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Power Limitation Control for a PMSG-Based Marine Current Turbine at High Tidal Speed and Strong Sea State

机译:基于PMSG的高潮流和强海洋状态下的船用水轮机的功率限制控制

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摘要

This paper deals with the control strategies for a fixed-pitch marine current turbine (MCT) when the marine current speed exceeds the rated value corresponding to the rated power of generator and converter. Over-rated marine currents occur at large spring tides or under strong sea states; in these cases maximum power point tracking (MPPT) strategies must be changed to power limitation strategies for limiting the generator power at rated value. In this paper, two power limitation strategies with flux-weakening control are investigated. A feedback flux-weakening control is applied to extend the rotor speed operating range over the nominal MPPT tracking speed during high speed marine currents. In the speed control strategy, the turbine power characteristics are used to generate the rotor speed reference and the power limitation can be obtained at steady-state. In the torque control strategy, the generator torque is directly calculated by the power limitation and the rotor speed; this method enables to control the generator power at the limited value at dynamic process. Both strategies are investigated and compared at high tidal speeds without and with swell effect.
机译:本文研究了当海洋电流速度超过与发电机和变流器的额定功率相对应的额定值时,固定螺距海洋电流涡轮机(MCT)的控制策略。过大的洋流发生在春季大潮或强海状态下。在这些情况下,必须将最大功率点跟踪(MPPT)策略更改为功率限制策略,以将发电机功率限制在额定值。本文研究了两种具有弱磁通控制的功率限制策略。施加反馈磁通弱化控制可在高速海流期间将转子速度工作范围扩展到MPPT额定跟踪速度之上。在速度控制策略中,涡轮功率特性用于生成转子速度参考值,并且可以在稳态下获得功率限制。在转矩控制策略中,发电机转矩直接由功率限制和转子速度来计算;这种方法可以在动态过程中将发电机功率控制在极限值。对这两种策略进行了研究,并在没有潮汐效应和有潮汐效应的高潮速下进行了比较。

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