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Title: Study of Inverter Control Strategies on the Stability of Low-Inertia Microgrid Systems

Conference ·
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This paper investigates the stability of low-inertia microgrid systems with two control strategies that have different percentages of grid-forming (GFM) inverters. The first control strategy has approximately 50% GFM inverters, and all the battery inverters are working in GFM control mode. Originally, the second control strategy has approximately 10% GFM inverters, with only two battery inverters working in GFM control mode and the rest working in grid-following (GFL) PQ control mode based on current control, which cannot stabilize the microgrid system. Then, the second control strategy is modified to change the GFM inverters from droop control to isochronous control and the GFL battery inverters from traditional current control to voltage control for power control. Both control strategies can maintain system stability; however, the first control strategy can better handle contingency events. The study indicates that 1) a microgrid system with a higher percentage of GFM inverters has better stability; and 2) a microgrid with a lower percentage of GFM inverters can have poor stability, but improved control strategies in inverters can improve system stability. This study improves the understanding of how different percentages of GFM inverters and inverter control strategies affect the system stability of low-inertia microgrids.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1916451
Report Number(s):
NREL/CP-5D00-85116; MainId:85889; UUID:440f40ff-9754-4eb2-a380-64c382488abe; MainAdminID:68540
Resource Relation:
Conference: Presented at the 48th Annual Conference of the IEEE Industrial Electronics Society (IECON), 17-20 October 2022, Brussels, Belgium; Related Information: 81403
Country of Publication:
United States
Language:
English

References (13)

Evaluation of Optimal Net Load Management in Microgrids Using Hardware-in-the-Loop Simulation conference April 2022
Evaluation of Horizon of Viability Optimization Engine for Sustained Power to Critical Infrastructure conference March 2022
Design of a Generalized Control Algorithm for Parallel Inverters for Smooth Microgrid Transition Operation journal August 2015
Design of a Non-PLL Grid-forming Inverter for Smooth Microgrid Transition Operation conference August 2020
A study of feedforward control on stability of grid-parallel inverter with various grid impedance conference June 2014
A Unified Droop-Free Distributed Secondary Control for Grid-Following and Grid-Forming Inverters in AC Microgrids conference August 2020
Design Power Control Strategies of Grid-Forming Inverters for Microgrid Application conference October 2021
Dynamic Interaction of Grid-Forming and Grid-Following Inverters with Synchronous Generators in Hybrid Power Plants conference April 2021
Comparison of Grid Following and Grid Forming Control for a High Inverter Penetration Power System conference August 2018
Region-based Stability Analysis of Resilient Distribution Systems with Hybrid Grid-forming and Grid-following Inverters conference October 2020
Impacts of Inverter Control Strategies on the Stability of Low-Inertia Power Systems conference August 2020
Grid-Forming Inverters: A Critical Asset for the Power Grid journal June 2020
Stability Issues with Inverter Loads and Their Control in Low Inertia Islanded Microgrids conference October 2020

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Related Subjects

POWER TRANSMISSION AND DISTRIBUTION
droop control
grid-following control
grid-forming control
voltage and frequency stability