Methodology for the analysis of dc‐network resonance‐related instabilities in voltage‐source converter‐based multi‐terminal HVDC systems

Stability Analysis of High-Frequency Interactions Between a Converter and HVDC Grid Resonances

“…Based on an eigenvalue analysis and impedance-based analysis, similar results were obtained in [19] where the DC voltage controller was shown to adversely impacts the lower frequency dynamics of a cable-based MMC-based HVDC link. A method to investigate dc network instabilities in multi-terminal HVDC systems with two-level VSCs has been presented in [20]. Unstable resonances below twice the fundamental frequency were identified.…”

Active Damping of VSC-MTDC Grid Equipped With Interline Power Flow Controller

“…The MTDC grid is a complex system prone to instability due to system resonance and controllers' interactions. Instabilities originating from the dc-network resonances have been reported in [27], [28]. The dc-link capacitor is a critical component in VSC stations which is designed considering the voltage ripple limit requirement and acceptable controller dynamics.…”

“…The critical eigenvalues of the MTDC grid based on the detailed model in (27) are depicted in Fig. 7.…”

“…Another problem that challenges the secure and safe operation of an MTDC grid is the current oscillations originating from MTDC grid resonance. The negative impacts of dc-side resonance on the stability of an HVDC grid were presented in [27], [28]. To solve this problem, active compensators were incorporated with the voltage droop control loop as in [28], [29].…”

Hybrid‐wave modulation for modular multilevel high‐frequency DC converter in DC distribution application

“…In addition, the DC distribution network has a prosperous future with the development of DC distributed power source, energy storage devices, and DC loads [3, 4]. Current studies on DC distribution network not only focus on the low‐voltage DC (LVDC), but also extend to the medium‐(MVDC) and high‐voltage DC (HVDC) distribution networks [5, 6].…”