Abstract
Recently, the control of multiphase electric drives has been a hot research topic due to the advantages of multiphase machines, namely the reduced phase ratings, improved fault tolerance and lesser torque harmonics. Finite control set model predictive control (FCS-MPC) is one of the most promising high performance control strategies due to its good dynamic behaviour and flexibility in the definition of control objectives. Although several FCS-MPC strategies have already been proposed for multiphase drives, a comparative study that assembles all these strategies in a single reference is still missing. Hence, this paper aims to provide an overview and a critical comparison of all available FCS-MPC techniques for electric drives based on six-phase machines, focusing mainly on predictive current control (PCC) and predictive torque control (PTC) strategies. The performance of an asymmetrical six-phase permanent magnet synchronous machine is compared side-by-side for a total of thirteen PCC and five PTC strategies, with the aid of simulation and experimental results. Finally, in order to determine the best and the worst performing control strategies, each strategy is evaluated according to distinct features, such as ease of implementation, minimization of current harmonics, tuning requirements, computational burden, among others.
Highlights
Rotating electrical machines with a number of phases higher than three (n > 3) are commonly referred to in the literature as multiphase machines [1]
In order to assess and compare the performance of the different Finite control set model predictive control (FCS-Model predictive control (MPC)) strategies described in the previous section, several simulations results obtained with a six-phase permanent magnet synchronous machines (PMSMs) drive are presented
The 2L-voltage source inverters (VSIs) were modelled in Matlab/Simulink using the ideal insulated gate bipolar transistor (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 { Ps, Us, Is, nn, tn, ψsn } are the rated values of the power, voltage, current, speed, torque and stator flux of the machine designed in Reference [76]
Summary
Rotating electrical machines with a number of phases higher than three (n > 3) are commonly referred to in the literature as multiphase machines [1]. The increase in the number of phases leads to a lower current or voltage per phase, decreasing the requirements of the power semiconductors ratings [4]. The VSD transformation is widely used nowadays in FCS-MPC and in FOC and DTC strategies [50,58] since it is able to separate the current, flux linkage and voltage components responsible for the electromechanical energy conversion, mapped into the α-β subspace, from the remaining components, mapped into the x-y subspace, which can be used as additional degrees of freedom [7]. The VSD transformation maps the current, flux and voltage harmonics of order h = 12m ± 1 with m = 1, 2, ...
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