Distributed Weight-Average-Prediction Control and Stability Analysis for an Islanded Microgrid with Communication Time Delay

Weitao Yao, Yu Wang, Yan Xu, Chao Deng, Qiuwei Wu

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Abstract

This paper studies the communication time-delay issues in islanded microgrids (MGs) with the distributed secondary control architecture. Firstly, a time-delayed MG small-signal model is developed. Then, a new weight-average-prediction (WAP) controller is proposed to compensate the delayed system state. By introducing a time-delayed differential term in the proposed control law, the traditional time-delayed small-signal model is transformed into a neutral time-delayed mathematic model. Based on the developed model, the stability analysis is conducted considering both fixed time delay and time-varying delay. For the fixed time delay, a novel graphic analytical method is proposed to evaluate the time delay margin, which eliminates the conservatism compared with existing time-domain methods. For the time-varying delay, stability condition is established by a Lyapunov-Krasovskii function and linear matrix inequalities. In addition, some non-linear WAP control methods are discussed to guide the parameter tuning with a higher resolution. Lastly, the proposed method and analytical result are verified in the OPAL-RT real-time test platform. The results demonstrate the effectiveness and high performance of the proposed controller.
Original languageEnglish
JournalIEEE Transactions on Power Systems
Volume37
Issue number1
Pages (from-to)330 - 342
ISSN0885-8950
DOIs
Publication statusPublished - 2021

Keywords

  • Communication time delay
  • Delay effects
  • Delays
  • distributed control
  • Mathematical model
  • microgrid
  • Power system stability
  • Small-signal model
  • Stability criteria
  • Time division multiplexing
  • Voltage control
  • Weight-average-prediction

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