Abstract
The instability of the primary frequency regulation process of hydroelectric units has led to the occurrence of ultra-low frequency oscillations(ULFO) which frequency is less than 0.1 Hz.It mainly appears in the isolated power grid and direct current delivery system with high proportion of hydropower in recent years.So it is very important to study the influence of the main link parameters of the primary frequency regulation on ULFO including the water inertia time constant, system load frequency regulation coefficient. In this paper, a nonlinear model based on each link of primary frequency regulation process is built, and the oscillation frequency of the system under the influence of different parameters is determined by using a variety of frequency domain analysis methods. The influence of the main parameters on the frequency oscillation of the system is analyzed in detail, including the joint stability region which guarantees the stability of the system under the coupling of the governor parallel PID parameters.Nonlinear link is linearized by the method of description function.A new method to determine the parameter range of each link is proposed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IOP Conference Series: Earth and Environmental Science
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
