Passivity-Based Controller Design of Grid-Connected VSCs for Prevention of Electrical Resonance Instability

By Lennart Harnefors, Alejandro G. Yepes, Ana Vidal, J. Doval‐Gandoy. IEEE transactions on industrial electronics (1982. Print), 2015

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Analysis of Resonance Between a VSC-HVDC Converter and the AC Grid (2018, methodology): “Different methods of reshaping impedance to get a positive-real-part in the desired frequency regions by adjusting the controller parameters are provided in [17] and [20].”
Extended State Observer-Based Sliding-Mode Control for Three-Phase Power Converters (2017, background): “Several nonlinear control approaches have been proposed for grid-tied power converters, such as nonlinear adaptive control [10], passivity-based control [11], model predictive control [12], and sliding-mode control (SMC) [13]–[17].”
Passivity-Based Stability Assessment of Grid-Connected VSCs—An Overview (2016, methodology): “In [2] and [5], it is shown that the negative-real-part region caused by the total time delay begins at the critical frequency fcrit at which cos ωTd (for ω = 2π fcrit) changes sign from positive to negative, i.”
Modeling and Analysis of VSC-Based HVDC Systems for DC Network Stability Studies (2016, background): “Observe that the VSC can be modeled as a linear amplifier since the frequencies of interest are well below the VSC switching frequency (2 kHz), as also suggested in [8], [12], and [14].”