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자이로 구동기를 위한 자기베어링 구조의 토로이달 형 회전자 제어
주성탁(Sung-Tak Jou),이교범(Kyo-Beum Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.12
This paper deals with the position and torque control of a toroidal type rotor which has a magnetic bearing structure. The proposed magnetic bearing structure supports the rotor by the repulsive forces of permanent magnets, and has a two degree of freedom for rotor position when the rotor is rotating. Permanent magnets and coils in the stator allow for a two degree of freedom control of the rotor position and torque generation by reacting with permanent magnets of the rotor. The executed gyro actuator has a number of poles such as five-phase permanent magnet motors and 10 stator coils for the rotor position control. In this study, the verification of the stability of the magnetic bearing was conducted using the equation of motion when the rotor was rotating, and the coil current commutation method for the position control and torque generation was studied. As a result, the feasibility of the proposed structure and control was verified by simulations of Finite Element Method (FEM) and experiments using the executed gyro actuator.
플라즈마 방전장치 구동을 위한 전압 및 주파수 가변 전원장치 설계
주성탁(Sung-Tak Jou),정해광(Hae-Gwang Jeong),이교범(Kyo-Beum Lee) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문은 플라즈마 방전장치 구동을 위한 가변 전압/주파수 전원장치를 제안한다. 제안하는 전원장치는 가변전압을 위한 벅-부스트 컨버터와 주파수 변환을 위한 푸쉬-풀 인버터로 구성된다. 제안하는 전원장치의 벅-부스트 컨버터는 계통전류 고조파 저감과 DC링크 캐패시터 최소화를 위하여 PFC(Power Factor Collection)기법을 적용한다. 그리고 푸쉬-풀 인버터는 출력 변압기의 자기포화를 막기 위해 전류제한기법을 추가한다. 또한 불분명한 부하와 출력 트랜스의 공진 상황에서 전압 안정화를 위해 출력전압을 피드백하여 제어한다. 본 논문은 1[㎾]급 플라즈마 전원장치를 통하여 제안하는 토폴로지와 제어방법의 타당성을 검증한다.
주성탁(Sung-Tak Jou),이교범(Kyo-Beum Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.11
This paper intends to suggest a sensing circuit of PWM voltage for a motor emulator operated in the inverter. In the emulation of the motor using a power converter, it is necessary to measure instantaneous voltage at the PWM voltage loaded from the inverter. Using a filter can generate instantaneous voltage, while it is difficult to follow the rapidly changing inverter voltage caused by the propagation delay and signal attenuation. The method of measuring the duty of PWM using FPGA can generate output voltage from the one-cycle delay of PWM, while the cost of hardware is increasing in order to acquire high precision. This paper suggests a PWM voltage sensing circuit using the analogue system that shows high precision, one-cycle delay of PWM and low-cost hardware. The PWM voltage sensing circuit works in the process of integrating input voltage for valid time by comparing levels of three-phase PWM input voltage, and produce the output value integrated at zero vector. As a result of PSIM simulation and the experiment with the produced hardware, it was verified that the suggested circuit in this paper is valid.
이중여자 유도형 풍력발전기의 전력제어를 위한 스위칭 이득기반의 선형궤환제어기법
김원상(Won-Sang Kim),심경훈(Gyung-Hun Sim),주성탁(Sung-Tak Jou),김서형(Seo-Hyoung Kim),이교범(Kyo-Beum Lee) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
본 논문은 이중여자 유도형(DFIG) 풍력발전 시스템에서 유효전력과 무효전력을 직접적으로 제어하기 위해 가변구조제어의 일종인 스위칭 이득기반의 선형궤환(LFSG)제어기법을 제시한다. 개조된 직접전력제어기법 (DPC)과 공간벡터변조방식(SVM)은 제안하는 제어기법을 실현하기 위해 이용된다. 개조된 직접전력제어원리를 이용해서 설계된 LFSG제어기법은 널리 사용되고 있는 자속기준제어기법(FOC)에 비해서 간단한 제어구조로 강인성과 빠른 응답특성을 보인다. 시뮬레이션결과는 제안하는 제어전략의 타당성과 강인성을 확인해준다.
영구자석의 반발력과 코리올리 효과를 이용한 트로이덜 형 자이로의 설계
신혜웅(Hye-Ung Shin),주성탁(Sung Tak Jou),이교범(Kyo-Beum Lee),한만엽(Man Yop Han) 대한전기학회 2015 전기학회논문지 Vol.64 No.5
This paper deals with the design of 1-kW troidal type gyro. In general, gyro can be used as magnet bearing or flywheel energy storage device. The proposed troidal type gyro is used as a flywheel energy storage device. The gyro is capable of high-speed rotation in the air. The coriolis effect is taken into account when designing the rotor of the proposed gyro. Also the repulsive power of the permanent magnet is considered while selecting the shape and the thickness of the magnet. The neodymium is used as material of the magnets in this paper. The number of magnets are selected accordingly to reduce these torque ripples because torque ripples is an important factor while designing the gyro. The designed troidal type gyro is verified through the Finite Element Method (FEM).
전력 전향보상을 통한 동적전압보상기 직류단 전압 제어의 성능 향상
지균선(Kyun Seon Ji),주성탁(Sung Tak Jou),이교범(Kyo-Beum Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.9
This paper proposes a power feedforward technique for the performance improvement of DC-link voltage control in the dynamic voltage restorer (DVR). The DC-link Voltage is able to be unstable for an instant owing to any change in the load and voltage sag. The distortion of the DC-link voltage leads to the negative influence on the performance of DVR. To mitigate the distortion of the DC-link voltage, the power feedforward component is calculated by the load power and the grid voltage, and then it is added to the reference current of the conventional DC-link voltage controller. By including output power feedforward component on the DC-link controller, the DC-link voltage can settle down more quickly than when the conventional DC-link voltage controller applied. The proposed technique was validated through the simulation and experimental results.