In the recent decade, temporary frequency support derived from variable speed wind turbine generator has been drawing increasing attention in the electronic-growing power system. Frequency nadir and rate of change of frequency are two key indicators temporary frequency support strives to improve. This paper proposes a novel insight on frequency regulation of wind power. Note that considerable part of load is shared by synchronous generators and wind turbine generator and the system frequency still will be dominated by the former for a period of time. Simultaneously taking the frequency regulation characteristic of synchronous and power balance into account, a novel frequency regulation scheme aiming at improving system's frequency regulation performance is proposed and tested in a 7-machine power system with an aggregated wind farm on MATLAB/Simulink to investigate what inherently determines the performance of frequency regulation. Results show that with differential cooperation of synchronous generator and doubly fed induction generator, frequency nadir and rate of change of frequency can be partially improved. Particularly, regarding to handling the issue of control delay, an appropriately slower action upon detecting a frequency event may not screw up it but contribute to a higher frequency nadir, which benefits from the spontaneous cooperation of synchronous generator and wind power with constraint of power balance.

中文翻译：

---

变速风能转换系统临时频率支持的新见解

近十年来，来自变速风力涡轮发电机的临时频率支持在电子增长的电力系统中越来越受到关注。频率最低点和频率变化率是临时频率支持努力改善的两个关键指标。本文提出了对风电频率调节的新见解。需要注意的是，相当一部分负荷由同步发电机和风力发电机分担，系统频率在一段时间内仍会以同步发电机为主。同时兼顾同步和功率平衡的调频特性，提出了一种旨在提高系统性能的新型调频方案。在 MATLAB/Simulink 上，在具有聚合风电场的 7 机电力系统中提出并测试了频率调节性能，以研究决定频率调节性能的内在因素。结果表明，通过同步发电机和双馈感应发电机的差分配合，可以部分改善频率最低点和频率变化率。特别是在处理控制延迟问题方面，在检测到频率事件时采取适当较慢的动作可能不会把它搞砸，而是会导致更高的频率最低点，这得益于同步发电机和风力发电在功率平衡约束下的自发合作. 结果表明，通过同步发电机和双馈感应发电机的差分配合，可以部分改善频率最低点和频率变化率。特别是在处理控制延迟问题方面，在检测到频率事件时采取适当较慢的动作可能不会把它搞砸，而是会导致更高的频率最低点，这得益于同步发电机和风力发电在功率平衡约束下的自发合作. 结果表明，通过同步发电机和双馈感应发电机的差分配合，可以部分改善频率最低点和频率变化率。特别是在处理控制延迟问题方面，在检测到频率事件时采取适当较慢的动作可能不会把它搞砸，而是会导致更高的频率最低点，这得益于同步发电机和风力发电在功率平衡约束下的自发合作.