Frequency-angle droop control strategy based on decentralized control procedure for Islanded micro-grid basis of the load unbalanced and non-linear characteristics

Because of the nature of renewable energies and their connectivity with power electronics mediators to the main grid, there would be unavoidable controlling challenges for their usage. Sometimes, in terms of micro-grid protecting condition, it is being isolated from the main grid connection point and then has become insular. Priority in these conditions would be maintaining the reliability and generating micro-grid for final customers. This issue is introduced with the name of power management system in IMGs. Main challenge of the operation of DG with local load, in the case of connection to the network and also in insular case is that this DG must be equipped to a VSC with controlling machine, so it could meet the following conditions: 1) maintaining the micro-grid bass voltage and frequency, 2) supplying preset load regardless of system parameters and 3) control thought feedback from local load. Controlling method despite its disadvantages had already been used. Droop control is P/F and Q/V. Droop control could be accessible according to two centralized (transmission link) and decentralized procedure (without any communication link). In this paper, a new advantaged control based on droop control method in a decentralized form is presented for a micro-grid insular for controlling power and regulating micro-grid voltage on the basis of the load of nonlinear and unbalanced characteristics. At the end, to confirm proper functioning of the control system MATLAB/SIMULINK application has been used, then the suggested plan is being simulated and then results are being.

Keywords:

: Decentralized droop control , Islanded micro-grid , angle- frequency droop control , unbalanced and non-linear characteristics