A new high‐level boost inverter topology with reduced device count

Siddique, Marif Daula; Reddy, B. Prathap; Meraj, Mohammad; Iqbal, Atif

doi:10.1002/cta.3280

Cited by 11 publications

(11 citation statements)

References 27 publications

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“…To test the proposed topology operating at a low switching frequency, the nearest level control (NLC) modulation technique with dSPACE 1104 controller was used to generate gate signals for the power switches. The NLC method, also called the round modulation method or the half-integer method, can be easily performed by round function (Sathik et al, 2021;Mustafa et al, 2022;Siddique et al, 2022). This technique can produce the closest voltage level by comparing the inverter output voltage with the reference sinusoidal voltage to produce proper switching signals.…”

Section: Resultsmentioning

confidence: 99%

An improved seven-level switched-capacitor-based neutral-point clamped inverter

et al. 2022

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Multilevel inverters (MLIs) have seen significant growth in a variety of medium- to high-power industrial applications and have become a mature and viable solution for renewable energy systems over the past decade. The major concerns of MLIs are the high component count and the buck-type feature of the ac output voltage when used for grid-connected renewable-energy-based sources such as solar photovoltaic (PV) panels. As another option, a switched-capacitor (SC)-based inverter possessing the feature of boost ability is a prime solution to meet the requirements of ac power applications. Integrating an SC network with a neutral-point clamped (NPC) structure makes leakage current alleviation viable for transformerless PV grid-connected systems. In this article, an improved SCMLI based on the NPC structure is proposed to reduce the number of active switches and the number of switches in the charging loop, significantly reducing the power loss. It can generate seven voltage levels with voltage boosting and self-balancing of capacitors within a single-stage power conversion. The working principle of the proposed topology, circuit description, and control technique are presented. Further, the proposed inverter was compared with other recent SC topologies to show its superiority. In the end, a laboratory prototype was developed and tested for the seven-level module under steady-state and dynamic conditions to validate the practical viability of the proposed configuration. The proposed inverter’s maximum efficiency was 97.5% at 1.2 kW rated power.

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Section: Resultsmentioning

confidence: 99%

An improved seven-level switched-capacitor-based neutral-point clamped inverter

et al. 2022

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“…When (S 3 = S 4 = 0) or (S 3 = 1 and S 4 = 0) in phase B, shown in Figure 3(5) (7), the point N 0 is at a negative potential with respect to the neutral point N; meanwhile (S 1 = S 2 = 0) or (S 1 = 1 and S 2 = 0) in phase A, shown in Figure 3 (1) (3), the current from the phase A will first pass the load and then go throw the inverse diodes, which parallel with S 1 and S 2 of phase B also leads to the phase to phase circulation. Inserting an inductor L i1 in the AC side in Figure 6B keeps the point N 0 at a positive potential with respect to the neutral point N, which makes the current flow to the negative point among one phase.…”

Section: The Restraining Of the Phase-to-phase Current Circulationmentioning

confidence: 99%

“…1,2 The most typical multilevel converters are neutral point clamped (NPC), 3,4 cascaded H-bridge (CHB), 5 and flying capacitor (FC). 6 In order to achieve the high voltage power transformation 7 by using low voltage power electronic devices and mitigate input current harmonics, the bulky line-frequency (LF) phase-shifted transformers have always been used for isolation in such multilevel converters.…”

Section: Introductionmentioning

confidence: 99%

A novel bridgeless flying capacitor multilevel rectifier

Cheng

Wang

et al. 2023

Circuit Theory & Apps

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SummaryA novel transformerless three‐phase unidirectional bridgeless flying capacitor (UBFC) rectifier for medium‐voltage and high‐voltage applications is presented in this paper. The rectifier consists of three single‐phase rectifiers in wye connection; the DC outputs of the three single‐phase rectifiers are connected in parallel to provide a high common DC‐link bus, which makes it convenient to connect with neutral point clamped (NPC) or flying capacitor (FC) multilevel inverters. To avoid phase‐to‐phase current circulation, an additional inductor and diode are added to each single‐phase rectifier. Compared with conventional bidirectional multilevel converters, only half IGBTs are used, the voltage stress is lower, and the line‐frequency transformers are no longer required, which makes the proposed rectifier has a series of advantages such as reduced cost, simplified control complexity, increased reliability and improved overall efficiency. The basic operating principle of the proposed rectifier in continuous conduction mode is discussed; an improved carrier‐based level‐shifted pulse‐width modulation (PWM) method integrated with voltage balancing and the double closed‐loop control strategy are proposed to achieve more voltage levels and keep the flying capacitors in balance. The feasibility of the proposed rectifier is verified by the simulation and experimental results.

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“…This results in the complete elimination of LC. A high‐gain boost inverter is reported in Siddique et al 8 But the voltage stress grows significantly. The CG‐based structure is discussed in Sarikhani et al 9 and Jiang et al, 10 which does not feature proper power decoupling.…”

Section: Introductionmentioning

confidence: 99%

Single‐phase five‐level common‐ground transformerless inverter using switched capacitors for photovoltaic application

Neti

Singh

Pattnaik

et al. 2023

Circuit Theory & Apps

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Transformerless inverters (TLIs) are extensively used in the photovoltaic (PV) grid‐connected system. TLI with a common ground structure exhibits multiple excellent features that improve the efficiency of the inverter, eliminating leakage current and boosting the voltage. The use of TLI eliminates the electrical isolation required between PV and the grid, resulting in a leakage current (LC) issue. The LC affects the power quality of the inverter and creates a safety‐related issue. This paper presents a new TLI topology based on the common ground (CG) structure. This topology uses eight switches and two self‐balanced switched capacitors. Phase disposition pulse width modulation (PD‐PWM) control scheme is used to create a five‐level output voltage. Further, adequate analysis for component selection and loss analysis is carried out to evaluate the efficiency. Its CG configuration certifies that there is minimal LC and common mode voltage (CMV). It also supports the active and reactive power of the grid. Its dual gain makes it suitable for photovoltaic (PV) applications. This topology is simulated for leading, lagging, unity power factor (UPF), and changes in input voltage and load conditions. Later, a corresponding experimental test is carried out on a laboratory prototype (1 kW). An equitable comparison is carried out for the component, stresses, and features like CG, and LC, along with efficiency.

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A new high‐level boost inverter topology with reduced device count

Cited by 11 publications

References 27 publications

An improved seven-level switched-capacitor-based neutral-point clamped inverter

An improved seven-level switched-capacitor-based neutral-point clamped inverter

A novel bridgeless flying capacitor multilevel rectifier

Single‐phase five‐level common‐ground transformerless inverter using switched capacitors for photovoltaic application

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