Optimal Planning of Hybrid AC/DC Low-Voltage Distribution Networks Considering DC Conversion of Three-Phase Four-Wire Low-Voltage AC Systems

Bo Zhang, Lu Zhang, Wei Tang*, Gen Li, Chen Wang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The increasing integration of distributed household photovoltaics (PVs) and electric vehicles (EVs) may further aggravate voltage violations and unbalance of low-voltage distribution networks (LVDNs). DC distribution networks can increase the accommodation of PVs and EVs and mitigate mutilple power quality problems by the flexible power regulation capability of voltage source converters. This paper proposes schemes to establish hybrid AC/DC LVDNs considering the conversion of the existing three-phase four-wire low-voltage AC systems to DC operation. The characteristics and DC conversion constraints of typical LVDNs are analyzed. In addition, converter configurations for typical LVDNs are proposed based on the three-phase four-wire characteristics and quantitative analysis of various DC configurations. Moreover, an optimal planning method of hybrid AC/DC LVDNs is proposed, which is modeled as a bi-level programming model considering the annual investments and three-phase unbalance. Simulations are conducted to verify the effectiveness of the proposed optimal planning method. Simulation results show that the proposed optimal planning method can increase the integration of PVs while simultaneously reducing issues related to voltage violation and unbalance.
Original languageEnglish
JournalJournal of Modern Power Systems and Clean Energy
Volume12
Issue number1
Pages (from-to)141-153
Number of pages13
ISSN2196-5625
DOIs
Publication statusPublished - 2024

Keywords

  • Optimal planning
  • Low-voltage distribution network
  • Three-phase unbalance
  • DC conversion

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