Optimal Capacity Allocation of Renewable Energy Generation Base for Small Signal Stability Improvement

The large-scale integration of renewable energy resources such as wind and solar is challenging the operation of AC power girds due to the dynamic characteristics of power electronic devices (PEDs). Especially when AC grids are weak, improper capacity planning in a renewable energy generation base, which is by nature a multi-infeed power electronic system (MIPES), may lead to potential dynamic stability issues such as small signal instability. Therefore, the allocation of the total grid-connected renewable generation capacity among feeding points in a MIPES plays a significant role in managing the risk of instability issues. In this paper, a method is proposed to optimally allocate the given total grid-connected renewable capacity at each feeding point in a MIPES in order to maximize the small signal stability margin. The proposed method is finally validated via both eigenvalue analysis and time-domain simulations.