TY - GEN
T1 - A general state-space model of VSC DC-side dynamics
AU - Darii, Nicolae
AU - Mugambi, Germano Rugendo
AU - Taranin, Nikita
AU - Saborío-Romano, Oscar
AU - Sharma, Ranjan
AU - Khazraj, Hesam
AU - Cutululis, Nicolaos A.
PY - 2025
Y1 - 2025
N2 - The growing integration of inverter-based resources (IBRs) provides net-zero-emission benefits. However, it also introduces new instability challenges that arise from interactions with the power system or other IBRs. Identifying this phenomenon in advance drives the analysis to methods such as those in the frequency domain, where global information can be gathered. The scientific literature contains many IBR representations that do not consider DC-side dynamics or in which such dynamics are embedded within specific models. This complicates their extraction and use in the representation of other IBRs. This paper suggests a general modeling technique to define DC-side dynamics as a function of AC-side variables and sources. The method is verified against a static synchronous compensator (STATCOM), represented using a switching model. The verification is then extended to an aggregated offshore wind power plant model based on type-4 wind turbines with point-to-point HVDC transmission to shore. The approach provides a fundamental building block defining voltage-source converter DC-side dynamics: a capacitor and two ideal controlled current sources, one for charging and the other for discharging. The model is a nonlinear differential equation with states accessible from the AC side. The simulation results show that it is possible to synthesize the DC dynamics uniquely for the three applications considered, and potential extension for DC systems is possible.
AB - The growing integration of inverter-based resources (IBRs) provides net-zero-emission benefits. However, it also introduces new instability challenges that arise from interactions with the power system or other IBRs. Identifying this phenomenon in advance drives the analysis to methods such as those in the frequency domain, where global information can be gathered. The scientific literature contains many IBR representations that do not consider DC-side dynamics or in which such dynamics are embedded within specific models. This complicates their extraction and use in the representation of other IBRs. This paper suggests a general modeling technique to define DC-side dynamics as a function of AC-side variables and sources. The method is verified against a static synchronous compensator (STATCOM), represented using a switching model. The verification is then extended to an aggregated offshore wind power plant model based on type-4 wind turbines with point-to-point HVDC transmission to shore. The approach provides a fundamental building block defining voltage-source converter DC-side dynamics: a capacitor and two ideal controlled current sources, one for charging and the other for discharging. The model is a nonlinear differential equation with states accessible from the AC side. The simulation results show that it is possible to synthesize the DC dynamics uniquely for the three applications considered, and potential extension for DC systems is possible.
KW - Voltage-source converter DC-side dynamics
KW - State-space model
U2 - 10.1049/icp.2025.1205
DO - 10.1049/icp.2025.1205
M3 - Article in proceedings
T3 - IET Conference Proceedings
SP - 198
EP - 204
BT - Proceedings of 22nd IET International Conference on AC and DC Power Transmission (ACDC Global 2025)
PB - Institution of Engineering and Technology
T2 - 22nd IET International Conference on AC and DC Power Transmission
Y2 - 17 March 2025 through 19 March 2025
ER -