Universal active power control converter for DC-Microgrids with common energy storage

Vuyyuru, Umamaheswararao, Maiti, Suman, Chakraborty, Chandan and Batzelis, Efstratios I. (2021) Universal active power control converter for DC-Microgrids with common energy storage. IEEE Open Journal of Industry Applications, 21-35. (doi:10.1109/OJIA.2021.3063625).

Abstract

This paper presents a battery integrated Power Flow Controller (PFC) which is found effective for the interconnection of several dc microgrids. The configuration offers delicate control over load-flow and also provides a way for the integration of Common Energy Storage (CES) to the adjacent grids. The CES is more effective when both the grids have surplus or deficit of power compared to their individual storage capacity (if any). In this paper, a Universal Active Power Control Converter (UAPCC) is proposed (which is basically a three-port converter), where port-1 is connected in parallel with the line, port-2 is connected in series with the line, and port-3 is connected to the CES through a bidirectional dc-dc converter. Relevant control algorithms have been developed for the operation of such system satisfying various system requirements that are inevitable for the interconnection of dc microgrids. The proposed control methods allow decoupled operation of three ports to control power flow between dc grids and CES independently. The complete system along with control methods are initially verified through computer simulation using MATLAB/SIMULINK. Thereafter, a prototype is developed in the laboratory at 380 V level to experimentally validate the concept. The results show effectiveness of the UAPCC for interconnection of dc microgrids with CES.

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Contributors

Author: Efstratios I. Batzelis

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