AUTHOR=Wang Qiwei , Zhang Kun , Ma Shaohua , Chen Zhe , Cheng Songqing 

TITLE=Nonlinear transient voltage and frequency-coordinated control strategy for the renewable energy sending system

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 11 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2023.1227940

DOI=10.3389/fenrg.2023.1227940

ISSN=2296-598X

ABSTRACT=In order to ensure that the voltage and frequency of the sending system with a high proportion of renewable energy access under transient port energy impact can be controlled within the allowed fluctuation range, a nonlinear multi-objective transient voltage and frequency coordinated control strategy for the renewable energy sending system is proposed in this paper. Firstly, the dynamic balance characteristics of the renewable energy sending system under transient energy impact are analyzed by establishing the equivalent power source model, and the frequency and voltage state equation of the sending system considering transient energy impact is studied and established. Then, considering the supporting effect of energy storage on the voltage and frequency of the renewable energy sending system, a nonlinear transient frequency and voltage coordinated control model of the renewable energy sending system is proposed. Finally, the above conclusions are verified by simulation analysis. The simulation results show that the proposed control method can realize the voltage and frequency stability control under the transient energy. The effective energy tracking control algorithm can make better utilize the fast energy regulation characteristics of the battery energy storage, which can effectively reduce the fluctuation amplitude of the transmission system and restore the synchronization in a short time. The voltage frequency control algorithm can greatly reduce the amplitude of voltage and frequency fluctuations, and can realize the rapid suppression of voltage and frequency fluctuations.