Print Email Facebook Twitter Design of a power-electronic-assisted OLTC for grid voltage regulation Title Design of a power-electronic-assisted OLTC for grid voltage regulation Author Chandra Mouli, G.R. (TU Delft Old - EWI-ESE-DC&S DC systems & Storage) Bauer, P. (TU Delft Old - EWI-ESE-DC&S DC systems & Storage) Wijekoon, T (External organisation) Panosyan, A (External organisation) Bärthlein, EM (External organisation) Date 2015 Abstract High penetration of distributed generation (DG) has led to frequent voltage fluctuations in the distribution network. This paper describes the design of a partially rated, power-electronic-assisted onload tap-changing (OLTC) autotransformer. Positive and negative compensation of the grid voltage can be achieved on feeders that have high distributed generation and/or loading. A novel design of taps comprised of several no-load switches and a single semiconductor-mechanical hybrid switch have been proposed, that requires reduced voltage rating and a number of switches. In steady state, the mechanical switch in the hybrid switch conducts the load current resulting in low steady-state losses. During the tap change process, the OLTC uses semiconductor switches, namely insulated-gate bipolar transistor /metal-oxide semiconductor field-effect transistor, thus achieving arc-free tap change and long lifetime of switches. The OLTC system has been customized for both low-voltage and medium-voltage three-phase distribution networks. An open-delta configuration for the medium-voltage application has been proposed that requires only two OLTC units to control all three line voltages. Simulations are carried out to verify the steady-state and transient operation of the proposed OLTC. Subject Distributed power generationfour-step commutationhybrid switchonload tap changer (OLTC)series compensationtransformervoltage fluctuations To reference this document use: http://resolver.tudelft.nl/uuid:2fcf100a-fac1-44c0-a22b-b90c99d63517 DOI https://doi.org/10.1109/TPWRD.2014.2371539 ISSN 0885-8977 Source IEEE Transactions on Power Delivery, 30 (3), 1086-1095 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2015 G.R. Chandra Mouli, P. Bauer, T Wijekoon, A Panosyan, EM Bärthlein Files PDF 2917683_Design_of_a_power ... lation.pdf 1.91 MB Close viewer /islandora/object/uuid:2fcf100a-fac1-44c0-a22b-b90c99d63517/datastream/OBJ/view