Technical Session 4:

Title:           DC-Bus Voltage Regulation and Power Compensation with Bi-directional Inverter in DC-Micro Grid Applications
Authors:       M. Rajendar Reddy, J. Bhagwan Reddy, K. Ramulu
Abstract:   This paper presents a single-phase bi-directional inverter with dc-bus voltage regulation and power compensation in dc-microgrid applications. In dc-microgrid applications, a power distribution system requires a bi-directional inverter to control the power flow between dc bus and ac grid, and to regulate the dc bus to a certain range of voltages, in which dc load may change abruptly. This will result in high dc-bus voltage variation. In this paper, we take into account this variation and propose an on-line regulation mechanism according to the inductor current levels to balance power flow and enhance the dynamic performance. Additionally, for power compensation and islanding protection, the bi- directional inverter can shift its current commands according to the specified power factor at ac grid side. Simulated and Experimental results obtained from a 5-kW single-phase bi-directional inverter have verified the analysis and discussion.

Keywords:  Bi-directional Inverter, DC-Bus, DC-Micro grid Applications.
Pages:        113-121

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