Quasi Z-source NPC inverter for PV application

Effah, Francis Boafo; Wheeler, Patrick; Watson, Alan J.; Clare, Jon

doi:10.1109/powerafrica.2017.7991215

Cited by 8 publications

(11 citation statements)

References 19 publications

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“…In each study, the location of the impedance network and number of this network are different. Authors in reference [36] combine a three-level neutral point clamp structure and quasi-Z-source impedance network to provide a singlestage inverter that has both a continuous input current and reduced voltage across the switches. The combination of impedance network structures and multi-level inverters has also been studied in references [37][38][39][40].…”

Section: Z-source Familymentioning

confidence: 99%

Single-Stage Buck–Boost Inverters: A State-of-the-Art Survey

2022

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Single-stage buck–boost inverters have attracted the attention of many researchers, due to their ability to increase/decrease the output voltage in one power conversion stage. One of the most important uses of these inverters is in photovoltaic applications, where the voltage of the solar panels varies in a wide range. In recent years, many new inverters have been proposed to improve the performance of existing structures. In this paper, the state of the art of these single-stage buck–boost inverters is discussed. The advantages and disadvantages of each structure are examined from different perspectives, such as the number of components, losses, and performance. Finally, in a general comparison, the properties of all structures are discussed and summarized in a table.

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Section: Z-source Familymentioning

confidence: 99%

Single-Stage Buck–Boost Inverters: A State-of-the-Art Survey

2022

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“…The main contributions of this paper are: • Proposal of a carrier-based pulse width modulation able to generate alternating UST and LST states for a multilevel Z-source, which provides several benefits (aforementioned) compared to the conventional FST state strategies presented in [5,11,24]. • Development of the strategy as a carrier-based pulse width instead of SVM-based, as others reported in the literature [22,23,30], allowing easier implementation. • Application of the proposed strategy in a three-phase, 3L-T-type qZS inverter.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Continuous conduction mode was assumed for the converter operation as well. Then, as the average voltage across inductors during one switching period should be zero in steady state, the boost factor (defined as B =V PN /V in , whereV PN is the peak DC-link voltage, present during NST states) can be calculated by the following Equation, [30]:…”

Section: The Voltages Across the Inductors And Capacitors Arementioning

confidence: 99%

“…Therefore, besides the full shoot-through (FST) state previously mentioned, two new switching states emerge for three-level inverters: upper shoot-through (UST) and lower shoot-through (LST). These states were defined in [29]; the idea was applied to a 3L-NPC Z-source inverter [19], to a 3L-NPC-quasi-Z-source inverter [30], and to a 3L-T-type Z-source inverter [20]. Moreover, literature pieces dealing with the concept of UST/LST states have all used the modulation-based SVM technique.…”

Section: Introductionmentioning

confidence: 99%

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Improvements on the Carrier-Based Control Method for a Three-Level T-Type, Quasi-Impedance-Source Inverter

et al. 2019

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The boost feature that characterizes Z-source and quasi-Z-source converters is usually achieved by means of a proper insertion of short-circuit states in the full DC-link. In this work, a novel pulse width modulation carrier-based strategy for a three-phase, three-level T-type, quasi-Z-source inverter is introduced, based on the addition of alternate short-circuits in the two halves of the DC-link bus. This technique achieves better performance, less electromagnetic interference, and lower harmonic distortion of the output line-to-line voltage compared to the traditional methods based on the full DC-link shoot-through. At the same time, generating the switching states is to easy implement. The proposed strategy permits the use of electronic devices with lower blocking voltage capability, thus improving converter reliability, size, and cost. The new method may be implemented in another multilevel inverter with an impedance-source network as well. A comprehensive simulation study is performed in order to validate the adopted method, with different inverter input voltages, which is taken as representative of a photovoltaic array. Comparisons are conducted with conventional strategy insertions using the same topology in order to show the improvements achieved.

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“…To eliminate these two DC-link capacitors, a new topology, including two quasi-Z-source networks with Space Vector Modulation (SVM) technique, is proposed in [28]. The drawbacks of utilizing two independent INs, such as the excessive number of passive elements and requiring two isolated DC sources, pose a limitation to its application.…”

Section: Introductionmentioning

confidence: 99%

A Three-Level Single Stage A-Source Inverter With the Ability to Generate Active Voltage Vector During Shoot-Through State

et al. 2022

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Single-stage boosting capability of impedance network (IN) inverters makes this family of inverters an attractive choice for DC/AC applications with low input DC voltage. A specific time of shootthrough (ST) state is required to achieve the required voltage gain. Conventionally ST state and zero output voltage vector should be applied simultaneously. This constraint limits the modulation index and increases the voltage stress of the semiconductor devices, particularly for applications requiring a high boosting factor. In this paper, as the boosting stage for a three-level inverter, a new modified configuration of A-source IN with two series outputs is proposed and connected to a 10-switches three-level inverter. Besides generating two outputs by a single IN, the proposed DC/AC inverter is able to apply an active voltage vector during the ST state. This capability improves the DC/AC voltage gain, increases the modulation index, and decreases the required ST time. The operation principles are described, and the steady-state relations are derived. It is compared with other magnetically coupled INs in terms of boost factor and voltage stress of switches. Considering the 10-switches three-level inverter as the front-end inverter, an adopted maximum boost strategy using the space vector modulation is developed targeting minimum ST time. Finally, a laboratory prototype of the converter is developed, and several tests are carried out. The results validate the given theories and simulations.

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Quasi Z-source NPC inverter for PV application

Cited by 8 publications

References 19 publications

Single-Stage Buck–Boost Inverters: A State-of-the-Art Survey

Single-Stage Buck–Boost Inverters: A State-of-the-Art Survey

Improvements on the Carrier-Based Control Method for a Three-Level T-Type, Quasi-Impedance-Source Inverter

A Three-Level Single Stage A-Source Inverter With the Ability to Generate Active Voltage Vector During Shoot-Through State

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