The age of multilevel converters arrives

Franquelo, Leopoldo G.; Rodríguez, José; Leon, Jose I.; Kouro, Samir; Portillo, R.; Prats, Ma.A.M.

doi:10.1109/mie.2008.923519

Cited by 1,771 publications

(744 citation statements)

References 79 publications

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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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“…In this fourth and last control method, the frequencies 3ω r and 3ω i of the sinusoidal disturbances (15) and (16) are assumed to be unknown constant values. Therefore, two new fixed parameters that should be estimated appear in the system.…”

Section: Estimation Of Unknown Frequency Disturbances Applying An Adamentioning

confidence: 99%

Asymptotic rejection of sinusoidal disturbances based voltage balance control in back-to-back power converters

Umbría

Gordillo

Salas

et al. 2013

Int. J. Robust. Nonlinear Control

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SUMMARYThis paper addresses the imbalance problem of the dc-link capacitor voltages in the three-level diodeclamped back-to-back power converter. In order to cope with it, a mathematical analysis of the capacitor voltage difference dynamics, based on a continuous model of the converter, is first carried out. It leads to an approximated model which contains explicitly several sinusoidal functions of time. In view of this result, the voltage imbalance phenomenon can be addressed as an output regulation problem, considering the sinusoidal functions as exogenous disturbances. Thus, a novel approach to deal with the mentioned problem in the backto-back converter is presented. Then, the particular features of the disturbances are used to design several controllers. They all follow an asymptotic disturbance rejection approach. In this way, the estimations of the disturbances are used to apply a control law that cancels them while regulating the capacitor voltage balance as well. Finally, the performance of the proposed control laws is evaluated, presenting the simulation results obtained when the different controllers are implemented.

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“…A new age of converters i.e. multilevel structure is gaining lot of popularity because of its excellent performance in terms of improved power quality, less ripple in regulated dc output voltage, reduced voltage stress across switch, reduced dv/dt and low electromagnetic interference with neighbouring communication lines as compared to its counterpart 2-level HPFCs [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Neutral Point Potential Control for Three Phase 3 - level Neutral Point Clamped Active Front End Converter

Ojha¹,

Chaturvedi²,

Mittal³

et al. 2017

ijeei

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The use of power electronic converters influences the generation of harmonics and reactive power flow in power system. Therefore, three-phase multilevel improved power quality AC-DC converters are gaining lot of popularity in power conversion applications. This work deals with critical problem of multilevel structure i.e neutral point potential (NPP) variation. In this paper, a simplified current controlled scheme is presented to ensure unity power factor operation. Neutral point potential (NPP) of three-phase, 3-level NPC AC-DC converter is controlled by modifying control signal in the controller using NPP regulator. An auxiliary circuit is being presented in this paper as an alternative option for controlling the neutral point potential of the converter. Comparison has been carried out between these control techniques in terms of power quality. A complete mathematical model is presented for better understanding of both techniques used for NPP control. The presented control techniques has been verified through simulation investigations and validated experimentally on the developed laboratory prototype.

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The age of multilevel converters arrives

Cited by 1,771 publications

References 79 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

Asymptotic rejection of sinusoidal disturbances based voltage balance control in back-to-back power converters

Neutral Point Potential Control for Three Phase 3 - level Neutral Point Clamped Active Front End Converter

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