FAN Chengwei,CHEN Gang,SHI Huabo,et al.Analysis of Multi-deadband Link Influence on Frequency Oscillation Based on Unified Frequency Response Model[J].Automation of Electric Power Systems,2020,44(18):164-171.
FAN Chengwei,CHEN Gang,SHI Huabo,et al.Analysis of Multi-deadband Link Influence on Frequency Oscillation Based on Unified Frequency Response Model[J].Automation of Electric Power Systems,2020,44(18):164-171. DOI: 10.7500/AEPS20200119002.
Analysis of Multi-deadband Link Influence on Frequency Oscillation Based on Unified Frequency Response Model
Frequency oscillation in power system is one of the most concerned frequency stability problems in recent years. The influence of governor deadband on frequency oscillation cannot be neglected. However
the current research methods can only be used to analyze single deadband link
which lacks of the analysis methods of the multi-deadband system. To solve this problem
according to the principle of description function method
this paper defines the extended description function which is applied to nonlinear composite system
and the extended description function can quantify the relationship of input and output of a system with multiple nonlinear links. Then
based on the unified frequency model of multiple governors
the turbines and governors of hydro and thermal power units with different deadbands are equivalently modelled as a single extended description function. On the complex plane
trajectories of minus reciprocal for the extended description function changing with amplitude and the Nyquist curves of generators are combined to analyze the system stability. Finally
according to the conditions of the intersection of two curves
the critical oscillation amplitude of disturbances to trigger the system frequency oscillation is calculated. The proposed method can quantitatively analyze the influence of multi-deadband link on the frequency oscillation. The simulation of an actual power grid verifies the effectiveness of using deadband configuration to suppress the ultra-low frequency oscillation.
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