Optimization for Airgap Flux Density Waveform of Flywheel Motor Using NSGA-2 and Kriging Model Based on MaxPro Design

A novel multi‐objective optimization method for the optimization of interior permanent magnet synchronous machines

“…The magnet eddy-current loss is calculated from eddy current obtained by Equations (5) and 6, the eddy-current loss in magnet is expressed as follows:…”

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“…The MESS is operated as a motor when the generated energy is sufficient while it is also operated as a generator to reuse the stored energy. The type of electrical machines for MESS can be also various, and the previous studies applied an induction machine [16], a switched reluctance machine [17], and a permanent magnet synchronous machine (PMSM) [18] for their flywheel energy storage system. Although the PMSM shows higher energy density and superior performance, some applications still prefer the other types of machines due to the high price and the demagnetization of the rareearth materials for PMs.…”

Small-signal Analysis of DC Microgrid and Multi-objective Optimization Segmented Droop Control Suitable for Economic Dispatch

“…However, the actual system consists of multiple converters. In [29], the DC-DC gyrator model and equivalent processing of droop-control loop are used to simplify the models of various converters and establish the approximate DC microgrid model. On this basis, a nonlinear stability analysis is performed using the bifurcation theory.…”

“…The optimization objectives, including the influence of eliminating the line resistance and capacity matching, are considered in the search process. Using the elitist non-dominated sorting genetic algorithm (NS-GA-II) [29], better turning points are calculated after obtaining the newly rated operation points from the system-layer economic dispatch. The continuous droop control and controllable range of the output/input power are improved in a wider range of operations.…”