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Dynamic Droop–Based Inertial Control of a Doubly-Fed Induction Generator

机译：双馈感应发电机基于动态下垂的惯性控制

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摘要

If a large disturbance occurs in a power grid, two auxiliary loops for the inertial control of a wind turbine generator have been used: droop loop and rate of change of frequency (ROCOF) loop. Because their gains are fixed, difficulties arise in determining them suitable for all grid and wind conditions. This paper proposes a dynamic droop-based inertial control scheme of a doubly-fed induction generator (DFIG). The scheme aims to improve the frequency nadir (FN) and ensure stable operation of a DFIG. To achieve the first goal, the scheme uses a droop loop, but it dynamically changes its gain based on the ROCOF to release a large amount of kinetic energy during the initial stage of a disturbance. To do this, a shaping function that relates the droop to the ROCOF is used. To achieve the second goal, different shaping functions, which depend on rotor speeds, are used to give a large contribution in high wind conditions and prevent over-deceleration in low wind conditions during inertial control. The performance of the proposed scheme was investigated under various wind conditions using an EMTP-RV simulator. The results indicate that the scheme improves the FN and ensures stable operation of a DFIG.
机译：如果在电网中发生大的干扰，则已使用两个辅助回路来对风力涡轮发电机进行惯性控制：下垂回路和频率变化率（ROCOF）回路。由于它们的增益是固定的，因此在确定它们适合所有电网和风力条件时会遇到困难。本文提出了一种双馈感应发电机（DFIG）的基于动态下垂的惯性控制方案。该方案旨在提高频率最低点（FN）并确保DFIG的稳定运行。为了实现第一个目标，该方案使用了下垂环路，但它会基于ROCOF动态更改其增益，以在干扰的初始阶段释放大量动能。为此，使用了将下垂与ROCOF相关联的整形功能。为了达到第二个目标，在惯性控制中，根据转子转速使用不同的整形功能，可以在强风条件下发挥很大作用，并在低风条件下防止过减速。使用EMTP-RV模拟器在各种风况下研究了所提出方案的性能。结果表明，该方案改善了FN，并确保了DFIG的稳定运行。

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