Cascaded Transformer Multilevel Inverters With Asymmetrical Turns Ratios Based on NPC

Bahia, Filipe A. da C.; Jacobina, Cursino B.; Rocha, Nady; Sousa, Reuben P. R.

doi:10.1109/tie.2019.2938399

Cited by 12 publications

(13 citation statements)

References 19 publications

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“…Literature shows three important former MLIs are usually categorized: (1) The flying capacitor (FC); (2) the neutral point clamped (NPC); (3) the cascaded H bridge (CHB). [8][9][10] Aforementioned structure offers both benefits and drawbacks. As the number of load voltage levels increases, the component count also rises, and therefore the cost of MLI is high.…”

Section: Literature Reviewmentioning

confidence: 99%

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A new single‐phase multilevel inverter with improved modulation technique

Rao

Suresh

Naik

et al. 2023

Circuit Theory & Apps

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SummaryThis article proposes a seventeen‐level (17L) inverter with a common leg configuration and an improved modulation technique. The proposed inverter uses only 10 switches, one toroidal core transformer, and one dc source. Therefore, the proposed design offers less control complexity with reduced cost and volume. Additionally, the suggested modulation technique improves the load voltage quality by minimizing the harmonic content. Simulation and laboratory studies are performed to confirm the proficiency of the suggested inverter with a new modulation technique. Further, a thorough comparison with recent transformer‐based circuits is carried out to highlight the benefits of the proposed structure.

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Section: Literature Reviewmentioning

confidence: 99%

“…Recent past several structures for TMLI have been presented. [19][20][21][22][23][24][25] The key benefits of these TMLIs are to minimize the number of transformers, sources, and switches. Later topology in Gandomi et al 12 is suggested in high voltage and renewable energy applications.…”

Section: Literature Reviewmentioning

confidence: 99%

A new single‐phase multilevel inverter with improved modulation technique

Rao

Suresh

Naik

et al. 2023

Circuit Theory & Apps

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“…The control architecture shown in Fig.2 has two external control loops to process the error between the reference and the measured dc voltages. Afterwards, the total and the difference active powers are multiplied by variables K T and K inferred from equations (11) and 12 (14) represent the dq components of v s and v c respectively. Then, a decoupling stage based on (4) is used to obtain the average modulated voltages v u and v l .…”

Section: B Central Control Descriptionmentioning

confidence: 99%

“…They consist of several H-bridge modules connected in parallel to the same dc source, while the ac side is connected to low-frequency transformers. One of their main advantages is the possibility of setting a certain transformer ratio to reach symmetrical and asymmetrical voltage levels [14]- [16]. However, the limitation of using a single dc source in the case of large power applications has encouraged researchers to find other configurations such as the Isolated Multi-Modular Converter (IMMC) proposed in [17].…”

Section: Introductionmentioning

confidence: 99%

Energy Balancing With Wide Range of Operation in the Isolated Multi-Modular Converter

2020

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The series-connection of modules in multilevel converters are prone to energy imbalances in the dc capacitor due to the differences between the power absorbed and consumed. In renewable energy applications where the primary source is directly connected to each module, energy imbalances can be even worse if the primary sources are affected by unpredictable weather conditions. Therefore, control strategies are required to compensate such energy imbalances, while maintaining the correct converter operation. Focusing our attention on a cascaded transformer multilevel inverter called Isolated Multi-Modular Converter, this paper introduces the combination of two control strategies aimed at providing a wide range of operation under imbalanced energy states. A general analytical model, including the regulation capability and differences with an existing strategy are presented to demonstrate the performance of the control proposed. The effectiveness of the proposal is validated through experimental results based on a three-phase multilevel prototype. INDEX TERMS Cascaded transformer multilevel inverter, dc energy balancing, isolated multi-modular converter, multilevel converters.

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“…As the number of PV arrays increases, there occurs an increase in maximum power point controllers. The single source topologies address this problem by providing AC side isolation [2,3]. The highfrequency magnetic linkage-based multilevel converter for largescale power transfer is reported in [4].…”

Section: Introductionmentioning

confidence: 99%

Optimal third harmonic injection based nearest level control of large‐scale solar photovoltaic multilevel converter

Yadav

Mishra

Singh

2022

Energy Conversion and Econom

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This paper presents a new control approach with an optimal third harmonic injectionbased nearest level modulation (OTHI-NLM) technique for a large-scale solar photovoltaic (SPV) system. This system uses a single-source multilevel converter to feed solar power into the grid. The merits of the optimal third harmonic injection (OTHI) and nearest level modulation (NLM) are considered for switching the SPV converter. A unique analysis to have an adaptive optimal injection with varying solar irradiance is conducted and compared with the well-known carrier-based high-frequency switching technique. The variations of harmonics for OTHI-NLM, an optimal third harmonic pulse width modulation (OTHI-PWM), and a constant third harmonic injection method are analysed at different irradiance levels. This optimal injection provides benefits such as enhanced DC bus utilization (DBU), better harmonics performance at different solar irradiance levels. The detailed methodology of the OTHI algorithm, nearest level modulation (NLM) technique with an optimal quotient calculation, and an instantaneous optimal third harmonic injection (THI) in closed-loop are presented. The comparative analysis shows the effectiveness of the SPV grid-tied structure over well-known ones. The power quality of the renewable energy system is investigated in dynamic solar irradiations. Moreover, simulation results are presented and validated in a real-time test bench.

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Cascaded Transformer Multilevel Inverters With Asymmetrical Turns Ratios Based on NPC

Cited by 12 publications

References 19 publications

A new single‐phase multilevel inverter with improved modulation technique

A new single‐phase multilevel inverter with improved modulation technique

Energy Balancing With Wide Range of Operation in the Isolated Multi-Modular Converter

Optimal third harmonic injection based nearest level control of large‐scale solar photovoltaic multilevel converter

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