Nonlinear Impact of Topological Configuration of Coupled Inverter-Based Resources on Interaction Harmonics Levels of Power Flow

Masoud Safarishaal (), Rasul Hemmati, Reza Saeed Kandezy, John N. Jiang, Chenxi Lin and Di Wu
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Masoud Safarishaal: School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA
Rasul Hemmati: School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA
Reza Saeed Kandezy: School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA
John N. Jiang: School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA
Chenxi Lin: Energy & Power, Jacobs Engineering Group, Orlando, FL 32801, USA
Di Wu: Electrical and Computer Engineering Department, North Dakota State University, Fargo, ND 58105, USA

Energies, 2024, vol. 17, issue 11, 1-16

Abstract: The increasing level of harmonics in the power grid, driven by a substantial presence of coupled inverter-based energy resources (IBRs), poses a new challenge to power grid transient stability. This paper presents the findings from experiments and analytical studies on the impact of the topological configuration of coupled IBRs on the level of power flow harmonics in a distribution grid: (i) our findings report that the impact of grid topology on harmonics is nonlinear, which is in contrast to the common perception that the power grid operates as a large linear low-pass filter for harmonics; (ii) importantly, this study highlights that the influence of the topological configuration of inverters on the reduction of system-level harmonics is more substantial than the effect of line impedance, emphasizing the significance of grid topological configuration; (iii) furthermore, the observed reduction in harmonics is attributed to a harmonic cancellation effect achieved through self-compensation by all the coupled inverters without affecting the active power flow in the power grid. These findings propose a new approach to limit the penetration of complex IBR harmonics in the power grid from a system-wide perspective. This approach significantly differs from the component-level or localized solutions used today, such as inverter control, power filtering, and transformer tap changes.

Keywords: coupled inverter systems; harmonic levels; topological configuration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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