Optimal Modeled Six-Phase Space Vector Pulse Width Modulation Method for Stator Voltage Harmonic Suppression

Abstract

Dual Y shift 30 • six-phase motors are expected to be extensively applied in high-power yet energy-effective fields, and a harmonic-suppressing control strategy plays a vital role in extending their prominent features of low losses and ultra-quiet operation. Aiming at the suppression of harmonic voltages, this paper proposes a six-phase space vector pulse width modulation method based on an optimization model, namely OM-SVPWM. First, four adjacent large vectors are employed in each of 12 sectors on a fundamental sub-plane. Second, the optimization model is constructed to intelligently determine activation durations of the four vectors, where its objective function aims to minimize the synthesis result on a harmonic sub-plane, and its constraint condition is that the synthesis result on the fundamental sub-plane satisfies a reference vector. Finally, to meet the real-time requirement, optimum solutions are obtained by using general central path following algorithm (GCPFA). Simulation and experiment results prove that, the OM-SVPWM performs around 37% better than a state-of-the-art competitive SVPWM in terms of harmonics suppression, which promise the proposed OM-SVPWM conforms to the energy-effective direction in actual engineering applications.Energies 2018, 11, 2598 2 of 16 As a prominent MMDS, dual Y shift 30 • six-phase motor (DYSM) has gained widespread attention and representative application in high-power yet energy-effective fields, such as electric locomotive traction, ship electric propulsion, wind power generation, etc. [4][5][6]. The stator of a DYSM has an irregular but delicate structure. As shown in Figure 1, the asymmetric six-phase windings of a DYSM are constructed with two sets of three-phase windings, which are arranged with a 30 • spatial electrical angle displacement. This special structure brings the following three typical advantages:(1) With the asymmetric six-phase winding, lower-order harmonic components of the magnetic motive force can be effectively eliminated; (2) With double the number of winding phases, higher power can be transmitted on the same voltage or current level; (3) Continuous operating of DYSMs under phase-deficient conditions is possible. These advantages are highly beneficial to green power and sustainable energy-saving.

A Low Common-Mode SVPWM for Two-Level Three-Phase Voltage Source Inverters

“…However, there are common-mode voltages (CMVs) generated by the use of SVPWM in the inverters [3]. In inverter-load systems, such as inverter-motor systems, CMVs would exacerbate negative effects such as leakage current, cable and winding insulation degradation, bearing voltage, and electromagnetic interference [4,5]. With the development of high-frequency and integrated systems, these negative effects cannot be ignored, thus requiring CMV suppression in high-performance applications [6,7].…”

A Wind Energy Conversion System Based on a Generator with Modulated Magnetic Flux

“…The multiphase machines have become relevant for high power applications because of inherent advantages like redundancy, reliability, and relatively low DC-link voltage requirement. Taking into account the attributes (properties) of the multiphase machines, sophisticated control methods of these are often implemented [24,25]. The energy conversion system proposed in this work uses some of these properties.…”

Vector Weighting Approach and Vector Space Decoupling Transform in a Novel SVPWM Algorithm for Six‐Phase Voltage Source Inverter

“…Compared with the pulse width modulation (PWM) control algorithm for conventional three-phase motors, the PWM method for six-phase motors is more flexible [1][2][3][4][5][6]. At present, carrier-type PWM algorithm, permanent-magnet synchronous motor SVPWM algorithm, and current hysteresis PWM algorithm are three of the PWM algorithms that are commonly used for multiphase two-level voltage source inverter (VSI) [7,8].…”