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Direct power control for three-level PWM rectifier based on hysteresis strategy

Science China(Technological Sciences) 2012年第11期55卷 3019-3028页

作者： SHI TingNa WANG Jian ZHANG Ce XIA ChangLiang School of Electrical Engineering and Automation Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tianjin Polytechnic UniversityTianjin 300387China

This paper presents a mathematical model of three-level voltage PWM rectifier,and derives a power control model from the theory of instantaneous *** the vector-space,the influences on instantaneous power exercised by all the switching vectors are studied and illustrated separately,then a direct power control(DPC) scheme for three-level PWM rectifier which uses multistage band hysteresis comparator is proposed,and a novel switching table is ***,the neutralpoint voltage unbalance is inhibited by selecting the redundancy switching states of small voltage *** and experimental results show that the proposed strategy can not only stabilize the DC bus voltage but also realize the unity power factor operation and the balance of neutral-point ***,the proposed method can improve the performance of the three-level rectifier.

关键词： direct power control hysteresis control instantaneous power neutral-point voltage balance switching table three-levelPWM rectifier

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Direct torque control of doubly fed induction motor using three-level NPC inverter

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Protection and Control of Modern Power Systems 2019年第1期4卷 208-216页

作者： Najib El Ouanjli Aziz Derouich Abdelaziz El Ghzizal Mohammed Taoussi Youness El Mourabit Khalid Mezioui Badre Bossoufi Laboratory of Production Engineering Energy and Sustainable DevelopmentHigher School of TechnologySidi Mohamed Ben Abdellah UniversityFezMorocco Laboratory of Systems Integration and Advanced Technologies Faculty of Sciences Dhar El MahrazSidi Mohamed Ben Abdellah UniversityFezMorocco Laboratory of Electrical Engineering and Maintenance ESTO School of TechnologyUniversity Mohammed IOujdaMorocco

This article presents the direct torque control (DTC) strategy for the doubly fed induction motor (DFIM) connected to two three-level voltage source inverters (3LVSIs) with neutral point clamped (NPC) structure. This control method allows to reduce the torque and flux ripples as well as to optimize the total harmonic distortion (THD) of motor currents. The use of 3LVSI increases the number of generated voltage, which allows improving the quality of its waveform and thus improves the DTC strategy. The system modeling and control are implemented in Matlab/Simulink environment. The analysis of simulation results shows the better performances of this control, especially in terms of torque and flux behavior, compared to conventional DTC.

关键词： Direct torque control Doubly fed induction motor Three-level inverter Ripples switching table

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A Study of DTC-Power Electronic Cascade Fed by Photovoltaic Cell-Three-Level NPC Inverter

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Smart Grid and Renewable Energy 2010年第3期1卷 109-118页

作者： Iqbal Messaif El-Madjid Berkouk Nadia Saadia Instrumentation Laboratory Houari Boumediene University of Science and TechnologyAlgiersAlgeria Electrical Engineering Department Polytechnic National SchoolHassen BadiAlgiersAlgeria Robotics Laboratory Houari Boumediene University of Science and TechnologyAlgiersAlgeria

This paper proposes a high performance three-level inverter Neutral Point Clamped (NPC) structure for photovoltaic system. The proposed configuration which can boost the low voltage of photovoltaic (PV) array, can also convert the photovoltaic DC power into high quality AC power. Attention has been paid to the problem of neutral point potential variation. In this way, a Direct Torque Control (DTC) technique has been applied and the estimated value of the Neutral Point Potential (NPP) is used, which is calculated by motor currents. This control strategy uses the redundancy presented by the inverter for selecting appropriate switching state through a switching table to achieve the control of NPP. This study shows the effect of the stability problem of the DC voltages and good static and dynamic performances were obtained in simulation of the proposed cascade “photovoltaic cell-three-level NPC VSI-induction motor”.

关键词： DTC switching table NPC Three-Level Inverter Photovoltaic Neutral Point Potential Redundant States

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