A DC Link Sensor-Less Voltage Balancing Technique for Cascaded H-Bridge Multilevel Converters With Asymmetric Selective Harmonic Current Mitigation-PWM

Moeini, Amirhossein; Wang, Shuo

doi:10.1109/tpel.2017.2770141

Cited by 25 publications

(9 citation statements)

References 21 publications

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“…However, in [28] only one capacitor module is considered and a predetermined switching scheme, as in [12], requires a large memory for the lookup table. In [31][32][33] it is shown that a predetermined switching pattern can be even used to operate the inverter without measuring the capacitor voltages. Nonetheless, in [31][32][33] only a symmetric MLC is considered.…”

Section: Introductionmentioning

confidence: 99%

“…In [31][32][33] it is shown that a predetermined switching pattern can be even used to operate the inverter without measuring the capacitor voltages. Nonetheless, in [31][32][33] only a symmetric MLC is considered. In contrast, the authors of [29] suggest a self-balancing modulation scheme for binary asymmetric MLCs without measuring (sensorless) the floating capacitors' voltages.…”

Section: Introductionmentioning

confidence: 99%

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Capacitor Voltage Balancing of a Grid-Tied, Cascaded Multilevel Converter with Binary Asymmetric Voltage Levels Using an Optimal One-Step-Ahead Switching-State Combination Approach

et al. 2022

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This paper presents a novel capacitor voltage balancing control approach for cascaded multilevel inverters with an arbitrary number of series-connected H-Bridge modules (floating capacitor modules) with asymmetric voltages, tiered by a factor of two (binary asymmetric). Using a nearest-level reference waveform, the balancing approach uses a one-step-ahead approach to find the optimal switching-state combination among all redundant switching-state combinations to balance the capacitor voltages as quickly as possible. Moreover, using a Lyapunov function candidate and considering LaSalle’s invariance principle, it is shown that an offline calculated trajectory of optimal switching-state combinations for each discrete output voltage level can be used to operate (asymptotically stable) the inverter without measuring any of the capacitor voltages, achieving a novel sensorless control as well. To verify the stability of the one-step-ahead balancing approach and its sensorless variant, a demonstrator inverter with 33 levels is operated in grid-tied mode. For the chosen 33-level converter, the NPC main-stage and the individual H-bridge modules are operated with an individual switching frequency of about 1 kHz and 2 kHz, respectively. The sensorless approach slightly reduced the dynamic system response and, furthermore, the current THD for the chosen operating point was increased from 3.28 to 4.58 in comparison with that of using the capacitor voltage feedback.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacitor Voltage Balancing of a Grid-Tied, Cascaded Multilevel Converter with Binary Asymmetric Voltage Levels Using an Optimal One-Step-Ahead Switching-State Combination Approach

et al. 2022

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“…Thus, the performance of the system is compromised. In addition, the synchronous reference frame (SRF) [12], pulsewidth modulation technique [13], extended Kalman filter [14] etc. are generally used for control of grid connected converter for synchronisation of the grid.…”

Section: Introductionmentioning

confidence: 99%

Improving power quality of single phase utility grid connected to wind–PV system using multilayer‐frequency adaptive fundamental signal extractor

Gupta¹,

Murshid²,

Singh³

2020

IET Renewable Power Generation

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“…On the other hand, due to the reduced number of subject switches, the switching method of this topology is complex. The SHE is suggested to solve this problem in [23][24][25][26][27] and the NLC switching method is used in [28,29]. Although these methods of switching are more efficient in terms of reducing the total harmonic distortion (THD) of output voltage, these methods are offline and are used for lower switching frequency applications.…”

Section: Introductionmentioning

confidence: 99%

Modelling approach for multi‐carrier‐based pulse‐width modulation techniques utilised in asymmetrical cascaded H‐bridge inverters

Soltani

Pairo

Shoulaie

2019

IET Power Electronics

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The increasing use of medium-voltage drives and high-power equipment requires a detailed study on the switching method and topology of multi-level inverters. Asymmetric cascaded H-bridge topologies that have unequal input dc voltages with different devices in various parts of the cascaded H-bridge inverter (CHB) are representative of significant improvements in medium-voltage industrial drives. Various modulation strategies are used in multi-level power conversion applications. In the multi-carrier switching method for asymmetric CHB, the number of switches is less than carriers and is usually used in the offline switching method. These methods of switching are not applicable to online systems. In this study, equations for combining different pulse-width modulation (PWM) to use the controllability advantage of the multi-carrier method are introduced in asymmetric topologies. Then, the dual Fourier series equations are applied to model each inverter switching relation of the asymmetric cascaded blocks. To model each inverter switching relation of the asymmetric blocks using sinusoidal PWM, the dual Fourier series equations were applied. The presented analytical modelling switching method was validated using simulation and experimental case studies.

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A DC Link Sensor-Less Voltage Balancing Technique for Cascaded H-Bridge Multilevel Converters With Asymmetric Selective Harmonic Current Mitigation-PWM

Cited by 25 publications

References 21 publications

Capacitor Voltage Balancing of a Grid-Tied, Cascaded Multilevel Converter with Binary Asymmetric Voltage Levels Using an Optimal One-Step-Ahead Switching-State Combination Approach

Capacitor Voltage Balancing of a Grid-Tied, Cascaded Multilevel Converter with Binary Asymmetric Voltage Levels Using an Optimal One-Step-Ahead Switching-State Combination Approach

Improving power quality of single phase utility grid connected to wind–PV system using multilayer‐frequency adaptive fundamental signal extractor

Modelling approach for multi‐carrier‐based pulse‐width modulation techniques utilised in asymmetrical cascaded H‐bridge inverters

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