New PWM Method for Fully Digitized Inverters

Murai, Yuichi; Ohashi, Kazuharu; Hosono, Isamu

doi:10.1109/tia.1987.4504999

Cited by 35 publications

(6 citation statements)

References 1 publication

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“…Pulsating torque or torque ripple is an important performance index in variable-speed AC motor drives operated with constant volts-per-hertz control [1]- [5], vector control [6], direct torque control (DTC) [7]- [15], or predictive control [16]- [21]. A major cause of the pulsating torque is the harmonic content in the output voltage of the voltage source inverter (VSI) employed in the various drives [3], [4], [22], [23].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the voltage harmonic spectrum, defined by the method of pulse width modulation (PWM), determines the peak-to-peak torque ripple in case of vector-controlled and open-loop drives [3], [4], [23]. Conventional space vector PWM (CSVPWM) is shown to reduce the torque ripple, compared to sine triangle PWM, on account of the equal division of null-vector-time [1], [3], [4]. This paper proposes a novel hybrid PWM technique which reduces the peak-to-peak torque ripple in each sub-cycle, compared to CSVPWM, in openloop and vector-controlled drives.…”

Section: Introductionmentioning

confidence: 99%

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Space-vector-based hybrid PWM technique to reduce peak-to-peak torque ripple in induction motor drives

Hari

Narayanan

2015

IEEE Trans. on Ind. Applicat.

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Constant volts-per-hertz induction motor drives and vector-controlled induction motor drives utilize pulse width modulation (PWM) to control the voltage applied on the motor. The method of PWM influences the pulsations in the torque developed by the motor. Space-vector-based approach to PWM facilitates special switching sequences involving division of active state time. This paper proposes a space-vector-based hybrid PWM technique which is a combination of the conventional and special switching sequences. The proposed hybrid PWM technique results in a lower peak-to-peak torque ripple than conventional space vector PWM (CSVPWM) at high speeds of an induction motor drive. Further, magnitude of the dominant torque harmonic due to the proposed hybrid PWM is significantly lower than that due to CSVPWM at high speeds of the drive. Experimental results from a 3.75kW sensorless vector-controlled induction motor drive under various load conditions are presented to support analytical and simulation results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Space-vector-based hybrid PWM technique to reduce peak-to-peak torque ripple in induction motor drives

Hari

Narayanan

2015

IEEE Trans. on Ind. Applicat.

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“…2) Frequency Modulation Moreover, we can further improve the results by varying the pulse period several times during each 60 degrees of the fundamental period. It has been demonstrated [21], [22], [23], [24], [25], [26] that a variation of the carrier (pulse) frequency with an increase around each 60-degrees sector's bisectrix and a relaxation around the active vectors would improve the current harmonic performance.…”

Section: B Reduction Of Radial Error At High Modulation Index 1) Memmentioning

confidence: 99%

An SD Card Flash-Memory-Based Implementation of a Multioptimal Three-Phase PWM Generator

Neacșu

Zheng

Lehman

2016

IEEE Trans. Power Electron.

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This paper demonstrates for the first time the use of a very large SD Card flash-memory to the design of a three-phase Pulse Width Modulation (PWM) generator and describes the hardware and software used for implementation. The new digital architecture differs from conventional counter-based implementation, and it follows a pre-programmed optimal PWM pattern that is read from memory with magnitude and phase as coordinates. This architecture allows the inclusion of multiple optimization criteria within the PWM pattern. This digital architecture becomes so valuable since the switching instants can be set in any conceivable manner, away from the rigid constraint of a repetitive sequence of states on each PWM period. Experimental results validate that the proposed new architecture allows simple and low cost implementation of complicated PWM patterns with harmonic reductions that could not otherwise be achieved for low cost.

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“…It is well known that the insertion of dead-time into the switching regime causes a number of undesirable effects on the output voltage of an inverter. A large number of papers have appeared in the literature, which analyse this problem and propose various minimisation techniques [1][2][3][4][5][6][7][8][9]. These papers have mostly concentrated on minimising the voltage distortion (and by implication the current distortion) for inverters being controlled using triangular wave PWM generation techniques.…”

Section: Introductionmentioning

confidence: 99%

Dead-Time Issues in Predictive Current Control

Summers

Betz

2004

IEEE Trans. on Ind. Applicat.

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Current control in inverter driven machine systems is arguably the most important part of the control system. If accurate and rapid current control is achieved then, given the correct reference currents, fast and accurate torque control can be achieved. Unfortunately the implementation of current control in power electronic systems is not ideal. Practical effects can have a significant influence on its performance. This paper examines one of these effects, dead-time, and considers the influence it has on the performance of Predictive Current Controllers (PCCs). The paper presents analysis that shows that PCC implicitly compensates for voltage loss due to dead-time. Also a modified PCC is introduced that reduces the zero current clamp problem caused by dead-time. Simulation and experimental results are presented to verify the analysis and confirm the performance of the new algorithm. 1 We are not considering the interactions that dead-time may have on the dynamic performance of a machine.

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New PWM Method for Fully Digitized Inverters

Cited by 35 publications

References 1 publication

Space-vector-based hybrid PWM technique to reduce peak-to-peak torque ripple in induction motor drives

Space-vector-based hybrid PWM technique to reduce peak-to-peak torque ripple in induction motor drives

An SD Card Flash-Memory-Based Implementation of a Multioptimal Three-Phase PWM Generator

Dead-Time Issues in Predictive Current Control

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