Dynamic Microgrids With Self-Organized Grid-Forming Inverters in Unbalanced Distribution Feeders

Journal Article · Wed Aug 21 00:00:00 EDT 2019 · IEEE Journal of Emerging and Selected Topics in Power Electronics

DOI:https://doi.org/10.1109/jestpe.2019.2936741· OSTI ID:1567173

Du, Yuhua  ^[1]; Lu, Xiaonan  ^[2]; Tu, Hao  ^[1]; Wang, Jianhui ^[3]; Lukic, Srdjan  ^[1]

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1. North Carolina State Univ., Raleigh, NC (United States)
2. Temple Univ., Philadelphia, PA (United States)
3. Southern Methodist Univ., Dallas, TX (United States)

In contrast to conventional static microgrids (MGs), MGs with dynamic and adjustable territories (i.e., dynamic MGs) are proposed and implemented in this paper. Dynamic MGs are commonly dominated by grid-forming inverters and nested in unbalanced distribution feeders. Unlike balanced systems where only positive-sequence components exist, proper operation of unbalanced dynamic MGs presents additional challenges. A distributed secondary control strategy is developed in this study for distributed generators (DGs) interfaced with gridforming inverters in unbalanced dynamic MGs by providing coordinated regulations on both positive- and negative-sequence system models. System frequency and voltage are under constant regulation, along with voltage unbalance (VU) management for multiple critical load buses (CLB). The proposed control strategy enables seamless system transition during unbalanced dynamic MGs reconfiguration, and guarantees proportional positive- and negative-sequence power sharing among connected DGs with respect to system topology variation. Detailed controller designs are provided and stability analyses are derived. The proposed control strategy is fully implemented in hardware controllers and validated on a Hardware-in-the-Loop (HIL) MG testbed.

• Research Organization: Vanderbilt Univ., Nashville, TN (United States)
• Sponsoring Organization: USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
• Grant/Contract Number: AR0000666; 34230
• OSTI ID: 1567173
• Report Number(s): DOE-VANDERBILT-0000666-29
• Journal Information: IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 8, Issue 2; ISSN 2168-6777
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
42 ENGINEERING
distributed control
dynamic microgrids
network reconfiguration
secondary control
unbalanced system
RIAPS