Abstract
Three-phase permanent-magnet synchronous motors (PMSMs) are widely used in renewable energy applications such as wind power generation, tidal energy and electric vehicles owing to their merits such as high efficiency, high precision and high reliability. To reduce the cost and volume of the drive system, techniques of reconstructing three-phase current using a single current sensor have been reported for three-phase alternating current (AC) control system using the power converts. In existing studies, the reconstruction precision is largely influenced by reconstructing dead zones on the Space Vector Pulse Width Modulation (SVPWM) plane, which requires other algorithms to compensate either by modifying PWM modulation or by phase-shifting of the PWM signal. In this paper, a novel extended phase current reconstruction approach for PMSM drive is proposed. Six novel installation positions are obtained by analyzing the sampling results of the current paths between each two power switches. By arranging the single current sensor at these positions, the single current sensor is sampled during zero voltage vectors (ZVV) without modifying the PWM signals. This proposed method can reconstruct the three-phase currents without any complex algorithms and is available in the sector boundary region and low modulation region. Finally, this method is validated by experiments.
Highlights
Environmental concern is promoting the utilization of renewable and clean energy, which has largely developed electrical energy [1,2,3,4]
Based on the ZVVSM, this paper proposes an extended single current sensor technique used in the three-phase permanent-magnet synchronous motors (PMSMs) drive due to the fact that the installation position of the single current sensor in [34] is not a unique way to realize the phase current reconstruction
Different from the previous methods, this paper proposes a phase current reconstruction method for a three-phase PMSM drive which uses the current paths between each two power switches and samples the sum currents
Summary
Environmental concern is promoting the utilization of renewable and clean energy, which has largely developed electrical energy [1,2,3,4]. Power converters for electrical energy conversion have been widely used in the renewable energy applications such as motor control, electric vehicle, energy storage, high-power-factor rectifiers, and compensators for reactive and harmonic currents to the grid [5,6,7,8,9,10,11,12,13,14,15]. In these systems, at least two current sensors are employed to implement the closed-loop current control and overcurrent protection.
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