Analysis and control for ultralow frequency oscillation damping caused by asynchronous networking mode Online publication date: Fri, 10-Mar-2023
by Renqiu Wang; Shangyu Tian; Hongjian Shi; Feiao Li; Yuanyi Kang
International Journal of Modelling, Identification and Control (IJMIC), Vol. 42, No. 2, 2023
Abstract: The ultralow frequency oscillation damping problem caused by asynchronous networking mode is investigated for Chongqing-Hubei asynchronous grid. The negative damping problems offered by governors are investigated. The electromechanical transient model of the voltage source converter (VSC)-high voltage direct current (HVDC) for the Chongqing-Hubei asynchronous grid is constructed. Fault modes that cause ultralow frequency oscillation after VSC-HVDC are analysed by using the Power System Analysis Software Package (PSASP), because faults in asynchronous grid often result in the ultra-low frequency oscillation damping. An additional damping controller of the VSC-HVDC and its small signal model is proposed, and the mechanism of the additional controller which increases the system damping is also analysed. The simulation results show that low frequency oscillation can be effectively suppressed by using the provided controller in this paper.
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