NDLI: Research on frequency oscillation of HVDC sending system in islanded mode of hydro power units

Content Provider	IEEE Xplore Digital Library
Author	Menglin Zhang Chongru Liu Yurong Han Gengyin Li
Copyright Year	2014
Description	Author affiliation: State Key Lab. for Alternate Electr. Power Syst. with Renewable Energy Source, North China Electr. Power Univ., Beijing, China (Menglin Zhang; Chongru Liu; Yurong Han; Gengyin Li)
Abstract	When large hydro power plants in sending-end of HVDC operate in islanded mode, water pressure pulsation caused by vortex strip in turbine draft tube will result in frequency vibration in islanded system. This paper designs a resonance function to simulate the actual water pressure in turbine draft tube and set up a new hydraulic turbine model considering the draft tube water pressure pulsation as well as the elastic water column, which is a big improvement to the original linear turbine model. At the same time, it gives the pole figure of the new hydraulic pulse function. Then, the accuracy of the turbine model is verified by using time domain method and the effect of the hydro turbine parameters as well as the governor parameters on frequency oscillation of HVDC sending system in islanded mode is also analyzed. Simulation results illustrate that hydraulic startup time $T_{w},$ governor parameter $K_{t},$ $K_{D}$ have greater influence on frequency oscillation in sending-end of islanded DC system. Finally, to avoid reforming the structure of hydraulic turbine, DC frequency is adopted to restrain from frequency oscillation. The simulation results show that the improved DC frequency limiter after the optimization of its parameters cooperated with governor which is also optimized can control the sending frequency at 49.8Hz ~ 50.2Hz.
Starting Page	2394
Ending Page	2400
File Size	922112
Page Count	7
File Format	PDF
ISBN	9781479950324
DOI	10.1109/POWERCON.2014.6993927
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-10-20
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electron tubes Hydraulic turbines Oscillators HVDC transmission Resonant frequency Water Harmonic analysis pressure pulsation of draft tube DC frequency limiter frequency vibration islanded hydroelectric
Content Type	Text
Resource Type	Article

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