P is at its rated value Prated at
the rated frequency frated , which are determined by the
master controller through tertiary control level. As the frequency increases, there will be a slight decrease in power
dispatch to compensate the frequency deviation. Similarly,
as the microgrid voltage increases, the injected reactive
power decreases to compensate the voltage drop. In -Figure
18(a) and (b), m p and m q , respectively, represent the slopes
of the f - P and v - Q curves. The DER units at the IIT
microgrid, which are equipped with primary and secondary control, are the natural-gas turbine synchronous generator and the battery storage unit.

the turbine and exciter, respectively, to regulate the real
and reactive power output and maintain the microgrid
frequency and voltage at the rated values. At steady state,
if the generator dispatch is deviated from the rated value
through primary droop control, the secondary control will
generate a nonzero adjustment signal shown in (1) to
restore the frequency or voltage back to the rated value.
Thus, the natural-gas turbine synchronous generator
would serve the campus load while maintaining the
microgrid frequency and voltage at the rated value.
	

~ 2nd = m p $ ^P - Prated h
V2nd = m q $ ^Q - Q rated h.	(1)

Natural-Gas Turbine Synchronous Generator
Figure 19 shows the control diagram for the natural-gas
turbine synchronous generator. Here, ~ , ~ rated , V , and
Vrated are the measured speed, rated speed, measured voltage, and rated voltage of the synchronous generator,
respectively; P, Prated , Q , and Q rated are the measured real
power, rated real power, measured reactive power, and
rated reactive power of the generator, respectively; ~ 2nd
and V2nd are the adjustment signals used for secondary
control. As shown in Figure 19, the natural-gas turbine
and exciter provide the input mechanical torque TM and
excitation to the generator. The primary and secondary
control modules for ~ - P and v - Q generate signals to

Battery Storage Unit
The control structure of the battery storage system is
shown in Figure 20, where the battery storage is connected to the microgrid through a bidirectional dc/ac inverter,
an ac filter, and a transformer. Here, the output real and
reactive power denoted by P and Q is calculated by
measuring the terminal voltage and current Vo and I o .
The measured real and reactive power are used in the
primary droop control to provide a reference voltage signal V *o . The voltage loop is used to stabilize the inverter
terminal voltage using the reference voltage signal and
to ensure that the DER output impedance is inductive at
	

IEEE Elec trific ation Magazine / s ep t em be r 2 0 1 3

49



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

IEEE Electrification Magazine - September 2013 - Cover1
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IEEE Electrification Magazine - September 2013 - Cover3
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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
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