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Repetitive Control With Adaptive Sampling Frequency for Wind Power Generation Systems

机译：风力发电系统中具有自适应采样频率的重复控制

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摘要

This paper presents a novel repetitive control (RC) for wind power generation systems (WPGS), which achieves optimal performance in steady-state conditions due to a variable sampling/switching period technique (VSPT). The main objective of VSPT is to obtain an integer number of samples per grid period, which solves the main problem of RC, i.e., the loss of rejection to periodic disturbances due to grid frequency drift. The sampling/switching frequency is adjusted with a variable sampling period filter phase-locked loop, which also adds robustness to the system due to its inherent tolerance to grid voltage distortion and unbalances, and events such as frequency steps and faults. The control and synchronism subsystems are described, designed, and verified experimentally in a 10-kW WPGS. The results obtained prove the accuracy of the proposed control even under severe disturbances, typical in grids with high WPGS penetration, providing ancillary functions to enhance reliability and reduce operational costs.
机译：本文提出了一种用于风力发电系统（WPGS）的新型重复控制（RC），由于可变采样/切换周期技术（VSPT），该系统在稳态条件下可实现最佳性能。 VSPT的主要目标是获得每个网格周期的整数个样本，从而解决了RC的主要问题，即，由于网格频率漂移而导致的对周期性干扰的抑制损失。采样/开关频率通过可变采样周期滤波器锁相环进行调节，由于其对电网电压失真和不平衡的固有耐受力以及诸如频率阶跃和故障之类的事件，它还为系统增加了鲁棒性。描述和设计了10 kW WPGS的控制和同步子系统，并进行了实验验证。所获得的结果证明了即使在严重扰动下所提出的控制的准确性，这在具有较高WPGS穿透力的电网中也很常见，并提供辅助功能以增强可靠性并降低运营成本。

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