Journal article ยท Ahead of Print article
Distributed Weight-Average-Prediction Control and Stability Analysis for an Islanded Microgrid with Communication Time Delay
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.
Language: | English |
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Publisher: | IEEE |
Year: | 2021 |
Pages: | 330-342 |
ISSN: | 15580679 and 08858950 |
Types: | Journal article and Ahead of Print article |
DOI: | 10.1109/TPWRS.2021.3092717 |
ORCIDs: | Wu, Qiuwei , 0000-0001-6508-6499 , 0000-0002-9750-324X , 0000-0002-0503-183X and 0000-0002-6148-1034 |
Communication time delay Delay effects Delays Mathematical model Power system stability Small-signal model Stability criteria Time division multiplexing Voltage control Weight-average-prediction distributed control microgrid