Electrolytic capacitorless STATCOM with both inductive and capacitive VAR compensation modes

Mohammad Sameer Irfan; Young-Tae Jeon; Mohamed Atef Tawfik; Ashraf Ahmed; Joung-Hu Park

Electrolytic capacitorless STATCOM with both inductive and capacitive VAR compensation modes

Mohammad Sameer Irfan

Vol. 23, No. 8, pp. 1196-1210, Aug. 2023

10.1007/s43236-023-00650-y

STATCOM

Power decoupling

Flux cancellation method

VAR compensation

Abstract

This paper proposes an effective VAR source established as a cascaded H-bridge (CHB) static compensator (STATCOM), which is based on the flux cancellation method. The conventional CHB-STATCOM uses a low-frequency large capacitor as a source. The required capacitance value of the capacitor increases as a function of the amount of VAR produced to compensate the power system. The proposed topology is based on flux cancellation. Therefore, the source of VAR in this case is not limited by the capacitors or the power decoupling transformer size. The sub-module (SM) of the proposed topology comprises of a CHB module with power decoupling circuits. The double-frequency ripple powers on the sub-module (SM) capacitors, which have a phase shift of 120° with respect to each other. The ripple powers are derived from each of the three phases toward a common magnetic core to cancel each other out. An isolated bidirectional triple port dual half-bridge converter is utilized for the flux cancellation process. In this converter, the main challenges are leakage inductances and the high voltage insulation among the three windings of the high-frequency transformer. An αβ-frame-based model is proposed, using the generalized state-space averaging method, for the flux cancellation circuit. Furthermore, the size is significantly reduced by the proposed method, since a small sub-module capacitance of a few microfarads is sufficient to operate the CHBSTATCOM. The analysis and the controller design process are presented, followed by simulation and hardware validations.

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Cite this article

[IEEE Style]

M. S. Irfan, Y. Jeon, M. A. Tawfik, A. Ahmed, J. Park, "Electrolytic capacitorless STATCOM with both inductive and capacitive VAR compensation modes," Journal of Power Electronics, vol. 23, no. 8, pp. 1196-1210, 2023. DOI: 10.1007/s43236-023-00650-y.

[ACM Style]

Mohammad Sameer Irfan, Young-Tae Jeon, Mohamed Atef Tawfik, Ashraf Ahmed, and Joung-Hu Park. 2023. Electrolytic capacitorless STATCOM with both inductive and capacitive VAR compensation modes. Journal of Power Electronics, 23, 8, (2023), 1196-1210. DOI: 10.1007/s43236-023-00650-y.