An Improved Symmetric H-Bridge Multilevel Converter Topology; An Attempt to Reduce Power Losses

Alishah, Rasoul Shalchi; Hosseini, Seyed Hossein; Babaei, Ebrahim; Sabahi, Mehran; Ardashir, Jaber Fallah

doi:10.1142/s0218126618501876

Cited by 16 publications

(3 citation statements)

References 20 publications

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“…Also, the comparison studies the number of components per pole for each topology from the different topologies [10,31,[39][40][41][42][43][44][45]. This parameter has been studied in order to dedicate the most economical topology which uses the less number of components per pole.…”

Section: Figure3 Capacitors Charging Loopmentioning

confidence: 99%

A Multi-Cell 21-Level Hybrid Multilevel Inverter Synthesizes a Reduced Number of Components With Voltage Boosting Property

2020

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A multi-cell hybrid 21-Level multilevel inverter is proposed in this paper. The proposed topology includes two-unit; an H-bridge is cascaded with a modified K-type unit to generate an output voltage waveform with 21 levels based only on two unequal DC suppliers. The proposed topology's advantage lies in the fine and clear output voltage waveforms with high output efficiency. Meanwhile, the high number of output voltage waveform levels generates a low level of distortion and reduces the level of an electromagnetic interface (EMI). Moreover, it reduces the voltage stress on the switching devices and gives it a long lifetime. Also, the reduction in the number of components has a noticeable role in saving size and cost. Regarding the capacitors charging, the proposed topology presents an online method for charging and balancing the capacitor's voltage without any auxiliary circuits. The proposed topology can upgrade to a high number of output steps through the cascading connection. Undoubtedly this cascading will increase the power level to medium and high levels and reduce the harmonics content to a neglectable rate. The proposed system has been tested through the simulation results, and an experimental prototype based on the controller dSPACE (DS-1103) hardware unit used to support the simulation results.INDEX TERMS 21-Level Multilevel Inverter (MLI), hybridization, modified K-type inverter, online charging, self-balancing, voltage boosting inverter, Total Harmonic Distortion (THD).

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Section: Figure3 Capacitors Charging Loopmentioning

confidence: 99%

A Multi-Cell 21-Level Hybrid Multilevel Inverter Synthesizes a Reduced Number of Components With Voltage Boosting Property

2020

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“…The comparisons between Extension III and these topologies proposed in [28]- [34] have been given. As shown in Fig.…”

Section: Comparative Studymentioning

confidence: 99%

New Type Single-Supply Four-Switch Five-Level Inverter With Frequency Multiplication Capability

et al. 2020

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This paper focuses on the problems of a large number of components and complex structure for traditional five-level inverters. In order to solve the problem, a novel single-supply four-switch five-level inverter topology is proposed. Based on the H4 two-level full bridge inverter, one coupling inductor and two diodes are added to constitute the proposed topology. By means of the LPS-PWM modulation strategy with frequency doubling ability, one pair of complementary power switches operate at power frequency, and the other pair of high-frequency switches operate at the half of the output sine wave modulation frequency, which effectively reduces the switching loss and electromagnetic interference resulting from high switching frequency. In addition, three kinds of extended circuits of four-switch five-levels are proposed. A comprehensive comparison against the state-of-the-art topologies in terms of the required number of components is performed to attest the outperforming merits of the proposed topology. Finally, various experimental results are presented to validate the feasibility and operability of the proposed topology.

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“…Unfortunately, these topologies require a large number of power electronic–based components to provide a step staircase sinusoidal voltage with expedient steps. For the time being, different topologies have been introduced to create a high‐step staircase sinusoidal voltage 25‐27 . The power electronics experts have been endeavoring to suggest new topologies and renovate them to release conventional multilevel inverters' disadvantages 28‐30 .…”

Section: Introductionmentioning

confidence: 99%

Half‐cascaded multilevel inverter coupled to photovoltaic power source for AC‐voltage synthesizer of dynamic voltage restorer to enhance voltage quality

Falehi

2021

Int J Numerical Modelling

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Due to significant growth of the industrial companies and domestic electricity consumers along with appearance of the sensitive electrical and electronic equipment, the proper standard services have been more requested to provide high‐quality electrical energy. Dynamic voltage restorer (DVR) is a custom power electronic which is located in series with sensitive load and grid to mitigate the voltage sag and swell by injecting the relevant compensating voltage. High cost price of this compensator is related to its power supplies that it is replaced with renewable energy to make it cost‐effectiveness and eco‐friendly. Furthermore, the structure of multilevel inverter has a significant effect on providing high‐quality compensating voltage. In this paper, a novel HCMLI coupled to photovoltaic power source is proposed as AC‐voltage synthesizer for DVR to accurately compensate any voltage disturbances. Photovoltaic system can provide the required DC voltage with respect to voltage fluctuation range with low distortion. The step‐creation capability and cost‐effectiveness of the DVR based on proposed AC voltage synthesizer have been thoroughly evaluated. Feasibility of this multilevel inverter has correspondingly validated by the experimental results. Likewise, the performance of proposed DVR has been compared with conventional DVR and evaluated under different types of voltage disturbances. At last, the simulation results have confirmed the compensation capability of proposed DVR with proposed AC‐voltage synthesizer as compared with the conventional DVR to mitigate different sags and swells.

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An Improved Symmetric H-Bridge Multilevel Converter Topology; An Attempt to Reduce Power Losses

Cited by 16 publications

References 20 publications

A Multi-Cell 21-Level Hybrid Multilevel Inverter Synthesizes a Reduced Number of Components With Voltage Boosting Property

A Multi-Cell 21-Level Hybrid Multilevel Inverter Synthesizes a Reduced Number of Components With Voltage Boosting Property

New Type Single-Supply Four-Switch Five-Level Inverter With Frequency Multiplication Capability

Half‐cascaded multilevel inverter coupled to photovoltaic power source for AC‐voltage synthesizer of dynamic voltage restorer to enhance voltage quality

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