Abstract
This paper presents an improved artificial bee colony (ABC) technique for solving the dynamic economic emission dispatch (DEED) problem. Ramp rate limits, valve-point loading effects and prohibited operating zones (POZs) have been considered. The proposed technique integrates the grenade explosion method and Cauchy operator in the original ABC algorithm, to avoid random search mechanism. However, the DEED is a multi-objective optimization problem with two conflicting criteria which need to be minimized simultaneously. Thus, it is recommended to provide the best solution for the decision-makers. Shannon’s entropy-based method is used for the first time within the context of the on-line planning of generator outputs to extract the best compromise solution among the Pareto set. The robustness of the proposed technique is verified on six-unit and ten-unit system tests. Results proved that the proposed algorithm gives better optimum solutions in comparison with more than ten metaheuristic techniques.
Highlights
Emission dispatch aims at minimizing emission of harmful gases, caused by fossil-fueled thermal units, such as CO, CO2, NOx and SO2 [1,2]
The dynamic economic emission dispatch (DEED) problem is considered as a dynamic optimization problem having the same objectives as the economic emission dispatch (EED) over a timeperiod of one day, subdivided into definite time intervals of one hour with respect to the constraints imposed by the generator ramp-rate limits (RRL) [3]
The quality of its optimal solution is influenced by the operating constraints, such as valve-point loading effects, prohibited operating zones and ramp rate limits (RRLs)
Summary
Emission dispatch aims at minimizing emission of harmful gases, caused by fossil-fueled thermal units, such as CO, CO2, NOx and SO2 [1,2]. Due to the dynamic nature of today’s network loads, it is required to schedule the thermal unit outputs in real time according to the variation of power demands during a certain time period [3]. To solve this modified EED problem, known as dynamic economic emission dispatch (DEED), several mathematical formulations have been suggested [3,4,5,6]. The operational decision at an hour may be influenced by the one taken at a previous hour Other constraints such as prohibited operating zones (POZ) and valve-point loading effects (VPLE) have been considered [7,8]. The DEED becomes a highly nonlinear problem with non-convex and discontinuous fitness functions
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