Objectives:
Backgrounds:
Proposed Solution:
PotentialImpact:
0.1PU
MTC
0.20.3
0.40.5
MTC Rating
Active Mobile SubstationsBabak Parkhideh, Nima Yousefpoor and Subhashish Bhattacharya
North Carolina State University
Disasters and Emergencies Management Acceleration of Renewable Integration Creating more Efficient Market Transmission investment Deferral Reducing the Costs of Serving Loads
Transformer (partial)Back-up is Needed Average age of US Transformers is 40 years Transformers can have more than 3 years
manufacturing lead time Transmission transformers are no more 99.999%
reliable
Power Flow Controller/Router for Intermittent Renewable Generations is Needed
Active mobile substations Accelerate renewable integration Leverage different R&D programs on advanced high
voltage devices and medium frequency magnetics
Vs Vr
Power System
50%
50%
1p.u. power
Similar TransformersPassive
Solution
Unified Modular Transformer Converter SystemVP1
VP2
VPn
VS1
VS2
VSm
Switch Network
SELECTED REFERENCES1. http://www.eia.doe.gov/cneaf/electricity/page/disturb_events_archive.html.2. K. H. LaCommare, and J. Eto, “Cost of power interruptions to electricity consumers in the United States,” LBNLreport-58164, 2006.3. D. Woodcock, “Transformer fleet health and risk management,” IEEE PES Transformer Committee Tutorial, 2007.4. http://www.nerc.com/filez/tadswg.html 2008-09 & RMWG 2011.5. E. Muljadi, “New challenges in high penetration wind power generation,” NREL, 2010.6. B. Parkhideh, and S. Bhattacharya, “Active power transfer capability of FACTS devices based on angle control,”IEEE ECCE’09.7. H. Mirzaee et. al, “Design Comparison of High Power Medium-Voltage Converters based on 6.5kV Si-IGBT/Si-PiN JBS diode, and 10kV SiC MOSFET/SiC-JBS diode“ presented at IEEE ECCE 2011.
IEEE 30 Bus Test System
Desired Flexible Frame for the Transmission Controller
Normal Conditions• Power Router• Trafo Life Extender
Midwest Region
Low Availability
~$14B Assets
Seasonal Changeof RenewablesUnderutilization Assets
Vs Vr
Power System
G
G
r r
C
r
C
1415 18
19
1620
1710
2122
2423
r
3029
27 28
2526
1
2
3
4
12
5
7
9
13
8
C11
MTC-CSTC
Distributed Control Mode
MTC-CSTC MTC-CSTC
G
G
r r
C
r
C
1415 18
19
1620
1710
2122
2423
r
30 29
27 28
2526
1
2
3
4
12
5
7
9
13
8
C11
Distributed & Centralized
Control Mode
MTC-CSTC
MTC-CSTC
MTC-CSTC
Towards fractionally rated solution!
Contingency Relief Strategy
0 0.05 0.1 0.15 0.20.7
0.8
0.9
1
1.1
Time(s)
DC
Vol
tage
(P
U)
90% 1PH Voltage Sag in Hybrid Power System Applications- Transformer Back-up
ProposedController
CommonController
Several Testbeds at FREEDM to Develop MTC
ABB
MTC a fractional rated solution!MTC Topologies-Efficiency vs. semiconductor vs, control Controller Development under Normal and Fault Conditions
0
0.2
0.4
0.6
0.8
1
1.2
0 0.2 0.4 0.6
Transformer Power Flow (PU)
P_trafo
Q_trafo
Power FlowControl
-1.25
-0.75
-0.25
0.25
0.75
1.25
24-Pulse Converter Voltages at the Interfacing Trafo (PU)
