Low-Frequency Stability Analysis of Inverter-Based Islanded Multiple-Bus AC Microgrids Based on Terminal Characteristics

Cao, Wenchao; Ma, Yiwei; Wang, Fei; Tolbert, Leon M.; Xue, Yaosuo

doi:10.1109/tsg.2020.2978250

Title: Low-Frequency Stability Analysis of Inverter-Based Islanded Multiple-Bus AC Microgrids Based on Terminal Characteristics

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Abstract

For system planning of three-phase inverter-based islanded ac microgrids, the low frequency instability issue caused by interactions of inverter droop controllers is a major concern. When internal control information of procured commercial inverters is unknown, impedance-based small-signal stability criteria facilitate prediction of resonances in medium and high frequency ranges, but they usually assume the grid fundamental frequency as constant and thus they are incapable of analyzing the low-frequency oscillation of the fundamental frequency in islanded microgrids. Aiming at solving this issue, this paper proposes two stability analysis methods based on terminal characteristics of inverters and passive connection network including the dynamics of the fundamental frequency for analysis of low-frequency stability in islanded multiple-bus microgrids. Based on the Component Connection Method (CCM) to systematically separate inverters from the passive connection network, a general approach is developed to model the microgrid as a multiple-input-multiple-output (MIMO) negative feedback system in the common system d-q reference frame. By applying the generalized Nyquist stability criterion (GNC) to the return-ratio and return-difference matrices of the MIMO system model, the low-frequency stability related to the fundamental frequency can be analyzed using the measured terminal characteristics of inverters. Finally, analysis and simulation of a 37-bus microgrid verify themore »« less

Authors:

^[1];

^[2]; Wang, Fei ^[2];

^[3];

^[3]

Danfoss LLC, Tallahassee, FL (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Tue Sep 01 00:00:00 EDT 2020

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Electricity (OE)

OSTI Identifier:: 1648986

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Smart Grid

Additional Journal Information:: Journal Volume: 11; Journal Issue: 5; Journal ID: ISSN 1949-3053

Publisher:: IEEE

Country of Publication:: United States

Language:: English

Subject:: 24 POWER TRANSMISSION AND DISTRIBUTION; AC microgruids; droop control; impedance; inverters; small-signal stability; terminal characteristics

Citation Formats


                    Cao, Wenchao, Ma, Yiwei, Wang, Fei, Tolbert, Leon M., and Xue, Yaosuo. Low-Frequency Stability Analysis of Inverter-Based Islanded Multiple-Bus AC Microgrids Based on Terminal Characteristics.  United States: N. p., 2020. 
Web.  doi:10.1109/tsg.2020.2978250.

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                    Cao, Wenchao, Ma, Yiwei, Wang, Fei, Tolbert, Leon M., & Xue, Yaosuo. Low-Frequency Stability Analysis of Inverter-Based Islanded Multiple-Bus AC Microgrids Based on Terminal Characteristics.  United States.  https://doi.org/10.1109/tsg.2020.2978250

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                    Cao, Wenchao, Ma, Yiwei, Wang, Fei, Tolbert, Leon M., and Xue, Yaosuo. Tue .  
"Low-Frequency Stability Analysis of Inverter-Based Islanded Multiple-Bus AC Microgrids Based on Terminal Characteristics".  United States.  https://doi.org/10.1109/tsg.2020.2978250.  https://www.osti.gov/servlets/purl/1648986.

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@article{osti_1648986,

  title        = {Low-Frequency Stability Analysis of Inverter-Based Islanded Multiple-Bus AC Microgrids Based on Terminal Characteristics},

  author       = {Cao, Wenchao and Ma, Yiwei and Wang, Fei and Tolbert, Leon M. and Xue, Yaosuo},

  abstractNote = {For system planning of three-phase inverter-based islanded ac microgrids, the low frequency instability issue caused by interactions of inverter droop controllers is a major concern. When internal control information of procured commercial inverters is unknown, impedance-based small-signal stability criteria facilitate prediction of resonances in medium and high frequency ranges, but they usually assume the grid fundamental frequency as constant and thus they are incapable of analyzing the low-frequency oscillation of the fundamental frequency in islanded microgrids. Aiming at solving this issue, this paper proposes two stability analysis methods based on terminal characteristics of inverters and passive connection network including the dynamics of the fundamental frequency for analysis of low-frequency stability in islanded multiple-bus microgrids. Based on the Component Connection Method (CCM) to systematically separate inverters from the passive connection network, a general approach is developed to model the microgrid as a multiple-input-multiple-output (MIMO) negative feedback system in the common system d-q reference frame. By applying the generalized Nyquist stability criterion (GNC) to the return-ratio and return-difference matrices of the MIMO system model, the low-frequency stability related to the fundamental frequency can be analyzed using the measured terminal characteristics of inverters. Finally, analysis and simulation of a 37-bus microgrid verify the effectiveness of the proposed stability analysis methods.},

  doi          = {10.1109/tsg.2020.2978250},

  journal      = {IEEE Transactions on Smart Grid},

  number       = 5,

  volume       = 11,

  place        = {United States},

  year         = {Tue Sep 01 00:00:00 EDT 2020},

  month        = {Tue Sep 01 00:00:00 EDT 2020}

}

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