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Overall power control strategy for small-scale WECS incorporating flux weakening operation

机译：包含磁通减弱操作的小型WECS的整体功率控制策略

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摘要

This study presents an overall power control strategy for control of fixed-pitch small-scale wind energy conversion system (WECS). The overall power control strategy is designed in such a way that the WECS efficiently operates for both underrated and overrated wind speeds. At underrated wind speeds, maximum power point tracking is achieved through a proportional-integral (PI) mechanical torque controller while no wind speed sensor is required. The PI mechanical torque controller together with a high-gain observer, estimating mechanical torque, generates the reference electrical torque. At overrated wind speed, the control strategy limits the generated power to rated power of generator via an anti-windup algorithm. In this case, the flux weakening strategy then is invoked. The optimal (reference) flux magnitude is provided by off-line numerically solving an optimisation problem. An space-vector modulation (SVM)-based direct-torque control (DTC) is used to track the electrical torque and flux references. In particular, the SVM-DTC is composed of a reference voltage vector calculator providing a desired voltage vector. The effectiveness of the proposed overall power control strategy is verified by applying the strategy to a commercial 10 kW wind turbine simulated in MATLAB/Simulink.
机译：这项研究提出了一种用于固定螺距小型风能转换系统（WECS）的总体功率控制策略。总体功率控制策略的设计方式使得WECS可以有效地针对低速和高速风速运行。在低速风速下，通过比例积分（PI）机械扭矩控制器可实现最大功率点跟踪，而无需风速传感器。 PI机械扭矩控制器与高增益观测器一起估算机械扭矩，生成参考电扭矩。在超速风速下，控制策略通过反加速算法将发电功率限制为发电机的额定功率。在这种情况下，将调用磁通减弱策略。通过离线数值求解优化问题来提供最佳（参考）磁通量。基于空间矢量调制（SVM）的直接转矩控制（DTC）用于跟踪电转矩和磁通参考值。特别地，SVM-DTC由提供所需电压矢量的参考电压矢量计算器组成。通过将该策略应用于在MATLAB / Simulink中仿真的商用10 kW风力涡轮机，可以验证所提出的总体功率控制策略的有效性。

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