Regional Inertia in the Taiwanese Power System after the Installment of Renewable Energy Infrastructure and Suggested Improvements

This study simulated the addition of a PV infrastructure with 20GW of power to the Taiwanese power system in accordance with the government’s renewable energy policy for 2025. Given these varying PV generation and conversion efficiencies in the summer and winter seasons, this study simulated a PV infrastructure parallel to the power grid to investigate whether the voltage variation, three-phase shortcircuit current, and transient stability of the power system meet the requirements of the Taiwan Power Company Renewable Energy Generation System Parallel Technical Guidelines and the Taiwan Power Company Distribution System Planning Guidelines. Compared with the inertia of traditional generators, the inertia of renewable energy is considerably lower. In particular, the generation of PV power does not involve an electromagnetic rotating machine and thus does not provide inertia support. During generator tripping events, the reduction of system inertia and frequency response may affect the stability of the power system. Therefore, in this study, an example case of a traditional generator tripping event was simulated, and the regional inertia of the power system was calculated. Depending on the resulting reduction in system inertia and its effect on system stability, countermeasures were proposed to install power storage systems in areas with relatively low inertia in northern, central, and southern Taiwan. Finally, a PV power generator tripping simulation was again conducted to verify whether the installation of these power storage systems provided sufficient inertia to maintain the real-time stability and safety of the power system.