Comparison of multicarrier PWM techniques for cascaded H-bridge inverter

Omer, Prabhu; Kumar, Jagdish; Surjan, Balwinder Singh

doi:10.1109/sceecs.2014.6804463

Cited by 23 publications

(8 citation statements)

References 20 publications

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“…Voltage and current quality for three-phase CHB inverters with equal DC sources for LS PWM are reported in the literature to be better than for PS PWM [13][14][15]. The presented frequency domain explanations seem to be complicated as they involve double Fourier series spectra calculations, sideband frequencies, etc.…”

Section: Current Thd For a Three-phase Chb Inverter With Non-equal DCmentioning

confidence: 99%

On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources

et al. 2019

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Cascade H-bridge (CHB) inverter is an attractive choice for integration of DC sources of different nature, e.g., for distributed generation with energy storage, photovoltaic generation, etc. In general, non-equal DC voltage sources can affect the total harmonic distortion (THD) of the CHB by introducing undesirable low-frequency subharmonics. This paper investigates different level-shifted (LS) and phase-shifted (PS) pulse width modulation (PWM) strategies for single-and three-phase cascade H-bridge inverters with non-equal DC sources from the load current THD minimization perspective. The best current quality is provided by LS PWM, as reported in the literature. The paper provides a simple time domain explanation of LS PWM superiority. However, PS PWM may be a preferable choice for practical applications due to fair power and loss sharing across individual H-bridges. The paper explains how to obtain the best current quality by PS PWM carriers' order arrangement (DC sources switching sequence selection).The paper is organized as follows. Section 2 presents the current THD calculation methodology for non-uniform voltage levels applicable to a single-phase cascade inverter in the case of LS PWM and non-equal DC sources. The analysis of the current THD with PS PWM and non-equal DC sources for the cascade H-bridge inverter is presented in Section 3. The analysis of current THD has been extended to a three-phase cascade H-bridge inverter with non-equal DC sources and presented in Section 4. Section 5 presents the conclusion. Current THD for a Single-Phase CHB Inverter with LS PWM and Non-Equal DC SourcesCurrent THD for a single-phase CHB inverter with LS PWM and equal DC sources can be calculated as suggested in [8] for uniformly distributed voltage levels. In this section, the results of [8] are generalized to acquire non-equal DC sources. For the best harmonic performance (minimal current THD), LS modulation bands must be adjusted to match non-equal DC source voltages (Figure 2).

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Section: Current Thd For a Three-phase Chb Inverter With Non-equal DCmentioning

confidence: 99%

On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources

et al. 2019

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“…When an MLI consists of multiple power sources and if each input source contributes equal power to the load then the power distribution among the sources is said to be 'even'. It is also called as 'charge balance control' or 'equal load sharing' [38]. Even power distribution can't be achieved in all topologies but is a feature of control only when the topology permits so.…”

Section: ) Even Power Distributionmentioning

confidence: 99%

A Review on Reduced Switch Count Multilevel Inverter Topologies

2020

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Multilevel Inverters (MLIs) are becoming more and more popular in medium and high power applications. This is due to several inherent advantages of MLI over two-level inverters such as high-quality output, lower device ratings, and several others. While the classical topologies are still having applications in most of the key areas, there is a growing interest in newer multilevel topologies with an objective of reducing power semiconductor device count, gate drivers and/or isolated DC sources. In this paper, a comprehensive review of some of the recently proposed newer multilevel inverter topologies with the abovementioned objectives is presented. In this article, a detailed investigation in terms of total power semiconductor switch count, number of DC sources, passive component requirement, highest switch voltage rating, total standing voltage etc. has been presented.

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“…It consists of three H-bridge converter cells connected in series, allowing the output voltage to be three times the DC source voltage of each cell. The modulation is accomplished with the phase shifted PWM as shown in [20]. With this topology, the effective inverter switching frequency is six times higher than the device switching frequency of each cell.…”

Section: A Topology Descriptionmentioning

confidence: 99%

“…The gains can be obtained as (20) with the same procedure as for the voltage control design. To define the control ability of the DC voltage on the CUT, the control strategy is mathematically analyzed in Table I, where C and I Cmax are the required values and L and V S are the designed values for satisfying the requirements mentioned in this section.…”

Section: B Control Strategy and Analysismentioning

confidence: 99%

Topology and control strategy for accelerated lifetime test setup of DC-link capacitor of wind turbine converter

Jedtberg

Buticchi

2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Back-to-back converters for wind turbine systems (WTS) feature capacitors in the DC-link to maintain a stable DClink voltage and to decouple the generator from the grid. Electrolytic and film capacitors can be chosen to this purpose. Long-term field experience and recorded failure data reveal that capacitor failures are one of the main reasons for the downtime of WTS. The ripple current accelerates the wear-out of the capacitors, which is strongly dependent on the mission profile of the system. Therefore, it becomes important to estimate the useful lifetime of a capacitor as a function of the ripple current. In this paper, aging characteristics of electrolytic capacitors are described, and a power converter topology and its control strategy are designed to perform accelerated lifetime tests. The voltage and ripple current of the capacitor under test (CUT) can be controlled with low THD to correlate wear-out with ripple.

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Comparison of multicarrier PWM techniques for cascaded H-bridge inverter

Cited by 23 publications

References 20 publications

On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources

On PWM Strategies and Current THD for Single- and Three-Phase Cascade H-Bridge Inverters with Non-Equal DC Sources

A Review on Reduced Switch Count Multilevel Inverter Topologies

Topology and control strategy for accelerated lifetime test setup of DC-link capacitor of wind turbine converter

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