期刊
IEEE TRANSACTIONS ON ENERGY CONVERSION
卷 34, 期 4, 页码 2235-2247出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2019.2935501
关键词
Delays; Microgrids; Voltage control; Stability analysis; Markov processes; Frequency control; Distributed cooperative secondary control; Markov time-varying network-induced delays; small-signal model-based information Kalman observer; global closed-loop stochastic system; global stability theorem
资金
- National Natural Science Foundation of China [51877060]
- Fundamental Research Funds for the Central Universities of China [PA2019GDQT0006]
- Science and Technology Project of State Grid (Research and application of key technologies for operation and maintenance of smart substation based on the fusion of heterogeneous network and data)
The network-induced delays have a great impact on microgrid performance and stability. In this paper, we proposed a distributed cooperative secondary control with stochastic Markov time-varying network-induced delays, by which both output voltage/frequency restoration and active power sharing can be obtained. A new small-signal model of the microgrid control system is developed, and a small-signal model-based information Kalman observer is introduced to acquire the estimated state vector. Then, the global closed-loop stochastic system accommodated by the Markov time-varying network-induced delays of the microgrid is derived, and the corresponding global stability theorem is introduced. Finally, the simulation of a microgrid test system is presented to verify the control performance. The results show that our approach has accurate regulations on voltage/frequency restoration and active power sharing in terms of load variations, plug-and-play capability, and network-induced delays. In addition, the control gain parameters and network-induced delays effects on the microgrid secondary control are also verified.
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