Abstract
With the development of market-oriented reformation, integrated energy system with high proportion of new energy installed capacity are gradually facing the pressure of power fluctuation stabilizing. This paper exploits the weak equilibrium characteristic of thermal system to solve high frequency fluctuation of new energy sources. It establishes a multi-frequency stable operation optimization model of integrated energy system considering the virtual energy storage characteristics of thermal network. Firstly, the model exploits the wavelet packet decomposition method for the frequency decomposition of the fluctuation stabilizing demand faced by the integrated energy system. Secondly, this study investigates the technical characteristics of source-load-storage equipment regulation and heat network temperature-quantity regulation in the thermal system. Finally, considering the equipment life and system fluctuation smoothing needs, an integrated energy system stability optimization model is established. Meanwhile, a modified honey badger algorithm is proposed to realize the case optimization simulation.The result shows that the total operating cost of the system is reduced by 8.45%. As the thermal system regulation replaces the high-frequency regulation function of the energy storage equipment, the service life of battery increased by 67.6%. Therefore, the model effectively solves the integrated energy system fluctuation stability problem with high proportion of new energy installed capacity.
Published Version
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