SHEPWM Based New Hybrid Multilevel Inverter Topology with Reduced Switch Count

Siddique, Marif Daula; Mekhilef, Saad; Shah, Noraisyah Mohamed; Momon, Mudasir Ahmed; Mustafa, Asif

doi:10.23919/epe.2019.8915580

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…In order to solve this nonlinear algebraic equation to obtain the unknown variable, many of the methods used in optimization solvers are proposed [27][28][29][30]. For the sake of generality and easy implementation for general microcomputers, a trust-region dogleg algorithm is employed in order to solve the SHEPWM equations [31,32].…”

Section: Programmed Pulse-width Modulation (Pwm)mentioning

confidence: 99%

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

et al. 2021

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The existing publications on the analysis of power quality indicators in modern electric power supply systems are void of a comprehensive approach to improving these indicators in power systems by implementing multipulse connections. To the authors’ knowledge, this paper is the first to analyze current harmonic distortions in an 18-pulse connection of three-level active front-ends (AFE) featuring a programmed PWM. Raw data were obtained from, and current quality was analyzed for the power circuit of the main electric drive actuating the rolls in the rolling stand of a plate mill. The key feature of such circuitry is that the synchronous motor of each work roll is connected to the grid with an 18-pulse connection that uses three phase-shift transformers, where the phase shifts are 0° (delta/delta), 20° (delta/polygon) and −20° (delta/polygon). The circuitry connects three frequency converters (FC) with the AFEs in parallel. Phase-shift transformers were found to periodically overheat in the process. When overheating occurred, a programmed PWM voltage waveform was applied where harmonics 17 and 19 were eliminated. The goal and objectives were to analyze why the transformer would overheat and to find out how the issue could be addressed. The authors developed a simulation model of the research object in order to assess power quality parameters. Simulation results obtained in Matlab/Simulink were used to estimate the total harmonic distortions (THD) and individual harmonic factors for up to the 50th secondary transformer winding and grid harmonic with four different programmed AFE PWM voltage waveforms. The results helped find the best such waveform to prevent phase-shift transformers from overheating; one with harmonics 5, 7, 17 and 19 eliminated. The experimental and mathematical modeling results in the paper were confirmed by positive effects after industrial implementation of the system. Research performed directly on the operating equipment has been classified by the company and is not publicly available. These results are highly versatile and could be used in similar research on other circuitries to ensure the electromagnetic compatibility of nonlinear power-consuming devices.

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Section: Programmed Pulse-width Modulation (Pwm)mentioning

confidence: 99%

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

et al. 2021

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“…The DLB converter is modified form of the step‐up boost converter. It consists of a coupled inductor, charge pump and active clamper circuits which are more complicated [12]. Here, the same method is adopted, show that the output voltage is twice greater than the input voltage source, but with the necessity of reducing module structure in the double‐lift boost circuit.…”

Section: Double‐lift Boost (Dlb) Convertermentioning

confidence: 99%

“…The reduction of the total harmonic distortion (THD) in MLIs requires resolution of complex non‐linear transcendental equations with a firefly algorithm (FA) is proposed Belkacem , et al [11]. MLI topology has been proposed with the basic unit requires three DC voltage sources and ten switches to synthesise 15 level across the load by Siddique , et al [12]. The symmetrical 15‐level MLI, Edwards and co‐authors [13] present the DC source magnitudes are equal and the results are verified in RL load condition both simulation and hardware approaches, which vertically routines a reference waveform to achieve the desirable multilevel output waveform.…”

Section: Introductionmentioning

confidence: 99%

Design and development of symmetrical super‐lift DC–AC converter using firefly algorithm for solar‐photovoltaic applications

Albert

Stonier²

2020

IET Circuits, Devices & Systems

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The super-lift technique is an exceptional contribution to DC-DC conversion technology. A replacement approach of symmetrical super-lift multilevel inverter (SLMLI) DC/AC technology is proposed with a reduced number of elements compared with the traditional multilevel inverter. In this method, the firefly algorithm conveys a leading task for the SLMLI topology for solar-photovoltaic applications. It generates low distortion output and consumes the harmonic band of the fast Fourier transform framework by the employment of the proposed algorithm. The simulation circuit for 15 levels output uses single switch super-lift inverter feed with different kinds of load (R, RL and RLE) conditions. The power quality is improved in SLMLI with minimised harmonics underneath the various modulation indices while varied from 0.1 up to 0.8. The circuit is designed in a fieldprogrammable gate array, which includes the firefly rule to help the multilevel output, to reduce the lower order harmonics and to find the best switching angle. As a result, the minimum total harmonic distortion from the simulation and hardware circuit is achieved. Due to the absence of bulky switches, inductor and filter elements expose the effectiveness of the proposed system.

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Selective harmonic elimination pulse width modulation based hybrid multilevel inverter topology with reduced components

Wasiq

Memon

Shrivastava

et al. 2022

IET Power Electronics

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In this paper, a reduced switch count single‐phase hybrid multilevel inverter (MLI) is presented. Level generation unit (LGU) and polarity changing unit (PCU) are the two parts of the presented topology which are connected in series. Other advantages of the proposed topology include the reduced switch count, higher level generation with reduced sources and the possibility of higher‐level generation with lower component counts. A single unit produces an output voltage of 13 levels with the modulation techniques as selective harmonic elimination pulse width modulation (SHEPWM) to improve harmonics. The use of selective harmonic elimination (SHM) is made to improve harmonics. The logical generation unit carries a series connection of multiple switched dc voltage sources with half and full‐bridge configurations. The proposed topology is verified by a hardware bench setup as well as in simulations which are developed in Simulink/MATLAB® environment.

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SHEPWM Based New Hybrid Multilevel Inverter Topology with Reduced Switch Count

Cited by 4 publications

References 16 publications

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

Design and development of symmetrical super‐lift DC–AC converter using firefly algorithm for solar‐photovoltaic applications

Selective harmonic elimination pulse width modulation based hybrid multilevel inverter topology with reduced components

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