Optimal decoupled discontinuous modulation for StatComs based on the cascaded H-bridge converter

Optimal decoupled discontinuous modulation for StatComs based on the cascaded H-bridge converter

Conventional discontinuous pulsewidth modulation (DPWM) strategies for cascaded H-bridge static compensators suffer from poor inter-phase capacitor voltage balance control during unbalanced grid voltage conditions. Specifically, the logic-based algorithm that calculates the zero-sequence voltage (ZS...

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Bibliographic Details
Main Authors: Liu, Qingxiang, Rodriguez, Ezequiel, Farivar, Glen G., Townsend, Christopher D., Pou, Josep, Leyva, Ramon
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2023
Subjects:
Engineering::Electrical and electronic engineering
Discontinuous Pulsewidth Modulation
Static Compensator
Online Access:https://hdl.handle.net/10356/172342
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Institution: Nanyang Technological University
Language: English
Description
Summary:Conventional discontinuous pulsewidth modulation (DPWM) strategies for cascaded H-bridge static compensators suffer from poor inter-phase capacitor voltage balance control during unbalanced grid voltage conditions. Specifically, the logic-based algorithm that calculates the zero-sequence voltage (ZSV) for discontinuous operation interacts with the closed-loop capacitor voltage control. This article proposes an optimal DPWM strategy based on a finite-set optimization that chooses the best ZSV candidate that minimizes the control interactions while clamping a converter voltage. Furthermore, the effect of the different ZSV candidates on the switching loss is also considered within the optimization. Extensive experimental study is provided to demonstrate the effectiveness of the proposed approach.

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