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Faculty & Staff Scholarship
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Lane Department of Computer Science and Electrical Engineering
This paper proposes a novel cooperative secondary control strategy for microgrids which is fully distributed. There is a two-layered coordination, which exists between inverter based DGs of both types, i.e. Voltage Source Inverter (VSI) and Current Source Inverter (CSI), also called PQ inverter. In first layer of the proposed two-layered cooperative control strategy, VSIs will take care of the primary average voltage regulation by implementing the average consensus algorithm (ACA); then in the second layer of control, the PQ inverters will improve the voltage quality of the microgrid while maintaining the average voltage of buses at the same desired level. Zone dedication algorithm is utilized in the second layer for voltage quality purposes based on sensitivity analysis. The sensitivity analysis is based on Simplified Jacobian matrix and the result of that is used to define the zone related to each DG in the microgrid. The goal of this zone dedication is to assign loads to the DGs that can compensate their changes with less effort (generating less power) than the others. There are two major contributions in this paper; 1- PQ inverters are effectively involved to increase microgrids capacity for better power management by introducing sensitivity to the PQ inverters set-point. This is defined based on the structure of the microgrid and takes into account the location of load changes. 2- The proposed strategy not only focuses on transient response but also improves the steady state response which smooths the voltage profile of the system while keeping the average voltage at the same desired level. The algorithm has been applied to a 13 bus system with a fully distributed communication in which each VSI inverter only communicates with its immediate neighbors and each PQ inverter is only in touch with associated bordering agents. The conclusive results verify that the proposed control strategy is an effective way to control the microgrid's voltage to have a smoother and stable voltage profile. The analysis also confirms the robustness of the proposed cooperative control in presence of possible time delays.
Digital Commons Citation
Mohammadi, F. Doost; Keshtkar, H.; Banadaki, A. Dehghan; and Feliachi, A., 'A Novel Cooperative Distributed Secondary Controller for VSI and PQ Inverters of AC Microgrids' (2019). Faculty & Staff Scholarship. 2046.
Doost Mohammadi, F., Keshtkar, H., Dehghan Banadaki, A., & Feliachi, A. (2019). A novel cooperative distributed secondary controller for VSI and PQ inverters of AC microgrids. Heliyon, 5(6), e01823. https://doi.org/10.1016/j.heliyon.2019.e01823
Computer Sciences Commons, Electrical and Computer Engineering Commons
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