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DOI number:10.1007/s00202-024-02856-0

Journal:Electrical Engineering

Key Words:Three-phase voltage unbalance factor · Butterworth-based improved second-order generalized integrator · Instantaneous symmetric components · Phase-locked loop

Abstract:Since the three-phase voltage unbalance factor is a crucial index for assessing power quality, real-time monitoring of the
three-phase voltage unbalance is crucial for ensuring the safety of the power grid. In order to realize the online monitoring
of three-phase voltage unbalance, the second-order generalized integrator (SOGI) is used to generate quadrature signals at
the fundamental frequency. Addressing the issue that the SOGI cannot effectively filter harmonics and DC components, a
Butterworth-based improved second-order generalized integrator (BISOGI) is first proposed in this paper. Subsequently, to
achieve real-time measurement of the three-phase voltage unbalance factor in a three-phase four-wire low-voltage distribution
network, a BISOGI-based improvement method is presented and the detailed signal processing process is analyzed. Finally,
an experimental platform is constructed to verify the proposed model under the influence of harmonics and DC offset. The
experimental results indicate that the new method not only filters out harmonics and DC components but also achieves high
accuracy that complies with the standards set by GB/T 15543-2008 and IEC61000-4-27, with a real-time response speed
under any conditions.

Indexed by:Journal paper

Discipline:Engineering

Document Type:J

Translation or Not:no

Date of Publication:2024-11-18

Included Journals:SCI

Date of Publication:2024-11-18