A Zero Sequence Voltage Injection Method for Cascaded H-bridge D-STATCOM

Srinivasa Rao Yarlagadda; Mukesh Kumar Pathak

A Zero Sequence Voltage Injection Method for Cascaded H-bridge D-STATCOM

Srinivasa Rao Yarlagadda

Mukesh Kumar Pathak

Vol. 17, No. 4, pp. 1088-1096, Jul. 2017

10.6113/JPE.2019.17.4.1088

Cascaded H-bridge converter

Zero sequence voltage

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Abstract

Load variations on a distribution line result in voltage fluctuations at the point of common coupling (PCC). In order to keep the magnitude of the PCC voltage constant at its rated value and obtain zero voltage regulation (ZVR), a D-STATCOM is installed for voltage correction. Moreover, the ZVR mode of a D-STATCOM can also be used to balance the source current during unbalanced loading. For medium voltage and high power applications, a D-STATCOM is realized by the cascaded H-bridge topology. In the ZVR mode, the D-STATCOM may draw unbalanced current and in this process is required to handle different phase powers leading to deviations in the cluster voltages. Zero sequence voltage needs to be injected for ZVR mode, which creates circulating power among the phases of the D-STATCOM. The computed zero sequence voltage and the individual DC capacitor balancing controller help the DC cluster voltage follow the reference voltage. The effectiveness of the control scheme is verified by modeling the system in MATLAB/SIMULINK. The obtained simulations are further validated by the experimental results using a dSPACE DS1106 and five-level D-STATCOM experimental set up.

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Cite this article

[IEEE Style]

S. R. Yarlagadda and M. K. Pathak, "A Zero Sequence Voltage Injection Method for Cascaded H-bridge D-STATCOM," Journal of Power Electronics, vol. 17, no. 4, pp. 1088-1096, 2017. DOI: 10.6113/JPE.2019.17.4.1088.

[ACM Style]

Srinivasa Rao Yarlagadda and Mukesh Kumar Pathak. 2017. A Zero Sequence Voltage Injection Method for Cascaded H-bridge D-STATCOM. Journal of Power Electronics, 17, 4, (2017), 1088-1096. DOI: 10.6113/JPE.2019.17.4.1088.