• Journal of Electrical Engineering and Technology
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• 제13권3호
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• pp.1156-1165
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• 2018

This paper presents a detailed realization of direct torque controlled induction motor drive for elevator applications. The drive is controlled according to the well-known space vector modulated direct control scheme (SVM-DTC). As the elevator drives are usually equipped with speed sensors, flux estimation is carried out using a current model where two stator currents are measured and accurate instantaneous rotor speed measurement is used to overcome the need for measuring stator voltages. Speed profiling for a comfortable elevator ride and other supervisory control activities to provide smooth operation are also explained. The drive performance is examined and controllers' parameters are fine-tuned using MATLAB/SIMULINK. The blocks used for flux and torque estimation and control in the offline simulation are compiled for real-time using dSPACE Microlabox. The performance of the drive has been verified experimentally. The results show good performance under transient and steady state conditions.

• 전력전자학회논문지
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• 제19권2호
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• pp.184-193
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• 2014

This paper presents a high performance ZPE(zero-phase-error) speed controller for PMSM(permanent magnet synchronous motor) drives. A comparison study between conventional general purpose speed controller in modern industry fields such as PI, IP and 2-degree of freedom controller presented also. The proposed ZPE speed controller is found suitable for vector controlled PMSM drives in giving the high level of performance while maintaining the excellent response at the time of speed command changing. In MATLAB-based comparative simulation and experiment results with commercial drive system, the proposed method shows a superior control performance compared with the conventional speed controller widely-used.

• 전력전자학회논문지
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• 제9권1호
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• pp.81-87
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• 2004

본 논문에서는 세탁기, 에어컨과 같은 가전기기에 사용되는 인버터 구동 교류 전동기 구동 시스템의 EMI 특성해석 및 필터 설계 방법에 대하여 기술하였다. 먼저, 인버터 구동 교류 전동기 구동 시스템의 전도성 EMI 발생 및 전달 메커니즘에 대하여 분석하였고, 공통 및 차동모드 노이즈 분리 기법을 이용한 EMI 필터의 설계 방법을 제시하였다. 제시된 방법의 타당성을 검증하기 위해 PWM 인버터로 구동되는 유도 전동기 구동 시스템에 대한 실험을 수행하였고 EN55014 EMI 기준을 만족하는 결과를 얻을 수 있었다.

• Journal of Power Electronics
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• 제11권6호
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• pp.846-855
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• 2011

This paper proposes a control mode switching scheme between vector control and constant V/f control for induction machine (IM) drives for maximum torque utilization in a higher speed region. For the constant V/f scheme, a smooth transition method from the linear range of PWM up to the six-step mode is applied, by which the machine flux and torque can be kept constant in a high-speed range. Also, a careful consideration of the initial phase angle of the voltage in the transient state of the control mode change between the vector control and V/f schemes is described. The validity of the proposed strategy is verified by the experiment result for a 3-kW induction motor drives.

• 전력전자학회논문지
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• 제1권1호
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• pp.1-6
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• 1996

Recent trends of the power electronic industry in China have been summarized in this paper. Based on the applications of the power electronic products in the chinese industries the production trends of power semiconductor devices, drives, power supplies, power electronic industry used in power systems in China have been briefly reviewed.

• 전력전자학회논문지
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• 제6권1호
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• pp.27-33
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• 2001

본 연구에서는 독립형 TMS32OC31 DSP보드에 의해 전략분석 과정을 완전 소프트웨어화하고, 전압센서와 전류 센서를 시스템 내부에 탑재한 저전력용 3상 모터구동장치플 위한 전랙품질 분석시스템을 개발하였다. 평균전력이 론에 의해 전략품질을 분석하였고 분석 결과를 LCD화변에 의해서 실시간으로 출력하였다. 특히 개발된 시스템은 설치공간이 필요한 종전의 대전력용 전력분석장비와는 다르게, 상용 인버터에 곧바로 탑재 가능하도록 히여 설치 공간을 줄였고 또한 초보자도 사용하기 용이하게 하였다. 정상상태와 모터구동장치의 부하가 급변하는 과도상태에 서도 제안된 전력품질 분석시스템은 실시간으로 전력분석을 하였으며, 본 연구의 유용성을 엽증할 수 있었다.

• Journal of Power Electronics
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• 제7권4호
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• pp.271-277
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• 2007

In this paper, an induction motor rotor fault diagnosis system using current signals, which are measured using the axis-transformation method is presented. Inverter-fed motor drives, unlike line-driven motor drives, have stator currents which are rich in harmonics and therefore fault diagnosis using stator current is not trivial. The current signals for rotor fault diagnosis need precise and high resolution information, which means the diagnosis system demands additional hardware such as a low pass filter, high resolution ADC, an encoder and additional hardware. Therefore, the proposed axis-transformation method is expected to contribute to a low cost fault diagnosis system in inverter-fed motor drives without the need for any additional hardware. In order to confirm the validity of the developed algorithms, various experiments for rotor faults are tested and the line current spectrum of each faulty situation, using the Park transformation, is compared with the results obtained from the FFT(Fast Fourier Transform).

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.146-150
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• 2001

A new three-phase soft-switching active front-end inverter is presented. The topology consists of a quasi-resonant PWM boost converter with an additional resonant branch, which provides low loss at high frequency operation. This leads to a high conversion efficiency and a remarkable reduction in the size of the input inductor. To synchronise the PWM pattern with the resonance cycle, a modified space vector modulation with asymmetrical PWM pattern is used. A high power factor can be achieved for both power flow directions. Due to a new control strategy the converter features a low content of harmonics in the line currents even for distorted line voltages.

• 전력전자학회논문지
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• 제8권1호
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• pp.40-47
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• 2003

A low-cost current-sensing scheme for the motor drives with MOSFET is described. Many motor drives usually employ the common current sensors to measure current for the purpose of control or protection. These current sensors, however, significantly burden the power circuit with the size and cost. The proposed current-sensing scheme utilizes information concerning MOSFET's On-voltage and On-resistance. An analogue circuit detecting On-voltage can overcome the above disadvantages because the circuit is small and is made at a low cost, and the fuzzy inference for On-resistance is also simply designed based on MOSFET's characteristics. The validity of this scheme will be experimentally verified by adopting the current control of a battery car.

• 전력전자학회논문지
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• 제24권2호
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• pp.120-126
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• 2019

This study proposes a neutral voltage balance control scheme for stable fault-tolerant operation of an active neutral point clamped (ANPC) inverter using carrier-based pulse width modulation. The proposed scheme maintains the neutral voltage balance by reconfiguring the switching combination and modulating the reference output voltage in order to solve the degradation of the output characteristic in the fault tolerant operation due to the fault of the power semiconductor switch constituting the ANPC inverter. The feasibility of the proposed control scheme is confirmed by HIL experiment using RT-BOX.