Unbalanced Current Reduction Method of Microgrid Based on Power Conversion System Operation

Hyun Shin, Sang Heon Chae and Eel-Hwan Kim
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Hyun Shin: Faculty of Applied Energy System, Jeju National University, Jeju 63243, Korea
Sang Heon Chae: Electric Energy Research Center, Jeju National University, Jeju 63243, Korea
Eel-Hwan Kim: Department of Electrical Engineering, Jeju National University, Jeju 63243, Korea

Energies, 2021, vol. 14, issue 13, 1-16

Abstract: In isolated areas such as islands with small power grids, the BESS (Battery energy storage system) can supply the standard voltage and frequency to the power system to achieve 100% of renewable sharing. In addition, the installation of additional BESS may be required in the microgrid due to technical limitations such as redundant operation and manufacturer specifications. Thus, the BESSs in a microgrid can be split into main and sub BESSs which play a role as the main source and auxiliary services, respectively. Generally, the ratio of unbalance current in microgrid system tends to be high, because of inherently unbalanced single phase load distribution. However, because the capacity of BESS is calculated under balanced conditions, the PCS (Power conversion system) of BESS may stop protecting its switching device from a single phase overcurrent in actual operation. From this perspective, this paper proposes that the sub BESSs perform dual current control to supply the unbalanced current instead of the main BESS. In the simulation result of the proposed method, the current unbalance rate of the main ESS has been reduced by about 26%. Through the proposed control scheme, it is possible to prevent an unexpected single phase overload of the main BESS in the microgrid.

Keywords: dual current control; ESS; microgrid; PSCAD/EMTDC; redundancy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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