Abstract
Energy storage units is widely used in renewable power systems. For multiple distributed energy storage units, active power and frequency response characteristics can be effectively improved when virtual synchronous control is adopted; However, if the virtual inertia is unevenly distributed, it is not easy to achieve good performance for the dynamic adjustment of active power and system frequency. To solve this problem, resilent active power and virtual inertia coordinated control is proposed in this paper. Firstly, the total virtual inertia for the system can be calculated and analyzed quantitatively through the resilent active power of distributed energy storages. Secondly, the virtual inertia is assigned to each distributed energy storage unit according to the predefined active power ratio, respectively. The proposed resilent active power and virtual inertia coordinated control can improve the dynamic response of the system frequency, effectively reduce the oscillation of the active power, and realize active power sharing for the distributed energy storage units. Finally, the effectiveness and feasibility of the proposed control strategy are verified by Matlab/Simulink simulation results under different scenarios.
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