A voltage ripple suppression method of DC microgrid under unbalanced load

Xiao-hong, Zhu; Zhang, Yumeng; Yang, Jin Jin

doi:10.1109/icems.2017.8056150

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Foad Najafi et al used a zero-sequence and negative-sequence virtual impedance controller to improve sharing of unbalanced currents in islanded microgrids [12]. Xiaorong Zhu et al studied a control strategy of DC bus voltage ripple suppression using super capacitors in consideration of the unbalanced load condition [13]. Mohammad Jafar Hadidian Moghaddam et al proposed an improved control scheme for a 4-leg battery energy storage system under unbalanced and nonlinear load conditions operating in microgrids [14].…”

Section: Introductionmentioning

confidence: 99%

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

2021

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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.

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Section: Introductionmentioning

confidence: 99%