A Novel Filter With High Harmonics Attenuation and Small Dimension for Grid-Connected Inverter

Koiwa, Kenta; Takahashi, Harutaka; Zanma, Tadanao; Liu, Kang‐Zhi; Natori, Kenji; Sato, Yukihiko

doi:10.1109/tpel.2022.3207432

Cited by 8 publications

(1 citation statement)

References 29 publications

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“…As an example of inverter control, in [6], a control strategy was put forth for designing sequence-asymmetric systems with the aim of locally correcting harmonic voltage issues. In [7], the authors present a technical idea that integrates a nearest-level controller with selective harmonic elimination control to improve the quality of the inverter's output terminal voltage while minimizing harmonic distortion; a new hybrid frame controller is introduced, where the synchronous frame is utilized for the adaptive harmonic compensatory in the grid-connected inverter [8]; in [9], the article proposes a novel filter, which effectively attenuates harmonics with small inductance for grid-connected inverters. Generally, control-based methods focus on active power sources by regulating the switching patterns of inverters.…”

Section: Introduction 1current State-of-the-artmentioning

confidence: 99%

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

Safarishaal,

Hemmati,

Saeed Kandezy

et al. 2024

Energies

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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.

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