Modulation technique for Four‐Leg Voltage Source Inverter without a Look‐Up Table

Ebrahimzadeh, Esmaeil; Farhangi, Shahrokh; Iman‐Eini, Hossein; Blaabjerg, Frede

doi:10.1049/iet-pel.2015.0310

Cited by 20 publications

(9 citation statements)

References 19 publications

(34 reference statements)

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“…The objective of a (P+GI) controller is to achieve a phase and zero magnitude error in ac systems [22]. This compensator is obtained based on the PI controller previously designed in dc and applying the dc-ac coordinate transformation shown in expression (30).…”

Section: Coordinate Transformationmentioning

confidence: 99%

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Three Phase Four-Wire Inverter for Grid-Disconnected Operation

Vásquez

Ortega

et al. 2020

IEEE Access

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In this work, the modeling of a three-phase four wires inverter and the design of two control schemes for its grid-disconnected operation are presented. The advantages of the four-wire topology are that by means of a coordinate transformation (Park transformation) it is possible to obtain a decoupled linear model, as well as feeding single-phase and three-phase loads in this operating mode. In the model, two control loops are taken into account: a current loop (controller slave) and a voltage loop (controller master) with the aim that this inverter can regulate its output voltage and when it is supplied to a local load.. The contributions of this work is present in the inverter modeling, the method for obtaining the transfer functions and in the controllers design obtained by this method. The inverter model allows to easily obtain the transfer functions of both loops; this is very important for the control area, considering that using classical control techniques and the methodology proposed in this work, the gains can be obtained directly and not adjusted to trial and error. The main advantage of this proposal is that when the kp and ki gains are obtained through the Bode diagrams, we can obtain generalized integrators; applying the coordinate transformation method to the integral gain that was obtained by the design of the PI controller in direct current (dc); This method is described in detail in the presented work and allows obtaining a new controller called proportional controller plus generalized integrator (P+GI). This controller presents a good performance, since it can follow sinusoidal references, in addition to presenting a better disturbances rejection due to the high gains it presents at the grid frequency and harmonic frequencies of the load.

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Section: Coordinate Transformationmentioning

confidence: 99%

“…As mentioned above, control techniques that achieve high performance of the four-legged inverter under different conditions linear/non-linear load and balanced/unbalanced are required. Several models and methods of scheme controllers of the four-legged inverter are reported in the literature [30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Three Phase Four-Wire Inverter for Grid-Disconnected Operation

Vásquez

Ortega

et al. 2020

IEEE Access

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“…The qZSI cells exhibit two distinct categories of operating modes: non-shoot-through operating modes and shoot-through operating modes. When a qZSI cell is in a non-shoot-through mode, it operates similar to a conventional H-bridge cell while also boosting the input voltage to its H-bridge stage according to (3). While a qZSI cell is in a shoot-through mode, the input terminal to the H-bridge stage is short circuited, rendering the value of V dc to 0 [6].…”

Section: Impedance-source Network and Minimising Voltage Stress On Swmentioning

confidence: 99%

Fault‐tolerant multilevel cascaded H‐bridge inverter using impedance‐sourced network

Aleenejad

Ahmadi

2016

IET Power Electronics

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This study proposes a fault-tolerant scheme for an impedance-sourced cascaded H-bridge (CHB) converter that can fully restore the converter operation to the pre-fault conditions without any hardware intervention. The proposed faulttolerant scheme has three key elements: a new quasi-z-source CHB converter, a modified modulation method for the introduced z-source CHB, and a modified implementation of the fundamental phase shift compensation (FPSC) method. In case of a fault on one of the inverter switches, the proposed fault-tolerant scheme enables the z-source CHB to generate balanced line-to-line voltages with the same amplitude as the pre-fault voltages, while evenly distributing an inevitable voltage stress increase over all converter switches. In this study, first a brief review of CHB converters and the FPSC method is provided. Then the proposed fault-tolerant scheme is introduced. Finally, several experimental results from a prototype converter are provided to validate the operation of the proposed strategy.

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“…There are many kinds of topologies to meet the above requirements, such as the split capacitor inverter (SCI) [1,2], four-leg inverter [3][4][5][6][7][8][9], and neutral point forming transformer (NFT) inverter [10,11]. The split capacitors of SCI not only act as support capacitors, but also provide the route of the unbalanced current and ripple current, which means that split capacitors have a larger volume and weight, and the ripple current in support capacitors and filter capacitors is larger than in other structures, which makes the capacitors be vulnerable to the ripple current.…”

Section: Introductionmentioning

confidence: 99%

Control Strategy of Three-Phase Inverter with Isolation Transformer

Chen

Qiu

et al. 2019

Energies

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In order to improve the control performance of a train auxiliary inverter and satisfy the requirements of power quality, harmonics, and unbalanced factor, this paper proposed a design method of a double closed-loop control system based on a complex state variable structure. The method simplifies the design process and takes full account of the effects of coupling and discretization. In the current closed-loop process, this paper analyzed the limitations of the proportional integral (PI) controller and simplified to P controller. In the voltage closed-loop, the paper employed the PI controller plus the resonant controller, designed the parameters of the PI controller. and analyzed the optimal discretization method of the resonant controller under dq axis coupling. Finally, experiments and simulations were conducted to show that the proposed method can achieve the above improvements.

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Modulation technique for Four‐Leg Voltage Source Inverter without a Look‐Up Table

Cited by 20 publications

References 19 publications

Three Phase Four-Wire Inverter for Grid-Disconnected Operation

Three Phase Four-Wire Inverter for Grid-Disconnected Operation

Fault‐tolerant multilevel cascaded H‐bridge inverter using impedance‐sourced network

Control Strategy of Three-Phase Inverter with Isolation Transformer

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