Control Strategy of Thermal Power Plant-Energy Storage Integrated System Participating in Secondary Frequency Regulation

The integration of renewable energy sources (RES) such as wind power and photovoltaic have helped to alleviate the problems of energy shortage and environmental pollution. However, it has also presented new challenges to the frequency regulation of the power grid, raising higher requirements on the frequency regulation capability of existing thermal power plants (TPPs). To ensure that TPPs can better accomplish their mission of frequency regulation, this paper proposes a cooperative control method for integrated thermal power plants-energy storage system (TPP-ESS) based on combustion rate feedback. This method significantly improves the effect of TPPs when they participate in secondary frequency regulation by utilizing the rapid response capability of ESS. Furthermore, an active recovery strategy for the state of charge (SOC) is proposed to recover SOC of ESS when needed by using TPPs. Finally, simulations in MATLAB/Simulink are conducted to validate the proposed strategy's effectiveness.