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자이로 발전 시스템의 출력 전력 구간 증가를 위한 제어에 관한 연구
김성안(Sung-An Kim) 대한전기학회 2020 전기학회논문지 Vol.69 No.4
In small sized ships, gyro stabilizers are effective in preventing rollover accidents and improving boarding comfort. The gyro stabilizer reduces hull lateral fluctuations using a precession torque of the gimbal generated by the moment of inertia of flywheel. The gyro power generation system can be used as an electric brake of the gimbal by connecting a generator directly to the shaft where the precession torque is generated and to power the load. The proper control is required to effectively supply the electrical energy of the generator to the load because of a difference in the output power of the generator according to the controls. The conventional control has a discontinuous power generation section because it generates the torque through current control according to the rotational speed. Therefore, this paper proposes the speed control to increase the output power section of the generator. The validity of the proposed control is verified by simulation results.
Brushless DC Motor의 토크 리플 저감을 위한 개선된 Twelve-Step 센서리스 알고리즘에 관한 연구
김성안(Sung-An Kim),이상건(Sang-Geon Lee),조윤현(Yun-Hyun Cho) 대한전기학회 2014 대한전기학회 학술대회 논문집 Vol.2014 No.4
This paper proposes the algorithm by advanced twelve step sensorless control to reduce torque ripple and harmonic current of brushless DC(BLDC) motor with sinusoidal back EMF. The algorithm has a two commutation step structure, with the twelve step used to estimate the correct rotor position, and the six step utilized to correct the calculated applied voltage. It is the pulse width modulation(PWM) control method in which the applied voltage is calculated from the no load current and current due to load torque in the three-phase period. The theoretical basis of the algorithm and individual definition of the control block is explained. The simulation results through traditional and proposed method show that the proposed algorithm reduces the torque ripple significantly.
선박 동적 모델을 고려한 하이브리드 RDP 시스템의 운영 제어 알고리즘 개발
김성안(Sung-An Kim) 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.
교류 입력 전압 변동에 따른 사이리스터 듀얼 컨버터의 출력 특성 개선을 위한 알고리즘 개발
김성안(Sung-An Kim),한성우(Sung-Woo Han),조윤현(Yun-Hyun Cho) 대한전기학회 2017 전기학회논문지 Vol.66 No.9
Electric energy is consumed or regenerated according to an operation of electric rail cars in urban railway power substations. A thyristor dual converter system is used to deal with the electric energy. Since the AC input voltage of power substations is 22.9kV ± 10%, the magnitude of the AC voltage fluctuates according to load conditions, so the secondary side voltage of the DDY transformer also fluctuates. In the thyristor dual converter, the response characteristics of the DC output voltage and the DC output current are changed based on an initial firing angle in the cross mode conversion between the forward mode and the reverse mode. Therefore, this paper proposes the initial firing angle tracking algorithm considering fluctuation of the AC input voltage. The effectiveness of the proposed algorithm is verified by a simulation compared with the conventional algorithm.