This study proposes a deep learning-based SSVEP classification model, ConvFormer, aiming to enhance the performance of brain-computer interface (BCI) systems. The model combines a global Fourier transform encoder and ...
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The different wiring methods of the induction winding have a significant impact on the equivalent circuit parameters of the transformer winding, that is, the oscillation wave curve will undergo significant changes und...
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In this paper, an online search method for the maximum efficiency operating point of a synchronous reluctance motor (SynRM) based on virtual signal injection is proposed. The SynRM and the inverter are modeled as a wh...
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Solar narrowband irradiance data, although necessary in solar energy engineering and applications, are scarce due to its high-cost measurement. To obtain such data indirectly, building models with machine learning (ML...
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In response to the demand for high DC bus voltages in electric drive systems, this paper proposes a topology with a high step-up ratio. This topology enables a low-voltage DC source to generate a high DC bus voltage. ...
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A three-phase to single-phase modular multilevel converter based advanced co-phase traction power supply(MMC-ACTPS) system is an effective structure to address the concerns of phase splitting and poor power quality of...
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A three-phase to single-phase modular multilevel converter based advanced co-phase traction power supply(MMC-ACTPS) system is an effective structure to address the concerns of phase splitting and poor power quality of the conventional electrified railway. Due to the large number of MMCACTPS system modules, I/O resources and computing speed have high requirements on processors. Moreover, the module capacitor balance is challenging because the sorting time is too long when the traditional sorting algorithm for voltage balance is used. To solve the above issues, a digital implementation scheme of flexible power control strategy for three-phase to single-phase MMC-ACTPS system based on field programmable gate array(FPGA), which has sufficient I/O resources, has been proposed. Due to the parallel execution characteristics of the FPGA, the execution time of the controller and the modulator can be greatly reduced compared with a digital signal processor(DSP) + FPGA or DSpace. In addition, an improved sorting algorithm is proposed to reduce the sorting time and the implementation steps are analyzed. Finally, simulation and experimental results are presented to demonstrate the effectiveness and correctness of the proposed control strategy.
Power electronic converters under weak grid conditions may trigger new dynamic stability *** though massive internal and external damping methods have been investigated,their system costs and robustness have not been ...
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Power electronic converters under weak grid conditions may trigger new dynamic stability *** though massive internal and external damping methods have been investigated,their system costs and robustness have not been solved in an effective *** paper first proposes a sensorless active damping method based on the grid current feedback *** mid-frequency non-passive region of converters can be reduced effectively,thus system stability improvement in weak grids can be *** this paper analyzes the feedback filter which may bring about additional non-passive regions in high ***’s more,it has a poor *** residual mid-frequency non-passive region can be enlarged under converter parameter ***,this paper proposes a hybrid active damping *** grid voltage is fed forward through a low pass *** robustness against parameter variation is greatly improved and the non-passive region in high frequency is also totally *** order to further improve the system robustness in high frequency,a simple passive damping is also *** damping resistor is designed small to reduce the damping *** simulation and experimental results prove that the proposed sensorless method can realize robust damping in an economic way.
In response to the problem of high amplitude common mode voltage (CMV) in the third harmonic injection two-stage matrix converter (3TSMC), the CMV suppression methods of active zero state PWM (AZSPWM) and near-state P...
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Permanent magnet synchronous motors(PMSMs)are widely used in high-power-density and flexible control ***,the inductance changes significantly in real-time machine operations because of magnetic saturation and coupling...
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Permanent magnet synchronous motors(PMSMs)are widely used in high-power-density and flexible control ***,the inductance changes significantly in real-time machine operations because of magnetic saturation and coupling ***,the identification of inductance is crucial for PMSM *** inductance identification methods are primarily based on the voltage source inverter(VSI),making inverter nonlinearity one of the main error sources in inductance *** improve the accuracy of inductance identification,it is necessary to compensate for the inverter nonlinearity *** this study,an overview of the PMSM inductance identification and the related inverter nonlinearity self-learning methods are presented.
Large-scale grid-connection of new energy generators requires reliable grid synchronization signals, while phase-locked loop (PLL) technology is a universal method to detect these signals from the power grid due to it...
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