International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 269 Optimal Shipboard Power Management by Classical and Differential Evolution Methods B.Manasa 1 , K.Vaisakh 2 1 B.Manasa, M.Tech Student, Department of Electrical Engineering, Andhra University College of Engineering 2 K.Vaisakh, Professor, Department of Electrical Engineering, Andhra University College of Engineering, Visakhapatnam, Andhra Pradesh, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - From past few years, optimal electrification of inaccessible offshore systems has become important and received extensive attention from maritime industry. Total electrification of the shipboard power systems known as all- electric ships (AESs) is subjected to introduction of electric propulsion has led to the need for more cost effective solution. With the increasing nature of energy demand in modern ships whether with the growing needs for good energy conservations and environmental protection have intended to pursue AES (All-Electric Ship) configurations. AES is envisioned to become an interesting technology with great potential for both emission and fuel reductions when it is compared with conventional ship power systems. But such on-board systems are inclined to sudden load variations due to fluctuating mission profile as well as weather conditions, thus they have need for effective PMSs (Power Management Systems) to operate optimally under different working environments. Here in this paper, coordinated optimal power management at the supply side of a given All-Electric Ship is studied. This paper proposes a Differential Evolution Algorithm, for Shipboard Power Management. To show the usefulness of the proposed Power Management Systems (PMS), the results are compared with Classical method. Key Words: All-electric ship; constrained optimization; co-ordinated energy management; Power management system. 1. INTRODUCTION A ship board electrical system is small in size and has fewer components than a typical commercial power system. A classic combatant ship may have 3 or 4 generators with collective capacity of 80-100 MW. Utmost of this capacity is utilized by propulsion motors, for which a two shaft ship will be rated with the range of 35-40 MW each. These loads are large with respect to the total generating capacity has made the analysis of on-board ship power systems more problematic than commercial power systems. Most of the simplifying assumptions made in the analysis of the commercial power systems are invalid with that of present day ship power systems. This complication requires a detailed model of entire systems including the relevant dynamics of each component. A reliable supply of electrical power is very essential in these days. With the increasing needs for improved energy conservation, the initiative to pursue an AES (all-electric ship) configuration has emerged [1]. All Electric Ship configuration is expected to change the current ways of power generation, distribution and consumption for the on board energy sub systems and to create a exemplar shift in the processes of control, monitoring and conserving energy through utilizing power for meeting the demand that is propulsion and service loads. Moreover, AES is envisioned to become an interesting technology with a great potential for both emission and fuel reductions in comparison with the typical conventional on-board ship power systems. In an All Electric Ship, the electrical motor driven systems can be substituted with the main diesel propulsion while the required power is provided by various sources such as steam or diesel engines, energy storage systems (ESS), gas turbines (GTs), fuel fells (FCs) and possibly renewable – based prime movers such as PVs (photo voltaic systems), allowing a high efficiency throughout the entire range of operation with respect to vessel speed. The main challenge with All Electric Ships (AES) is to design and incorporate a PMS (power management system) for optimal scheduling of the on-board isolated ship power plants [3]. Well planned operations of a ship board electrical systems at the supply side (in terms of optimal generator loading), together with the efficient scheduling to meet the loads, in particular electrical propulsion demand, can affect the overall systems efficiency and ensure economic, environmental benefits. PMS can co-ordinate controllable power sources and the loads in a way to meet systems dynamic requirements for short-run intervals. Power Management Systems can be built on basis of economic dispatch and unit commitment traditional economic load dispatch deals with minimizing power generation cost while satisfying set of equality and inequality constraints. On the other hand, some toxic gasses are emitted polluting environment due to operation of the fossil fuel plants. Thus conventional minimum operation cost cannot be made on the mere basis for generation dispatch, emission minimization to protect environment must also be taken care of. Many algorithms have been proposed to solve power management problem in shipboard power system.