Analysis of Optimal Reconfiguration of Shipboard Power Systems

Abstract

Abstract-In power system reconfiguration, the status (ON/OFF) of switches are optimized such that maximum power is delivered to loads after the occurrence of a fault. The optimized reconfiguration is achieved by prioritizing power delivered to vital loads over semi-vital and nonvital loads. The formulation presented in this paper considers a new balanced hybrid (AC and DC) shipboard power system (SPS). Analysis of the nonconvex reconfiguration formulation is done by an appropriate nonconvex solver and by convex approximation. Unlike the nonconvex solution that is based on branch-and-bound methods, convex approximation significantly reduces complexity. It is shown that for the hybrid SPS reconfiguration problem, low complexity convex approximations are effective in finding optimal solutions. Cumulative distribution function (CDF) of the power delivered to loads is presented to showcase the system robustness against random fault scenarios. A combined objective of maximizing power delivery and minimizing the number of switching actions is included in the analysis. Tradeoff between power delivered and number of switching operations after reconfiguration has been discussed at steady state. A separate analysis is also included to observe the intermediate dynamic switch states while the reconfiguration is in progress to capture the tradeoff more prominently.

A Novel Multi-Objective Discrete Particle Swarm Optimization with Elitist Perturbation for Reconfiguration of Ship Power System

“…Therefore, in the reconfiguration solution 1, after the closure of CB5, the load L2 is also cut off to ensure the power supply for the SPS. Solution 1 holds the least operation costs of function 2 f , but the largest load loss of function 1 f . Solution 5 holds the least loads loss of function 1 f , but the operation cost is the largest in all the solutions at the same time, because it need to cut off 6 loads of grade 3 in priority, including L6,L7and the others.…”

“…The generation capacity and ship scale keep enlarging in space with the application of high power density integrated generating system, DC medium voltage transmission, zonal distribution system, power conversion device, and the high power electric propulsion system, which makes it more and more difficult to reconfigure the SPS effectively [2].…”

An Overview of Power Electronics Techniques in Electric Systems for Transport Applications

“…While the large size of SST is a problem, and synchronous generators have to be applied, and the reactive compensation has to be taken into consideration. On the other hand, the mediumvoltage DC (MVDC) power system [51][52][53][54]emerges which can make the generators paralleled even if an asynchronous case is encountered. In addition, the elimination of the gearbox between the prime motor and generator is realized thanks to the merit that no frequency limitation is presented for the generators.…”

Research on the Application of WPT-EEMD Method in the Fault Diagnosis of AESPS

“…This chain brings a significant revolution to the ship power system [1]. In this kind of power system, the load capacity of propulsion motor is greater than the unit capacity of the generator, which is a large power disturbance, causing AESPS failure easily or even collapse with disastrous consequences [2]. To ensure the safe operation of ship power system, it is necessary to study the failure and unstable operation factors, while the key is to obtain the effective fault information.…”