Fast harmonic analysis for PHIL experiments with decentralized real-time controllers

• Published in: Electric power systems research Vol. 211; p. 108493
• Main Authors: Sezgin, Erhan, Mohapatra, Anurag, Hamacher, Thomas, Salor, Özgül, Perić, Vedran S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2022
• Subjects: DFT; Distributed control; Frequency shifting; Power hardware-in-the-loop; Prosumers; Distributed control; Power hardware-in-the-loop; DFT; Frequency shifting; Prosumers
• ISSN: 0378-7796
• DOI: 10.1016/j.epsr.2022.108493

This paper proposes and implements, a harmonic analysis technique used in microgrids for inverter power control when measured voltage and current signals are passed over a communication link with considerable latency. Using frequency-shifting and filtering techniques, the measurement is converted to magnitude and phase information and passed over an asynchronous communication link to another controller, where the original waveform is recovered with delay compensation. The method allows accurate power calculations and grid synchronization over distributed prosumer controllers. The proposed method can work at different execution rates, depending on real time (RT) workload, and is shown to be robust against step changes, harmonics and communication delays. The method is demonstrated with two PHIL experiments at the CoSES, TU Munich lab in grid connected and island mode. •Expanding microgrids lead to Measurement points getting farther from controllers.•Developed algorithm synchronizes measurements from various points.•Algorithm is validated in microgrid laboratory at TU Munich.•Real time harmonic analysis is performed for power control feedback.•Demonstrated real time power control irrespective of measurement location.