4.8 Article

Series-Shunt Multiport Soft Normally Open Points

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 70, Issue 11, Pages 10811-10821

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3229375

Keywords

Multiport converter; power flow regulation; soft normally open points (SNOPs)

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Soft normally open point (SNOP) is an emerging solution for distributed networks (DNs) to address voltage violation and feeder congestion caused by the increasing integration of distributed energy resources and new types of loads. Based on the cascaded H-bridge structure and series-shunt arrangement, the proposed series-shunt multiport SNOP (S-2-MSNOP) can easily extend its ports by increasing the number of submodules with small power ratings, reducing the device cost and volume. Verifications on both simulation and experimental platforms prove the feasibility and effectiveness of the S-2-MSNOP.
Soft normally open point (SNOP) is an emerging solution for distributed networks (DNs) to address voltage violation and feeder congestion caused by the increasing integration of distributed energy resources and new types of loads. Based on power electronics, SNOPs can substitute traditional tie switches for power flow regulation, voltage adjustment, and power quality improvement, enhancing the DNs' controllability and flexibility. Existing SNOPs found in demonstration projects and the literature are generally based on the back-to-back voltage-source converter (VSC). Because it requires more full-power-rating VSCs as the number of connected feeders increases, this solution is uneconomical in multifeeder flexible interconnection scenarios due to the high device cost and volume. Alternatively, this article proposes a series-shunt multiport SNOP (S-2-MSNOP) based on a cascaded H-bridge structure and series-shunt arrangement. The proposed topology can easily extend its ports by increasing the number of submodules with small power ratings, reducing the device cost and volume. The operation principles and control strategies of the S-2-MSNOP are elaborated. Verifications on both a 1-MVA simulation model and a 3.3-kVA scaled-down experimental platform prove the feasibility and effectiveness of the S-2-MSNOP.

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