A multilevel soft-switching inverter with inductor coupling

Song, Byeong-Mun; Kim, Juhyung; Lai, Jih-Sheng; Seong, K.C.; Kim, Hae-Jong; Park, Sun-Soon

doi:10.1109/28.913730

Cited by 47 publications

(6 citation statements)

References 8 publications

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“…Modulation also depends upon modulation ratio (either over or under modulation), and the THD varies accordingly. Multiple techniques are proposed by authors in the literature depending upon the switching frequency, either fundamental or high frequency [187,188]. However, low losses are found when switched at fundamental or low frequency.…”

Section: Control and Modulation Schemesmentioning

confidence: 99%

Multilevel Inverter: A Survey on Classical and Advanced Topologies, Control Schemes, Applications to Power System and Future Prospects

et al. 2021

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In recent years, multilevel inverters (MLIs) have emerged to be the most empowered power transformation technology for numerous operations such as renewable energy resources (RERs), flexible AC transmission systems (FACTS), electric motor drives, etc. MLI has gained popularity in medium- to high-power operations because of numerous merits such as minimum harmonic contents, less dissipation of power from power electronic switches, and less electromagnetic interference (EMI) at the receiving end. The MLI possesses many essential advantages in comparison to a conventional two-level inverter, such as voltage profile enhancement, increased efficiency of the overall system, the capability of high-quality output generation with the reduced switching frequency, decreased total harmonic distortions (THD) without reducing the power of the inverter and use of very low ratings of the device. Although classical MLIs find their use in various vital key areas, newer MLI configurations have an expanding concern to the limited count of power electronic devices, gate drivers, and isolated DC sources. In this review article, an attempt has been made to focus on various aspects of MLIs such as different configurations, modulation techniques, the concept of new reduced switch count MLI topologies, applications regarding interface with renewable energy, motor drives, and FACTS controller. Further, deep insights for future prospective towards hassle-free addition of MLI technology towards more enhanced application for various fields of the power system have also been discussed. This article is believed to be extremely helpful for academics, researchers, and industrialists working in the direction of MLI technology.

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Section: Control and Modulation Schemesmentioning

confidence: 99%

Multilevel Inverter: A Survey on Classical and Advanced Topologies, Control Schemes, Applications to Power System and Future Prospects

et al. 2021

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“…The indicated voltage level in the flying-capacitor inverter is the same as like diode-clamped multilevel inverter [27]. Moreover, switching pairs may be different and asymmetrical according to the regulating policy, but the choice of the two pairs leads to the switching state redundancy, which may utilize to attain the voltage balancing of FC-MLI [2,[28][29]. The number of output voltage levels is increased through appending some additional switches and a capacitor.…”

Section: Flying-capacitor Multilevel Inverter (Fc-mli)mentioning

confidence: 99%

“…The number of output voltage levels is increased through appending some additional switches and a capacitor. Besides this, for FC-MLI (m-1) number of capacitors on a common DC-bus, where m is the level number of the inverter, and 2(m-1) switch-diode valve pairs are used, and [(m-1) (m-2)/2] clamping capacitors per phase are used [28,[30][31].…”

Section: Flying-capacitor Multilevel Inverter (Fc-mli)mentioning

confidence: 99%

Review of Multilevel Voltage Source Inverter Topologies and Analysis of Harmonics Distortions in FC-MLI

et al. 2019

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We review the most common topology of multi-level inverters. As is known, the conventional inverters are utilized to create an alternating current (AC) source from a direct current (DC) source. The two-level inverter provides various output voltages [(Vdc/2) and (−Vdc/2)] of the load. It is a successive method, but it makes the harmonic distortion of the output side, Electromagnetic interference (EMI), and high dv/dt. We solve this problem by constructing the sinusoidal voltage waveform. This is achieved by a “multilevel inverter” (MLI). The multilevel inverter creates the output voltage with multiple DC voltages as inputs. Many voltage levels are combined to produce a smoother waveform. During the last decade, the multilevel inverter has become very popular in medium and high-power applications with some advantages, such as the reduced power dissipation of switching elements, low harmonics, and low EMIs. We introduce the information about several multilevel inverters such as the diode-clamped multilevel inverter (DC-MLI), cascaded H-bridge multilevel inverter (CHB-MLI), and flying-capacitor multilevel inverter (FC-MLI) with Power systems CAD (PSCAD) simulation. It is shown that THD is 28.88% in three level FC-MLI while THD is 18.56% in five level topology. Therefore, we can decrease the total harmonic distortion adopting the higher-level topology.

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“…The second group of soft-switching systems includes solutions that support the switching processes individually in each phase of the given three-level inverter [7][8][9][10][11][12]. An advantage of these solutions is the ability to support switching processes in a wide range of output frequencies, especially when the inverter should operate with different methods of pulse width modulation.…”

Section: Introductionmentioning

confidence: 99%

“…Typically, soft-switching solutions have additional circuits containing, among others, capacitors connected to main switches [7,10,[13][14][15][16]. In the case of disturbances, one of the main switches may be turned ON at a non-zero voltage of the capacitor which is connected in parallel with this switch; as a result, the switch current may reach an unacceptable value.…”

Section: Introductionmentioning

confidence: 99%

A New Soft-Switching Solution in Three-Level Neutral-Point-Clamped Voltage Source Inverters

2021

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This paper presents a new soft-switching solution recommended for three-level neutral-point-clamped inverters. The operation principles of the proposed solution, working stages, selection of elements, and the control algorithm are comprehensively discussed herein. The control method of the inverter main switches is the same as that of the switches of an inverter operating according to the hard-switching technique. The correctness of the proposed solution was confirmed by the results of different tests using a laboratory neutral-point-clamped inverter with rated parameters of 3 kW, 2 × 150 V, 12 A, and 3 kHz. Numerical analyses were performed for the inverter of rated power 1.2 MW. The switching losses of the inverter operating with the proposed solution were compared with those of an inverter with hard-switching method. The proposed soft-switching solution increased the inverter efficiency and its competitiveness in relation to other proposals because there were no connections between switches and capacitors or inductors, which pose a risk of damaging the inverter when disturbances in the control system appear.

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A multilevel soft-switching inverter with inductor coupling

Cited by 47 publications

References 8 publications

Multilevel Inverter: A Survey on Classical and Advanced Topologies, Control Schemes, Applications to Power System and Future Prospects

Multilevel Inverter: A Survey on Classical and Advanced Topologies, Control Schemes, Applications to Power System and Future Prospects

Review of Multilevel Voltage Source Inverter Topologies and Analysis of Harmonics Distortions in FC-MLI

A New Soft-Switching Solution in Three-Level Neutral-Point-Clamped Voltage Source Inverters

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