基于滑模观测器的NPC变流器直驱PMSG风力发电系统位置自感知控制

Na Huang, Jiangbiao He, N. Demerdash
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引用次数: 15

摘要

在变速风能转换系统中,转子位置和转速信息起着至关重要的作用。传统的基于传感器的位置检测方法不仅增加了硬件复杂度和系统成本,而且由于风力发电现场多变天气和恶劣运行条件的干扰,对可靠性提出了严峻的挑战。因此,为了消除位置传感器,发展可靠的位置自感知技术,本文提出了一种基于滑模观测器的2 MW永磁同步发电机(PMSG)风力发电系统位置自感知控制方法。此外,开发了一种空间矢量脉宽调制(SVPWM)的三电平中性点箝位背对背变换器,用于满量程功率转换,与传统的两电平变换器相比,该变换器对开关器件的电压应力更小,输出电压谐波失真更小。仿真分析验证了所提出的自感知方法和基于三电平SVPWM的背靠背NPC变换器的有效性。仿真结果充分证明了所提出的控制方案和功率转换策略的可行性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sliding mode observer based position self-sensing control of a direct-drive PMSG wind turbine system fed by NPC converters
Information of rotor position and speed plays an crucial role in variable-speed wind energy conversion systems. Traditional sensors based position detection methods not only increase hardware complexity and system cost, but also face severe challenges on reliability caused by the disturbances from the varying weather and harsh operating conditions in wind energy generation sites. Thus, with the aim of eliminating position sensors and developing a reliable position self-sensing technique, this paper proposes a position self-sensing control method based on sliding mode observer for a 2 MW permanent magnet synchronous generator (PMSG) wind turbine system. In addition, a three-level neutral-point-clamped (NPC) back-to-back converter with space vector pulse width modulation (SVPWM) is developed for the full-scale power conversion, which has lower voltage stress on the switching devices and less harmonic distortion in the output voltage compared with those in traditional two-level power converters. Simulation analysis is carried out to verify the effectiveness of the proposed self-sensing method and the three-level SVPWM based back-to-back NPC converter. The simulation results soundly justified the feasibility of the proposed control scheme and power conversion strategy.
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