Abstract
In the scope of this work, a new structure of the direct torque control (DTC) technique scheme of permanent magnet synchronous motors (PMSMs) is proposed using a seven-level neutral point clamped (NPC) inverter and artificial neural networks (ANNs) controllers. This intelligent strategy was used to replace, on the one hand the integral proportional (PI) speed controller, on the other hand and the traditional switching table in order to reduce total harmonic distortion (THD) of voltage/current, stator flux ripple and electromagnetic torque ripples. The modeling and simulation of the proposed control scheme were carried out in Matlab/Simulink environment. The simulation results show that the proposed strategy scheme reduced harmonic distortion of stator voltage/current, stator flux and electromagnetic torque ripples compared to traditional DTC control scheme, DTC control scheme with space vector pulse width modulation (SVPWM) and three-level DTC control scheme. It was found that the stator current waveform becomes purely sinusoidal with a reduction in the harmonic distortion rate to 11.77%.
Highlights
permanent magnet synchronous motors (PMSMs) for Permanent Magnet Synchronous Motors are one of the most proper and efficient motors in electricity industry. these motors are good candidate for applications such as naval and space systems, electric vehicles and etc.The most important advantages of such motors are: high efficiency and power density, low loss, low maintenance cost, easy construction and etc [1]
We propose a new direct torque control (DTC) control scheme based on artificial neural networks (ANNs) method of a PMSM fed by seven-level inverter
PMSM are compared with traditional DTC (DTC-2N)
Summary
PMSMs for Permanent Magnet Synchronous Motors are one of the most proper and efficient motors in electricity industry. these motors are good candidate for applications such as naval and space systems, electric vehicles and etc. The DTC strategy has been introduced in the 1980s by Noguchi and Takahashi as an alternative to FOC control, with the two ofold objective of simplifying the control algorithms and achieving similar or even better performances [6]. In this strategy, two hysteresis comparators, namely flux and torque controllers are selected to determine the inverter instantaneous switching state. A four-level DTC control with ANN is proposed to regulate the stator flux and electromagnetic torque of the IM drives [12]. We propose a new DTC control scheme based on ANN method of a PMSM fed by seven-level inverter.
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