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Copyright of Zhejiang Electric Power is the property of Zhejiang Electric Power Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Wind turbines can contribute to frequency regulation by releasing rotor kinetic energy， which is an effective way to ensure frequency stability in power systems with high wind power penetration. However， the rotor speed recovery process may cause a secondary frequency drop （SFD） in the system. To address this issue， a wind turbine speed recovery strategy based on the asymptotic characteristics of an exponential function is proposed， following both qualitative and quantitative analysis of the frequency support and speed recovery. First， during the recovery period， the rotor speed is restored according to the power reference value defined by an exponential function. After the speed is recovered， the control switches to maximum power point tracking （MPPT） to manage the turbine's output power. Second， the parameters of the exponential decay coefficient are tuned based on various constraints. Finally， simulation results validate that the proposed strategy effectively mitigates SFDs while ensuring a smooth rotor speed recovery process.

Grid-forming （GFM） converters， known for their superior inertia damping characteristics， have emerged as a center research focus in the renewable energy sector. As a result， the damping characteristics of GFM wind power converters are first examined. The analysis centers on their equivalent external characteristics from an impedance standpoint， and the Bode stability criterion is utilized to study their stability during grid connection. Subsequently， the frequency support characteristics of GFM wind power converters are examined in terms of inertia. A comparative investigation is undertaken via simulation analysis to gauge the supportive capability of GFM and grid-following （GFL） wind power converters during alterations in grid frequency and power fluctuation on the wind turbine side. The findings reveal that the external impedance characteristics of GFM wind power converters not only display inductive properties but also maintain commendable stability throughout grid integration. In response to a grid malfunction， GFM wind power converters can furnish a significant measure of power support， equating to a rise in system inertia， thereby indicating favorable grid integration characteristics.

Copyright of Zhejiang Electric Power is the property of Zhejiang Electric Power Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Drive is the property of Electric Drive Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper,the problem of frequency support capability for doubly fed induction generators (DFIGs) in the future grid with high penetration of wind power is discussed, and a frequency stability controller based on maximum power tracking control and differential control is proposed. The relationship between grid frequency and frequency support capability of DFIGs is built, then the influence of the designed controllers on system frequency stability is analyzed. And the power system simulation software DIgSILENT/PowerFactory is used to set up the system simulation experiment platform, the result proves that the proposed frequency stability controller can effectively improve the frequency performance of the whole system. [ABSTRACT FROM AUTHOR]

A method that PV-battery power generation system support the frequency of the grid was provided. The main design method was using fuzzy control to classify the real -time frequency of grid. Taking account of the grid current condition, the actual PV power output under different weather cases and the status of battery, specific operation mode was established. The functionality of providing or absorbing active power from grid was achieved by the cooperation between PV and battery. The feasibility of this simulation design was verified by the system testing. The results show that this design can realize the status transform between the different operation modes and the design has a great capability for supporting grid frequency. [ABSTRACT FROM AUTHOR]