特低頻 （英語： ULF, Ultra Low Frequency）是指由 國際電信聯盟 定義的 頻帶 由300Hz到3000Hz的 無線電波， 波長 為1,000km至100km。 [1] 特低頻可以在 磁層 發現到，這些波是 …

This study analyzes the mechanism of ULFO by taking into consideration of a variety of factors including the speed governor model, hydraulic turbine model, generator model, excitation …

This paper analyses the characteristics of the ULFO during the latest seven years in the Nordic power system. The paper shows, based on measurements, that the ULFO has a relationship …

2023年6月1日 · Ultra-low frequency oscillation (ULFO) refers to the oscillation with an extremely low oscillation frequency frequencies, which is monitored more than once in the actual project …

2024年3月1日 · Currently, three primary methods can be used to suppress ULFO: DC additional frequency control, retrofitting or improving power system stabilizers (PSSs), and optimizing …

In this paper, the mechanism of ultra-low frequency oscillation (ULFO) is studied according to the damping torque theory and the influence of proportional, integral and differential parts (PID) …

2020年10月27日 · One of the prominent problems faced with hydro-dominant power system is ultra-low-frequency oscillation (ULFO) with a frequency deviation of 0.1 Hz lower, which is …

2024年2月2日 · Aiming at the problem of ultra-low-frequency oscillation (ULFO) caused by an irrational setting of governor parameters of high-head hydraulic turbine units, this paper …

2021年1月20日 · In recent years, ultra-low-frequency oscillation (ULFO) has reappeared in the Chinese power system. Although the ULFO is not well known compared to classical low …

2019年1月1日 · Yunnan Grid, a hydro-dominated system, has experienced many times ultra-low frequency oscillations (ULFO) since the grid is connected to the China Southern Grid via DC …