Design of a six‐phase asymmetrical permanent magnet synchronous generator for wind energy applications

Finite Control Set Model Predictive Control of Six-Phase Asymmetrical Machines—An Overview

“…In order to assess and compare the performance of the different FCS-MPC strategies described in the previous section, several simulations results obtained with a six-phase PMSM drive are presented in this section. The 2L-VSIs were modelled in Matlab/Simulink using the ideal IGBT model from the Simscape Power Systems library and the six-phase PMSM was modeled using (6)- (11) with the parameters given in Table 1, where {P s , U s , I s , n n , t n , ψ sn } are the rated values of the power, voltage, current, speed, torque and stator flux of the machine designed in Reference [76]. Since both the non-linearities of the power converters and the back-EMF harmonics contribute to the appearance of considerable x -y currents, the simulation model considers a deadtime of t d = 2.2 µs in the power switches of the 2L-VSIs and also accounts for the 5 th and 7 th harmonics of the no-load flux linkage due to the PMs, whose amplitudes {ψ s,PM5 , ψ s,PM7 } and phases {φ 5 , φ 7 } are provided in Table 1.…”

“…Regarding the configuration of the stator windings of six-phase machines, the asymmetrical configuration is the most reported in the literature, where the two sets of three-phase windings are displaced by thirty electrical degrees (α = 30 • ), as shown in Figure 1b [58]. The asymmetrical configuration provides a reduction of the MMF harmonic content and eliminates the torque harmonics of order h = 6 • m, with m being an odd number [37,75,76]. Other values for the displacement between the two sets of windings, such as α = 0 • and α = 60 • (symmetrical configuration), do not provide a reduction of the harmonic content of the MMF and torque [25,76,77].…”

“…The asymmetrical configuration provides a reduction of the MMF harmonic content and eliminates the torque harmonics of order h = 6 • m, with m being an odd number [37,75,76]. Other values for the displacement between the two sets of windings, such as α = 0 • and α = 60 • (symmetrical configuration), do not provide a reduction of the harmonic content of the MMF and torque [25,76,77]. Since in six-phase machines the two sets of windings are typically wye-connected, three neutral configurations are possible: (i) 2N; (ii) single isolated neutral (1N); and (iii) single neutral connected to the middle point of the dc-link bus or to an extra leg of the VSI, being termed as single non-isolated neutral (1NIN) in this paper [62].…”

“…Assuming sinusoidally distributed windings, negligible saturation and symmetry between the different phases, the dynamic model of a six-phase PMSM in the rotor reference frame (rotating at ω r ) obtained with the VSD transformation and rotation matrix (5) is defined by [58,76]:…”

Design and Simulation of Permanent Magnet Synchronous Generators for Small Scale Wind Power Plants

“…The advantages are not too noisy, high efficiency and have a long service life. Various designs of permanent-magnet synchronous wind generators have been carried out [1][2][3][4][5][6][7][8]. In addition, researchers also have done a lot of control and converter to obtain results that can be utilized in renewable energy power generation applications [9][10][11][12].…”