Single-Phase Multilevel PWM Inverter Topologies Using Coupled Inductors

Salmon, John; Knight, A.M.; Ewanchuk, Jeffrey

doi:10.1109/tpel.2008.2012110

Cited by 94 publications

(43 citation statements)

References 21 publications

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“…The sum of the currents through both inductors has twice the switching frequency of the switches. The normalized equation of the current ripple in the inductor L 1 , defined by (5) is represented by (6) (6) Equation (6) is illustrated graphically in Fig. 8 for some values of the modulation index for a half cycle of the output voltage.…”

Section: B Current Ripple In the Magnetic Elementsmentioning

confidence: 99%

“…The interleaved converters with magnetic coupling, are found in the technical literature in two forms: interleaved converters with coupled inductors [6][7][8] and interleaved converters using magnetically coupled cells via an autotransformer ("Intercell Transformer" -ICT) [9,10]. The analysis of the NPC-MSSC topology using an autotransformer was performed [11].…”

Section: Introductionmentioning

confidence: 99%

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Comparative evaluation of three single-phase NPC inverters

Neto

Bascope

Cruz

et al. 2012

2012 10th IEEE/IAS International Conference on Industry Applications

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In this paper is presented a comparative evaluation in steady-state of three single-phase NPC multilevel inverters. The first is a five-level neutral point clamped (NPC) inverter based on multi-stage switching cell (MSSC); the second is also a five-level neutral point clamped (NPC) inverter based on interleaved cell (IC); and the third is a three-level neutral point clamped (NPC) inverter based on paralleled cell (PC). For this comparative purpose, the switching frequency is constant and the evaluated parameters are the volume of the heatsinks and the passive components, the total harmonic distortion (THD) of the output voltage, the power density and efficiency of each topology. Theoretical analyses, as well as simulation and experimental results obtained from 5kW prototype are presented.

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Section: B Current Ripple In the Magnetic Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of three single-phase NPC inverters

Neto

Bascope

Cruz

et al. 2012

2012 10th IEEE/IAS International Conference on Industry Applications

View full text Add to dashboard Cite

show abstract

“…In addition, output voltages can be filtered using small reactive components. The switching frequencies of devices can be reduced, and more sinusoidalshaped output voltage waves can be obtained [10], [11]. Multilevel inverters are now preferred in high power medium voltage applications due to the reduced voltage stresses on devices.…”

Section: Introductionmentioning

confidence: 99%

PWM Control Techniques for Single-Phase Multilevel Inverter Based Controlled DC Cells

Sayed¹,

Ahmed²,

Elsheikh³

et al. 2016

Journal of Power Electronics

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This paper presents a single-phase five-level inverter controlled by two novel pulse width modulation (PWM) switching techniques. The proposed PWM techniques are designed based on minimum switching power loss and minimum total harmonic distortion (THD). In a single-phase five-level inverter employing six switches, the first proposed PWM technique requires four switches to operate at switching frequency and two other switches to operate at line frequency. The second proposed PWM technique requires only two switches to operate at switching frequency and the rest of the switches to operate at line frequency. Compared with conventional PWM techniques for single-phase five-level inverters, the proposed PWM techniques offer high efficiency and low harmonic components in the output voltage. The validity of the proposed PWM switching techniques in controlling single-phase five-level inverters to regulate load voltage is verified experimentally using a 100 V, 500 W laboratory prototype controlled by dspace 1103.

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“…The CII claims to provide the following benefits [12]: multilevel PWM using half the power electronics of alternative topologies; lower highfrequency current ripple and lower ac filter inductor sizes; elimination of dc-rail shoot through conditions. A 3-limb core lowers the size of the magnetics used as compared to a system with three separate toroidal inductors [9].…”

Section: Introductionmentioning

confidence: 99%

A Preprocessed PWM Scheme for Three-Limb Core Coupled Inductor Inverters

Perera

Haque

Salmon

2016

IEEE Trans. on Ind. Applicat.

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A discontinuous PWM scheme is presented for a 6-switch 3-limb coupled inductor inverter. 3-level PWM phase output voltages are produced with a reduced switch count and reduced dv/dt stresses on loads and output filters. The PWM scheme described lowers the coupled inductor and semiconductor losses by lowering the inductor winding high-frequency current ripple using two techniques: winding excitation flipping (WEF) within each carrier cycle; the inductor magnetic flux is kept within the 3-limb core, neglecting natural leakage, by avoiding switching states that produce common-mode voltage excitation of the 3-limb inductor. To make best use of the non-standard switching patterns produced, reference signals are pre-processed before being delivered to the PWM modules using only one carrier signal: representing an approach well suited for implementation in a low-cost DSP. The digital output signals of each PWM module represent the desired switching states of each switch in the inverter. This approach contrast with previous published work, where post-processing of the PWM module output signals is necessary using digital logic circuitry such as an FPGA. Experimental results, with inductor loss and inverter efficiency comparisons for different operating conditions, confirm that the three-phase 6-switch inverter PWM patterns lower the highfrequency current ripple in the inductor windings, and hence, significantly lower the inverter losses and increase the power conversion efficiency.

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Single-Phase Multilevel PWM Inverter Topologies Using Coupled Inductors

Cited by 94 publications

References 21 publications

Comparative evaluation of three single-phase NPC inverters

Comparative evaluation of three single-phase NPC inverters

PWM Control Techniques for Single-Phase Multilevel Inverter Based Controlled DC Cells

A Preprocessed PWM Scheme for Three-Limb Core Coupled Inductor Inverters

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