An Improved Nonlinear PI-Based Control Strategy for a Vienna Rectifier II-Based EV Powertrains Charging System
18th International Conference on Electronics, Computers and Artificial Intelligence, ECAI 2026, Bucharest, Romanya, 2 - 03 Temmuz 2026, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.1109/ecai69016.2026.11613701
- Basıldığı Şehir: Bucharest
- Basıldığı Ülke: Romanya
- Anahtar Kelimeler: EV Powertrain, fast-charging, neutral-point balancing, nonlinear PI, Vienna Rectifier II
- Van Yüzüncü Yıl Üniversitesi Adresli: Evet
Özet
The worldwide expansion of DC fast-charging infrastructure is accelerating to meet the continuously rising demand from the electric vehicle sector. This rapid growth imposes considerable pressure on existing electrical distribution networks, especially due to the increasing deployment of high-power charging stations and their strict requirements for maintaining power quality and grid stability. In this context, power electronic converters play a central role in enabling efficient and reliable energy conversion between the grid and electric vehicles. To address these issues, this paper proposes a nonlinear PI (N-PI) based control strategy for a Vienna rectifier-based EV charging system. The proposed control method is designed to enhance dynamic response, improve disturbance rejection capability, and maintain stable DC-link voltage regulation under varying operating scenarios, including reference changes, load variations, and imbalance conditions. Furthermore, an N-PI-based neutral-point balancing controller is applied in the Vienna rectifier system to reduce DC-link capacitor voltage imbalance and maintain stable midpoint voltage regulation. The proposed approach significantly improves dynamic performance compared to the conventional PI (C-PI) controller. Specifically, the DC-link voltage ripple is reduced from more than 3.0 V (C-PI) to below 1.0 V (N-PI). In addition, the settling time is improved, with the C-PI controller requiring more than one grid period (≈20 ms), whereas the proposed N-PI controller achieves faster stabilization within a significantly shorter time. The effectiveness of the proposed approach is verified through comparative analysis with C-PI control, demonstrating improved overall system performance, reduced voltage oscillations, and enhanced robustness for next-generation fast-charging applications.