TY - GEN
T1 - Stability Analysis and Oscillation Mechanism of Offshore Wind-PV-Storage Integrated via MMC-HVDC System
AU - Sun, Yuxi
AU - Zhang, Yuyue
AU - Ma, Li
AU - Xu, Shichao
AU - Li, Zhen
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - The integration of large-scale offshore renewables via MMC-HVDC is prone to wide-band oscillations. This paper presents an impedance-based stability analysis method for an offshore wind-PV-storage MMC-HVDC system. The system is decomposed into an aggregated current-source subsystem (wind, PV, storage) and a voltage-source subsystem (MMC and grid). Stability is assessed using the Maximum Peak Nyquist Criterion (MPC), which quantifies the stability margin via the minimum radius Rmin from the Nyquist curve of the impedance ratio to the critical point. Analysis reveals that a weaker grid (lower shortcircuit ratio) and certain MMC controller parameters reduce Rmin, degrading stability and inducing oscillations at specific frequencies (e.g., 63 Hz), as validated by time-domain simulations in PSCAD/EMTDC.
AB - The integration of large-scale offshore renewables via MMC-HVDC is prone to wide-band oscillations. This paper presents an impedance-based stability analysis method for an offshore wind-PV-storage MMC-HVDC system. The system is decomposed into an aggregated current-source subsystem (wind, PV, storage) and a voltage-source subsystem (MMC and grid). Stability is assessed using the Maximum Peak Nyquist Criterion (MPC), which quantifies the stability margin via the minimum radius Rmin from the Nyquist curve of the impedance ratio to the critical point. Analysis reveals that a weaker grid (lower shortcircuit ratio) and certain MMC controller parameters reduce Rmin, degrading stability and inducing oscillations at specific frequencies (e.g., 63 Hz), as validated by time-domain simulations in PSCAD/EMTDC.
KW - Impedance-Based Stability
KW - MMC-HVDC
KW - Maximum Peak Criterion
KW - Offshore Wind Power
KW - Oscillation Analysis
UR - https://www.scopus.com/pages/publications/105033636522
U2 - 10.1109/IC2ECS68700.2025.11361730
DO - 10.1109/IC2ECS68700.2025.11361730
M3 - Conference contribution
AN - SCOPUS:105033636522
T3 - 2025 5th International Conference on Electrical Engineering and Control Science, IC2ECS 2025
SP - 1020
EP - 1024
BT - 2025 5th International Conference on Electrical Engineering and Control Science, IC2ECS 2025
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 5th International Conference on Electrical Engineering and Control Science, IC2ECS 2025
Y2 - 5 December 2025 through 7 December 2025
ER -