Adaptive volt–var control in smart pv inverter for mitigating voltage unbalance at pcc using multiagent deep reinforcement learning

Yoongun Jung, Changhee Han, Dongwon Lee, Sungyoon Song, Gilsoo Jang

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Modern distribution networks face an increasing number of challenges in maintaining balanced grid voltages because of the rapid increase in single-phase distributed generators. Because of the proliferation of inverter-based resources, such as photovoltaic (PV) resources, in distribution networks, a novel method is proposed for mitigating voltage unbalance at the point of common coupling by tuning the volt–var curve of each PV inverter through a day-ahead deep reinforcement learning training platform with forecast data in a digital twin grid. The proposed strategy uses proximal policy optimization, which can effectively search for a global optimal solution. Deep reinforcement learning has a major advantage in that the calculation time required to derive an optimal action in the smart inverter can be significantly reduced. In the proposed framework, multiple agents with multiple inverters require information on the load consumption and active power output of each PV inverter. The results demonstrate the effectiveness of the proposed control strategy on the modified IEEE 13 standard bus systems with time-varying load and PV profiles. A comparison of the effect on voltage unbalance mitigation shows that the proposed inverter can address voltage unbalance issues more efficiently than a fixed droop inverter.

Original languageEnglish
Article number8979
JournalApplied Sciences (Switzerland)
Volume11
Issue number19
DOIs
Publication statusPublished - 2021 Oct 1

Keywords

  • Multiagent proximal policy optimization
  • Smart PV inverter
  • Voltage unbalance
  • Volt–var curve control

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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