Operating limits in multilevel MPC inverters with active front ends

Marchesoni, M.; Vaccaro, Luis

doi:10.1109/speedam.2010.5542193

Cited by 28 publications

(34 citation statements)

References 8 publications

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“…The balancing properties of the proposed VV PWM have been therefore experimentally verified for linear loads at operating points beyond the limits specified in [16] and [17] for NTV PWMs, in the case of a three-level converter [15], four-level converter [30], and five-level converter (see Fig. 12).…”

Section: Resultsmentioning

confidence: 99%

Pulsewidth Modulations for the Comprehensive Capacitor Voltage Balance of $n$-Level Three-Leg Diode-Clamped Converters

Busquets‐Monge

Alepuz

Rocabert

et al. 2009

IEEE Trans. Power Electron.

128

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Abstract-In the previous literature, the introduction of the virtual-space-vector (VV) concept for the three-level, three-leg neutral-point-clamped converter has led to the definition of pulsewidth modulation (PWM) strategies, guaranteeing a dc-link capacitor voltage balance in every switching cycle under any type of load, with the only requirement being that the addition of the three phase currents equals zero. This paper presents the definition of the VVs for the general case of an n-level converter, suggests guidelines for designing VV PWM strategies, and provides the expressions of the leg duty-ratio waveforms corresponding to this family of PWMs for an easy implementation. Modulations defined upon these vectors enable the use of diode-clamped topologies with passive front-ends. The performance of these converters operated with the proposed PWMs is compared to the performance of alternative designs through analysis, simulation, and experiments.

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Section: Resultsmentioning

confidence: 99%

Pulsewidth Modulations for the Comprehensive Capacitor Voltage Balance of $n$-Level Three-Leg Diode-Clamped Converters

Busquets‐Monge

Alepuz

Rocabert

et al. 2009

IEEE Trans. Power Electron.

128

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“…Therefore, the DC capacitors voltage balancing is required under all conditions, which determines both the safety and efficiency of DCMCs. Two possible solutions of the voltage imbalance exist: (i) installing of voltage balancing circuits on the converter DC side [20,21,32] and (ii) modifying the converter switching pattern according to a control strategy [31,33]. The latter is preferable in terms of cost, as the former requires additional power hardware, which adds to cost and complexity.…”

Section: Disadvantagesmentioning

confidence: 99%

“…However, reactive power control would be influence if priority were given to voltage balancing. Further, the switching pattern modification strategy cannot be used to control the capacitor voltages, except at low modulation indices [31]. It is also to be noted that for the applications like UPFC, where two such converters are back-to-back connected, the switching modification strategy necessitates the two converters to operate at a fixed AC voltage ratio for the capacitor voltages equalization.…”

Section: Disadvantagesmentioning

confidence: 99%

Multilevel Converter Topologies for STATCOMs

Shukla

Nami

2014

Static Compensators (STATCOMs) in Power Systems

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To implement the STATCOMs for transmission and distribution applications, high power converters are needed. A multilevel converter is a logical choice for such applications as it can meet the imposed line side current and voltage harmonic distortion standards without extending its device ratings. Several types of monolithic multilevel converters have been proposed based on different structures of a DC link voltage (or current) to generate staircase output voltage (or current) levels. The multilevel current source converters (CSC) are also a potential configuration for STATCOM. Multilevel CSCs using fully controllable switches have the advantages of low output harmonics and controllable active and reactive power. During the last decade, modular multilevel converters have shown a breakthrough and have made their way to commercial high power applications. Modularity, in general, refers to a technique to develop comparably large systems by combining smaller subsystems. For power converter topologies, this means, a cascaded connection of converter cells seems to be an interesting solution to reach high voltage and high quality waveforms with a minimum complexity. This chapter provides an overview on monolithic and modular multilevel converter topologies, targeting high-power applications and in particular STATCOM. Modular multilevel converters can be built either straightforward by applying the modular building block cells or by a combination of cells with monolithic multilevel topologies. The monolithic and modular CSCs can also be realized by employing the duality concept on each corresponding Voltage Source Converter (VSC). This chapter summarizes the most recent developments made for multilevel converter A. Shukla (&)

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“…Focusing on the back-to-back converter, although the particular connection of the rectifier and the inverter might yield a natural compensation of the voltage unbalance, this configuration is only able to achieve an acceptable voltage balancing including a suitable controller or modulation strategy [18][19][20]. Thus, the most popular method to mitigate the voltage imbalance is the use of modulation strategies based on the exploitation of the redundant switching states of the converter [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…The mathematical analysis derived enables the use of classical control theory to design the controller. Thereby, it provides an alternative approach to deal with the problem, compared with the strategies usually considered and previously mentioned [18][19][20][21][22].…”

Section: Introductionmentioning

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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Operating limits in multilevel MPC inverters with active front ends

Cited by 28 publications

References 8 publications

Pulsewidth Modulations for the Comprehensive Capacitor Voltage Balance of $n$-Level Three-Leg Diode-Clamped Converters

Pulsewidth Modulations for the Comprehensive Capacitor Voltage Balance of $n$-Level Three-Leg Diode-Clamped Converters

Multilevel Converter Topologies for STATCOMs

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

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