Novel space vector PWM technology with lower common‐mode voltage for dual three‐phase PMSM

Abstract

Pulse width modulation (PWM) converters generate switching common-mode voltages (CMV) across the load terminals. These voltages cause common mode currents, leading to bearing failure in motor loads and electromagnetic interference problems. This study proposes a novel space vector PWM strategy to reduce the CMV in the dual three-phase permanent magnet synchronous motor (PMSM) driven by two-level six-phase inverter. The novel space vector PWM algorithm discards the use of zero vectors. Firstly, the two largest voltage vectors of each sector are selected as main vectors to synthesise reference vector. Then, three groups voltage vector, which are opposite to the main vectors, have been selected as auxiliary vectors. Appropriate auxiliary vector selected is based on the length of zero voltage vector working time. Next, zero vector working time is distributed to the main and selected auxiliary vectors based on voltage-second principle. In addition, CMV and the harmonic component in z1z2 subspace of the proposed space vector PWM are analysed in detail. Finally, the expected CMV reduction to one-sixth of DC voltage and change rate of CMV in each cycle promised by the proposed novel space vector PWM are demonstrated with simulation and experimental results.

Opposite Triangle Carrier with SVPWM for Common-Mode Voltage Reduction in Dual Three Phase Motor Drives

“…In three-phase multi-level inverter systems such as three-level NPC inverter [19], five-level ANPC inverter [20], and MMC system [21], CMV elimination methods were accomplished by using only the voltage vectors that do not generate CMV. Several studies have been conducted to reduce or remove CMV in multiphase two-level inverter systems [7,8,[22][23][24][25][26]. The papers in [7,8,26] proposed an algorithm to reduce or remove CMV by using PWM method in dual three phase motor.…”

“…Several studies have been conducted to reduce or remove CMV in multiphase two-level inverter systems [7,8,[22][23][24][25][26]. The papers in [7,8,26] proposed an algorithm to reduce or remove CMV by using PWM method in dual three phase motor. The authors in [7] analyzed the characteristics of the CMV according to the carrier method in the dual three phase motor and reduced the change frequency of CMV using sawtooth carrier.…”

“…In [8], CMV is eliminated by shifting the PWM signals within the cycle of the switching frequency. In [26], CMV is reduced without using zero voltage vector. However, the voltage utilization in [7,8] was low because the algorithm of these papers is based on sinusoidal PWM (SPWM) [27].…”

A space vectorPWMscheme for anopen‐endwinding induction motor drive with a reduced power loss

“…In the research work presented in References 18,19 a decoupled‐SVPWM based strategies for the OWIM configuration is proposed, in which both inverters are switched simultaneously, resulting in the shifting of the harmonic spectrum to double the switching frequency. Furthermore, these SVPWM strategies are extended to the 5‐phase OWIM and the OWPMSM drive configurations as well 20,21 to achieve the objectives of avoiding the common‐mode currents and reducing the ripple in the phase current.…”

Online current cut‐off frequency self‐tuning active damping speed controller for permanent magnet synchronous motors

“…Permanent magnet synchronous motors (PMSMs) have the major advantage of removing the mechanical part exciting the rotors, leading to (for hardware) a considerable power factor and efficiency and (for software) control algorithm simplification owing to the absence of flux observers. These advantages have broadened industrial battery-based applications of PMSMs to industries that include electrical vehicles, drones, and personal mobility [1][2][3][4][5].…”