An Investigation on the Performance of Random PWM Controlled Converters

Jadeja, Rajendrasinh; Ved, Amit; Chauhan, Siddharthsingh K.

doi:10.48084/etasr.599

Cited by 17 publications

(6 citation statements)

References 68 publications

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“…Also, the variable switching frequency PWM (VSFPWM) scheme can predict the current ripple to reduce the electromagnetic interference (EMI) introduced by high-frequency components. [12] also suggests random PWM controlled converter to reduce the harmonics.…”

Section: Figure 3 3-phase Inverter Figure 4 Switch States Of Space Co...mentioning

confidence: 99%

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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Variable speed drives (VSDs) are widely utilized to control motors such as pumps, compressors, fans, etc. However, the endurance of motor winding insulation under repetitive voltage pulse excitation is weakened, resulting in premature failure and shortening the expected operating life. This article reviews the literature of investigations spanning the last two decades on the problem. Researchers have focused on different aspects to explain this from a particular angle. The precise mechanism is complicated as a number of interacting factors contribute to premature insulation failure. Insulation degradation in motors can be attributed to thermal, mechanical, chemical, and electrical stress. It seems that space charge accumulation and partial discharge (PD) are the two main influences; the former can exacerbate the electric stress distribution whilst the latter promotes insulation deterioration.

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Section: Figure 3 3-phase Inverter Figure 4 Switch States Of Space Co...mentioning

confidence: 99%

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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“…The control by conventional PWM control techniques of a grid-tied inverter also leads to the issue of carrier frequency and sideband harmonics [20]. These sideband harmonics are minimized by the Random PWM technique [21][22][23][24]. The Random PWM is achieved with random carrier frequency RCF PWM where the carrier frequency is varied over a range.…”

Section: Introductionmentioning

confidence: 99%

A random carrier frequency PWM technique with a narrowband for a grid-connected solar inverter

et al. 2020

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The quality of power is always a concern for the high penetration of a grid-connected solar photovoltaic (PV) system due to the variation in solar irradiation and the temperature change of solar output, which in turn varies the fundamental component of power delivered to the grid. A solar source requires an inverter interface to supply the AC load as well as for the grid interconnection. Any reduction in the fundamental component generated by solar PV at a lower irradiation level or at hightemperature results in increasing %THD at the output of inverter for a given fixed switching frequency since harmonics due to PWM technique is comparable with the fundamental component. The selection of high-fixed-switching-frequency PWM reduces harmonics but increases the stress on switches and switching losses. It also suffers from issues of harmonics at carrier frequency and its sideband at multiples of switching frequency that causes acoustic noise and EMI. The random frequency PWM (Random PWM) method overcomes these issues presented by the fixed-frequency PWM method. However, a wide band of Random PWM makes the inverter filter design difficult and causes resonance in the distribution system. In addition, asymmetry in the carrier wave introduces even-order harmonics in the line current. Hence, this paper proposes a narrowband random frequency PWM method to reduce sideband harmonics, lower-order harmonics, even-order harmonics and a total harmonic distortion (THD) for a solar-based grid-connected inverter. Simulation results present a satisfactory performance of the proposed control technique for a steady-state and transient results. Experimental validation of the same is carried out on the OPAL-RT OP4500-based laboratory prototype of a 2-kVA inverter which depicts reduction in harmonics and hence improvement in power quality. KeywordsGrid-connected inverter • Harmonics • Linear control • Random PWM • Solar inverter B Rajendrasinh Jadeja

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Section: Introductionmentioning

confidence: 99%

“…Several methods have been introduced to control DC-to-DC switching converters [1][2][3][4][5][6][7]. Common controllers employed in these converters include the PWM traditional controller based on current control or voltage control [1][2]. Design based on the averaging method from the state space based on the small signal method in these controllers will not bring about a proper dynamic performance in large-signal disturbances.…”

Section: Introductionmentioning

confidence: 99%

Application of Minimum-time Optimal Control System in Buck-Boost Bi-linear Converters

Shariatmadar

Jafarian

2017

Eng. Technol. Appl. Sci. Res.

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In this study, the theory of minimum-time optimal control system in buck-boost bi-linear converters is described, so that output voltage regulation is carried out within minimum time. For this purpose, the Pontryagin's Minimum Principle is applied to find optimal switching level applying minimum-time optimal control rules. The results revealed that by utilizing an optimal switching level instead of classical switching patterns, output voltage regulation will be carried out within minimum time. However, transient energy index of increased overvoltage significantly reduces in order to attain minimum time optimal control in reduced output load. The laboratory results were used in order to verify numerical simulations.

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An Investigation on the Performance of Random PWM Controlled Converters

Cited by 17 publications

References 68 publications

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

A random carrier frequency PWM technique with a narrowband for a grid-connected solar inverter

Application of Minimum-time Optimal Control System in Buck-Boost Bi-linear Converters

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