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In this paper, an enhanced power sharing strategy employing adaptive virtual impedances for Q-ω and P-V droop-based islanded microgrids (MGs) is proposed. The proposed scheme improves the performance of dynamic response and system stability while accurate power sharing is obtained. The low-bandwidth communication is utilized to send the power commands. The adaptive virtual impedances consist of a...
Microgrids consisting of distributed generators (DGs) have the ability to operate connected to the utility grid and also in stand-alone (island) mode. In both cases, frequency and voltage regulation across the microgrid must be ensured, and the DGs should share their generation equally. The transition of the microgrid between the two operating modes also needs to be seamless, which is conventionally...
In islanding microgrid, the impact of line impedance on the proportional power sharing cannot be neglected if multi-inverters are operated to form a microgrid. In this paper, an improved droop controller is proposed to reduce the unexpected dynamic and steady power sharing errors caused by the mismatching of line impedance. With this proposed combined compensation, the power quality, the dynamic and...
This paper proposes an improved power control approach to address the load sharing problems in islanded microgrids. The proposed method first estimates distributed generation (DG) unit feeder impedances through measuring low order point of common coupling (PCC) harmonic voltages and DG unit line harmonic currents. With the knowledge of feeder impedances, reactive power sharing performance can be enhanced...
Fluctuating power resulting from renewable energy sources is strictly challenging power quality in Microgrid systems. This paper presents a Distributed-STATCOM (D-STATCOM) to alleviate variation of both positive-sequence and negative-sequence voltages at the fundamental frequency. The D-STATCOM operates as separate conductances at the fundamental positive- and negative-sequence frequency, respectively,...
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