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선박 동적 모델을 고려한 하이브리드 시스템의 운영 제어 알고리즘 개발
김성안 대한전기학회 2020 전기학회논문지 Vol.69 No.7
The performance of a hybrid electric propulsion ship depends on the interaction of the diesel generator and the energy storage system. Therefore, this paper presents a basic design to replace the mechanical-electric propulsion system with the hybrid propulsion system. In addition, an operation control algorithm is proposed to extend the operating time and reduce the fuel consumption of ship. The proposed control consists of three modes based on the output curve according to the motor speed of rim driven propulsor. ON and OFF operation of diesel generator and the charging and discharging of the energy storage system are determined depending on the control mode. The feasibility of the proposed algorithm is verified by using the load simulation considering the ship dynamic model which improved the conventional simple load profile. As a result, fuel consumption is expected to be reduced by about 4% compared to conventional mechanical-electric propulsion systems.
멀티 레벨 인버터를 갖춘 가변속 구동식 터보 공기 압축기 시스템의 동특성 해석을 위한 평균 모델 개발
김성안,홍경표 대한전기학회 2020 전기학회논문지 Vol.69 No.8
An integrated model considering the electrical and mechanical models is required to analysis a dynamic characteristics of a variable speed driven turbo air compressor system with a multi level inverter. In the electrical model, a detailed model with a small sampling time is essential because of the multi level inverter with high frequency switching operation. The small sampling time has long computation time to obtain the accurate analysis results of the system. Therefore, this paper proposes an average model of the multi level inverter to reduce the computation time. In addition, a mechanical model to analysis the dynamic characteristics of turbo air compressor system is proposed and the validity of integrated models are verified through simulation considering experimental operating conditions. The rapidity and accuracy of the proposed average model are verified by comparing with the conventional detailed model.
개선된 12 스텝 제어를 고려한 브러시리스 DC 전동기의성능 향상을 위한 최적화 설계
김성안,조윤현 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.1
This paper presents an optimal design of a brushless DC motor considering an advanced 165° 12 step control for a costreduction. The advanced 12 step control that extends the conduction angle 150° can improve the output of the motor. Theoptimal design considering the improved output power of the motor is proposed by reducing the volume of rotor, statorand permanent magnet using response surface method. The proposed design satisfied the performance requirements andefficiency improvement of the conventional motor and reduced the volume about 3.5%. The feasibility of the optimaldesign is proved by the electromagnetic field analysis using the finite element method 본 논문에서는 원가 절감을 위한 개선된 165° 12 스텝 제어를 고려한 브러시리스 DC 전동기의 최적화 설계에 대하여 논한다. 개선된 12 스텝 제어는 기존 제어의 도통각 150°을 확장시켜 전동기의 출력을 향상 시킬 수 있다. 향상된 전동기 출력을고려한 반응 표면법을 이용한 최적화 설계를 통해서 회전자, 고정자 및 영구자석의 부피를 감소시켜 원가절감이 가능한 설계를 제시한다. 제안된 설계는 기존 전동기의 요구 사양 및 효율 향상을 만족하고 기존 전동기 중량의 약 3.5%를 저감하였다. 유한요소법을 이용한 전자계 해석을 통해 최적화 설계의 타당성을 입증하였다.
수중 드론용 일체형 추진기의 프로펠러 구조를 고려한 전동기의 설계 및 특성 분석
김성안 대한전기학회 2020 전기학회논문지 Vol.69 No.7
This paper presents the design and characteristic analysis of a motor considering the propeller structure of an integrated propulsor for a underwater drone. In order to improve the hydraulic efficiency of the integrated propulsor, it is essential to simplify the structure of propulsor, minimize the motor size and improve the performances of motor. This paper proposes a fixing pin for fastening the rotor of motor and the propeller. Through the basic design of motor size and optimum design considering the proposed structure, it was satisfied with the requirement specifications and performance improvement of the motor. The validity of the design was verified by stress analysis of the propeller and electromagnetic analysis and thermal analysis of the motor.
일체형 플라이휠 구동용 내장형 전동기의 최적 설계에 관한 연구
김성안 대한전기학회 2020 전기학회논문지 Vol.69 No.9
The gyro stabilizer that reduces the lateral fluctuation of a ship generates a precession torque of the gimbal using the flywheel moment of inertia. An electric motor is needed to drive the flywheel. The conventional gimbal has a problem of a increase in installation space and weight because the fastening between the flywheel and the motor is made of a belt pulley. Therefore, this paper proposes an integrated structure in which the motor is installed inside the flywheel and presents the optimal design of the built-in motor to improve performance. The mechanical and electrical effectiveness of the proposed gimbal was verified through stress analysis, electromagnetic analysis and thermal analysis.
김성안,한성우,조윤현 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
This paper presents an optimal initial firing angle control based on the energy consumption and regenerative energy of a parallel multi-pulse thyristor dual converter for urban railway power substations. To prevent short circuiting the thyristor dual converter, a hysteresis band for maintaining a zero-current discontinuous section (ZCDS) is essential during mode changes. During conversion from the ZCDS to forward or reverse mode, the DC trolley voltage can be stabilized by selecting the optimal initial firing angle without an overshoot and slow response. However, the optimal initial firing angle is different depending on the line impedance of each converter. Therefore, the control algorithm for tracking the optimal initial firing angle is proposed to eliminate the overshoot and slow response of DC trolley voltage. Simulations and experiments show that the proposed algorithm yields the fastest DC voltage control performance in the transient state by tracking the optimal firing angle.
자가발전이 가능한 독립형 MPPT 태양광 DC/DC 부스트 컨버터에 관한 연구
김성안,이상건,변상인,조윤현 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
독립형 태양광 발전 시스템은 일사량에 의존한다. 일사량이 부족한 경우. 태양광 발전 시스템의 제어기는 충전된 배터리 전력을 소비하여 작동된다[1]. 배터리의 충전량이 충분하지 못하는 경우 태양광 발전 시스템의 전력공급이 불안정해진다. 본 논문의 목적은 제어기 작동을 위한 배터리 전력을 자가발전이 가능한 독립형 태양광 DC/DC 컨버터로 대체하는 것이다. DC/DC 컨버터는 저가형 8bit 컨트롤러를 기반으로 한다. 태양전지의 출력 제어는 MPPT(Maximum Power Point Tracking)를 이용한다. 자가발전의 방법은 태양전지의 PV곡선 특성을 고려한 히스테리시스 비교기를 기반으로 한다. 시뮬레이션과 실험을 통해 타당성을 입증한다.