On Stability of PQ-Controlled Grid-Following and Droop-Control Grid-Forming Inverters

Hossen, Tareq; Mirafzal, Behrooz

doi:10.1109/ecce50734.2022.9947923

On Stability of PQ-Controlled Grid-Following and Droop-Control Grid-Forming Inverters

Conference · 09 October 2022 · 2022 IEEE Energy Conversion Congress and Exposition (ECCE)

DOI:https://doi.org/10.1109/ecce50734.2022.9947923· OSTI ID:1905748

Hossen, Tareq ^[1]; Mirafzal, Behrooz ^[1]

Kansas State University,Department of Electrical and Computer Engineering,Manhattan,KS,USA

In this paper, the nonlinearity impacts of PQ-control schemes and LCL filter parameter variations on the stability of grid-interactive inverters are studied under weak grid conditions. This work demonstrates that the control nonlinearity and parameter variations can cause unexpected instability at low power levels. This instability issue in the nominal operating range may occur under specific control parameters due to the shift of the low-frequency eigenvalues of PQ-controlled inverters. A full-order small-signal model for PQ-controlled inverters is applied to analyze this instability issue. Furthermore, the impacts of the droop coefficients on the stability of the droop-controlled grid-forming inverter are also investigated using the closed-loop inverter model. The findings are experimentally verified using a small-scale two-level 208 V, 5 kVA inverter feeding a 12 kW NHR 9410 power grid emulator and a hardware setup of a microgrid fed by two 5 kVA 208V inverters.

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Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

DOE Contract Number:: EE0008767

OSTI ID:: 1905748

Report Number(s):: DOE-KSU-8767

Journal Information:: 2022 IEEE Energy Conversion Congress and Exposition (ECCE), Conference: 2022 IEEE Energy Conversion Congress and Exposition (ECCE) Detroit, MI, USA 09-13 October 2022

Country of Publication:: United States

Language:: English

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