ZHANG Hongli,LIU Fusuo,LI Wei.Online Control Method for Transient Safety and Stability of Large-scale Power Grid Considering Short-term Fluctuations of Renewable Energy[J].Automation of Electric Power Systems,2023,47(20):166-173.
ZHANG Hongli,LIU Fusuo,LI Wei.Online Control Method for Transient Safety and Stability of Large-scale Power Grid Considering Short-term Fluctuations of Renewable Energy[J].Automation of Electric Power Systems,2023,47(20):166-173. DOI: 10.7500/AEPS20220628002.
Online Control Method for Transient Safety and Stability of Large-scale Power Grid Considering Short-term Fluctuations of Renewable Energy
With the large-scale grid connection of renewable energy
the time-varying characteristics of operation modes are enhanced
which puts forward new requirements for online emergency control strategy. First
based on the extended equal area criterion
the influence of inertia ratio and fault crossing characteristics of renewable energy on equivalent generator trajectory after short-term fluctuation of renewable energy is analyzed
and the worst scenario of the influence of short-term fluctuation of renewable energy on control is given. Then
the formula for calculating the sudden change of electromagnetic power of equivalent generator at the emergency control time in the worst scenario is derived
and the emergency control critical quantity is quickly obtained. Finally
the method of matching the corresponding control strategy according to the actual operation mode word after the fault occurence is developed. The simulation results verify the accuracy and effectiveness of the proposed method and it can reduce the under-control risk of online emergency control in the short-term fluctuation scenario of renewable energy.
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