Medium-Voltage Multilevel Converters—State of the Art, Challenges, and Requirements in Industrial Applications

Abu‐Rub, Haitham; Holtz, J.; Rodríguez, José; Ge, Baoming

doi:10.1109/tie.2010.2043039

Cited by 1,134 publications

(386 citation statements)

References 163 publications

(325 reference statements)

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“…Multilevel inverters can produce high voltage with lower harmonics and lower stress on power switches 1 . The most common multilevel inverter topologies are cascaded H-bridge (CHB), neutral point clamped (NPC), and flying capacitors (FC) [2][3][4] . Packed U cells (PUC) are recent developed multilevel inverters with reduced number of capacitors and power devices [5][6][7][8][9][10] .…”

Section: A New Family Of Multilevel Grid Connected Inverters Based Onmentioning

confidence: 99%

A New Family of Multilevel Grid Connected Inverters Based on Packed U Cell Topology

Pakdel

Jalilzadeh

2017

Sci Rep

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In this paper a novel packed U cell (PUC) based multilevel grid connected inverter is proposed. Unlike the U cell arrangement which consists of two power switches and one capacitor, in the proposed converter topology a lower DC power supply from renewable energy resources such as photovoltaic arrays (PV) is used as a base power source. The proposed topology offers higher efficiency and lower cost using a small number of power switches and a lower DC power source which is supplied from renewable energy resources. Other capacitor voltages are extracted from the base lower DC power source using isolated DC-DC power converters. The operation principle of proposed transformerless multilevel grid connected inverter is analyzed theoretically. Operation of the proposed multilevel grid connected inverter is verified through simulation studies. An experimental prototype using STM32F407 discovery controller board is performed to verify the simulation results.Multilevel inverters are the most suitable solution for grid connection of renewable energy resources such as photovoltaic arrays (PV) or wind turbines. Multilevel inverters can produce high voltage with lower harmonics and lower stress on power switches 1 . The most common multilevel inverter topologies are cascaded H-bridge (CHB), neutral point clamped (NPC), and flying capacitors (FC) 2-4 . Packed U cells (PUC) are recent developed multilevel inverters with reduced number of capacitors and power devices [5][6][7][8][9][10] . The PUC topology needs only one high voltage DC power supply and the lower voltage levels are automatically generated with switching operation in packed U cell capacitors. However, the CHB inverter requires many DC power sources 11 . With equal number of voltage levels, the PUC inverter requires half of power supplies and one third of capacitors compared with FC topology 12 . Furthermore, in the PUC inverter the zero voltage level in freewheeling period can be achieved without using extra power switches. Therefore, the common mode voltage (CMV) will be zero in freewheeling period; as a result the ground leakage current will be declined significantly.In this paper a novel PUC based multilevel inverter is proposed. Unlike the PUC topology, a lower DC power supply from renewable energy resources such as photovoltaic arrays (PV) is used as a base power source. In fact, other power sources are extracted from the base lower DC power supply using isolated DC-DC power converters. In this case, the output peak voltage will be the summation of lower DC power supply and individual DC power sources extracted from the base power source via isolated DC-DC power converters. Moreover, the DC source voltages are the integer multiples of the lowest DC power supply. Therefore, in contrast with the PUC topology with a higher DC voltage source, in the proposed multilevel inverter, multiple low voltage DC power supplies are used.Moreover, only a lower DC source and multiple isolated push-pull or forward DC-DC converters can be used instead of a higher DC voltage supp...

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Section: A New Family Of Multilevel Grid Connected Inverters Based Onmentioning

confidence: 99%

A New Family of Multilevel Grid Connected Inverters Based on Packed U Cell Topology

Pakdel

Jalilzadeh

2017

Sci Rep

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“…The problem may be defined as follows: with input voltages as in (1), the MC switching angles equations will be formulated so that the first harmonic of the output voltages will be as in (2). The switching angles of the eighteen bidirectional switches S xyz (where x=1,2 represents the index of the number of winding (double star); y=1,2,3 represents the index of the output voltage and z=1,2,3 represents the index of the input voltage) which will be calculated, must comply with the following rules [13]:…”

Section: Six-to-three Phase Matrix Converter Modelmentioning

confidence: 99%

“…Compared with conventional three-phase machines, multiphase machines with sinusoidal spatial magnetomotive force distribution have lower space harmonics, greater fault tolerance, lower pulsating torque, and lower per phase power ratings for given power [1][2][3][4]. Multiphase generators have been studied much less than multiphase variable-speed drives and this remains to be an interesting topic, especially for WECS.…”

Section: Introductionmentioning

confidence: 99%

Multiphase Wind Energy Conversion Systems Based on Matrix Converter

Djahbar¹,

Zégaoui²,

Aillerie

2016

Automatika Journal

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“…There are several basic configurations for multi-level inverters, and each of them has its advantages and disadvantages versus the others [1][2][3][4]. One of the configurations is the Neutral Point Clamped (NPC) multi-level inverter [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Novel Asymmetrical Pulse Width Modulation Method

Baimel

Tapuchi

2017

MATEC Web Conf.

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Abstract. The paper proposes new asymmetrical PWM that can be used for operation of multilevel inverters. The working and construction principle of this PWM is demonstrated on 13-level PWM signal that is applied to nine-level inverter and operates it as 13-level inverter. The proposed PWM signal consists of 5-level hybrid PWM which is constructed from two PWM signals-combined parts of the standard 5-level Phase Disposition (PD) PWM and pulsed PWM. The sum of these two PWM signals produces the desired 13-level PWM signal that is applied to the 9-level cascaded inverter. The proposed PWM method allows reduction of 13-level inverter components compared to the standard topologies such as neutral point clamped or flying capacitor inverters. This results in smaller size, weight and cists of the inverter.. Extensive simulation results validate the practicability of the proposed PWM method. The proposed method can be extended to any desired number of levels.

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Medium-Voltage Multilevel Converters—State of the Art, Challenges, and Requirements in Industrial Applications

Cited by 1,134 publications

References 163 publications

A New Family of Multilevel Grid Connected Inverters Based on Packed U Cell Topology

A New Family of Multilevel Grid Connected Inverters Based on Packed U Cell Topology

Multiphase Wind Energy Conversion Systems Based on Matrix Converter

Novel Asymmetrical Pulse Width Modulation Method

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