A two-stage hybrid energy storage optimal configuration method considering system reliability
Due to the large randomness and fluctuation of new energy output,it has become the current develop-ment trend to configure energy storage to smooth out the fluctuation of new energy.At present,the researches relat-ed to energy storage planning rarely considering the random fault events of the system,which may lead to the diffi-culty of the energy storage device to achieve the expected effect when the fault occurs.To solve the above prob-lems,this paper proposes a two-stage hybrid energy storage configuration method oriented to system reliability.Firstly,typical operating scenarios are obtained based on clustering method,and then reliability tracking method based on Shapley value is used to identify the weak links of the system,from which high-risk equipment and severe failure scenarios of the system under different operating scenarios are analyzed.Then,an optimization model aiming at minimizing the investment cost and considering the operation cost of reliability is established to obtain a hybrid energy storage configuration scheme suitable for multiple failure scenarios,which can significantly improve the sys-tem's ability to resist risks while ensuring the absorption of new energy.Finally,a numerical example based on IEEE-RTS24-node test system verifies the effectiveness of the proposed two-stage energy storage optimization config-uration method.
hybrid energy storage optimization configurationreliabilityweak link identification