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선체 교류 전자장 제거를 위한 능동 축 접지 시스템 설계
김태규,안호균,윤태성,박승규,곽군평,Kim, Tae-kue,Ahn, Ho-kyun,Yoon, Tae-sung,Park, Seung-kyu,Kwak, Gun-pyong 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.6
최근 선박의 부식을 방지할 목적으로 전기적인 방식 장치를 이용하여 선체와 프로펠러의 부식을 방지하는 장치가 많이 이용되고 있는 추세이다. 그러나 전기적 방식 방법은 선체 내부의 전원장치에 의해 선체 주위의 해수로 전류를 방사하여 선체와 프로펠러가 부식이 되지 않는 상태로 인위적으로 만들어 주는 방법을 사용하는데, 해수에 방사되는 방식전류로 인하여 선체 외부에서 전자장 신호가 발생하게 된다. 본 논문에서는 선체 외부의 수중에서 발생하는 전자장 신호를 분석하고, 이에 대한 감소 대책에 대한 연구를 수행하는 것을 목표로 하였다. 기존의 축 접지 시스템에서는 축 전위가 100[mV] 이상 이며, 교류 전류 성분이 전체의 10% 이상을 차지하였으나, 본 논문에서는 방식전류내에서 교류전자장을 발생하는 교류 전류 성분과 축 전위가 각각 1% 와 2[mV]이내로 유지되게 하는 제어 시스템을 설계하고, 모의 실험을 통하여 그 성능을 입증하였다. Recently, for the purpose of preventing the corrosion of a vessel, the electrical corrosion protection device that prevents the corrosions of the hull and the propeller is widely used. However, the electrical corrosion protection method artificially emits the current into the seawater around the hull using the power supply in order to make the hull and propeller be in the state of not being corrosion, so that electromagnetic field is generated outside the hull by the current emitted into the seawater. In this paper, the static and alternating constituents of the electromagnetic field generated in underwater outside the hull are analyzed and a countermeasure is investigated to reduce the strength of the electromagnetic field. In conventional shaft grounding system, the shaft potential is maintained above at least 100mV and the alternating current component constitutes more than 10% of the total current. However, in this paper, a control system was designed in order that the alternating current component and the shaft potential which generate electromagnetic field are maintained within 1% and 2mV respectively, and the performance was verified by simulation.
Al-Mg합금의 압연변수에 다른 미세구조의 변화와 고온인장특성
김태규,전채홍,권숙인,박종우 ( Tae Kue Kim,C . H . Jeon,S . I . Kwun,Jong Woo Park ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.2
The effect of alloying elements, precipitate size, its distribution, and dislocation substructure resulted from warm rolling or cold rolling in the superplastic Al-Mg alloy system was investigated. One of the major requirements for fine structure superplasticity is that the grain size should be very small. Fine grain structure is controlled by the dislocation substructure and the dynamic recrystallization during hot or warm working. The recovery of Al-Mg base alloys was constrained resulting in relatively high dislocation density when the alloys were warm rolled. In particular, Al-Mg-Zr alloy exhibited the smallest sub-grain size among Al-Mg alloys containing Mn, Cu, Zr as a third element. The Al-Mg-Mn alloy cold rolled 80% after hot rolling showed the maximun strain rate sensitivity exponent, m, of 0.75 under strain rate of 7.1×10^(-4)/s at 500℃. The elongation of the alloys was limited in spite of high m values due to large dispersoids containing appreciable amount of Fe impurities.
개선된 평균 전류 제어 방식 역률 개선 회로의 제어에 관한 연구
김태규(Tae-Kue Kim),김태우(Tae-Woo Kim),최현의(Hyun-Eui Choi),김민찬(Min-Chan Kim),안호균(Ho-Kyun Ahn),윤태성(Tae-Sung Yoon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
The purpose of this paper is a study on the control of Power Factor Correction circuit by advanced average current control. The international standard organizations have made an effort to resolve these problems caused by the harmonics and announced the international standards for limiting the harmonic currents of the electrical devices and products. For improving power factor and reducing harmonics, many studies are progressed rapidly. In this study, we explain a method of an advanced average current control. And then, the performances of the PFC circuit applying a advanced average current control method are simulated and verified by Matlab/Simulink.
