Discontinuous-PWM Method for Multilevel $N$-Cell Cascaded H-Bridge Converters

Márquez, Antonio J.; Monopoli, Vito Giuseppe; Tcai, Anatolii; Leon, Jose I.; Buticchi, Giampaolo; Vázquez, Sergio; Liserre, Marco; Franquelo, Leopoldo G.

doi:10.1109/tie.2020.3016245

Cited by 19 publications

(13 citation statements)

References 26 publications

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“…For optimizing the THD in the presence of unbalanced operation conditions, a generalized harmonic control has been proposed, which minimizes the THD in these conditions [23]. Discontinuous modulation was proposed for regulating thermal stress for the components in the different building blocks and for processing different power in the different cells [2], [3] and even generalization to an arbitrary number of cells has been proposed [24].…”

Section: Power Imbalance In the H-bridgesmentioning

confidence: 99%

Modulation for Cascaded Multilevel Converters in PV Applications With High Input Power Imbalance

Andresen

Wang

et al. 2021

IEEE Trans. Power Electron.

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Cascaded multilevel inverters, such as the cascaded H-Bridge (CHB) converter, are an attractive solution for multistring photovoltaic (PV) systems, because they enable direct connection to the medium voltage grid and maximum power point tracking of multiple strings. As a challenge of the topology, the operation with high power imbalance in the strings is constrained by the over-modulation. This limitation is analyzed for sinusoidal modulation and the impact on the maximum power imbalance is demonstrated. For increasing the operating range with maximum power tracking in the strings, a discontinuous modulation with extended maximum power imbalance and reduced losses is proposed. The method is analyzed in terms of maximum power imbalance, efficiency and power quality. In addition, the method is validated on an experimental test bench.

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Section: Power Imbalance In the H-bridgesmentioning

confidence: 99%

Modulation for Cascaded Multilevel Converters in PV Applications With High Input Power Imbalance

Andresen

Wang

et al. 2021

IEEE Trans. Power Electron.

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“…D iscontinuous modulation (DM) is achieved by injecting a suitable voltage offset to clamp the ac-side converter voltage to the dc-rail [1]- [9]. In a three-phase system, zerosequence voltage injection provides the degree of freedom to clamp the phase arms without affecting the fundamental component of the output currents [3]- [9].…”

Section: Introductionmentioning

confidence: 99%

“…In a three-phase system, zerosequence voltage injection provides the degree of freedom to clamp the phase arms without affecting the fundamental component of the output currents [3]- [9]. As no switching losses in the clamped submodules (SMs) are produced during the clamping periods, DM normally reduces the overall switching losses [1]- [9]. [1] and [2] propose DM strategies for single-phase cascaded H-bridge (CHB) converters to clamp a given number of SMs.…”

Section: Introductionmentioning

confidence: 99%

“…As no switching losses in the clamped submodules (SMs) are produced during the clamping periods, DM normally reduces the overall switching losses [1]- [9]. [1] and [2] propose DM strategies for single-phase cascaded H-bridge (CHB) converters to clamp a given number of SMs. Obviously, in single-phase systems, zero-sequence voltage does not exist, but this partial clamping strategy shows improved performance.…”

Section: Introductionmentioning

confidence: 99%

“…Obviously, in single-phase systems, zero-sequence voltage does not exist, but this partial clamping strategy shows improved performance. Particularly, [1] focuses on improving the converter output voltage quality, while [2] aims at reducing the converter thermal stress. Zero-sequence voltage injection is implemented in [3] to improve the ride through capability of SM failures in CHB-StatComs with star configuration.…”

Section: Introductionmentioning

confidence: 99%

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Discontinuous Modulation of a Cascaded H-Bridge Low-Capacitance StatCom

Liu

Rodriguez

Farivar

et al. 2022

IEEE Trans. Power Electron.

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This paper presents a discontinuous modulation (DM) strategy for static compensators (StatComs) based on a cascaded H-bridge (CHB) converter with star configuration. The proposed DM strategy considers the capacitor voltage oscillations at twice the fundamental frequency and the effect of zerosequence voltage injection on the capacitor voltages. Considering these effects is especially important in CHB-StatComs with large capacitor voltage ripples (low capacitance StatComs), where the assumption of a constant dc-link voltage, which is the basis of conventional DM strategies, does not apply. The paper also describes a coherent set of steady-state waveforms for CHB-StatComs under DM. In addition to the well-known benefit of reducing the switching losses, the proposed DM also reduces the dc-link capacitors size and extends the operating range. The viability of the proposed DM strategy is verified experimentally on a small-scale prototype. In addition, simulation results are obtained using a real-scale system to study feasibility of the DM under unbalanced conditions.

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