Generation Search Method in Polar Coordinates for Optimization of Economic Emission Load Dispatch

The paper investigates the performance of proposed search technique for different kinds of economic dispatch problems by searching generation pattern of committed units in polar coordinate system being projection of phasor on real axis with respect to its displacement. A slack generator is introduced to meet the demand constraint while generation pattern is searched within operating limits of generators. Economic dispatch with valve loading, economic dispatch with ramp rate and prohibited operating zones and economic-emission dispatch are explored. Economic-emission dispatch problem treats economic and emission as competing objectives and the conflict between them is resolved exploiting fuzzy satisfying method. Weight pattern assigned to participating objectives is searched as weighting technique is applied to generate the non-inferior solutions. The non-inferior solution is adjudged as the best operating point that attains maximum satisfaction level in terms of the membership function of participating objectives. Performance of the algorithm is investigated on dispatch problems of different size and complexity. The proposed optimization technique has emerged as a useful optimization tool for handling network losses, ramp rate limits and prohibited operating zone avoidance in account to determine the optimal dispatch solution as well as optimal operating point in the non-inferior domain for any number of the goals.