Self-synchronising stator terminal control of permanent magnet synchronous generators for wind energy conversion systems

R. Davoodnezhad, D. G. Holmes, B. Mcgrath, A. Vahidnia
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引用次数: 3

Abstract

Conventional wind energy conversion systems (WECS) typically employ rotor side synchronous frame current control strategies to regulate the active/reactive power supplied by the WECS generator. Such strategies require accurate information regarding the rotor position and speed in order to set the dq frame reference currents and to perform the necessary frame transformations. This information can be obtained using a rotor speed sensor (i.e. a shaft encoder) or via a sensor-less strategy in which a dynamic machine model and stator current measurements are used to estimate the true rotor position. This paper now presents an alternative approach to control the active/reactive power supplied by the WECS permanent magnet synchronous generator (PMSG). The proposed strategy uses the three phase converter modulation commands to identify the phase and frequency of the PMSG stator terminal voltages. This enables the direct regulation of the real and reactive power extracted at the PMSG terminal voltages using a stationary frame Proportional + Resonant (PR) stator current regulation strategy, without requiring precise knowledge of the rotor position. Maximum power point tracking (MPPT) functions are realized using the measured PMSG terminal voltage frequency to form an estimate of the rotor speed. The result is a simple robust WECS control strategy that rapidly and accurately tracks rotor speed changes caused by wind speed variations. Detailed simulation and experimental results obtained for a scaled laboratory prototype system are presented to validate the proposed strategy.
风能转换系统永磁同步发电机定子自同步终端控制
传统的风能转换系统(WECS)通常采用转子侧同步机架电流控制策略来调节WECS发电机提供的有功/无功功率。这种策略需要关于转子位置和速度的准确信息,以便设置dq帧参考电流并执行必要的帧转换。该信息可以通过转子转速传感器(即轴编码器)或通过无传感器策略获得,其中动态机器模型和定子电流测量用于估计转子的真实位置。本文提出了一种控制WECS永磁同步发电机(PMSG)提供的有功/无功功率的方法。该策略使用三相变换器调制命令来识别PMSG定子端电压的相位和频率。这使得使用固定框架比例谐振(PR)定子电流调节策略直接调节在PMSG终端电压提取的实际和无功功率,而无需精确了解转子位置。最大功率点跟踪(MPPT)功能是利用测量的PMSG端子电压频率来形成转子转速的估计。结果是一种简单的鲁棒wcs控制策略,可以快速准确地跟踪风速变化引起的转子速度变化。为验证所提出的策略,给出了一个规模实验室原型系统的详细仿真和实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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