A Novel Asymmetric Multilevel Inverter with Phase Disposed Switching Technique for Grid Integration of Solar Photovoltaic Systems

Islam, Tariqul; Islam, Md. Rabiul; Rahman, Fayzur; Kiran, Mahbubur Rahman; Hasan, Aktham

doi:10.1109/tensymp50017.2020.9230966

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…Figure 1(a) illustrates the proposed symmetrical five-level inverter [28]. It employs a total of six switching devices, two diodes, and two voltage sources of identical values to provide five separate levels of output voltage.…”

Section: Proposed Multilevel Invertermentioning

confidence: 99%

Harmonics Minimization of Symmetric Five-Level Inverter Using Improved LSF Modulation Scheme

Islam,

Alam,

Lipu

et al. 2024

IEEE Access

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The use of multilevel inverters has gained popularity due to their ability to generate highquality output voltage with reduced harmonic distortion. The performance of these multilevel inverters can be improved by using a low switching frequency modulation scheme as it enables precise amplitude and harmonic control in the output voltage. Determination of optimum switching angles for minimum total harmonic distortion (THD) generally requires complex algorithms with large number of iterations. This work presents a novel approach for calculating optimum switching angles at low frequencies that produces low THD in the output voltage. The calculation process uses only one controlling parameter that allows easy computation of optimum switching angles with a lesser number of iterations. The effectiveness of the calculated switching angles in producing lower THD is verified through simulation in Matlab/Simulink platform as well as experimentally by developing a small-scale lab prototype of symmetric five-level inverter systems. For generalization, the proposed switching angle calculation technique is examined through different levels of inverter for minimum THDs. The superiority of the proposed switching technique is verified through an extensive comparison with other popular low-frequency strategies which revealed that the proposed technique produces lower THD and higher fundamental voltage than those of the Equal Phase (EP), Feed Forward (FF), and Half Height (HH) methods. This feature of producing higher-quality fundamental voltage would make it a preferred choice for high power multi-level inverters.INDEX TERMS Multilevel inverter, optimum switching angle calculation, total harmonic distortion, fundamental voltage, low frequency switching.

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Section: Proposed Multilevel Invertermentioning

confidence: 99%

Harmonics Minimization of Symmetric Five-Level Inverter Using Improved LSF Modulation Scheme

Islam,

Alam,

Lipu

et al. 2024

IEEE Access

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“…Therefore, this topology has been adopted for the purpose. Although some recent topologies claim higher number of output voltage levels with fewer components, they use some techniques such as asymmetric technique that needs different DC supply [11], [12]. This technique is not suitable for photovoltaic (PV) In a large scale PV plant, installation procedure shall be straight forward and simple to enable technicians at site avoid mistakes and faults during installation.…”

Section: Introductionmentioning

confidence: 99%

Z-source reversing voltage multilevel inverter for photovoltaic applications with inherent voltage balancing

Najafi

Rashidi

Dehghan

2022

IJPEDS

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Photovoltaic (PV) inverters have been widely used in solar energy to change the direct current (DC) voltage of PV panels to the grid alternating current (AC) voltage. They are comprised of DC-DC section for maximum power point tracking (MPPT) and DC-AC part to provide required output AC voltage. This paper provides a unique configuration that integrates both sections in one part. A Z-source multilevel inverter is proposed based on Z-source networks and reversing voltage (RV) multilevel inverter. The Z-source network can be used to increase the level of the input voltages and MPPT as well. In addition, the prop used topology uses multilevel topology to accommodate more DC inputs and benefit from features of multilevel level inverters in AC output. Moreover, using Z-source network can minimize equated monthly installment (EMI) due to the lower stress on the semiconductor switches. Finally, a seven level topology is designed and simulated to show the performance of proposed topology.

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“…As these topologies operating with power frequency, the size and weight of the system is high compared to proposed topology [15]. The topology used in [28] uses less switching devices and operating frequency of transformers is high but this topology needs higher number of transformers and diodes to generate high quality output voltage. Further, it uses separate DC source/link capacitor for each transformer.…”

mentioning

confidence: 99%

Integration Battery Energy Storage Using T- Type Solid State Transformer Based Multilevel Inverter

Molli¹,

P²

2023

Preprint

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Storage technologies are essential for preserving the renewable grid power balance between generation and consumption. In this research, a solid-state transformer (SST) based T-type multilevel inverter (MLI) is proposed for the medium/high voltage integration of large-scale battery energy storage (BES). For any turn ratio, the proposed SST-MLI generates 25 levels with fewer switching devices and SSTs. A novel dynamic phase shift controller (NDPSC) is also being developed for the proposed BES system. The NDPSC controller regulates active and reactive power by maintaining the battery's health. The NDPSC controller uses two gain control factors tuned to produce a fast response without overshooting. The proposed battery storage system's dynamic behavior is simulated in MATLAB/Simulink for various active and reactive power variations and experimentally validated in a low-power laboratory prototype system.

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A Novel Asymmetric Multilevel Inverter with Phase Disposed Switching Technique for Grid Integration of Solar Photovoltaic Systems

Cited by 9 publications

References 9 publications

Harmonics Minimization of Symmetric Five-Level Inverter Using Improved LSF Modulation Scheme

Harmonics Minimization of Symmetric Five-Level Inverter Using Improved LSF Modulation Scheme

Z-source reversing voltage multilevel inverter for photovoltaic applications with inherent voltage balancing

Integration Battery Energy Storage Using T- Type Solid State Transformer Based Multilevel Inverter

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