A Review on Multilevel Converter Topologies for Electric Transportation Applications

Qashqai, Pouria; Sheikholeslami, Abdolreza; Vahedi, Hani; Al‐Haddad, Kamal

doi:10.1109/vppc.2015.7352882

Cited by 61 publications

(27 citation statements)

References 46 publications

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“…The proposed method uses the cost function with only the neighboring vectors of an optimal vector at a present step, as in the MPC-conv2 method, in which the error terms are replaced with the voltages in Equation (16) instead of the currents in Equation (10). Thus, the proposed method results in a similar performance to that of the MPC-conv2 method in terms of harmonic spectrum performance of load currents and voltage waveforms during steady states.…”

Section: Proposed Predictive Control Methods For Single-phase Invertermentioning

confidence: 99%

“…Therefore, as the level increases, the calculation complexity of the MPC-conv1 method is increased. The cost function, h, defined using Equation (10), can be used to determine an optimal vector leading to the smallest error values between the reference and the predicted current values.…”

Section: Conventional Finite-control-set Model Predictive Control Metmentioning

confidence: 99%

“…Among them, the CHB types, which are based on a modular structure with isolated dc sources, do not require an increased number of clamping diodes and capacitors, each of which needs voltage balance control, as the voltage level is increased. In comparison with the other multilevel converters, because of the advantage of the CHB converters' modularity, they are relatively simple to construct with high level of voltages [10][11][12]. Regarding the control issues of the CHB converters, linear proportional and integral controllers combined with multicarrier-based pulse-width modulation (PWM) schemes, such as the level-shift and phase-shift methods, have been extensively studied [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Improved Finite-Control-Set Model Predictive Control for Cascaded H-Bridge Inverters

Roh

Kwak

2018

Energies

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Abstract:In multilevel cascaded H-bridge (CHB) inverters, the number of voltage vectors generated by the inverter quickly increases with increasing voltage level. However, because the sampling period is short, it is difficult to consider all the vectors as the voltage level increases. This paper proposes a model predictive control algorithm with reduced computational complexity and fast dynamic response for CHB inverters. The proposed method presents a robust approach to interpret a next step as a steady or transient state by comparing an optimal voltage vector at a present step and a reference voltage vector at the next step. During steady state, only an optimal vector at a present step and its adjacent vectors are considered as a candidate-vector subset. On the other hand, this paper defines a new candidate vector subset for the transient state, which consists of more vectors than those in the subset used for the steady state for fast dynamic speed; however, the vectors are less than all the possible vectors generated by the CHB inverter, for calculation simplicity. In conclusion, the proposed method can reduce the computational complexity without significantly deteriorating the dynamic responses.

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Section: Proposed Predictive Control Methods For Single-phase Invertermentioning

confidence: 99%

Section: Conventional Finite-control-set Model Predictive Control Metmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Finite-Control-Set Model Predictive Control for Cascaded H-Bridge Inverters

Roh

Kwak

2018

Energies

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“…On the other hand, active bridge rectifier could provide high power factor but the switching loss, filter size and current/voltage harmonic contents are still matters of concerns [13][14][15][16]. Considering proved advantages of multilevel converters such as low switching frequency, low harmonic distortion and high power conversion, they have been widely used in various industries [17][18][19]. Many multilevel rectifiers called bridgeless topologies are studied in the literature mainly including threelevel ones [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Five-level reduced-switch-count boost PFC rectifier with multicarrier PWM

Vahedi

Chandra

Al‐Haddad³

2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-A multilevel boost PFC (Power Factor Correction) rectifier is presented in this paper controlled by cascaded controller and multicarrier pulse width modulation technique. The presented topology has less active semiconductor switches compared to similar ones reducing the number of required gate drives that would shrink the manufactured box significantly. A simple controller has been implemented on the studied converter to generate a constant voltage at the output while generating a five-level voltage waveform at the input without connecting the load to the neutral point of the DC bus capacitors. Multicarrier PWM technique has been used to produce switching pulses from control signal at a fixed switching frequency. Multi-level voltage waveform harmonics has been analyzed comprehensively which affects the harmonic contents of input current and the size of required filters directly. Full experimental results confirm the good dynamic performance of the proposed five-level PFC boost rectifier in delivering power from AC grid to the DC loads while correcting the power factor at the AC side as well as reducing the current harmonics remarkably.

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“…Multilevel inverters constitute a class of devices which present interesting features that are naturally adapted to solar energy conversion schemes and therefore constitute an interesting solution to the proliferation of solar energy technology [6][7][8]. Multilevel inverters make use of switches and floating capacitors to produce various symmetrical voltage levels when controlled properly.…”

mentioning

confidence: 99%

Real-Time Implementation of Model-Predictive Control on Seven-Level Packed U-Cell Inverter

Metri

Vahedi

Kanaan

et al. 2016

IEEE Trans. Ind. Electron.

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121

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Abstract-In this paper a model predictive control (MPC) has been designed and implemented on the Packed U-Cell (PUC) inverter which has one isolated DC source and one capacitor as an auxiliary DC link. The MPC is designed to regulate the capacitor voltage at the desired magnitude to have seven voltage levels at the output of the inverter. Since grid-connected application is targeted by this application, the inverter should be capable of supplying requested amount of active and reactive power at the point of common coupling (PCC) as well. Therefore, MPC should also consider the line current control in order to monitor the exchange of reactive power with the grid while injecting appropriate active power at low THD. Various experimental tests including change in DC source voltage, active power variation and operation at different power factor (PF) have been performed on a laboratory prototype to validate the good performance obtained by the proposed MPC. The dynamic performance of the controller during sudden changes in dc capacitor voltage, supply current and PF demonstrates the fast and accurate response and the superior operation of the proposed controller.

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A Review on Multilevel Converter Topologies for Electric Transportation Applications

Cited by 61 publications

References 46 publications

Improved Finite-Control-Set Model Predictive Control for Cascaded H-Bridge Inverters

Improved Finite-Control-Set Model Predictive Control for Cascaded H-Bridge Inverters

Five-level reduced-switch-count boost PFC rectifier with multicarrier PWM

Real-Time Implementation of Model-Predictive Control on Seven-Level Packed U-Cell Inverter

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