Abstract
This paper presents a spatial harmonics compensation method for mutually coupled switched reluctance machines (MCSRMs) with sinusoidal current excitation. The regulation by linear controllers to achieve sinusoidal currents in MCSRMs is challenging due to the substantial presence of spatial harmonics. The standard vector control with using Proportional-Integral controllers cannot effectively suppress the spatial harmonics of the current waveform due to the bandwidth limitations. In the proposed method, the essential voltage harmonics are added to the fundamental voltage component to create sinusoidal currents. The voltage harmonics are calculated from the flux linkage harmonics where voltage and flux linkage harmonics are represented as vectors in terms of Fourier coefficients. The Fourier coefficients of the flux linkage are function of direct-and quadrature-axis currents. Hence, they are in the form of two-dimensional look-up tables (LUTs). The used LUTs in the proposed method are independent of rotor position and they are obtained from the finite element analysis (FEA) model. The proposed spatial harmonics compensation method is validated using FEA and experiments for a 3-phase 12/8 MCSRM at generating and motoring modes of operation.
Highlights
Switched reluctance machines (SRMs) have gained more interest in the past decade as a cost-effective alternative for the rare earth based machines
SIMULATION RESULTS AND finite element analysis (FEA) VALIDATION In order to have an accurate dynamic model that is very close to reality, the effect of motor saturation and spatial harmonics should be considered
Saturation and spatial harmonics are considered by describing the phase current as a function of phase flux linkage and rotor position in a 3D look-up tables (LUTs)
Summary
Switched reluctance machines (SRMs) have gained more interest in the past decade as a cost-effective alternative for the rare earth based machines. SRMs have a simple structure due to the absence of magnets and rotor windings [1]. These advantages make the SRM a strong candidate for transportation applications such as electric vehicles, hybrid electric vehicles [2], and more electric aircrafts (MEAs) [3]. CSRM are based on single phase excitation and torque production is due to the rate of change of self inductance. While MCSRMs are based on multi-phase excitation to enhance the mutual coupling between phases and torque production is due to the rate of change of self and mutual inductances. The mutual coupling effect is further increased by changing the windings configuration [1]
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