http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Direct Power Control of a DFIG in Wind Turbines to Improve Dynamic Responses
Jou, Sung-Tak,Lee, Sol-Bin,Park, Yong-Bae,Lee, Kyo-Beum The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.5
This paper presents an implementation of a direct active and reactive power control for a doubly fed induction generator (DFIG), which is applied to a wind generation system as an alternative to the classical field-oriented control (FOC). The FOC has a complex control structure that consists of a current controller, a power controller and frame transformations. The performance of the FOC depends highly on parameter variations of the rotor and stator resistances and the inductances. The proposed direct power control (DPC) method produces a fast and robust power response without the need of complex structure and algorithms. One drawback, however, is its high power ripple during a steady state. In this paper, active and reactive power controllers and space-vector modulation (SVM) are combined to replace hysteresis controllers used in the original DPC drive, resulting in a fixed switching frequency of the power converter. Simulation results with the FOC and DPC for a 3kW DFIG are given and discussed, and the experimental results of a test involving identical machines are presented to illustrate the feasibility of the proposed control strategy.
Direct Power Control of a DFIG in Wind Turbines to Improve Dynamic Responses
Sung-Tak Jou,Sol-Bin Lee,Yong-Bae Park,Kyo-Beum Lee 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.5
This paper presents an implementation of a direct active and reactive power control for a doubly fed induction generator (DFIG), which is applied to a wind generation system as an alternative to the classical field-oriented control (FOC). The FOC has a complex control structure that consists of a current controller, a power controller and frame transformations. The performance of the FOC depends highly on parameter variations of the rotor and stator resistances and the inductances. The proposed direct power control (DPC) method produces a fast and robust power response without the need of complex structure and algorithms. One drawback, however, is its high power ripple during a steady state. In this paper, active and reactive power controllers and space-vector modulation (SVM) are combined to replace hysteresis controllers used in the original DPC drive, resulting in a fixed switching frequency of the power converter. Simulation results with the FOC and DPC for a 3kW DFIG are given and discussed, and the experimental results of a test involving identical machines are presented to illustrate the feasibility of the proposed control strategy.
Performance Improvement of a Bidirectional DC-DC Converter for Battery Chargers using an LCLC Filter
Sang-Ho Moon,Sung-Tak Jou,Kyo-Beum Lee 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.2
In this paper, a battery charger is introduced for an interleaved DC-DC converter with an LCLC filter. To improve the overall performance of the DC-DC converter for battery charger, a method is proposed. First, the structure of the system is presented. Second, an LC filter is compared to an LCLC filter in terms of the response characteristics and size. Third, the small-signal model of a bidirectional DC-DC converter using a state-space averaging method and the required transfer functions are introduced. Next, the frequency characteristics of the converter are discussed. Finally, the simulation and experimental results are analyzed to verify the proposed state space of the bidirectional converter.
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.
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.
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.
Performance Improvement of a Bidirectional DC-DC Converter for Battery Chargers using an LCLC Filter
Moon, Sang-Ho,Jou, Sung-Tak,Lee, Kyo-Beum The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.2
In this paper, a battery charger is introduced for an interleaved DC-DC converter with an LCLC filter. To improve the overall performance of the DC-DC converter for battery charger, a method is proposed. First, the structure of the system is presented. Second, an LC filter is compared to an LCLC filter in terms of the response characteristics and size. Third, the small-signal model of a bidirectional DC-DC converter using a state-space averaging method and the required transfer functions are introduced. Next, the frequency characteristics of the converter are discussed. Finally, the simulation and experimental results are analyzed to verify the proposed state space of the bidirectional converter.
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.
Direct Power Control of Three-Phase Boost Rectifiers by using a Sliding-Mode Scheme
Ju-Hye Kim,Sung-Tak Jou,Dae-Keun Choi,Kyo-Beum Lee 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6
This paper proposes a sliding-mode-based direct power control (DPC) method in a three-phase boost rectifier without the use of a voltage sensor. This sliding-mode-based DPC is used to improve transient-state response characteristics. This DPC can eliminate voltage sensors by calculating a voltage using a sensorless method, thus considerably reducing cost. This DPC first presents an effective algorithm that does not significantly affect the previous performance and does not need a voltage sensor. Thereafter, the effectiveness of the algorithm is verified by simulations and experiments.
Direct Power Control of Three-Phase Boost Rectifiers by using a Sliding-Mode Scheme
Kim, Ju-Hye,Jou, Sung-Tak,Choi, Dae-Keun,Lee, Kyo-Beum The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6
This paper proposes a sliding-mode-based direct power control (DPC) method in a three-phase boost rectifier without the use of a voltage sensor. This sliding-mode-based DPC is used to improve transient-state response characteristics. This DPC can eliminate voltage sensors by calculating a voltage using a sensorless method, thus considerably reducing cost. This DPC first presents an effective algorithm that does not significantly affect the previous performance and does not need a voltage sensor. Thereafter, the effectiveness of the algorithm is verified by simulations and experiments.