A Novel Grid-forming Voltage Control Strategy for Supplying Unbalanced Microgrid Loads Using Inverter-based Resources

Xu, Bei; Paduani, Victor; Yu, Hui; Lubkeman, David; Lu, Ning

doi:10.1109/pesgm48719.2022.9916707

A Novel Grid-forming Voltage Control Strategy for Supplying Unbalanced Microgrid Loads Using Inverter-based Resources

Conference · 17 July 2022 · 2022 IEEE Power & Energy Society General Meeting (PESGM)

DOI:https://doi.org/10.1109/pesgm48719.2022.9916707· OSTI ID:2329514

Xu, Bei ^[1]; Paduani, Victor ^[2]; Yu, Hui ^[2]; Lubkeman, David ^[2]; Lu, Ning ^[2]

FREEDM Systems Center, North Carolina State University,Department of Electrical and Computer Engineering,Raleigh,NC; North Carolina State University
FREEDM Systems Center, North Carolina State University,Department of Electrical and Computer Engineering,Raleigh,NC

This paper presents a novel grid-forming voltage control strategy for a battery energy storage system to maintain balanced three-phase output voltages when serving unbalanced loads. A stationary reference frame (αβ) based control scheme is proposed to regulate positive-sequence and negative-sequence voltages. Compared with the conventional rotating reference frame (dq) based control scheme, the proposed scheme shows better dynamic performance. Then, we analyze the system zero-sequence network and propose adding a grounding transformer to the Y/Yg connected output transformer to further reduce the voltage unbalance at the point of common coupling. The simulation results demonstrate the effective performance of the proposed voltage control scheme. Based on the results, the power-voltage unbalance curve is derived for different output transformer configurations to establish the relationship between the power unbalance limit and the voltage unbalance limit for microgrid power scheduling.

Research Organization:: North Carolina State University

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), SETO

DOE Contract Number:: EE0008770

OSTI ID:: 2329514

Journal Information:: 2022 IEEE Power & Energy Society General Meeting (PESGM), Journal Name: 2022 IEEE Power & Energy Society General Meeting (PESGM)

Country of Publication:: United States

Language:: English

References (12)

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