Consensus-Based Autonomous Microgrid Secondary Frequency Control with Communication Impairments
DOI:
https://doi.org/10.51846/vol8iss1pp21-31Keywords:
Consensus, Microgrid, Noise, Delay, Link Failure, Frequency ControlAbstract
The frequency stability requirement of islanded microgrids is dependent on the control of electronic inverters; therefore, it is necessary to use proper control methods to improve the robustness of the microgrid system in the presence of impairments. While primary droop-based control methods can keep the frequency deviation within allowable limits, they are weak in synchronizing frequencies of distributed generators to the reference value. In this work, a consensus-based approach is employed for secondary frequency control in autonomous microgrids to ensure frequency synchronization among the distributed generators (DGs) and to mitigate deviation in frequency of operation. In the approach, the model of the microgrid system was used to develop a consensus-based secondary control scheme, and tracked errors in frequency and local active power with information received over impairment-corrupted communication links among the DG units were considered. The performance of the proposed method was evaluated using a simulation of a four-DG microgrid test system implemented in MATLAB/SimPowerSystem software environment. The simulation considered load perturbation among the DGs, communication noise, link failure, and link time delay. The results from the simulation showed that the method achieves frequency synchronization with load perturbations despite the presence of communication impairments within the communication links of the DGs.
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