講演情報
[17p-M_135-5]Supercapacitor Sizing via Analytical Modelling of Transient Voltage Recovery
〇(DC)Malitha Dilshan Premasiri1, Kasun Piyumal1, Aruna Kumara Ranaweera1, Sudath R D Kalingamudali1 (1.Department of Physics and Electronics, University of Kelaniya, Sri Lanka 11600)
キーワード：
Photovoltaic interfaces、Supercapacitor buffering、Impedance analysis
Supercapacitors are widely used for transient voltage stabilisation in low-voltage DC energy systems due to their high power density and fast charge–discharge capability. In applications such as SCALED systems and photovoltaic DC links, supercapacitors buffer short-duration power imbalances that occur on timescales faster than converter control-loop response. However, supercapacitor sizing in practice is still largely based on empirical rules or iterative simulations, providing limited physical insight into transient voltage recovery behaviour.This work presents an analytical framework for supercapacitor sizing based on explicit modelling of transient voltage recovery. The supercapacitor interface is represented as a first-order resistive–capacitive system derived from Kirchhoff’s voltage law. The transient DC-bus voltage response is analytically separated into two physically distinct components: an instantaneous voltage deviation caused by equivalent series resistance, followed by a time-dependent capacitive recovery governed by charge redistribution. This formulation highlights the non-interchangeable roles of capacitance and resistance in shaping transient voltage behaviour and clarifies the limitations of sizing approaches that treat capacitance as the sole design variable.Time-domain MATLAB–Simulink simulations are used to evaluate transient responses under representative disturbance conditions. The results show voltage trajectories consistent with the analytically predicted resistive drop and exponential recovery characteristics. The proposed approach provides a physically transparent basis for selecting supercapacitor capacitance in low-voltage DC systems requiring controlled transient voltage recovery.