TechRxiv
cbconf15-06720381.pdf (621.86 kB)

Decentralized Voltage Balancing and Power Sharing in Islanded Bipolar DC Microgrids

Download (621.86 kB)
preprint
posted on 30.07.2020 by Saman Dadjo Tavakoli
This paper presents a decentralized control scheme for voltage balancing and power sharing in bipolar dc
microgrids. This relies on utilizing a converter topology which offers three levels of output voltage availability with the key features of boosting the input voltage and balancing the output voltages. This converter makes it possible to further improve the structure of bipolar dc microgrids as it does not require a central voltage balancer. Small-signal analysis is done and system transfer functions are derived. Based on the RGA concept the highly coupled input-output pairs are found which helps with replacing the MIMO control system of the converter by two SISO systems. The appropriate voltage and current controllers are designed based on SISO principles. Moreover, a double droop control method is proposed which fulfills the simultaneous power sharing and voltage regulation of DG units in the host microgrid. The effectiveness of the proposed control strategy is demonstrated through simulation studies conducted on an
islanded bipolar dc microgrid involving unbalanced loads, while the voltage balancing of the bipolar dc microgrid and the power sharing accuracy are evaluated.

History

Email Address of Submitting Author

samandadjo@gmail.com

Submitting Author's Institution

Shahid Beheshti University

Submitting Author's Country

Iran

Licence

Exports

Licence

Exports