Research on Subsynchronous Oscillation in 750 kV Qinghai Grid of China

Ning DU, Rui-hua SONG, Ya-nan HAN, Pei-peng ZHOU, Hong-xia LI, Miao MIAO, Sheng-yi WEN, Xiang-cheng ZHANG, Xin TAO

Abstract


The series compensation project is under construction for Riyueshan-Haixi-Chaidamu 750kV lines in Qinghai grid. Chaidamu station is the sending end of Qinghai-Tibet HVDC project, which has been be put into operation. According to planning, there will be a large-scale coal-fired plant near Chaidamu station. The transmission system includes AC series compensators and HVDC, and subsynchronous oscillation may take place. In this paper, the subsynchronous oscillation risk was analyzed using frequency scanning, unit interaction factor and time domain simulation. Research results indicate that subsynchronous oscillation may take place under conditions when several AC lines quit and under HVDC island condition.

Keywords


Coal-fired plant, Series compensation, HVDC, Subsynchronous resonance, Subsynchronous oscillation


DOI
10.12783/dtetr/amee2018/25321

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