Novel carrier‐based hybrid pulse width modulation method for cascaded capacitor‐clamp multilevel inverter

Kim, Ki-Mok; Choi, Won-Seok; Park, Ki-Hyeon

doi:10.1049/iet-pel.2014.0035

Cited by 24 publications

(8 citation statements)

References 14 publications

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“…Using Fourier series expansion, the analytical solution for digital CPS-PWM, u osi (t) can be derived as in (10). Equation (10) can be solved by (8), (9), and Bessel's function of first kind and it can be written as in (11); where m and p are base band and side band index, respectively; the value of γ and φ are defined in (12) and (13), respectively (see (10))…”

Section: Digital Cps-pwm Of Multilevel Vsimentioning

confidence: 99%

Time‐domain characterisation of multicarrier‐based digital SPWM of multilevel VSI

Kumar¹,

Gupta²

2018

IET Power Electronics

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The effect of sampling frequency on digital sinusoidal pulse width modulated (SPWM) output of phase-shifted carrierbased multilevel voltage source inverter (VSI) and the characteristics of output voltage and load current has been discussed here. The generalised equation of digitally controlled phase-shifted carrier-based multilevel VSI output voltage is derived using double Fourier integral solution. The Jacobi-Anger expansion has been used to obtain the integral solution. Time-domain analysis has been used to establish the relation between sampling frequency, carrier frequency, and fundamental frequency, at different modulation indices for n-level VSI. The load current of VSI is stepped in nature due to stepped variation in the output of the digital SPWM. Therefore, the low-frequency harmonic components closer to the fundamental frequency appear in the frequency spectrum. The variation of total harmonic distortion with respect to multisampling factor (sampling to carrier frequency ratio) has been discussed at different modulation indices for multicarrier-based multilevel inverter. The analytical results are verified through simulation and laboratory experimental results.

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Section: Digital Cps-pwm Of Multilevel Vsimentioning

confidence: 99%

Time‐domain characterisation of multicarrier‐based digital SPWM of multilevel VSI

Kumar¹,

Gupta²

2018

IET Power Electronics

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“…The performance in terms of line-to-line voltage and current waveforms are analysed. Kim et al [19] have implemented a new carrier-based hybrid PWM scheme for the cascaded capacitor-clamp multilevel inverter that combines the benefits of an alternative level shifted carrier PWM and a phase-shifted carrier PWM. This method enables to achieve a balanced load sharing between cascaded cells even at low amplitude modulation indices as well as the excellent voltage balancing control of the flying capacitors with a much smaller voltage ripple and the good harmonic characteristics in output waveform.…”

Section: Research Articlementioning

confidence: 99%

Intensive random carrier pulse width modulation for induction motor drives based on hopping between discrete carrier frequencies

Sivarani¹,

Jawhar²,

Kumar³

2016

IET Power Electronics

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The existing random carrier pulse-width modulation (RCPWM) schemes result in poor non-deterministic characteristics. They basically use a single-frequency triangular carrier and its inverted version to synthesise the random carrier by a pseudo-random binary sequence (PRBS) bit selector. Even though the bits are highly random in nature with large pattern repetition rate, the resulting random carrier does not possess required level of randomness. Rather it can make slight positional variation in the resulting PWM pulses. Moreover, the harmonic spreading effects of these randomness may not be sufficient to meet the expectations of modern drives. Hence, this study proposes a multiple carriers based RCPWM (MCBRCPWM) scheme for the voltage-source inverter fed induction motor drive to enhance the harmonic power spreading ability of the modulator. The proposed MCBRCPWM scheme utilises the nondeterministic characteristics of both the PRBS and hopping action between the MCs involved. The simulation results using MATLAB 7.1.0 (2010a)-Simulink software and the experimental results with hardware implemented using XC6SLX45 field programmable gate array for a 3Ø squirrel cage induction motor load prove the excellent harmonic spectra spreading capability of the proposed scheme as compared with existing non-deterministic methods.

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“…Once the topology of the multilevel inverter is specified, a proper modulation method is critical, which determines the output performance such as waveform quality and efficiency [17–19]. Modulation methods such as space vector pulse‐width modulation (PWM), carrier disposition modulation, and carrier phase shift modulation have been designed for multilevel inverters [18, 20, 21]. More specifically, for space vector PWM technology, as the output voltage levels increase, the number of basic vector and the choice of the redundant states are relatively complex, which are not suitable for 7L inverter.…”

Section: Introductionmentioning

confidence: 99%

Seven‐level inverter with switched capacitors

Zhao

et al. 2018

J. eng.

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Novel carrier‐based hybrid pulse width modulation method for cascaded capacitor‐clamp multilevel inverter

Cited by 24 publications

References 14 publications

Time‐domain characterisation of multicarrier‐based digital SPWM of multilevel VSI

Time‐domain characterisation of multicarrier‐based digital SPWM of multilevel VSI

Intensive random carrier pulse width modulation for induction motor drives based on hopping between discrete carrier frequencies

Seven‐level inverter with switched capacitors

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