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A novel power calculation method for droop-control microgrid systems

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6 Author(s)
Andrade, E.T. ; Electr. Eng. Dept., Fed. Univ. of Mato Grosso do Sul, Campo Grande, Brazil ; Ribeiro, P.E.M.J. ; Pereira Pinto, J.O. ; Chen, Chien-Liang
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In this paper a new methodology is presented to calculate the average power quickly and accurately for the single-phase paralleled inverters intended to be applied in a droop-control microgrid system. Most existing droop control systems utilize a simple first-order filter to calculate the active and reactive power. The added filter can smooth the calculated results but it tends to hurt the system dynamic response due to a low cut-off frequency that is intended to get enough ripple attenuation. This low frequency pole in the low-pass filter could also introduce system instability under certain load conditions. A new filter calculation methodology is thus proposed to achieve better ripple attenuation with faster response by combining a low-pass filter, a delay, and summation blocks. Both simulation and experiment are used to verify the effectiveness of the proposed power calculation methodology.

Published in:

Applied Power Electronics Conference and Exposition (APEC), 2012 Twenty-Seventh Annual IEEE

Date of Conference:

5-9 Feb. 2012