A Novel Dual Switching Frequency Modulation for Z-Source and Quasi-Z-Source Inverters

Mohammadi, Mohammad; Moghani, Javad Shokrollahi; Milimonfared, Jafar

doi:10.1109/tie.2017.2784346

Cited by 69 publications

(37 citation statements)

References 27 publications

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“…where E ON is the turn-on switching energy, E OFF is the turn-off switching energy in the MOSFET SiC and E swD is the energy of switching in the SiC Schottky diode [18]. The E on , E off , and E swD are calculated by (13)-(15): (15) where V DS is the voltage drain source, I D the continuous drain current, V dc is the voltage Dc link; the t ri , t fv , and Q rr are the current rise time, voltage fall time, and the reverse recovery charge, respectively [24].…”

Section: Power Losses and Efficiency In The V-i Power Convertermentioning

confidence: 99%

“…Nevertheless, this topology requires a very high performance capacitor in the direct current (DC) link that is expensive and bulky in the most cases [15]. As an alternative, the current source inverter (CSI) is a considered and emerging topology within electric traction systems, due to several advantages such as high voltage capability, auto short-circuit protection, and a better sinusoidal output voltage, because of alternating current AC capacitor effects [16][17][18]. In addition, the inductors used in CSI converters offer a longer lifetime than the capacitors used in VSI converters.…”

Section: Introductionmentioning

confidence: 99%

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A Simple Method for Reducing THD and Improving the Efficiency in CSI Topology Based on SiC Power Devices

et al. 2018

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Silicon carbide (SiC)-based switching devices provide significant performance improvements in many aspects, including lower power dissipation, higher operating temperatures, and faster switching; compared with conventional Si devices, all these features contribute to these devices generating interest in applications for electric traction systems. The topology that is frequently used in these systems is the voltage source inverter (VSI), but the use of SiC devices in the current source inverter topology (CSI), which is considered as an emerging topology, generates interest. This paper presents a method for improving total harmonic distortion (THD) in the currents of output and efficiency in SiC current source inverter for future application in an electric traction system. The method that is proposed consists of improving the coupling of a bidirectional converter topology, voltage current (V-I) and CSI. The V-I converter serves as a current regulator for the CSI, and allows for the recovery of energy. The method involves an effective selection of the switching frequencies and phase angles for the carrier signals that are present in each converter topology. With this method, it is expected to have a reduction of the total harmonic distortion, THD in the output currents. In addition, a comparative analysis between converters with all-SiC technology and converters with hybrid technology is realized, to verify the impact of the SiC devices in the power converters efficiency.

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Section: Power Losses and Efficiency In The V-i Power Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Simple Method for Reducing THD and Improving the Efficiency in CSI Topology Based on SiC Power Devices

et al. 2018

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“…So, to overcome these drawbacks, another solution can be envisaged by using a Z-source structure which consists of impedance networks (Inductances and capacitors) instead of the DC-DC converter. In this structure, the DC-AC converter can ensure at the same time the voltage boost and the induction motor control operation modes [9,10]. However, in the Z-source structure, the same high voltage is applied to the two capacitors while in Quasi Z-source, the voltage applied on one of the two capacitors is lower, which requires a lower capacitor rating.…”

Section: Introductionmentioning

confidence: 99%

Direct torque control of an induction motor fed by a Quasi Z-source inverter

2020

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This study presents an adapted direct torque control (DTC) of an induction motor fed by a Quasi Z-source power inverter. Indeed, the Quasi Z-source structure is introduced in the power inverter in order to boost the DC-Link voltage. For this, the boost control is mainly based on the shoot-through states of the power inverter which two power switches can be turned on at the same time. In this context, a switching table for DTC is developed to ensure an independent control of the flux and the torque of the induction motor and to boost the DC-Link voltage. Thus, the sampling time should be shared alternatively between the boost of the DC-Link voltage and the control of the electromagnetic torque. Consequently, the developed system reduces both the boost floor and the number of the used power switches. Moreover, it ensures a high-performance induction motor control. The validation results have been carried out to prove the effectiveness of the developed control.

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“…Authors in [24] introduced a carried-based modulation proposal for a 3L-T-type quasi-Z-source inverter with the ability of generating fixed-width ST states along the whole fundamental period and, in addition, balancing the neutral-point voltage. A modulation technique that combined high-and low-frequency carrier signals in a single-phase, quasi-Z-source, two-level inverter was used in [25]. References [26,27] deal with a two-level, quasi-Z-source inverter; the former applies a modulation technique to control the common-mode voltage, and the latter studies the design aspects to achieve a wide range of operation.…”

mentioning

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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A Novel Dual Switching Frequency Modulation for Z-Source and Quasi-Z-Source Inverters

Cited by 69 publications

References 27 publications

A Simple Method for Reducing THD and Improving the Efficiency in CSI Topology Based on SiC Power Devices

A Simple Method for Reducing THD and Improving the Efficiency in CSI Topology Based on SiC Power Devices

Direct torque control of an induction motor fed by a Quasi Z-source inverter

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

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