A Review of Spread-Spectrum-Based PWM Techniques—A Novel Fast Digital Implementation

Gamoudi, Rabiaa; Chariag, Dhia Elhak; Sbita, Lassaâd

doi:10.1109/tpel.2018.2808038

Cited by 101 publications

(56 citation statements)

References 71 publications

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“…The comparison between Equation (10) and Equation (1) shows that the calculation of T n+1 with the method in this paper is simpler than the method in [22]. In addition, there is no need to calculate D n+1 .…”

Section: Calculation For Switching Cyclementioning

confidence: 93%

“…The calculation of the switching cycle T n+1 is very significant in the RPWM selective harmonic elimination method. The formula for T n+1 and its corresponding pulse position in [22] are shown in Equation (1) and Figure 2a, where D n and D n+1 are the duty ratios of the nth and (n+1)th switching cycles, k is the random number, f 0 is the frequency to be eliminated, and T n is the nth switching cycle.…”

Section: Strategy Of Selective Harmonic Elimination In Rpwmmentioning

confidence: 99%

“…Random pulse width modulation (RPWM) is an effective method to suppress the electromagnetic interference (EMI) and the electromagnetic vibration and noise of the load [1]. As shown in Figure 1, RPWM can mainly be classified as 1) random switching frequency pulse width modulation (PWM) [2], 2) random pulse position PWM, 3) random switching PWM [3], 4) or hybrid random PWM [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

Liu

et al. 2020

Electronics

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In the existing random pule width modulation (RPWM) selective harmonic elimination methods, the formula of switching cycle TN+1 is complex, and the duty ratio DN+1 of the next switching cycle needs to be calculated in advance. However, in the case of unknown TN+1, DN+1 is also difficult to calculate accurately, and the two parameters are based on each other. A novel selective harmonic elimination method in RPWM is proposed in this paper. The PWM voltage pulse is placed at the back of the switch cycle, which simplifies the formula of the switch cycle TN+1 and eliminates the need to calculate the duty ratio DN+1. Two kinds of RPWM selective harmonic elimination ideas are summarized. The general formulas of the switch cycle, the effective random number k, and the upper and lower limits of switch frequency corresponding to k are derived. The spectrum shaping of inverter output voltage can be realized without using digital filter in this method. Simple algorithm, small calculation and easy implementation are characteristics of the proposed method. The simulation and experimental results confirm the ability of the proposed method for reducing harmonics at the specific frequency in power spectral density (PSD).

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Section: Calculation For Switching Cyclementioning

confidence: 93%

Section: Strategy Of Selective Harmonic Elimination In Rpwmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

Liu

et al. 2020

Electronics

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“…Compared with the most widely used constant switching-frequency PWM (CSFPWM) method, the variable switching-frequency PWM (VSFPWM) method can use the added freedom of switching frequency to optimize the related performance of power electronic converters [7] . The switching-frequency variation can be based on two major groups of principles: random and periodic variations.…”

Section: Introductionmentioning

confidence: 99%

Periodic variation in the effect of switching frequency on the harmonics of power electronic converters

Chen

Jiang

2020

Chin. J. Electr. Eng.

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Switching frequency is an important factor in the performance control of power electronic converters. It can help optimize switching losses, switching ripples and electromagnetic interference, especially for newly developed high-switching-frequency silicon carbide converters. Periodic variation in the switching-frequency methods has been developed for this purpose, especially the model-predictive variable switching-frequency pulse width modulation (VSFPWM) method. The effect of periodic switching-frequency variation on the harmonics of a converter using double Fourier analysis and simulations are investigated. This work verifies that the switching harmonics can be reduced by periodic variation in the switching frequency, and the low-frequency (baseband) harmonics only incur a slight change. The analysis provides a theoretical foundation for the application of VSFPWM in power electronic converters.

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“…The CFM schemes spread the power of the switching frequency harmonics to a certain frequency band to reduce the peak spectral power of the harmonics generated by the PWM and eventually, decrease the conducted EMI. CFM schemes include random modulation [9,10], chaotic modulation [11][12][13][14], and periodic modulation [15][16][17][18]. The modulated spectrum distributions between the random system and the chaotic system are similar because of the intrinsic randomness.…”

Section: Introductionmentioning

confidence: 99%

Suppressing Conducted DM EMI in an Active Power Filter via Periodic Carrier Frequency Modulation

Chen

Gao

et al. 2019

Energies

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Active power filters (APF) aim at solving the harmonic problem originated by the nonlinear load in power systems. However, the high dv/dt and di/dt outputs from power electronic devices in a voltage source converter on APF introduced unwanted conducted electromagnetic interference (EMI) when compensating for the low-frequency harmonic components. Hence, this paper develops a spectrum analysis approach to investigate and quantify the source differential-mode (DM) voltage of a single-phase shunt APF to suppress the DM EMI via periodic carrier frequency modulation (PCFM). In this scheme, the analytical expressions of source DM voltage in the APF using the PCFM scheme are obtained with a double Fourier series. In addition, the influence of PCFM parameters on the source DM voltage spectrum is predicted based on the analytical expression. As a result, the PCFM parameters, which have the best suppression effect on the DM EMI are obtained. The experiment results proved the validity of the sawtooth PCFM APF with the maximum frequency deviation equal to 800 Hz in alleviating the APF DM EMI.

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A Review of Spread-Spectrum-Based PWM Techniques—A Novel Fast Digital Implementation

Cited by 101 publications

References 71 publications

A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

A Novel RPWN Selective Harmonic Elimination Method for Single-Phase Inverter

Periodic variation in the effect of switching frequency on the harmonics of power electronic converters

Suppressing Conducted DM EMI in an Active Power Filter via Periodic Carrier Frequency Modulation

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