Study of Resonance Issues Between HVDC Link and Power System Components Using EMT Simulations

Self-Synchronized Grid Impedance Estimation Unit Using Interpolated DFT Technique

“…U SE of power electronics converters in the grid for interfacing AC and DC grids [1], [2], renewable sources (wind turbine, PV source...) [3] or battery storage systems [4] is growing. However, the power conversion action of those controller-based actively regulating devices may result in instabilities and large harmonic power flows [5] in the grid as reported in several incidents that occurred in Switzerland in 1995 [6], in Germany in 2013 [7] and in France and Spain in 2016 [8], [9]. The origin of those faults is the interaction between the grid and the converters, and more precisely, between the grid impedance and the converter admittances that were not passive in the expected frequency range.…”

Generalized impedance-based AC/DC power system modeling for harmonic stability analysis

“…Hitherto, impedance-based converter interaction analysis (also referred to as harmonic or electromagnetic stability analysis) for AC or DC systems has been studied in many works [4,5,6], considering the impact of different parameters/controllers [2], [5,6,7,9,10,11,12,13]. However, harmonic stability analysis has so far mainly been limited to one part of the system, i.e.…”

Equivalent Impedance Calculation Method for Control Stability Assessment in HVDC Grids

“…While these works significantly contribute to stability analysis in MTDC networks, a major disadvantage of these white-box approaches is that they require detailed knowledge about the structure of the MMC control systems. Therefore, they are not applicable for multi-vendor based MTDC networks, as the disclosure and exchange of sufficiently accurate analytical converter and control models is highly improbable due to proprietary reasons [5,9]. Instead of using a single whitebox model for stability assessment of a DC network, a modular approach with defined interfaces could be used.…”