A Comprehensive Load Flow Approach for Grid-Connected and Islanded AC Microgrids
- 12:45PM Nov 16, 2020
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Evangelos E. Pompodakis, Georgios C. Kryonidis, Minas C. Alexiadis: ‘A Comprehensive Load Flow Approach for Grid-Connected and Islanded AC Microgrids’ in IEEE Transactions on Power Systems, vol. 35, no. 2, pp. 1143-1155, 2020
This paper proposes a comprehensive load flow algorithm for balanced and unbalanced distribution systems considering the effect of a multi-grounded neutral conductor. The method is based on the implicit Z BUS method presenting fast convergence and robustness regardless of the R/X ratio of the lines. Its distinct feature is its ability to handle all network configurations, including highly meshed distribution systems that operate in either islanded or grid-connected mode. Furthermore, an algorithm is proposed for overcoming the limitation of implicit Z BUS method to treat PV nodes. Additionally, the concept of virtual impedance is incorporated into the proposed algorithm to accurately simulate the behavior of distributed generators (DGs) during the islanded operation. Numerical simulations are conducted in 33-Bus and 38-Bus balanced networks as well as in 25-Bus and 30-Bus unbalanced networks to verify the validity of the proposed load flow algorithm.
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