PROJECT TITLE :

An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance

ABSTRACT:

This paper proposes an improved distributed secondary management theme for dc microgrids (MGs), aiming at overcoming the drawbacks of standard droop management technique. The proposed secondary management scheme can take away the dc voltage deviation and improve this sharing accuracy by using voltage-shifting and slope-adjusting approaches simultaneously. Meanwhile, the average worth of droop coefficients is calculated, and then it's controlled by an extra controller included in the distributed secondary control layer to ensure that every droop coefficient converges at a cheap worth. Hence, by adjusting the droop coefficient, each participating converter has equal output impedance, and therefore the accurate proportional load current sharing will be achieved with totally different line resistances. Furthermore, this sharing performance in steady and transient states can be enhanced by using the proposed technique. The effectiveness of the proposed technique is verified by detailed experimental tests based mostly on a three × one kW prototype with 3 interface converters.