• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권9호
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• pp.618-625
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• 2000

Recently PWM inverters are widely utilized for many industrial applications e.g. high performance motor drive and PWM techniques are newly developed for an accurate output voltage. Among them space voltage vector PWM(SVPWM) inverter has high voltage ratio and low harmonics compared to the conventional sinusoidal PWM inverter. However output voltage of PWM inverter is distorted and has error duet o the conducting voltage drop of switching devices and the dead time that is inevitable to prevent the shoot-through phenomenon. This paper investigates 3-phase SVPWM inverter which has a new compensation method against dead time and voltage drop. Proposed algorithm calculates gate pulse periods which directly compensates the dead time and nonlinear voltage drop without modification of reference voltages. Direct compensation of gate pulse periods produces exact output voltage and does not need additional circuits. The propose algorithm is verified through the simulation and experiments.

• Journal of Power Electronics
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• 제2권1호
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• pp.55-66
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• 2002

A new on-line dead-time compensation method for a permanent magnet (PM) synchronous motor drive is proposed. Using a simple disturbance observer without any additional circuit and off-line experimental measurement, disturbance voltages in the synchronous reference dq frame caused by the dead time and non-ideal switching characteristics of power devices are estimated in an on-line manner and fed to voltage references in order to compensate the dead-time effects. The proposed method is applied to a PM synchronous motor drive system and implemented by using software of a digital signal processor (DSP) TMS320C31. Simulations and experiments are carried out for this system and the results well demonstrate the effectiveness of the proposed method.

• Earthquakes and Structures
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• 제24권1호
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• pp.1-9
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• 2023

A model for calculating structure interacted mechanics is proposed. A structural interaction model and controller design based on tuned mass damping (TMD) was developed to control the induced vibration. A key point is to introduce a new analytical model to evaluate the properties of the TMD that recognizes the motion-dependent nonlinear response observed in the simulations. Aiming at the problem of increased current harmonics and low efficiency of permanent magnet synchronous motors for electric vehicles due to dead time effect, a dead time compensation method based on neural network filter and current polarity detection is proposed. Firstly, the DC components and the higher harmonic components of the motor currents are obtained by virtue of what the neural network filters and the extracted harmonic currents are adjusted to the required compensation voltages by virtue of what the neural network filters. Then, the extracted DC components are used for current polarity dead time compensation control to avert the false compensation when currents approach zero. The neural network filter method extracts the required compensation voltages from the speed component and the current polarity detection compensation method obtains the required compensation voltages by discriminating the current polarity. The combination of the two methods can more precisely compensate the dead time effect of the control system to improve the control performance. Furthermore, based on the relaxed method, the intelligent approach of stability criterion can be regulated appropriately and the artificial TMD was found to be effective in reducing cross-wind vibrations.

• 전력전자학회논문지
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• 제9권3호
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• pp.267-274
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• 2004

본 논문에서는 새로운 온라인 데드타임 전향보상기법을 제안한다. 데드타임 효과(dead-time effect)로 인한 출력 전압 오차를 외란전압으로 간주하고 이를 추정하여 전향보상한다. 외란전압의 크기를 시간지연제어기법을 이용하여 추정하고, 추정된 값과 측정된 전류와 위치 정보로써 외란전압을 계산한다. 데드타임 효과를 보상하기 위해 계산된 외란전압은 전압지령에 전향된다. 제안된 방법은 DSP TMS320C31을 사용하여 디지털방식으로 영구자석 동기 전동기 구동 시스템에 적용이 된다. 제안된 방법의 효용성을 검증하기 위해 이 시스템에서 실험을 수행하였고 그 결과는 제안된 방법의 효과를 잘 보여주고 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 B
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• pp.976-978
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• 1999

Recently PWM invertor is broadly used for control of induction motor. The invertor is able to generate sin wave current from high speed switching power device such as IGBT. However the invertor is disturbed by dead time inevitably needed to prevent a short of the DC link voltage, and the dead time mainly causes distortions of the output current. In this Paper the dead time compensation method which corrects the voltage error from dead time, and Min Max algorithm enlarging the operating voltage of PWM were Proposed. This method can be implemented by software programming without any additional hardware circuit. The proposed algorithms were implemented by DSP(TMS320C31, 40MHz) and FPGA(QL2007, Quick Logic) described in VHDL. and applied to 3 phase induction motor(2.2 KW) to show the superior performance

• Journal of Power Electronics
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• 제13권1호
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• pp.77-85
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• 2013

This paper proposes a new dead time compensation method of independent six-phase permanent magnet synchronous motors (IS-PMSM). The current of the independent phase machines contains odd-numbered harmonics because of the dead time and the nonlinear characteristics of the switching devices. By using the d-q-n three-dimensional vector analysis, these harmonics can be extracted at the n-axis current. Thus, the current distortion can be compensated by controlling the n-axis current of the IS-PMSM to zero. The proposed method is simple and can be easily implemented without additional hardware setup. The validity of the proposed compensation method is verified with simulations and several experiments.

• 대한전기학회논문지
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• 제44권4호
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• pp.453-459
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• 1995

In this paper, a novel dead time compensation method is presented which produces inverter output voltages equal to reference voltages. An experimental result is also presented to demonstrate the validity of the proposed method. It shows that the compensation of the dead time is possible up to a sub-microsecond range. And the reference voltage can be used as a feedback value, which is essential for sensorless vector control and flux estimation. The method is based on space vector PWM strategy and can be carried out automatically by an inverter controller for initial set-up without any extra hardware.

• 전기전자학회논문지
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• 제26권2호
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• pp.271-279
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• 2022

본 논문은 플로팅 커패시터를 갖는 이중 인버터의 향상된 데드 타임 보상 기법을 제안한다. 플로팅 커패시터를 갖는 이중 인버터는 2-레벨 단일 인버터보다 전력 반도체가 6개가 추가된다. 전력 반도체의 수가 증가로 이중 인버터의 출력 전압은 추가된 전력 반도체의 도통 전압만큼 감소되며 출력 전류 품질은 전력 반도체에 의한 전압 강하와 데드 타임에 의해 저하된다. 본 논문에서 제안하는 기법은 이중 인버터의 데드 타임 및 전력 반도체의 도통 전압을 보상하여 전류 품질을 개선하고 추가적인 대역통과 필터를 이용한 고조파 보상 기법을 통해 데드 타임과 도통 전압 보상에 대한 오차를 추가 보상한다.

• 전력전자학회논문지
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• 제10권1호
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• pp.38-44
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• 2005

전압형 인버터에서 데드 타임은 직류단 단락을 방지하기 위하여 필요하다. 데드 타임 효과는 출력 전압, 출력 전류의 왜곡으로 나타난다. 최근 많은 논문에서 데드 타임 보상 방법에 대한 연구가 이루어졌다. 본 논문에서는 데드타임을 보상하는 것이 아니라 데드 타임이 없는 인버터를 제안한다. 부하전류를 측정할 필요도 없으며 데드 타임보상을 위한 계산도 필요 없다. 이는 인버터의 각 레그에 트랜스포머를 추가함으로써 가능하다. 제안된 방법의 각 모드 해석이 선행되고 타당성을 위한 시뮬레이션 결과가 제시된다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.252-255
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• 1999

A new dead-time compensation method using a disturbance observer is proposed. The dead-time causes the voltage distortion and it can be considered as the disturbance voltage. In this paper, the disturbance voltage is estimated by minimal order observer in the d-q frame and the estimated disturbance voltage is summed with voltage command by a feed-forward. The experiments are carried out for the DSP-based BLDC motor drive system and the results show the effectiveness of the proposed method.