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Keywords

multi-infeed renewable power system, asymmetric fault, transient overvoltage, comparative analysis, accurate calculation method

Abstract

During fault recovery，transient overvoltages （TOVs ） have become an increasingly prominent issue in power systems with high penetration of renewable energy sources.However，related research，primarily focusing on three-phase short-circuit faults，rarely addresses asymmetric fault scenarios.This study approaches the issue by analyzing the transient characteristics of renewable energy units under asymmetric faults.Then，it presents an equivalent model incorporating negative-sequence control and compares the severity of TOVs caused by three-phase symmetric and asymmetric short-circuits in a single-unit system.Furthermore，to address the difficulty in characterizing the coupling between generation units and between the units and negative-sequence control in multi-infeed systems，the study proposes an iterative TOV calculation method based on positive- and negative-sequence components.This method models renewable energy units with negative-sequence control as voltage-controlled current sources and accurately evaluates the overvoltages during the fault and after fault clearance by iteratively solving port voltages and injected currents.Finally，electromagnetic transient simulations are conducted on the PSCAD/EMTDC numerical simulation and analysis platform to verify the effectiveness of the proposed method.This method can serve as a reference for calculating TOVs in multi-infeed renewable power systems under asymmetric faults.

DOI

10.19781/j.issn.1673-9140.2026.04.022

First Page

267

Last Page

277

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