Energy Internet and We-Energy by Qiuye Sun

Author:Qiuye Sun
Language: eng
Format: epub, pdf
ISBN: 9789811305238
Publisher: Springer Singapore

5.4.1 Circulating Current Analysis

Through the circulating current analysis between DGs, the circulating current between two parallel connected DG is divided into active circulating and reactive circulating current as

(5.4)

(5.5)

(5.6)

where is the active circulating current, is the reactive circulating current, is the total circulating current, is output voltage of the first DG, is output voltage of the second DG, , are line parameters between two DGs, is the load between two DGs, , , .

From Eqs. (5.5) and (5.6), it can be found that active and reactive circulating currents cannot be effectively eliminated only by controlling the amplitudes or phase angles of the output voltages. Thus the and droops are used to control output voltages amplitudes and angles. In order to mimic the behavior of a synchronous generator, the droop control represents the linear relationships between active power and angle of output voltage and the droop control represents the linear relationships between reactive power and amplitude of output voltage.

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