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• W2415686970 abstract "In the last decade, particular attention has been paid to the use of Modular Multilevel Converters(MMC) for grid applications. In particular, for STATCOM applications the phase leg ofthe converter is constituted by a number of single-phase full-bridge converters connected incascade (here named Cascaded H-Bridge, CHB, converter). This multilevel converter topologyis today considered the industrial standard for STATCOM applications and has replaced otherconverter topologies, mainly due to its small footprint, high achievable voltage levels (allowingtransformer-less operation), modularity and reduced losses. However, there are still areas ofresearch that need to be investigated in order to improve the performance and the operationalrange of this converter topology for grid-applications. The aim of this thesis is to explore controland modulation schemes for the CHB-STATCOM, both under balanced and unbalancedconditions of the grid, highlighting the advantages but also the challenges and possible pitfallsthat this kind of topology presents for this specific application.The first part of the thesis is dedicated to the two main modulation techniques for the CHBSTATCOM:the Phase-Shifted PulseWidthModulation (PS-PWM) and the Level-Shifted PWM(LS-PWM) with cells sorting. In particular, the focus is on the impact of the adopted modulationon the active power distribution on the individual cells of the converter. When using PS-PWM,it is shown that non-ideal cancellation of the switching harmonics leads to a non-uniform activepower distribution among the cells and thereby to the need for an additional control loop forindividual DC-link voltage balancing. Theoretical analysis proves that a proper selection of thefrequency modulation ratio leads to a more even power distribution over time, which in turnsalleviates the role of the individual balancing control. Both PS-PWM and cells sorting schemesfail in cell voltage balancing when the converter is not exchanging reactive power with thegrid (converter in zero-current mode). To overcome this problem, two methods for individualDC-link voltage balancing at zero-current mode are proposed and verified.Then, the thesis focuses on the operation of the CHB-STATCOM under unbalanced conditions.It is shown analytically that regardless of the configuration utilized for the CHB-STATCOM(star or in delta configuration), a singularity exists when trying to guarantee balancing in theDC-link capacitor voltages. In particular, it is shown that the star configuration is sensitive tothe level of unbalance in the current exchanged with the grid, with a singularity in the solutionwhen positive- and negative-sequence currents have the same magnitude. Similar results arefound for the delta configuration where, in a pure duality with the star configuration, the systemis found to be sensitive to the level of unbalance in the applied voltage. The presence of thesesingularities represents an important limit of this topology for STATCOM applications." @default.
• W2415686970 created "2016-06-24" @default.
• W2415686970 creator A5046510631 @default.
• W2415686970 date "2016-01-01" @default.
• W2415686970 modified "2023-09-26" @default.
• W2415686970 title "Operation and control of cascaded H-bridge converter for STATCOM application" @default.
• W2415686970 hasPublicationYear "2016" @default.
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