Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times

Murai, Yuichi; Watanabe, Tomofumi; Iwasaki, Harumitu

doi:10.1109/tia.1987.4504998

Cited by 273 publications

(84 citation statements)

References 2 publications

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“…The switching leg time is averaged over an entire cycle and added to the voltage reference [6], [7]. A pulse-based method [8] compensates the dead time for each PWM pulse.…”

Section: A Open Loop Methodsmentioning

confidence: 99%

“…The compensation methods of the dead time effects for the Y-connected 3-phase machine have already been suggested in many technical literatures [6]- [17]. The average value of the lost voltage calculation [6], [7], the PWM pulse based method [8], the voltage feed forward method [9]- [13], the phase angle calculation method [14], the disturbance observer method [15], [16], and the support vector regression (SVR) method [17] are the main categories of the conventional dead time compensation methods. However, these methods are based on the Y-connected three-phase machine and have drawbacks such as parameter dependency and complexity.…”

Section: Introductionmentioning

confidence: 99%

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A Dead Time Compensation Algorithm of Independent Multi-Phase PMSM with Three-Dimensional Space Vector Control

Park¹,

Park²,

Bae³

et al. 2013

Journal of Power Electronics

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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.

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“…The switching leg time is averaged over an entire cycle and added to the voltage reference [6], [7]. A pulse-based method [8] compensates the dead time for each PWM pulse.…”

Section: A Open Loop Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Dead Time Compensation Algorithm of Independent Multi-Phase PMSM with Three-Dimensional Space Vector Control

Park¹,

Park²,

Bae³

et al. 2013

Journal of Power Electronics

View full text Add to dashboard Cite

show abstract

“…Since an accurate voltage control is essential to accomplish low-frequency operation and, as mentioned earlier, an accurate synthesis of a reduced output voltage is limited by the nonlinear behavior of a PWM-VSI [8]- [10, [19], it is necessary to provide some means of compensation. The main effects that need to be compensated for are the dead time and the voltage drop across the switches.…”

Section: Inverter Nonlinearitymentioning

confidence: 99%

“…In addition, the nonlinear behavior of the modern pulsewidth modulated voltage-source inverter (PWM-VSI) in the low voltage range [8]- [10] makes it difficult to use constant V/f drives at frequencies below 3 Hz [11].…”

mentioning

confidence: 99%

A new induction motor V/f control method capable of high-performance regulation at low speeds

Munoz-Garcia

Lipo

Novotny

1998

IEEE Trans. on Ind. Applicat.

162

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Abstract-A novel open-loop speed control method for induction motors that provides high output torque and nearly zero steady-state speed error at any frequency is presented. The control scheme is based on the popular constant volts per hertz (V/f) method using low-cost open-loop current sensors. Only stator current measurements are needed to compensate for both stator resistance drop and slip frequency. The scheme proposed fully compensates for the current-resistance (IR) voltage drop by vectorially modifying the stator voltage and keeping the magnitude of the stator flux constant, regardless of changes in frequency or load. A novel slip frequency compensation, based on a nonlinear torque-speed estimate, is also introduced. This method reduces the steady-state speed error to almost zero. It is also shown that a linear torque-speed approximation is a special case of the nonlinear estimate and that it leads to large speed errors for loads greater than rated. It is shown that, by using the proposed method, the speed can be accurately controlled down to, at least, 1.2 Hz with load torques of more than 150% of rated value. Since the only machine parameter required, the stator resistance, is automatically measured at startup time, using the same pulsewidth modulated voltage-source inverter without additional hardware, the proposed drive also exhibits self-commissioning capability.

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“…This is because deadtime voltage errors increase with the switching frequencies. Therefore, there is a trade-off relationship between the two ripples (10) .…”

Section: Introductionmentioning

confidence: 99%

Torque Ripple Suppression Method with Multilevel Inverter and Feedforward Dead-Time Compensation

2016

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This paper discusses the suppression of torque ripples in motor drives. Current ripples caused by pulse-width modulation with frequencies of 10-100 kHz can be reduced by using high-frequency switching. On the other hand, current ripples caused by dead-times with 6kth-order ripples of fundamental frequencies increase with the switching frequency. Therefore, there is a trade-off relationship between the two ripples. To compensate for dead-times, feedforward compensation is widely used. However, effective compensation cannot be achieved if the feedforward compensation values contain modeling errors. This paper therefore reveals that the robustness of the output torque against compensation errors can be improved by using multilevel inverters. The proposed method is validated through simulations and experimental results.

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Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times

Cited by 273 publications

References 2 publications

A Dead Time Compensation Algorithm of Independent Multi-Phase PMSM with Three-Dimensional Space Vector Control

A Dead Time Compensation Algorithm of Independent Multi-Phase PMSM with Three-Dimensional Space Vector Control

A new induction motor V/f control method capable of high-performance regulation at low speeds

Torque Ripple Suppression Method with Multilevel Inverter and Feedforward Dead-Time Compensation

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