Current limit strategy of voltage controller of delta-connected H-bridge STATCOM under unbalanced voltage drop

Gum Tae Son, Jung Wook Park

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1 Citation (Scopus)

Abstract

This paper presents the current limit strategy of voltage controller of delta-connected H-bridge static synchronous compensator (STATCOM) under an unbalanced voltage fault event. When phase to ground fault happens, the feasibility to heighten the magnitude of sagging phase voltage is considered by using symmetric transformation method in delta-structure STATCOM. And the efficiency to cover the maximum physical current limit of switching device is considered by using vector analysis method that calculate the zero sequence current for balancing the cluster energy in delta connected H-bridge STATCOM. The result is simple and obvious. Only positive sequence current has to be used to support the unbalanced voltage sag. Although the relationship between combination of the negative sequence voltage with current and zero sequence current is nonlinear, the more negative sequence current is supplying, the larger zero sequence current is required. From the full-model STATCOM system simulation, zero sequence current demand is identified according to a ratio of positive and negative sequence compensating current. When only positive sequence current support voltage sag, the least zero sequence current is needed.

Original languageEnglish
Pages (from-to)550-558
Number of pages9
JournalJournal of Electrical Engineering and Technology
Volume13
Issue number2
DOIs
Publication statusPublished - 2018 Mar

Bibliographical note

Funding Information:
This work wasupportedinpartbytheNational Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2016R1E1A1A02920095) and in part by the Power Generation & Electricity Delivery Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20171220100330).

Funding Information:
This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2016R1E1A1A02920095) and in part by the Power Generation & Electricity Delivery Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20171220100330).

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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