This study presents the implementation of a direct power control (DPC) system based on virtual flux for an eco-friendly ship utilizing a low voltage DC distribution within a Simulink environment. The proposed system regulates the DC bus voltage and the instantaneous power of the generator. The electrical load of the generator is classified into three levels (low, medium, and high) and subjected to ±10% variations. Under these conditions, the characteristics of the DC bus voltage and current, instantaneous active and reactive power as well as the voltage and current of the generator, are thoroughly analyzed. The simulation results indicate that the DC bus voltage and instantaneous active and reactive power remain stable and well-regulated at their set-points despite load fluctuations. Furthermore, the voltage and current of the generator, consistently maintain sinusoidal waveforms and remain in phase. These findings validate the effectiveness of the proposed virtual flux-based direct power control strategy, demonstrating its suitability for DC distribution applications in maritime vessels.

서 론
재료 및 방법
    3상 PWM 정류기의 수학적 모델
    가상 자속과 순시 전력
    가상 자속 직접 전력 제어
결과 및 고찰
결 론
References

• 김종필(한국해양수산연수원 오션폴리텍해운팀 교수) | Jong-Phil KIM (Professor, Ocean Polytech Maritime Team, Korea Institute of Maritime and Fisheries Technology, Busan 48562, Korea)
• 이윤형(한국해양수산연수원 해양기술교육팀 교수) | Yun-Hyung LEE (Professor, Ocean Technology Training Team, Korea Institute of Maritime and Fisheries Technology, Busan 48562, Korea) Corresponding author
• 류기탁(한국해양수산연수원 해양기술교육팀 교수) | Ki-Tak RYU (Professor, Ocean Technology Training Team, Korea Institute of Maritime and Fisheries Technology, Busan 48562, Korea)