Multi-objective Power Optimization of Microgrid with Distributed Generation

This paper deals with the optimal energy management approach by using multi-objective optimization algorithm for two modes of micro grid operation: non-autonomous and autonomous which includes the optimally allocated and sized Distributed Generation (DG) units working at optimal power factor. For micro grid operation, objectives are optimization of DGs sizes with loss minimization and voltage profile improvement. A multi objective optimization algorithm is proposed to achieve the targets. Voltage stability indices based priority list has developed to optimally allocate the DGs. After siting DGs, optimal sizing has been executed in terms of loss minimization for both modes of micro grid. Numerical experimentations have been carried out on DGs penetration levels increasing gradually from 0% to 100% The proposed methodology is programmed under MATLAB software and it is tested for standard IEEE-15 bus and IEEE-33 bus radial distribution systems. 33-bus radial system with 100% of penetration level of DGs has been converted into autonomous micro grid for verification of the suggested algorithm. Reduction in losses and improvement in voltage profile proves the effectiveness of the proposed method.