Preprint Article Version 1 This version is not peer-reviewed

A Generalized and Mode-adaptive Approach to the Power Flow Analysis of the Isolated Hybrid AC/DC Microgrids

Version 1 : Received: 5 May 2019 / Approved: 6 May 2019 / Online: 6 May 2019 (12:41:22 CEST)

A peer-reviewed article of this Preprint also exists.

Xiao, Y.; Ren, C.; Han, X.; Wang, P. A Generalized and Mode-Adaptive Approach to the Power Flow Analysis of the Isolated Hybrid AC/DC Microgrids. Energies 2019, 12, 2253. Xiao, Y.; Ren, C.; Han, X.; Wang, P. A Generalized and Mode-Adaptive Approach to the Power Flow Analysis of the Isolated Hybrid AC/DC Microgrids. Energies 2019, 12, 2253.

Journal reference: Energies 2019, 12, 2253
DOI: 10.3390/en12122253

Abstract

HybridAC/DC microgrids(HMG) are emerging as an attracting method for integrating the AC/DC distributed energy resources(DERs) with the features of high-performance and low-cost. In the isolated hybrid AC/DC microgrid (IHMG), the key problem is how to balance the power variation and regulate the voltage and frequency. Various energy storage systems (ESS)and interlinking converter (IC) technologies are viable for this application. The present study proposes a novel unified power flow model to evaluate and compare the abilities of the ESS with different connection topologies and ICs with different control approaches to maintain the voltage and frequency stability of the IHMG. In order to investigate the performance of the proposed scheme, five operation modes of the IHMG are defined and explained. The classification is based on the connection topologies and control modes of the ESS/IC in the IHMG. Then, a set of generic PF equations are derived. Moreover, three binary matrices are applied in the construction of the unified power equations. These matrices are used for describing the running state of the IHMG. Finally, in order to verify the proposed scheme, it is applied to several case studies of the IHMG. The operation characteristics of multi-DC subgrids IHMG in different modes, particularly when an external disturbance occurs, are investigated.

Subject Areas

hierarchical control; AC-DC hybrid microgrids; primary control; ESS; interlinking converter; power flow analysis

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