| Title |
Verification of a Supercapacitor-Based Compensation Method for Mitigating Voltage Drop under Sudden Load Changes in Photovoltaic Systems |
| Authors |
원영제(Young-Je Won) ; 손진근(Jin-Geun Shon) ; 홍성준(Seong-Joon Hong) |
| DOI |
https://doi.org/10.5370/KIEE.2026.75.5.1211 |
| Keywords |
DC-bus voltage compensation; Supercapacitor; Standalonge PV system; Load variation; Voltage drop |
| Abstract |
This paper proposes a supercapacitor-based compensation scheme to mitigate load-induced voltage drop in grid-forming photovoltaic systems. In standalone PV systems without power compensation, abrupt load changes can cause output voltage drops that degrade system reliability and disrupt connected loads, while battery-based storage is often too slow for sub-second voltage regulation. The proposed approach connects a supercapacitor to the converter DC stage, monitors operating conditions in real time, and injects auxiliary power immediately when a voltage drop is detected. Simulation confirms that the method maintains the inverter output voltage near its reference under rapid load steps and substantially reduces the load-side voltage drop. The proposed scheme can improve power quality in grid-forming applications such as standalone PV systems, microgrids, and electric vehicle charging stations with frequent load variations. |