Research on hybrid SHEPWM based on different switching patterns

Jing, Tao; Maklakov, Alexander S.; Radionov, Andrey A.; Baskov, S. N.; Kulmukhametova, A.S.

doi:10.11591/ijpeds.v10.i4.pp1875-1884

Cited by 21 publications

(8 citation statements)

References 16 publications

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“…At the same time, increasing the switching frequency increases the low order harmonics due to increasing the number of dead-times per reference cycle [24]- [26]. So, variable switching frequency PWM (VSFPWM) techniques have been proposed for flexible PWM pulses generation, and for improving THD level and switching losses as well [27]- [33].…”

Section: Confined Band Vsfpwm For Dead-time Effects Mitigationmentioning

confidence: 99%

Mitigating the dead-time effects on harmonics spectrum of inverter waveform by the confined band VSFPWM technique

Attia

Seng

Freddy

et al. 2021

IJPEDS

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The dead-time is necessary to be inserted between the gates drive pulses of the two power electronic switches in a one leg of any inverter to avoid a short circuit in the leg and the DC supply as well. However, adding the dead-time increases the low order harmonics of the output voltage/current waveform of the inverter. This paper investigates the positive effects of decreasing the pulse width modulation (PWM) drive pulses number per fundamental period on the current low order harmonics. In addition, this paper evaluates the impact of the confined band variable switching frequency pulse width modulation (CB-VSFPWM) technique on inverter performance in terms of dead-time mitigating, and consequenctely lowering the low order harmonics. CB-VSFPWM technique reduces the total harmonic distortion (THD) levels in the inverter output current as well. Theoretical analysis of the CB-VSFPWM effectiveness in reducing the negative effect of the dead-time has explained in this study and confirmed by the MATLAB/Simulink simulation results.

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Section: Confined Band Vsfpwm For Dead-time Effects Mitigationmentioning

confidence: 99%

Mitigating the dead-time effects on harmonics spectrum of inverter waveform by the confined band VSFPWM technique

Attia

Seng

Freddy

et al. 2021

IJPEDS

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“…Based on empirical risk minimization theory, the learning process of the ELM requires only a single iteration. Unlike traditional learning algorithms, the ELM shows relatively smaller training error with smaller norm of weight [21]. This, in turn, leads to a better generalization performance [22].…”

Section: Extreme Learning Machinementioning

confidence: 99%

Corona fault detection in switchgear with extreme learning machine

Ishak¹,

Koh²,

Tan³

et al. 2020

Bulletin EEI

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Switchgear is a very important component in a power distribution line. Failure in a switchgear can lead to catastrophic danger and losses. In this research, a fault detection system is proposed with the implementation of Extreme Learning Machine (ELM). This algorithm is capable to identify faults in a switchgear by analyzing the sound wave generated. Experiments are carried out to investigate the performance of the developed algorithm in identifying Corona faults in switchgears. The performances are analyzed in time and frequency domains, respectively. In time domain analysis, the results show 90.63%, 87.5%, and 87.5% of success rates in differentiating the Corona and non-Corona cases in training, validation and testing phases respectively. In frequency domain analysis, the results show 89.84%, 83.33%, and 87.5% success rates in training, validation and testing phases respectively. It can thus be concluded that the developed algorithm performed well in identifying Corona faults in switchgears.

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“…Consider two signals, a triangular wave and a DC signal, acting as a carrier and modulating signals respectively as shown in Figure 1 (i). When the triangular signal [19] is compared with the DC signal such that, the magnitude of the triangular becomes equal to that of DC signal, then the output will be constant until it becomes less than the DC signal as shown in Figure 1 (ii) and (iii) respectively, acting as triggering pulses for controlled power electronic devices T 1 and T 2 as shown in Figure 2. The width of the pulses depends upon the magnitude of the DC signal.…”

Section: Modulation Indexmentioning

confidence: 99%

Modulation index effect on inverter based induction motor drive

Sharma

Anandh

Gao

2020

IJPEDS

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Due to a substantial increase in the use of inverter for numerous electrical appliances starting from domestics to industrial drives, an inverter may be directly connected to the power grid system. The dependency on an inverter has been increased over the years. Hence, the proper and efficient design of the inverter will lead to higher efficiency. One of the major challenges is the generation of suitable gate pulses for power switching devices, which in turn depends on the modulation index. The selection of proper modulation index will help in the production of the rated voltage. If the modulation index is less, the duration of on-time pulses will be less and hence, the device's conduction time is also less, thereby the output voltage of the inverter is reduced. A reduced voltage, when applied to an induction motor will have lower speed and even its performance will be sluggish. The speed of the motor improves when it is operated in a closed-loop for the same modulation index. This research paper tries to bring out the effect of modulation index on speed control of an induction motor based on an inverter for both open as well as closed-loop operation. The simulated results indicate that the modulation index in the vicinity to unity will provide rated voltage for the smooth operation of the motor.

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Research on hybrid SHEPWM based on different switching patterns

Cited by 21 publications

References 16 publications

Mitigating the dead-time effects on harmonics spectrum of inverter waveform by the confined band VSFPWM technique

Mitigating the dead-time effects on harmonics spectrum of inverter waveform by the confined band VSFPWM technique

Corona fault detection in switchgear with extreme learning machine

Modulation index effect on inverter based induction motor drive

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