Quasi-Z-Source Inverter With a T-Type Converter in Normal and Failure Mode

Pires, V. Fernão; Cordeiro, Armando; Foito, Daniel; Martins, João

doi:10.1109/tpel.2016.2514979

Cited by 103 publications

(16 citation statements)

References 39 publications

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“…In this topology, the input current is continuous and voltage stress on capacitors is reduced, significantly. To inherit the outstanding advantages of MIs, a combination of the qZS network with 3L-T 2 I was discussed in [2,[19][20][21][22][23][24][25]. These studies connected two identical qZS networks in cascade form to produce a three-level voltage at the output terminal.…”

Section: Introductionmentioning

confidence: 99%

A Three-Level DC-Link Quasi-Switch Boost T-Type Inverter with Voltage Stress Reduction

Tran

et al. 2020

Energies

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In recent years, the three-level T-Type inverter has been considered the best choice for many low and medium power applications. Nevertheless, this topology is known as a buck converter. Therefore, in this paper, a new topology incorporating the dc-link type quasi-switched boost network with the traditional three-level T-type inverter is proposed to overcome the limit of traditional three-level T-Type inverter. The space vector pulse width modulation scheme is considered to control this topology, which provides some benefits such as enhancing modulation index and reducing the magnitude of common-mode voltage. For this scheme, the zero, medium, and large vectors are utilized to generate the output voltage. The shoot-through state which is adopted by turning on all power switches of inverter leg is inserted into zero vector to boost the dc-link voltage. As a result, there is no distortion at the output waveform. The control signal of intermediate network power switches is also detailed to improve the boost factor and voltage gain. As a result, the voltage stress on power devices like capacitors, diodes, and switches is decreased significantly. To demonstrate the outstanding of proposed structure and its control strategy, some comparisons between the proposed method and other ones are performed. Simulation and experimental prototype results are conducted to verify the accuracy of the theory and effectiveness of the inverter.

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Section: Introductionmentioning

confidence: 99%

A Three-Level DC-Link Quasi-Switch Boost T-Type Inverter with Voltage Stress Reduction

Tran

et al. 2020

Energies

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“…This phenomenon can destroy switching devices used in the inverter, as well as cause a short circuit at input power supply [13]. This issue can be addressed by incorporating deadtime with a control signal fed to the inverter switching devices [13,14]. However, the effectiveness of the converter is not guaranteed, since it causes the distortion of an output waveform [11][12][13][14][15].The Z-source (ZS) inverter topology, known as a single-stage power converter with a buck-boost capability and ST immune, is proposed in [16] to overcome the limitation of traditional MLIs.…”

mentioning

confidence: 99%

“…This issue can be addressed by incorporating deadtime with a control signal fed to the inverter switching devices [13,14]. However, the effectiveness of the converter is not guaranteed, since it causes the distortion of an output waveform [11][12][13][14][15].The Z-source (ZS) inverter topology, known as a single-stage power converter with a buck-boost capability and ST immune, is proposed in [16] to overcome the limitation of traditional MLIs. By adding the intermediate impedance network between the input power supply and inverter leg, the DC-link of the inverter is boost to the desired value instead of using an additional DC-DC converter before the inverter leg.…”

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confidence: 99%

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Common Mode Voltage Elimination for Quasi-Switch Boost T-Type Inverter Based on SVM Technique

Nguyen

Ngo

et al. 2020

Electronics

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In this paper, the effect of common-mode voltage generated in the three-level quasi-switched boost T-type inverter is minimized by applying the proposed space-vector modulation technique, which uses only medium vectors and zero vector to synthesize the reference vector. The switching sequence is selected smoothly for inserting the shoot-through state for the inverter branch. The shoot-through vector is added within the zero vector in order to not affect the active vectors as well as the output voltage. In addition, the shoot-through control signal of active switches of the impedance network is generated to ensure that its phase is shifted 90 degrees compared to shoot through the signal of the inverter leg, which provides an improvement in reducing the inductor current ripple and enhancing the voltage gain. The effectiveness of the proposed method is verified through simulation and experimental results. In addition, the superiority of the proposed scheme is demonstrated by comparing it to the conventional pulse-width modulation technique.

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“…This paper proved that a higher efficiency and a better distribution of switching losses among the switches was achievable. Reference [14] presented the association of two symmetrical quasi-Z-source networks with a T-type inverter that could operate both under regular and semiconductor fault situations. A comparison of three-phase, three-level VSIs with intermediate DC/DC boost converters and three-level quasi-Z-source inverters was reported in [15].…”

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confidence: 99%

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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Quasi-Z-Source Inverter With a T-Type Converter in Normal and Failure Mode

Cited by 103 publications

References 39 publications

A Three-Level DC-Link Quasi-Switch Boost T-Type Inverter with Voltage Stress Reduction

A Three-Level DC-Link Quasi-Switch Boost T-Type Inverter with Voltage Stress Reduction

Common Mode Voltage Elimination for Quasi-Switch Boost T-Type Inverter Based on SVM Technique

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

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