Simulation Platform for the Optimal Configuration of Hybrid Energy Storage Assisting Thermal Power Units in Secondary Frequency Regulation

In response to the issue of determining the appropriate capacity when hybrid energy storage systems (HESS) collaborate with thermal power units (TPU) in the system’s secondary frequency regulation, a configuration method for HESS based on the analysis of frequency regulation demand analysis is proposed. And a corresponding simulation platform is developed. Firstly, a frequency modulation demand method for reducing the frequency modulation losses of TPU is proposed. Secondly, taking into comprehensive consideration that flywheel energy storage features rapid power response and battery energy storage has the characteristic of high energy density, a coordinated control strategy for HESS considering the self-recovery of state of charge (SOC) is put forward. Then, to measure the economic and technical performance of HESS in assisting the secondary frequency modulation of TPU, an optimized configuration model considering the full-life-cycle economy and frequency modulation performance of TPU and HESS system is constructed. Finally, a visual simulation platform for the combined frequency modulation of TPU and HESS is developed based on Matlab Appdesigner. The results of calculation examples indicate that the proposed configuration method can improve the overall economic efficiency and frequency modulation performance of TPU and HESS; The control strategy can not only prolong the service life of battery energy storage but also enhance the continuous response ability of HESS; The visual simulation platform is easy to use, and the simulation results are accurate and reliable.