T-S 퍼지모델을 이용한 이산 시간 비선형계통의 상태 궤환 선형화
김태규(Tae Kue Kim),왕법광(Faguang Wang),박승규(Seung Kyu Park),윤태성(Tae Sung Yoon),안호균(Ho Kyun Ahn),곽군평(Gun Pyong Kwak) 한국지능시스템학회 2009 한국지능시스템학회논문지 Vol.19 No.6
본 논문은 이산 시간 비선형 시스템을 이산 시간 T-S 퍼지 모델에 의해 표현되는 새로운 궤환 선형화에 대해서 논한다. T-S fuzzy 모델의 국부적인 선형 모델들은 각각 가제어 표준형으로 변환되어지고, 그것들의 T-S 퍼지 결합은 궤환 선형화 가능한 T-S fuzzy 모델이 된다. 이 모델을 토대로 비선형 상태 궤환 선형 입력이 결정된다. 비선형 상태 변환은 가제어 표준형에 대한 선형 상태 변환으로부터 추론된다. 본 논문에서 제안하는 방법은 충분한 수학적 배경이 요구되는 고전적인 궤환 선형화 기법과 비교하여 수학적으로 보다 직관적이고 이해하기 쉽다. 본 논문의 궤환 선형화 조건은 고전적인 궤환 선형화와 비교하여 더 완화되었다. 이것은 고전적인 선형화방식 보다 더 큰 범주의 비선형 시스템이 선형화가 가능해진다는 것을 의미 한다. In this paper, a novel feedback linearization is proposed for discrete-time nonlinear systems described by discrete-time T-S fuzzy models. The local linear models of a T-S fuzzy model are transformed to a controllable canonical form respectively, and their T-S fuzzy combination results in a feedback linearizable Tagaki-Sugeno fuzzy model. Based on this model, a nonlinear state feedback linearizing input is determined. Nonlinear state transformation is inferred from the linear state transformations for the controllable canonical forms. The proposed method of this paper is more intuitive and easier to understand mathematically compared to the well-known feedback linearization technique which requires a profound mathematical background. The feedback linearizable condition of this paper is also weakened compared to the conventional feedback linearization. This means that larger class of nonlinear systems is linearizable compared to the case of classical linearization.
GaN FET를 이용한 동기식 DC-DC 컨버터 구동 기법에 관한 연구
김태규(Tae-Kue Kim),안호균(Ho-Gyun Ahn) 대한전기학회 2019 전기학회논문지 Vol.68 No.2
Recently, there have been many studies on power conversion systems using GaN devices. In particular, in the system of below 600V, GaN has a beneficial advantages over the SiC device. However, due to the characteristics of the GaN device, the parasitic capacitance and the threshold voltage are low, it is difficult to obtain an increase in efficiency even when a GaN device is substituted for a system using Si semiconductor due to ringing and faulty turn on. Especially, high frequency noise is often included in the PWM output stage of the IC due to the characteristics of the internal circuit. This noise affects the switching output and reduces the efficiency in the system which the GaN device is applied. In this paper, as one of the methods to solve this problem, we propose a method of analyzing PWM high frequency noise and removing it. In addition, we have been studied a method for improving the time delay caused by the added circuit, by using dead time and delay time compensation. The results of this paper are expected to be used as a method to improve efficiency when driving GaN devices.
TBM용 대용량 전동기의 기동 특성 및 개선 관한 연구
김태규(Tae-Kue Kim),안준영(Joon-Young An) 대한전기학회 2019 전기학회논문지 Vol.68 No.1
Tunnel Boring Machine’s Technology has depends mostly on imports, currently domestic technology development was proceeding. There are many technologies in this field, above all, the large-capacity motor drive technology required for excavation is one of the core technologies. In particular, when several large motors are simultaneously starting, there are many problems due to a large starting current at that time, and it is difficult to design and operate a power receiving facility. In this paper, A method of reducing the starting current by using the regenerative power generated by the deceleration of the motor has been studied. To verify this proposal, we designed the induction motor controller using CAE based power simulation tool and verified the results of the proposed method by applying the reduced model. As a result, it is possible to reduce the maximum starting current and shorten the start-up time. Moreover, even if several motors are connected to one bank, it is proved that the method can be efficiently operated by using the sequential braking / starting sequence. In the case of a power system in which a large capacity electric motor such as a tunnel excavation system is driven, the results of this study are expected to be a stable and effective method for solving the start-up current problem and designing the power receiving facility.
조종 반력 시스템에서의 액츄에이터 제어 파라미터 조정에 관한 연구
윤태성(Tae-Sung Yoon),박승규(Seung-Gyu Park),박준호(Joon-Ho Park),김태규(Tae-Kue Kim) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
In this study, a systematic and effective tuning method of the actuator control parameters of the control loading system for aircraft based on control theory is presented. Firstly, to raise the time response of the system, the proportional gain and the integral gain of the velocity control loop is maximized within the range where vibration and noise does not occur. And then the position control loop is composed by getting the transfer function of the control loading system including the velocity control loop. With the root locus of the composed position control loop, the proportional gain of the position control loop that keeps stable transient state and leads good time response of the system is predicted, and the simulations are performed by using the predicted gain. Lastly, the actuator control parameters of actual control loading system are set to the previously obtained gain values. And the experiments to actuate the control loading system are executed. It shows that the tuning method of the actuator control parameter proposed in this study is applied to actual control loading system very well by comparing the results of the experiments with those of the simulations.