Fault Current Control and Protection in a Standalone DC Microgrid Using Adaptive Droop and Current Derivative

Augustine, Sijo; Reno, Matthew J.; Brahma, Sukumar M.; Lavrova, Olga

doi:10.1109/jestpe.2020.2984609

Title: Fault Current Control and Protection in a Standalone DC Microgrid Using Adaptive Droop and Current Derivative

Journal Article · Tue Mar 31 00:00:00 EDT 2020 · IEEE Journal of Emerging and Selected Topics in Power Electronics

DOI:https://doi.org/10.1109/jestpe.2020.2984609· OSTI ID:1870482

^[1];

^[2];

^[3]; Lavrova, Olga ^[1]

New Mexico State Univ., Las Cruces, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Clemson Univ., SC (United States)

This report presents a novel fault detection, characterization, and fault current control algorithm for a standalone solar-photovoltaic (PV) based dc microgrids. The protection scheme is based on the current derivative algorithm. The overcurrent and current directional/differential comparison based protection schemes are incorporated for the dc microgrid fault characterization. For a low impedance fault, the fault current is controlled based on the current/voltage thresholds and current direction. Generally, the droop method is used to control the power-sharing between the converters by controlling the reference voltage. In this article, an adaptive droop scheme is also proposed to control the fault current by calculating a virtual resistance R droop , and to control the converter output reference voltage. For a high impedance fault, differential comparison method is used to characterize the fault. These algorithms effectively control the converter pulsewidth and reduce the flow of source current from a particular converter, which helps to increase the fault clearing time. Additionally, a trip signal is sent to the corresponding dc circuit breaker (DCCB), to isolate the faulted converter, feeder or a dc bus. The dc microgrid protection design procedure is detailed, and the performance of the proposed method is verified by simulation analysis.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 1870482

Report Number(s):: SAND2022-3812J; 704990

Journal Information:: IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 9, Issue 3; ISSN 2168-6777

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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24 POWER TRANSMISSION AND DISTRIBUTION
Microgrids
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Fault currents
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Title: Fault Current Control and Protection in a Standalone DC Microgrid Using Adaptive Droop and Current Derivative

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