Detection of Cyber-Attacks on Grid-Connected Converter with Output LCL Filter
Viktor Valouch(1),Martin Bejvl(2), Petr Šimek(2), Miroslav Chomát(2) 1. Faculty of Electrical EngineeringCzech Technical UniversityPrague, Czech Republic 2. Department of Electrotechnics and Electrophyzics, Insitute of Thermomechanics, Czech Academy of Sciences, Praha, Czech Republic 2026-06-27

Abstract

This paper presents the implementation of a cyber-attack detection system based on a watermarking strategy for a grid-connected power electronic converter equipped with an LCL filter. Mathematical models of the system are established to derive the detection equations. The proposed strategy was verified through both Matlab/Simulink simulations and laboratory experiments using a dSPACE-based control platform. The analysis focuses on voltage and current waveforms under both nominal operation and simulated scaling attacks on the sensors. The results demonstrate that the watermarking strategy is an effective tool for identifying compromised measurement data and ensuring the security of control systems in grid-connected converter.

Key words: cyber attack detection system, watermark strategy, power electronic converter, LCL grid filter, simulation, laboratory tests

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