A new design of selective harmonic elimination for adjustable speed operation of AC motors in mining industry

Luiz, Alex-Sander Amável; Filho, Braz J. Cardoso

doi:10.1109/apec.2017.7930756

Cited by 12 publications

(10 citation statements)

References 15 publications

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“…These challenges can be solved by adopting a technique that needs Jacobian matrix computation only at the start of the algorithm, and then Jacobian matrix in the subsequent iterations is estimated using previous iteration values. At the start of the algorithm, the initial values of different functions are obtained using (12) to (14).…”

Section: Optimum Pulse-width Modulation Solution By a Novel Methodsmentioning

confidence: 99%

“…Among various low-switching frequency PWM techniques, OPWM is widely investigated and researched for various industrial applications. [11][12][13][14][15][16][17][18][19][20] It is a preprogrammed PWM technique that selectively eliminates particular harmonics along with control of the fundamental voltage. [21][22][23][24][25][26] The Fourier series analysis of the output waveform is carried out, and set of nonlinear transcendental equations is obtained, which eliminates prespecified order of harmonics along with control of fundamental frequency voltage component.…”

Section: Introductionmentioning

confidence: 99%

“…In medium‐voltage and high‐power converters, low‐switching frequency PWM techniques are preferred as the switching losses are one of the most important criteria for its operation. Among various low‐switching frequency PWM techniques, OPWM is widely investigated and researched for various industrial applications . It is a preprogrammed PWM technique that selectively eliminates particular harmonics along with control of the fundamental voltage .…”

Section: Introductionmentioning

confidence: 99%

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Low-order harmonics control in staircase waveform useful in high-power application by a novel technique

Ahmad

Al‐Hitmi

Iqal

et al. 2018

Int Trans Electr Energ Syst

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Summary Few switching transition in high‐power and medium‐voltage application of power converters is desirable. The optimal pulse‐width modulation (OPWM) at fundamental switching frequency offers a better quality waveform at lower switching losses. It is a preprogrammed modulation technique where certain amounts of lower order harmonics are controlled and fundamental voltage is maintained. Here, a set of nonlinear transcendental equations is obtained, which exhibits multiple, unique, or no solution in different range of modulation index (MI). This paper proposes an advanced and fast method to obtain switching instants for OPWM equations. Moreover, it can solve a large number of such equations as computation of Jacobian matrix in the subsequent iteration is estimated from the previous values. Moreover, the proposed method also removes the singularity problem especially for large OPWM equations. The computational, simulation, and hardware results are provided to validate the concept for various cases.

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Section: Optimum Pulse-width Modulation Solution By a Novel Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-order harmonics control in staircase waveform useful in high-power application by a novel technique

Ahmad

Al‐Hitmi

Iqal

et al. 2018

Int Trans Electr Energ Syst

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“…In medium voltage and high power converters, low switching frequency PWM techniques are preferred as the switching losses are one of the most important criteria for its operation. Among various low switching frequency PWM techniques, SHE PWM is widely investigated and researched for various industrial applications [11][12][13][14], [15][16][17][18][19][20]. It is a pre-programmed PWM technique which selectively eliminates particular harmonics along with control of the fundamental voltage [21][22][23][24][25][26].…”

Section: Figure 1pulse Width Modulation Techniques For Multilevel Inmentioning

confidence: 99%

“…At the start of the algorithm, the initial values of different functions are obtained using (12) to (14).…”

Section: Switching Angles Computation By Fast Novel Approachmentioning

confidence: 99%

Low Order Harmonics Control in Stair Case Waveform by a Novel Estimation based Technique

Ahmad¹,

Iqbal²,

Ashraf³

et al. 2018

Preprint

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Few switching transitions in high power and medium voltage application of Power converters are desirable. The selective harmonics elimination (SHE) pulse width modulation offers a better quality waveform with lower switching transitions and hence lower switching losses. The SHE is a pre-programmed modulation technique where certain amounts of lower order harmonics are removed and fundamental voltage is controlled. After Fourier analysis of output waveform, a set of nonlinear transcendental equations is obtained which exhibits, multiple, unique or no solution in different range of modulation index (MI). In this paper, an iterative method based on the Jacobian estimate is proposed to solve a highly non-linear set of SHE equations. The proposed technique is easy in implementation and can solve a large number of such equations as computation of the Jacobian matrix in the subsequent iteration is estimated from the previous values.  Moreover, the proposed method also removes the singularity problem, especially for large SHE equations. High accuracy in the initial guess is also not essential for this method and can converge to the solution with any random initial guess. The computational and simulation results are given to validate the concept. The hardware result is provided to confirm the computational and simulation results.

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Comparative study between different optimisation techniques for finding precise switching angle for SHE‐PWM of three‐phase seven‐level cascaded H‐bridge inverter

Kundu

Burman

Giri

et al. 2018

IET Power Electronics

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Selective harmonic elimination pulse-width modulation (SHE-PWM) works at low-frequency switching, which reduces switching losses, device stress, and increases energy conversion efficiency. So, it can be an effective control strategy for multilevel inverter working on medium-voltage, high-power industrial energy conversion application. It provides desired output voltage by retaining the requested fundamental component as well as eliminating some low-order harmonics. The application of SHE-PWM in industries is having an influence on precise solvability of complex and non-linear equations. This study presents two recently reported optimisation techniques, namely backtracking search algorithm and differential search algorithm (DSA) for obtaining a more accurate solution of the harmonics elimination problem. The superiority of the proposed optimisation algorithms over the well known ancient algorithm such as genetic algorithm, BEE algorithm and particle swarm optimisation have been established by a comparative study with respect to the possibility of attaining global minima, the rank of convergence rate, and inverter performance analysis. Simulation and experimental results validate the efficacy of the DSA optimisation technique for calculating more precise switching angles that totally eliminate 5th-and 7th-order harmonics with fulfilling the requested fundamental component.

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A new design of selective harmonic elimination for adjustable speed operation of AC motors in mining industry

Cited by 12 publications

References 15 publications

Low-order harmonics control in staircase waveform useful in high-power application by a novel technique

Low-order harmonics control in staircase waveform useful in high-power application by a novel technique

Low Order Harmonics Control in Stair Case Waveform by a Novel Estimation based Technique

Comparative study between different optimisation techniques for finding precise switching angle for SHE‐PWM of three‐phase seven‐level cascaded H‐bridge inverter

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